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"use client";

import { useState } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { z } from "zod";
import { useMutation, useQueryClient } from "@tanstack/react-query";
import { Sparkles, Loader2 } from "lucide-react";
import { generationsApi, type GenerationRequest } from "@/lib/api";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Slider } from "@/components/ui/slider";
import { useToast } from "@/hooks/use-toast";
import { PromptSuggestions } from "@/components/prompt-suggestions";

const generationSchema = z.object({
  prompt: z.string().min(1, "Prompt is required").max(1000),
  lyrics: z.string().optional(),
  duration: z.number().min(5).max(300).optional(),
  style: z.string().optional(),
  voice_preset: z.string().optional(),
  vocal_volume: z.number().min(0).max(1).optional(),
  instrumental_volume: z.number().min(0).max(1).optional(),
});

type GenerationFormData = z.infer<typeof generationSchema>;

export function GenerationForm() {
  const [isExpanded, setIsExpanded] = useState(false);
  const [showSuggestions, setShowSuggestions] = useState(true);
  const { toast } = useToast();
  const queryClient = useQueryClient();

  const {
    register,
    handleSubmit,
    setValue,
    watch,
    formState: { errors },
  } = useForm<GenerationFormData>({
    resolver: zodResolver(generationSchema),
    defaultValues: {
      duration: 30,
      vocal_volume: 0.7,
      instrumental_volume: 0.8,
    },
  });

  const successMessages = [
    "๐ŸŽต Your masterpiece is being forged!",
    "๐ŸŽธ The AI musicians are tuning up!",
    "๐ŸŽน Composing your sonic masterpiece!",
    "๐ŸŽบ The orchestra is assembling!",
    "๐ŸŽผ Your music is coming to life!",
  ];

  const mutation = useMutation({
    mutationFn: (data: GenerationRequest) => generationsApi.create(data),
    onSuccess: () => {
      const randomMessage = successMessages[Math.floor(Math.random() * successMessages.length)];
      toast({
        title: randomMessage,
        description: "Watch the magic happen in your creations list below.",
      });
      queryClient.invalidateQueries({ queryKey: ["generations"] });
      setIsExpanded(false);
      setShowSuggestions(false);
    },
    onError: (error: Error) => {
      toast({
        title: "๐Ÿ˜” Oops! Something went wrong",
        description: error.message || "Failed to start generation. Please try again.",
        variant: "destructive",
      });
    },
  });

  const onSubmit = (data: GenerationFormData) => {
    mutation.mutate(data);
  };

  const handleSelectPrompt = (prompt: string) => {
    setValue("prompt", prompt);
    setShowSuggestions(false);
  };

  const promptValue = watch("prompt");
  const vocalVolume = watch("vocal_volume") ?? 0.7;
  const instrumentalVolume = watch("instrumental_volume") ?? 0.8;

  return (
    <div className="bg-card border rounded-lg p-6 shadow-lg hover:shadow-xl transition-all duration-300 group">

      <div className="mb-4 flex items-center gap-2">

        <div className="w-1 h-8 bg-gradient-to-b from-primary to-purple-500 rounded-full" />

        <h2 className="font-display text-2xl font-bold">Compose Something New</h2>

      </div>

      <form onSubmit={handleSubmit(onSubmit)} className="space-y-6">

        <div>

          <Label htmlFor="prompt" className="text-lg font-semibold flex items-center gap-2">

            <span className="text-2xl">๐ŸŽผ</span>

            Describe your music

          </Label>

          <Textarea

            id="prompt"

            {...register("prompt")}

            placeholder="Try: 'A dreamy lo-fi hip-hop beat with vinyl crackle and soft piano melodies' or 'Epic orchestral soundtrack with soaring strings and thunderous percussion'"

            className="mt-2 min-h-[120px] focus:ring-2 focus:ring-primary/50 transition-all"

          />

          {errors.prompt && (

            <p className="text-sm text-destructive mt-1 animate-fade-in">

              {errors.prompt.message}

            </p>

          )}

          <p className="text-xs text-muted-foreground mt-2">

            ๐Ÿ’ก Tip: Be specific about instruments, mood, tempo, and style for best results

          </p>

        </div>



        {showSuggestions && !promptValue && (

          <PromptSuggestions onSelectPrompt={handleSelectPrompt} />

        )}



        <div>

          <Label htmlFor="lyrics" className="text-base flex items-center gap-2">

            <span className="text-xl">๐ŸŽค</span>

            Lyrics (optional)

          </Label>

          <Textarea

            id="lyrics"

            {...register("lyrics")}

            placeholder="Add your lyrics here and we'll bring them to life with AI vocals...&#10;&#10;Verse 1:&#10;Walking through the city lights&#10;Everything feels so right..."

            className="mt-2 min-h-[100px] focus:ring-2 focus:ring-purple-500/50 transition-all"

          />

          <p className="text-xs text-muted-foreground mt-2">

            โœจ Pro tip: Structure your lyrics with verses, chorus, and bridge for better results

          </p>

        </div>



        {isExpanded && (

          <div className="space-y-4 pt-4 border-t">

            <div className="grid grid-cols-2 gap-4">

              <div>

                <Label htmlFor="duration">Duration (seconds)</Label>

                <Input

                  id="duration"

                  type="number"

                  {...register("duration", { valueAsNumber: true })}

                  min={5}

                  max={300}

                  className="mt-1"

                />

              </div>



              <div>

                <Label htmlFor="style">Style</Label>

                <Select

                  onValueChange={(value) => setValue("style", value === "auto" ? undefined : value)}

                  defaultValue="auto"

                >

                  <SelectTrigger id="style" className="mt-1">

                    <SelectValue placeholder="Auto-detect" />

                  </SelectTrigger>

                  <SelectContent>

                    <SelectItem value="auto">Auto-detect</SelectItem>

                    <SelectItem value="rock">Rock</SelectItem>

                    <SelectItem value="pop">Pop</SelectItem>

                    <SelectItem value="jazz">Jazz</SelectItem>

                    <SelectItem value="electronic">Electronic</SelectItem>

                    <SelectItem value="hip-hop">Hip-Hop</SelectItem>

                    <SelectItem value="classical">Classical</SelectItem>

                  </SelectContent>

                </Select>

              </div>

            </div>



            {watch("lyrics") && (

              <div className="space-y-2">

                <Label>Vocal Volume: {Math.round(vocalVolume * 100)}%</Label>

                <Slider

                  value={[vocalVolume]}

                  onValueChange={([value]) => setValue("vocal_volume", value)}

                  min={0}

                  max={1}

                  step={0.1}

                />

              </div>

            )}



            <div className="space-y-2">

              <Label>

                Instrumental Volume: {Math.round(instrumentalVolume * 100)}%

              </Label>

              <Slider

                value={[instrumentalVolume]}

                onValueChange={([value]) =>

                  setValue("instrumental_volume", value)

                }

                min={0}

                max={1}

                step={0.1}

              />

            </div>

          </div>

        )}



        <div className="flex gap-3">

          <Button

            type="submit"

            disabled={mutation.isPending}

            className="flex-1 relative overflow-hidden group/btn"

            size="lg"

          >

            <span className="absolute inset-0 bg-gradient-to-r from-primary via-purple-500 to-primary opacity-0 group-hover/btn:opacity-100 transition-opacity duration-500" />

            <span className="relative flex items-center justify-center">

              {mutation.isPending ? (

                <>

                  <Loader2 className="mr-2 h-5 w-5 animate-spin" />

                  <span className="animate-pulse">Forging your masterpiece...</span>

                </>

              ) : (

                <>

                  <Sparkles className="mr-2 h-5 w-5 group-hover/btn:animate-bounce-subtle" />

                  Generate Music

                </>

              )}

            </span>

          </Button>

          <Button

            type="button"

            variant="outline"

            onClick={() => setIsExpanded(!isExpanded)}

            className="hover:bg-secondary/80 transition-all"

          >

            {isExpanded ? "Less" : "More"} Options

          </Button>

        </div>
      </form>
    </div>
  );
}