import { filterPrivateRows, PrivacyMode } from "../privacy.mjs";
import { Database } from "./Database.mjs";
import { Logger } from "../Logger.mjs";
import { rowSchema } from "./model.mjs";
import { validateValue } from "../buckets.mjs";

const { hasProperty, mergeObject, randomID } = foundry.utils;

const dataFlag = `rows`;

export class UserFlagDatabase extends Database {
	// MARK: Row Ops
	static async createRow(tableID, userID, row, { rerender = true } = {}) {
		const table = await this.getTable(tableID);
		let user = game.users.get(userID);
		if (!table || !user) { return };

		row._id = randomID();
		row.timestamp = new Date().toISOString();

		const { error, value: corrected } = rowSchema.validate(
			row,
			{ abortEarly: false, convert: true, dateFormat: `iso`, render: false },
		);
		if (error) {
			ui.notifications.error(`Row being created did not conform to required schema, see console for more information.`, { console: false });
			Logger.error(error);
			return false;
		};

		const userData = user.getFlag(__ID__, dataFlag) ?? {};
		userData[tableID] ??= [];
		userData[tableID].push(corrected);
		await user.setFlag(__ID__, dataFlag, userData);

		if (rerender) {
			this.render({ userUpdated: userID });
		};
		this.triggerListeners();
	};

	static async createRows(tableID, userID, rows, { rerender = true } = {}) {
		const table = await this.getTable(tableID);
		let user = game.users.get(userID);
		if (!table || !user) { return };

		const userData = user.getFlag(__ID__, dataFlag) ?? {};
		userData[tableID] ??= [];

		let valueErrorPosted = false;
		let validationErrorPosted = false;

		for (const row of rows) {
			row._id = randomID();
			row.timestamp = new Date().toISOString();

			const { error, value: corrected } = rowSchema.validate(
				row,
				{ abortEarly: false, convert: true, dateFormat: `iso`, render: false },
			);
			if (error) {
				if (!validationErrorPosted) {
					ui.notifications.error(
						`One or more rows being created did not conform to required schema, skipping row and see console for more information.`,
						{ console: false },
					);
					validationErrorPosted = true;
				};
				Logger.error(`Failing row:`, row);
				Logger.error(error);
				continue;
			};

			const validValue = validateValue(corrected.value, table.buckets);
			if (!validValue) {
				if (!valueErrorPosted) {
					ui.notifications.warn(
						`One or more rows being created did not contain a valid value, skipping row and see console for more information.`,
						{ console: false },
					);
					valueErrorPosted = true;
				};
				Logger.warn(`Row with invalid value:`, row);
				continue;
			};

			userData[tableID].push(corrected);
		};

		await user.setFlag(__ID__, dataFlag, userData);

		if (rerender) {
			this.render({ userUpdated: userID });
		};
		this.triggerListeners();
	};

	static async getRows(tableID, userIDs, privacy = [PrivacyMode.PUBLIC]) {
		const table = await this.getTable(tableID);
		if (!table) { return };
		if (!userIDs || userIDs.length === 0) { userIDs = [game.user.id] };

		const datasets = {};
		for (const userID of userIDs) {
			const user = game.users.get(userID);
			if (!user) {
				Logger.warn(`Failed to find user with ID "${userID}", skipping.`);
				continue;
			};

			const userData = user.getFlag(__ID__, dataFlag) ?? {};
			datasets[userID] = filterPrivateRows(
				userData[tableID] ?? [],
				userID,
				privacy,
			);
		};

		return datasets;
	};

	static async updateRow(tableID, userID, rowID, changes) {
		const table = await this.getTable(tableID);
		if (!table) {
			Logger.error(`Cannot find the table with ID "${tableID}"`);
			return false;
		};

		const user = game.users.get(userID);
		if (!user) {
			Logger.error(`Can't find the user with ID "${tableID}"`);
			return false;
		};

		const userData = user.getFlag(__ID__, dataFlag) ?? {};
		let row = userData[tableID]?.find(row => row._id === rowID);
		if (!row) { return false };

		if (hasProperty(changes, `value`)) {
			const validValue = validateValue(changes.value, table.buckets);
			if (!validValue) {
				ui.notifications.warn(
					`One or more rows being created did not contain a valid value, skipping row and see console for more information.`,
					{ console: false },
				);
				Logger.warn(`Row with invalid value:`, row);
				return false;
			};
		};

		mergeObject(row, changes);
		await user.setFlag(__ID__, dataFlag, userData);
		this.render({ userUpdated: userID });
		this.triggerListeners();
		return true;
	};

	static async deleteRow(tableID, userID, rowID) {
		const table = await this.getTable(tableID);
		if (!table) {
			Logger.error(`Cannot find the table with ID "${tableID}"`);
			return;
		};

		const user = game.users.get(userID);
		if (!user) {
			Logger.error(`Can't find the user with ID "${tableID}"`);
			return;
		};

		const userData = user.getFlag(__ID__, dataFlag) ?? {};
		let rowIndex = userData[tableID]?.findIndex(row => row._id === rowID);
		if (rowIndex === -1) { return };
		userData[tableID].splice(rowIndex, 1);
		await user.setFlag(__ID__, dataFlag, userData);
		this.render({ userUpdated: userID });
		this.triggerListeners();
	};

	// MARK: Listeners
	static #listener = null;
	static async registerListeners() {
		if (this.#listener !== null) { return };

		this.#listener = Hooks.on(`updateUser`, (doc, diff, options, userID) => {
			// Shortcircuit when on the client that triggered the update
			if (userID === game.user.id) { return };
			if (!hasProperty(diff, `flags.${__ID__}.${dataFlag}`)) { return };
			this.render({ userUpdated: doc.id });
		});
	};

	static async triggerListeners() {
		// No-op because the User document lifecycle takes care of it
	};

	static async unregisterListeners() {
		Hooks.off(`updateUser`, this.#listener);
		this.#listener = null;
	};
};