"""REST API Endpoints"""
import logging
import os
from pathlib import Path
from aiohttp import web
from app.config import Config
from app.services.queue import QueueService
from app.services.scanner import ScannerService
from app.services.encoder import EncoderService


def setup_api_routes(app: web.Application, config: Config,
                     queue_service: QueueService,
                     scanner: ScannerService) -> None:
    """Registriert alle API-Routes"""

    # --- Job-Management ---

    async def post_convert(request: web.Request) -> web.Response:
        """
        POST /api/convert
        Body: {"files": ["/pfad/datei.mkv", "/pfad/ordner/"]}
        Optional: {"files": [...], "preset": "gpu_av1", "recursive": true}
        Hauptendpoint fuer KDE Dolphin Integration.
        """
        try:
            data = await request.json()
        except Exception:
            return web.json_response(
                {"error": "Ungueltiges JSON"}, status=400
            )

        files = data.get("files", [])
        if not files:
            return web.json_response(
                {"error": "Keine Dateien angegeben"}, status=400
            )

        preset = data.get("preset")
        recursive = data.get("recursive")

        logging.info(f"POST /api/convert: {len(files)} Pfade empfangen")

        jobs = await queue_service.add_paths(files, preset, recursive)

        return web.json_response({
            "message": f"{len(jobs)} Jobs erstellt",
            "jobs": [{"id": j.id, "file": j.media.source_filename} for j in jobs],
        })

    async def get_jobs(request: web.Request) -> web.Response:
        """GET /api/jobs - Alle Jobs mit Status"""
        return web.json_response({"jobs": queue_service.get_all_jobs()})

    async def delete_job(request: web.Request) -> web.Response:
        """DELETE /api/jobs/{job_id}"""
        job_id = int(request.match_info["job_id"])
        success = await queue_service.remove_job(job_id)
        if success:
            return web.json_response({"message": "Job geloescht"})
        return web.json_response({"error": "Job nicht gefunden"}, status=404)

    async def post_cancel(request: web.Request) -> web.Response:
        """POST /api/jobs/{job_id}/cancel"""
        job_id = int(request.match_info["job_id"])
        success = await queue_service.cancel_job(job_id)
        if success:
            return web.json_response({"message": "Job abgebrochen"})
        return web.json_response({"error": "Job nicht aktiv"}, status=400)

    async def post_retry(request: web.Request) -> web.Response:
        """POST /api/jobs/{job_id}/retry"""
        job_id = int(request.match_info["job_id"])
        success = await queue_service.retry_job(job_id)
        if success:
            return web.json_response({"message": "Job wiederholt"})
        return web.json_response({"error": "Job nicht fehlgeschlagen"}, status=400)

    # --- Settings ---

    async def get_settings(request: web.Request) -> web.Response:
        """GET /api/settings"""
        return web.json_response(config.settings)

    async def put_settings(request: web.Request) -> web.Response:
        """PUT /api/settings - Settings aktualisieren"""
        try:
            new_settings = await request.json()
        except Exception:
            return web.json_response(
                {"error": "Ungueltiges JSON"}, status=400
            )

        # Settings zusammenfuehren (deep merge)
        _deep_merge(config.settings, new_settings)
        config.save_settings()
        logging.info("Settings aktualisiert via API")
        return web.json_response({"message": "Settings gespeichert"})

    # --- Presets ---

    async def get_presets(request: web.Request) -> web.Response:
        """GET /api/presets"""
        return web.json_response(config.presets)

    async def put_preset(request: web.Request) -> web.Response:
        """PUT /api/presets/{preset_name}"""
        preset_name = request.match_info["preset_name"]
        try:
            preset_data = await request.json()
        except Exception:
            return web.json_response(
                {"error": "Ungueltiges JSON"}, status=400
            )

        config.presets[preset_name] = preset_data
        config.save_presets()
        logging.info(f"Preset '{preset_name}' aktualisiert")
        return web.json_response({"message": f"Preset '{preset_name}' gespeichert"})

    # --- Statistics ---

    async def get_statistics(request: web.Request) -> web.Response:
        """GET /api/statistics?limit=50&offset=0"""
        limit = int(request.query.get("limit", 50))
        offset = int(request.query.get("offset", 0))
        stats = await queue_service.get_statistics(limit, offset)
        summary = await queue_service.get_statistics_summary()
        return web.json_response({"entries": stats, "summary": summary})

    # --- System ---

    async def get_system_info(request: web.Request) -> web.Response:
        """GET /api/system - GPU-Status, verfuegbare Devices"""
        gpu_available = EncoderService.detect_gpu_available()
        devices = EncoderService.get_available_render_devices()
        return web.json_response({
            "encoding_mode": config.encoding_mode,
            "gpu_available": gpu_available,
            "gpu_devices": devices,
            "gpu_device_configured": config.gpu_device,
            "default_preset": config.default_preset_name,
            "max_parallel_jobs": config.max_parallel_jobs,
            "active_jobs": len([
                j for j in queue_service.jobs.values()
                if j.status.value == 1
            ]),
            "queued_jobs": len([
                j for j in queue_service.jobs.values()
                if j.status.value == 0
            ]),
        })

    async def get_ws_config(request: web.Request) -> web.Response:
        """GET /api/ws-config - WebSocket-URL fuer Client"""
        srv = config.server_config
        ext_url = srv.get("external_url", "")
        use_https = srv.get("use_https", False)
        port = srv.get("port", 8080)

        if ext_url:
            ws_url = ext_url
        else:
            ws_url = f"{request.host}"

        return web.json_response({
            "websocket_url": ws_url,
            "websocket_path": srv.get("websocket_path", "/ws"),
            "use_https": use_https,
            "port": port,
        })

    # --- Filebrowser ---

    # Erlaubte Basispfade (Sicherheit: nur unter /mnt navigierbar)
    _BROWSE_ROOTS = ["/mnt"]

    def _is_path_allowed(path: str) -> bool:
        """Prueft ob Pfad unter einem erlaubten Root liegt"""
        real = os.path.realpath(path)
        return any(real.startswith(root) for root in _BROWSE_ROOTS)

    async def get_browse(request: web.Request) -> web.Response:
        """
        GET /api/browse?path=/mnt
        Gibt Ordner und Videodateien im Verzeichnis zurueck.
        """
        path = request.query.get("path", "/mnt")

        if not _is_path_allowed(path):
            return web.json_response(
                {"error": "Zugriff verweigert"}, status=403
            )

        if not os.path.isdir(path):
            return web.json_response(
                {"error": "Verzeichnis nicht gefunden"}, status=404
            )

        scan_ext = set(config.files_config.get("scan_extensions", []))
        dirs = []
        files = []

        try:
            for entry in sorted(os.listdir(path)):
                # Versteckte Dateien ueberspringen
                if entry.startswith("."):
                    continue

                full = os.path.join(path, entry)

                if os.path.isdir(full):
                    # Anzahl Videodateien im Unterordner zaehlen
                    video_count = 0
                    try:
                        for f in os.listdir(full):
                            if os.path.splitext(f)[1].lower() in scan_ext:
                                video_count += 1
                    except PermissionError:
                        pass
                    dirs.append({
                        "name": entry,
                        "path": full,
                        "video_count": video_count,
                    })

                elif os.path.isfile(full):
                    ext = os.path.splitext(entry)[1].lower()
                    if ext in scan_ext:
                        size = os.path.getsize(full)
                        files.append({
                            "name": entry,
                            "path": full,
                            "size": size,
                            "size_human": _format_size(size),
                        })

        except PermissionError:
            return web.json_response(
                {"error": "Keine Leseberechtigung"}, status=403
            )

        # Eltern-Pfad (zum Navigieren nach oben)
        parent = os.path.dirname(path)
        if not _is_path_allowed(parent):
            parent = None

        return web.json_response({
            "path": path,
            "parent": parent,
            "dirs": dirs,
            "files": files,
            "total_files": len(files),
        })

    def _format_size(size_bytes: int) -> str:
        """Kompakte Groessenangabe"""
        if size_bytes < 1024 * 1024:
            return f"{size_bytes / 1024:.0f} KiB"
        if size_bytes < 1024 * 1024 * 1024:
            return f"{size_bytes / (1024 * 1024):.1f} MiB"
        return f"{size_bytes / (1024 * 1024 * 1024):.2f} GiB"

    # --- Upload ---

    # Upload-Verzeichnis
    _UPLOAD_DIR = "/mnt/uploads"

    async def post_upload(request: web.Request) -> web.Response:
        """
        POST /api/upload (multipart/form-data)
        Laedt eine Videodatei hoch und startet die Konvertierung.
        """
        os.makedirs(_UPLOAD_DIR, exist_ok=True)

        reader = await request.multipart()
        preset = None
        saved_files = []

        while True:
            part = await reader.next()
            if part is None:
                break

            if part.name == "preset":
                preset = (await part.text()).strip() or None
                continue

            if part.name == "files":
                filename = part.filename
                if not filename:
                    continue

                # Sicherheit: Nur Dateiname ohne Pfad
                filename = os.path.basename(filename)
                ext = os.path.splitext(filename)[1].lower()
                scan_ext = set(config.files_config.get("scan_extensions", []))
                if ext not in scan_ext:
                    logging.warning(f"Upload abgelehnt (Extension {ext}): {filename}")
                    continue

                # Datei speichern
                dest = os.path.join(_UPLOAD_DIR, filename)
                # Konfliktvermeidung
                if os.path.exists(dest):
                    base, extension = os.path.splitext(filename)
                    counter = 1
                    while os.path.exists(dest):
                        dest = os.path.join(
                            _UPLOAD_DIR, f"{base}_{counter}{extension}"
                        )
                        counter += 1

                size = 0
                with open(dest, "wb") as f:
                    while True:
                        chunk = await part.read_chunk()
                        if not chunk:
                            break
                        f.write(chunk)
                        size += len(chunk)

                saved_files.append(dest)
                logging.info(f"Upload: {filename} ({_format_size(size)})")

        if not saved_files:
            return web.json_response(
                {"error": "Keine gueltigen Videodateien hochgeladen"}, status=400
            )

        jobs = await queue_service.add_paths(saved_files, preset)

        return web.json_response({
            "message": f"{len(saved_files)} Datei(en) hochgeladen, {len(jobs)} Jobs erstellt",
            "jobs": [{"id": j.id, "file": j.media.source_filename} for j in jobs],
        })

    # --- Logs ---

    # In-Memory Log-Buffer
    _log_buffer = []
    _log_id = 0
    _MAX_LOGS = 200

    class WebLogHandler(logging.Handler):
        """Handler der Logs an den Buffer sendet"""
        def emit(self, record):
            nonlocal _log_id
            _log_id += 1
            entry = {
                "id": _log_id,
                "level": record.levelname,
                "message": record.getMessage(),
                "time": record.created,
            }
            _log_buffer.append(entry)
            # Buffer begrenzen
            while len(_log_buffer) > _MAX_LOGS:
                _log_buffer.pop(0)

    # Handler registrieren
    web_handler = WebLogHandler()
    web_handler.setLevel(logging.INFO)
    logging.getLogger().addHandler(web_handler)

    async def get_logs(request: web.Request) -> web.Response:
        """GET /api/logs?since=123 - Logs seit ID"""
        since = int(request.query.get("since", 0))
        logs = [l for l in _log_buffer if l["id"] > since]
        return web.json_response({"logs": logs})

    # --- Routes registrieren ---
    app.router.add_get("/api/logs", get_logs)
    app.router.add_get("/api/browse", get_browse)
    app.router.add_post("/api/upload", post_upload)
    app.router.add_post("/api/convert", post_convert)
    app.router.add_get("/api/jobs", get_jobs)
    app.router.add_delete("/api/jobs/{job_id}", delete_job)
    app.router.add_post("/api/jobs/{job_id}/cancel", post_cancel)
    app.router.add_post("/api/jobs/{job_id}/retry", post_retry)
    app.router.add_get("/api/settings", get_settings)
    app.router.add_put("/api/settings", put_settings)
    app.router.add_get("/api/presets", get_presets)
    app.router.add_put("/api/presets/{preset_name}", put_preset)
    app.router.add_get("/api/statistics", get_statistics)
    app.router.add_get("/api/system", get_system_info)
    app.router.add_get("/api/ws-config", get_ws_config)


def _deep_merge(base: dict, override: dict) -> None:
    """Rekursives Zusammenfuehren zweier Dicts"""
    for key, value in override.items():
        if key in base and isinstance(base[key], dict) and isinstance(value, dict):
            _deep_merge(base[key], value)
        else:
            base[key] = value