'use strict';

const ERR_MSG_OK = 'chooseAndUploadFile:ok';
const ERR_MSG_FAIL = 'chooseAndUploadFile:fail';

function chooseImage(opts) {
	const {
		count,
		sizeType = ['original', 'compressed'],
		sourceType,
		extension
	} = opts
	return new Promise((resolve, reject) => {
		uni.chooseImage({
			count,
			sizeType,
			sourceType,
			extension,
			success(res) {
				resolve(normalizeChooseAndUploadFileRes(res, 'image'));
			},
			fail(res) {
				reject({
					errMsg: res.errMsg.replace('chooseImage:fail', ERR_MSG_FAIL),
				});
			},
		});
	});
}

function chooseVideo(opts) {
	const {
		camera,
		compressed,
		maxDuration,
		sourceType,
		extension
	} = opts;
	return new Promise((resolve, reject) => {
		uni.chooseVideo({
			camera,
			compressed,
			maxDuration,
			sourceType,
			extension,
			success(res) {
				const {
					tempFilePath,
					duration,
					size,
					height,
					width
				} = res;
				resolve(normalizeChooseAndUploadFileRes({
					errMsg: 'chooseVideo:ok',
					tempFilePaths: [tempFilePath],
					tempFiles: [
					{
						name: (res.tempFile && res.tempFile.name) || '',
						path: tempFilePath,
						size,
						type: (res.tempFile && res.tempFile.type) || '',
						width,
						height,
						duration,
						fileType: 'video',
						cloudPath: '',
					}, ],
				}, 'video'));
			},
			fail(res) {
				reject({
					errMsg: res.errMsg.replace('chooseVideo:fail', ERR_MSG_FAIL),
				});
			},
		});
	});
}

function chooseAll(opts) {
	const {
		count,
		extension
	} = opts;
	return new Promise((resolve, reject) => {
		let chooseFile = uni.chooseFile;
		if (typeof wx !== 'undefined' &&
			typeof wx.chooseMessageFile === 'function') {
			chooseFile = wx.chooseMessageFile;
		}
		if (typeof chooseFile !== 'function') {
			return reject({
				errMsg: ERR_MSG_FAIL + ' 请指定 type 类型，该平台仅支持选择 image 或 video。',
			});
		}
		chooseFile({
			type: 'all',
			count,
			extension,
			success(res) {
				resolve(normalizeChooseAndUploadFileRes(res));
			},
			fail(res) {
				reject({
					errMsg: res.errMsg.replace('chooseFile:fail', ERR_MSG_FAIL),
				});
			},
		});
	});
}

function normalizeChooseAndUploadFileRes(res, fileType) {
	res.tempFiles.forEach((item, index) => {
		if (!item.name) {
			item.name = item.path.substring(item.path.lastIndexOf('/') + 1);
		}
		if (fileType) {
			item.fileType = fileType;
		}
		item.cloudPath =
			Date.now() + '_' + index + item.name.substring(item.name.lastIndexOf('.'));
	});
	if (!res.tempFilePaths) {
		res.tempFilePaths = res.tempFiles.map((file) => file.path);
	}
	return res;
}

function uploadCloudFiles(files, max = 5, onUploadProgress) {
	files = JSON.parse(JSON.stringify(files))
	const len = files.length
	let count = 0
	let self = this
	return new Promise(resolve => {
		while (count < max) {
			next()
		}

		function next() {
			let cur = count++
			if (cur >= len) {
				!files.find(item => !item.url && !item.errMsg) && resolve(files)
				return
			}
			const fileItem = files[cur]
			const index = self.files.findIndex(v => v.uuid === fileItem.uuid)
			fileItem.url = ''
			delete fileItem.errMsg

			uniCloud
				.uploadFile({
					filePath: fileItem.path,
					cloudPath: fileItem.cloudPath,
					fileType: fileItem.fileType,
					onUploadProgress: res => {
						res.index = index
						onUploadProgress && onUploadProgress(res)
					}
				})
				.then(res => {
					fileItem.url = res.fileID
					fileItem.index = index
					if (cur < len) {
						next()
					}
				})
				.catch(res => {
					fileItem.errMsg = res.errMsg || res.message
					fileItem.index = index
					if (cur < len) {
						next()
					}
				})
		}
	})
}





function uploadFiles(choosePromise, {
	onChooseFile,
	onUploadProgress
}) {
	return choosePromise
		.then((res) => {
			if (onChooseFile) {
				const customChooseRes = onChooseFile(res);
				if (typeof customChooseRes !== 'undefined') {
					return Promise.resolve(customChooseRes).then((chooseRes) => typeof chooseRes === 'undefined' ?
						res : chooseRes);
				}
			}
			return res;
		})
		.then((res) => {
			if (res === false) {
				return {
					errMsg: ERR_MSG_OK,
					tempFilePaths: [],
					tempFiles: [],
				};
			}
			return res
		})
}

function chooseAndUploadFile(opts = {
	type: 'all'
}) {
	if (opts.type === 'image') {
		return uploadFiles(chooseImage(opts), opts);
	}
	else if (opts.type === 'video') {
		return uploadFiles(chooseVideo(opts), opts);
	}
	return uploadFiles(chooseAll(opts), opts);
}

export {
	chooseAndUploadFile,
	uploadCloudFiles
};
