'use strict';
import sheep from '@/sheep';

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

function chooseImage(opts) {
  const {
    count,
    sizeType = ['original', 'compressed'],
    sourceType = ['album', 'camera'],
    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 = ['album', 'camera'], 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;
    })
    .then(async (files) => {
      for (let file of files.tempFiles) {
        let { path } = await sheep.$api.app.upload(file.path, 'ugc');
        file.url = path;
      }
      return files;
    });
}

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 };