#!/usr/bin/env python3
"""SenSu ProjectEngine — 异步子进程项目管理"""
import asyncio, os, logging, signal, time
from typing import Dict, Optional, List
from dataclasses import dataclass, field
from datetime import datetime

logger = logging.getLogger(__name__)

@dataclass
class ProjectProcess:
    name: str
    cmd: list
    cwd: str = "."
    env: dict = field(default_factory=dict)
    port: int = 0
    proxy_path: str = ""
    auto_restart: bool = True
    process: asyncio.subprocess.Process = None
    status: str = "stopped"
    pid: int = 0
    started_at: float = 0
    log_buffer: list = field(default_factory=list)  # 最近 200 行
    max_log_lines: int = 200

class ProjectEngine:
    def __init__(self, service_manager=None):
        self.sm = service_manager
        self.projects: Dict[str, ProjectProcess] = {}
        self._monitor_task = None

    async def start(self):
        self._monitor_task = asyncio.create_task(self._health_monitor())
        logger.info("ProjectEngine 已就绪")

    async def run_project(self, name: str, cmd: list, cwd: str = ".",
                          env: dict = None, port: int = 0, proxy_path: str = "",
                          auto_restart: bool = True) -> bool:
        if name in self.projects and self.projects[name].status == "running":
            logger.warning(f"项目 {name} 已在运行")
            return False

        pp = ProjectProcess(name=name, cmd=cmd, cwd=cwd, env=env or {},
                           port=port, proxy_path=proxy_path, auto_restart=auto_restart)
        return await self._start_process(pp)

    async def _start_process(self, pp: ProjectProcess) -> bool:
        try:
            full_env = {**os.environ, **pp.env}
            pp.process = await asyncio.create_subprocess_exec(
                *pp.cmd, cwd=pp.cwd, env=full_env,
                stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE,
                stdin=asyncio.subprocess.PIPE
            )
            pp.pid = pp.process.pid
            pp.status = "running"
            pp.started_at = time.time()
            self.projects[pp.name] = pp

            # 启动日志读取任务
            asyncio.create_task(self._read_stream(pp, pp.process.stdout, "stdout"))
            asyncio.create_task(self._read_stream(pp, pp.process.stderr, "stderr"))

            logger.info(f"项目已启动: {pp.name} (PID={pp.pid})")
            if pp.port:
                logger.info(f"  端口: {pp.port}")
            if pp.proxy_path:
                logger.info(f"  代理: {pp.proxy_path}")

            # 监控进程退出
            asyncio.create_task(self._wait_exit(pp))
            return True
        except Exception as e:
            logger.error(f"启动项目 {pp.name} 失败: {e}")
            pp.status = "error"
            self.projects[pp.name] = pp
            return False

    async def _read_stream(self, pp: ProjectProcess, stream, tag: str):
        while pp.status == "running" and stream and not stream.at_eof():
            try:
                line = await stream.readline()
                if line:
                    text = line.decode(errors="replace").rstrip()
                    pp.log_buffer.append(f"[{tag}] {text}")
                    if len(pp.log_buffer) > pp.max_log_lines:
                        pp.log_buffer = pp.log_buffer[-pp.max_log_lines:]
                    logger.debug(f"[{pp.name}] {text}")
            except Exception:
                break

    async def _wait_exit(self, pp: ProjectProcess):
        if pp.process:
            await pp.process.wait()
            exit_code = pp.process.returncode
            pp.status = "stopped"
            logger.info(f"项目 {pp.name} 已退出 (code={exit_code})")
            if pp.auto_restart and exit_code != 0:
                logger.info(f"自动重启 {pp.name} ...")
                await asyncio.sleep(2)
                await self._start_process(pp)

    async def stop_project(self, name: str) -> bool:
        pp = self.projects.get(name)
        if not pp or pp.status != "running":
            return False
        pp.auto_restart = False
        if pp.process:
            pp.process.terminate()
            try:
                await asyncio.wait_for(pp.process.wait(), timeout=5)
            except asyncio.TimeoutError:
                pp.process.kill()
        pp.status = "stopped"
        logger.info(f"项目已停止: {name}")
        return True

    async def send_stdin(self, name: str, text: str):
        pp = self.projects.get(name)
        if pp and pp.process and pp.process.stdin:
            pp.process.stdin.write((text + "\n").encode())
            await pp.process.stdin.drain()
            return True
        return False

    def get_logs(self, name: str, tail: int = 50) -> List[str]:
        pp = self.projects.get(name)
        return pp.log_buffer[-tail:] if pp else []

    def list_projects(self) -> List[dict]:
        return [{"name": p.name, "status": p.status, "pid": p.pid,
                 "port": p.port, "proxy": p.proxy_path,
                 "uptime": int(time.time()-p.started_at) if p.started_at else 0}
                for p in self.projects.values()]

    def get_project(self, name: str) -> Optional[ProjectProcess]:
        return self.projects.get(name)

    async def _health_monitor(self):
        while True:
            await asyncio.sleep(10)
            for pp in list(self.projects.values()):
                if pp.status == "running" and pp.process:
                    if pp.process.returncode is not None:
                        pp.status = "stopped"
                        logger.warning(f"项目 {pp.name} 异常退出 (code={pp.process.returncode})")

    async def shutdown(self):
        for name in list(self.projects.keys()):
            await self.stop_project(name)
        if self._monitor_task:
            self._monitor_task.cancel()
        logger.info("ProjectEngine 已关闭")