import os
import aiosqlite as sqlite3
from fastapi import FastAPI
from fastapi.responses import JSONResponse
from typing import Optional, LiteralString, Union
from .constructors import ValidShowEpisodeLineRequest, ValidShowEpisodeListRequest


class Transcriptions(FastAPI):
    """
    Transcription Endpoints
    """

    def __init__(self, app: FastAPI, util, constants) -> None:
        self.app: FastAPI = app
        self.util = util
        self.constants = constants

        self.endpoints: dict = {
            "transcriptions/get_episodes": self.get_episodes_handler,
            "transcriptions/get_episode_lines": self.get_episode_lines_handler,
            # tbd
        }

        for endpoint, handler in self.endpoints.items():
            app.add_api_route(
                f"/{endpoint}", handler, methods=["POST"], include_in_schema=True
            )

    async def get_episodes_handler(
        self, data: ValidShowEpisodeListRequest
    ) -> JSONResponse:
        """
        Get list of episodes by show id
        - **s**: Show ID to query
        """
        show_id: int = data.s
        db_path: Optional[Union[str, LiteralString]] = None
        db_query: Optional[str] = None
        show_title: Optional[str] = None

        if not isinstance(show_id, int):
            return JSONResponse(
                status_code=500,
                content={
                    "err": True,
                    "errorText": "Invalid request",
                },
            )

        show_id = int(show_id)

        if not (str(show_id).isnumeric()) or show_id not in [0, 1, 2]:
            return JSONResponse(
                status_code=500,
                content={
                    "err": True,
                    "errorText": "Show not found.",
                },
            )

        match show_id:
            case 0:
                db_path = os.path.join("/usr/local/share", "sqlite_dbs", "sp.db")
                db_query = """SELECT DISTINCT(("S" || Season || "E" || Episode || " " || Title)), ID FROM SP_DAT ORDER BY Season, Episode"""
                show_title = "South Park"
            case 1:
                db_path = os.path.join("/usr/local/share", "sqlite_dbs", "futur.db")
                db_query = """SELECT DISTINCT(("S" || EP_S || "E" || EP_EP || " " || EP_TITLE)), EP_ID FROM clean_dialog ORDER BY EP_S, EP_EP"""
                show_title = "Futurama"
            case 2:
                db_path = os.path.join("/usr/local/share", "sqlite_dbs", "parks.db")
                db_query = """SELECT DISTINCT(("S" || EP_S || "E" || EP_EP || " " || EP_TITLE)), EP_ID FROM clean_dialog ORDER BY EP_S, EP_EP"""
                show_title = "Parks And Rec"
            case _:
                return JSONResponse(
                    status_code=500,
                    content={
                        "err": True,
                        "errorText": "Unknown error.",
                    },
                )

        async with sqlite3.connect(database=db_path, timeout=1) as _db:
            async with await _db.execute(db_query) as _cursor:
                result: list[tuple] = await _cursor.fetchall()
                return JSONResponse(
                    content={
                        "show_title": show_title,
                        "episodes": [
                            {
                                "id": item[1],
                                "ep_friendly": item[0],
                            }
                            for item in result
                        ],
                    }
                )

    async def get_episode_lines_handler(
        self, data: ValidShowEpisodeLineRequest
    ) -> JSONResponse:
        """
        Get lines for a particular episode
        - **s**: Show ID to query
        - **e**: Episode ID to query
        """
        show_id: int = int(data.s)
        episode_id: int = int(data.e)

        match show_id:
            case 0:
                db_path: Union[str, LiteralString] = os.path.join(
                    "/usr/local/share", "sqlite_dbs", "sp.db"
                )
                db_query: str = (
                    """SELECT ("S" || Season || "E" || Episode || " " || Title), Character, Line FROM SP_DAT WHERE ID = ?"""
                )
            case 1:
                db_path = os.path.join("/usr/local/share", "sqlite_dbs", "futur.db")
                db_query = """SELECT ("S" || EP_S || "E" || EP_EP || " " || EP_TITLE || "<br><em>Opener: " || EP_OPENER || "</em>"), EP_LINE_SPEAKER, EP_LINE FROM clean_dialog WHERE EP_ID = ? ORDER BY LINE_ID ASC"""
            case 2:
                db_path = os.path.join("/usr/local/share", "sqlite_dbs", "parks.db")
                db_query = """SELECT ("S" || EP_S || "E" || EP_EP || " " || EP_TITLE), EP_LINE_SPEAKER, EP_LINE FROM clean_dialog WHERE EP_ID = ? ORDER BY id ASC"""

            case _:
                return JSONResponse(
                    status_code=500,
                    content={
                        "err": True,
                        "errorText": "Unknown error",
                    },
                )

        async with sqlite3.connect(database=db_path, timeout=1) as _db:
            params: tuple = (episode_id,)
            async with await _db.execute(db_query, params) as _cursor:
                result: list[tuple] = await _cursor.fetchall()
                first_result: tuple = result[0]
                return JSONResponse(
                    content={
                        "episode_id": episode_id,
                        "ep_friendly": first_result[0].strip(),
                        "lines": [
                            {
                                "speaker": item[1].strip(),
                                "line": item[2].strip(),
                            }
                            for item in result
                        ],
                    }
                )