import React, {
  useMemo,
} from "react";

export const FormItem = React.memo((props) => {
  const {
    title,
    value = "",
    readonly = true,
    horizontal = true,
    type,
    ...otherProps
  } = props;

  const valueMemo = useMemo(() => {
    if (readonly) {
      if (["", undefined, null].includes(value)) return "-";
      return value;
    }
    if (type === "number") {
      return <FormItemNumber value={value + ""} {...otherProps} />;
    }
    return value;
  }, [readonly, value, type, otherProps]);

  return (
    <div className={"form-item " + (horizontal ? "horizontal" : "vertical")}>
      <div className="label">{title}</div>
      <div className="value">{valueMemo}</div>
      <style jsx>{`
        .form-item {
          line-height: 36px;
          margin-bottom: 32px;
          white-space: nowrap;
          overflow: hidden;
          text-overflow: ellipsis;
        }
        .form-item.horizontal {
          height: 36px;
        }
        .form-item.horizontal .label,
        .form-item.horizontal .value {
          display: inline;
          vertical-align: middle;
        }
        .form-item.horizontal .label {
          margin-right: 16px;
        }
        .form-item.vertical {
          height: 88px;
        }
        .form-item.vertical .label,
        .form-item.vertical .value {
          white-space: nowrap;
          overflow: hidden;
          text-overflow: ellipsis;
        }
        .form-item.vertical .label {
          margin-bottom: 8px;
        }
        .form-item .label {
          font-size: 20px;
          color: rgb(0 0 0 / 45%);
        }
        .form-item .value {
          font-size: 24px;
          color: rgb(0 0 0 / 85%);
          font-weight: bold;
        }
      `}</style>
    </div>
  );
});

const FormItemNumber = React.memo((props) => {
  const { value, onChange = () => {}, min } = props;
  const onInputChange = (e) => {
    onChange(e.target.value);
  };
  const onInputBlur = (e) => {
    let res = parseFloat(e.target.value);
    if (isNaN(res)) res = "-";
    onChange(res + "");
  };
  const onBtnClick = (add) => {
    let res = parseFloat(value);
    if (isNaN(res)) res = add;
    res = res + add;
    if (min !== undefined && res < min) res = min;
    onChange(res + "");
  };
  const btnDisabled = useMemo(() => [value <= min], [value, min]);
  return (
    <div className="input-number">
      <div
        className={"btn" + (btnDisabled[0] ? " disabled" : "")}
        onClick={() => value > min && onBtnClick(-1)}
      >
        -
      </div>
      <input
        className="input-number-input"
        type="text"
        value={value}
        onChange={onInputChange}
        onBlur={onInputBlur}
      />
      <div className="btn" onClick={() => onBtnClick(1)}>
        +
      </div>
      <style jsx>{`
        .btn,
        .input-number-input {
          height: 36px;
          line-height: 30px;
          display: inline-block;
          vertical-align: middle;
          text-align: center;
          background: #f5f5f5;
        }
        .input-number-input {
          outline: none;
          border: 1px solid transparent;
          box-shadow: none;
          font-size: 24px;
          padding: 0 12px;
          width: 120px;
          margin: 0 3px;
        }
        .input-number-input:focus {
          border-color: #0285ff;
        }
        .btn {
          width: 36px;
          font-size: 32px;
          color: #999;
          cursor: pointer;
          user-select: none;
        }
        .btn.disabled {
          color: #ccc;
          cursor: not-allowed;
        }
      `}</style>
    </div>
  );
});