'use strict';

const router = require('../router.js');
const api = require('../api.js');
const misc = require('../util/misc.js');
const settings = require('../models/settings.js');
const Post = require('../models/post.js');
const PostList = require('../models/post_list.js');
const PostDetailView = require('../views/post_detail_view.js');
const BasePostController = require('./base_post_controller.js');
const EmptyView = require('../views/empty_view.js');

class PostDetailController extends BasePostController {
    constructor(ctx, section) {
        super(ctx);

        Post.get(ctx.parameters.id).then(post => {
            this._id = ctx.parameters.id;
            post.addEventListener('change', e => this._evtSaved(e, section));

            this._installView(post, section);
        }, errorMessage => {
            this._view = new EmptyView();
            this._view.showError(errorMessage);
        });
    }

    showSuccess(message) {
        this._view.showSuccess(message);
    }

    _installView(post, section) {
        this._view = new PostDetailView({
            post: post,
            section: section,
            canMerge: api.hasPrivilege('posts:merge'),
        });

        this._view.addEventListener('select', e => this._evtSelect(e));
        this._view.addEventListener('merge', e => this._evtMerge(e));
    }

    _evtSelect(e) {
        this._view.clearMessages();
        this._view.disableForm();
        Post.get(e.detail.postId).then(post => {
            this._view.selectPost(post);
            this._view.enableForm();
        }, errorMessage => {
            this._view.showError(errorMessage);
            this._view.enableForm();
        });
    }

    _evtSaved(e, section) {
        misc.disableExitConfirmation();
        if (this._id !== e.detail.post.id) {
            router.replace(
                '/post/' + e.detail.post.id + '/' + section, null, false);
        }
    }

    _evtMerge(e) {
        this._view.clearMessages();
        this._view.disableForm();
        e.detail.post.merge(e.detail.targetPost.id, e.detail.useOldContent)
            .then(() => {
                this._installView(e.detail.post, 'merge');
                this._view.showSuccess('Post merged.');
                router.replace(
                    '/post/' + e.detail.targetPost.id + '/merge', null, false);
            }, errorMessage => {
                this._view.showError(errorMessage);
                this._view.enableForm();
            });
    }
}

module.exports = router => {
    router.enter(
        '/post/:id/merge',
        (ctx, next) => {
            ctx.controller = new PostDetailController(ctx, 'merge');
        });
};