#!/bin/bash
# system-dev-template installer
# 已有專案接入腳本——只建立缺少的東西，已有的一律不動

set -e

REPO_URL="https://raw.githubusercontent.com/uncle6me-web/system-dev-template/main/template"
CREATED=()
SKIPPED=()

echo ""
echo "🔧 system-dev-template installer"
echo "================================="
echo "只建立缺少的目錄和檔案，已有的不動。"
echo ""

# ── 目錄 ──────────────────────────────────────────

create_dir() {
  if [ ! -d "$1" ]; then
    mkdir -p "$1"
    CREATED+=("$1/")
  else
    SKIPPED+=("$1/ (已存在)")
  fi
}

create_dir "docs/1-vision"
create_dir "docs/2-architecture/decisions"
create_dir "docs/3-specs"
create_dir "docs/4-guides"
create_dir "docs/5-records/incidents"
create_dir "docs/5-records/test-reports"
create_dir "docs/6-user"
create_dir ".claude/wiki"
create_dir ".claude/commands"
create_dir ".claude/hooks"

# ── 檔案（從 repo 下載，只在不存在時）──────────────

download_if_missing() {
  local dest="$1"
  local src="$2"
  if [ ! -f "$dest" ]; then
    curl -sSL "$src" -o "$dest"
    CREATED+=("$dest")
  else
    SKIPPED+=("$dest (已存在，跳過)")
  fi
}

# wiki 核心檔案
download_if_missing ".claude/wiki/INDEX.md"             "$REPO_URL/.claude/wiki/INDEX.md"
download_if_missing ".claude/wiki/status.md"            "$REPO_URL/.claude/wiki/status.md"
download_if_missing ".claude/wiki/mistakes.md"          "$REPO_URL/.claude/wiki/mistakes.md"
download_if_missing ".claude/wiki/decisions-summary.md" "$REPO_URL/.claude/wiki/decisions-summary.md"

# slash commands
download_if_missing ".claude/commands/wiki-init.md"     "$REPO_URL/.claude/commands/wiki-init.md"
download_if_missing ".claude/commands/wiki-capture.md"  "$REPO_URL/.claude/commands/wiki-capture.md"
download_if_missing ".claude/commands/wiki-update.md"   "$REPO_URL/.claude/commands/wiki-update.md"
download_if_missing ".claude/commands/wiki-recall.md"   "$REPO_URL/.claude/commands/wiki-recall.md"
download_if_missing ".claude/commands/sdd-check.md"     "$REPO_URL/.claude/commands/sdd-check.md"

# hooks（軟規範 → 硬攔截。下載後補執行權限）
download_if_missing ".claude/hooks/session-start-recall.sh" "$REPO_URL/.claude/hooks/session-start-recall.sh"
download_if_missing ".claude/hooks/sdd-guard.sh"            "$REPO_URL/.claude/hooks/sdd-guard.sh"
download_if_missing ".claude/hooks/pre-write-guard.sh"      "$REPO_URL/.claude/hooks/pre-write-guard.sh"
chmod +x .claude/hooks/*.sh 2>/dev/null || true

# docs/README.md（分類地圖）
download_if_missing "docs/README.md" "$REPO_URL/docs/README.md"

# CLAUDE.md：只在完全不存在時建立
if [ ! -f "CLAUDE.md" ]; then
  download_if_missing "CLAUDE.md" "$REPO_URL/CLAUDE.md"
else
  SKIPPED+=("CLAUDE.md (已存在，請手動加入 wiki 讀取順序區塊)")
fi

# .claude/settings.json：只在完全不存在時建立（比照 CLAUDE.md，不覆蓋既有設定）
if [ ! -f ".claude/settings.json" ]; then
  download_if_missing ".claude/settings.json" "$REPO_URL/.claude/settings.json"
else
  SKIPPED+=(".claude/settings.json (已存在，請手動加入 hooks 區塊)")
fi

# ── 輸出結果 ──────────────────────────────────────

echo ""
echo "✅ 建立了："
for item in "${CREATED[@]}"; do
  echo "   + $item"
done

if [ ${#SKIPPED[@]} -gt 0 ]; then
  echo ""
  echo "⚠️  跳過（已存在）："
  for item in "${SKIPPED[@]}"; do
    echo "   - $item"
  done
fi

echo ""
echo "─────────────────────────────────"

# 如果 CLAUDE.md 已存在，提醒手動加入 wiki 區塊
if [ -f "CLAUDE.md" ]; then
  if ! grep -q "wiki/status.md" CLAUDE.md; then
    echo ""
    echo "📌 CLAUDE.md 已存在但缺少 wiki 讀取順序。"
    echo "   請手動加入以下區塊："
    echo ""
    echo '   ## Wiki 讀取順序'
    echo '   | 檔案 | 時機 | 用途 |'
    echo '   |------|------|------|'
    echo '   | `.claude/wiki/status.md` | session 開始第一件事 | 當前進度 |'
    echo '   | `.claude/wiki/mistakes.md` | 做新功能前 | 已知誤解 |'
    echo '   | `.claude/wiki/decisions-summary.md` | 設計判斷時 | 架構決策 |'
  fi
fi

# 如果 settings.json 已存在，提醒手動加入 hooks 區塊
if [ -f ".claude/settings.json" ]; then
  if ! grep -q "session-start-recall.sh" .claude/settings.json; then
    echo ""
    echo "📌 .claude/settings.json 已存在但缺少 hooks。"
    echo "   請手動把以下 hooks 合併進去（已有設定請保留）："
    echo ""
    echo '   "SessionStart": [{ "matcher": "startup|resume|clear",'
    echo '     "hooks": [{ "type": "command", "command": ".claude/hooks/session-start-recall.sh" }] }],'
    echo '   "PreToolUse": [{ "matcher": "Write|Edit",'
    echo '     "hooks": [{ "type": "command", "command": ".claude/hooks/sdd-guard.sh" },'
    echo '               { "type": "command", "command": ".claude/hooks/pre-write-guard.sh" }] }]'
  fi
fi

echo ""
echo "🚀 下一步：在 Claude Code 對話裡執行："
echo "   /wiki-init"
echo ""
echo "   CC 會掃描現有文件、建立 wiki、整理 docs 結構。"
echo ""