import { useEffect, useRef, useState } from "react";
import { Controller, type UseFormReturn } from "react-hook-form";
import { useTranslation } from "react-i18next";
import { toast } from "sonner";
import { Card, CardContent } from "@/components/ui/card";
import { Field, FieldError, FieldLabel } from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { TabsContent } from "@/components/ui/tabs";
import { Textarea } from "@/components/ui/textarea";
import { env } from "@/config";
import type { MemShellFormSchema } from "@/types/schema";
import { OptionalClassFormField } from "./classname-field";
import { ShellTypeFormField } from "./shelltype-field";
import { UrlPatternFormField } from "./urlpattern-field";

export default function CustomTabContent({
  form,
  shellTypes,
}: Readonly<{
  form: UseFormReturn<MemShellFormSchema>;
  shellTypes: Array<string>;
}>) {
  const [isFile, setIsFile] = useState(false);
  const { t } = useTranslation(["memshell", "common"]);
  const shellClassBase64 = form.watch("shellClassBase64");
  const lastParsedBase64Ref = useRef<string | undefined>(undefined);
  const classNameEndpoint = `${env.API_URL}/api/className`;

  useEffect(() => {
    if (!shellClassBase64) {
      lastParsedBase64Ref.current = undefined as string | undefined;
      return;
    }

    if (shellClassBase64 === lastParsedBase64Ref.current) {
      return;
    }

    const controller = new AbortController();
    const timer = setTimeout(() => {
      const parseClassName = async () => {
        try {
          const response = await fetch(classNameEndpoint, {
            method: "POST",
            headers: {
              "Content-Type": "text/plain",
            },
            body: shellClassBase64,
            signal: controller.signal,
          });

          if (!response.ok) {
            throw new Error(response.statusText);
          }

          const className = await response.text();

          if (!className) {
            throw new Error("EMPTY_CLASS_NAME");
          }

          lastParsedBase64Ref.current = shellClassBase64;
          form.setValue("shellClassName", className, {
            shouldDirty: true,
          });
        } catch (error) {
          if ((error as Error)?.name === "AbortError") {
            return;
          }

          toast.error(t("memshell:tips.classNameParseFailed"));
        }
      };

      void parseClassName();
    }, 400);

    return () => {
      clearTimeout(timer);
      controller.abort();
    };
  }, [classNameEndpoint, form, shellClassBase64, t]);

  return (
    <TabsContent value="Custom">
      <Card>
        <CardContent className="space-y-2 mt-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-2">
            <ShellTypeFormField form={form} shellTypes={shellTypes} />
            <UrlPatternFormField form={form} />
          </div>
          <Controller
            control={form.control}
            name="shellClassBase64"
            render={({ field, fieldState }) => (
              <Field className="gap-1">
                <FieldLabel>{t("shellClass")}</FieldLabel>
                <RadioGroup
                  value={isFile ? "file" : "base64"}
                  onValueChange={(value) => {
                    field.onChange("");
                    setIsFile(value === "file");
                  }}
                  className="flex items-center"
                >
                  <div className="flex items-center">
                    <RadioGroupItem value="base64" id="optionOne" />
                    <Label htmlFor="optionOne">Base64</Label>
                  </div>
                  <div className="flex items-center">
                    <RadioGroupItem value="file" id="optionTwo" />
                    <Label htmlFor="optionTwo">File</Label>
                  </div>
                </RadioGroup>
                <div className="mt-2">
                  {isFile ? (
                    <Input
                      onChange={(e) => {
                        const file = e.target.files?.[0];
                        if (file) {
                          const reader = new FileReader();
                          reader.onload = (event) => {
                            const base64String =
                              (event.target?.result as string)?.split(",")[1] ||
                              "";
                            field.onChange(base64String);
                          };
                          reader.readAsDataURL(file);
                        }
                      }}
                      accept=".class"
                      placeholder={t("common:placeholders.input")}
                      type="file"
                    />
                  ) : (
                    <Textarea
                      {...field}
                      placeholder={t("common:placeholders.input")}
                      className="h-24"
                    />
                  )}
                </div>
                {fieldState.error && <FieldError errors={[fieldState.error]} />}
              </Field>
            )}
          />
          <OptionalClassFormField form={form} />
        </CardContent>
      </Card>
    </TabsContent>
  );
}