#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Warp Protobuf 桥接服务器启动文件

提供 Warp API 桥接端点（/api/warp/send_stream、/api/warp/send_stream_sse）、/healthz 与 /v1/models。已移除 GUI、静态文件与 WebSocket 功能。
"""

import os
import asyncio
import json
from pathlib import Path

import uvicorn
from fastapi import FastAPI, HTTPException
from contextlib import asynccontextmanager
# 新增：类型导入
from typing import Any, Dict, List

from warp2protobuf.api.protobuf_routes import app as protobuf_app
from warp2protobuf.core.logging import logger

from warp2protobuf.core.auth import acquire_anonymous_access_token
from warp2protobuf.config.models import get_all_unique_models

# 导入OpenAI兼容路由
from protobuf2openai.router import router as openai_router


# ============= JSON Schema 清理函数已移至 warp2protobuf.core.schema_sanitizer 模块 =============


# ============= 应用创建 =============

def create_app() -> FastAPI:
    """创建FastAPI应用"""
    
    # 使用protobuf路由的应用作为主应用
    app = protobuf_app

    # 挂载OpenAI兼容路由
    app.include_router(openai_router)

    # 挂载输入 schema 清理中间件（覆盖 Warp 相关端点）

    


    # ============= OpenAI 兼容：模型列表接口（通过router提供） =============

    return app


def create_app_with_lifespan() -> FastAPI:
    """创建带有lifespan事件处理的FastAPI应用"""
    app = FastAPI(
        title="Warp Protobuf Bridge Server",
        description="Warp API 桥接服务器，提供 Protobuf 编解码与 OpenAI 兼容接口",
        version="1.0.0",
        lifespan=lifespan
    )

    # 添加CORS中间件
    from fastapi.middleware.cors import CORSMiddleware
    app.add_middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    # 挂载子应用
    app.mount("/api", protobuf_app)

    # 包含OpenAI兼容路由
    app.include_router(openai_router)

    # ============= 根路径与健康检查 =============
    @app.get("/")
    async def root():
        return {
            "service": "Warp Protobuf Bridge Server",
            "status": "running",
            "endpoints": {
                "health": "/healthz",
                "models": "/v1/models",
                "protobuf_bridge": "/api/warp/send_stream",
                "sse_bridge": "/api/warp/send_stream_sse",
                "auth_refresh": "/api/auth/refresh"
            }
        }

    @app.get("/healthz")
    async def health_check():
        return {"status": "ok", "service": "Warp Protobuf Bridge Server"}

    return app


############################################################
# server_message_data 深度编解码工具
############################################################

# 说明：
# 根据抓包与分析，server_message_data 是 Base64URL 编码的 proto3 消息：
#   - 字段 1：string（通常为 36 字节 UUID）
#   - 字段 3：google.protobuf.Timestamp（字段1=seconds，字段2=nanos）
# 可能出现：仅 Timestamp、仅 UUID、或 UUID + Timestamp。

from typing import Dict, Optional, Tuple
import base64
from datetime import datetime, timezone
try:
    from zoneinfo import ZoneInfo  # Python 3.9+
except Exception:
    ZoneInfo = None  # type: ignore


def _b64url_decode_padded(s: str) -> bytes:
    t = s.replace("-", "+").replace("_", "/")
    pad = (-len(t)) % 4
    if pad:
        t += "=" * pad
    return base64.b64decode(t)


def _b64url_encode_nopad(b: bytes) -> str:
    return base64.urlsafe_b64encode(b).decode("ascii").rstrip("=")


def _read_varint(buf: bytes, i: int) -> Tuple[int, int]:
    shift = 0
    val = 0
    while i < len(buf):
        b = buf[i]
        i += 1
        val |= (b & 0x7F) << shift
        if not (b & 0x80):
            return val, i
        shift += 7
        if shift > 63:
            break
    raise ValueError("invalid varint")


def _write_varint(v: int) -> bytes:
    out = bytearray()
    vv = int(v)
    while True:
        to_write = vv & 0x7F
        vv >>= 7
        if vv:
            out.append(to_write | 0x80)
        else:
            out.append(to_write)
            break
    return bytes(out)


def _make_key(field_no: int, wire_type: int) -> bytes:
    return _write_varint((field_no << 3) | wire_type)


def _decode_timestamp(buf: bytes) -> Tuple[Optional[int], Optional[int]]:
    # google.protobuf.Timestamp: field 1 = seconds (int64 varint), field 2 = nanos (int32 varint)
    i = 0
    seconds: Optional[int] = None
    nanos: Optional[int] = None
    while i < len(buf):
        key, i = _read_varint(buf, i)
        field_no = key >> 3
        wt = key & 0x07
        if wt == 0:  # varint
            val, i = _read_varint(buf, i)
            if field_no == 1:
                seconds = int(val)
            elif field_no == 2:
                nanos = int(val)
        elif wt == 2:  # length-delimited (not expected inside Timestamp)
            ln, i2 = _read_varint(buf, i)
            i = i2 + ln
        elif wt == 1:
            i += 8
        elif wt == 5:
            i += 4
        else:
            break
    return seconds, nanos


def _encode_timestamp(seconds: Optional[int], nanos: Optional[int]) -> bytes:
    parts = bytearray()
    if seconds is not None:
        parts += _make_key(1, 0)  # field 1, varint
        parts += _write_varint(int(seconds))
    if nanos is not None:
        parts += _make_key(2, 0)  # field 2, varint
        parts += _write_varint(int(nanos))
    return bytes(parts)


def decode_server_message_data(b64url: str) -> Dict:
    """解码 Base64URL 的 server_message_data，返回结构化信息。"""
    try:
        raw = _b64url_decode_padded(b64url)
    except Exception as e:
        return {"error": f"base64url decode failed: {e}", "raw_b64url": b64url}

    i = 0
    uuid: Optional[str] = None
    seconds: Optional[int] = None
    nanos: Optional[int] = None

    while i < len(raw):
        key, i = _read_varint(raw, i)
        field_no = key >> 3
        wt = key & 0x07
        if wt == 2:  # length-delimited
            ln, i2 = _read_varint(raw, i)
            i = i2
            data = raw[i:i+ln]
            i += ln
            if field_no == 1:  # uuid string
                try:
                    uuid = data.decode("utf-8")
                except Exception:
                    uuid = None
            elif field_no == 3:  # google.protobuf.Timestamp
                seconds, nanos = _decode_timestamp(data)
        elif wt == 0:  # varint -> not expected, skip
            _, i = _read_varint(raw, i)
        elif wt == 1:
            i += 8
        elif wt == 5:
            i += 4
        else:
            break

    out: Dict[str, Any] = {}
    if uuid is not None:
        out["uuid"] = uuid
    if seconds is not None:
        out["seconds"] = seconds
    if nanos is not None:
        out["nanos"] = nanos
    return out


def encode_server_message_data(uuid: str = None, seconds: int = None, nanos: int = None) -> str:
    """将 uuid/seconds/nanos 组合编码为 Base64URL 字符串。"""
    parts = bytearray()
    if uuid:
        b = uuid.encode("utf-8")
        parts += _make_key(1, 2)  # field 1, length-delimited
        parts += _write_varint(len(b))
        parts += b

    if seconds is not None or nanos is not None:
        ts = _encode_timestamp(seconds, nanos)
        parts += _make_key(3, 2)  # field 3, length-delimited
        parts += _write_varint(len(ts))
        parts += ts

    return _b64url_encode_nopad(bytes(parts))


async def startup_tasks():
    """启动时执行的任务"""
    logger.info("="*60)
    logger.info("Warp Protobuf编解码服务器启动")
    logger.info("="*60)
    
    # 检查protobuf运行时
    try:
        from warp2protobuf.core.protobuf import ensure_proto_runtime
        ensure_proto_runtime()
        logger.info("✅ Protobuf运行时初始化成功")
    except Exception as e:
        logger.error(f"❌ Protobuf运行时初始化失败: {e}")
        raise
    
    # 检查JWT token
    try:
        from warp2protobuf.core.auth import get_jwt_token, is_token_expired, refresh_jwt_if_needed
        token = get_jwt_token()
        if token and not is_token_expired(token):
            logger.info("✅ JWT token有效")
        elif not token:
            logger.warning("⚠️ 未找到JWT token，尝试申请匿名访问token用于额度初始化…")
            try:
                new_token = await acquire_anonymous_access_token()
                if new_token:
                    logger.info("✅ 匿名访问token申请成功")
                else:
                    logger.warning("⚠️ 匿名访问token申请失败")
            except Exception as e2:
                logger.warning(f"⚠️ 匿名访问token申请异常: {e2}")
        else:
            logger.warning("⚠️ JWT token无效或已过期，尝试自动刷新…")
            try:
                refresh_success = await refresh_jwt_if_needed()
                if refresh_success:
                    logger.info("✅ JWT token自动刷新成功")
                else:
                    logger.warning("⚠️ JWT token自动刷新失败，建议手动运行: uv run refresh_jwt.py")
            except Exception as e3:
                logger.warning(f"⚠️ JWT token自动刷新异常: {e3}，建议手动运行: uv run refresh_jwt.py")
    except Exception as e:
        logger.warning(f"⚠️ JWT检查失败: {e}")
    
    # OpenAI 兼容层已集成到当前服务器中
    
    # 显示可用端点
    logger.info("-"*40)
    logger.info("可用的API端点:")
    logger.info("  GET  /                   - 服务信息")
    logger.info("  GET  /healthz            - 健康检查")
    logger.info("  GET  /v1/models          - 模型列表（OpenAI兼容）")
    logger.info("  POST /api/warp/send_stream      - Warp API 转发（返回解析事件）")
    logger.info("  POST /api/warp/send_stream_sse  - Warp API 转发（实时SSE）")
    logger.info("  POST /api/auth/refresh   - 刷新JWT token")
    logger.info("="*60)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """应用生命周期管理"""
    # 启动时执行
    await startup_tasks()
    yield
    # 关闭时执行（如果需要的话）


def main():
    """主函数"""
    # 创建应用（使用lifespan）
    app = create_app_with_lifespan()

    # 启动服务器
    try:
        uvicorn.run(
            app,
            host="0.0.0.0",
            port=8000,
            log_level="info",
            access_log=True
        )
    except KeyboardInterrupt:
        logger.info("服务器被用户停止")
    except Exception as e:
        logger.error(f"服务器启动失败: {e}")
        raise


if __name__ == "__main__":
    main()