#!/usr/bin/env bash
#
# start-vim.sh — launch Vim with a minimal config that loads nuwiki.
#
# The plugin's Vim path (autoload/nuwiki/lsp.vim) prefers `vim-lsp` and
# falls back to `coc.nvim`. This script clones vim-lsp + async.vim into
# the dev cache on first run so the LSP integration is exercisable
# without polluting your real Vim install.
#
# Usage: ./start-vim.sh [extra args...]
#   ./start-vim.sh                        # open the scratch wiki's index
#   ./start-vim.sh path/to/note.wiki      # open a specific file
#   NUWIKI_DEV_WIKI=/tmp/foo ./start-vim.sh
#   NUWIKI_DEV_NO_LSP=1 ./start-vim.sh        # skip vim-lsp setup
#   NUWIKI_DEV_SKIP_BUILD=1 ./start-vim.sh    # reuse the cached binary
#
# The release binary is rebuilt on every launch so source changes
# always reach the running LSP. `cargo build --release` is incremental,
# so this is a fast no-op when nothing changed. Set
# NUWIKI_DEV_SKIP_BUILD=1 to skip the build step entirely.
#
# Tested with Vim 9.1+. State (viminfo/sessions) lives under
# $XDG_CACHE_HOME/nuwiki-dev/ so your real Vim install stays untouched.

set -euo pipefail

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DEV_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/nuwiki-dev"
WIKI_DIR="${NUWIKI_DEV_WIKI:-$DEV_DIR/wiki}"
VIMRC="$DEV_DIR/vimrc"
VIM_STATE="$DEV_DIR/vim-state"
VIM_LSP_DIR="$DEV_DIR/vim-lsp"
ASYNC_DIR="$DEV_DIR/async.vim"

log() { printf '\033[1;34m[nuwiki-dev]\033[0m %s\n' "$*"; }

ensure_binary() {
  local bin="$REPO_ROOT/bin/nuwiki-ls"
  local built="$REPO_ROOT/target/release/nuwiki-ls"
  if [[ "${NUWIKI_DEV_SKIP_BUILD:-0}" == "1" ]]; then
    if [[ ! -x "$bin" ]]; then
      log "NUWIKI_DEV_SKIP_BUILD=1 but $bin is missing — building anyway"
    else
      log "NUWIKI_DEV_SKIP_BUILD=1 — using existing $bin"
      return
    fi
  fi
  log "building nuwiki-ls (release)…"
  cargo build --release -p nuwiki-ls --manifest-path "$REPO_ROOT/Cargo.toml"
  mkdir -p "$REPO_ROOT/bin"
  ln -sf "$built" "$bin"
  log "binary ready: $bin (built $(date -r "$built" '+%Y-%m-%d %H:%M:%S'))"
}

clone_if_missing() {
  local repo_url="$1"
  local dest="$2"
  if [[ -d "$dest/.git" ]]; then
    return
  fi
  if ! command -v git >/dev/null 2>&1; then
    log "git not found — skipping $repo_url"
    return 1
  fi
  log "cloning $repo_url → $dest"
  git clone --depth 1 "$repo_url" "$dest" >/dev/null 2>&1
}

ensure_vim_lsp() {
  if [[ "${NUWIKI_DEV_NO_LSP:-0}" == "1" ]]; then
    log "NUWIKI_DEV_NO_LSP=1 — skipping vim-lsp setup"
    return
  fi
  mkdir -p "$DEV_DIR"
  clone_if_missing https://github.com/prabirshrestha/vim-lsp.git "$VIM_LSP_DIR" || true
  clone_if_missing https://github.com/prabirshrestha/async.vim.git "$ASYNC_DIR" || true
}

seed_wiki() {
  mkdir -p "$WIKI_DIR" "$WIKI_DIR/diary"
  if [[ ! -f "$WIKI_DIR/index.wiki" ]]; then
    cat > "$WIKI_DIR/index.wiki" <<'EOF'
= Welcome to nuwiki =

This is a scratch wiki created by start-vim.sh. Edit, run commands,
or jump to the linked pages to test the plugin.

== Smoke test ==

- [[Notes]]
- [[diary/]]
- [ ] Toggle me with :VimwikiToggleListItem
- [ ] Inspect the LSP via :LspStatus

== Commands to try ==

- :VimwikiTOC
- :VimwikiGenerateLinks
- :VimwikiCheckLinks
- :VimwikiMakeDiaryNote

== Tags ==

:smoke-test:sandbox:
EOF
  fi
  if [[ ! -f "$WIKI_DIR/Notes.wiki" ]]; then
    cat > "$WIKI_DIR/Notes.wiki" <<'EOF'
= Notes =

A second page so [[index]] has somewhere to point.

== Section one ==

Anchor target for cross-page link follows.
EOF
  fi
}

write_vimrc() {
  mkdir -p "$DEV_DIR"
  cat > "$VIMRC" <<EOF
" start-vim.sh: generated minimal config for nuwiki development.
" Regenerated on every launch; edit start-vim.sh, not this file.

" Confine state to the dev cache so we never touch the user's real Vim
" install.
set viminfo='100,n$VIM_STATE/viminfo
let &directory = '$VIM_STATE/swap//'
let &backupdir = '$VIM_STATE/backup//'
let &undodir = '$VIM_STATE/undo//'

" Make Vim look for runtime paths in the dev cache.
set nocompatible
let &runtimepath = '$REPO_ROOT' . ',' . &runtimepath
let &runtimepath .= ',$VIM_LSP_DIR'
let &runtimepath .= ',$ASYNC_DIR'

let g:nuwiki_binary_path  = '$REPO_ROOT/bin/nuwiki-ls'
let g:nuwiki_wiki_root    = '$WIKI_DIR'
let g:nuwiki_file_extension = '.wiki'
let g:nuwiki_syntax       = 'vimwiki'
let g:nuwiki_log_level    = 'info'

filetype plugin indent on
syntax enable
set hidden
set termguicolors
set number
set signcolumn=yes
set noswapfile
set nobackup
set nowritebackup
let mapleader = ' '

" Auto-detect filetype for .wiki files (the plugin ships ftdetect, but
" --clean disables those — copy the rule here).
augroup NuwikiFtdetect
  autocmd!
  autocmd BufRead,BufNewFile *.wiki setfiletype vimwiki
augroup END

" If vim-lsp is on the runtimepath, the plugin's autoload entry point
" registers the server automatically. Triggering it on FileType keeps
" the script's responsibility minimal.
augroup NuwikiStart
  autocmd!
  autocmd FileType vimwiki call nuwiki#lsp#start()
augroup END

" Status messages go to :messages so they don't trigger "Press ENTER".
echomsg '[nuwiki-dev] ready — wiki root: $WIKI_DIR'
echomsg '[nuwiki-dev] :LspStatus for diagnostics, :messages for log'
EOF
}

main() {
  ensure_binary
  ensure_vim_lsp
  seed_wiki
  write_vimrc
  mkdir -p "$VIM_STATE/swap" "$VIM_STATE/backup" "$VIM_STATE/undo"

  log "launching: vim --clean -u $VIMRC"
  if [[ $# -gt 0 ]]; then
    exec vim --clean -u "$VIMRC" "$@"
  else
    exec vim --clean -u "$VIMRC" "$WIKI_DIR/index.wiki"
  fi
}

main "$@"