import { Notice, Plugin, requestUrl } from "obsidian";
import {
	type BookTrackerPluginSettings,
	BookTrackerSettingTab,
	DEFAULT_SETTINGS,
} from "./settings/settings";
import { getBookByLegacyId, type SearchResult } from "@data-sources/goodreads";
import { Templater } from "./utils/templater";
import { GoodreadsSearchModal } from "@views/goodreads-search-modal";
import { GoodreadsSearchSuggestModal } from "@views/goodreads-search-suggest-modal";
import {
	CONTENT_TYPE_EXTENSIONS,
	IN_PROGRESS_STATE,
	READ_STATE,
	TO_BE_READ_STATE,
} from "./const";
import { ReadingLog, Storage } from "@utils/storage";
import { ReadingProgressModal } from "@views/reading-progress-modal";
import { RatingModal } from "@views/rating-modal";
import { renderCodeBlockProcessor } from "@utils/svelte";
import ReadingLogViewer from "@components/ReadingLogViewer.svelte";

export default class BookTrackerPlugin extends Plugin {
	settings: BookTrackerPluginSettings;
	templater: Templater;
	storage: Storage;
	readingLog: ReadingLog;

	async onload() {
		await this.loadSettings();

		this.templater = new Templater(this.app);
		this.storage = new Storage(this.app, this);
		this.readingLog = new ReadingLog(this.app, this);

		this.addCommand({
			id: "search-goodreads",
			name: "Search Goodreads",
			callback: () => this.searchGoodreads(),
		});

		this.addCommand({
			id: "log-reading-started",
			name: "Log Reading Started",
			callback: () => this.logReadingStarted(),
		});

		this.addCommand({
			id: "log-reading-progress",
			name: "Log Reading Progress",
			callback: () => this.logReadingProgress(),
		});

		this.addCommand({
			id: "log-reading-completed",
			name: "Log Reading Completed",
			callback: () => this.logReadingFinished(),
		});

		this.addCommand({
			id: "reset-reading-status",
			name: "Reset Reading Status",
			callback: () => this.resetReadingStatus(),
		});

		this.addSettingTab(new BookTrackerSettingTab(this.app, this));

		this.registerMarkdownCodeBlockProcessor(
			"readinglog",
			renderCodeBlockProcessor(ReadingLogViewer, {
				app: this.app,
				readingLog: this.readingLog,
			})
		);
	}

	onunload() {}

	async loadSettings() {
		this.settings = Object.assign(
			{},
			DEFAULT_SETTINGS,
			await this.loadData()
		);
	}

	async saveSettings() {
		await this.saveData(this.settings);
	}

	async downloadCoverImage(
		coverImageUrl: string,
		fileName: string
	): Promise<string> {
		const response = await requestUrl(coverImageUrl);
		const contentType = response.headers["content-type"];
		const extension = CONTENT_TYPE_EXTENSIONS[contentType || ""] || "";
		if (extension === "") {
			throw new Error("Unsupported content type: " + contentType);
		}

		let filePath = this.settings.coverDirectory + "/";
		if (this.settings.groupCoversByFirstLetter) {
			let groupName = fileName.charAt(0).toUpperCase();
			if (!/^[A-Z]$/.test(groupName)) {
				groupName = "#";
			}

			filePath += groupName + "/";
		}
		filePath += fileName + "." + extension;

		const existingFile = this.app.vault.getFileByPath(filePath);
		if (existingFile) {
			if (this.settings.overwriteExistingCovers) {
				await this.app.vault.modifyBinary(
					existingFile,
					response.arrayBuffer
				);
			} else {
				new Notice("Cover image already exists: " + filePath);
				return filePath;
			}
		}

		await this.app.vault.createBinary(filePath, response.arrayBuffer);

		return filePath;
	}

	async createEntryFromGoodreads(legacyId: number): Promise<void> {
		try {
			const book = await getBookByLegacyId(legacyId);

			const fileName = this.templater
				.renderTemplate(this.settings.fileNameFormat, {
					title: book.title,
					authors: book.authors.map((a) => a.name).join(", "),
				})
				.replace(/[/\:*?<>|""]/g, "");

			const data: Record<string, unknown> = { book };

			if (this.settings.downloadCovers && book.coverImageUrl) {
				data.coverImagePath = await this.downloadCoverImage(
					book.coverImageUrl,
					fileName
				);
			}

			const renderedContent = await this.templater.renderTemplateFile(
				this.settings.templateFile,
				data
			);

			if (renderedContent) {
				await this.app.vault.create(
					this.settings.tbrDirectory + "/" + fileName + ".md",
					renderedContent
				);
			}
		} catch (error) {
			console.error("Failed to create book entry:", error);
		}
	}

	async searchGoodreads(): Promise<void> {
		let results: SearchResult[];
		try {
			results = await GoodreadsSearchModal.createAndOpen(this.app);
		} catch (error) {
			console.error("Failed to search Goodreads:", error);
			new Notice(
				"Failed to search Goodreads. Check console for details."
			);
			return;
		}
		const selectedBook = await GoodreadsSearchSuggestModal.createAndOpen(
			this.app,
			results
		);

		if (selectedBook) {
			await this.createEntryFromGoodreads(selectedBook.legacyId);
		} else {
			new Notice("No book selected.");
		}
	}

	logReadingStarted(): void {
		const activeFile = this.app.workspace.getActiveFile();
		if (!activeFile) {
			new Notice("No active file to mark as currently reading.");
			return;
		}

		if (activeFile.extension !== "md") {
			new Notice("Active file is not a markdown file.");
			return;
		}

		if (!this.settings.statusProperty) {
			new Notice("Status property is not set in settings.");
			return;
		}

		if (!this.settings.startDateProperty) {
			new Notice("Start date property is not set in settings.");
			return;
		}

		// @ts-expect-error Moment is provided by Obsidian
		const startDate = moment().format("YYYY-MM-DD");

		this.app.fileManager.processFrontMatter(activeFile, (frontMatter) => {
			frontMatter[this.settings.statusProperty] = IN_PROGRESS_STATE;
			frontMatter[this.settings.startDateProperty] = startDate;
		});

		new Notice("Reading started for " + activeFile.name);
	}

	async logReadingProgress() {
		const activeFile = this.app.workspace.getActiveFile();
		if (!activeFile) {
			new Notice("No active file to log reading progress.");
			return;
		}

		if (activeFile.extension !== "md") {
			new Notice("Active file is not a markdown file.");
			return;
		}

		const fileName = activeFile.basename;
		if (!this.settings.pageLengthProperty) {
			new Notice("Page length property is not set in settings.");
			return;
		}

		const pageLength =
			(this.app.metadataCache.getFileCache(activeFile)?.frontmatter?.[
				this.settings.pageLengthProperty
			] as number | undefined) ?? 0;

		if (pageLength <= 0) {
			new Notice(
				"Page length property is not set or is invalid in the active file."
			);
			return;
		}

		const pageNumber = await ReadingProgressModal.createAndOpen(
			this.app,
			pageLength
		);

		if (pageNumber <= 0 || pageNumber > pageLength) {
			new Notice(
				`Invalid page number: ${pageNumber}. It must be between 1 and ${pageLength}.`
			);
			return;
		}

		await this.readingLog.addEntry(fileName, pageNumber, pageLength);
		new Notice(
			`Logged reading progress for ${fileName}: Page ${pageNumber} of ${pageLength}.`
		);
	}

	async logReadingFinished() {
		const activeFile = this.app.workspace.getActiveFile();
		if (!activeFile) {
			new Notice("No active file to mark as finished reading.");
			return;
		}

		if (activeFile.extension !== "md") {
			new Notice("Active file is not a markdown file.");
			return;
		}

		if (!this.settings.statusProperty) {
			new Notice("Status property is not set in settings.");
			return;
		}

		if (!this.settings.endDateProperty) {
			new Notice("End date property is not set in settings.");
			return;
		}

		if (!this.settings.ratingProperty) {
			new Notice("Rating property is not set in settings.");
			return;
		}

		const pageLength =
			(this.app.metadataCache.getFileCache(activeFile)?.frontmatter?.[
				this.settings.pageLengthProperty
			] as number | undefined) ?? 0;

		if (pageLength <= 0) {
			new Notice(
				"Page length property is not set or is invalid in the active file."
			);
			return;
		}

		const rating = await RatingModal.createAndOpen(this.app);

		await this.readingLog.addEntry(
			activeFile.basename,
			pageLength,
			pageLength
		);

		// @ts-expect-error Moment is provided by Obsidian
		const endDate = moment().format("YYYY-MM-DD");

		this.app.fileManager.processFrontMatter(activeFile, (frontMatter) => {
			frontMatter[this.settings.statusProperty] = READ_STATE;
			frontMatter[this.settings.endDateProperty] = endDate;
			frontMatter[this.settings.ratingProperty] = rating;
		});

		new Notice("Reading finished for " + activeFile.name);
	}

	resetReadingStatus(): any {
		const activeFile = this.app.workspace.getActiveFile();
		if (!activeFile) {
			new Notice("No active file to reset reading status.");
			return;
		}

		if (activeFile.extension !== "md") {
			new Notice("Active file is not a markdown file.");
			return;
		}

		if (!this.settings.statusProperty) {
			new Notice("Status property is not set in settings.");
			return;
		}

		if (!this.settings.startDateProperty) {
			new Notice("Start date property is not set in settings.");
			return;
		}

		if (!this.settings.endDateProperty) {
			new Notice("End date property is not set in settings.");
			return;
		}

		this.app.fileManager.processFrontMatter(activeFile, (frontMatter) => {
			frontMatter[this.settings.statusProperty] = TO_BE_READ_STATE;
			frontMatter[this.settings.startDateProperty] = "";
			frontMatter[this.settings.endDateProperty] = "";
		});

		new Notice("Reading status reset for " + activeFile.name);
	}
}