#!/bin/sh
# Post-receive hook: push 后自动 build + start

# pnpm 环境变量
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion

# 全局变量统一声明。具体值由各步骤函数写入。
REPO_TOPLEVEL=""
LOG_FILE=""
CURRENT_BRANCH=""
START_PORT=""
BUILD_EXIT=0

resolve_repo_context() {
    GIT_DIR_ABS="$(git rev-parse --absolute-git-dir 2>/dev/null)"
    if [ -n "$GIT_DIR_ABS" ] && [ -d "$GIT_DIR_ABS" ]; then
        REPO_TOPLEVEL="$(cd "$GIT_DIR_ABS/.." && pwd)"
        export GIT_DIR="$GIT_DIR_ABS"
    else
        REPO_TOPLEVEL="$(git rev-parse --show-toplevel 2>/dev/null || echo "$PWD")"
    fi
    unset GIT_WORK_TREE
    cd "$REPO_TOPLEVEL" || { echo "FATAL: cannot cd to $REPO_TOPLEVEL" >&2; exit 1; }
    echo "=== REPO_TOPLEVEL=$REPO_TOPLEVEL (GIT_DIR=$GIT_DIR) ===" >&2
}

init_log_file() {
    LOG_FILE="$REPO_TOPLEVEL/logs/post-receive.log"
    mkdir -p "$(dirname "$LOG_FILE")"
}

write_metadata_header() {
    {
        echo "=== post-receive @ $(date +%Y-%m-%dT%H:%M:%S%z) ==="
        echo "branch:  $(git rev-parse --abbrev-ref HEAD)"
        echo "commit:  $(git rev-parse --short HEAD)"
        echo "cwd:     $(pwd)"
        echo ""
    } > "$LOG_FILE"
}

sync_worktree() {
    echo "=== sync_worktree: git reset --hard HEAD @ $(date +%Y-%m-%dT%H:%M:%S%z) ==="
    git reset --hard HEAD
}

copy_env_by_branch() {
    CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
    echo "=== branch: $CURRENT_BRANCH ===" >> "$LOG_FILE"
    case "$CURRENT_BRANCH" in
        main)
            cp -f env-example/.env.production.example .env.production
            echo "=== env: copied .env.production (main → prod) ===" >> "$LOG_FILE"
            ;;
        test)
            cp -f env-example/.env.local.example .env.local
            echo "=== env: copied .env.local (test → test) ===" >> "$LOG_FILE"
            ;;
        dev)
            cp -f env-example/.env.development.example .env.local
            echo "=== env: copied .env.local (dev → dev) ===" >> "$LOG_FILE"
            ;;
        *)
            echo "=== env: UNKNOWN branch '$CURRENT_BRANCH', skip env copy ===" >> "$LOG_FILE"
            ;;
    esac
}

# ============================================================
# 4. select_port_by_branch —— 根据分支选择 next start 端口
#   main 分支 → 9185
#   test 分支 → 9135
#   dev 分支  → 9135
# ============================================================
select_port_by_branch() {
    case "$CURRENT_BRANCH" in
        main)
            START_PORT=9185
            ;;
        test|dev)
            START_PORT=9135
            ;;
        *)
            START_PORT=9135
            ;;
    esac
    export START_PORT
    echo "=== start port: $START_PORT ===" >> "$LOG_FILE"
}

# ============================================================
# 5. run_build —— 跑 `pnpm install` + `pnpm run build`，输出丢，捕获退出码写日志
#   返回：build 退出码（main 用 if ! run_build 决定是否继续）
# ============================================================
run_build() {
    echo "=== build START @ $(date +%Y-%m-%dT%H:%M:%S%z) ===" >> "$LOG_FILE"
    pnpm run build:deploy > /dev/null 2>&1
    BUILD_EXIT=$?
    echo "=== build EXIT_CODE=$BUILD_EXIT @ $(date +%Y-%m-%dT%H:%M:%S%z) ===" >> "$LOG_FILE"
    echo "" >> "$LOG_FILE"
    return $BUILD_EXIT
}

# ============================================================
# 6. stop_existing_next —— 仅停止当前分支端口上的旧进程
#   1) 优雅关闭（SIGTERM）—— 旧进程自己 drain
#   2) 等 2s
#   3) 强杀（SIGKILL）—— 还在的话
#   4) 等 1s
# ============================================================
stop_existing_next() {
    echo "=== stop existing next on port $START_PORT @ $(date +%Y-%m-%dT%H:%M:%S%z) ===" >> "$LOG_FILE"
    PIDS=""
    if command -v lsof >/dev/null 2>&1; then
        PIDS="$(lsof -ti tcp:"$START_PORT" 2>/dev/null || true)"
    elif command -v fuser >/dev/null 2>&1; then
        PIDS="$(fuser "$START_PORT"/tcp 2>/dev/null || true)"
    else
        pkill -f "next start.*$START_PORT" 2>/dev/null || true
    fi

    if [ -n "$PIDS" ]; then
        kill $PIDS 2>/dev/null || true
    fi
    sleep 2
    if [ -n "$PIDS" ]; then
        kill -9 $PIDS 2>/dev/null || true
    fi
    sleep 1
    echo "=== stop DONE @ $(date +%Y-%m-%dT%H:%M:%S%z) ===" >> "$LOG_FILE"
    echo "" >> "$LOG_FILE"
}

launch_next() {
    echo "=== start LAUNCH port=$START_PORT @ $(date +%Y-%m-%dT%H:%M:%S%z) ===" >> "$LOG_FILE"
    PORT="$START_PORT" nohup pnpm run start >> "$LOG_FILE" 2>&1 &
    START_PID=$!
    echo "=== start PID=$START_PID @ $(date +%Y-%m-%dT%H:%M:%S%z) ===" >> "$LOG_FILE"
}

# ============================================================
# 8. log_abort —— build 失败时写结束标记（不输出 START LAUNCH）
# ============================================================
log_abort() {
    echo "=== ABORTED @ $(date +%Y-%m-%dT%H:%M:%S%z) (build failed, start skipped) ===" >> "$LOG_FILE"
}

# ============================================================
# main —— 调度所有步骤
# ============================================================
main() {
    resolve_repo_context
    init_log_file
    write_metadata_header    # 先覆盖写元信息（这样 env copy 日志能保留在后面）

    sync_worktree            # 先同步工作树到新 HEAD（与 git config denyCurrentBranch 配合）
    copy_env_by_branch       # 追加 env copy 日志

    select_port_by_branch    # 根据当前分支决定 next start 端口

    if ! run_build; then
        log_abort
        exit $BUILD_EXIT       # build 失败 → 不启 start（避免用旧 .next 跑新代码）
    fi

    stop_existing_next        # build 成功 → 先关旧进程
    launch_next               # 再启新
}

main "$@"

exit 0