<template>
    <div class="layout-wrapper">
        <router-link to="/">
            <div class="auth-logo d-flex align-start gap-x-3">
                <img alt="logo" class="login-page-logo" :src="APPLICATION_LOGO_PATH" />
                <h1 class="font-weight-medium leading-normal text-2xl">{{ tt('global.app.title') }}</h1>
            </div>
        </router-link>
        <v-row no-gutters class="auth-wrapper">
            <v-col cols="12" md="8" class="d-none d-md-flex align-center justify-center position-relative">
                <div class="d-flex auth-img-footer" v-if="!isDarkMode">
                    <v-img src="img/desktop/background.svg"/>
                </div>
                <div class="d-flex auth-img-footer" v-if="isDarkMode">
                    <v-img src="img/desktop/background-dark.svg"/>
                </div>
                <div class="d-flex align-center justify-center w-100 pt-10">
                    <v-img max-width="600px" src="img/desktop/people4.svg"/>
                </div>
            </v-col>
            <v-col cols="12" md="4" class="auth-card d-flex flex-column">
                <div class="d-flex align-center justify-center h-100">
                    <v-card variant="flat" class="w-100 mt-0 px-4 pt-12" max-width="500">
                        <v-card-text>
                            <h4 class="text-h4 mb-2">{{ tt('Reset Password') }}</h4>
                            <p class="mb-0">{{ tt('Please re-enter your email address, and then enter a new password.') }}</p>
                        </v-card-text>

                        <v-card-text class="pb-0 mb-6">
                            <v-form>
                                <v-row>
                                    <v-col cols="12">
                                        <v-text-field
                                            type="email"
                                            autocomplete="email"
                                            autofocus="autofocus"
                                            :disabled="updating"
                                            :label="tt('E-mail')"
                                            :placeholder="tt('Your email address')"
                                            v-model="email"
                                            @keyup.enter="passwordInput?.focus()"
                                        />
                                    </v-col>

                                    <v-col cols="12">
                                        <v-text-field
                                            autocomplete="new-password"
                                            ref="passwordInput"
                                            type="password"
                                            :disabled="updating"
                                            :label="tt('Password')"
                                            :placeholder="tt('Your password')"
                                            v-model="newPassword"
                                            @keyup.enter="confirmPasswordInput?.focus()"
                                        />
                                    </v-col>

                                    <v-col cols="12">
                                        <v-text-field
                                            ref="confirmPasswordInput"
                                            type="password"
                                            :disabled="updating"
                                            :label="tt('Confirm Password')"
                                            :placeholder="tt('Re-enter the password')"
                                            v-model="confirmPassword"
                                            @keyup.enter="resetPassword"
                                        />
                                    </v-col>

                                    <v-col cols="12">
                                        <v-btn block :disabled="!email || !newPassword || !confirmPassword || updating" @click="resetPassword">
                                            {{ tt('Update Password') }}
                                            <v-progress-circular indeterminate size="22" class="ml-2" v-if="updating"></v-progress-circular>
                                        </v-btn>
                                    </v-col>

                                    <v-col cols="12">
                                        <router-link class="d-flex align-center justify-center" to="/login"
                                                     :class="{ 'disabled': updating }">
                                            <v-icon :icon="icons.left"/>
                                            <span>{{ tt('Back to login page') }}</span>
                                        </router-link>
                                    </v-col>
                                </v-row>
                            </v-form>
                        </v-card-text>
                    </v-card>
                </div>
                <v-spacer/>
                <div class="d-flex align-center justify-center">
                    <v-card variant="flat" class="w-100 px-4 pb-4" max-width="500">
                        <v-card-text class="pt-0">
                            <v-row>
                                <v-col cols="12" class="text-center">
                                    <v-menu location="bottom">
                                        <template #activator="{ props }">
                                            <v-btn variant="text"
                                                   :disabled="updating"
                                                   v-bind="props">{{ currentLanguageName }}</v-btn>
                                        </template>
                                        <v-list>
                                            <v-list-item v-for="lang in allLanguages" :key="lang.languageTag">
                                                <v-list-item-title
                                                    class="cursor-pointer"
                                                    @click="changeLanguage(lang.languageTag)">
                                                    {{ lang.displayName }}
                                                </v-list-item-title>
                                            </v-list-item>
                                        </v-list>
                                    </v-menu>
                                </v-col>

                                <v-col cols="12" class="d-flex align-center pt-0">
                                    <v-divider />
                                </v-col>

                                <v-col cols="12" class="text-center text-sm">
                                    <span>Powered by </span>
                                    <a href="https://github.com/mayswind/ezbookkeeping" target="_blank">ezBookkeeping</a>&nbsp;<span>{{ version }}</span>
                                </v-col>
                            </v-row>
                        </v-card-text>
                    </v-card>
                </div>
            </v-col>
        </v-row>

        <confirm-dialog ref="confirmDialog"/>
        <snack-bar ref="snackbar" @update:show="onSnackbarShowStateChanged" />
    </div>
</template>

<script setup lang="ts">
import { VTextField } from 'vuetify/components/VTextField';
import ConfirmDialog from '@/components/desktop/ConfirmDialog.vue';
import SnackBar from '@/components/desktop/SnackBar.vue';

import { ref, computed, useTemplateRef } from 'vue';
import { useRouter } from 'vue-router';
import { useTheme } from 'vuetify';

import type { LanguageOption } from '@/locales/index.ts';
import { useI18n } from '@/locales/helpers.ts';

import { useRootStore } from '@/stores/index.js';
import { useSettingsStore } from '@/stores/setting.ts';

import { APPLICATION_LOGO_PATH } from '@/consts/asset.ts';
import { ThemeType } from '@/core/theme.ts';
import { getVersion } from '@/lib/version.ts';

import {
    mdiChevronLeft
} from '@mdi/js';

type ConfirmDialogType = InstanceType<typeof ConfirmDialog>;
type SnackBarType = InstanceType<typeof SnackBar>;

const props = defineProps<{
    token: string;
}>();

const router = useRouter();
const theme = useTheme();

const { tt, getCurrentLanguageDisplayName, getAllLanguageOptions, setLanguage } = useI18n();

const rootStore = useRootStore();
const settingsStore = useSettingsStore();

const icons = {
    left: mdiChevronLeft
};

const version = `v${getVersion()}`;

const passwordInput = useTemplateRef<VTextField>('passwordInput');
const confirmPasswordInput = useTemplateRef<VTextField>('confirmPasswordInput');
const confirmDialog = useTemplateRef<ConfirmDialogType>('confirmDialog');
const snackbar = useTemplateRef<SnackBarType>('snackbar');

const email = ref<string>('');
const newPassword = ref<string>('');
const confirmPassword = ref<string>('');
const updating = ref<boolean>(false);
const passwordChanged = ref<boolean>(false);

const allLanguages = computed<LanguageOption[]>(() => getAllLanguageOptions(false));
const isDarkMode = computed<boolean>(() => theme.global.name.value === ThemeType.Dark);
const currentLanguageName = computed<string>(() => getCurrentLanguageDisplayName());

const inputProblemMessage = computed<string | null>(() => {
    if (!email.value) {
        return 'Email address cannot be blank';
    } else if (!newPassword.value && !confirmPassword.value) {
        return 'Nothing has been modified';
    } else if (!newPassword.value && confirmPassword.value) {
        return 'New password cannot be blank';
    } else if (newPassword.value && !confirmPassword.value) {
        return 'Password confirmation cannot be blank';
    } else if (newPassword.value && confirmPassword.value && newPassword.value !== confirmPassword.value) {
        return 'Password and password confirmation do not match';
    } else {
        return null;
    }
});

function changeLanguage(locale: string): void {
    const localeDefaultSettings = setLanguage(locale);
    settingsStore.updateLocalizedDefaultSettings(localeDefaultSettings);
}

function onSnackbarShowStateChanged(newValue: boolean): void {
    if (!newValue && passwordChanged.value) {
        router.replace('/login');
    }
}

function resetPassword(): void  {
    passwordChanged.value = false;

    const problemMessage = inputProblemMessage.value;

    if (problemMessage) {
        snackbar.value?.showMessage(problemMessage);
        return;
    }

    updating.value = true;

    rootStore.resetPassword({
        token: props.token,
        email: email.value,
        password: newPassword.value
    }).then(() => {
        updating.value = false;
        passwordChanged.value = true;
        snackbar.value?.showMessage('Password has been updated');
    }).catch(error => {
        updating.value = false;
        passwordChanged.value = false;

        if (!error.processed) {
            snackbar.value?.showError(error);
        }
    });
}
</script>
