'use client';

import * as React from 'react';
import { useEffect, useMemo } from 'react';
import { useStore } from '@tanstack/react-form';
import { useMutation } from '@tanstack/react-query';
import { toast } from 'sonner';
import { Icons } from '@/components/icons';
import { Button } from '@/components/ui/button';
import {
  Sheet,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle
} from '@/components/ui/sheet';
import { useAppForm, useFormFields } from '@/components/ui/tanstack-form';
import { createCustomerMutation, updateCustomerMutation } from '../api/mutations';
import type { CustomerMutationPayload, CustomerRecord, CustomerReferenceData } from '../api/types';
import { customerSchema, type CustomerFormValues } from '../schemas/customer.schema';

interface CustomerFormSheetProps {
  customer?: CustomerRecord;
  open: boolean;
  onOpenChange: (open: boolean) => void;
  referenceData: CustomerReferenceData;
}

function toDefaultValues(
  customer: CustomerRecord | undefined,
  referenceData: CustomerReferenceData
): CustomerFormValues {
  return {
    name: customer?.name ?? '',
    abbr: customer?.abbr ?? '',
    taxId: customer?.taxId ?? '',
    customerType: customer?.customerType ?? referenceData.customerTypes[0]?.id ?? '',
    customerStatus: customer?.customerStatus ?? referenceData.customerStatuses[0]?.id ?? '',
    branchId: customer?.branchId ?? undefined,
    address: customer?.address ?? '',
    province: customer?.province ?? '',
    district: customer?.district ?? '',
    subDistrict: customer?.subDistrict ?? '',
    postalCode: customer?.postalCode ?? '',
    country: customer?.country ?? 'Thailand',
    phone: customer?.phone ?? '',
    fax: customer?.fax ?? '',
    email: customer?.email ?? '',
    website: customer?.website ?? '',
    leadChannel: customer?.leadChannel ?? undefined,
    customerGroup: customer?.customerGroup ?? undefined,
    customerSubGroup: customer?.customerSubGroup ?? undefined,
    notes: customer?.notes ?? '',
    isActive: customer?.isActive ?? true
  };
}

export function CustomerFormSheet({
  customer,
  open,
  onOpenChange,
  referenceData
}: CustomerFormSheetProps) {
  const isEdit = !!customer;
  const defaultValues = useMemo(
    () => toDefaultValues(customer, referenceData),
    [customer, referenceData]
  );
  const { FormTextField, FormSelectField, FormTextareaField, FormSwitchField } =
    useFormFields<CustomerFormValues>();

  const createMutation = useMutation({
    ...createCustomerMutation,
    onSuccess: () => {
      toast.success('สร้างลูกค้าสำเร็จ');
      onOpenChange(false);
    },
    onError: (error) =>
      toast.error(error instanceof Error ? error.message : 'ไม่สามารถสร้างลูกค้าได้')
  });

  const updateMutation = useMutation({
    ...updateCustomerMutation,
    onSuccess: () => {
      toast.success('อัปเดตลูกค้าสำเร็จ');
      onOpenChange(false);
    },
    onError: (error) =>
      toast.error(error instanceof Error ? error.message : 'ไม่สามารถอัปเดตลูกค้าได้')
  });

  const form = useAppForm({
    defaultValues,
    validators: {
      onSubmit: customerSchema
    },
    onSubmit: async ({ value }) => {
      const payload: CustomerMutationPayload = {
        ...value,
        branchId: value.branchId || null,
        leadChannel: value.leadChannel || null,
        customerGroup: value.customerGroup || null,
        customerSubGroup: value.customerSubGroup || null
      };

      if (isEdit && customer) {
        await updateMutation.mutateAsync({ id: customer.id, values: payload });
        return;
      }

      await createMutation.mutateAsync(payload);
    }
  });

  useEffect(() => {
    if (!open) {
      return;
    }

    form.reset(defaultValues);
  }, [defaultValues, form, open]);
  const selectedCustomerGroup = useStore(form.store, (state) => state.values.customerGroup);
  const selectedCustomerSubGroup = useStore(form.store, (state) => state.values.customerSubGroup);
  const filteredCustomerSubGroups = useMemo(
    () =>
      referenceData.customerSubGroups.filter((item) => item.parentId === selectedCustomerGroup),
    [referenceData.customerSubGroups, selectedCustomerGroup]
  );

  useEffect(() => {
    if (!selectedCustomerSubGroup) {
      return;
    }

    const isValid = filteredCustomerSubGroups.some((item) => item.id === selectedCustomerSubGroup);

    if (!isValid) {
      form.setFieldValue('customerSubGroup', '');
    }
  }, [filteredCustomerSubGroups, form, selectedCustomerSubGroup]);

  const isPending = createMutation.isPending || updateMutation.isPending;

  return (
    <Sheet open={open} onOpenChange={onOpenChange}>
      <SheetContent className='flex flex-col sm:max-w-3xl'>
        <SheetHeader>
          <SheetTitle>{isEdit ? 'แก้ไขลูกค้า' : 'เพิ่มลูกค้า'}</SheetTitle>
          <SheetDescription>จัดการข้อมูลหลักของลูกค้า สาขาที่ดูแล และการจัดประเภทใน CRM</SheetDescription>
        </SheetHeader>

        <div className='flex-1 overflow-auto'>
          <form.AppForm>
            <form.Form id='customer-form-sheet' className='grid gap-4 md:grid-cols-2'>
              <FormTextField
                name='name'
                label='ชื่อลูกค้า'
                required
                placeholder='ALLA Service Co., Ltd.'
              />
              <FormTextField name='abbr' label='ชื่อย่อ' placeholder='ALLA' />
              <FormTextField name='taxId' label='เลขประจำตัวผู้เสียภาษี' placeholder='0105556...' />
              <FormTextField name='phone' label='โทรศัพท์' placeholder='02-000-0000' />
              <FormTextField name='fax' label='แฟกซ์' placeholder='02-000-0001' />
              <FormTextField
                name='email'
                label='อีเมล'
                type='email'
                placeholder='sales@example.com'
              />
              <FormTextField name='website' label='เว็บไซต์' placeholder='https://example.com' />
              <FormTextField name='country' label='ประเทศ' placeholder='Thailand' />
              <FormSelectField
                name='customerType'
                label='ประเภทลูกค้า'
                required
                options={referenceData.customerTypes.map((item) => ({
                  value: item.id,
                  label: item.label
                }))}
              />
              <FormSelectField
                name='customerStatus'
                label='สถานะลูกค้า'
                required
                options={referenceData.customerStatuses.map((item) => ({
                  value: item.id,
                  label: item.label
                }))}
              />
              <FormSelectField
                name='branchId'
                label='สาขา'
                options={referenceData.branches.map((branch) => ({
                  value: branch.id,
                  label: branch.name
                }))}
              />
              <FormSelectField
                name='leadChannel'
                label='ที่มาของลีด'
                options={referenceData.leadChannels.map((item) => ({
                  value: item.id,
                  label: item.label
                }))}
              />
              <FormSelectField
                name='customerGroup'
                label='กลุ่มลูกค้า'
                options={referenceData.customerGroups.map((item) => ({
                  value: item.id,
                  label: item.label
                }))}
              />
              <FormSelectField
                name='customerSubGroup'
                label='กลุ่มย่อยลูกค้า'
                disabled={!selectedCustomerGroup}
                placeholder={
                  selectedCustomerGroup ? 'เลือกกลุ่มย่อยลูกค้า' : 'เลือกกลุ่มลูกค้าก่อน'
                }
                options={filteredCustomerSubGroups.map((item) => ({
                  value: item.id,
                  label: item.label
                }))}
              />
              <div className='md:col-span-2'>
                <FormTextField name='address' label='ที่อยู่' placeholder='123 Main Road' />
              </div>
              <FormTextField name='province' label='จังหวัด' placeholder='Bangkok' />
              <FormTextField name='district' label='เขต / อำเภอ' placeholder='Bang Kapi' />
              <FormTextField name='subDistrict' label='แขวง / ตำบล' placeholder='Hua Mak' />
              <FormTextField name='postalCode' label='รหัสไปรษณีย์' placeholder='10240' />
              <div className='md:col-span-2'>
                <FormTextareaField
                  name='notes'
                  size='md'
                  label='หมายเหตุ'
                  placeholder='หมายเหตุภายในเกี่ยวกับความสัมพันธ์กับลูกค้ารายนี้'
                />
              </div>
              <div className='md:col-span-2'>
                <FormSwitchField
                  name='isActive'
                  label='ใช้งานอยู่'
                  description='ลูกค้าที่ปิดใช้งานยังคงอยู่ในประวัติ แต่ไม่ควรนำไปใช้กับงานใหม่'
                />
              </div>
            </form.Form>
          </form.AppForm>
        </div>

        <SheetFooter>
          <Button type='button' variant='outline' onClick={() => onOpenChange(false)}>
            ยกเลิก
          </Button>
          <Button type='submit' form='customer-form-sheet' isLoading={isPending}>
            <Icons.check className='mr-2 h-4 w-4' />
            {isEdit ? 'อัปเดตลูกค้า' : 'สร้างลูกค้า'}
          </Button>
        </SheetFooter>
      </SheetContent>
    </Sheet>
  );
}

export function CustomerFormSheetTrigger({
  referenceData
}: {
  referenceData: CustomerReferenceData;
}) {
  const [open, setOpen] = React.useState(false);

  return (
    <>
      <Button onClick={() => setOpen(true)}>
        <Icons.add className='mr-2 h-4 w-4' /> เพิ่มลูกค้า
      </Button>
      <CustomerFormSheet open={open} onOpenChange={setOpen} referenceData={referenceData} />
    </>
  );
}