const Cheerio = require('cheerio');
const Crypto = require('crypto');
const imageSize = require('image-size');
const SteamID = require('steamid');

const SteamCommunity = require('../index.js');

const CEconItem = require('../classes/CEconItem.js');
const Helpers = require('./helpers.js');

SteamCommunity.prototype.addFriend = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestPost({
		uri: 'https://steamcommunity.com/actions/AddFriendAjax',
		form: {
			accept_invite: 0,
			sessionID: this.getSessionID(),
			steamid: userID.toString()
		},
		json: true
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		if (err) {
			return callback(err);
		}

		if (body.success) {
			callback(null);
		} else {
			callback(new Error('Unknown error'));
		}
	}, 'steamcommunity');
};

SteamCommunity.prototype.acceptFriendRequest = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestPost({
		uri: 'https://steamcommunity.com/actions/AddFriendAjax',
		form: {
			accept_invite: 1,
			sessionID: this.getSessionID(),
			steamid: userID.toString()
		}
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		callback(err || null);
	}, 'steamcommunity');
};

SteamCommunity.prototype.removeFriend = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestPost({
		uri: 'https://steamcommunity.com/actions/RemoveFriendAjax',
		form: {
			sessionID: this.getSessionID(),
			steamid: userID.toString()
		}
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		callback(err || null);
	}, 'steamcommunity');
};

SteamCommunity.prototype.blockCommunication = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestPost({
		uri: 'https://steamcommunity.com/actions/BlockUserAjax',
		form: {
			sessionID: this.getSessionID(),
			steamid: userID.toString()
		}
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		callback(err || null);
	}, 'steamcommunity');
};

SteamCommunity.prototype.unblockCommunication = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	let form = {action: 'unignore'};
	form['friends[' + userID.toString() + ']'] = 1;

	this._myProfile('friends/blocked/', form, (err, response, body) => {
		if (!callback) {
			return;
		}

		if (err || response.statusCode >= 400) {
			callback(err || new Error(`HTTP error ${response.statusCode}`));
			return;
		}

		callback(null);
	});
};

SteamCommunity.prototype.postUserComment = function(userID, message, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestPost({
		uri: `https://steamcommunity.com/comment/Profile/post/${userID.toString()}/-1`,
		form: {
			comment: message,
			count: 1,
			sessionid: this.getSessionID()
		},
		json: true
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		if (err) {
			callback(err);
			return;
		}

		if (body.success) {
			const $ = Cheerio.load(body.comments_html);
			const commentID = $('.commentthread_comment').attr('id').split('_')[1];

			callback(null, commentID);
		} else if (body.error) {
			callback(new Error(body.error));
		} else {
			callback(new Error('Unknown error'));
		}
	}, 'steamcommunity');
};

SteamCommunity.prototype.deleteUserComment = function(userID, commentID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestPost({
		uri: `https://steamcommunity.com/comment/Profile/delete/${userID.toString()}/-1`,
		form: {
			gidcomment: commentID,
			start: 0,
			count: 1,
			sessionid: this.getSessionID(),
			feature2: -1
		},
		json: true
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		if (err) {
			callback(err);
			return;
		}

		if (body.success && !body.comments_html.includes(commentID)) {
			callback(null);
		} else if (body.error) {
			callback(new Error(body.error));
		} else if (body.comments_html.includes(commentID)) {
			callback(new Error('Failed to delete comment'));
		} else {
			callback(new Error('Unknown error'));
		}
	}, 'steamcommunity');
};

SteamCommunity.prototype.getUserComments = function(userID, options, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	if (typeof options === 'function') {
		callback = options;
		options = {};
	}

	let form = Object.assign({
		start: 0,
		count: 0,
		feature2: -1,
		sessionid: this.getSessionID()
	}, options);

	this.httpRequestPost({
		uri: `https://steamcommunity.com/comment/Profile/render/${userID.toString()}/-1`,
		form,
		json: true
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		if (err) {
			callback(err);
			return;
		}

		if (body.success) {
			const $ = Cheerio.load(body.comments_html);
			const comments = $('.commentthread_comment.responsive_body_text[id]').map((i, elem) => {
				let $elem = $(elem),
					$commentContent = $elem.find('.commentthread_comment_text');
				return {
					id: $elem.attr('id').split('_')[1],
					author: {
						steamID: new SteamID('[U:1:' + $elem.find('[data-miniprofile]').data('miniprofile') + ']'),
						name: $elem.find('bdi').text(),
						avatar: $elem.find('.playerAvatar img[src]').attr('src'),
						state: $elem.find('.playerAvatar').attr('class').split(' ').pop()
					},
					date: new Date($elem.find('.commentthread_comment_timestamp').data('timestamp') * 1000),
					text: $commentContent.text().trim(),
					html: $commentContent.html().trim()
				};
			}).get();

			callback(null, comments, body.total_count);
		} else if (body.error) {
			callback(new Error(body.error));
		} else {
			callback(new Error('Unknown error'));
		}
	}, 'steamcommunity');
};

SteamCommunity.prototype.inviteUserToGroup = function(userID, groupID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestPost({
		uri: 'https://steamcommunity.com/actions/GroupInvite',
		form: {
			group: groupID.toString(),
			invitee: userID.toString(),
			json: 1,
			sessionID: this.getSessionID(),
			type: 'groupInvite'
		},
		json: true
	}, (err, response, body) => {
		if (!callback) {
			return;
		}

		if (err) {
			callback(err);
			return;
		}

		if (body.results == 'OK') {
			callback(null);
		} else if (body.results) {
			callback(new Error(body.results));
		} else {
			callback(new Error('Unknown error'));
		}
	}, 'steamcommunity');
};

SteamCommunity.prototype.getUserAliases = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequestGet({
		uri: `https://steamcommunity.com/profiles/${userID.getSteamID64()}/ajaxaliases`,
		json: true
	}, (err, response, body) => {
		if (err) {
			callback(err);
			return;
		}

		if (typeof body !== 'object') {
			callback(new Error('Malformed response'));
			return;
		}

		callback(null, body.map((entry) => {
			entry.timechanged = Helpers.decodeSteamTime(entry.timechanged);
			return entry;
		}));
	}, 'steamcommunity');
};

/**
 * Get the background URL of user's profile.
 * @param {SteamID|string} userID - The user's SteamID as a SteamID object or a string which can parse into one
 * @param {function} callback
 */
SteamCommunity.prototype.getUserProfileBackground = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	this.httpRequest(`https://steamcommunity.com/profiles/${userID.getSteamID64()}`, (err, response, body) => {
		if (err) {
			callback(err);
			return;
		}

		let $ = Cheerio.load(body);

		let $privateProfileInfo = $('.profile_private_info');
		if ($privateProfileInfo.length > 0) {
			callback(new Error($privateProfileInfo.text().trim()));
			return;
		}

		if ($('body').hasClass('has_profile_background')) {
			let backgroundUrl = $('div.profile_background_image_content').css('background-image');
			let matcher = backgroundUrl.match(/\(([^)]+)\)/);

			if (matcher.length != 2 || !matcher[1].length) {
				callback(new Error('Malformed response'));
			} else {
				callback(null, matcher[1]);
			}
		} else {
			callback(null, null);
		}
	}, 'steamcommunity');
};

SteamCommunity.prototype.getUserInventoryContexts = function(userID, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	if (typeof userID === 'function') {
		callback = userID;
		userID = this.steamID;
	}

	if (!userID) {
		callback(new Error('No SteamID specified and not logged in'));
		return;
	}

	this.httpRequest(`https://steamcommunity.com/profiles/${userID.getSteamID64()}/inventory/`, (err, response, body) => {
		if (err) {
			callback(err);
			return;
		}

		let match = body.match(/var g_rgAppContextData = ([^\n]+);\r?\n/);
		if (!match) {
			callback(new Error('Malformed response'));
			return;
		}

		let data;
		try {
			data = JSON.parse(match[1]);
		} catch (e) {
			callback(new Error('Malformed response'));
			return;
		}

		if (Object.keys(data).length == 0) {
			if (body.match(/inventory is currently private\./)) {
				callback(new Error('Private inventory'));
				return;
			}

			if (body.match(/profile_private_info/)) {
				callback(new Error('Private profile'));
				return;
			}

			// If they truly have no items in their inventory, Steam will send g_rgAppContextData as [] instead of {}.
			data = {};
		}

		callback(null, data);
	}, 'steamcommunity');
};

/**
 * Get the contents of a user's inventory context.
 * @deprecated Use getUserInventoryContents instead
 * @param {SteamID|string} userID - The user's SteamID as a SteamID object or a string which can parse into one
 * @param {int} appID - The Steam application ID of the game for which you want an inventory
 * @param {int} contextID - The ID of the "context" within the game you want to retrieve
 * @param {boolean} tradableOnly - true to get only tradable items and currencies
 * @param {function} callback
 */
SteamCommunity.prototype.getUserInventory = function(userID, appID, contextID, tradableOnly, callback) {
	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	const get = (inventory, currency, start) => {
		this.httpRequest({
			uri: `https://steamcommunity.com${endpoint}/inventory/json/${appID}/${contextID}`,
			headers: {
				Referer: `https://steamcommunity.com${endpoint}/inventory`
			},
			qs: {
				start: start,
				trading: tradableOnly ? 1 : undefined
			},
			json: true
		}, (err, response, body) => {
			if (err) {
				callback(err);
				return;
			}

			if (!body || !body.success || !body.rgInventory || !body.rgDescriptions || !body.rgCurrency) {
				if (body) {
					callback(new Error(body.Error || 'Malformed response'));
				} else {
					callback(new Error('Malformed response'));
				}

				return;
			}

			for (let i in body.rgInventory) {
				inventory.push(new CEconItem(body.rgInventory[i], body.rgDescriptions, contextID));
			}

			for (let i in body.rgCurrency) {
				currency.push(new CEconItem(body.rgCurrency[i], body.rgDescriptions, contextID));
			}

			if (body.more) {
				let match = response.request.uri.href.match(/\/(profiles|id)\/([^/]+)\//);
				if (match) {
					endpoint = `/${match[1]}/${match[2]}`;
				}

				get(inventory, currency, body.more_start);
			} else {
				callback(null, inventory, currency);
			}
		}, 'steamcommunity');
	};

	let endpoint = `/profiles/${userID.getSteamID64()}`;
	get([], []);
};

/**
 * Get the contents of a user's inventory context.
 * @param {SteamID|string} userID - The user's SteamID as a SteamID object or a string which can parse into one
 * @param {int} appID - The Steam application ID of the game for which you want an inventory
 * @param {int} contextID - The ID of the "context" within the game you want to retrieve
 * @param {boolean} tradableOnly - true to get only tradable items and currencies
 * @param {string} [language] - The language of item descriptions to return. Omit for default (which may either be English or your account's chosen language)
 * @param {function} callback
 */
SteamCommunity.prototype.getUserInventoryContents = function(userID, appID, contextID, tradableOnly, language, callback) {
	if (typeof language === 'function') {
		callback = language;
		language = 'english';
	}

	if (!userID) {
		callback(new Error('The user\'s SteamID is invalid or missing.'));
		return;
	}

	if (typeof userID === 'string') {
		userID = new SteamID(userID);
	}

	// A bit of optimization; objects are hash tables so it's more efficient to look up by key than to iterate an array
	let quickDescriptionLookup = {};

	const getDescription = (descriptions, classID, instanceID) => {
		let key = classID + '_' + (instanceID || '0'); // instanceID can be undefined, in which case it's 0.

		if (quickDescriptionLookup[key]) {
			return quickDescriptionLookup[key];
		}

		for (let i = 0; i < descriptions.length; i++) {
			quickDescriptionLookup[descriptions[i].classid + '_' + (descriptions[i].instanceid || '0')] = descriptions[i];
		}

		return quickDescriptionLookup[key];
	};

	const get = (inventory, currency, start) => {
		this.httpRequest({
			uri: `https://steamcommunity.com/inventory/${userID.getSteamID64()}/${appID}/${contextID}`,
			headers: {
				Referer: `https://steamcommunity.com/profiles/${userID.getSteamID64()}/inventory`
			},
			qs: {
				l: language, // Default language
				count: 2000, // Max items per 'page'
				start_assetid: start
			},
			json: true
		}, (err, response, body) => {
			if (err) {
				if (err.message == 'HTTP error 403' && body === null) {
					// 403 with a body of "null" means the inventory/profile is private.
					if (this.steamID && userID.getSteamID64() == this.steamID.getSteamID64()) {
						// We can never get private profile error for our own inventory!
						this._notifySessionExpired(err);
					}

					callback(new Error('This profile is private.'));
					return;
				}

				if (err.message == 'HTTP error 500' && body && body.error) {
					err = new Error(body.error);

					let match = body.error.match(/^(.+) \((\d+)\)$/);
					if (match) {
						err.message = match[1];
						err.eresult = match[2];
						callback(err);
						return;
					}
				}

				callback(err);
				return;
			}

			if (body && body.success && body.total_inventory_count === 0) {
				// Empty inventory
				callback(null, [], [], 0);
				return;
			}

			if (!body || !body.success || !body.assets || !body.descriptions) {
				if (body) {
					// Dunno if the error/Error property even exists on this new endpoint
					callback(new Error(body.error || body.Error || 'Malformed response'));
				} else {
					callback(new Error('Malformed response'));
				}

				return;
			}

			for (let i = 0; i < body.assets.length; i++) {
				let description = getDescription(body.descriptions, body.assets[i].classid, body.assets[i].instanceid);

				if (!tradableOnly || (description && description.tradable)) {
					body.assets[i].pos = pos++;
					(body.assets[i].currencyid ? currency : inventory).push(new CEconItem(body.assets[i], description, contextID));
				}
			}

			if (body.more_items) {
				get(inventory, currency, body.last_assetid);
			} else {
				callback(null, inventory, currency, body.total_inventory_count);
			}
		}, 'steamcommunity');
	};

	let pos = 1;
	get([], []);
};

/**
 * Upload an image to Steam and send it to another user over Steam chat.
 * @param {SteamID|string} userID - Either a SteamID object or a string that can parse into one
 * @param {Buffer} imageContentsBuffer - The image contents, as a Buffer
 * @param {{spoiler?: boolean}} [options]
 * @param {function} callback
 */
SteamCommunity.prototype.sendImageToUser = function(userID, imageContentsBuffer, options, callback) {
	if (typeof options == 'function') {
		callback = options;
		options = {};
	}

	options = options || {};

	if (!userID) {
		callback(new Error('The user\'s SteamID is invalid or missing'));
		return;
	}

	if (typeof userID == 'string') {
		userID = new SteamID(userID);
	}

	if (!Buffer.isBuffer(imageContentsBuffer)) {
		callback(new Error('The image contents must be a Buffer containing an image'));
		return;
	}

	let imageDetails = null;
	try {
		imageDetails = imageSize(imageContentsBuffer);
	} catch (ex) {
		callback(ex);
		return;
	}

	let imageHash = Crypto.createHash('sha1');
	imageHash.update(imageContentsBuffer);
	imageHash = imageHash.digest('hex');

	let filename = Date.now() + '_image.' + imageDetails.type;

	this.httpRequestPost({
		uri: 'https://steamcommunity.com/chat/beginfileupload/?l=english',
		headers: {
			referer: 'https://steamcommunity.com/chat/'
		},
		formData: { // it's multipart
			sessionid: this.getSessionID(),
			l: 'english',
			file_size: imageContentsBuffer.length,
			file_name: filename,
			file_sha: imageHash,
			file_image_width: imageDetails.width,
			file_image_height: imageDetails.height,
			file_type: 'image/' + (imageDetails.type == 'jpg' ? 'jpeg' : imageDetails.type)
		},
		json: true
	}, (err, res, body) => {
		if (err) {
			if (body && body.success) {
				let err2 = Helpers.eresultError(body.success);
				if (body.message) {
					err2.message = body.message;
				}
				callback(err2);
			} else {
				callback(err);
			}
			return;
		}

		if (body.success != 1) {
			callback(Helpers.eresultError(body.success));
			return;
		}

		let hmac = body.hmac;
		let timestamp = body.timestamp;
		let startResult = body.result;

		if (!startResult || !startResult.ugcid || !startResult.url_host || !startResult.request_headers) {
			callback(new Error('Malformed response'));
			return;
		}

		// Okay, now we need to PUT the file to the provided URL
		let uploadUrl = (startResult.use_https ? 'https' : 'http') + '://' + startResult.url_host + startResult.url_path;
		let headers = {};
		startResult.request_headers.forEach((header) => {
			headers[header.name.toLowerCase()] = header.value;
		});

		this.httpRequest({
			uri: uploadUrl,
			method: 'PUT',
			headers,
			body: imageContentsBuffer
		}, (err, res, body) => {
			if (err) {
				callback(err);
				return;
			}

			// Now we need to commit the upload
			this.httpRequestPost({
				uri: 'https://steamcommunity.com/chat/commitfileupload/',
				headers: {
					referer: 'https://steamcommunity.com/chat/'
				},
				formData: { // it's multipart again
					sessionid: this.getSessionID(),
					l: 'english',
					file_name: filename,
					file_sha: imageHash,
					success: '1',
					ugcid: startResult.ugcid,
					file_type: 'image/' + (imageDetails.type == 'jpg' ? 'jpeg' : imageDetails.type),
					file_image_width: imageDetails.width,
					file_image_height: imageDetails.height,
					timestamp,
					hmac,
					friend_steamid: userID.getSteamID64(),
					spoiler: options.spoiler ? '1' : '0'
				},
				json: true
			}, (err, res, body) => {
				if (err) {
					callback(err);
					return;
				}

				if (body.success != 1) {
					callback(Helpers.eresultError(body.success));
					return;
				}

				if (body.result.success != 1) {
					// lol valve
					callback(Helpers.eresultError(body.result.success));
					return;
				}

				if (!body.result.details || !body.result.details.url) {
					callback(new Error('Malformed response'));
					return;
				}

				callback(null, body.result.details.url);
			}, 'steamcommunity');
		}, 'steamcommunity');
	}, 'steamcommunity');
};