import asyncio
import os
import tempfile

from gradio.routes import App
from fastapi import Request
from fastapi.responses import JSONResponse, RedirectResponse

from dream_customs import zerogpu  # noqa: F401
from dream_customs.app_logic import _client_settings
from dream_customs.models import HostedASRClient
from dream_customs.runtime_env import auto_load_runtime_env_json
from dream_customs.ui.app import build_demo


LOCAL_GRADIO_PORT = 7862
HF_SPACE_GRADIO_PORT = 7860
BROWSER_ASR_TIMEOUT_SECONDS = 9.0


def _default_server_port() -> int:
    configured_port = os.getenv("GRADIO_SERVER_PORT", "").strip()
    if configured_port:
        return int(configured_port)
    if os.getenv("SPACE_ID", "").strip() or os.getenv("SPACE_HOST", "").strip():
        return int(os.getenv("PORT", str(HF_SPACE_GRADIO_PORT)))
    return LOCAL_GRADIO_PORT


def _browser_asr_timeout_seconds() -> float:
    value = os.getenv("DREAM_CUSTOMS_BROWSER_ASR_TIMEOUT_SECONDS", "").strip()
    if not value:
        return BROWSER_ASR_TIMEOUT_SECONDS
    try:
        return max(5.0, float(value))
    except ValueError:
        return BROWSER_ASR_TIMEOUT_SECONDS


def _browser_asr_client() -> HostedASRClient:
    resolved = _client_settings(asr_timeout_seconds=_browser_asr_timeout_seconds())
    return HostedASRClient(
        endpoint=resolved["asr_endpoint"],
        token=resolved["hosted_token"],
        timeout=resolved["asr_timeout_seconds"],
        latency_budget_ms=resolved["asr_latency_budget_ms"],
        fallback_enabled=False,
    )


auto_load_runtime_env_json()
demo = build_demo()


_ORIGINAL_CREATE_APP = App.create_app


def _install_gradio_api_aliases(app, blocks) -> None:
    existing_paths = {getattr(route, "path", "") for route in app.routes}

    if "/dream-asr" not in existing_paths:
        @app.post("/dream-asr", include_in_schema=False)
        async def dream_asr(request: Request) -> JSONResponse:
            """Transcribe a browser-recorded voice note through the server-side ASR client."""

            form = await request.form()
            upload = form.get("audio")
            if upload is None or not hasattr(upload, "read"):
                return JSONResponse(
                    {"status": "error", "transcript": "", "error": "Missing audio."},
                    status_code=400,
                )

            filename = str(getattr(upload, "filename", "") or "dream-voice.webm")
            suffix = os.path.splitext(filename)[1] or ".webm"
            temp_path = ""
            asr_client = None
            try:
                audio_bytes = await upload.read()
                if not audio_bytes:
                    return JSONResponse(
                        {"status": "error", "transcript": "", "error": "Empty audio."},
                        status_code=400,
                    )
                with tempfile.NamedTemporaryFile(delete=False, suffix=suffix) as temp_file:
                    temp_file.write(audio_bytes)
                    temp_path = temp_file.name
                asr_client = _browser_asr_client()
                transcript = await asyncio.to_thread(asr_client.transcribe, temp_path)
            finally:
                if temp_path:
                    try:
                        os.unlink(temp_path)
                    except OSError:
                        pass

            if not transcript:
                return JSONResponse(
                    {
                        "status": "error",
                        "transcript": "",
                        "error": (
                            asr_client.last_error
                            if asr_client is not None
                            else "MiMo ASR client could not be initialized."
                        )
                        or "No transcript returned.",
                    },
                    status_code=502,
                )
            return JSONResponse({"status": "ok", "transcript": transcript})

    if "/gradio_api/info" not in existing_paths:
        @app.get("/gradio_api/info", include_in_schema=False)
        async def gradio_api_info_alias() -> JSONResponse:
            """Compatibility for Hugging Face's generated agents.md schema URL."""

            return JSONResponse(blocks.get_api_info())

    async def _redirect_to_gradio4_path(request: Request) -> RedirectResponse:
        suffix = request.url.path.removeprefix("/gradio_api")
        target = suffix or "/"
        if request.url.query:
            target = f"{target}?{request.url.query}"
        return RedirectResponse(url=target, status_code=307)

    for alias_path in (
        "/gradio_api/queue/join",
        "/gradio_api/queue/data",
        "/gradio_api/upload",
    ):
        if alias_path not in existing_paths:
            app.add_api_route(
                alias_path,
                _redirect_to_gradio4_path,
                methods=["GET", "POST"],
                include_in_schema=False,
            )


def _create_app_with_gradio_api_aliases(blocks, app_kwargs=None, auth_dependency=None):
    app = _ORIGINAL_CREATE_APP(blocks, app_kwargs=app_kwargs, auth_dependency=auth_dependency)
    _install_gradio_api_aliases(app, blocks)
    return app


App.create_app = staticmethod(_create_app_with_gradio_api_aliases)
_install_gradio_api_aliases(demo.app, demo)


if __name__ == "__main__":
    demo.launch(
        server_name=os.getenv("GRADIO_SERVER_NAME", "0.0.0.0"),
        server_port=_default_server_port(),
        show_api=False,
        show_error=True,
    )