// Updating a variant will post ALL the variants in an array as an update to the API.

// todo : add DELETE option
import React, { useContext, useState } from 'react';
import { Typography, Table, Modal, Button } from 'antd';
import { ColumnsType } from 'antd/lib/table';
import { DeleteOutlined } from '@ant-design/icons';
import { ServerStatusContext } from '../../../utils/server-status-context';
import { UpdateArgs, VideoVariant } from '../../../types/config-section';
import VideoVariantForm from './video-variant-form';
import {
  API_VIDEO_VARIANTS,
  DEFAULT_VARIANT_STATE,
  SUCCESS_STATES,
  RESET_TIMEOUT,
  postConfigUpdateToAPI,
} from './constants';

const { Title } = Typography;

export default function CurrentVariantsTable() {
  const [displayModal, setDisplayModal] = useState(false);
  const [modalProcessing, setModalProcessing] = useState(false);
  const [editId, setEditId] = useState(0);

  // current data inside modal
  const [modalDataState, setModalDataState] = useState(DEFAULT_VARIANT_STATE);

  const [submitStatus, setSubmitStatus] = useState(null);
  const [submitStatusMessage, setSubmitStatusMessage] = useState('');

  const serverStatusData = useContext(ServerStatusContext);
  const { serverConfig, setFieldInConfigState } = serverStatusData || {};
  const { videoSettings } = serverConfig || {};
  const { videoQualityVariants } = videoSettings || {};

  let resetTimer = null;

  if (!videoSettings) {
    return null;
  }

  const resetStates = () => {
    setSubmitStatus(null);
    setSubmitStatusMessage('');
    resetTimer = null;
    clearTimeout(resetTimer);
  };

  const handleModalCancel = () => {
    setDisplayModal(false);
    setEditId(-1);
    setModalDataState(DEFAULT_VARIANT_STATE);
  };

  // posts all the variants at once as an array obj
  const postUpdateToAPI = async (postValue: any) => {
    await postConfigUpdateToAPI({
      apiPath: API_VIDEO_VARIANTS,
      data: { value: postValue },
      onSuccess: () => {
        setFieldInConfigState({
          fieldName: 'videoQualityVariants',
          value: postValue,
          path: 'videoSettings',
        });

        // close modal
        setModalProcessing(false);
        handleModalCancel();

        setSubmitStatus('success');
        setSubmitStatusMessage('Variants updated.');
        resetTimer = setTimeout(resetStates, RESET_TIMEOUT);
      },
      onError: (message: string) => {
        setSubmitStatus('error');
        setSubmitStatusMessage(message);
        resetTimer = setTimeout(resetStates, RESET_TIMEOUT);
      },
    });
  };

  // on Ok, send all of dataState to api
  // show loading
  // close modal when api is done
  const handleModalOk = () => {
    setModalProcessing(true);

    const postData = [...videoQualityVariants];
    if (editId === -1) {
      postData.push(modalDataState);
    } else {
      postData.splice(editId, 1, modalDataState);
    }
    postUpdateToAPI(postData);
  };

  const handleDeleteVariant = index => {
    const postData = [...videoQualityVariants];
    postData.splice(index, 1);
    postUpdateToAPI(postData);
  };

  const handleUpdateField = ({ fieldName, value }: UpdateArgs) => {
    setModalDataState({
      ...modalDataState,
      [fieldName]: value,
    });
  };

  const { icon: newStatusIcon = null, message: newStatusMessage = '' } =
    SUCCESS_STATES[submitStatus] || {};

  const cpuUsageLevelLabelMap = {
    1: 'lowest',
    2: 'low',
    3: 'medium',
    4: 'high',
    5: 'highest',
  };

  const videoQualityColumns: ColumnsType<VideoVariant> = [
    {
      title: '#',
      dataIndex: 'key',
      key: 'key',
    },
    {
      title: 'Video bitrate',
      dataIndex: 'videoBitrate',
      key: 'videoBitrate',
      render: (bitrate: number) => (!bitrate ? 'Same as source' : `${bitrate} kbps`),
    },

    {
      title: 'CPU Usage',
      dataIndex: 'cpuUsageLevel',
      key: 'cpuUsageLevel',
      render: (level: string) => (!level ? 'n/a' : cpuUsageLevelLabelMap[level]),
    },
    {
      title: '',
      dataIndex: '',
      key: 'edit',
      render: (data: VideoVariant) => {
        const index = data.key - 1;
        return (
          <span className="actions">
            <Button
              type="primary"
              size="small"
              onClick={() => {
                setEditId(index);
                setModalDataState(videoQualityVariants[index]);
                setDisplayModal(true);
              }}
            >
              Edit
            </Button>
            <Button
              className="delete-button"
              icon={<DeleteOutlined />}
              size="small"
              disabled={index === 0}
              onClick={() => {
                handleDeleteVariant(index);
              }}
            />
          </span>
        );
      },
    },
  ];

  const statusMessage = (
    <div className={`status-message ${submitStatus || ''}`}>
      {newStatusIcon} {newStatusMessage} {submitStatusMessage}
    </div>
  );

  const videoQualityVariantData = videoQualityVariants.map((variant, index) => ({
    key: index + 1,
    ...variant,
  }));

  return (
    <>
      <Title level={3}>Current Variants</Title>

      {statusMessage}

      <Table
        className="variants-table"
        pagination={false}
        size="small"
        columns={videoQualityColumns}
        dataSource={videoQualityVariantData}
      />

      <Modal
        title="Edit Video Variant Details"
        visible={displayModal}
        onOk={handleModalOk}
        onCancel={handleModalCancel}
        confirmLoading={modalProcessing}
      >
        <VideoVariantForm dataState={{ ...modalDataState }} onUpdateField={handleUpdateField} />

        {statusMessage}
      </Modal>
      <br />
      <Button
        type="primary"
        onClick={() => {
          setEditId(-1);
          setModalDataState(DEFAULT_VARIANT_STATE);
          setDisplayModal(true);
        }}
      >
        Add a new variant
      </Button>
    </>
  );
}