import Component from '@glimmer/component';
import {action} from '@ember/object';
import {didCancel, task} from 'ember-concurrency';
import {inject as service} from '@ember/service';
import {tracked} from '@glimmer/tracking';

/**
 * @typedef {import('../../services/dashboard-stats').SourceAttributionCount} SourceAttributionCount
*/

const DISPLAY_OPTIONS = [{
    name: 'Free signups',
    value: 'signups'
}, {
    name: 'Paid conversions',
    value: 'paid'
}];

export default class Analytics extends Component {
    @service ajax;
    @service ghostPaths;
    @service settings;
    @service membersUtils;
    @service utils;
    @service feature;

    @tracked sources = null;
    @tracked links = null;
    @tracked sortColumn = 'signups';
    @tracked showSuccess;
    @tracked updateLinkId;
    displayOptions = DISPLAY_OPTIONS;

    get post() {
        return this.args.post;
    }

    get allowedDisplayOptions() {
        if (!this.hasPaidConversionData) {
            return this.displayOptions.filter(d => d.value === 'signups');
        }

        if (!this.hasFreeSignups) {
            return this.displayOptions.filter(d => d.value === 'paid');
        }

        return this.displayOptions;
    }

    get isDropdownDisabled() {
        if (!this.hasPaidConversionData || !this.hasFreeSignups) {
            return true;
        }

        return false;
    }

    get selectedDisplayOption() {
        if (!this.hasPaidConversionData) {
            return this.displayOptions.find(d => d.value === 'signups');
        }

        if (!this.hasFreeSignups) {
            return this.displayOptions.find(d => d.value === 'paid');
        }

        return this.displayOptions.find(d => d.value === this.sortColumn) ?? this.displayOptions[0];
    }

    get selectedSortColumn() {
        if (!this.hasPaidConversionData) {
            return 'signups';
        }

        if (!this.hasFreeSignups) {
            return 'paid';
        }
        return this.sortColumn;
    }

    get hasPaidConversionData() {
        return this.sources.some(sourceData => sourceData.paidConversions > 0);
    }

    get hasFreeSignups() {
        return this.sources.some(sourceData => sourceData.signups > 0);
    }

    @action
    onDisplayChange(selected) {
        this.sortColumn = selected.value;
    }

    @action
    setSortColumn(column) {
        this.sortColumn = column;
    }

    @action
    updateLink(linkId, linkTo) {
        if (this._updateLinks.isRunning) {
            return this._updateLinks.last;
        }
        return this._updateLinks.perform(linkId, linkTo);
    }

    @action
    loadData() {
        if (this.showSources) {
            this.fetchReferrersStats();
        } else {
            this.sources = [];
        }

        if (this.showLinks) {
            this.fetchLinks();
        } else {
            this.links = [];
        }
    }

    updateLinkData(linksData) {
        let updatedLinks;
        if (this.links?.length) {
            updatedLinks = this.links.map((link) => {
                let linkData = linksData.find(l => l.link.link_id === link.link.link_id);
                if (linkData) {
                    return {
                        ...linkData,
                        link: {
                            ...linkData.link,
                            originalTo: linkData.link.to,
                            to: this.utils.cleanTrackedUrl(linkData.link.to, false),
                            title: this.utils.cleanTrackedUrl(linkData.link.to, true)
                        }
                    };
                }
                return link;
            });
        } else {
            updatedLinks = linksData.map((link) => {
                return {
                    ...link,
                    link: {
                        ...link.link,
                        originalTo: link.link.to,
                        to: this.utils.cleanTrackedUrl(link.link.to, false),
                        title: this.utils.cleanTrackedUrl(link.link.to, true)
                    }
                };
            });
        }

        // Remove duplicates by title ad merge
        const linksByTitle = updatedLinks.reduce((acc, link) => {
            if (!acc[link.link.title]) {
                acc[link.link.title] = link;
            } else {
                acc[link.link.title].clicks += link.clicks;
            }
            return acc;
        }, {});

        this.links = Object.values(linksByTitle);
    }

    async fetchReferrersStats() {
        try {
            if (this._fetchReferrersStats.isRunning) {
                return this._fetchReferrersStats.last;
            }
            return this._fetchReferrersStats.perform();
        } catch (e) {
            if (!didCancel(e)) {
                // re-throw the non-cancelation error
                throw e;
            }
        }
    }

    async fetchLinks() {
        if (this._fetchLinks.isRunning) {
            return this._fetchLinks.last;
        }
        return this._fetchLinks.perform();
    }

    @task
    *_updateLinks(linkId, newLink) {
        this.updateLinkId = linkId;
        let currentLink;
        this.links = this.links?.map((link) => {
            if (link.link.link_id === linkId) {
                currentLink = new URL(link.link.originalTo);
                return {
                    ...link,
                    link: {
                        ...link.link,
                        to: this.utils.cleanTrackedUrl(newLink, false),
                        title: this.utils.cleanTrackedUrl(newLink, true)
                    }
                };
            }
            return link;
        });

        const filter = `post_id:${this.post.id}+to:'${currentLink}'`;
        let bulkUpdateUrl = this.ghostPaths.url.api(`links/bulk`) + `?filter=${encodeURIComponent(filter)}`;
        yield this.ajax.put(bulkUpdateUrl, {
            data: {
                bulk: {
                    action: 'updateLink',
                    meta: {link: {to: newLink}}
                }
            }
        });

        // Refresh links data
        const linksFilter = `post_id:${this.post.id}`;
        let statsUrl = this.ghostPaths.url.api(`links/`) + `?filter=${encodeURIComponent(linksFilter)}`;
        let result = yield this.ajax.request(statsUrl);
        this.updateLinkData(result.links);
        this.showSuccess = this.updateLinkId;
        setTimeout(() => {
            this.showSuccess = null;
        }, 2000);
    }

    @task
    *_fetchReferrersStats() {
        let statsUrl = this.ghostPaths.url.api(`stats/referrers/posts/${this.post.id}`);
        let result = yield this.ajax.request(statsUrl);
        this.sources = result.stats.map((stat) => {
            return {
                source: stat.source ?? 'Direct',
                signups: stat.signups,
                paidConversions: stat.paid_conversions
            };
        });
    }

    @task
    *_fetchLinks() {
        const filter = `post_id:${this.post.id}`;
        let statsUrl = this.ghostPaths.url.api(`links/`) + `?filter=${encodeURIComponent(filter)}`;
        let result = yield this.ajax.request(statsUrl);
        this.updateLinkData(result.links);
    }

    get showLinks() {
        return this.post.showEmailClickAnalytics;
    }

    get showSources() {
        return this.post.showAttributionAnalytics;
    }

    get isLoaded() {
        return this.links !== null && this.souces !== null;
    }
}