-- development/tests/test-keymaps.lua — driven by development/tests/test-keymaps.sh.
--
-- Headless Neovim harness for the buffer-local keymaps registered by
-- `ftplugin/vimwiki.vim` + `lua/nuwiki/keymaps.lua`. Each case sets up
-- the buffer, places the cursor, fires the key sequence via
-- `nvim_feedkeys`, waits for any LSP round-trip, and asserts the
-- expected post-state.
--
-- Pass/fail summary is written to the path passed as argv[1] so the
-- shell wrapper can read + render it without trying to capture nvim's
-- TUI output.

local OUT = vim.env.NUWIKI_KEYMAP_RESULTS or '/tmp/nuwiki-keymap-results.txt'
local out_lines = {}
local pass = 0
local fail = 0

local function record(ok, name, detail)
  local suffix = (detail and detail ~= '') and (' — ' .. detail) or ''
  table.insert(out_lines, (ok and 'PASS' or 'FAIL') .. ' ' .. name .. suffix)
  if ok then pass = pass + 1 else fail = fail + 1 end
end

local function set_buf(lines)
  vim.api.nvim_buf_set_lines(0, 0, -1, false, lines)
end

local function get_lines()
  return vim.api.nvim_buf_get_lines(0, 0, -1, false)
end

local function get_line(n)
  return vim.api.nvim_buf_get_lines(0, n - 1, n, false)[1] or ''
end

local function send(keys)
  vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes(keys, true, false, true), 'x', false)
end

local function sleep(ms)
  vim.cmd('sleep ' .. ms .. 'm')
end

--- Run one case: lines + cursor (1-based) + key sequence + expected
--- post-state. `wait_ms` defaults to 800 (enough for an LSP
--- executeCommand round-trip on a hot server).
local function run(name, opts)
  local ok, err = pcall(function()
    set_buf(opts.lines)
    vim.api.nvim_win_set_cursor(0, opts.cursor or { 1, 0 })
    send(opts.keys)
    sleep(opts.wait_ms or 800)
    local actual_lines = get_lines()
    if opts.expect_lines then
      if not vim.deep_equal(actual_lines, opts.expect_lines) then
        error(string.format('lines mismatch\n  expected: %s\n  actual:   %s',
          vim.inspect(opts.expect_lines), vim.inspect(actual_lines)))
      end
    end
    if opts.expect_line and opts.expect_at then
      local got = get_line(opts.expect_at)
      if got ~= opts.expect_line then
        error(string.format('line %d mismatch\n  expected: %q\n  actual:   %q',
          opts.expect_at, opts.expect_line, got))
      end
    end
    if opts.expect_cursor_line then
      local lnum = vim.api.nvim_win_get_cursor(0)[1]
      if lnum ~= opts.expect_cursor_line then
        error(string.format('cursor line mismatch — expected %d, got %d',
          opts.expect_cursor_line, lnum))
      end
    end
    if opts.expect_buf_path then
      local got = vim.api.nvim_buf_get_name(0)
      if not got:find(opts.expect_buf_path, 1, true) then
        error(string.format('buffer path mismatch\n  expected substring: %q\n  actual: %q',
          opts.expect_buf_path, got))
      end
    end
  end)
  record(ok, name, ok and '' or tostring(err))
end

local function get_lsp_clients(opts)
  local fn = vim.lsp.get_clients or vim.lsp.get_active_clients
  if not fn then return {} end
  return fn(opts)
end

local function wait_for_lsp(timeout_ms)
  local deadline = vim.loop.now() + (timeout_ms or 5000)
  while vim.loop.now() < deadline do
    local clients = get_lsp_clients({ name = 'nuwiki', bufnr = 0 })
    if #clients > 0 and clients[1].server_capabilities
        and clients[1].server_capabilities.executeCommandProvider then
      return clients[1]
    end
    sleep(100)
  end
  return nil
end

-- ===== Capture server log_message events =====
local server_log = {}
local orig_handler = vim.lsp.handlers['window/logMessage']
vim.lsp.handlers['window/logMessage'] = function(err, result, ctx, cfg)
  if result and result.message then
    table.insert(server_log, '[' .. tostring(result.type) .. '] ' .. result.message)
  end
  if orig_handler then return orig_handler(err, result, ctx, cfg) end
end

-- ===== Smoke: LSP attached =====

vim.defer_fn(function()
  local client = wait_for_lsp()
  if not client then
    record(false, 'lsp.attached', 'no nuwiki client after 5s')
    vim.fn.writefile(out_lines, OUT)
    vim.cmd('qall!')
    return
  end
  record(true, 'lsp.attached', 'client=' .. client.name)

  -- ===== Documented command surface =====
  -- Every command must be reachable in BOTH the canonical :Nuwiki* form
  -- and the vimwiki-compatible :Vimwiki* form. The suffixes below are the
  -- command list minus the prefix. :NuwikiInstall is the one exception — a
  -- nuwiki-only maintenance command with no :Vimwiki* alias.
  local both_forms = {
    'Index', 'TabIndex', 'UISelect', 'Goto', 'FollowLink', 'Backlinks',
    'SplitLink', 'VSplitLink', 'TabnewLink', 'TabDropLink', 'GoBackLink',
    'NextLink', 'PrevLink', 'BaddLink', 'RenameFile', 'DeleteFile',
    'MakeDiaryNote', 'TabMakeDiaryNote', 'MakeYesterdayDiaryNote',
    'MakeTomorrowDiaryNote',
    'DiaryIndex', 'DiaryGenerateLinks', 'DiaryNextDay', 'DiaryPrevDay',
    'TOC', 'GenerateLinks', 'CheckLinks', 'SearchTags', 'GenerateTagLinks',
    'RebuildTags', '2HTML', '2HTMLBrowse', 'All2HTML', 'Rss',
    'NormalizeLink', 'RenumberList', 'RenumberAllLists',
    'ListToggle', 'IncrementListItem', 'DecrementListItem',
    'CatUrl', 'ShowVersion',
  }
  for _, suffix in ipairs(both_forms) do
    for _, prefix in ipairs({ 'Nuwiki', 'Vimwiki' }) do
      local cmd = prefix .. suffix
      local exists = vim.fn.exists(':' .. cmd) == 2
      record(exists, 'surface.' .. cmd, exists and '' or (':' .. cmd .. ' not registered'))
    end
  end
  do
    local exists = vim.fn.exists(':NuwikiInstall') == 2
    record(exists, 'surface.NuwikiInstall',
      exists and '' or ':NuwikiInstall not registered')
  end
  -- Asymmetric / compat-only spellings: the canonical :Nuwiki* name differs
  -- from the upstream :Vimwiki* name (or has no canonical counterpart because
  -- nuwiki already exposes it under a clearer name).
  local extra_surface = {
    'NuwikiTableAlign', 'VimwikiTableAlignQ', 'VimwikiTableAlignW',
    'NuwikiChangeSymbol', 'VimwikiChangeSymbolTo', 'VimwikiListChangeSymbolI',
    'NuwikiChangeSymbolInList', 'VimwikiChangeSymbolInListTo',
    'VimwikiDeleteLink', 'VimwikiRenameLink', 'VimwikiGenerateTags',
    'NuwikiRemoveCheckbox', 'VimwikiRemoveSingleCB',
    'NuwikiRemoveCheckboxInList', 'VimwikiRemoveCBInList',
  }
  for _, cmd in ipairs(extra_surface) do
    local exists = vim.fn.exists(':' .. cmd) == 2
    record(exists, 'surface.' .. cmd, exists and '' or (':' .. cmd .. ' not registered'))
  end
  do
    local callable = type(require('nuwiki.commands').follow_link_drop) == 'function'
    record(callable, 'direct.follow_link_drop_callable',
      callable and '' or 'nuwiki.commands.follow_link_drop is not a function')
  end

  -- ===== Pure-Lua command invocation (cursor movement) =====
  -- :NuwikiNextLink / :NuwikiPrevLink wrap the link-search motion and run
  -- without the LSP, so we can assert exact cursor movement here.
  do
    local ok, err = pcall(function()
      set_buf({ 'intro [[A]] more [[B]] end' })
      vim.api.nvim_win_set_cursor(0, { 1, 0 })
      vim.cmd('NuwikiNextLink')
      local c1 = vim.api.nvim_win_get_cursor(0)[2]
      if c1 ~= 6 then error('NextLink #1 col=' .. c1 .. ' want 6') end
      vim.cmd('NuwikiNextLink')
      local c2 = vim.api.nvim_win_get_cursor(0)[2]
      if c2 ~= 17 then error('NextLink #2 col=' .. c2 .. ' want 17') end
      vim.cmd('VimwikiPrevLink')
      local c3 = vim.api.nvim_win_get_cursor(0)[2]
      if c3 ~= 6 then error('PrevLink col=' .. c3 .. ' want 6') end
    end)
    record(ok, 'invoke.next_prev_link_cursor_movement', ok and '' or tostring(err))
  end

  -- ===== Documented mapping surface =====
  -- Every documented mapping must resolve to a buffer-local mapping in
  -- the mode(s) the doc lists it under. `modes` is a string of mode
  -- letters: n/x/o/i. The mouse group is opt-in — the harness enables it
  -- via setup({ mappings = { mouse = true } }).
  local function has_map(lhs, mode)
    local d = vim.fn.maparg(lhs, mode, false, true)
    return next(d) ~= nil and d.buffer == 1
  end
  local mapping_surface = {
    -- Links
    { '<CR>', 'n' }, { '<S-CR>', 'n' }, { '<C-CR>', 'n' }, { '<C-S-CR>', 'n' },
    { '<M-CR>', 'n' }, { '<D-CR>', 'n' },
    { '<BS>', 'n' }, { '<Tab>', 'n' }, { '<S-Tab>', 'n' }, { '+', 'nx' },
    -- Lists
    { '<C-Space>', 'nx' }, { '<C-@>', 'nx' }, { '<Nul>', 'nx' },
    { 'gnt', 'n' }, { 'gln', 'nx' }, { 'glp', 'nx' }, { 'glx', 'nx' },
    { 'glh', 'n' }, { 'gll', 'n' }, { 'gLh', 'n' }, { 'gLl', 'n' },
    -- Upstream case-variant aliases of gLh/gLl/gLr.
    { 'gLH', 'n' }, { 'gLL', 'n' }, { 'gLR', 'n' },
    { 'glr', 'n' }, { 'gLr', 'n' }, { 'gl', 'n' }, { 'gL', 'n' },
    { 'gl-', 'n' }, { 'gL-', 'n' }, { 'gl*', 'n' }, { 'gL*', 'n' },
    { 'gl#', 'n' }, { 'gL#', 'n' }, { 'gl1', 'n' }, { 'gL1', 'n' },
    { 'gli', 'n' }, { 'gLi', 'n' }, { 'glI', 'n' }, { 'gLI', 'n' },
    { 'gla', 'n' }, { 'gLa', 'n' }, { 'glA', 'n' }, { 'gLA', 'n' },
    { 'o', 'n' }, { 'O', 'n' },
    -- Headers
    { '=', 'n' }, { '-', 'n' }, { ']]', 'n' }, { '[[', 'n' },
    { ']=', 'n' }, { '[=', 'n' }, { ']u', 'n' }, { '[u', 'n' },
    -- Tables
    { 'gqq', 'n' }, { 'gq1', 'n' }, { 'gww', 'n' }, { 'gw1', 'n' },
    { '<A-Left>', 'n' }, { '<A-Right>', 'n' },
    -- Wiki / diary / export
    { '<Leader>ww', 'n' }, { '<Leader>ws', 'n' }, { '<Leader>wi', 'n' },
    { '<Leader>w<Leader>w', 'n' }, { '<Leader>w<Leader>y', 'n' },
    { '<Leader>w<Leader>t', 'n' }, { '<Leader>w<Leader>m', 'n' },
    { '<Leader>w<Leader>i', 'n' },
    { '<Leader>wn', 'n' }, { '<Leader>wd', 'n' }, { '<Leader>wr', 'n' },
    { '<Leader>wh', 'n' }, { '<Leader>whh', 'n' }, { '<Leader>wha', 'n' },
    { '<Leader>wc', 'nx' }, { '<C-Down>', 'n' }, { '<C-Up>', 'n' },
    -- Mouse (opt-in)
    { '<2-LeftMouse>', 'n' }, { '<S-2-LeftMouse>', 'n' }, { '<C-2-LeftMouse>', 'n' },
    { '<MiddleMouse>', 'n' }, { '<RightMouse>', 'n' },
    -- Text objects (operator-pending + visual)
    { 'ah', 'ox' }, { 'ih', 'ox' }, { 'aH', 'ox' }, { 'iH', 'ox' },
    { 'al', 'ox' }, { 'il', 'ox' }, { 'a\\', 'ox' }, { 'i\\', 'ox' },
    { 'ac', 'ox' }, { 'ic', 'ox' },
    -- Insert-mode
    { '<CR>', 'i' }, { '<Tab>', 'i' }, { '<S-Tab>', 'i' },
    { '<C-D>', 'i' }, { '<C-T>', 'i' },
    { '<C-L><C-J>', 'i' }, { '<C-L><C-K>', 'i' }, { '<C-L><C-M>', 'i' },
  }
  for _, entry in ipairs(mapping_surface) do
    local lhs, modes = entry[1], entry[2]
    for m in modes:gmatch('.') do
      local ok = has_map(lhs, m)
      record(ok, 'map[' .. m .. '].' .. lhs,
        ok and '' or (lhs .. ' (' .. m .. ') not mapped buffer-local'))
    end
  end

  -- ===== Config-driven buffer behaviors =====
  -- autowriteall (default on) mirrors into Vim's global 'autowriteall' while
  -- the wiki buffer is current.
  record(vim.o.autowriteall == true, 'config.autowriteall_applied',
    vim.o.autowriteall and '' or 'autowriteall not set on the wiki buffer')
  -- table_auto_fmt wiring: with the option enabled, attaching a buffer
  -- registers a buffer-local InsertLeave autocmd. (It's off in the harness
  -- setup so the async re-align doesn't perturb the table-nav cases below, so
  -- verify on a throwaway scratch buffer in its own window.)
  do
    local cfg = require('nuwiki.config')
    cfg.options.table_auto_fmt = true
    vim.cmd('new')
    local sbuf = vim.api.nvim_get_current_buf()
    require('nuwiki.ftplugin').attach(sbuf)
    local found = false
    for _, a in ipairs(vim.api.nvim_get_autocmds({ event = 'InsertLeave', buffer = sbuf })) do
      if a.group_name and a.group_name:match('^nuwiki_taf_') then
        found = true
        break
      end
    end
    record(found, 'config.table_auto_fmt_autocmd',
      found and '' or 'attach did not register the InsertLeave autocmd when enabled')
    cfg.options.table_auto_fmt = false
    vim.cmd('bwipeout!')
  end

  -- ===== Lists =====

  run('list.toggle_via_C-Space', {
    lines = { '= test =', '- [ ] task' },
    cursor = { 2, 0 },
    keys = '<C-Space>',
    expect_line = '- [X] task',
    expect_at = 2,
  })
  run('list.toggle_via_C-@', {
    lines = { '= test =', '- [ ] task' },
    cursor = { 2, 0 },
    keys = '<C-@>',
    expect_line = '- [X] task',
    expect_at = 2,
  })
  run('list.toggle_via_Nul', {
    lines = { '= test =', '- [ ] task' },
    cursor = { 2, 0 },
    keys = '<Nul>',
    expect_line = '- [X] task',
    expect_at = 2,
  })
  run('list.cycle_via_gln', {
    lines = { '- [ ] task' },
    cursor = { 1, 0 },
    keys = 'gln',
    expect_line = '- [.] task',
    expect_at = 1,
  })
  run('list.reject_via_glx', {
    lines = { '- [ ] task' },
    cursor = { 1, 0 },
    keys = 'glx',
    expect_line = '- [-] task',
    expect_at = 1,
  })
  run('list.toggle_round_trip', {
    lines = { '- [X] done' },
    cursor = { 1, 0 },
    keys = '<C-Space>',
    expect_line = '- [ ] done',
    expect_at = 1,
  })
  -- `glp` must cycle BACKWARD (regression for the glp==gln bug). From
  -- `[.]` the backward step lands on `[ ]`, whereas `gln` would advance
  -- to `[o]`.
  run('list.cycle_back_via_glp', {
    lines = { '- [.] task' },
    cursor = { 1, 0 },
    keys = 'glp',
    expect_line = '- [ ] task',
    expect_at = 1,
  })
  run('list.cycle_back_via_glp_wraps', {
    -- `[ ]` backward wraps to the top of the progression (`[X]`).
    lines = { '- [ ] task' },
    cursor = { 1, 0 },
    keys = 'glp',
    expect_line = '- [X] task',
    expect_at = 1,
  })

  -- ===== Change level (glh/gll) =====

  run('list.indent_via_gll', {
    lines = { '- item' },
    cursor = { 1, 0 },
    keys = 'gll',
    expect_line = '  - item',
    expect_at = 1,
  })
  run('list.dedent_via_glh', {
    lines = { '  - item' },
    cursor = { 1, 2 },
    keys = 'glh',
    expect_line = '- item',
    expect_at = 1,
  })

  -- ===== Renumber (glr / gLr) =====

  run('list.renumber_via_glr', {
    lines = { '5. one', '9. two', '2. three' },
    cursor = { 1, 0 },
    keys = 'glr',
    expect_lines = { '1. one', '2. two', '3. three' },
  })

  -- ===== Remove checkbox (bare gl item / gL whole list) =====

  -- Bare `gl` strips the checkbox from the cursor's item, keeping the text.
  run('list.remove_checkbox_item_via_gl', {
    lines = { '= test =', '- [ ] task', '- [X] done' },
    cursor = { 2, 0 },
    keys = 'gl',
    expect_line = '- task',
    expect_at = 2,
  })
  -- Bare `gL` strips the checkbox from every item in the cursor's list.
  run('list.remove_checkbox_list_via_gL', {
    lines = { '- [ ] a', '- [X] b', '- [ ] c' },
    cursor = { 1, 0 },
    keys = 'gL',
    expect_lines = { '- a', '- b', '- c' },
  })

  -- ===== Remove done (command-only: :NuwikiRemoveDone[!]) =====

  -- `:NuwikiRemoveDone` removes done items from the cursor's list only; the
  -- second list's done item survives.
  run('list.remove_done_current_list_via_command', {
    lines = {
      '- [X] done a', '- [ ] todo a', '',
      'paragraph', '',
      '- [ ] todo b', '- [X] done b',
    },
    cursor = { 1, 0 },
    keys = ':NuwikiRemoveDone<CR>',
    expect_lines = {
      '- [ ] todo a', '',
      'paragraph', '',
      '- [ ] todo b', '- [X] done b',
    },
  })
  -- `:NuwikiRemoveDone!` sweeps the whole buffer regardless of cursor position.
  run('list.remove_done_whole_buffer_via_command_bang', {
    lines = {
      '- [X] done a', '- [ ] todo a', '',
      'paragraph', '',
      '- [ ] todo b', '- [X] done b',
    },
    cursor = { 1, 0 },
    keys = ':NuwikiRemoveDone!<CR>',
    expect_lines = {
      '- [ ] todo a', '',
      'paragraph', '',
      '- [ ] todo b',
    },
  })

  -- ===== Next task (gnt) =====

  run('list.gnt_jumps_to_unfinished', {
    lines = { '- [X] done', '- [ ] todo', '- [ ] later' },
    cursor = { 1, 0 },
    keys = 'gnt',
    expect_cursor_line = 2,
    wait_ms = 600,
  })

  -- ===== Heading levels =====

  run('heading.add_level_with_=', {
    lines = { '= H1 =' },
    cursor = { 1, 0 },
    keys = '=',
    expect_line = '== H1 ==',
    expect_at = 1,
  })
  run('heading.remove_level_with_-', {
    lines = { '== H2 ==' },
    cursor = { 1, 0 },
    keys = '-',
    expect_line = '= H2 =',
    expect_at = 1,
  })
  run('heading.add_level_clamps_at_6', {
    lines = { '====== H6 ======' },
    cursor = { 1, 0 },
    keys = '=',
    expect_line = '====== H6 ======', -- unchanged
    expect_at = 1,
  })

  -- ===== Header nav (pure Lua, no LSP) =====

  run('headers.]]_jumps_to_next', {
    lines = { '= One =', 'body', '== Two ==', 'body', '= Three =' },
    cursor = { 1, 0 },
    keys = ']]',
    expect_cursor_line = 3,
    wait_ms = 100,
  })
  run('headers.[[_jumps_to_prev', {
    lines = { '= One =', 'body', '== Two ==', 'body', '= Three =' },
    cursor = { 5, 0 },
    keys = '[[',
    expect_cursor_line = 3,
    wait_ms = 100,
  })
  run('headers.]u_jumps_to_parent', {
    lines = { '= Parent =', '== Child ==', 'body' },
    cursor = { 3, 0 },
    keys = ']u',
    expect_cursor_line = 1,
    wait_ms = 100,
  })

  -- ===== Link nav (pure Lua) =====

  run('links.<Tab>_jumps_to_next_wikilink', {
    lines = { 'intro [[A]] more [[B]] end' },
    cursor = { 1, 0 },
    keys = '<Tab>',
    expect_cursor_line = 1,
    wait_ms = 100,
  })

  -- ===== <CR> two-step =====

  run('cr.wraps_bare_word_first_press', {
    lines = { 'MyPage rest' },
    cursor = { 1, 3 },
    keys = '<CR>',
    expect_line = '[[MyPage]] rest',
    expect_at = 1,
    wait_ms = 200,
  })

  -- ===== Link helpers (Cluster C) =====

  run('links.normalize_via_+', {
    lines = { 'MyPage rest' },
    cursor = { 1, 3 },
    keys = '+',
    expect_line = '[[MyPage]] rest',
    expect_at = 1,
    wait_ms = 200,
  })

  -- ===== Bullet continuation (o/O) =====

  run('lists.o_continues_list_marker', {
    lines = { '- first' },
    cursor = { 1, 0 },
    keys = 'o<Esc>',
    expect_lines = { '- first', '- ' },
    wait_ms = 100,
  })
  run('lists.o_continues_checkbox', {
    lines = { '- [ ] first' },
    cursor = { 1, 0 },
    keys = 'o<Esc>',
    expect_lines = { '- [ ] first', '- [ ] ' },
    wait_ms = 100,
  })
  run('lists.O_continues_above', {
    lines = { '- second' },
    cursor = { 1, 0 },
    keys = 'O<Esc>',
    expect_lines = { '- ', '- second' },
    wait_ms = 100,
  })

  -- ===== Insert-mode list bindings (Cluster 2) =====

  run('insert.C-L_C-M_adds_checkbox', {
    lines = { '- task' },
    cursor = { 1, 0 },
    keys = 'A<C-L><C-M><Esc>',
    expect_line = '- [ ] task',
    expect_at = 1,
    wait_ms = 200,
  })
  run('insert.C-L_C-M_toggles_existing_checkbox', {
    lines = { '- [ ] task' },
    cursor = { 1, 0 },
    keys = 'A<C-L><C-M><Esc>',
    expect_line = '- [X] task',
    expect_at = 1,
  })
  -- End-to-end regression for changeSymbol over LSP — direct call
  -- (no keymap) so we can spot a stale `bin/nuwiki-ls` or a dispatch
  -- error fast. Toggle has separate coverage above via `<C-Space>`.
  do
    local ok, err = pcall(function()
      set_buf({ '- [ ] item', '- [ ] two' })
      sleep(200)
      vim.api.nvim_win_set_cursor(0, { 1, 0 })
      require('nuwiki.commands').list_change_symbol('*', false)
      sleep(1500)
      local got = get_line(1)
      if got ~= '* [ ] item' then
        error(string.format('change_symbol failed: got %q', got))
      end
    end)
    record(ok, 'direct.list_change_symbol_via_lsp', ok and '' or tostring(err))
  end
  run('insert.C-L_C-J_cycles_marker_forward', {
    lines = { '- item' },
    cursor = { 1, 0 },
    keys = 'A<C-L><C-J><Esc>',
    expect_line = '* item',
    expect_at = 1,
    wait_ms = 1500,
  })
  run('insert.C-L_C-K_cycles_marker_backward', {
    -- From `-` going backward wraps to the end of the order (`I)`).
    lines = { '- item' },
    cursor = { 1, 0 },
    keys = 'A<C-L><C-K><Esc>',
    expect_line = 'I) item',
    expect_at = 1,
    wait_ms = 1500,
  })

  -- ===== Text objects (Cluster 3) =====
  -- Exercise the pure helpers directly (cell ranges, heading block,
  -- table bounds). The visual-mode integration is verified in a single
  -- end-to-end case via mark inspection, which exercises the full
  -- operator-pending path.

  local function tobj_case(name, fn)
    local ok, err = pcall(fn)
    record(ok, name, ok and '' or tostring(err))
  end

  tobj_case('textobj.heading_block_section_only', function()
    set_buf({ '= h1 =', 'a', '== h2 ==', 'b', '== h3 ==', 'c' })
    local s, e = require('nuwiki.textobjects')._heading_block(1, false)
    if not (s == 1 and e == 2) then
      error(string.format('section_only: got (%s,%s) want (1,2)', s, e))
    end
  end)
  tobj_case('textobj.heading_block_subtree', function()
    set_buf({ '= h1 =', 'a', '== h2 ==', 'b', '== h3 ==', 'c' })
    local s, e = require('nuwiki.textobjects')._heading_block(1, true)
    if not (s == 1 and e == 6) then
      error(string.format('subtree: got (%s,%s) want (1,6)', s, e))
    end
  end)
  tobj_case('textobj.cell_ranges_three_cells', function()
    local r = require('nuwiki.textobjects')._cell_ranges('| a | b | c |')
    if #r ~= 3 then error('want 3 cells, got ' .. #r) end
    -- Inside each cell, content includes the surrounding spaces.
    if not (r[1][1] == 2 and r[2][1] > r[1][2] and r[3][1] > r[2][2]) then
      error('cell ordering broken: ' .. vim.inspect(r))
    end
  end)
  tobj_case('textobj.current_cell_picks_middle', function()
    -- `| a | b | c |` cursor on the `b` (1-based col 8).
    local idx = require('nuwiki.textobjects')._current_cell_for_line(
      '| a | b | c |', 8)
    if idx ~= 2 then error('expected cell 2, got ' .. tostring(idx)) end
  end)
  tobj_case('textobj.table_bounds_walks_contig_block', function()
    set_buf({ 'before', '| a | b |', '| c | d |', '', 'after' })
    vim.api.nvim_win_set_cursor(0, { 2, 0 })
    local s, e = require('nuwiki.textobjects')._table_bounds(2)
    if not (s == 2 and e == 3) then
      error(string.format('want (2,3) got (%s,%s)', s, e))
    end
  end)

  -- One end-to-end: operator-pending `dah` should delete the heading
  -- section. This avoids the visual-mode `'<`/`'>` mark dance and
  -- relies on Vim's actual operator pipeline to verify the keymap is
  -- correctly wired into `omap`.
  tobj_case('textobj.dah_deletes_heading_section', function()
    set_buf({ '= h1 =', 'body', '= h2 =', 'rest' })
    vim.api.nvim_win_set_cursor(0, { 1, 0 })
    send('dah')
    sleep(100)
    local got = get_lines()
    -- After deleting heading section (lines 1-2), buffer should be the
    -- remaining two lines. There may be a trailing empty line depending
    -- on linewise delete semantics; allow both shapes.
    if not (vim.deep_equal(got, { '= h2 =', 'rest' })
        or vim.deep_equal(got, { '', '= h2 =', 'rest' })) then
      error('dah result: ' .. vim.inspect(got))
    end
  end)

  -- ===== Smart <CR> (Cluster 5) =====

  run('cr.continues_list_marker', {
    lines = { '- first' },
    cursor = { 1, 7 }, -- end of line
    keys = 'A<CR>second<Esc>',
    expect_lines = { '- first', '- second' },
    wait_ms = 100,
  })
  run('cr.continues_checkbox', {
    lines = { '- [ ] first' },
    cursor = { 1, 11 },
    keys = 'A<CR>second<Esc>',
    expect_lines = { '- [ ] first', '- [ ] second' },
    wait_ms = 100,
  })
  run('cr.breaks_on_empty_list_line', {
    lines = { '- ' },
    cursor = { 1, 2 },
    keys = 'A<CR>plain<Esc>',
    expect_lines = { '', 'plain' },
    wait_ms = 100,
  })
  run('cr.adds_new_table_row', {
    lines = { '| a | b |' },
    cursor = { 1, 4 }, -- inside `a`
    keys = 'A<CR>x<Esc>',
    -- New row inserted below with empty cells; cursor jumps to first.
    expect_lines = { '| a | b |', '|x   |   |' },
    wait_ms = 100,
  })

  -- ===== Insert-mode table navigation (Cluster 6) =====

  run('tab.next_cell_in_table', {
    lines = { '| a | b |' },
    cursor = { 1, 2 }, -- inside cell `a`
    keys = 'A<Tab>x<Esc>',
    -- After A: cursor at end. <Tab>: no cell-start strictly after end
    -- so creates new row. Try cursor on inside-first-cell case below.
    -- Here cursor at end has no next cell so a new row is added.
    expect_lines = { '| a | b |', '|x   |   |' },
    wait_ms = 100,
  })
  run('tab.from_first_cell_moves_to_second', {
    lines = { '| a | b |' },
    cursor = { 1, 0 },
    keys = 'lli<Tab>x<Esc>',
    -- `ll` from col 0 → col 2 (on `a`). `i` enters insert. `<Tab>`
    -- jumps to col after next `|`. `x` types in second cell.
    expect_lines = { '| a |x b |' },
    wait_ms = 100,
  })
  run('tab.cycles_to_next_row_when_not_last', {
    lines = { '| a | b |', '|---|---|', '| c | d |' },
    cursor = { 1, 6 }, -- inside last cell of header row
    keys = 'i<Tab>x<Esc>',
    -- Past the final cell of row 1: skip separator, land in first cell of row 3.
    expect_lines = { '| a | b |', '|---|---|', '|x c | d |' },
    wait_ms = 100,
  })
  run('tab.inserts_row_only_when_on_last_row', {
    lines = { '| a | b |', '|---|---|', '| c | d |' },
    cursor = { 3, 6 }, -- inside last cell of last data row
    keys = 'i<Tab>x<Esc>',
    expect_lines = { '| a | b |', '|---|---|', '| c | d |', '|x   |   |' },
    wait_ms = 100,
  })
  run('shift_tab.prev_cell_in_table', {
    lines = { '| a | b |' },
    cursor = { 1, 6 }, -- inside cell `b`
    keys = 'i<S-Tab>x<Esc>',
    -- Cursor lands just after the previous cell's `|`; typing `x`
    -- inserts at col 2 (before the leading space inside cell 1).
    expect_lines = { '|x a | b |' },
    wait_ms = 100,
  })
  run('tab.outside_table_passes_through', {
    lines = { 'plain text' },
    cursor = { 1, 0 },
    keys = 'i<Tab>x<Esc>',
    -- Default Tab inserts a literal tab.
    expect_lines = { '\tx' .. 'plain text' },
    wait_ms = 100,
  })

  -- ===== Diary nav =====
  -- Tested via the LSP open-* responses; can't fully validate without
  -- a populated diary, but at least confirm the maps fire without
  -- error.

  -- ===== Colorize commands pass their {color} arg (regression) =====
  -- :VimwikiColorize / :NuwikiColorize are -nargs=1; the Neovim defs used to
  -- call colorize() without <q-args>, silently dropping the colour and
  -- prompting instead. Run the real commands and assert the colour lands.
  tobj_case('cmd.VimwikiColorize_uses_arg', function()
    set_buf({ 'word here' })
    vim.api.nvim_win_set_cursor(0, { 1, 0 })
    vim.cmd('VimwikiColorize red')
    local got = vim.api.nvim_get_current_line()
    if got ~= '<span style="color:red">word</span> here' then
      error('VimwikiColorize dropped its arg: ' .. got)
    end
  end)
  tobj_case('cmd.NuwikiColorize_uses_arg', function()
    set_buf({ 'second word' })
    vim.api.nvim_win_set_cursor(0, { 1, 0 })
    vim.cmd('NuwikiColorize #00ff00')
    local got = vim.api.nvim_get_current_line()
    if got ~= '<span style="color:#00ff00">second</span> word' then
      error('NuwikiColorize dropped its arg: ' .. got)
    end
  end)
  -- Establish a stale visual selection, then confirm the normal-mode command
  -- still wraps the cword (not the leftover selection) — the visualmode()
  -- heuristic regression.
  tobj_case('cmd.Colorize_ignores_stale_visual_selection', function()
    set_buf({ 'alpha beta gamma' })
    vim.cmd('normal! 0vee\27') -- select 'alpha beta', leave marks behind
    vim.api.nvim_win_set_cursor(0, { 1, 11 }) -- on 'gamma'
    vim.cmd('VimwikiColorize blue')
    local got = vim.api.nvim_get_current_line()
    if got ~= 'alpha beta <span style="color:blue">gamma</span>' then
      error('command wrapped stale selection instead of cword: ' .. got)
    end
  end)
  -- The visual mapping path (explicit visual=true) wraps the selection.
  tobj_case('colorize.visual_wraps_selection', function()
    set_buf({ 'one two three' })
    vim.cmd('normal! 0wviw\27') -- visually select 'two', marks set on exit
    require('nuwiki.commands').colorize('red', true)
    local got = vim.api.nvim_get_current_line()
    if got ~= 'one <span style="color:red">two</span> three' then
      error('visual colorize did not wrap selection: ' .. got)
    end
  end)
  -- Invoking the command with a range (`:'<,'>VimwikiColorize`, as Vim builds
  -- it when you select then type the command) must not error (-range) and
  -- wraps the selection.
  tobj_case('cmd.Colorize_range_wraps_selection', function()
    set_buf({ 'pick this word' })
    vim.cmd('normal! 0wviw\27') -- select 'this'
    vim.cmd("'<,'>VimwikiColorize orange")
    local got = vim.api.nvim_get_current_line()
    if got ~= 'pick <span style="color:orange">this</span> word' then
      error('ranged command did not wrap selection: ' .. got)
    end
  end)
  -- Colour spans are concealed down to their coloured text. Put the span on a
  -- non-cursor line so concealcursor (=c) doesn't reveal it, then refresh.
  tobj_case('colorize.conceal_hides_tags_shows_text', function()
    set_buf({ 'plain line', '<span style="color:red">word</span> tail' })
    vim.api.nvim_win_set_cursor(0, { 1, 0 })
    vim.fn['nuwiki#colors#refresh']()
    local l = vim.fn.getline(2)
    local wcol = (l:find('word')) -- 1-based
    local open = vim.fn.synconcealed(2, 1)[1]
    local close = vim.fn.synconcealed(2, (l:find('</span>')))[1]
    local word = vim.fn.synconcealed(2, wcol)[1]
    local grp = vim.fn.synIDattr(vim.fn.synID(2, wcol, 1), 'name')
    if not (open == 1 and close == 1 and word == 0 and grp == 'nuwikiColorSpan_red') then
      error(string.format('open=%s close=%s word=%s grp=%s', open, close, word, grp))
    end
  end)

  -- ===== Visual-range list commands + normalize-visual (regression) =====
  -- :N,MVimwikiToggleListItem toggles every checkbox in the range (server,
  -- one request per line; wait for the edits to land).
  tobj_case('cmd.toggle_list_item_range', function()
    set_buf({ '- [ ] a', '- [ ] b', '- [ ] c' })
    vim.cmd('1,3VimwikiToggleListItem')
    local done = vim.wait(2000, function()
      for _, l in ipairs(vim.api.nvim_buf_get_lines(0, 0, -1, false)) do
        if not l:match('%[[xX]%]') then return false end
      end
      return true
    end, 30)
    if not done then
      error('range toggle incomplete: ' .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
    end
  end)
  -- `:1,3VimwikiToggleRejectedListItem` — now -range (was bare → E481 on a
  -- ranged invocation, and cursor-only). Each line should gain a rejected
  -- checkbox `[-]`.
  tobj_case('cmd.reject_list_item_range', function()
    set_buf({ '- [ ] a', '- [ ] b', '- [ ] c' })
    vim.cmd('1,3VimwikiToggleRejectedListItem')
    local done = vim.wait(2000, function()
      for _, l in ipairs(vim.api.nvim_buf_get_lines(0, 0, -1, false)) do
        if not l:match('%[%-%]') then return false end
      end
      return true
    end, 30)
    if not done then
      error('range reject incomplete: ' .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
    end
  end)
  -- `:1,2VimwikiRemoveDone` — now -range (was -bang only → E481 on a ranged
  -- invocation). Only done items within the range are removed; line-2 `[X]`
  -- (0-indexed) outside [0,1] survives.
  tobj_case('cmd.remove_done_range', function()
    set_buf({ '- [X] a', '- [ ] b', '- [X] c' })
    vim.cmd('1,2VimwikiRemoveDone')
    local done = vim.wait(2000, function()
      local ls = vim.api.nvim_buf_get_lines(0, 0, -1, false)
      -- line-0 done item gone (2 lines left), line-2 done item still present.
      return #ls == 2 and ls[#ls]:match('%[X%] c')
    end, 30)
    if not done then
      error('ranged remove-done wrong: ' .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
    end
  end)
  -- `:VimwikiTable {cols} [rows]` — now -nargs=* (was -nargs=1, which dropped
  -- the args entirely). A 4-col table has 5 pipes per row; 3 data rows give
  -- header + separator + 3 = 5 table lines.
  tobj_case('cmd.VimwikiTable_passes_cols_and_rows', function()
    set_buf({ '' })
    vim.api.nvim_win_set_cursor(0, { 1, 0 })
    vim.cmd('VimwikiTable 4 3')
    local tbl = {}
    local done = vim.wait(2000, function()
      tbl = {}
      for _, l in ipairs(vim.api.nvim_buf_get_lines(0, 0, -1, false)) do
        if l:find('|', 1, true) then tbl[#tbl + 1] = l end
      end
      return #tbl >= 5
    end, 30)
    if not done then
      error('table not inserted: ' .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
    end
    local pipes = select(2, tbl[1]:gsub('|', ''))
    if pipes ~= 5 then
      error('want 4 cols (5 pipes), got ' .. pipes .. ': ' .. tbl[1])
    end
    if #tbl ~= 5 then
      error('want 5 table lines (hdr+sep+3 rows), got ' .. #tbl)
    end
  end)
  -- The Neovim :Vimwiki*Link Ex-commands used to dispatch to raw
  -- vim.lsp.buf.definition(), bypassing the bare-word → [[link]] wrap that the
  -- Vim branch and the <CR> mapping do. They now route through
  -- follow_link_or_create; the wrap is a pure client-side buffer edit (no LSP),
  -- so it's the headlessly-reliable observable.
  tobj_case('cmd.VimwikiFollowLink_wraps_bare_word', function()
    set_buf({ 'word here' })
    vim.api.nvim_win_set_cursor(0, { 1, 0 })
    vim.cmd('VimwikiFollowLink')
    local got = vim.api.nvim_get_current_line()
    if got ~= '[[word]] here' then
      error('VimwikiFollowLink did not wrap bare word: ' .. got)
    end
  end)
  tobj_case('cmd.VimwikiSplitLink_wraps_bare_word', function()
    set_buf({ 'word here' })
    vim.api.nvim_win_set_cursor(0, { 1, 0 })
    vim.cmd('VimwikiSplitLink')
    local got = vim.api.nvim_get_current_line()
    vim.cmd('only') -- drop the split this command opened
    if got ~= '[[word]] here' then
      error('VimwikiSplitLink did not wrap bare word: ' .. got)
    end
  end)
  -- `:[range]VimwikiListChangeLvl {dir} [plus_children]` — now -range -nargs=+
  -- (was -nargs=?, range-less). A 1,3 range with `increase` must indent the
  -- items that have somewhere to nest (the 2nd item under the 1st).
  tobj_case('cmd.ListChangeLvl_range_indents', function()
    set_buf({ '- a', '- b', '- c' })
    vim.cmd('1,3VimwikiListChangeLvl increase 0')
    local done = vim.wait(2000, function()
      local l = vim.api.nvim_buf_get_lines(0, 0, -1, false)
      return l[2] ~= nil and l[2]:match('^%s%s*%-') ~= nil
    end, 30)
    if not done then
      error('range list-change-lvl did not indent: '
        .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
    end
  end)
  -- `:[range]VimwikiChangeSymbolTo {sym}` — now -range -nargs=1. A 1,3 range
  -- must set every item's marker to the given symbol.
  tobj_case('cmd.ChangeSymbolTo_range_sets_marker', function()
    set_buf({ '- a', '- b', '- c' })
    vim.cmd('1,3VimwikiChangeSymbolTo *')
    local done = vim.wait(2000, function()
      local l = vim.api.nvim_buf_get_lines(0, 0, -1, false)
      for _, ln in ipairs(l) do
        if not ln:match('^%*%s') then return false end
      end
      return true
    end, 30)
    if not done then
      error('range change-symbol did not set all markers: '
        .. vim.inspect(vim.api.nvim_buf_get_lines(0, 0, -1, false)))
    end
  end)
  -- `:VimwikiGenerateLinks [rel_path]` — now -nargs=? (was bare; an arg raised
  -- E488). Both forms must dispatch without a Vim-level command error.
  tobj_case('cmd.GenerateLinks_accepts_optional_path', function()
    set_buf({ '= page =' })
    local ok1 = pcall(vim.cmd, 'VimwikiGenerateLinks')
    local ok2 = pcall(vim.cmd, 'VimwikiGenerateLinks subdir')
    if not (ok1 and ok2) then
      error('GenerateLinks rejected an arg: ok1=' .. tostring(ok1) .. ' ok2=' .. tostring(ok2))
    end
  end)
  -- :NuwikiGenerateTags alias must exist (parity with :VimwikiGenerateTags).
  tobj_case('cmd.NuwikiGenerateTags_exists', function()
    if vim.fn.exists(':NuwikiGenerateTags') ~= 2 then
      error(':NuwikiGenerateTags not defined')
    end
  end)
  -- Diary-note family carries -count=0 (vimwiki's wiki selector), so
  -- `:2VimwikiMakeDiaryNote` selects wiki #2 instead of raising E481.
  tobj_case('cmd.VimwikiMakeDiaryNote_has_count', function()
    local c = vim.api.nvim_buf_get_commands(0, {}).VimwikiMakeDiaryNote
    if not c then error(':VimwikiMakeDiaryNote not defined') end
    if c.count == nil or c.count == false then
      error('VimwikiMakeDiaryNote missing -count: ' .. vim.inspect(c))
    end
  end)
  -- `:VimwikiNormalizeLink 1` (the arg is upstream's visual flag; the command
  -- is -nargs=? not -range, so no `'<,'>`) wraps the last visual selection.
  tobj_case('cmd.normalize_link_visual_wraps_selection', function()
    set_buf({ 'one two three' })
    vim.cmd('normal! 0wviw\27') -- select 'two', leave visual (sets '<,'> marks)
    vim.cmd('VimwikiNormalizeLink 1')
    local got = vim.api.nvim_get_current_line()
    if got ~= 'one [[two]] three' then
      error('visual normalize did not wrap selection: ' .. got)
    end
  end)

  -- ===== Configurable map_prefix (vimwiki g:vimwiki_map_prefix) =====
  -- Overriding map_prefix must relocate the whole <prefix>* family. We attach
  -- to a throwaway scratch buffer with a custom prefix and assert the new
  -- bindings exist there while the default <Leader>w* ones do not.
  tobj_case('map_prefix.relocates_wiki_family', function()
    local config = require('nuwiki.config')
    local keymaps = require('nuwiki.keymaps')
    local saved = config.options.map_prefix
    config.options.map_prefix = '<Leader>n'
    local buf = vim.api.nvim_create_buf(false, true)
    vim.api.nvim_set_current_buf(buf)
    local ok, err = pcall(function()
      keymaps.attach(buf, { enabled = true, wiki_prefix = true, links = true, html_export = true })
      local function bmap(lhs)
        local d = vim.fn.maparg(lhs, 'n', false, true)
        return not vim.tbl_isempty(d) and d.buffer == 1
      end
      for _, lhs in ipairs({
        '<Leader>nw', '<Leader>nt', '<Leader>n<Leader>w', '<Leader>nr', '<Leader>nh', '<Leader>nha',
      }) do
        if not bmap(lhs) then error('relocated map missing: ' .. lhs) end
      end
      if bmap('<Leader>ww') then error('<Leader>ww still bound under custom prefix') end
    end)
    -- Always restore global state so later cases see the default prefix.
    config.options.map_prefix = saved
    vim.api.nvim_buf_delete(buf, { force = true })
    if not ok then error(err) end
  end)

  -- ===== Global (non-buffer) entry-point diary maps =====
  -- init.lua _setup_global_mappings ran during setup(). Regression guard for
  -- the audit-found bug: <prefix><Leader>t must be today-in-a-tab and
  -- <prefix><Leader>m must be tomorrow (matching the Vim global side +
  -- upstream), not the old wiring that dropped `m` and bound `t` to tomorrow.
  -- Query in a scratch (non-vimwiki) buffer so the buffer-local maps don't
  -- shadow the globals.
  tobj_case('global_maps.diary_tab_and_tomorrow_targets', function()
    local buf = vim.api.nvim_create_buf(false, true)
    vim.api.nvim_set_current_buf(buf)
    local function gdesc(lhs)
      local d = vim.fn.maparg(lhs, 'n', false, true)
      if vim.tbl_isempty(d) then return nil end
      return d.desc or ''
    end
    local ok, err = pcall(function()
      local t = gdesc('<Leader>w<Leader>t')
      local m = gdesc('<Leader>w<Leader>m')
      if not t then error('<Leader>w<Leader>t global map missing') end
      if not m then error('<Leader>w<Leader>m global map missing (tomorrow)') end
      if not t:find('tab') then error('<Leader>w<Leader>t should be today-in-tab, desc=' .. t) end
      if not m:find('tomorrow') then error('<Leader>w<Leader>m should be tomorrow, desc=' .. m) end
    end)
    vim.api.nvim_buf_delete(buf, { force = true })
    if not ok then error(err) end
  end)

  -- ===== Wiki picker (config-driven, no LSP) =====
  -- The picker must build its list from config so it works from any buffer
  -- before the server attaches.
  tobj_case('wiki_select.config_list_reads_g_var', function()
    vim.g.nuwiki_wikis = {
      { name = 'Personal', root = '/tmp/nuwiki-a' },
      { name = 'Work', root = '/tmp/nuwiki-b', file_extension = 'md' },
    }
    local list = require('nuwiki.config').wiki_list()
    vim.g.nuwiki_wikis = nil
    if #list ~= 2 then error('want 2 wikis, got ' .. #list) end
    if list[1].name ~= 'Personal' or list[2].name ~= 'Work' then
      error('names/order broken: ' .. vim.inspect(list))
    end
    if list[2].ext ~= '.md' then
      error('per-wiki extension not honoured: ' .. tostring(list[2].ext))
    end
  end)

  -- ===== Wrap up =====

  table.insert(out_lines, '')
  -- Dump captured server log_messages only on failure — useful for
  -- diagnosing dispatch errors that the LSP swallows into log_message.
  if fail > 0 and #server_log > 0 then
    table.insert(out_lines, '--- server log_messages ---')
    for _, l in ipairs(server_log) do
      table.insert(out_lines, l)
    end
    table.insert(out_lines, '')
  end
  table.insert(out_lines, string.format('SUMMARY: %d passed, %d failed', pass, fail))
  vim.fn.writefile(out_lines, OUT)
  vim.cmd(fail == 0 and 'qall!' or 'cquit!')
end, 1500)