"""FastAPI 应用工厂与全局服务初始化."""
import logging
import os
import threading
import time
from contextlib import asynccontextmanager

import cv2
from fastapi import FastAPI

from config import CAMERA_GROUPS, SYSTEM_CONFIG, STORAGE_CONFIG
from third_party_pusher import get_third_party_pusher

from core.stream_manager import StreamManager
from core.capture_uploader import CaptureUploader
from core.detector_service import DetectorService
from core.group_state import group_state
from core.oss_uploader import OSSUploader
from core.file_cleanup import make_cleanup_workers

logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    force=True,
)
logger = logging.getLogger(__name__)


def build_rtsp_url(camera_config: dict) -> str:
    if camera_config.get("rtsp_url"):
        return camera_config["rtsp_url"]
    ip = camera_config["ip"]
    port = camera_config.get("rtsp_port", 554)
    username = camera_config["username"]
    password = camera_config["password"]
    channel = camera_config.get("rtsp_channel") or camera_config.get("channel", 1)
    subtype = camera_config.get("subtype", 0)
    return f"rtsp://{username}:{password}@{ip}:{port}/cam/realmonitor?channel={channel}&subtype={subtype}"


def create_app(test_mode: bool = False) -> FastAPI:
    @asynccontextmanager
    async def lifespan(app: FastAPI):
        group_state.reset()

        stream_manager = StreamManager()
        threads: list = []
        stop_event = threading.Event()

        pusher = None
        detector_service = None
        oss_uploader = None
        cleanup_workers: list = []
        app.state.stream_manager = stream_manager
        app.state.pusher = None
        app.state.oss_uploader = None
        app.state.detector_service = None

        if not test_mode:
            if SYSTEM_CONFIG.get("enable_detection", True):
                detector_service = DetectorService()
                app.state.detector_service = detector_service

            # 始终启用第三方推送（只要在配置中 enabled=True）
            try:
                oss_uploader = OSSUploader()
            except Exception as exc:
                print(f"[lifespan] OSS uploader init failed: {exc}")
                oss_uploader = None

            try:
                pusher = get_third_party_pusher()
                if pusher and not pusher.running:
                    pusher.start()
                app.state.pusher = pusher
            except Exception as exc:
                print(f"[lifespan] Pusher start failed: {exc}")
                pusher = None
                app.state.pusher = None

            if pusher is not None:
                def _delete_captures_on_success(report):
                    if STORAGE_CONFIG.get("captures", {}).get("keep_local_copy", False):
                        return
                    for path in report.batch_info.get("image_paths") or []:
                        try:
                            if path and os.path.exists(path):
                                os.remove(path)
                                logger.info("[cleanup] 上报成功后删除本地图片: %s", path)
                        except Exception as exc:
                            logger.warning("[cleanup] 删除本地图片失败: %s, %s", path, exc)

                try:
                    pusher.set_callbacks(on_success=_delete_captures_on_success)
                except Exception as exc:
                    print(f"[lifespan] set pusher success callback failed: {exc}")

            try:
                group_ids = [
                    g.get("group_id", g.get("id"))
                    for g in CAMERA_GROUPS
                    if g.get("enabled", True)
                ]
                cleanup_workers = make_cleanup_workers(STORAGE_CONFIG, group_ids)
                for w in cleanup_workers:
                    w.start()
            except Exception as exc:
                print(f"[lifespan] cleanup worker start failed: {exc}")

        for group in CAMERA_GROUPS:
            if not group.get("enabled", True):
                continue
            gid = group.get("group_id", group.get("id"))

            try:
                pano_cfg = group["panorama"]
                pano_url = build_rtsp_url(pano_cfg)
                ptz_cfg = group.get("ptz")
                ptz_url = build_rtsp_url(ptz_cfg) if ptz_cfg else None

                group_state.init_group(gid, pano_url, ptz_url, None)

                if test_mode:
                    continue

                if SYSTEM_CONFIG.get("enable_panorama_camera", True):
                    stream_manager.register(f"{gid}_panorama", pano_url)
                    if ptz_url:
                        stream_manager.register(f"{gid}_ptz", ptz_url)

                uploader = CaptureUploader(
                    gid,
                    upload_callback=pusher.report_batch if pusher else None,
                    oss_uploader=oss_uploader,
                )

                if SYSTEM_CONFIG.get("enable_detection", True) and detector_service is not None:
                    def panorama_detect_loop(g=gid, uploader=uploader, detector=detector_service):
                        interval = 0.5
                        frame_count = 0
                        while not stop_event.is_set():
                            try:
                                stream = stream_manager.get(f"{g}_panorama")
                                frame = stream.get_frame() if stream else None
                                if frame is not None:
                                    frame_count += 1
                                    if frame_count % 10 == 0:
                                        print(f"[detect] {g} frame count: {frame_count}")
                                    dets = detector.detect(frame)
                                    marked = frame.copy()
                                    if dets:
                                        print(f"[detect] {g} found {len(dets)} objects")
                                        det_dicts = [{
                                            "bbox": [d.bbox[0], d.bbox[1], d.bbox[0]+d.bbox[2], d.bbox[1]+d.bbox[3]],
                                            "confidence": d.confidence,
                                        } for d in dets]
                                        for dd in det_dicts:
                                            print(f"[detect] {g} bbox={dd['bbox']} conf={dd['confidence']:.3f}")
                                        uploader.handle_detection("panorama", frame, det_dicts)
                                        for d in det_dicts:
                                            x1, y1, x2, y2 = d["bbox"]
                                            cv2.rectangle(marked, (x1, y1), (x2, y2), (0, 255, 0), 2)
                                    stream.set_marked_frame(marked)
                                elif stream is None:
                                    err = stream.last_error if stream else "stream not found"
                                    if frame_count == 0:
                                        print(f"[detect] {g} no stream, last_error: {err}")
                            except Exception as exc:
                                print(f"[panorama_detect_loop {g}] error: {exc}")
                            time.sleep(interval)

                    t_panorama = threading.Thread(target=panorama_detect_loop, daemon=True)
                    t_panorama.start()
                    threads.append(t_panorama)

                    if ptz_url:
                        def ptz_detect_loop(g=gid, uploader=uploader, detector=detector_service):
                            interval = 0.5
                            while not stop_event.is_set():
                                try:
                                    stream = stream_manager.get(f"{g}_ptz")
                                    frame = stream.get_frame() if stream else None
                                    if frame is not None:
                                        dets = detector.detect(frame)
                                        if dets:
                                            det_dicts = [{
                                                "bbox": [d.bbox[0], d.bbox[1], d.bbox[0]+d.bbox[2], d.bbox[1]+d.bbox[3]],
                                                "confidence": d.confidence,
                                            } for d in dets]
                                            for dd in det_dicts:
                                                print(f"[detect] {g} PTZ bbox={dd['bbox']} conf={dd['confidence']:.3f}")
                                            uploader.handle_detection("ptz", frame, det_dicts)
                                except Exception as exc:
                                    print(f"[ptz_detect_loop {g}] error: {exc}")
                                time.sleep(interval)

                        t_ptz = threading.Thread(target=ptz_detect_loop, daemon=True)
                        t_ptz.start()
                        threads.append(t_ptz)

            except Exception as exc:
                print(f"[lifespan] Group {gid} setup failed: {exc}")
                continue

        yield

        stop_event.set()
        for t in threads:
            try:
                t.join(timeout=2.0)
            except Exception as exc:
                print(f"[lifespan] Thread join error: {exc}")

        stream_manager.stop_all()

        if pusher and getattr(pusher, "running", False):
            try:
                pusher.stop()
            except Exception as exc:
                print(f"[lifespan] Pusher stop error: {exc}")

        for w in cleanup_workers:
            try:
                w.stop()
            except Exception as exc:
                print(f"[lifespan] cleanup worker stop error: {exc}")

    app = FastAPI(lifespan=lifespan)

    @app.get("/")
    async def root():
        return {"status": "running", "service": "panorama detection"}

    @app.get("/debug")
    async def debug():
        sm = app.state.stream_manager
        ps = app.state.pusher
        ou = app.state.oss_uploader
        ds = app.state.detector_service
        info = {}
        for g in CAMERA_GROUPS:
            if not g.get("enabled", True):
                continue
            gid = g.get("group_id", g.get("id"))
            stream = sm.get(f"{gid}_panorama") if sm else None
            if stream:
                info[gid] = {
                    "stream_alive": stream.thread is not None and stream.thread.is_alive(),
                    "has_frame": stream.latest_frame is not None,
                    "frame_shape": str(stream.latest_frame.shape) if stream.latest_frame is not None else None,
                    "last_error": stream.last_error,
                }
            else:
                info[gid] = {"error": "stream not registered"}
        info["pusher_running"] = ps.running if ps else False
        info["detector"] = ds is not None
        return info

    return app