'use client';
import {Dispatch, SetStateAction, useContext, useEffect, useState} from 'react';
import {AppRouterInstance, useRouter} from '@/lib/navigation';
import {useTranslations} from '@/lib/i18n';
import {AlertContext, AlertContextProps} from '@/context/AlertContext';
import {LangContext, LangContextProps} from '@/context/LangContext';
import OfflineContext, {OfflineMode} from '@/context/OfflineContext';
import {SessionProps} from '@/lib/types/session';
import {UserProps} from '@/lib/types/user';
import {apiGet} from '@/lib/api/client';
import {isDesktop} from '@/lib/configs';
import * as tauri from '@/lib/tauri';
import {getCookie} from '@/lib/utils/cookies';

interface UseAuthenticationReturn {
    session: SessionProps;
    setSession: Dispatch<SetStateAction<SessionProps>>;
    isLoading: boolean;
    currentCredits: number;
    setCurrentCredits: Dispatch<SetStateAction<number>>;
    amountSpent: number;
    setAmountSpent: Dispatch<SetStateAction<number>>;
    showPinSetup: boolean;
    setShowPinSetup: Dispatch<SetStateAction<boolean>>;
    showPinVerify: boolean;
    setShowPinVerify: Dispatch<SetStateAction<boolean>>;
    handlePinVerifySuccess: (userId: string) => Promise<void>;
}

export default function useAuthentication(): UseAuthenticationReturn {
    const t = useTranslations();
    const {lang: locale}: LangContextProps = useContext<LangContextProps>(LangContext);
    const {errorMessage}: AlertContextProps = useContext<AlertContextProps>(AlertContext);
    const {initializeDatabase, setOfflineMode} = useContext(OfflineContext);
    const router: AppRouterInstance = useRouter();

    const [session, setSession] = useState<SessionProps>({user: null, accessToken: '', isConnected: false});
    const [currentCredits, setCurrentCredits] = useState<number>(0);
    const [amountSpent, setAmountSpent] = useState<number>(session.user?.aiUsage || 0);
    const [isLoading, setIsLoading] = useState<boolean>(true);
    const [sessionAttempts, setSessionAttempts] = useState<number>(0);
    const [showPinSetup, setShowPinSetup] = useState<boolean>(false);
    const [showPinVerify, setShowPinVerify] = useState<boolean>(false);

    useEffect((): void => {
        checkAuthentification().then();
    }, []);

    useEffect((): void => {
        if (session.isConnected) {
            setIsLoading(false);
        } else {
            if (sessionAttempts > 2) {
                router.push('/');
            }
        }
        setSessionAttempts(sessionAttempts + 1);
    }, [session]);

    async function checkAuthentification(): Promise<void> {
        const token: string | null = isDesktop ? await tauri.getToken() : getCookie('token');

        if (token) {
            try {
                const user: UserProps = await apiGet<UserProps>('user/infos', token, locale);
                if (!user) {
                    errorMessage(t('homePage.errors.userNotFound'));
                    if (isDesktop) {
                        await tauri.removeToken();
                        await tauri.logout();
                    }
                    return;
                }

                if (isDesktop && user.id) {
                    try {
                        const initResult = await tauri.initUser(user.id);
                        if (!initResult.success) {
                            errorMessage(initResult.error || t('homePage.errors.offlineInitError'));
                            return;
                        }
                        try {
                            const offlineStatus = await tauri.offlineModeGet();
                            if (!offlineStatus.hasPin && user.termsAccepted) {
                                setTimeout((): void => {
                                    setShowPinSetup(true);
                                }, 2000);
                            }
                        } catch (error) {
                            errorMessage(t('homePage.errors.offlineModeError'));
                        }
                    } catch (error) {
                        errorMessage(t('homePage.errors.offlineInitError'));
                    }

                    try {
                        const dbInitialized: boolean = await initializeDatabase(user.id);
                        if (dbInitialized) {
                            try {
                                await tauri.syncUser({
                                    userId: user.id,
                                    username: user.username || '',
                                    email: user.email || ''
                                });
                            } catch (syncError) {
                                errorMessage(t('homePage.errors.syncError'));
                            }
                        }
                    } catch (error) {
                        errorMessage(t('homePage.errors.syncError'));
                    }
                }

                setSession({
                    isConnected: true,
                    user: user,
                    accessToken: token,
                });
                setCurrentCredits(user.creditsBalance);
                setAmountSpent(user.aiUsage);
            } catch (e: unknown) {
                if (isDesktop) {
                    try {
                        const offlineStatus = await tauri.offlineModeGet();
                        if (offlineStatus.hasPin && offlineStatus.lastUserId) {
                            setOfflineMode((prev: OfflineMode): OfflineMode => ({
                                ...prev,
                                isOffline: true,
                                isNetworkOnline: false
                            }));
                            setShowPinVerify(true);
                            setIsLoading(false);
                            return;
                        } else {
                            await tauri.removeToken();
                            await tauri.logout();
                        }
                    } catch (offlineError) {
                        errorMessage(t('homePage.errors.offlineError'));
                    }
                } else {
                    window.location.href = 'https://eritors.com/login';
                }

                if (e instanceof Error) {
                    errorMessage(e.message);
                } else {
                    errorMessage(t('homePage.errors.authenticationError'));
                }
            }
        } else {
            if (isDesktop) {
                try {
                    const offlineStatus = await tauri.offlineModeGet();
                    if (offlineStatus.hasPin && offlineStatus.lastUserId) {
                        setOfflineMode((prev: OfflineMode): OfflineMode => ({
                            ...prev,
                            isOffline: true,
                            isNetworkOnline: false
                        }));
                        setShowPinVerify(true);
                        setIsLoading(false);
                        return;
                    }
                } catch (error) {
                    errorMessage(t('homePage.errors.authenticationError'));
                }
                await tauri.openLoginWindow();
            } else {
                window.location.href = 'https://eritors.com/login';
            }
        }
    }

    async function handlePinVerifySuccess(userId: string): Promise<void> {
        try {
            const storedToken: string | null = await tauri.getToken();
            const encryptionKey: string | null = await tauri.getUserEncryptionKey(userId);

            if (encryptionKey) {
                await tauri.dbInitialize(userId, encryptionKey);
                setOfflineMode((prev: OfflineMode): OfflineMode => ({
                    ...prev,
                    isDatabaseInitialized: true
                }));

                const localUser: UserProps = await tauri.getUserInfo();
                if (localUser && localUser.id) {
                    setSession({
                        isConnected: true,
                        user: localUser,
                        accessToken: storedToken || '',
                    });
                    setShowPinVerify(false);
                    setCurrentCredits(localUser.creditsBalance || 0);
                    setAmountSpent(localUser.aiUsage || 0);
                } else {
                    errorMessage(t('homePage.errors.localDataError'));
                }
            } else {
                errorMessage(t('homePage.errors.encryptionKeyError'));
            }
        } catch (error) {
            errorMessage(t('homePage.errors.offlineModeError'));
        }
    }

    return {
        session,
        setSession,
        isLoading,
        currentCredits,
        setCurrentCredits,
        amountSpent,
        setAmountSpent,
        showPinSetup,
        setShowPinSetup,
        showPinVerify,
        setShowPinVerify,
        handlePinVerifySuccess,
    };
}