import { __ID__, filePath } from "../consts.mjs";
import { getFile, lastModifiedAt } from "../utils/fs.mjs";
import { paginate } from "../utils/pagination.mjs";
import { ImageApp } from "./ImageApp.mjs";

const { HandlebarsApplicationMixin, ApplicationV2 } = foundry.applications.api;
const { FormDataExtended } = foundry.applications.ux;
const { deepClone } = foundry.utils;

const PAGE_SIZE = 52;

export class ArtBrowser extends HandlebarsApplicationMixin(ApplicationV2) {
	// #region Options
	static DEFAULT_OPTIONS = {
		classes: [
			__ID__,
			`ArtBrowser`,
		],
		position: {},
		window: {},
		actions: {
			nextPage: this.#nextPage,
			prevPage: this.#prevPage,
			uploadImage: this.#uploadImage,
		},
	};

	static PARTS = {
		sidebar: {
			template: filePath(`templates/ArtBrowser/sidebar.hbs`),
		},
		images: {
			template: filePath(`templates/ArtBrowser/images.hbs`),
			templates: [
				filePath(`templates/ArtBrowser/image/grid.hbs`),
			],
		},
	};
	// #endregion Options

	// #region Instance Data
	#page = 1;
	filters = {
		name: ``,
		tags: [],
		artists: [],
	};

	async setPage(page) {
		if (this.#page == page) { return };
		this.#page = page;
		if (this.rendered) {
			return this.render({ parts: [`images`] });
		};
		return;
	};
	// #endregion Instance Data

	// #region Lifecycle
	#imagesDB = {
		lastModified: null,
		data: undefined,
	};
	async #getImages() {
		const newLastModified = await lastModifiedAt(`storage/db/images.json`);
		if (this.#imagesDB.lastModified && newLastModified === this.#imagesDB.lastModified) {
			return;
		};
		this.#imagesDB.lastModified = newLastModified;
		this.#imagesDB.data = await getFile(`storage/db/images.json`);
	};

	#artistDB = {
		lastModified: null,
		data: undefined,
	};
	async #getArtists() {
		const newLastModified = await lastModifiedAt(`storage/db/artists.json`);
		if (this.#artistDB.lastModified && newLastModified === this.#artistDB.lastModified) {
			return;
		};
		this.#artistDB.lastModified = newLastModified;
		this.#artistDB.data = await getFile(`storage/db/artists.json`);
	};

	async render(...args) {
		await this.#getArtists();
		await this.#getImages();
		return super.render(...args);
	};

	#imageUploadHook;
	#imageUpdateHook;
	async _onFirstRender(...args) {
		this.#imageUploadHook = Hooks.on(
			`${__ID__}.imageUploaded`,
			() => this.render({ parts: [`images`] }),
		);
		this.#imageUpdateHook = Hooks.on(
			`${__ID__}.imageUpdated`,
			() => this.render({ parts: [`images`] }),
		);
		return super._onFirstRender(...args);
	};

	async _onRender(ctx, options) {
		if (options.parts?.includes(`sidebar`)) {
			this.element.querySelector(`form.filters`)?.addEventListener(
				`change`,
				this.#onFilterSubmit.bind(this),
			);
		};
	};

	_tearDown(...args) {
		super._tearDown(...args);
		Hooks.off(`${__ID__}.imageUploaded`, this.#imageUploadHook);
		Hooks.off(`${__ID__}.imageUpdated`, this.#imageUpdateHook);
	};
	// #endregion Lifecycle

	// #region Data Prep
	_prepareContext() {
		return {
			meta: {
				idp: this.id,
			},
			selectMode: `view`,
		};
	};

	_preparePartContext(partID, ctx) {
		switch (partID) {
			case `sidebar`: {
				this._prepareSidebarContext(ctx);
				break;
			};
			case `images`: {
				this._prepareImagesContext(ctx);
				break;
			};
		};

		return ctx;
	};

	_prepareSidebarContext(ctx) {
		// TODO: grab all existing tags for dataset
		ctx.name = this.filters.name;
		ctx.tags = this.filters.tags;
		ctx.artists = this.filters.artists;

		ctx.artistList = [];
		for (const [id, artist] of Object.entries(this.#artistDB.data)) {
			ctx.artistList.push({ value: id, label: artist.name });
		};
	};

	_prepareImagesContext(ctx) {
		ctx.images = [];
		const allImages = Object.entries(deepClone(this.#imagesDB.data));

		const images = [];
		for (const [id, image] of allImages) {
			image.id = id;

			// Check if it matches the required filters
			if (this.filters.name && !image.name.includes(this.filters.name)) {
				continue;
			};

			const hasArtistFilter = this.filters.artists.length > 0;
			const hasAnArtist = this.filters.artists.some(artist => image.artists.includes(artist));
			const hasAllTags = this.filters.tags.every(tag => image.tags.includes(tag));
			if ((!hasAnArtist && hasArtistFilter) || !hasAllTags) { continue };

			// Convert all of the artist IDs into the actual data
			image.artists = image.artists
				.map(artistID => {
					if (artistID in this.#artistDB.data) {
						const artist = this.#artistDB.data[artistID];
						artist.id = artistID;
						return artist;
					};
					return { name: artistID, id: artistID };
				});

			images.push(image);
		};

		// Paginate after filtering and sorting to give page continuity
		images.sort((a, b) => a.name.localeCompare(b.name));
		const paginated = paginate(images, this.#page, PAGE_SIZE);
		ctx.images = paginated.page;
		ctx.page = this.#page;
		ctx.pages = paginated.total;
		ctx.has = {
			prev: paginated.prev,
			next: paginated.next
		};
	};
	// #endregion Data Prep

	// #region Actions
	async #onFilterSubmit(event) {
		event.preventDefault();
		event.stopPropagation();
		const data = (new FormDataExtended(event.currentTarget)).object;
		this.filters = data;
		this.render({ parts: [`images`] });
	};

	/** @this {ArtBrowser} */
	static async #nextPage() {
		this.#page += 1;
		this.render({ parts: [`images`] });
	};

	/** @this {ArtBrowser} */
	static async #prevPage() {
		this.#page -= 1;
		this.render({ parts: [`images`] });
	};

	/** @this {ArtBrowser} */
	static async #uploadImage() {
		const app = new ImageApp();
		app.render({ force: true });
	};
	// #endregion Actions
};