import {
    EventEmitter,
    Input,
    OnInit,
    Output,
} from '@angular/core';

import { ToasterService } from 'angular2-toaster';
import { Angulartics2 } from 'angulartics2';

import { CipherService } from '../../abstractions/cipher.service';
import { CryptoService } from '../../abstractions/crypto.service';
import { I18nService } from '../../abstractions/i18n.service';
import { PlatformUtilsService } from '../../abstractions/platformUtils.service';
import { TokenService } from '../../abstractions/token.service';

import { Cipher } from '../../models/domain/cipher';

import { AttachmentView } from '../../models/view/attachmentView';
import { CipherView } from '../../models/view/cipherView';

export class AttachmentsComponent implements OnInit {
    @Input() cipherId: string;
    @Output() onUploadedAttachment = new EventEmitter();
    @Output() onDeletedAttachment = new EventEmitter();

    cipher: CipherView;
    cipherDomain: Cipher;
    hasUpdatedKey: boolean;
    canAccessAttachments: boolean;
    formPromise: Promise<any>;
    deletePromises: { [id: string]: Promise<any>; } = {};

    constructor(protected cipherService: CipherService, protected analytics: Angulartics2,
        protected toasterService: ToasterService, protected i18nService: I18nService,
        protected cryptoService: CryptoService, protected tokenService: TokenService,
        protected platformUtilsService: PlatformUtilsService, protected win: Window) { }

    async ngOnInit() {
        this.cipherDomain = await this.loadCipher();
        this.cipher = await this.cipherDomain.decrypt();

        this.hasUpdatedKey = await this.cryptoService.hasEncKey();
        const isPremium = this.tokenService.getPremium();
        this.canAccessAttachments = isPremium || this.cipher.organizationId != null;

        if (!this.canAccessAttachments) {
            const confirmed = await this.platformUtilsService.showDialog(
                this.i18nService.t('premiumRequiredDesc'), this.i18nService.t('premiumRequired'),
                this.i18nService.t('learnMore'), this.i18nService.t('cancel'));
            if (confirmed) {
                this.platformUtilsService.launchUri('https://vault.bitwarden.com/#/?premium=purchase');
            }
        } else if (!this.hasUpdatedKey) {
            const confirmed = await this.platformUtilsService.showDialog(
                this.i18nService.t('updateKey'), this.i18nService.t('featureUnavailable'),
                this.i18nService.t('learnMore'), this.i18nService.t('cancel'), 'warning');
            if (confirmed) {
                this.platformUtilsService.launchUri('https://help.bitwarden.com/article/update-encryption-key/');
            }
        }
    }

    async submit() {
        if (!this.hasUpdatedKey) {
            this.toasterService.popAsync('error', this.i18nService.t('errorOccurred'),
                this.i18nService.t('updateKey'));
            return;
        }

        const fileEl = document.getElementById('file') as HTMLInputElement;
        const files = fileEl.files;
        if (files == null || files.length === 0) {
            this.toasterService.popAsync('error', this.i18nService.t('errorOccurred'),
                this.i18nService.t('selectFile'));
            return;
        }

        if (files[0].size > 104857600) { // 100 MB
            this.toasterService.popAsync('error', this.i18nService.t('errorOccurred'),
                this.i18nService.t('maxFileSize'));
            return;
        }

        try {
            this.formPromise = this.saveCipherAttachment(files[0]);
            this.cipherDomain = await this.formPromise;
            this.cipher = await this.cipherDomain.decrypt();
            this.analytics.eventTrack.next({ action: 'Added Attachment' });
            this.toasterService.popAsync('success', null, this.i18nService.t('attachmentSaved'));
            this.onUploadedAttachment.emit();
        } catch { }

        // reset file input
        // ref: https://stackoverflow.com/a/20552042
        fileEl.type = '';
        fileEl.type = 'file';
        fileEl.value = '';
    }

    async delete(attachment: AttachmentView) {
        if (this.deletePromises[attachment.id] != null) {
            return;
        }

        const confirmed = await this.platformUtilsService.showDialog(
            this.i18nService.t('deleteAttachmentConfirmation'), this.i18nService.t('deleteAttachment'),
            this.i18nService.t('yes'), this.i18nService.t('no'), 'warning');
        if (!confirmed) {
            return;
        }

        try {
            this.deletePromises[attachment.id] = this.deleteCipherAttachment(attachment.id);
            await this.deletePromises[attachment.id];
            this.analytics.eventTrack.next({ action: 'Deleted Attachment' });
            this.toasterService.popAsync('success', null, this.i18nService.t('deletedAttachment'));
            const i = this.cipher.attachments.indexOf(attachment);
            if (i > -1) {
                this.cipher.attachments.splice(i, 1);
            }
        } catch { }

        this.deletePromises[attachment.id] = null;
        this.onDeletedAttachment.emit();
    }

    async download(attachment: AttachmentView) {
        const a = (attachment as any);
        if (a.downloading) {
            return;
        }

        if (!this.canAccessAttachments) {
            this.toasterService.popAsync('error', this.i18nService.t('premiumRequired'),
                this.i18nService.t('premiumRequiredDesc'));
            return;
        }

        a.downloading = true;
        const response = await fetch(new Request(attachment.url, { cache: 'no-cache' }));
        if (response.status !== 200) {
            this.toasterService.popAsync('error', null, this.i18nService.t('errorOccurred'));
            a.downloading = false;
            return;
        }

        try {
            const buf = await response.arrayBuffer();
            const key = await this.cryptoService.getOrgKey(this.cipher.organizationId);
            const decBuf = await this.cryptoService.decryptFromBytes(buf, key);
            this.platformUtilsService.saveFile(this.win, decBuf, null, attachment.fileName);
        } catch (e) {
            this.toasterService.popAsync('error', null, this.i18nService.t('errorOccurred'));
        }

        a.downloading = false;
    }

    protected loadCipher() {
        return this.cipherService.get(this.cipherId);
    }

    protected saveCipherAttachment(file: File) {
        return this.cipherService.saveAttachmentWithServer(this.cipherDomain, file);
    }

    protected deleteCipherAttachment(attachmentId: string) {
        return this.cipherService.deleteAttachmentWithServer(this.cipher.id, attachmentId);
    }
}