import styled from '@emotion/styled';
import { DropResult } from '@hello-pangea/dnd';
import { IconPlus } from 'twenty-ui';
import { v4 } from 'uuid';

import { LightButton } from '@/ui/input/button/components/LightButton';
import { CardContent } from '@/ui/layout/card/components/CardContent';
import { CardFooter } from '@/ui/layout/card/components/CardFooter';
import { DraggableItem } from '@/ui/layout/draggable-list/components/DraggableItem';
import { DraggableList } from '@/ui/layout/draggable-list/components/DraggableList';
import {
  MAIN_COLOR_NAMES,
  ThemeColor,
} from '@/ui/theme/constants/MainColorNames';
import { moveArrayItem } from '~/utils/array/moveArrayItem';

import { SettingsObjectFieldSelectFormOption } from '../types/SettingsObjectFieldSelectFormOption';

import { SettingsObjectFieldSelectFormOptionRow } from './SettingsObjectFieldSelectFormOptionRow';

export type SettingsObjectFieldSelectFormValues =
  SettingsObjectFieldSelectFormOption[];

type SettingsObjectFieldSelectFormProps = {
  onChange: (values: SettingsObjectFieldSelectFormValues) => void;
  values: SettingsObjectFieldSelectFormValues;
  isMultiSelect?: boolean;
};

const StyledContainer = styled(CardContent)`
  padding-bottom: ${({ theme }) => theme.spacing(3.5)};
`;

const StyledLabel = styled.span`
  color: ${({ theme }) => theme.font.color.light};
  display: block;
  font-size: ${({ theme }) => theme.font.size.xs};
  font-weight: ${({ theme }) => theme.font.weight.semiBold};
  margin-bottom: 6px;
  margin-top: ${({ theme }) => theme.spacing(1)};
`;

const StyledFooter = styled(CardFooter)`
  background-color: ${({ theme }) => theme.background.secondary};
  padding: ${({ theme }) => theme.spacing(1)};
`;

const StyledButton = styled(LightButton)`
  justify-content: center;
  width: 100%;
`;

const getNextColor = (currentColor: ThemeColor) => {
  const currentColorIndex = MAIN_COLOR_NAMES.findIndex(
    (color) => color === currentColor,
  );
  const nextColorIndex = (currentColorIndex + 1) % MAIN_COLOR_NAMES.length;
  return MAIN_COLOR_NAMES[nextColorIndex];
};

export const SettingsObjectFieldSelectForm = ({
  onChange,
  values,
  isMultiSelect = false,
}: SettingsObjectFieldSelectFormProps) => {
  const handleDragEnd = (result: DropResult) => {
    if (!result.destination) return;

    const nextOptions = moveArrayItem(values, {
      fromIndex: result.source.index,
      toIndex: result.destination.index,
    });

    onChange(nextOptions);
  };

  const handleDefaultValueChange = (
    index: number,
    option: SettingsObjectFieldSelectFormOption,
    nextOption: SettingsObjectFieldSelectFormOption,
    forceUniqueDefaultValue: boolean,
  ) => {
    const computeUniqueDefaultValue =
      forceUniqueDefaultValue && option.isDefault !== nextOption.isDefault;

    const nextOptions = computeUniqueDefaultValue
      ? values.map((value) => ({
          ...value,
          isDefault: false,
        }))
      : [...values];

    nextOptions.splice(index, 1, nextOption);
    onChange(nextOptions);
  };

  const findNewLabel = () => {
    let optionIndex = values.length + 1;
    while (optionIndex < 100) {
      const newLabel = `Option ${optionIndex}`;
      if (!values.map((value) => value.label).includes(newLabel)) {
        return newLabel;
      }
      optionIndex += 1;
    }
    return `Option 100`;
  };

  return (
    <>
      <StyledContainer>
        <StyledLabel>Options</StyledLabel>
        <DraggableList
          onDragEnd={handleDragEnd}
          draggableItems={
            <>
              {values.map((option, index) => (
                <DraggableItem
                  key={option.value}
                  draggableId={option.value}
                  index={index}
                  isDragDisabled={values.length === 1}
                  itemComponent={
                    <SettingsObjectFieldSelectFormOptionRow
                      key={option.value}
                      isDefault={option.isDefault}
                      onChange={(nextOption) => {
                        handleDefaultValueChange(
                          index,
                          option,
                          nextOption,
                          !isMultiSelect,
                        );
                      }}
                      onRemove={
                        values.length > 1
                          ? () => {
                              const nextOptions = [...values];
                              nextOptions.splice(index, 1);
                              onChange(nextOptions);
                            }
                          : undefined
                      }
                      option={option}
                    />
                  }
                />
              ))}
            </>
          }
        />
      </StyledContainer>
      <StyledFooter>
        <StyledButton
          title="Add option"
          Icon={IconPlus}
          onClick={() =>
            onChange([
              ...values,
              {
                color: getNextColor(values[values.length - 1].color),
                label: findNewLabel(),
                value: v4(),
              },
            ])
          }
        />
      </StyledFooter>
    </>
  );
};