import { useEffect } from "react";
import { Controller, useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { useNavigate, useParams } from "react-router";
import {
  Alert,
  Box,
  Button,
  CircularProgress,
  FormControl,
  InputLabel,
  MenuItem,
  Paper,
  Select,
  Stack,
  TextField,
  Typography,
} from "@mui/material";
import { accountSchema, type AccountFormValues } from "@/domain/accounts/schemas/account-schema";
import { useAccountDetail } from "@/domain/accounts/use-cases/use-account-detail";
import { useCreateAccount } from "@/domain/accounts/use-cases/use-create-account";
import { useUpdateAccount } from "@/domain/accounts/use-cases/use-update-account";

const defaultValues: AccountFormValues = {
  AccountName: "",
  AccountNumber: "",
  Industry: "",
  Website: "",
  Notes: "",
  Address1: "",
  Address2: "",
  City: "",
  State: "",
  Zip: "",
  Country: "US",
};

export default function AccountFormPage() {
  const { id } = useParams();
  const navigate = useNavigate();
  const isEdit = Boolean(id);

  const { data: account, isLoading, error } = useAccountDetail(id);
  const createAccount = useCreateAccount();
  const updateAccount = useUpdateAccount();

  const {
    register,
    handleSubmit,
    reset,
    control,
    formState: { errors },
  } = useForm<AccountFormValues>({
    resolver: zodResolver(accountSchema),
    defaultValues,
  });

  useEffect(() => {
    if (account && isEdit) {
      reset({
        AccountName: account.AccountName ?? "",
        AccountNumber: account.AccountNumber ?? "",
        Industry: account.Industry ?? "",
        Website: account.Website ?? "",
        Notes: account.Notes ?? "",
        Address1: account.Address1 ?? "",
        Address2: account.Address2 ?? "",
        City: account.City ?? "",
        State: account.State ?? "",
        Zip: account.Zip ?? "",
        Country: account.Country ?? "US",
      });
    }
  }, [account, isEdit, reset]);

  const isSaving = createAccount.isPending || updateAccount.isPending;

  const onSubmit = (values: AccountFormValues) => {
    if (isEdit && id) {
      updateAccount.mutate({ id, values });
      return;
    }
    createAccount.mutate(values);
  };

  if (isEdit && isLoading) {
    return (
      <Box className="flex justify-center p-10">
        <CircularProgress />
      </Box>
    );
  }

  return (
    <Box className="mx-auto max-w-4xl p-4">
      <Paper variant="outlined" className="p-6">
        <Stack spacing={4}>
          <Stack
            direction="row"
            sx={{
              justifyContent: "space-between",
              alignItems: "center",
            }}
          >
            <Typography variant="h5" component="h1">
              {isEdit ? "Edit Account" : "Create an Account"}
            </Typography>
            <Button variant="text" onClick={() => navigate("/accounts")}>
              Back to list
            </Button>
          </Stack>

          {Boolean(error) && (
            <Alert severity="error">
              {error instanceof Error ? error.message : "Failed to load account"}
            </Alert>
          )}

          <Box component="form" onSubmit={handleSubmit(onSubmit)} className="flex flex-col gap-6">
            <Stack spacing={2}>
              <Typography variant="subtitle1" className="font-semibold">
                General Details
              </Typography>
              <Stack direction={{ xs: "column", md: "row" }} spacing={2}>
                <TextField
                  {...register("AccountName")}
                  label="Account Name"
                  required
                  error={Boolean(errors.AccountName)}
                  helperText={errors.AccountName?.message}
                  fullWidth
                />
                <TextField {...register("AccountNumber")} label="Account Number" fullWidth />
              </Stack>
              <Stack direction={{ xs: "column", md: "row" }} spacing={2}>
                <TextField {...register("Industry")} label="Industry" fullWidth />
                <TextField {...register("Website")} label="Website" fullWidth />
              </Stack>
              <TextField {...register("Notes")} label="Notes" fullWidth multiline minRows={2} />
            </Stack>

            <Stack spacing={2}>
              <Typography variant="subtitle1" className="font-semibold">
                Address
              </Typography>
              <Stack direction={{ xs: "column", md: "row" }} spacing={2}>
                <TextField {...register("Address1")} label="Address 1" fullWidth />
                <TextField {...register("Address2")} label="Address 2" fullWidth />
              </Stack>
              <Stack direction={{ xs: "column", md: "row" }} spacing={2}>
                <TextField {...register("City")} label="City" fullWidth />
                <TextField {...register("State")} label="State / Province" fullWidth />
                <TextField {...register("Zip")} label="Zip/Postal Code" fullWidth />
              </Stack>
              <Controller
                name="Country"
                control={control}
                render={({ field }) => (
                  <FormControl fullWidth>
                    <InputLabel id="country-label">Country</InputLabel>
                    <Select
                      {...field}
                      labelId="country-label"
                      label="Country"
                      value={field.value ?? "US"}
                    >
                      <MenuItem value="">Select Country</MenuItem>
                      <MenuItem value="US">United States</MenuItem>
                    </Select>
                  </FormControl>
                )}
              />
            </Stack>

            <Stack
              direction="row"
              spacing={2}
              sx={{
                justifyContent: "flex-end",
              }}
            >
              <Button variant="outlined" onClick={() => navigate("/accounts")} disabled={isSaving}>
                Cancel
              </Button>
              <Button type="submit" variant="contained" disabled={isSaving}>
                {isSaving ? "Saving..." : isEdit ? "Update Account" : "Create Account"}
              </Button>
            </Stack>
          </Box>
        </Stack>
      </Paper>
    </Box>
  );
}