// @flow

import React from "react";
import type { Branch } from "@scm-manager/ui-types";
import injectSheet from "react-jss";
import classNames from "classnames";
import DropDown from "./forms/DropDown";

const styles = {
  zeroflex: {
    flexBasis: "inherit",
    flexGrow: 0
  },
  minWidthOfControl: {
    minWidth: "10rem"
  },
  labelSizing: {
    fontSize: "1rem !important"
  },
  noBottomMargin: {
    marginBottom: "0 !important"
  }
};

type Props = {
  branches: Branch[], // TODO: Use generics?
  selected: (branch?: Branch) => void,
  selectedBranch?: string,
  label: string,
  disabled?: boolean,

  // context props
  classes: Object
};

type State = { selectedBranch?: Branch };

class BranchSelector extends React.Component<Props, State> {
  constructor(props: Props) {
    super(props);
    this.state = {};
  }

  componentDidMount() {
    const { branches } = this.props;
    if (branches) {
      const selectedBranch = branches.find(
        branch => branch.name === this.props.selectedBranch
      );
      this.setState({ selectedBranch });
    }
  }

  render() {
    const { branches, classes, label, disabled } = this.props;

    if (branches) {
      return (
        <div
          className={classNames(
            "field",
            "is-horizontal"
          )}
        >
          <div
            className={classNames("field-label", "is-normal", classes.zeroflex)}
          >
            <label className={classNames("label", classes.labelSizing)}>
              {label}
            </label>
          </div>
          <div className="field-body">
            <div
              className={classNames(
                "field",
                "is-narrow",
                classes.noBottomMargin
              )}
            >
              <div className={classNames("control", classes.minWidthOfControl)}>
                <DropDown
                  className="is-fullwidth"
                  options={branches.map(b => b.name)}
                  optionSelected={this.branchSelected}
                  disabled={!!disabled}
                  preselectedOption={
                    this.state.selectedBranch
                      ? this.state.selectedBranch.name
                      : ""
                  }
                />
              </div>
            </div>
          </div>
        </div>
      );
    } else {
      return null;
    }
  }

  branchSelected = (branchName: string) => {
    const { branches, selected } = this.props;

    if (!branchName) {
      this.setState({ selectedBranch: undefined });
      selected(undefined);
      return;
    }
    const branch = branches.find(b => b.name === branchName);

    selected(branch);
    this.setState({ selectedBranch: branch });
  };
}

export default injectSheet(styles)(BranchSelector);