import { useState } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { z } from "zod";
import { useParams, useLocation } from "wouter";
import { useLanguage } from "../contexts/LanguageContext";
import {
  useGetRequest, useSubmitThankYou,
  getListRequestsQueryKey, getGetRequestQueryKey,
} from "@workspace/api-client-react";
import { useQueryClient } from "@tanstack/react-query";
import { Form, FormControl, FormField, FormItem, FormLabel, FormMessage } from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { CheckCircle, Heart } from "lucide-react";
import { Skeleton } from "@/components/ui/skeleton";
import { Link } from "wouter";

const schema = z.object({
  beneficiaryName: z.string().min(2),
  message: z.string().min(10),
});

type FormData = z.infer<typeof schema>;

export default function ThankYou() {
  const { t } = useLanguage();
  const params = useParams<{ id: string }>();
  const [, setLocation] = useLocation();
  const queryClient = useQueryClient();
  const [submitted, setSubmitted] = useState(false);

  const { data: request, isLoading } = useGetRequest(params.id || "", {
    query: { enabled: !!params.id, queryKey: getGetRequestQueryKey(params.id || "") },
  });

  const submitThankYou = useSubmitThankYou();

  const form = useForm<FormData>({
    resolver: zodResolver(schema),
    defaultValues: {
      beneficiaryName: "",
      message: "",
    },
  });

  // Pre-fill name once loaded
  const beneficiaryName = request?.beneficiaryName || "";

  const onSubmit = (data: FormData) => {
    submitThankYou.mutate(
      {
        id: params.id || "",
        data: { beneficiaryName: data.beneficiaryName, message: data.message },
      },
      {
        onSuccess: () => {
          queryClient.invalidateQueries({ queryKey: getListRequestsQueryKey() });
          queryClient.invalidateQueries({ queryKey: getGetRequestQueryKey(params.id || "") });
          setSubmitted(true);
        },
      }
    );
  };

  if (isLoading) {
    return (
      <div className="container mx-auto px-4 py-12 max-w-xl space-y-4">
        <Skeleton className="h-10 w-48" />
        <Skeleton className="h-64 w-full" />
      </div>
    );
  }

  if (!request) {
    return (
      <div className="container mx-auto px-4 py-12 text-center text-muted-foreground">
        {t.common.notFound}
      </div>
    );
  }

  if (submitted) {
    return (
      <div className="container mx-auto px-4 py-12 max-w-xl">
        <Card className="border-2 border-green-200">
          <CardContent className="pt-10 pb-10 text-center">
            <div className="flex justify-center gap-2 mb-4">
              <Heart className="w-12 h-12 text-green-600 fill-green-100" />
              <CheckCircle className="w-12 h-12 text-green-500" />
            </div>
            <h2 className="text-2xl font-bold text-green-700 mb-2">{t.common.success}</h2>
            <p className="text-muted-foreground">{t.thankYou.title}</p>
            <p className="mt-4 text-sm text-muted-foreground">{t.thankYou.successNote}</p>
            <div className="mt-8 flex gap-3 justify-center">
              <Button onClick={() => setLocation(`/track/${params.id}`)}>
                {t.common.trackCase}
              </Button>
              <Button variant="outline" onClick={() => setLocation("/")}>
                {t.common.home}
              </Button>
            </div>
          </CardContent>
        </Card>
      </div>
    );
  }

  return (
    <div className="container mx-auto px-4 py-12 max-w-xl">
      <div className="mb-8">
        <h1 className="text-3xl font-bold text-foreground">{t.thankYou.title}</h1>
        <p className="text-muted-foreground mt-1">
          {request.caseId} — {request.beneficiaryName}
        </p>
      </div>

      <Card>
        <CardHeader>
          <CardTitle className="text-base text-primary">{t.thankYou.title}</CardTitle>
        </CardHeader>
        <CardContent>
          <Form {...form}>
            <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-5">
              <FormField
                control={form.control}
                name="beneficiaryName"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t.request.beneficiaryName}</FormLabel>
                    <FormControl>
                      <Input
                        data-testid="input-beneficiaryName"
                        placeholder={beneficiaryName}
                        {...field}
                        defaultValue={beneficiaryName}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <FormField
                control={form.control}
                name="message"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t.thankYou.message}</FormLabel>
                    <FormControl>
                      <Textarea
                        data-testid="input-thankYouMessage"
                        rows={5}
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <Button
                type="submit"
                className="w-full"
                disabled={submitThankYou.isPending}
                data-testid="button-submitThankYou"
              >
                {submitThankYou.isPending ? t.common.loading : t.thankYou.submitLabel}
              </Button>
            </form>
          </Form>
        </CardContent>
      </Card>

      <div className="mt-4 text-center">
        <Link href={`/track/${params.id}`}>
          <Button variant="ghost" size="sm">{t.common.back}</Button>
        </Link>
      </div>
    </div>
  );
}