import json
from fastapi import APIRouter, Depends, HTTPException, Query
from starlette.responses import StreamingResponse

from ..schemas.auth import User
from ..schemas.config import (
    CredentialCreate,
    CredentialRecord,
    CredentialUpdate,
    CredentialsList,
    EntriesPayload,
)
from ..schemas.scanner import ScannerStatus
from ..services.config_repo import ConfigRepository
from ..services.match_store import MatchStore
from ..services.scanner_manager import ScannerManager


def get_router(
    repo: ConfigRepository,
    match_store: MatchStore,
    scanner_manager: ScannerManager,
    require_user,
    token_verifier,
) -> APIRouter:
    router = APIRouter()

    def get_repo() -> ConfigRepository:
        return repo

    def get_match_store() -> MatchStore:
        return match_store

    def get_scanner() -> ScannerManager:
        return scanner_manager

    @router.get("/credentials", response_model=CredentialsList)
    def list_credentials(
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        return CredentialsList(items=repository.list_credentials())

    @router.get("/credentials/active", response_model=CredentialRecord)
    def get_active_credentials(
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        data = repository.get_active_credentials()
        if not data:
            raise HTTPException(status_code=404, detail="Credentials not configured.")
        return data

    @router.post("/credentials", response_model=CredentialRecord)
    def create_credentials(
        payload: CredentialCreate,
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        return repository.create_credentials(payload)

    @router.put("/credentials/{credential_id}", response_model=CredentialRecord)
    def update_credentials(
        credential_id: str,
        payload: CredentialUpdate,
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        try:
            return repository.update_credentials(credential_id, payload)
        except ValueError as exc:
            raise HTTPException(status_code=404, detail=str(exc)) from exc

    @router.delete("/credentials/{credential_id}")
    def delete_credentials(
        credential_id: str,
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        try:
            repository.delete_credentials(credential_id)
        except ValueError as exc:
            raise HTTPException(status_code=404, detail=str(exc)) from exc
        return {"deleted": True}

    @router.post("/credentials/{credential_id}/activate", response_model=CredentialRecord)
    def activate_credentials(
        credential_id: str,
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        try:
            return repository.activate_credentials(credential_id)
        except ValueError as exc:
            raise HTTPException(status_code=404, detail=str(exc)) from exc

    @router.get("/keywords", response_model=EntriesPayload)
    def get_keywords(
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        return EntriesPayload(items=repository.read_keywords())

    @router.put("/keywords", response_model=EntriesPayload)
    def put_keywords(
        payload: EntriesPayload,
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        return EntriesPayload(items=repository.write_keywords(payload.items))

    @router.get("/channels", response_model=EntriesPayload)
    def get_channels(
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        return EntriesPayload(items=repository.read_channels())

    @router.put("/channels", response_model=EntriesPayload)
    def put_channels(
        payload: EntriesPayload,
        repository: ConfigRepository = Depends(get_repo),
        current_user: User = Depends(require_user),
    ):
        return EntriesPayload(items=repository.write_channels(payload.items))

    @router.post("/scanner/start", response_model=ScannerStatus)
    async def start_scanner(
        scanner: ScannerManager = Depends(get_scanner),
        current_user: User = Depends(require_user),
    ):
        await scanner.start()
        return await scanner.status()

    @router.post("/scanner/stop", response_model=ScannerStatus)
    async def stop_scanner(
        scanner: ScannerManager = Depends(get_scanner),
        current_user: User = Depends(require_user),
    ):
        await scanner.stop()
        return await scanner.status()

    @router.get("/scanner/status", response_model=ScannerStatus)
    async def get_status(
        scanner: ScannerManager = Depends(get_scanner),
        current_user: User = Depends(require_user),
    ):
        return await scanner.status()

    @router.get("/matches")
    async def get_matches(
        limit: int = Query(50, ge=1, le=200),
        store: MatchStore = Depends(get_match_store),
        current_user: User = Depends(require_user),
    ):
        return await store.get_recent(limit)

    @router.get("/matches/stream")
    async def stream_matches(
        store: MatchStore = Depends(get_match_store),
        token: str | None = Query(default=None),
    ):
        if not token:
            raise HTTPException(status_code=401, detail="Missing token")
        token_verifier(token)
        queue = await store.subscribe()

        async def event_generator():
            try:
                while True:
                    item = await queue.get()
                    data = json.dumps(item.model_dump(), default=str)
                    yield f"data: {data}\n\n"
            finally:
                await store.unsubscribe(queue)

        return StreamingResponse(event_generator(), media_type="text/event-stream")

    return router