<template>
    <v-row>
        <v-col cols="12">
            <v-card :title="$t('Application Lock')">
                <v-card-text class="pb-0">
                    <p class="text-body-1 font-weight-semibold" v-if="!isEnableApplicationLock">
                        {{ $t('Application lock is not enabled') }}
                    </p>
                    <p class="text-body-1" v-if="isEnableApplicationLock">
                        {{ $t('Application lock has been enabled') }}
                    </p>
                </v-card-text>

                <v-card-text v-if="isEnableApplicationLock">
                    <v-switch :disabled="true"
                              :label="$t('Unlock By PIN Code')"
                              v-model="isEnableApplicationLock"/>
                    <v-switch class="mt-2" :label="$t('Unlock By WebAuthn')"
                              :loading="enablingWebAuthn"
                              v-model="isEnableApplicationLockWebAuthn"/>
                </v-card-text>

                <v-card-text class="pb-0">
                    <p class="text-body-1 font-weight-semibold" v-if="!isEnableApplicationLock">
                        {{ $t('Please input a new 6-digit PIN code. PIN code would encrypt your local data, so you need input this PIN code when you launch this app. If this PIN code is lost, you should re-login.') }}
                    </p>
                    <p class="text-body-1 font-weight-semibold" v-if="isEnableApplicationLock">
                        {{ $t('Please enter your current PIN code when disable application lock.') }}
                    </p>
                </v-card-text>

                <v-card-text class="pb-0">
                    <v-row class="mb-3">
                        <v-col cols="12" md="12">
                            <div style="max-width: 428px">
                                <pin-code-input :secure="true" :length="6" v-model="pinCode" />
                            </div>
                        </v-col>
                    </v-row>
                </v-card-text>

                <v-card-text>
                    <v-row>
                        <v-col cols="12" class="d-flex flex-wrap gap-4">
                            <v-btn :disabled="!pinCodeValid"
                                   v-if="!isEnableApplicationLock" @click="enable">
                                {{ $t('Enable Application Lock') }}
                            </v-btn>
                            <v-btn :disabled="!pinCodeValid"
                                   v-if="isEnableApplicationLock" @click="disable">
                                {{ $t('Disable Application Lock') }}
                            </v-btn>
                        </v-col>
                    </v-row>
                </v-card-text>
            </v-card>
        </v-col>
    </v-row>

    <snack-bar ref="snackbar" />
</template>

<script>
import { mapStores } from 'pinia';
import { useSettingsStore } from '@/stores/setting.js';
import { useUserStore } from '@/stores/user.js';

import logger from '@/lib/logger.js';
import webauthn from '@/lib/webauthn.js';

export default {
    data() {
        return {
            isSupportedWebAuthn: false,
            enablingWebAuthn: false,
            pinCode: ''
        };
    },
    computed: {
        ...mapStores(useSettingsStore, useUserStore),
        isEnableApplicationLock: {
            get: function () {
                return this.settingsStore.appSettings.applicationLock;
            },
            set: function (value) {
                this.settingsStore.setEnableApplicationLock(value);
            }
        },
        isEnableApplicationLockWebAuthn: {
            get: function () {
                return this.settingsStore.appSettings.applicationLockWebAuthn;
            },
            set: function (value) {
                this.settingsStore.setEnableApplicationLockWebAuthn(value);
            }
        },
        pinCodeValid() {
            return this.pinCode && this.pinCode.length === 6;
        }
    },
    watch: {
        isEnableApplicationLockWebAuthn: function (newValue) {
            const self = this;

            if (newValue) {
                self.enablingWebAuthn = true;

                webauthn.registerCredential(
                    self.$user.getUserAppLockState(),
                    self.userStore.currentUserInfo,
                ).then(({ id }) => {
                    self.enablingWebAuthn = false;

                    self.$user.saveWebAuthnConfig(id);
                    self.settingsStore.setEnableApplicationLockWebAuthn(true);
                    self.$refs.snackbar.showMessage('You have enabled WebAuthn successfully');
                }).catch(error => {
                    logger.error('failed to enable WebAuthn', error);

                    self.enablingWebAuthn = false;

                    if (error.notSupported) {
                        self.$refs.snackbar.showMessage('This device does not support WebAuthn');
                    } else if (error.name === 'NotAllowedError') {
                        self.$refs.snackbar.showMessage('User has canceled authentication');
                    } else if (error.invalid) {
                        self.$refs.snackbar.showMessage('Failed to enable WebAuthn');
                    } else {
                        self.$refs.snackbar.showMessage('User has canceled or this device does not support WebAuthn');
                    }

                    self.isEnableApplicationLockWebAuthn = false;
                    self.settingsStore.setEnableApplicationLockWebAuthn(false);
                    self.$user.clearWebAuthnConfig();
                });
            } else {
                self.settingsStore.setEnableApplicationLockWebAuthn(false);
                self.$user.clearWebAuthnConfig();
            }
        }
    },
    created() {
        const self = this;
        webauthn.isCompletelySupported().then(result => {
            self.isSupportedWebAuthn = result;
        });
    },
    methods: {
        enable() {
            if (this.settingsStore.appSettings.applicationLock) {
                this.$refs.snackbar.showMessage('Application lock has been enabled');
                return;
            }

            if (!this.pinCode || this.pinCode.length !== 6) {
                this.pinCode = '';
                this.$refs.snackbar.showMessage('PIN code is invalid');
                return;
            }

            const user = this.userStore.currentUserInfo;

            if (!user || !user.username) {
                this.pinCode = '';
                this.$refs.snackbar.showMessage('An error has occurred');
                return;
            }

            this.$user.encryptToken(user.username, this.pinCode);
            this.settingsStore.setEnableApplicationLock(true);

            this.settingsStore.setEnableApplicationLockWebAuthn(false);
            this.$user.clearWebAuthnConfig();

            this.pinCode = '';
        },
        disable() {
            if (!this.settingsStore.appSettings.applicationLock) {
                this.$refs.snackbar.showMessage('Application lock is not enabled');
                return;
            }

            if (!this.$user.isCorrectPinCode(this.pinCode)) {
                this.pinCode = '';
                this.$refs.snackbar.showMessage('PIN code is wrong');
                return;
            }

            this.pinCode = '';

            this.$user.decryptToken();
            this.settingsStore.setEnableApplicationLock(false);

            this.settingsStore.setEnableApplicationLockWebAuthn(false);
            this.$user.clearWebAuthnConfig();
        }
    }
}
</script>
