import { GetServerSidePropsContext } from "next";
import { Controller, useFieldArray, useForm } from "react-hook-form";
import { z } from "zod";

import { DateOverrideInputDialog, DateOverrideList } from "@calcom/features/schedules";
import Schedule from "@calcom/features/schedules/components/Schedule";
import { availabilityAsString } from "@calcom/lib/availability";
import { yyyymmdd } from "@calcom/lib/date-fns";
import { useLocale } from "@calcom/lib/hooks/useLocale";
import { stringOrNumber } from "@calcom/prisma/zod-utils";
import { trpc } from "@calcom/trpc/react";
import useMeQuery from "@calcom/trpc/react/hooks/useMeQuery";
import type { Schedule as ScheduleType, TimeRange, WorkingHours } from "@calcom/types/schedule";
import {
  Button,
  Form,
  Icon,
  Label,
  Shell,
  showToast,
  Skeleton,
  SkeletonText,
  Switch,
  TimezoneSelect,
  Tooltip,
  VerticalDivider,
} from "@calcom/ui";

import { HttpError } from "@lib/core/http/error";

import { SelectSkeletonLoader } from "@components/availability/SkeletonLoader";
import EditableHeading from "@components/ui/EditableHeading";

import { ssrInit } from "@server/lib/ssr";

const querySchema = z.object({
  schedule: stringOrNumber,
});

type AvailabilityFormValues = {
  name: string;
  schedule: ScheduleType;
  dateOverrides: { ranges: TimeRange[] }[];
  timeZone: string;
  isDefault: boolean;
};

const DateOverride = ({ workingHours }: { workingHours: WorkingHours[] }) => {
  const { remove, append, update, fields } = useFieldArray<AvailabilityFormValues, "dateOverrides">({
    name: "dateOverrides",
  });
  const { t } = useLocale();
  return (
    <div className="px-4 py-5 sm:p-6">
      <h3 className="font-medium leading-6 text-gray-900">
        {t("date_overrides")}{" "}
        <Tooltip content={t("date_overrides_info")}>
          <span className="inline-block">
            <Icon.FiInfo />
          </span>
        </Tooltip>
      </h3>
      <p className="mb-4 text-sm text-neutral-500 ltr:mr-4 rtl:ml-4">{t("date_overrides_subtitle")}</p>
      <div className="mt-1 space-y-2">
        <DateOverrideList
          excludedDates={fields.map((field) => yyyymmdd(field.ranges[0].start))}
          remove={remove}
          update={update}
          items={fields}
          workingHours={workingHours}
        />
        <DateOverrideInputDialog
          workingHours={workingHours}
          excludedDates={fields.map((field) => yyyymmdd(field.ranges[0].start))}
          onChange={(ranges) => append({ ranges })}
          Trigger={
            <Button color="secondary" StartIcon={Icon.FiPlus}>
              Add an override
            </Button>
          }
        />
      </div>
    </div>
  );
};

export default function Availability({ schedule }: { schedule: number }) {
  const { t, i18n } = useLocale();
  const utils = trpc.useContext();
  const me = useMeQuery();
  const { timeFormat } = me.data || { timeFormat: null };
  const { data, isLoading } = trpc.viewer.availability.schedule.get.useQuery({ scheduleId: schedule });
  const { data: defaultValues } = trpc.viewer.availability.defaultValues.useQuery({ scheduleId: schedule });
  const form = useForm<AvailabilityFormValues>({ defaultValues });
  const { control } = form;
  const updateMutation = trpc.viewer.availability.schedule.update.useMutation({
    onSuccess: async ({ prevDefaultId, currentDefaultId, ...data }) => {
      if (prevDefaultId && currentDefaultId) {
        // check weather the default schedule has been changed by comparing  previous default schedule id and current default schedule id.
        if (prevDefaultId !== currentDefaultId) {
          // if not equal, invalidate previous default schedule id and refetch previous default schedule id.
          utils.viewer.availability.schedule.get.invalidate({ scheduleId: prevDefaultId });
          utils.viewer.availability.schedule.get.refetch({ scheduleId: prevDefaultId });
        }
      }
      utils.viewer.availability.schedule.get.invalidate({ scheduleId: data.schedule.id });
      utils.viewer.availability.list.invalidate();
      showToast(
        t("availability_updated_successfully", {
          scheduleName: data.schedule.name,
        }),
        "success"
      );
    },
    onError: (err) => {
      if (err instanceof HttpError) {
        const message = `${err.statusCode}: ${err.message}`;
        showToast(message, "error");
      }
    },
  });

  return (
    <Shell
      backPath="/availability"
      title={data?.schedule.name ? data.schedule.name + " | " + t("availability") : t("availability")}
      heading={
        <Controller
          control={form.control}
          name="name"
          render={({ field }) => <EditableHeading isReady={!isLoading} {...field} />}
        />
      }
      subtitle={
        data ? (
          data.schedule.availability
            .filter((availability) => !!availability.days.length)
            .map((availability) => (
              <span key={availability.id}>
                {availabilityAsString(availability, { locale: i18n.language, hour12: timeFormat === 12 })}
                <br />
              </span>
            ))
        ) : (
          <SkeletonText className="h-4 w-48" />
        )
      }
      CTA={
        <div className="flex items-center justify-end">
          <div className="flex items-center rounded-md px-2 sm:hover:bg-gray-100">
            <Skeleton
              as={Label}
              htmlFor="hiddenSwitch"
              className="mt-2 hidden cursor-pointer self-center pr-2 sm:inline">
              {t("set_to_default")}
            </Skeleton>
            <Switch
              id="hiddenSwitch"
              disabled={isLoading || data?.isDefault}
              checked={form.watch("isDefault")}
              onCheckedChange={(e) => {
                form.setValue("isDefault", e);
              }}
            />
          </div>

          <VerticalDivider />

          <div className="border-l-2 border-gray-300" />
          <Button className="ml-4 lg:ml-0" type="submit" form="availability-form">
            {t("save")}
          </Button>
        </div>
      }>
      <div className="flex items-baseline sm:mt-0">
        {/* TODO: Find a better way to guarantee alignment, but for now this'll do. */}
        <Icon.FiArrowLeft className=" mr-3 text-transparent hover:cursor-pointer" />
        <div className="w-full">
          <Form
            form={form}
            id="availability-form"
            handleSubmit={async ({ dateOverrides, ...values }) => {
              updateMutation.mutate({
                scheduleId: schedule,
                dateOverrides: dateOverrides.flatMap((override) => override.ranges),
                ...values,
              });
            }}
            className="-mx-4 flex flex-col pb-16 sm:mx-0 xl:flex-row xl:space-x-6">
            <div className="flex-1 divide-y divide-neutral-200 rounded-md border">
              <div className=" py-5 pr-4 sm:p-6">
                <h3 className="mb-5 text-base font-medium leading-6 text-gray-900">
                  {t("change_start_end")}
                </h3>
                {typeof me.data?.weekStart === "string" && (
                  <Schedule
                    control={control}
                    name="schedule"
                    weekStart={
                      ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"].indexOf(
                        me.data?.weekStart
                      ) as 0 | 1 | 2 | 3 | 4 | 5 | 6
                    }
                  />
                )}
              </div>
              {data?.workingHours && <DateOverride workingHours={data.workingHours} />}
            </div>
            <div className="min-w-40 col-span-3 space-y-2 lg:col-span-1">
              <div className="xl:max-w-80 mt-4 w-full pr-4 sm:p-0">
                <div>
                  <label htmlFor="timeZone" className="block text-sm font-medium text-gray-700">
                    {t("timezone")}
                  </label>
                  <Controller
                    name="timeZone"
                    render={({ field: { onChange, value } }) =>
                      value ? (
                        <TimezoneSelect
                          value={value}
                          className="focus:border-brand mt-1 block w-72 rounded-md border-gray-300 text-sm"
                          onChange={(timezone) => onChange(timezone.value)}
                        />
                      ) : (
                        <SelectSkeletonLoader className="w-72" />
                      )
                    }
                  />
                </div>
                <hr className="my-8" />
                <div className="rounded-md">
                  <h3 className="text-sm font-medium text-gray-900">{t("something_doesnt_look_right")}</h3>
                  <div className="mt-3 flex">
                    <Button href="/availability/troubleshoot" color="secondary">
                      {t("launch_troubleshooter")}
                    </Button>
                  </div>
                </div>
              </div>
            </div>
          </Form>
        </div>
      </div>
    </Shell>
  );
}

export const getServerSideProps = async (ctx: GetServerSidePropsContext) => {
  const params = querySchema.safeParse(ctx.params);
  const ssr = await ssrInit(ctx);

  if (!params.success) return { notFound: true };

  const scheduleId = params.data.schedule;
  await ssr.viewer.availability.schedule.get.fetch({ scheduleId });
  await ssr.viewer.availability.defaultValues.fetch({ scheduleId });
  return {
    props: {
      schedule: scheduleId,
      trpcState: ssr.dehydrate(),
    },
  };
};