// Enhanced Natural Language Scene Parser
// Converts user descriptions into comprehensive structured scene data

export class SceneParser {
  constructor() {
    this.keywords = {
      environments: {
        forest: ['forest', 'woods', 'jungle', 'trees', 'woodland'],
        beach: ['beach', 'shore', 'ocean', 'seaside', 'coast'],
        desert: ['desert', 'sand', 'dunes', 'arid'],
        city: ['city', 'urban', 'street', 'building', 'metropolis'],
        lab: ['lab', 'laboratory', 'sci-fi', 'futuristic', 'science'],
        room: ['room', 'indoor', 'interior', 'chamber'],
        space: ['space', 'planet', 'alien', 'cosmic', 'astronomical'],
        underwater: ['underwater', 'ocean floor', 'sea', 'aquatic'],
        magical: ['magical', 'enchanted', 'mystical', 'fantasy']
      },
      lighting: {
        day: ['day', 'daylight', 'sunny', 'bright'],
        night: ['night', 'dark', 'moonlight', 'stars', 'nocturnal'],
        sunset: ['sunset', 'dusk', 'evening', 'golden hour', 'twilight'],
        sunrise: ['sunrise', 'dawn', 'morning', 'aurora'],
        indoor: ['indoor', 'artificial', 'fluorescent', 'lamp'],
        blue: ['blue light', 'blue ambient', 'cyan', 'azure'],
        warm: ['warm', 'orange', 'amber', 'firelight']
      },
      objects: {
        tree: ['tree', 'palm', 'oak', 'pine', 'cedar'],
        mushroom: ['mushroom', 'fungus', 'toadstool', 'glowing mushroom'],
        fire: ['fire', 'campfire', 'flame', 'bonfire', 'torch'],
        rock: ['rock', 'stone', 'boulder', 'pebble'],
        water: ['water', 'ocean', 'sea', 'lake', 'river', 'pond'],
        building: ['building', 'house', 'structure', 'tower'],
        vehicle: ['car', 'vehicle', 'truck', 'bike', 'automobile'],
        firefly: ['firefly', 'fireflies', 'lightning bug', 'glowing bug'],
        wizard: ['wizard', 'mage', 'sorcerer', 'magician'],
        character: ['character', 'person', 'human', 'avatar', 'npc']
      },
      materials: {
        metal: ['metal', 'metallic', 'steel', 'iron', 'bronze'],
        wood: ['wood', 'wooden', 'timber', 'oak', 'pine'],
        glass: ['glass', 'transparent', 'clear', 'crystal'],
        fabric: ['fabric', 'cloth', 'textile', 'fabric'],
        stone: ['stone', 'rock', 'concrete', 'marble', 'granite'],
        glowing: ['glowing', 'emissive', 'luminous', 'radiant', 'shining'],
        magical: ['magical', 'enchanted', 'mystical', 'ethereal']
      },
      effects: {
        fog: ['fog', 'mist', 'haze', 'vapor', 'cloud'],
        rain: ['rain', 'rainy', 'storm', 'precipitation'],
        snow: ['snow', 'snowy', 'blizzard', 'flurry'],
        bloom: ['bloom', 'glow', 'bright', 'halo'],
        particles: ['particles', 'sparkles', 'dust', 'debris']
      },
      audio: {
        ambient: ['ambient', 'background', 'music', 'soundtrack', 'atmosphere'],
        spatial: ['spatial', 'positional', '3d sound', 'surround'],
        nature: ['nature', 'birds', 'wind', 'water', 'forest sounds'],
        magical: ['magical', 'mystical', 'enchanted', 'fantasy music']
      },
      animations: {
        walk: ['walk', 'walking', 'stroll', 'pace'],
        run: ['run', 'running', 'sprint'],
        sit: ['sit', 'sitting', 'rest'],
        stand: ['stand', 'standing', 'idle'],
        fly: ['fly', 'flying', 'hover', 'float'],
        glow: ['glow', 'pulse', 'flicker', 'animate']
      }
    };
  }

  parse(description) {
    const lowerDesc = description.toLowerCase();
    const scene = {
      sceneName: this.extractSceneName(description),
      environment: this.detectEnvironment(lowerDesc),
      lighting: this.detectLighting(lowerDesc),
      objects: this.extractObjects(lowerDesc, description),
      materials: this.detectMaterials(lowerDesc),
      effects: this.detectEffects(lowerDesc),
      avatar: this.extractAvatar(lowerDesc, description),
      audio: this.extractAudio(lowerDesc, description),
      camera: this.detectCamera(lowerDesc)
    };

    // Fill defaults
    this.fillDefaults(scene);
    
    return scene;
  }

  extractSceneName(description) {
    // Try to extract a name from quotes or first few words
    const match = description.match(/"([^"]+)"/);
    if (match) return match[1];
    
    const words = description.split(/\s+/).slice(0, 3);
    return words.join('_').replace(/[^a-z0-9_]/gi, '') || 'generated_scene';
  }

  detectEnvironment(desc) {
    for (const [env, keywords] of Object.entries(this.keywords.environments)) {
      if (keywords.some(kw => desc.includes(kw))) {
        return env;
      }
    }
    return 'room'; // default
  }

  detectLighting(desc) {
    const lighting = {
      type: 'day',
      hdri: null,
      sun_energy: 3.0,
      sun_angle: 0.5,
      ambient_strength: 0.3,
      color_temperature: 5500,
      color: [1, 1, 1],
      lights: []
    };

    if (this.keywords.lighting.night.some(kw => desc.includes(kw))) {
      lighting.type = 'night';
      lighting.sun_energy = 0.5;
      lighting.ambient_strength = 0.1;
      lighting.color_temperature = 2000;
      lighting.hdri = 'night_sky';
      lighting.color = [0.2, 0.2, 0.4];
    } else if (this.keywords.lighting.sunset.some(kw => desc.includes(kw))) {
      lighting.type = 'sunset';
      lighting.sun_energy = 2.0;
      lighting.color_temperature = 3000;
      lighting.hdri = 'sunset_sky';
      lighting.color = [1, 0.6, 0.3];
    } else if (this.keywords.lighting.sunrise.some(kw => desc.includes(kw))) {
      lighting.type = 'sunrise';
      lighting.sun_energy = 2.5;
      lighting.color_temperature = 4000;
      lighting.hdri = 'sunrise_sky';
      lighting.color = [1, 0.8, 0.5];
    }

    // Detect blue ambient light
    if (this.keywords.lighting.blue.some(kw => desc.includes(kw))) {
      lighting.color = [0.3, 0.5, 1.0];
      lighting.ambient_strength = 0.4;
      lighting.lights.push({
        type: 'AMBIENT',
        color: [0.2, 0.3, 0.8],
        energy: 0.5
      });
    }

    return lighting;
  }

  extractObjects(desc, fullDesc) {
    const objects = [];
    let objIndex = 0;

    // Count objects - improved matching
    const counts = {};
    for (const [type, keywords] of Object.entries(this.keywords.objects)) {
      const matches = keywords.filter(kw => desc.includes(kw));
      if (matches.length > 0) {
        // Try to find number before the keyword
        const countMatch = fullDesc.match(new RegExp(`(\\d+)\\s+${matches[0]}`, 'i'));
        const count = countMatch ? parseInt(countMatch[1]) : 
                     (type === 'firefly' ? 10 : type === 'mushroom' ? 5 : 1);
        counts[type] = count;
      }
    }

    // Create objects
    for (const [type, count] of Object.entries(counts)) {
      for (let i = 0; i < count; i++) {
        objects.push(this.createObject(type, objIndex++, objects.length));
      }
    }

    // Extract custom objects from description
    const customMatches = fullDesc.match(/(\d+)\s+(\w+)/gi);
    if (customMatches) {
      customMatches.forEach(match => {
        const parts = match.match(/(\d+)\s+(\w+)/i);
        if (parts && !this.keywords.objects[parts[2].toLowerCase()]) {
          const count = parseInt(parts[1]);
          for (let i = 0; i < count; i++) {
            objects.push(this.createObject('cube', objIndex++, objects.length, parts[2]));
          }
        }
      });
    }

    return objects;
  }

  createObject(type, index, position, name = null) {
    const base = {
      type: 'cube',
      name: name || `${type}_${index}`,
      location: [
        (position % 5 - 2) * 2 + (Math.random() - 0.5) * 0.5,
        Math.floor(position / 5) * 2 + (Math.random() - 0.5) * 0.5,
        0.5
      ],
      rotation: [0, 0, 0],
      scale: [1, 1, 1],
      color: [0.8, 0.8, 0.8, 1],
      metallic: 0.0,
      roughness: 0.5
    };

    // Type-specific defaults
    switch (type) {
      case 'tree':
        base.type = 'cylinder';
        base.scale = [0.3, 0.3, 3];
        base.location[2] = 1.5;
        base.color = [0.2, 0.6, 0.2, 1];
        base.roughness = 0.8;
        break;
      case 'mushroom':
        base.type = 'sphere';
        base.scale = [0.3, 0.3, 0.4];
        base.location[2] = 0.2;
        base.color = [0.8, 0.2, 0.8, 1];
        base.emission = [0.5, 0.1, 0.5, 1];
        base.emissionStrength = 2.0;
        base.roughness = 0.3;
        break;
      case 'fire':
        base.type = 'cone';
        base.scale = [0.5, 0.5, 1];
        base.location[2] = 0.5;
        base.color = [1, 0.3, 0, 1];
        base.emission = [1, 0.5, 0, 1];
        base.emissionStrength = 3.0;
        base.roughness = 0.2;
        break;
      case 'firefly':
        base.type = 'sphere';
        base.scale = [0.05, 0.05, 0.05];
        base.location[2] = 1.5 + Math.random() * 0.5;
        base.color = [1, 1, 0.5, 1];
        base.emission = [1, 1, 0.3, 1];
        base.emissionStrength = 5.0;
        base.roughness = 0.1;
        base.animation = { type: 'float', speed: 1.0 };
        break;
      case 'rock':
        base.type = 'sphere';
        base.scale = [0.8, 0.8, 0.6];
        base.color = [0.4, 0.4, 0.4, 1];
        base.roughness = 0.9;
        break;
      case 'water':
        base.type = 'plane';
        base.scale = [10, 10, 1];
        base.location[2] = 0;
        base.color = [0.2, 0.5, 0.8, 0.7];
        base.metallic = 0.1;
        base.roughness = 0.1;
        break;
    }

    return base;
  }

  detectMaterials(desc) {
    const materials = {};
    for (const [mat, keywords] of Object.entries(this.keywords.materials)) {
      if (keywords.some(kw => desc.includes(kw))) {
        materials[mat] = true;
      }
    }
    return materials;
  }

  detectEffects(desc) {
    const effects = {};
    for (const [effect, keywords] of Object.entries(this.keywords.effects)) {
      if (keywords.some(kw => desc.includes(kw))) {
        effects[effect] = true;
      }
    }
    return effects;
  }

  extractAvatar(desc, fullDesc) {
    const avatar = {
      present: desc.includes('avatar') || desc.includes('character') || desc.includes('person') ||
               desc.includes('wizard') || desc.includes('mage') || desc.includes('sorcerer'),
      action: 'stand',
      position: [0, 0, 0],
      name: 'Avatar',
      scale: 1.0
    };

    if (avatar.present) {
      // Detect wizard/mage
      if (desc.includes('wizard') || desc.includes('mage') || desc.includes('sorcerer')) {
        avatar.name = 'Wizard';
        avatar.scale = 1.0;
      }

      // Detect actions
      for (const [action, keywords] of Object.entries(this.keywords.animations)) {
        if (keywords.some(kw => desc.includes(kw))) {
          avatar.action = action;
          break;
        }
      }

      // Position based on action
      if (avatar.action === 'sit') {
        avatar.position[2] = 0.5;
      } else if (avatar.action === 'walk') {
        avatar.position = [0, 0, 0];
        avatar.animation = { type: 'walk', speed: 1.0 };
      }
    }

    return avatar;
  }

  extractAudio(desc, fullDesc) {
    const audio = {
      ambient: [],
      spatial: []
    };

    // Detect ambient sounds
    if (desc.includes('wave') || desc.includes('ocean')) {
      audio.ambient.push({ type: 'ocean_waves', volume: 0.5, loop: true });
    }
    if (desc.includes('wind') || desc.includes('breeze')) {
      audio.ambient.push({ type: 'wind', volume: 0.3, loop: true });
    }
    if (desc.includes('music') || desc.includes('soundtrack') || desc.includes('background')) {
      const isMagical = desc.includes('magical') || desc.includes('mystical') || desc.includes('enchanted');
      audio.ambient.push({ 
        type: isMagical ? 'magical_ambient' : 'ambient_music', 
        volume: 0.4, 
        loop: true 
      });
    }
    if (this.keywords.audio.magical.some(kw => desc.includes(kw))) {
      audio.ambient.push({ type: 'magical_ambient', volume: 0.5, loop: true });
    }

    // Detect spatial sounds
    if (desc.includes('fire') || desc.includes('campfire')) {
      audio.spatial.push({ type: 'fire_crackle', position: [0, 0, 0], volume: 0.4, loop: true });
    }

    return audio;
  }

  detectCamera(desc) {
    const camera = {
      position: [4, -4, 2.2],
      rotation: [1.05, 0, 0.78],
      fov: 50
    };

    if (desc.includes('close') || desc.includes('close-up')) {
      camera.position = [2, -2, 1.5];
    } else if (desc.includes('far') || desc.includes('wide')) {
      camera.position = [8, -8, 4];
      camera.fov = 70;
    }

    return camera;
  }

  fillDefaults(scene) {
    // Ensure lighting exists
    if (!scene.lighting.lights) {
      scene.lighting.lights = [];
    }

    // Add environment-specific objects
    if (scene.environment === 'forest' && scene.objects.filter(o => o.name.includes('tree')).length === 0) {
      for (let i = 0; i < 5; i++) {
        scene.objects.push(this.createObject('tree', i, scene.objects.length));
      }
    }

    if (scene.environment === 'beach' && scene.objects.filter(o => o.name.includes('water')).length === 0) {
      scene.objects.push(this.createObject('water', 0, scene.objects.length));
    }

    // Add magical forest elements
    if (scene.environment === 'magical' || scene.environment === 'forest') {
      const hasMushrooms = scene.objects.some(o => o.name.includes('mushroom'));
      const hasFireflies = scene.objects.some(o => o.name.includes('firefly'));
      
      if (!hasMushrooms && scene.effects && !scene.effects.fog) {
        // Add some mushrooms if not present
        for (let i = 0; i < 3; i++) {
          scene.objects.push(this.createObject('mushroom', i, scene.objects.length));
        }
      }
    }

    // Add ground plane
    scene.ground = {
      type: 'plane',
      size: 20,
      texture: scene.environment === 'beach' ? 'sand' : 
               scene.environment === 'forest' || scene.environment === 'magical' ? 'grass' : 'concrete',
      color: scene.environment === 'beach' ? [0.9, 0.8, 0.6, 1] :
             scene.environment === 'forest' || scene.environment === 'magical' ? [0.2, 0.4, 0.2, 1] : 
             [0.5, 0.5, 0.5, 1],
      roughness: 0.8,
      metallic: 0.0
    };

    // Add default sun if not specified
    if (scene.lighting.type === 'day' && scene.lighting.lights.filter(l => l.type === 'SUN').length === 0) {
      scene.lighting.lights.push({
        type: 'SUN',
        location: [10, -10, 10],
        energy: scene.lighting.sun_energy,
        angle: scene.lighting.sun_angle,
        color: scene.lighting.color
      });
    }

    // Add night lighting if needed
    if (scene.lighting.type === 'night' && scene.lighting.lights.length === 0) {
      scene.lighting.lights.push({
        type: 'POINT',
        location: [0, 0, 3],
        energy: 50,
        color: [0.3, 0.3, 0.5]
      });
    }
  }
}