import { ChannelVoucherData } from "@saleor/channels/utils";
import CardSpacer from "@saleor/components/CardSpacer";
import ChannelsAvailabilityCard from "@saleor/components/ChannelsAvailabilityCard";
import { ConfirmButtonTransitionState } from "@saleor/components/ConfirmButton";
import Container from "@saleor/components/Container";
import Form from "@saleor/components/Form";
import Grid from "@saleor/components/Grid";
import Metadata, { MetadataFormData } from "@saleor/components/Metadata";
import PageHeader from "@saleor/components/PageHeader";
import Savebar from "@saleor/components/Savebar";
import {
  createChannelsChangeHandler,
  createDiscountTypeChangeHandler
} from "@saleor/discounts/handlers";
import { DiscountErrorFragment } from "@saleor/fragments/types/DiscountErrorFragment";
import { sectionNames } from "@saleor/intl";
import { Backlink } from "@saleor/macaw-ui";
import { validatePrice } from "@saleor/products/utils/validation";
import useMetadataChangeTrigger from "@saleor/utils/metadata/useMetadataChangeTrigger";
import React from "react";
import { useIntl } from "react-intl";

import { PermissionEnum, VoucherTypeEnum } from "../../../types/globalTypes";
import { DiscountTypeEnum, RequirementsPicker } from "../../types";
import VoucherDates from "../VoucherDates";
import VoucherInfo from "../VoucherInfo";
import VoucherLimits from "../VoucherLimits";
import VoucherRequirements from "../VoucherRequirements";
import VoucherTypes from "../VoucherTypes";
import VoucherValue from "../VoucherValue";

export interface FormData extends MetadataFormData {
  applyOncePerCustomer: boolean;
  applyOncePerOrder: boolean;
  onlyForStaff: boolean;
  channelListings: ChannelVoucherData[];
  code: string;
  discountType: DiscountTypeEnum;
  endDate: string;
  endTime: string;
  hasEndDate: boolean;
  hasUsageLimit: boolean;
  minCheckoutItemsQuantity: string;
  requirementsPicker: RequirementsPicker;
  startDate: string;
  startTime: string;
  type: VoucherTypeEnum;
  usageLimit: string;
  value: number;
}

export interface VoucherCreatePageProps {
  allChannelsCount: number;
  channelListings: ChannelVoucherData[];
  hasChannelChanged: boolean;
  disabled: boolean;
  errors: DiscountErrorFragment[];
  saveButtonBarState: ConfirmButtonTransitionState;
  onBack: () => void;
  onChannelsChange: (data: ChannelVoucherData[]) => void;
  openChannelsModal: () => void;
  onSubmit: (data: FormData) => void;
}

const VoucherCreatePage: React.FC<VoucherCreatePageProps> = ({
  allChannelsCount,
  channelListings = [],
  disabled,
  errors,
  saveButtonBarState,
  onBack,
  onChannelsChange,
  onSubmit,
  hasChannelChanged,
  openChannelsModal
}) => {
  const intl = useIntl();
  const {
    makeChangeHandler: makeMetadataChangeHandler
  } = useMetadataChangeTrigger();

  const initialForm: FormData = {
    applyOncePerCustomer: false,
    applyOncePerOrder: false,
    onlyForStaff: false,
    channelListings,
    code: "",
    discountType: DiscountTypeEnum.VALUE_FIXED,
    endDate: "",
    endTime: "",
    hasEndDate: false,
    hasUsageLimit: false,
    minCheckoutItemsQuantity: "0",
    requirementsPicker: RequirementsPicker.NONE,
    startDate: "",
    startTime: "",
    type: VoucherTypeEnum.ENTIRE_ORDER,
    usageLimit: "0",
    value: 0,
    metadata: [],
    privateMetadata: []
  };

  return (
    <Form initial={initialForm} onSubmit={onSubmit}>
      {({ change, data, hasChanged, submit, triggerChange }) => {
        const handleDiscountTypeChange = createDiscountTypeChangeHandler(
          change
        );
        const handleChannelChange = createChannelsChangeHandler(
          data.channelListings,
          onChannelsChange,
          triggerChange
        );
        const formDisabled =
          data.discountType.toString() !== "SHIPPING" &&
          data.channelListings?.some(
            channel =>
              validatePrice(channel.discountValue) ||
              (data.requirementsPicker === RequirementsPicker.ORDER &&
                validatePrice(channel.minSpent))
          );
        const changeMetadata = makeMetadataChangeHandler(change);

        return (
          <Container>
            <Backlink onClick={onBack}>
              {intl.formatMessage(sectionNames.vouchers)}
            </Backlink>
            <PageHeader
              title={intl.formatMessage({
                defaultMessage: "Create Voucher",
                description: "page header"
              })}
            />
            <Grid>
              <div>
                <VoucherInfo
                  data={data}
                  errors={errors}
                  disabled={disabled}
                  onChange={event => handleDiscountTypeChange(data, event)}
                  variant="create"
                />
                <CardSpacer />
                <VoucherTypes
                  data={data}
                  disabled={disabled}
                  errors={errors}
                  onChange={change}
                />
                {data.discountType.toString() !== "SHIPPING" ? (
                  <>
                    <CardSpacer />
                    <VoucherValue
                      data={data}
                      disabled={disabled}
                      errors={errors}
                      onChannelChange={handleChannelChange}
                      onChange={change}
                      variant="create"
                    />
                  </>
                ) : null}
                <CardSpacer />
                <VoucherRequirements
                  data={data}
                  disabled={disabled}
                  errors={errors}
                  onChannelChange={handleChannelChange}
                  onChange={change}
                />
                <CardSpacer />
                <VoucherLimits
                  data={data}
                  disabled={disabled}
                  errors={errors}
                  onChange={change}
                />
                <CardSpacer />
                <VoucherDates
                  data={data}
                  disabled={disabled}
                  errors={errors}
                  onChange={change}
                />
              </div>
              <div>
                <ChannelsAvailabilityCard
                  managePermissions={[PermissionEnum.MANAGE_DISCOUNTS]}
                  selectedChannelsCount={data.channelListings.length}
                  allChannelsCount={allChannelsCount}
                  channelsList={data.channelListings.map(channel => ({
                    id: channel.id,
                    name: channel.name
                  }))}
                  disabled={disabled}
                  openModal={openChannelsModal}
                />
              </div>
              <Metadata data={data} onChange={changeMetadata} />
            </Grid>
            <Savebar
              disabled={
                disabled || formDisabled || (!hasChanged && !hasChannelChanged)
              }
              onCancel={onBack}
              onSubmit={submit}
              state={saveButtonBarState}
            />
          </Container>
        );
      }}
    </Form>
  );
};
VoucherCreatePage.displayName = "VoucherCreatePage";
export default VoucherCreatePage;