import React, { useState, useEffect, useRef } from "react";
import { Dropdown, Ref, Popup, Header } from "semantic-ui-react";

const LabelInput = ({
  defaultLabel,
  disabled,
  focusOnRender,
  initLabelIds,
  multilabels,
  possibleLabelsProp,
  relatedId,
  renderPopup,
  visible,
  open,
  onClose,
  onLabelConfirmed,
  onLabelUpdate,
}) => {
  const [label, setLabel] = useState([]);
  const [possibleLabels, setPossibleLabels] = useState([]);
  const [performInit, setPerformInit] = useState(true);
  const [confirmLabel, setConfirmLabel] = useState(0);

  const inputRef = useRef(null);

  useEffect(() => {
    updatePossibleLabels();
  }, []);

  useEffect(() => {
    if (initLabelIds) {
      setPerformInit(true);
    }
  }, [initLabelIds]);

  useEffect(() => {
    if (visible) {
      if (focusOnRender) {
        if (inputRef.current) {
          inputRef.current.click();
        }
      }
    }

    if (confirmLabel !== 0) {
      annoLabelUpdate(label);
      closeLabelInput();
    }

    if (initLabelIds) {
      if (performInit) {
        setPerformInit(false);

        if (initLabelIds.length > 0) {
          setLabel(initLabelIds);
        } else {
          setLabel([]);
        }
      }
    }
  }, [
    visible,
    focusOnRender,
    label,
    confirmLabel,
    possibleLabelsProp,
    initLabelIds,
    relatedId,
  ]);

  const onKeyDown = (e) => {
    e.stopPropagation();
    performKeyAction(e.key);
  };

  const onChange = (e, item) => {
    let lbl;

    if (multilabels) {
      lbl = item.value !== -1 ? item.value : [];
    } else {
      lbl = item.value !== -1 ? [item.value] : [];
    }

    setLabel(lbl);
    annoLabelUpdate(lbl);
  };

  const onItemClick = (e, item) => {
    incrementConfirmLabel();
  };

  const updatePossibleLabels = () => {
    let _possibleLabels = [];
    let _defaultLabel;

    if (defaultLabel) {
      if (Number.isInteger(defaultLabel)) {
        _defaultLabel = undefined;
      } else {
        _defaultLabel = defaultLabel;
      }
    } else {
      _defaultLabel = "no label";
    }

    if (possibleLabelsProp.length > 0) {
      _possibleLabels = possibleLabelsProp.map((e) => {
        return {
          key: e.id,
          value: e.id,
          text: e.label,
          content: (
            <div onClick={(event) => onItemClick(event, e.id)}>{e.label}</div>
          ),
        };
      });
    }

    if (_defaultLabel) {
      _possibleLabels.unshift({
        key: -1,
        value: -1,
        text: _defaultLabel,
        content: (
          <div onClick={(event) => onItemClick(event, -1)}>{_defaultLabel}</div>
        ),
      });
    }

    setPossibleLabels(_possibleLabels);
  };

  const performKeyAction = (key) => {
    switch (key) {
      case "Enter":
        if (!multilabels) {
          if (visible) incrementConfirmLabel();
        }
        break;
      case "Escape":
        closeLabelInput();
        break;
      default:
        break;
    }
  };

  const annoLabelUpdate = (label) => {
    // console.log("LabelInput -> annoLabelUpdate ", label);

    if (onLabelUpdate) {
      onLabelUpdate(label.filter((val) => val !== -1));
    }
  };

  const incrementConfirmLabel = () => {
    setConfirmLabel(confirmLabel + 1);
  };

  const closeLabelInput = () => {
    // console.log("LabelInput -> closeLabelInput");

    if (onLabelConfirmed) onLabelConfirmed(label.filter((val) => val !== -1));
    if (onClose) onClose();
  };

  const renderLabelInput = () => {
    let lbl;

    if (multilabels) lbl = label;
    else {
      lbl = label.length > 0 ? label[0] : -1;
    }

    return (
      <Ref innerRef={inputRef}>
        <Dropdown
          multiple={multilabels}
          search
          selection
          closeOnChange
          icon="search"
          options={possibleLabels}
          placeholder="Enter label"
          tabIndex={0}
          onKeyDown={(e) => onKeyDown(e)}
          value={lbl}
          onChange={(e, item) => onChange(e, item)}
          style={{ opacity: 0.8 }}
          disabled={disabled}
          open={open}
        />
      </Ref>
    );
  };

  const renderLabelInfo = () => {
    if (!label) return null;

    let lbl = undefined;

    if (label.length > 0) {
      lbl = possibleLabels.find((e) => label[label.length - 1] === e.id);
    }

    if (!lbl) return "No label";

    return (
      <div>
        <Header>{lbl.label}</Header>
        <div dangerouslySetInnerHTML={{ __html: lbl.description }} />
      </div>
    );
  };

  const renderPopupContent = () => {
    return <div>{renderLabelInfo()}</div>;
  };

  if (!visible) return null;

  if (renderPopup) {
    return (
      <Popup
        trigger={renderLabelInput()}
        content={renderPopupContent()}
        open
        position="right center"
        style={{ opacity: 0.9 }}
      />
    );
  } else {
    return renderLabelInput();
  }
};

export default LabelInput;