import Component from '@ember/component';
import boundOneWay from 'ghost-admin/utils/bound-one-way';
import moment from 'moment';
import {action} from '@ember/object';
import {alias, or} from '@ember/object/computed';
import {computed} from '@ember/object';
import {inject as service} from '@ember/service';

export default Component.extend({
    feature: service(),
    store: service(),
    config: service(),
    ajax: service(),
    ghostPaths: service(),
    notifications: service(),
    slugGenerator: service(),
    session: service(),
    settings: service(),
    ui: service(),

    tagName: '',

    post: null,

    isViewingSubview: false,

    canonicalUrlScratch: alias('post.canonicalUrlScratch'),
    customExcerptScratch: alias('post.customExcerptScratch'),
    codeinjectionFootScratch: alias('post.codeinjectionFootScratch'),
    codeinjectionHeadScratch: alias('post.codeinjectionHeadScratch'),
    metaDescriptionScratch: alias('post.metaDescriptionScratch'),
    metaTitleScratch: alias('post.metaTitleScratch'),
    ogDescriptionScratch: alias('post.ogDescriptionScratch'),
    ogTitleScratch: alias('post.ogTitleScratch'),
    twitterDescriptionScratch: alias('post.twitterDescriptionScratch'),
    twitterTitleScratch: alias('post.twitterTitleScratch'),
    slugValue: boundOneWay('post.slug'),
    uuidValue: boundOneWay('post.uuid'),

    seoDescription: or('metaDescriptionScratch', 'customExcerptScratch', 'post.excerpt'),
    facebookDescription: or('ogDescriptionScratch', 'customExcerptScratch', 'seoDescription', 'post.excerpt', 'settings.description', ''),
    facebookImage: or('post.ogImage', 'post.featureImage', 'settings.ogImage', 'settings.coverImage'),
    facebookTitle: or('ogTitleScratch', 'seoTitle'),
    twitterDescription: or('twitterDescriptionScratch', 'customExcerptScratch', 'seoDescription', 'post.excerpt', 'settings.description', ''),
    twitterImage: or('post.twitterImage', 'post.featureImage', 'settings.twitterImage', 'settings.coverImage'),
    twitterTitle: or('twitterTitleScratch', 'seoTitle'),
    showVisibilityInput: or('session.user.isOwnerOnly', 'session.user.isAdminOnly', 'session.user.isEditor'),
    showEmailNewsletter: or('session.user.isOwnerOnly', 'session.user.isAdminOnly', 'session.user.isEditor'),

    seoTitle: computed('metaTitleScratch', 'post.titleScratch', function () {
        return this.metaTitleScratch || this.post.titleScratch || '(Untitled)';
    }),

    seoURL: computed('post.{slug,canonicalUrl}', 'config.blogUrl', function () {
        const urlParts = [];

        if (this.post.canonicalUrl) {
            try {
                const canonicalUrl = new URL(this.post.canonicalUrl);
                urlParts.push(canonicalUrl.host);
                urlParts.push(...canonicalUrl.pathname.split('/').reject(p => !p));
            } catch (e) {
                // no-op, invalid URL
            }
        } else {
            const blogUrl = new URL(this.config.get('blogUrl'));
            urlParts.push(blogUrl.host);
            urlParts.push(...blogUrl.pathname.split('/').reject(p => !p));
            urlParts.push(this.post.slug);
        }

        return urlParts.join(' › ');
    }),

    willDestroyElement() {
        this._super(...arguments);

        let post = this.post;
        let errors = post.get('errors');

        // reset the publish date if it has an error
        if (errors.has('publishedAtBlogDate') || errors.has('publishedAtBlogTime')) {
            post.set('publishedAtBlogTZ', post.get('publishedAtUTC'));
            post.validate({attribute: 'publishedAtBlog'});
        }

        this.setSidebarWidthVariable(0);
    },

    actions: {
        showSubview(subview) {
            this.set('isViewingSubview', true);
            this.set('subview', subview);
        },

        closeSubview() {
            this.set('isViewingSubview', false);
            this.set('subview', null);
        },

        discardEnter() {
            return false;
        },

        toggleFeatured() {
            this.toggleProperty('post.featured');

            // If this is a new post.  Don't save the post.  Defer the save
            // to the user pressing the save button
            if (this.get('post.isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                this.post.rollbackAttributes();
            });
        },

        /**
         * triggered by user manually changing slug
         */
        updateSlug(newSlug) {
            return this.updateSlugTask
                .perform(newSlug)
                .catch((error) => {
                    this.showError(error);
                    this.post.rollbackAttributes();
                });
        },

        setPublishedAtBlogDate(date) {
            let post = this.post;
            let dateString = moment(date).format('YYYY-MM-DD');

            post.get('errors').remove('publishedAtBlogDate');

            if (post.get('isNew') || date === post.get('publishedAtBlogDate')) {
                post.validate({property: 'publishedAtBlog'});
            } else {
                post.set('publishedAtBlogDate', dateString);
                return this.savePostTask.perform();
            }
        },

        async setVisibility(segment) {
            this.post.set('visibilityFilter', segment);
            try {
                await this.post.validate({property: 'visibility'});
                await this.post.validate({property: 'visibilityFilter'});
                if (this.post.get('isDraft') && this.post.changedAttributes().visibilityFilter) {
                    await this.savePostTask.perform();
                }
            } catch (e) {
                if (!e) {
                    // validation error
                    return;
                }

                throw e;
            }
        },

        setPublishedAtBlogTime(time) {
            let post = this.post;

            post.get('errors').remove('publishedAtBlogDate');

            if (post.get('isNew') || time === post.get('publishedAtBlogTime')) {
                post.validate({property: 'publishedAtBlog'});
            } else {
                post.set('publishedAtBlogTime', time);
                return this.savePostTask.perform();
            }
        },

        setCustomExcerpt(excerpt) {
            let post = this.post;
            let currentExcerpt = post.get('customExcerpt');

            if (excerpt === currentExcerpt) {
                return;
            }

            post.set('customExcerpt', excerpt);

            return post.validate({property: 'customExcerpt'}).then(() => this.savePostTask.perform());
        },

        setHeaderInjection(code) {
            let post = this.post;
            let currentCode = post.get('codeinjectionHead');

            if (code === currentCode) {
                return;
            }

            post.set('codeinjectionHead', code);

            return post.validate({property: 'codeinjectionHead'}).then(() => this.savePostTask.perform());
        },

        setFooterInjection(code) {
            let post = this.post;
            let currentCode = post.get('codeinjectionFoot');

            if (code === currentCode) {
                return;
            }

            post.set('codeinjectionFoot', code);

            return post.validate({property: 'codeinjectionFoot'}).then(() => this.savePostTask.perform());
        },

        setMetaTitle(metaTitle) {
            // Grab the post and current stored meta title
            let post = this.post;
            let currentTitle = post.get('metaTitle');

            // If the title entered matches the stored meta title, do nothing
            if (currentTitle === metaTitle) {
                return;
            }

            // If the title entered is different, set it as the new meta title
            post.set('metaTitle', metaTitle);

            // Make sure the meta title is valid and if so, save it into the post
            return post.validate({property: 'metaTitle'}).then(() => {
                if (post.get('isNew')) {
                    return;
                }

                return this.savePostTask.perform();
            });
        },

        setMetaDescription(metaDescription) {
            // Grab the post and current stored meta description
            let post = this.post;
            let currentDescription = post.get('metaDescription');

            // If the title entered matches the stored meta title, do nothing
            if (currentDescription === metaDescription) {
                return;
            }

            // If the title entered is different, set it as the new meta title
            post.set('metaDescription', metaDescription);

            // Make sure the meta title is valid and if so, save it into the post
            return post.validate({property: 'metaDescription'}).then(() => {
                if (post.get('isNew')) {
                    return;
                }

                return this.savePostTask.perform();
            });
        },

        setCanonicalUrl(value) {
            // Grab the post and current stored meta description
            let post = this.post;
            let currentCanonicalUrl = post.canonicalUrl;

            // If the value entered matches the stored value, do nothing
            if (currentCanonicalUrl === value) {
                return;
            }

            // If the value supplied is different, set it as the new value
            post.set('canonicalUrl', value);

            // Make sure the value is valid and if so, save it into the post
            return post.validate({property: 'canonicalUrl'}).then(() => {
                if (post.get('isNew')) {
                    return;
                }

                return this.savePostTask.perform();
            });
        },

        setOgTitle(ogTitle) {
            // Grab the post and current stored facebook title
            let post = this.post;
            let currentTitle = post.get('ogTitle');

            // If the title entered matches the stored facebook title, do nothing
            if (currentTitle === ogTitle) {
                return;
            }

            // If the title entered is different, set it as the new facebook title
            post.set('ogTitle', ogTitle);

            // Make sure the facebook title is valid and if so, save it into the post
            return post.validate({property: 'ogTitle'}).then(() => {
                if (post.get('isNew')) {
                    return;
                }

                return this.savePostTask.perform();
            });
        },

        setOgDescription(ogDescription) {
            // Grab the post and current stored facebook description
            let post = this.post;
            let currentDescription = post.get('ogDescription');

            // If the title entered matches the stored facebook description, do nothing
            if (currentDescription === ogDescription) {
                return;
            }

            // If the description entered is different, set it as the new facebook description
            post.set('ogDescription', ogDescription);

            // Make sure the facebook description is valid and if so, save it into the post
            return post.validate({property: 'ogDescription'}).then(() => {
                if (post.get('isNew')) {
                    return;
                }

                return this.savePostTask.perform();
            });
        },

        setTwitterTitle(twitterTitle) {
            // Grab the post and current stored twitter title
            let post = this.post;
            let currentTitle = post.get('twitterTitle');

            // If the title entered matches the stored twitter title, do nothing
            if (currentTitle === twitterTitle) {
                return;
            }

            // If the title entered is different, set it as the new twitter title
            post.set('twitterTitle', twitterTitle);

            // Make sure the twitter title is valid and if so, save it into the post
            return post.validate({property: 'twitterTitle'}).then(() => {
                if (post.get('isNew')) {
                    return;
                }

                return this.savePostTask.perform();
            });
        },

        setTwitterDescription(twitterDescription) {
            // Grab the post and current stored twitter description
            let post = this.post;
            let currentDescription = post.get('twitterDescription');

            // If the description entered matches the stored twitter description, do nothing
            if (currentDescription === twitterDescription) {
                return;
            }

            // If the description entered is different, set it as the new twitter description
            post.set('twitterDescription', twitterDescription);

            // Make sure the twitter description is valid and if so, save it into the post
            return post.validate({property: 'twitterDescription'}).then(() => {
                if (post.get('isNew')) {
                    return;
                }

                return this.savePostTask.perform();
            });
        },

        setCoverImage(image) {
            this.set('post.featureImage', image);

            if (this.get('post.isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                this.post.rollbackAttributes();
            });
        },

        clearCoverImage() {
            this.set('post.featureImage', '');

            if (this.get('post.isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                this.post.rollbackAttributes();
            });
        },

        setOgImage(image) {
            this.set('post.ogImage', image);

            if (this.get('post.isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                this.post.rollbackAttributes();
            });
        },

        clearOgImage() {
            this.set('post.ogImage', '');

            if (this.get('post.isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                this.post.rollbackAttributes();
            });
        },

        setTwitterImage(image) {
            this.set('post.twitterImage', image);

            if (this.get('post.isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                this.post.rollbackAttributes();
            });
        },

        clearTwitterImage() {
            this.set('post.twitterImage', '');

            if (this.get('post.isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                this.post.rollbackAttributes();
            });
        },

        changeAuthors(newAuthors) {
            let post = this.post;

            // return if nothing changed
            if (newAuthors.mapBy('id').join() === post.get('authors').mapBy('id').join()) {
                return;
            }

            post.set('authors', newAuthors);
            post.validate({property: 'authors'});

            // if this is a new post (never been saved before), don't try to save it
            if (post.get('isNew')) {
                return;
            }

            this.savePostTask.perform().catch((error) => {
                this.showError(error);
                post.rollbackAttributes();
            });
        },

        deletePost() {
            if (this.deletePost) {
                this.deletePost();
            }
        }
    },

    showError(error) {
        // TODO: remove null check once ValidationEngine has been removed
        if (error) {
            this.notifications.showAPIError(error);
        }
    },

    setSidebarWidthFromElement: action(function (element) {
        const width = element.getBoundingClientRect().width;
        this.setSidebarWidthVariable(width);
    }),

    setSidebarWidthVariable(width) {
        document.documentElement.style.setProperty('--editor-sidebar-width', `${width}px`);
    }
});