import json
from pathlib import Path
from secrets import token_hex

from fastapi import APIRouter, Depends, HTTPException, status
from peewee import Database

from ..config import BaseConfig
from ..db import DB, Certificate, DistinguishedName, User, UserCapability

router = APIRouter(prefix="/install")


CONFIG_FILE = "tmp/config.json"


async def has_config() -> bool:
    return Path(CONFIG_FILE).is_file()


async def load_config() -> BaseConfig:
    try:
        with open(CONFIG_FILE, "r") as kv:
            return BaseConfig.parse_obj(json.load(kv))

    except FileNotFoundError:
        return BaseConfig()


async def connect_db(config: BaseConfig = Depends(load_config)) -> Database:
    db = await config.db.database
    db.connect()
    return db


async def has_tables(db: Database = Depends(connect_db)) -> bool:
    return db.table_exists(User)


@router.get(
    "/config",
    response_model=BaseConfig,
    responses={
        status.HTTP_403_FORBIDDEN: {
            "description": "Must be admin",
            "content": None,
        },
    },
)
async def get_config(
    config: BaseConfig = Depends(load_config),
    has_config: bool = Depends(has_config),
):
    if has_config:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN)

    return config


@router.put(
    "/config",
    responses={
        status.HTTP_200_OK: {
            "content": None,
        },
        status.HTTP_403_FORBIDDEN: {
            "description": "Must be admin",
            "content": None,
        },
    },
)
async def set_config(
    config: BaseConfig,
    has_config: bool = Depends(has_config),
):
    if has_config:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN)

    if config.jwt.secret is None:
        config.jwt.secret = token_hex(32)

    DB.initialize(await connect_db(config))

    with open(CONFIG_FILE, "w") as kv:
        kv.write(config.json(indent=2))


@router.get("/db", responses={
    status.HTTP_200_OK: {
        "model": bool,
    },
})
async def check_db(
    has_tables: bool = Depends(has_tables),
):
    return has_tables


@router.put(
    "/db",
    responses={
        status.HTTP_200_OK: {
            "content": None,
        },
        status.HTTP_400_BAD_REQUEST: {
            "description": "Database exists",
            "content": None,
        },
    },
)
async def create_db(
    admin_name: str,
    admin_password: str,
    config: BaseConfig = Depends(load_config),
    db: Database = Depends(connect_db),
):
    if await has_tables(db):
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST)

    db.create_tables([Certificate, DistinguishedName, User, UserCapability])

    cryptContext = await config.crypto.cryptContext
    admin = User.create(
        name=admin_name,
        password=cryptContext.hash(admin_password),
    )
    UserCapability.create(user=admin, capability="admin")