"use client";

import { useState } from "react";
import { useForm } from "react-hook-form";
import { z } from "zod";
import { zodResolver } from "@hookform/resolvers/zod";
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { toast } from "sonner";
import { Plus } from "lucide-react";
import { beautyBusinessApi, type Appointment } from "@/modules/beauty/services/beauty-business-api";
import { useTenantId } from "@/hooks/useTenantId";
import {
  PageHeader,
  Button,
  Dialog,
  Input,
  DataTable,
  EmptyState,
  LoadingState,
  ErrorState,
  Badge,
  FormField,
  Select,
  JalaliDateText,
} from "@/components/ds";

const createSchema = z.object({
  organization_id: z.string().min(1, "سازمان الزامی است"),
  branch_id: z.string().min(1, "شعبه الزامی است"),
  code: z.string().min(1, "کد الزامی است"),
  scheduled_start: z.string().min(1, "شروع الزامی است"),
  scheduled_end: z.string().min(1, "پایان الزامی است"),
  customer_ref: z.string().optional(),
  notes: z.string().optional(),
});

export default function AppointmentsPage() {
  const { tenantId } = useTenantId();
  const qc = useQueryClient();
  const [createOpen, setCreateOpen] = useState(false);

  const orgsQ = useQuery({
    queryKey: ["beauty", tenantId, "organizations"],
    queryFn: () => beautyBusinessApi.organizations.list(tenantId!),
    enabled: !!tenantId,
  });

  const branchesQ = useQuery({
    queryKey: ["beauty", tenantId, "branches"],
    queryFn: () => beautyBusinessApi.branches.list(tenantId!),
    enabled: !!tenantId,
  });

  const listQ = useQuery({
    queryKey: ["beauty", tenantId, "appointments"],
    queryFn: () => beautyBusinessApi.appointments.list(tenantId!),
    enabled: !!tenantId,
  });

  const createForm = useForm<z.infer<typeof createSchema>>({
    resolver: zodResolver(createSchema),
    defaultValues: {
      organization_id: "",
      branch_id: "",
      code: "",
      scheduled_start: "",
      scheduled_end: "",
      customer_ref: "",
      notes: "",
    },
  });

  const selectedOrg = createForm.watch("organization_id");
  const filteredBranches = (branchesQ.data ?? []).filter(
    (b) => !selectedOrg || b.organization_id === selectedOrg
  );

  const invalidate = () =>
    qc.invalidateQueries({ queryKey: ["beauty", tenantId, "appointments"] });

  const createM = useMutation({
    mutationFn: (d: z.infer<typeof createSchema>) =>
      beautyBusinessApi.appointments.create(tenantId!, {
        ...d,
        scheduled_start: new Date(d.scheduled_start).toISOString(),
        scheduled_end: new Date(d.scheduled_end).toISOString(),
        customer_ref: d.customer_ref || undefined,
        notes: d.notes || undefined,
      }),
    onSuccess: async () => {
      toast.success("نوبت ایجاد شد");
      setCreateOpen(false);
      createForm.reset();
      await invalidate();
    },
    onError: (e: Error) => toast.error(e.message),
  });

  const confirmM = useMutation({
    mutationFn: (row: Appointment) =>
      beautyBusinessApi.appointments.confirm(tenantId!, row.id, { version: row.version }),
    onSuccess: async () => {
      toast.success("نوبت تأیید شد");
      await invalidate();
    },
    onError: (e: Error) => toast.error(e.message),
  });

  if (!tenantId || listQ.isLoading) return <LoadingState />;
  if (listQ.error) {
    return <ErrorState message={listQ.error.message} onRetry={() => listQ.refetch()} />;
  }

  return (
    <div>
      <PageHeader
        title="نوبت‌ها"
        description="مدیریت نوبت‌های سالن زیبایی."
        actions={
          <Button onClick={() => setCreateOpen(true)}>
            <Plus className="h-4 w-4" />
            نوبت جدید
          </Button>
        }
      />

      <DataTable
        columns={[
          { key: "code", header: "کد" },
          {
            key: "scheduled_start",
            header: "شروع",
            render: (r) => <JalaliDateText value={String(r.scheduled_start ?? "")} />,
          },
          {
            key: "status",
            header: "وضعیت",
            render: (r) => <Badge>{String(r.status)}</Badge>,
          },
          {
            key: "actions",
            header: "عملیات",
            render: (r) => {
              const row = r as unknown as Appointment;
              if (row.status !== "requested") return null;
              return (
                <Button
                  type="button"
                  size="sm"
                  variant="secondary"
                  disabled={confirmM.isPending}
                  onClick={() => confirmM.mutate(row)}
                >
                  تأیید
                </Button>
              );
            },
          },
        ]}
        rows={(listQ.data ?? []) as unknown as Record<string, unknown>[]}
        empty={<EmptyState action={<Button onClick={() => setCreateOpen(true)}>ایجاد نوبت</Button>} />}
      />

      <Dialog open={createOpen} onClose={() => setCreateOpen(false)} title="نوبت جدید">
        <form className="space-y-3" onSubmit={createForm.handleSubmit((d) => createM.mutate(d))}>
          <FormField label="سازمان" error={createForm.formState.errors.organization_id?.message}>
            <Select {...createForm.register("organization_id")}>
              <option value="">انتخاب کنید</option>
              {(orgsQ.data ?? []).map((o) => (
                <option key={o.id} value={o.id}>
                  {o.name}
                </option>
              ))}
            </Select>
          </FormField>
          <FormField label="شعبه" error={createForm.formState.errors.branch_id?.message}>
            <Select {...createForm.register("branch_id")}>
              <option value="">انتخاب کنید</option>
              {filteredBranches.map((b) => (
                <option key={b.id} value={b.id}>
                  {b.name}
                </option>
              ))}
            </Select>
          </FormField>
          <FormField label="کد" error={createForm.formState.errors.code?.message}>
            <Input {...createForm.register("code")} />
          </FormField>
          <FormField label="شروع (ISO)" error={createForm.formState.errors.scheduled_start?.message}>
            <Input type="datetime-local" {...createForm.register("scheduled_start")} />
          </FormField>
          <FormField label="پایان (ISO)" error={createForm.formState.errors.scheduled_end?.message}>
            <Input type="datetime-local" {...createForm.register("scheduled_end")} />
          </FormField>
          <FormField label="مرجع مشتری">
            <Input {...createForm.register("customer_ref")} />
          </FormField>
          <FormField label="یادداشت">
            <Input {...createForm.register("notes")} />
          </FormField>
          <div className="flex justify-end gap-2">
            <Button type="button" variant="outline" onClick={() => setCreateOpen(false)}>
              انصراف
            </Button>
            <Button type="submit" disabled={createM.isPending}>
              ذخیره
            </Button>
          </div>
        </form>
      </Dialog>
    </div>
  );
}