from typing import Optional, List, Dict, Any
from fastapi import APIRouter, Depends, Response

from app.auth import require_user
from app.database import get_db
from app.export import export_csv, export_json, export_anki_tsv, export_markdown

router = APIRouter(tags=["Export"])


def _fetch_all_cards(user_id: int, collection: Optional[str] = None) -> List[Dict[str, Any]]:
    with get_db() as conn:
        if collection:
            rows = conn.execute(
                """
                SELECT id, term, translation, context_sentence, phonetic, audio_url,
                       part_of_speech, definition_en, tags, notes, collection, created_at, updated_at
                FROM vocabulary_cards
                WHERE user_id = ? AND collection = ?
                ORDER BY collection ASC, created_at DESC
                """,
                (user_id, collection),
            ).fetchall()
        else:
            rows = conn.execute(
                """
                SELECT id, term, translation, context_sentence, phonetic, audio_url,
                       part_of_speech, definition_en, tags, notes, collection, created_at, updated_at
                FROM vocabulary_cards
                WHERE user_id = ?
                ORDER BY collection ASC, created_at DESC
                """,
                (user_id,),
            ).fetchall()
        return [dict(r) for r in rows]


@router.get("/api/export/csv")
async def api_export_csv(collection: Optional[str] = None, user: dict = Depends(require_user)):
    cards = _fetch_all_cards(user["id"], collection)
    data = export_csv(cards)
    return Response(
        content=data,
        media_type="text/csv; charset=utf-8",
        headers={"Content-Disposition": 'attachment; filename="vocabulary.csv"'},
    )


@router.get("/api/export/json")
async def api_export_json(collection: Optional[str] = None, user: dict = Depends(require_user)):
    cards = _fetch_all_cards(user["id"], collection)
    data = export_json(cards)
    return Response(
        content=data,
        media_type="application/json; charset=utf-8",
        headers={"Content-Disposition": 'attachment; filename="vocabulary.json"'},
    )


@router.get("/api/export/anki")
async def api_export_anki(collection: Optional[str] = None, user: dict = Depends(require_user)):
    cards = _fetch_all_cards(user["id"], collection)
    data = export_anki_tsv(cards)
    return Response(
        content=data,
        media_type="text/plain; charset=utf-8",
        headers={"Content-Disposition": 'attachment; filename="vocabulary_anki.txt"'},
    )


@router.get("/api/export/markdown")
async def api_export_markdown(collection: Optional[str] = None, user: dict = Depends(require_user)):
    cards = _fetch_all_cards(user["id"], collection)
    data = export_markdown(cards)
    return Response(
        content=data,
        media_type="text/markdown; charset=utf-8",
        headers={"Content-Disposition": 'attachment; filename="vocabulary.md"'},
    )