"""HTTP API.

The browser talks only to this backend; the backend talks to the robot. No robot
address, port or credential ever reaches the page.
"""

from __future__ import annotations

import logging
import platform
import time
from typing import Any, Dict

from fastapi import APIRouter, HTTPException, Request
from fastapi.responses import FileResponse

from ..config.settings import reload_settings
from ..core.events import EventType
from ..robot.manager import RobotManager
from ..services.audio_library import get_audio_library
from ..services.speech_service import SpeechService
from .schemas import SimpleResponse, SpeakRequest, SpeakResponse

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api", tags=["robot"])

STARTED_AT = time.time()


def _manager(request: Request) -> RobotManager:
    return request.app.state.robot_manager


def _speech(request: Request) -> SpeechService:
    return request.app.state.speech_service


# --------------------------------------------------------------------------- #
# health / config
# --------------------------------------------------------------------------- #
@router.get("/health")
async def health(request: Request) -> Dict[str, Any]:
    """Liveness of the *web app* - always 200, even with the robot offline."""
    return {
        "status": "ok",
        "uptimeSeconds": round(time.time() - STARTED_AT, 1),
        "python": platform.python_version(),
        "mode": request.app.state.settings.robot.mode,
    }


@router.get("/config")
async def get_config(request: Request) -> Dict[str, Any]:
    return request.app.state.settings.public_dict()


@router.post("/config/reload")
async def post_config_reload(request: Request) -> Dict[str, Any]:
    """Re-read .env and rebuild the robot adapter without restarting the server.

    This is what you call after pasting the robot's IP into .env.
    """
    settings = reload_settings()
    request.app.state.settings = settings
    _speech(request).update_settings(settings)
    await _manager(request).rebuild(settings)
    request.app.state.event_bus.publish(EventType.CONFIG_UPDATED, settings.public_dict())
    logger.info("configuration reloaded: mode=%s address=%s",
                settings.robot.mode, settings.robot.address)
    return {"success": True, "config": settings.public_dict()}


# --------------------------------------------------------------------------- #
# robot
# --------------------------------------------------------------------------- #
@router.get("/robot/status")
async def robot_status(request: Request) -> Dict[str, Any]:
    status = _manager(request).status_dict()
    status["busy"] = _speech(request).is_busy
    status["activeRequestId"] = _speech(request).active_request_id
    return status


@router.get("/robot/diagnostics")
async def robot_diagnostics(request: Request) -> Dict[str, Any]:
    manager = _manager(request)
    detail = await manager.adapter.describe()
    return {
        "status": manager.status_dict(),
        "adapter": detail,
        "config": request.app.state.settings.public_dict(),
    }


@router.post("/robot/speak", response_model=SpeakResponse)
async def robot_speak(payload: SpeakRequest, request: Request) -> Dict[str, Any]:
    """Send text to the robot.

    Returns once the robot has *acknowledged* the utterance. Speaking progress and
    completion arrive over the WebSocket at /ws.
    """
    return await _speech(request).speak(payload.text, payload.voice, payload.language)


@router.post("/robot/stop", response_model=SimpleResponse)
async def robot_stop(request: Request) -> Dict[str, Any]:
    return await _speech(request).stop()


@router.post("/robot/reconnect")
async def robot_reconnect(request: Request) -> Dict[str, Any]:
    manager = _manager(request)
    manager.request_reconnect()
    return {"success": True, "status": manager.state.value}


# --------------------------------------------------------------------------- #
# history
# --------------------------------------------------------------------------- #
@router.get("/speech/history")
async def speech_history(request: Request) -> Dict[str, Any]:
    service = _speech(request)
    items = service.annotate_saved(service.history.list())
    return {"items": items, "count": len(items)}


@router.delete("/speech/history")
async def speech_history_delete(request: Request) -> Dict[str, Any]:
    return _speech(request).clear_history()


@router.post("/speech/history/clear")
async def speech_history_clear(request: Request) -> Dict[str, Any]:
    """Same as DELETE - kept because it is easier to call from a plain form/curl."""
    return _speech(request).clear_history()


# --------------------------------------------------------------------------- #
# saved audio
# --------------------------------------------------------------------------- #
@router.get("/audio")
async def audio_list() -> Dict[str, Any]:
    """Every line that has been synthesised and saved as a .wav."""
    library = get_audio_library()
    return {"items": library.list(), "stats": library.stats()}


@router.get("/audio/{audio_id}/file")
async def audio_file(audio_id: str):
    """The .wav itself - playable in the browser, or downloadable."""
    entry = get_audio_library().get(audio_id)
    if entry is None:
        raise HTTPException(status_code=404, detail="No saved audio with that id.")
    path = get_audio_library().root / entry["file"]
    return FileResponse(
        str(path), media_type="audio/wav", filename=entry["file"],
        headers={"Cache-Control": "public, max-age=31536000"},
    )


@router.delete("/audio/{audio_id}")
async def audio_delete(audio_id: str) -> Dict[str, Any]:
    if not get_audio_library().delete(audio_id):
        raise HTTPException(status_code=404, detail="No saved audio with that id.")
    return {"success": True}


@router.delete("/audio")
async def audio_clear() -> Dict[str, Any]:
    """Delete every saved clip. They are re-created on demand."""
    return {"success": True, "removed": get_audio_library().clear()}