import { CommandContext, Filter } from "https://deno.land/x/grammy/mod.ts";
import { Kysely, Transaction } from 'npm:kysely';
import { Ctx } from "../ctx.ts";
import { Database } from "../../repo/exports.ts";
import { checkUserRestrictions } from "../../core/users.ts";
import { UserCheckedRestrictions } from "../../core/entities.ts";
import { BotConfig } from "../../cfg/config.ts";


export interface CheckUserOut extends UserCheckedRestrictions {
    isNewUser:         boolean
    isChatParticipant: boolean
    isCaptchaSolved:   boolean
}


// Checks user if it's banned, timeout and if it exists overall
// Creates new user if it doesn't exist yet
// Ignores the start command
export const checkUser = async (
    ctx:        Ctx,
    db:         Kysely<Database>,
    cfg:        BotConfig,
    isMicChat?: boolean,
): Promise<CheckUserOut> => {
    const out: CheckUserOut = {
        isBlocked: false,
        isTimeout: false,
        isNewUser: false,
        isChatParticipant: true,
        isCaptchaSolved: false,
    }

    if (!ctx.chat || !ctx.from) return out
    isMicChat ??= ctx.chat.id === cfg.chat_id

    await db.transaction().execute(async trx => {
        const users = await trx.selectFrom('users')
            .selectAll().where('tg_id', '=', ctx.from!.id).execute()
        if (users.length < 1) {
            await trx.insertInto('users').values({
                tg_id: ctx.from!.id,
                joined_by_referal_from_user_id: null,
                is_chat_participant: isMicChat,
                is_captcha_passed: isMicChat,
                joined_chat_at: new Date,
                timeout_until: null
            }).execute()
            out.isNewUser = true
            out.isChatParticipant = isMicChat
            out.isCaptchaSolved = out.isChatParticipant
        } else {
            const user = users[0]
            const userRestrictions = await checkUserRestrictions(db, user)

            if (!user.is_chat_participant && isMicChat) {
                await trx.updateTable('users').set({
                    is_chat_participant: true,
                    is_captcha_passed: true,
                }).execute()
            }

            out.isBlocked = userRestrictions.isBlocked
            out.isTimeout = userRestrictions.isTimeout
            out.isChatParticipant = user.is_chat_participant || isMicChat
            out.isCaptchaSolved = user.is_captcha_passed
        }
    })

    return out
}



interface CheckUserOnNewChatMemberOut extends CheckUserOut {
    isExpectedUserJoined: boolean
    expectedUserTgId:     number
}

// Extends checkUser function with checking invite link functionality
export const checkUserOnNewChatMember = async (
    ctx:          Filter<Ctx, "chat_member">,
    db:           Kysely<Database> | Transaction<Database>,
    cfg:          BotConfig
): Promise<CheckUserOnNewChatMemberOut> => {
    const out: CheckUserOnNewChatMemberOut = {
        isBlocked:            false,
        isTimeout:            false,
        isNewUser:            false,
        isCaptchaSolved:      false,
        isExpectedUserJoined: true,
        isChatParticipant:    true,
        expectedUserTgId:     -1,
    }

    const userInfo = await checkUser(ctx, db, cfg, true)
    if (userInfo.isBlocked) {
        ctx.banChatMember(ctx.chatMember.from.id).catch(
            err => console.log(err)
        )
        out.isBlocked = true
        out.isChatParticipant = false
        return out
    }
    out.isTimeout = userInfo.isTimeout
    out.isCaptchaSolved = userInfo.isCaptchaSolved
    out.isNewUser = userInfo.isNewUser

    if (!ctx.chatMember.invite_link) return out
    const { invite_link } = ctx.chatMember.invite_link

    const inviteLinksData = await db.selectFrom('invite_links')
        .select('expect_user_tg_id')
        .where('link', '=', invite_link).execute()
    if (inviteLinksData.length === 0) {
        out.expectedUserTgId = -1
    } else {
        const { expect_user_tg_id } = inviteLinksData[0]
        out.isExpectedUserJoined = expect_user_tg_id === ctx.chatMember.from.id
        out.expectedUserTgId = expect_user_tg_id
        db.deleteFrom('invite_links').where('link', '=', invite_link).execute()
        ctx.revokeChatInviteLink(invite_link)
    }

    if (!out.isExpectedUserJoined) {
        db.updateTable('users').where(eb => eb.or([
            eb('tg_id', '=', out.expectedUserTgId),
            eb('tg_id', '=', ctx.chatMember.from.id),
        ])).execute()
        ctx.banChatMember(ctx.chatMember.from.id).catch()
    }

    return out
}



export const checkUserOnStart = async (
    ctx: CommandContext<Ctx>,
    db:  Kysely<Database>,
): Promise<CheckUserOut> => {
    let isBlocked:         boolean = false
    let isTimeout:         boolean = false
    let isNewUser:         boolean = false
    let isChatParticipant: boolean = false
    let isCaptchaSolved:   boolean = false

    await db.transaction().execute(async trx => {
        const users = await trx.selectFrom('users')
            .select([
                'id',
                'tg_id',
                'is_captcha_passed',
                'is_banned',
                'is_timeout',
                'is_chat_participant',
                'timeout_until'
            ])
            .where('tg_id', '=', ctx.msg.from!.id).execute()
        if (users.length < 1) {
            // TODO -- referal links support
            // const referal = ctx.match

            await trx.insertInto('users').values({
                tg_id: ctx.msg.from?.id
            }).execute()
            isNewUser = true
        } else {
            const user = users[0]
            const userRestrictions = await checkUserRestrictions(db, user)
            isBlocked = userRestrictions.isBlocked
            isTimeout = userRestrictions.isTimeout
            isChatParticipant = user.is_chat_participant
            isCaptchaSolved = user.is_captcha_passed
        }
    })
    return {
        isBlocked,
        isTimeout,
        isNewUser,
        isChatParticipant,
        isCaptchaSolved
    }
}


export const onMemberLeftChat = async (
    ctx: Filter<Ctx, "chat_member">,
    db:  Kysely<Database>,
) => {
    await db.updateTable('users')
    .where('tg_id', '=', ctx.chatMember.from.id).set({
        is_chat_participant: false
    }).execute()
}