import { useState } from 'react';
import type { ReactNode } from 'react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import { Textarea } from '@/components/ui/textarea';
import { fileUrl } from '../lib/api';
import { ProvidersBar } from './ProvidersBar';
import { useProviders } from './useProviders';
import { BACKGROUNDS, QUALITIES, SIZES, useGenerateManager } from './useGenerateManager';

export const Generate = () => {
  const providers = useProviders();
  // The model lives here, between the two: chosen in the bar above, used by the form below.
  const [model, setModel] = useState('');
  const manager = useGenerateManager(providers.providers, model);

  return (
    <div className="h-full space-y-6 overflow-y-auto p-4">
      {/* Which provider and model, then what to make with it — one panel, in that order. */}
      <ProvidersBar manager={providers} model={model} onModelChange={setModel} />

      {!providers.loading && manager.usableProviders.length === 0 && (
        <p className="text-sm text-muted-foreground">No provider has a key yet — add one above.</p>
      )}

      <div className="space-y-2">
        <Label htmlFor="atelier-prompt">Prompt</Label>
        <Textarea
          id="atelier-prompt"
          rows={4}
          placeholder="a voxel duck in a beret, painting at an easel"
          value={manager.prompt}
          onChange={(ev) => manager.setPrompt(ev.target.value)}
        />
      </div>

      <div className="grid gap-4 sm:grid-cols-2">
        <Field label="Count" id="atelier-n">
          <Input
            id="atelier-n"
            type="number"
            min={1}
            max={10}
            value={manager.n}
            onChange={(ev) => manager.setN(Math.min(10, Math.max(1, Number(ev.target.value) || 1)))}
          />
        </Field>

        <Choice label="Size" id="atelier-size" value={manager.size} onChange={manager.setSize} options={SIZES} />
        <Choice
          label="Quality"
          id="atelier-quality"
          value={manager.quality}
          onChange={manager.setQuality}
          options={QUALITIES}
        />
        <Choice
          label="Background"
          id="atelier-background"
          value={manager.background}
          onChange={manager.setBackground}
          options={BACKGROUNDS}
        />
      </div>

      <div className="flex items-center gap-4">
        <Button disabled={!manager.ready} onClick={manager.generate}>
          {manager.running ? 'Generating…' : 'Generate'}
        </Button>
        {manager.job?.atelier && manager.running && (
          <span className="text-sm text-muted-foreground">{manager.job.atelier.status}…</span>
        )}
      </div>

      {manager.error && <p className="text-sm text-destructive">{manager.error}</p>}

      {manager.job?.data && manager.job.data.length > 0 && (
        <div className="grid gap-4 sm:grid-cols-2">
          {manager.job.data.map((image) => (
            <figure key={image.url} className="space-y-2">
              <img src={fileUrl(image.url) ?? undefined} alt={manager.prompt} className="w-full rounded-lg border border-border" />
              <figcaption className="truncate text-xs text-muted-foreground">{image.revised_prompt ?? ''}</figcaption>
            </figure>
          ))}
        </div>
      )}

      {manager.job?.atelier?.images.some((image) => image.error) && (
        <ul className="space-y-1 text-sm text-destructive">
          {manager.job.atelier.images
            .filter((image) => image.error)
            .map((image) => (
              <li key={image.id}>{image.error}</li>
            ))}
        </ul>
      )}
    </div>
  );
};

const Field = ({ label, id, children }: { label: string; id: string; children: ReactNode }) => (
  <div className="space-y-2">
    <Label htmlFor={id}>{label}</Label>
    {children}
  </div>
);

type ChoiceProps = {
  label: string;
  id: string;
  value: string;
  onChange: (value: string) => void;
  options: readonly string[];
};

const Choice = ({ label, id, value, onChange, options }: ChoiceProps) => (
  <Field label={label} id={id}>
    <Select value={value} onValueChange={onChange}>
      <SelectTrigger id={id} className="w-full">
        <SelectValue />
      </SelectTrigger>
      <SelectContent>
        {options.map((option) => (
          <SelectItem key={option} value={option}>
            {option}
          </SelectItem>
        ))}
      </SelectContent>
    </Select>
  </Field>
);