-- lua/nuwiki/health.lua — `:checkhealth nuwiki` target.
--
-- v1.0 checks per SPEC §7.6 (binary, version, filetype, LSP attach).
-- v1.1 §12.10 additions: registered LSP commands, indexed wikis, HTML
-- output path writability, default keymaps installed.

local M = {}

local function bin_section()
  local install = require('nuwiki.install')
  local bin = install.expected_path()
  if install.is_installed() then
    vim.health.ok('binary present at ' .. bin)
    local out = vim.fn.system({ bin, '--version' })
    if vim.v.shell_error == 0 then
      vim.health.ok('binary --version: ' .. (out:gsub('\n', ' ')):gsub('^%s+', ''))
    else
      vim.health.warn(
        'binary did not respond to --version',
        { 'Re-install with :lua require("nuwiki").install()' }
      )
    end
  else
    vim.health.error(
      'binary not found at ' .. bin,
      { 'Run :lua require("nuwiki").install() to install' }
    )
  end
end

local function wiki_root_section(opts)
  local root = vim.fn.expand(opts.wiki_root or '')
  if root ~= '' then
    if vim.fn.isdirectory(root) == 1 then
      vim.health.ok('wiki_root exists: ' .. root)
    else
      vim.health.warn('wiki_root does not exist: ' .. root)
    end
  end
end

local function filetype_section()
  if vim.fn.exists('#filetypedetect#BufRead#*.wiki') ~= 0
     or vim.filetype.match({ filename = 'test.wiki' }) == 'vimwiki' then
    vim.health.ok('filetype detection for *.wiki is wired up')
  else
    vim.health.warn('filetype detection for *.wiki not active')
  end
end

local function clients()
  return (vim.lsp.get_clients or vim.lsp.get_active_clients)({ name = 'nuwiki' })
end

local function lsp_section()
  local cs = clients()
  if cs and #cs > 0 then
    vim.health.ok('LSP client attached (' .. #cs .. ' instance(s))')
    local cl = cs[1]
    local cmds = vim.tbl_get(
      cl,
      'server_capabilities',
      'executeCommandProvider',
      'commands'
    ) or {}
    if #cmds > 0 then
      vim.health.ok('server advertises ' .. #cmds .. ' executeCommand entries')
    else
      vim.health.info('server has not yet reported executeCommand entries')
    end
    local folding = vim.tbl_get(cl, 'server_capabilities', 'foldingRangeProvider')
    if folding then
      vim.health.ok('server supports textDocument/foldingRange')
    else
      vim.health.info('server has not advertised foldingRange capability')
    end
  else
    vim.health.info('LSP client not yet attached — open a .wiki buffer')
  end
end

local function html_section(opts)
  local html_path = (opts.wikis and opts.wikis[1] and opts.wikis[1].html_path)
    or (opts.wiki_root and (vim.fn.expand(opts.wiki_root) .. '/_html'))
  if not html_path or html_path == '' then
    return
  end
  if vim.fn.isdirectory(html_path) == 1 then
    -- Probe writability with `filewritable` on the directory.
    if vim.fn.filewritable(html_path) == 2 then
      vim.health.ok('html output dir writable: ' .. html_path)
    else
      vim.health.warn('html output dir exists but not writable: ' .. html_path)
    end
  else
    vim.health.info(
      'html output dir does not exist yet (created on first export): ' .. html_path
    )
  end
end

local function mappings_section(opts)
  if opts.mappings and opts.mappings.enabled == false then
    vim.health.info('default keymaps disabled by user config')
    return
  end
  vim.health.ok('default keymaps enabled (subgroups: '
    .. table.concat(vim.tbl_keys(opts.mappings or {}), ',') .. ')')
end

function M.check()
  local config = require('nuwiki.config')
  local opts = config.options or config.defaults

  vim.health.start('nuwiki')
  bin_section()
  wiki_root_section(opts)
  filetype_section()
  lsp_section()
  html_section(opts)
  mappings_section(opts)
end

return M