#!/usr/bin/env bash
# sync-ai-instructions.sh
# Génère ~/.claude/CLAUDE.md et ~/.codex/AGENTS.md (symlink) depuis _AI_INSTRUCTIONS.md
# Ces fichiers sont globaux à la machine — ils ne vivent PAS dans le repo Lead_tech

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
SOURCE="$REPO_ROOT/_AI_INSTRUCTIONS.md"

# --- Détection machine ---
OS="$(uname -s)"
CHANGED=0
SKILLS_SOURCE_DIR="$REPO_ROOT/skills"

generate_repo_claude() {
  local header="$1"
  local dest="$2"
  local tmp

  tmp="$(mktemp)"

  mkdir -p "$(dirname "$dest")"

  {
    echo "$header"
    echo ""
    sed "s|{{LEADTECH}}|$REPO_ROOT|g" "$SOURCE"
  } > "$tmp"

  if [ ! -f "$dest" ] || ! cmp -s "$tmp" "$dest"; then
    mv "$tmp" "$dest"
    CHANGED=1
  else
    rm -f "$tmp"
  fi
}

ensure_symlink() {
  local target="$1"
  local link_path="$2"

  mkdir -p "$(dirname "$link_path")"

  if [ -L "$link_path" ]; then
    local current_target
    current_target="$(readlink "$link_path")"
    if [ "$current_target" = "$target" ] && [ -e "$link_path" ]; then
      return 0
    fi
    rm -f "$link_path"
  elif [ -e "$link_path" ]; then
    rm -f "$link_path"
  fi

  ln -s "$target" "$link_path"
  CHANGED=1
}

sync_skills_for_target() {
  local target_root="$1"
  local source_dir="$2"
  local skill_dir
  local skill_name
  local target_link

  mkdir -p "$target_root"
  [ -d "$source_dir" ] || return 0

  for skill_dir in "$source_dir"/*; do
    [ -d "$skill_dir" ] || continue
    [ -f "$skill_dir/SKILL.md" ] || continue

    skill_name="$(basename "$skill_dir")"
    target_link="$target_root/$skill_name"

    if [ -L "$target_link" ]; then
      local current_target
      current_target="$(readlink "$target_link")"
      if [ "$current_target" = "$skill_dir" ] && [ -e "$target_link" ]; then
        continue
      fi
      rm -f "$target_link"
    elif [ -e "$target_link" ]; then
      echo "WARN: skill déjà présent et non symlink, conservé: $target_link" >&2
      continue
    fi

    ln -s "$skill_dir" "$target_link"
    CHANGED=1
  done
}

CLAUDE_HEADER="# Instructions globales — Lead Tech Copilote

Ce fichier est chargé automatiquement par Claude Code ou Codex à chaque session.
Il constitue la porte d'entrée principale de la base de connaissance Lead_tech et oriente vers les fichiers spécialisés utilisés par tous les projets."

generate_repo_claude "$CLAUDE_HEADER" "$HOME/.claude/CLAUDE.md"

ensure_symlink "$HOME/.claude/CLAUDE.md" "$HOME/.codex/AGENTS.md"
sync_skills_for_target "$HOME/.claude/skills" "$SKILLS_SOURCE_DIR"
sync_skills_for_target "$HOME/.codex/skills" "$SKILLS_SOURCE_DIR"

if [ "$CHANGED" -eq 1 ]; then
  echo "Sync AI instructions (OS: $OS)"
  echo "Sync terminée."
fi