import { zodResolver } from '@hookform/resolvers/zod';
import { AnimatePresence, motion } from 'framer-motion';
import { Loader2, Sparkles } from 'lucide-react';
import { useEffect, useRef, useState } from 'react';
import { useForm } from 'react-hook-form';
import * as z from 'zod';
import { Button } from '@/components/ui/button';
import { Form, FormControl, FormField, FormItem, FormMessage } from '@/components/ui/form';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import { Textarea } from '@/components/ui/textarea';
import { useToast } from '@/components/ui/use-toast';
import { apiClient } from '@/lib/api/client';
import { LANGUAGE_CODES, LANGUAGE_OPTIONS, type LanguageCode } from '@/lib/constants/languages';
import { useGeneration } from '@/lib/hooks/useGeneration';
import { useModelDownloadToast } from '@/lib/hooks/useModelDownloadToast';
import { useProfile } from '@/lib/hooks/useProfiles';
import { useGenerationStore } from '@/stores/generationStore';
import { usePlayerStore } from '@/stores/playerStore';
import { useUIStore } from '@/stores/uiStore';

const generationSchema = z.object({
  text: z.string().min(1, 'Text is required').max(5000),
  language: z.enum(LANGUAGE_CODES as [LanguageCode, ...LanguageCode[]]),
  modelSize: z.enum(['1.7B', '0.6B']).optional(),
});

type GenerationFormValues = z.infer<typeof generationSchema>;

interface FloatingGenerateBoxProps {
  isPlayerOpen: boolean;
}

export function FloatingGenerateBox({ isPlayerOpen }: FloatingGenerateBoxProps) {
  const selectedProfileId = useUIStore((state) => state.selectedProfileId);
  const { data: selectedProfile } = useProfile(selectedProfileId || '');
  const generation = useGeneration();
  const { toast } = useToast();
  const setAudio = usePlayerStore((state) => state.setAudio);
  const setIsGenerating = useGenerationStore((state) => state.setIsGenerating);
  const [downloadingModelName, setDownloadingModelName] = useState<string | null>(null);
  const [downloadingDisplayName, setDownloadingDisplayName] = useState<string | null>(null);
  const [isExpanded, setIsExpanded] = useState(false);
  const containerRef = useRef<HTMLDivElement>(null);

  useModelDownloadToast({
    modelName: downloadingModelName || '',
    displayName: downloadingDisplayName || '',
    enabled: !!downloadingModelName,
  });

  const form = useForm<GenerationFormValues>({
    resolver: zodResolver(generationSchema),
    defaultValues: {
      text: '',
      language: 'en',
      modelSize: '1.7B',
    },
  });

  // Click away handler to collapse the box
  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      const target = event.target as HTMLElement;

      // Don't collapse if clicking inside the container
      if (containerRef.current?.contains(target)) {
        return;
      }

      // Don't collapse if clicking on a Select dropdown (which renders in a portal)
      if (
        target.closest('[role="listbox"]') ||
        target.closest('[data-radix-popper-content-wrapper]')
      ) {
        return;
      }

      setIsExpanded(false);
    }

    if (isExpanded) {
      document.addEventListener('mousedown', handleClickOutside);
    }

    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [isExpanded]);

  async function onSubmit(data: GenerationFormValues) {
    if (!selectedProfileId) {
      toast({
        title: 'No profile selected',
        description: 'Please select a voice profile from the cards above.',
        variant: 'destructive',
      });
      return;
    }

    try {
      setIsGenerating(true);

      const modelName = `qwen-tts-${data.modelSize}`;
      const displayName = data.modelSize === '1.7B' ? 'Qwen TTS 1.7B' : 'Qwen TTS 0.6B';

      try {
        const modelStatus = await apiClient.getModelStatus();
        const model = modelStatus.models.find((m) => m.model_name === modelName);

        if (model && !model.downloaded) {
          setDownloadingModelName(modelName);
          setDownloadingDisplayName(displayName);
        }
      } catch (error) {
        console.error('Failed to check model status:', error);
      }

      const result = await generation.mutateAsync({
        profile_id: selectedProfileId,
        text: data.text,
        language: data.language,
        model_size: data.modelSize,
      });

      toast({
        title: 'Generation complete!',
        description: `Audio generated (${result.duration.toFixed(2)}s)`,
      });

      const audioUrl = apiClient.getAudioUrl(result.id);
      setAudio(audioUrl, result.id, data.text.substring(0, 50));

      form.reset();
      setIsExpanded(false);
    } catch (error) {
      toast({
        title: 'Generation failed',
        description: error instanceof Error ? error.message : 'Failed to generate audio',
        variant: 'destructive',
      });
    } finally {
      setIsGenerating(false);
      setDownloadingModelName(null);
      setDownloadingDisplayName(null);
    }
  }

  return (
    <motion.div
      ref={containerRef}
      className="fixed left-[calc(5rem+2rem)] right-auto w-[calc((100%-5rem-4rem)/2-1rem)]"
      style={{
        bottom: isPlayerOpen ? 'calc(7rem + 1.5rem)' : '1.5rem',
      }}
    >
      <motion.div
        className="bg-background/30 backdrop-blur-2xl border border-accent/20 rounded-[2rem] shadow-2xl hover:bg-background/40 hover:border-accent/20 transition-all duration-300 overflow-hidden p-3"
        transition={{ duration: 0.6, ease: 'easeInOut' }}
      >
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)}>
            <div className="flex gap-2">
              <motion.div
                className="flex-1"
                // animate={{ marginBottom: isExpanded ? '0.75rem' : '0' }}
                transition={{ duration: 0.3, ease: 'easeOut' }}
              >
                <FormField
                  control={form.control}
                  name="text"
                  render={({ field }) => (
                    <FormItem>
                      <FormControl>
                        <Textarea
                          placeholder={
                            selectedProfile
                              ? `Generate speech using ${selectedProfile.name}...`
                              : 'Select a voice profile above...'
                          }
                          className="resize-none bg-transparent border-none focus-visible:ring-0 focus-visible:ring-offset-0 focus:outline-none focus:ring-0 outline-none ring-0 rounded-2xl text-sm placeholder:text-muted-foreground/60 overflow-hidden transition-all"
                          style={{
                            minHeight: isExpanded ? '100px' : '32px',
                            height: isExpanded ? '100px' : '32px',
                          }}
                          disabled={!selectedProfileId}
                          onClick={() => setIsExpanded(true)}
                          onFocus={() => setIsExpanded(true)}
                          {...field}
                        />
                      </FormControl>
                      <FormMessage className="text-xs" />
                    </FormItem>
                  )}
                />
              </motion.div>

              <Button
                type="submit"
                disabled={generation.isPending || !selectedProfileId}
                className="h-10 w-10 rounded-full bg-accent hover:bg-accent/90 hover:scale-105 text-accent-foreground shadow-lg hover:shadow-accent/50 shrink-0 transition-all duration-200"
                size="icon"
              >
                {generation.isPending ? (
                  <Loader2 className="h-4 w-4 animate-spin" />
                ) : (
                  <Sparkles className="h-4 w-4" />
                )}
              </Button>
            </div>

            <AnimatePresence>
              <motion.div
                initial={{ height: 0, opacity: 0 }}
                animate={{ height: 'auto', opacity: 1 }}
                exit={{ height: 0, opacity: 0 }}
                transition={{ duration: 0.3, ease: 'easeOut' }}
                className=" mt-3"
              >
                <div className="flex items-center gap-2">
                  <FormField
                    control={form.control}
                    name="language"
                    render={({ field }) => (
                      <FormItem className="flex-1">
                        <Select onValueChange={field.onChange} defaultValue={field.value}>
                          <FormControl>
                            <SelectTrigger className="h-8 text-xs bg-card border-border rounded-full hover:bg-background/50 transition-all">
                              <SelectValue />
                            </SelectTrigger>
                          </FormControl>
                          <SelectContent>
                            {LANGUAGE_OPTIONS.map((lang) => (
                              <SelectItem key={lang.value} value={lang.value} className="text-xs">
                                {lang.label}
                              </SelectItem>
                            ))}
                          </SelectContent>
                        </Select>
                        <FormMessage className="text-xs" />
                      </FormItem>
                    )}
                  />

                  <FormField
                    control={form.control}
                    name="modelSize"
                    render={({ field }) => (
                      <FormItem className="flex-1">
                        <Select onValueChange={field.onChange} defaultValue={field.value}>
                          <FormControl>
                            <SelectTrigger className="h-8 text-xs bg-card border-border rounded-full hover:bg-background/50 transition-all">
                              <SelectValue />
                            </SelectTrigger>
                          </FormControl>
                          <SelectContent>
                            <SelectItem value="1.7B" className="text-xs text-muted-foreground">
                              Qwen3-TTS 1.7B
                            </SelectItem>
                            <SelectItem value="0.6B" className="text-xs text-muted-foreground">
                              Qwen3-TTS 0.6B
                            </SelectItem>
                          </SelectContent>
                        </Select>
                        <FormMessage className="text-xs" />
                      </FormItem>
                    )}
                  />
                </div>
              </motion.div>
            </AnimatePresence>
          </form>
        </Form>
      </motion.div>
    </motion.div>
  );
}