"""
AWOOOI API - BFF Gateway
========================
ADR-005: BFF Architecture
ADR-006: AI Fallback Strategy

Four Iron Laws:
1. Async-First      - All handlers are async def
2. CORS Whitelist   - Strict origin control (NO wildcards)
3. Pydantic Config  - Type-safe settings with validation
4. structlog        - Structured JSON logging

Observability Stack:
- OpenTelemetry → SignOz (Traces + Logs + Metrics)
- Sentry SDK → Sentry Self-Hosted (Error Tracking + Stack Traces)

Version: 1.0.0
Date: 2026-03-20
"""

import os
from collections.abc import AsyncGenerator
from contextlib import asynccontextmanager

import sentry_sdk
import structlog
from fastapi import FastAPI, Request
from sentry_sdk.integrations.fastapi import FastApiIntegration
from sentry_sdk.integrations.starlette import StarletteIntegration
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

from src.api.v1 import agents as agents_v1  # Phase 9.5: Agent Teams API
from src.api.v1 import ai as ai_v1
from src.api.v1 import approvals as approvals_v1
from src.api.v1 import audit_logs as audit_logs_v1
from src.api.v1 import dashboard as dashboard_v1

# Import API routers
from src.api.v1 import health as health_v1
from src.api.v1 import incidents as incidents_v1  # Phase 6.4: Decision Proposal
from src.api.v1 import metrics as metrics_v1  # Phase 7: Gold Metrics (真實血脈)
from src.api.v1 import proposals as proposals_v1  # Phase 6.4h: Proposals CRUD API
from src.api.v1 import stats as stats_v1  # Phase 6.5: Statistics Analytics
from src.api.v1 import telegram as telegram_v1  # Phase 5.4: Telegram Gateway
from src.api.v1 import timeline as timeline_v1
from src.api.v1 import webhooks as webhooks_v1
from src.core.config import settings
from src.core.http_client import close_all_http_clients, init_all_http_clients
from src.core.logging import get_logger, setup_logging
from src.core.redis_client import close_redis_pool, init_redis_pool
from src.core.sse import get_publisher
from src.core.telemetry import setup_telemetry, shutdown_telemetry

# CTO-201: Database & Executor
from src.db.base import close_db, init_db

# Phase 6.4g: lewooogo-brain 積木路由
from src.routers import proposals as proposals_router

# Legacy route imports (to be migrated)
from src.routes import agent, notifications, pipelines, plugins
from src.services.executor import close_executor

# Phase 5: OpenClaw AI Engine
from src.services.openclaw import close_openclaw
from src.services.telegram_gateway import get_telegram_gateway

# Phase 6.1: Event Bus (Signal Worker)
from src.workers import close_signal_worker, init_signal_worker

# =============================================================================
# Initialize Logging (MUST be first)
# =============================================================================
setup_logging()
logger = get_logger("awoooi.api")

# =============================================================================
# Sentry SDK Initialization (Error Tracking - 補強 SignOz)
# Self-Hosted @ 192.168.0.110
# 分工: Sentry 專注 Error Tracking，SignOz 專注 Traces/Logs/Metrics
# =============================================================================
SENTRY_DSN = os.getenv("SENTRY_DSN")
if SENTRY_DSN:
    sentry_sdk.init(
        dsn=SENTRY_DSN,
        environment=settings.ENVIRONMENT,
        release=f"awoooi-api@{settings.VERSION}",
        # 效能監控取樣率 (生產環境降低)
        traces_sample_rate=0.1 if settings.ENVIRONMENT == "production" else 1.0,
        # FastAPI 深度整合
        integrations=[
            FastApiIntegration(transaction_style="endpoint"),
            StarletteIntegration(transaction_style="endpoint"),
        ],
        # 忽略常見的非錯誤
        ignore_errors=[
            ConnectionRefusedError,
            TimeoutError,
        ],
        # 只在生產環境發送
        send_default_pii=False,
    )
    logger.info("sentry_initialized", dsn=SENTRY_DSN.split("@")[-1])
else:
    logger.info("sentry_disabled", reason="SENTRY_DSN not configured")


# =============================================================================
# Application Lifespan
# =============================================================================
@asynccontextmanager
async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
    """Application lifespan events"""
    # Startup
    logger.info(
        "api_startup",
        version=settings.VERSION,
        environment=settings.ENVIRONMENT,
        mock_mode=settings.MOCK_MODE,
        cors_origins=settings.CORS_ORIGINS,
        ai_fallback_order=settings.AI_FALLBACK_ORDER,
        four_hosts=settings.four_hosts,
        kubeconfig=settings.KUBECONFIG_PATH,
    )

    # CTO-201: Initialize PostgreSQL database (統帥鐵律: 禁止 SQLite)
    await init_db()
    db_url = settings.DATABASE_URL
    logger.info(
        "database_initialized", url=db_url.split("@")[-1] if "@" in db_url else db_url
    )

    # Phase 5: Initialize HTTP Clients (ClickHouse, Ollama)
    # 統帥鐵律: 連線池在啟動時建立，關閉時回收
    await init_all_http_clients()
    logger.info("http_clients_initialized")

    # Phase 6.1.1: Initialize Redis Pool (Multi-Sig 狀態持久化)
    # 統帥鐵律: Redis 連線池在 Lifespan 啟動時建立
    await init_redis_pool()
    logger.info("redis_pool_initialized", url=settings.REDIS_URL.split("@")[-1])

    # Start SSE publisher
    publisher = await get_publisher()
    logger.info("sse_publisher_initialized")

    # Phase 5: Telegram Gateway 初始化
    # 2026-03-23 架構修正: AWOOOI API 不做 Long Polling
    # 原因: 同一個 Bot Token 只能有一個 Long Polling 實例
    # OpenClaw (192.168.0.188) 是唯一的 Polling 實例
    # AWOOOI API 只負責發送訊息，不接收
    telegram_gw = get_telegram_gateway()
    if settings.TELEGRAM_ENABLE_POLLING:
        await telegram_gw.start_long_polling()
        logger.info("telegram_long_polling_started")
    else:
        logger.info("telegram_polling_disabled", reason="OpenClaw 是唯一 Polling 實例")

    # Phase 6.5: Telegram 心跳監控 (防止沉默盲點)
    # - 每 30 分鐘發送心跳，證明告警鏈路正常
    # - 超過 2 小時沒訊息則告警
    if settings.OPENCLAW_TG_BOT_TOKEN:
        await telegram_gw.start_heartbeat_monitor(
            heartbeat_interval_minutes=30,
            silence_threshold_hours=2,
        )
        logger.info("telegram_heartbeat_monitor_started")

    # Phase 6.1: 啟動 Signal Worker (Redis Streams Consumer)
    # 統帥鐵律: Event Bus 解耦告警接收與處理
    await init_signal_worker()
    logger.info("signal_worker_initialized")

    yield

    # Shutdown
    # Phase 6.1: 關閉 Signal Worker (先關閉 Consumer)
    await close_signal_worker()
    await publisher.stop()
    await close_executor()
    await close_openclaw()
    # Phase 5.4: Close Telegram Gateway
    telegram_gw = get_telegram_gateway()
    await telegram_gw.close()
    # Phase 5: Close HTTP Clients (統帥鐵律: 連線池回收)
    await close_all_http_clients()
    # Phase 6.1.1: Close Redis Pool (統帥鐵律: Redis 連線池回收)
    await close_redis_pool()
    await close_db()
    shutdown_telemetry()
    logger.info("api_shutdown", version=settings.VERSION)


# =============================================================================
# FastAPI Application
# =============================================================================
app = FastAPI(
    title="AWOOOI API",
    description="AWOOOI 智能運維平台 API - 由 leWOOOgo Engine 驅動",
    version=settings.VERSION,
    docs_url="/api/v1/docs",
    redoc_url="/api/v1/redoc",
    openapi_url="/api/v1/openapi.json",
    lifespan=lifespan,
)


# =============================================================================
# OpenTelemetry Instrumentation (可觀測性鐵律)
# 必須在 Middleware 之前初始化，確保追蹤完整性
# 優雅降級: 失敗不影響 API 啟動
# =============================================================================
otel_enabled = setup_telemetry(app)
if otel_enabled:
    logger.info(
        "otel_initialized",
        service=settings.OTEL_SERVICE_NAME,
        endpoint=settings.OTEL_EXPORTER_OTLP_ENDPOINT,
    )
else:
    logger.warning("otel_disabled", reason="initialization failed or disabled")


# =============================================================================
# Middleware
# =============================================================================

# CORS - Strict Whitelist (Iron Law #2)
# NO wildcards, NO UAT
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.CORS_ORIGINS,
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "DELETE", "PATCH"],
    allow_headers=["Authorization", "Content-Type", "X-Request-ID"],
    expose_headers=["X-Request-ID"],
)


@app.middleware("http")
async def request_logging_middleware(request: Request, call_next):
    """
    Structured request logging middleware

    Logs every request with:
    - Request ID (from header or generated)
    - HTTP method and path
    - Response status code
    - Request duration
    """
    import time

    request_id = request.headers.get("X-Request-ID", "-")
    start_time = time.perf_counter()

    # Bind request context for all logs in this request
    structlog.contextvars.clear_contextvars()
    structlog.contextvars.bind_contextvars(
        request_id=request_id,
        method=request.method,
        path=request.url.path,
    )

    log = get_logger("awoooi.http")
    log.debug("request_start")

    response = await call_next(request)

    duration_ms = (time.perf_counter() - start_time) * 1000
    log.info(
        "request_complete",
        status_code=response.status_code,
        duration_ms=round(duration_ms, 2),
    )

    # Add request ID to response headers
    response.headers["X-Request-ID"] = request_id
    return response


# =============================================================================
# Exception Handlers
# =============================================================================


@app.exception_handler(Exception)
async def global_exception_handler(_request: Request, exc: Exception) -> JSONResponse:
    """
    Global exception handler with structured logging + Sentry

    Catches all unhandled exceptions and returns a safe error response.
    Full exception details are logged but not exposed to clients.
    Sentry SDK 會自動捕獲並發送到 Self-Hosted Server。
    """
    # Sentry 自動捕獲 (如果已初始化)
    sentry_sdk.capture_exception(exc)

    log = get_logger("awoooi.error")
    log.exception(
        "unhandled_exception",
        exc_type=type(exc).__name__,
        exc_message=str(exc),
    )
    return JSONResponse(
        status_code=500,
        content={
            "code": "INTERNAL_ERROR",
            "message": "An internal error occurred",
        },
    )


# =============================================================================
# API Routers - Path-based routing (/api/v1/*)
# =============================================================================

# New v1 API routes
app.include_router(health_v1.router, prefix="/api/v1", tags=["Health"])
app.include_router(dashboard_v1.router, prefix="/api/v1", tags=["Dashboard"])
app.include_router(approvals_v1.router, prefix="/api/v1", tags=["HITL Approvals"])
app.include_router(ai_v1.router, prefix="/api/v1", tags=["AI Decision"])
app.include_router(webhooks_v1.router, prefix="/api/v1", tags=["Webhooks"])
app.include_router(timeline_v1.router, prefix="/api/v1", tags=["Timeline"])
app.include_router(audit_logs_v1.router, prefix="/api/v1", tags=["Audit Logs"])
app.include_router(
    telegram_v1.router, prefix="/api/v1", tags=["Telegram Gateway"]
)  # Phase 5.4
app.include_router(
    metrics_v1.router, prefix="/api/v1", tags=["Gold Metrics"]
)  # Phase 7: 真實血脈
app.include_router(
    incidents_v1.router, prefix="/api/v1", tags=["Incidents"]
)  # Phase 6.4: Decision Proposal
app.include_router(
    proposals_v1.router, prefix="/api/v1", tags=["Proposals"]
)  # Phase 6.4h: Proposals CRUD
app.include_router(
    agents_v1.router, prefix="/api/v1", tags=["Agent Teams"]
)  # Phase 9.5: Agent Teams
app.include_router(
    stats_v1.router, prefix="/api/v1", tags=["Statistics"]
)  # Phase 6.5: Statistics Analytics
app.include_router(
    proposals_router.router, tags=["Proposals (Legacy)"]
)  # Phase 6.4g: lewooogo-brain (舊版)

# Legacy routes (to be migrated to api/v1/)
app.include_router(plugins.router, prefix="/api/v1/plugins", tags=["Plugins"])
app.include_router(pipelines.router, prefix="/api/v1/pipelines", tags=["Pipelines"])
app.include_router(agent.router, prefix="/api/v1/agent", tags=["Agent"])
app.include_router(
    notifications.router, prefix="/api/v1/notifications", tags=["Notifications"]
)


# =============================================================================
# Root Endpoint
# =============================================================================


@app.get("/", include_in_schema=False)
async def root() -> dict:
    """Root endpoint with API info"""
    return {
        "name": "AWOOOI API",
        "version": settings.VERSION,
        "environment": settings.ENVIRONMENT,
        "docs": "/api/v1/docs",
        "health": "/api/v1/health",
        "dashboard": "/api/v1/dashboard",
        "stream": "/api/v1/dashboard/stream",
    }


# =============================================================================
# Entry Point
# =============================================================================

if __name__ == "__main__":
    import uvicorn

    uvicorn.run(
        "src.main:app",
        host="0.0.0.0",
        port=8000,
        reload=settings.DEBUG,
        log_level=settings.LOG_LEVEL.lower(),
    )