'use client';

import { useState, useEffect } from 'react';
import { Header } from '@/components/header';
import { AppLayout } from '@/components/layout';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { PromptTextarea } from '@/components/prompt-textarea';
import { Label } from '@/components/ui/label';
import { Card, CardContent } from '@/components/ui/card';
import { InpaintingCanvas } from '@/components/inpainting-canvas';
import { apiClient, type JobInfo } from '@/lib/api';
import { Loader2, X, Download } from 'lucide-react';
import { downloadAuthenticatedImage } from '@/lib/utils';
import { useLocalStorage } from '@/lib/hooks';
import { ModelSelectionProvider, useModelSelection, useCheckpointSelection, useModelTypeSelection } from '@/contexts/model-selection-context';
import { EnhancedModelSelect, EnhancedModelSelectGroup } from '@/components/enhanced-model-select';
import { ModelSelectionWarning, AutoSelectionStatus } from '@/components/model-selection-indicator';

type InpaintingFormData = {
  prompt: string;
  negative_prompt: string;
  source_image: string;
  mask_image: string;
  steps: number;
  cfg_scale: number;
  seed: string;
  sampling_method: string;
  strength: number;
  width?: number;
  height?: number;
};

const defaultFormData: InpaintingFormData = {
  prompt: '',
  negative_prompt: '',
  source_image: '',
  mask_image: '',
  steps: 20,
  cfg_scale: 7.5,
  seed: '',
  sampling_method: 'euler_a',
  strength: 0.75,
  width: 512,
  height: 512,
};

function InpaintingForm() {
  const { state, actions } = useModelSelection();
  const {
    checkpointModels,
    selectedCheckpointModel,
    selectedCheckpoint,
    setSelectedCheckpoint,
    isAutoSelecting,
    warnings,
    error: checkpointError
  } = useCheckpointSelection();
  
  const {
    availableModels: vaeModels,
    selectedModel: selectedVae,
    isUserOverride: isVaeUserOverride,
    isAutoSelected: isVaeAutoSelected,
    setSelectedModel: setSelectedVae,
    setUserOverride: setVaeUserOverride,
    clearUserOverride: clearVaeUserOverride,
  } = useModelTypeSelection('vae');

  const [formData, setFormData] = useLocalStorage<InpaintingFormData>(
    'inpainting-form-data',
    defaultFormData
  );

  const [loading, setLoading] = useState(false);
  const [jobInfo, setJobInfo] = useState<JobInfo | null>(null);
  const [generatedImages, setGeneratedImages] = useState<string[]>([]);
  const [loraModels, setLoraModels] = useState<string[]>([]);
  const [embeddings, setEmbeddings] = useState<string[]>([]);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    const loadModels = async () => {
      try {
        const [modelsData, loras, embeds] = await Promise.all([
          apiClient.getModels(), // Get all models with enhanced info
          apiClient.getModels('lora'),
          apiClient.getModels('embedding'),
        ]);
        actions.setModels(modelsData.models);
        setLoraModels(loras.models.map(m => m.name));
        setEmbeddings(embeds.models.map(m => m.name));
      } catch (err) {
        console.error('Failed to load models:', err);
      }
    };
    loadModels();
  }, [actions]);

  // Update form data when checkpoint changes
  useEffect(() => {
    if (selectedCheckpoint) {
      setFormData(prev => ({
        ...prev,
        model: selectedCheckpoint,
      }));
    }
  }, [selectedCheckpoint, setFormData]);

  const handleInputChange = (
    e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement>
  ) => {
    const { name, value } = e.target;
    setFormData((prev) => ({
      ...prev,
      [name]: name === 'prompt' || name === 'negative_prompt' || name === 'seed' || name === 'sampling_method'
        ? value
        : Number(value),
    }));
  };

  const handleSourceImageChange = (image: string) => {
    setFormData((prev) => ({ ...prev, source_image: image }));
    setError(null);
  };

  const handleMaskImageChange = (image: string) => {
    setFormData((prev) => ({ ...prev, mask_image: image }));
    setError(null);
  };

  const pollJobStatus = async (jobId: string) => {
    const maxAttempts = 300;
    let attempts = 0;

    const poll = async () => {
      try {
        const status = await apiClient.getJobStatus(jobId);
        setJobInfo(status);

        if (status.status === 'completed') {
          let imageUrls: string[] = [];

          // Handle both old format (result.images) and new format (outputs)
          if (status.outputs && status.outputs.length > 0) {
            // New format: convert output URLs to authenticated image URLs with cache-busting
            imageUrls = status.outputs.map((output: any) => {
              const filename = output.filename;
              return apiClient.getImageUrl(jobId, filename);
            });
          } else if (status.result?.images && status.result.images.length > 0) {
            // Old format: convert image URLs to authenticated URLs
            imageUrls = status.result.images.map((imageUrl: string) => {
              // Extract filename from URL if it's already a full URL
              if (imageUrl.includes('/output/')) {
                const parts = imageUrl.split('/output/');
                if (parts.length === 2) {
                  const filename = parts[1].split('?')[0]; // Remove query params
                  return apiClient.getImageUrl(jobId, filename);
                }
              }
              // If it's just a filename, convert it directly
              return apiClient.getImageUrl(jobId, imageUrl);
            });
          }

          // Create a new array to trigger React re-render
          setGeneratedImages([...imageUrls]);
          setLoading(false);
        } else if (status.status === 'failed') {
          setError(status.error || 'Generation failed');
          setLoading(false);
        } else if (status.status === 'cancelled') {
          setError('Generation was cancelled');
          setLoading(false);
        } else if (attempts < maxAttempts) {
          attempts++;
          setTimeout(poll, 2000);
        } else {
          setError('Job polling timeout');
          setLoading(false);
        }
      } catch (err) {
        setError(err instanceof Error ? err.message : 'Failed to check job status');
        setLoading(false);
      }
    };

    poll();
  };

  const handleGenerate = async (e: React.FormEvent) => {
    e.preventDefault();

    if (!formData.source_image) {
      setError('Please upload a source image first');
      return;
    }

    if (!formData.mask_image) {
      setError('Please create a mask first');
      return;
    }

    setLoading(true);
    setError(null);
    setGeneratedImages([]);
    setJobInfo(null);

    try {
      // Validate model selection
      if (selectedCheckpointModel) {
        const validation = actions.validateSelection(selectedCheckpointModel);
        if (!validation.isValid) {
          setError(`Missing required models: ${validation.missingRequired.join(', ')}`);
          setLoading(false);
          return;
        }
      }

      const requestData = {
        ...formData,
        model: selectedCheckpoint || undefined,
        vae: selectedVae || undefined,
      };

      const job = await apiClient.inpainting(requestData);
      setJobInfo(job);
      const jobId = job.request_id || job.id;
      if (jobId) {
        await pollJobStatus(jobId);
      } else {
        setError('No job ID returned from server');
        setLoading(false);
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to generate image');
      setLoading(false);
    }
  };

  const handleCancel = async () => {
    const jobId = jobInfo?.request_id || jobInfo?.id;
    if (jobId) {
      try {
        await apiClient.cancelJob(jobId);
        setLoading(false);
        setError('Generation cancelled');
      } catch (err) {
        console.error('Failed to cancel job:', err);
      }
    }
  };

  return (
    <AppLayout>
      <Header title="Inpainting" description="Edit images by masking areas and regenerating with AI" />
      <div className="container mx-auto p-6">
        <div className="grid gap-6 lg:grid-cols-2">
          {/* Left Panel - Canvas and Form */}
          <div className="space-y-6">
            <InpaintingCanvas
              onSourceImageChange={handleSourceImageChange}
              onMaskImageChange={handleMaskImageChange}
              targetWidth={formData.width}
              targetHeight={formData.height}
            />

            <Card>
              <CardContent className="pt-6">
                <form onSubmit={handleGenerate} className="space-y-4">
                  <div className="space-y-2">
                    <Label htmlFor="prompt">Prompt *</Label>
                    <PromptTextarea
                      value={formData.prompt}
                      onChange={(value) => setFormData({ ...formData, prompt: value })}
                      placeholder="Describe what to generate in the masked areas..."
                      rows={3}
                      loras={loraModels}
                      embeddings={embeddings}
                    />
                    <p className="text-xs text-muted-foreground">
                      Tip: Use {'<lora:name:weight>'} for LoRAs and embedding names directly
                    </p>
                  </div>

                  <div className="space-y-2">
                    <Label htmlFor="negative_prompt">Negative Prompt</Label>
                    <PromptTextarea
                      value={formData.negative_prompt || ''}
                      onChange={(value) => setFormData({ ...formData, negative_prompt: value })}
                      placeholder="What to avoid in the generated areas..."
                      rows={2}
                      loras={loraModels}
                      embeddings={embeddings}
                    />
                  </div>

                  <div className="space-y-2">
                    <Label htmlFor="strength">
                      Strength: {formData.strength.toFixed(2)}
                    </Label>
                    <Input
                      id="strength"
                      name="strength"
                      type="range"
                      value={formData.strength}
                      onChange={handleInputChange}
                      min={0}
                      max={1}
                      step={0.05}
                    />
                    <p className="text-xs text-muted-foreground">
                      Lower values preserve more of the original image
                    </p>
                  </div>

                  <div className="grid grid-cols-2 gap-4">
                    <div className="space-y-2">
                      <Label htmlFor="width">Width</Label>
                      <Input
                        id="width"
                        name="width"
                        type="number"
                        value={formData.width}
                        onChange={handleInputChange}
                        step={64}
                        min={256}
                        max={2048}
                      />
                    </div>
                    <div className="space-y-2">
                      <Label htmlFor="height">Height</Label>
                      <Input
                        id="height"
                        name="height"
                        type="number"
                        value={formData.height}
                        onChange={handleInputChange}
                        step={64}
                        min={256}
                        max={2048}
                      />
                    </div>
                  </div>

                  <div className="grid grid-cols-2 gap-4">
                    <div className="space-y-2">
                      <Label htmlFor="steps">Steps</Label>
                      <Input
                        id="steps"
                        name="steps"
                        type="number"
                        value={formData.steps}
                        onChange={handleInputChange}
                        min={1}
                        max={150}
                      />
                    </div>
                    <div className="space-y-2">
                      <Label htmlFor="cfg_scale">CFG Scale</Label>
                      <Input
                        id="cfg_scale"
                        name="cfg_scale"
                        type="number"
                        value={formData.cfg_scale}
                        onChange={handleInputChange}
                        step={0.5}
                        min={1}
                        max={30}
                      />
                    </div>
                  </div>

                  <div className="space-y-2">
                    <Label htmlFor="seed">Seed (optional)</Label>
                    <Input
                      id="seed"
                      name="seed"
                      value={formData.seed}
                      onChange={handleInputChange}
                      placeholder="Leave empty for random"
                    />
                  </div>

                  <div className="space-y-2">
                    <Label htmlFor="sampling_method">Sampling Method</Label>
                    <select
                      id="sampling_method"
                      name="sampling_method"
                      value={formData.sampling_method}
                      onChange={handleInputChange}
                      className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm"
                    >
                      <option value="euler">Euler</option>
                      <option value="euler_a">Euler A</option>
                      <option value="heun">Heun</option>
                      <option value="dpm2">DPM2</option>
                      <option value="dpm++2s_a">DPM++ 2S A</option>
                      <option value="dpm++2m">DPM++ 2M</option>
                      <option value="dpm++2mv2">DPM++ 2M V2</option>
                      <option value="lcm">LCM</option>
                    </select>
                  </div>
  
                  {/* Model Selection Section */}
                  <EnhancedModelSelectGroup
                    title="Model Selection"
                    description="Select the checkpoint and additional models for generation"
                  >
                    {/* Checkpoint Selection */}
                    <div className="space-y-2">
                      <Label htmlFor="checkpoint">Checkpoint Model *</Label>
                      <select
                        id="checkpoint"
                        value={selectedCheckpoint || ''}
                        onChange={(e) => setSelectedCheckpoint(e.target.value || null)}
                        className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm"
                        disabled={isAutoSelecting}
                      >
                        <option value="">Select a checkpoint model...</option>
                        {checkpointModels.map((model) => (
                          <option key={model.id} value={model.name}>
                            {model.name} {model.loaded ? '(Loaded)' : ''}
                          </option>
                        ))}
                      </select>
                    </div>
  
                    {/* VAE Selection */}
                    <EnhancedModelSelect
                      modelType="vae"
                      label="VAE Model"
                      description="Optional VAE model for improved image quality"
                      value={selectedVae}
                      availableModels={vaeModels}
                      isAutoSelected={isVaeAutoSelected}
                      isUserOverride={isVaeUserOverride}
                      isLoading={isAutoSelecting}
                      onValueChange={setSelectedVae}
                      onSetUserOverride={setVaeUserOverride}
                      onClearOverride={clearVaeUserOverride}
                      placeholder="Use default VAE"
                    />
  
                    {/* Auto-selection Status */}
                    <div className="pt-2">
                      <AutoSelectionStatus
                        isAutoSelecting={isAutoSelecting}
                        hasAutoSelection={Object.keys(state.autoSelectedModels).length > 0}
                      />
                    </div>
  
                    {/* Warnings and Errors */}
                    <ModelSelectionWarning
                      warnings={warnings}
                      errors={error ? [error] : []}
                      onClearWarnings={actions.clearWarnings}
                    />
                  </EnhancedModelSelectGroup>
  
                  <div className="flex gap-2">
                    <Button
                      type="submit"
                      disabled={loading || !formData.source_image || !formData.mask_image}
                      className="flex-1"
                    >
                      {loading ? (
                        <>
                          <Loader2 className="h-4 w-4 animate-spin" />
                          Generating...
                        </>
                      ) : (
                        'Generate'
                      )}
                    </Button>
                    {loading && (
                      <Button type="button" variant="destructive" onClick={handleCancel}>
                        <X className="h-4 w-4" />
                        Cancel
                      </Button>
                    )}
                  </div>

                  {error && (
                    <div className="rounded-md bg-destructive/10 p-3 text-sm text-destructive">
                      {error}
                    </div>
                  )}

                  {loading && jobInfo && (
                    <div className="rounded-md bg-muted p-3 text-sm">
                      <p>Job ID: {jobInfo.id || jobInfo.request_id || 'N/A'}</p>
                      <p>Status: {jobInfo.status}</p>
                      {jobInfo.progress !== undefined && (
                        <p>Progress: {Math.round(jobInfo.progress * 100)}%</p>
                      )}
                    </div>
                  )}
                </form>
              </CardContent>
            </Card>
          </div>

          {/* Right Panel - Generated Images */}
          <Card>
            <CardContent className="pt-6">
              <div className="space-y-4">
                <h3 className="text-lg font-semibold">Generated Images</h3>
                {generatedImages.length === 0 ? (
                  <div className="flex h-96 items-center justify-center rounded-lg border-2 border-dashed border-border">
                    <p className="text-muted-foreground">
                      {loading ? 'Generating...' : 'Generated images will appear here'}
                    </p>
                  </div>
                ) : (
                  <div className="grid gap-4">
                    {generatedImages.map((image, index) => (
                      <div key={index} className="relative group">
                        <img
                          src={image}
                          alt={`Generated ${index + 1}`}
                          className="w-full rounded-lg border border-border"
                        />
                        <Button
                          size="icon"
                          variant="secondary"
                          className="absolute top-2 right-2 opacity-0 group-hover:opacity-100 transition-opacity"
                          onClick={() => {
                            const authToken = localStorage.getItem('auth_token');
                            const unixUser = localStorage.getItem('unix_user');
                            downloadAuthenticatedImage(image, `inpainting-${Date.now()}-${index}.png`, authToken || undefined, unixUser || undefined)
                              .catch(err => {
                                console.error('Failed to download image:', err);
                              });
                          }}
                        >
                          <Download className="h-4 w-4" />
                        </Button>
                      </div>
                    ))}
                  </div>
                )}
              </div>
            </CardContent>
          </Card>
        </div>
      </div>
    </AppLayout>
  );
}

export default function InpaintingPage() {
  return <InpaintingForm />;
}
