#!/usr/bin/env bash
# ============================================================
# spec-coding-skills 安装/更新脚本
# 用法: bash <(curl -sL <raw-url>/install.sh)
#   或: bash install.sh [目标目录]
# ============================================================
set -euo pipefail

REPO_URL="https://git.internal.intelligrow.cn/zhangfucai/spec-coding-skills.git"
SKILLS_SRC=".claude/skills"
DEFAULT_TARGET=".claude/skills"

GREEN='\033[0;32m'; YELLOW='\033[1;33m'; CYAN='\033[0;36m'; NC='\033[0m'
log_info()  { echo -e "${GREEN}[INFO]${NC}  $1"; }
log_warn()  { echo -e "${YELLOW}[WARN]${NC}  $1"; }
log_title() { echo -e "${CYAN}$1${NC}"; }

TARGET="${1:-$DEFAULT_TARGET}"
TMP_DIR=$(mktemp -d)
trap "rm -rf $TMP_DIR" EXIT

# ---------- 拉取最新 ----------
log_title "📦 spec-coding-skills 安装/更新"
echo ""
log_info "拉取最新版本..."
git clone --depth 1 --quiet "$REPO_URL" "$TMP_DIR"

VERSION=$(git -C "$TMP_DIR" describe --tags --always 2>/dev/null || git -C "$TMP_DIR" rev-parse --short HEAD)
log_info "版本: $VERSION"

# ---------- 统计变更 ----------
NEW=0
UPDATED=0
SKIPPED=0
KEPT=0

mkdir -p "$TARGET"

# 遍历上游 skill 目录
for skill_dir in "$TMP_DIR/$SKILLS_SRC"/*/; do
  [ -d "$skill_dir" ] || continue
  skill_name=$(basename "$skill_dir")
  src_file="$skill_dir/SKILL.md"
  dst_dir="$TARGET/$skill_name"
  dst_file="$dst_dir/SKILL.md"

  [ -f "$src_file" ] || continue

  if [ ! -f "$dst_file" ]; then
    # 新 skill，直接复制
    mkdir -p "$dst_dir"
    cp "$src_file" "$dst_file"
    log_info "✨ 新增: $skill_name"
    NEW=$((NEW + 1))
  elif diff -q "$src_file" "$dst_file" >/dev/null 2>&1; then
    # 内容一致，跳过
    SKIPPED=$((SKIPPED + 1))
  else
    # 内容不同：上游有更新 或 用户本地修改过
    # 策略：备份本地版本，写入上游新版本
    cp "$dst_file" "$dst_file.local.bak"
    cp "$src_file" "$dst_file"
    log_warn "🔄 更新: $skill_name （本地版本已备份为 SKILL.md.local.bak）"
    UPDATED=$((UPDATED + 1))
  fi
done

# 复制模板文件（非 skill 目录的文件）
for tpl_file in "$TMP_DIR/$SKILLS_SRC"/*.template "$TMP_DIR/$SKILLS_SRC"/*.md; do
  [ -f "$tpl_file" ] || continue
  tpl_name=$(basename "$tpl_file")
  dst="$TARGET/$tpl_name"

  if [ ! -f "$dst" ]; then
    cp "$tpl_file" "$dst"
    log_info "✨ 新增模板: $tpl_name"
    NEW=$((NEW + 1))
  elif ! diff -q "$tpl_file" "$dst" >/dev/null 2>&1; then
    cp "$dst" "$dst.local.bak"
    cp "$tpl_file" "$dst"
    log_warn "🔄 更新模板: $tpl_name （本地版本已备份为 ${tpl_name}.local.bak）"
    UPDATED=$((UPDATED + 1))
  else
    SKIPPED=$((SKIPPED + 1))
  fi
done

# ---------- 汇总 ----------
echo ""
log_title "✅ 完成！"
echo ""
echo "  📁 目标目录: $TARGET"
echo "  📦 版本:     $VERSION"
echo ""
echo "  ✨ 新增: $NEW"
echo "  🔄 更新: $UPDATED（本地版本已备份为 .local.bak）"
echo "  ⏭️  无变化: $SKIPPED"
echo ""

if [ "$UPDATED" -gt 0 ]; then
  log_warn "有 $UPDATED 个文件被更新，本地修改已备份为 .local.bak"
  log_warn "如需恢复本地版本: mv SKILL.md.local.bak SKILL.md"
  log_warn "如需对比差异:     diff SKILL.md SKILL.md.local.bak"
fi