nano-pro/enhance_prompt.php

<?php
/**
 * Prompt Enhancement API
 * Uses Gemini AI to enhance cinematography prompts
 */

require_once 'config.php';
require_once 'webhook_logger.php';

header('Content-Type: application/json');

// Initialize auth status with default
$authStatus = [
    'authenticated' => true,
    'user' => [
        'name' => 'User',
        'preferred_username' => 'anonymous@nano-banana-pro.com'
    ]
];

// Check authentication (with graceful fallback)
try {
    if (file_exists(__DIR__ . '/AuthMiddleware.php')) {
        require_once 'AuthMiddleware.php';
        $auth = new AuthMiddleware();
        $authStatus = $auth->isAuthenticated();

        if (!$authStatus['authenticated']) {
            http_response_code(401);
            echo json_encode([
                'success' => false,
                'error' => 'Authentication required'
            ]);
            exit;
        }
    }
} catch (Exception $e) {
    // Log error but continue without auth (for testing)
    error_log("Auth check failed in enhance_prompt.php: " . $e->getMessage());
}

// Get POST data
$input = json_decode(file_get_contents('php://input'), true);

if (!$input) {
    echo json_encode(['success' => false, 'error' => 'Invalid input']);
    exit;
}

$sceneDescription = $input['sceneDescription'] ?? '';
$camera = $input['camera'] ?? '';
$lens = $input['lens'] ?? '';
$application = $input['application'] ?? '';
$aspectRatio = $input['aspectRatio'] ?? '16:9';
$creativeFreedom = floatval($input['creativeFreedom'] ?? 0.3);

// Camera physics data
$cameraPhysics = [
    'Arri Alexa 35' => 'ArriRaw sensor data, pleasing noise floor, high dynamic range, natural skin micro-texture',
    'Sony Venice 2' => 'Clean digital sensor, zero noise, high-frequency detail, modern sharpness',
    'Red V-Raptor' => '8K RedCode RAW, clinical detail, hyper-sharp edges, high shutter angle crispness',
    'Arriflex 416' => 'Kodak Vision3 500T film stock, heavy film grain, halation, soft organic edges, chemical color process',
    'Arricam LT' => 'Kodak Vision3 50D film stock, fine grain, organic resolution, rich photochemical colors',
    'Fujifilm GFX 100' => '100 Megapixel medium format sensor, pore-level skin detail, textile fiber detail, print quality resolution',
    'Phantom Flex4K' => 'High-speed sensor readout, frozen temporal resolution, saturated color depth, zero motion blur artifacts',
    'Blackmagic URSA Cine 12K' => '12K RGB pattern, infinite reframing capability, zero aliasing, analytics-grade edge definition'
];

// Lens physics data
$lensPhysics = [
    'Panavision C-Series' => 'anamorphic optics, characteristic oval bokeh, horizontal blue lens flares, slight barrel distortion',
    'Cooke S7/i' => 'Cooke speed panchrio look, warm color rendering, gentle focus falloff, flattering face compression',
    'Canon K-35' => 'vintage aspherical elements, glowing highlights, low contrast, rainbow flaring, soft sharpness',
    'Arri Signature' => 'telecentric optical design, zero breathing, ultra-flat field, modern rendering, pure black levels',
    'Zeiss Super Speed' => 'vintage high-speed glass, triangular bokeh at wide apertures, chromatic aberration, gritty texture',
    'Fujinon GF' => 'modern medium format optics, clinical edge-to-edge sharpness, zero distortion, high micro-contrast',
    'Laowa Probe' => 'macro bug-eye perspective, extreme depth of field, tubular lens construction, surreal wide-angle macro',
    'Helios 44-2' => 'Vintage Soviet glass, characteristic swirly bokeh at edges, low contrast flaring, soft center focus, dreamlike aberrations',
    'Canon TS-E' => 'Tilted focal plane, miniature faking effect, selective focus slice, corrected perspective lines, architectural rigidity',
    'Angénieux Optimo' => 'Cinema zoom optics, warm organic contrast, breathing-free focus pulls, uniform field illumination'
];

// Application lighting presets
$applicationLighting = [
    'Portrait Studio' => 'Rembrandt lighting, softbox diffusion, 3-point setup',
    'Corporate Headshot' => 'Clean white background, high-key lighting, professional balanced fill, sharp focus on eyes, moderate depth of field',
    'Product (Crisp)' => 'Infinity curve, bright diffuse lighting, shadowless, high key',
    'Food Photography' => 'Natural window light simulation, back-lighting for steam/texture, warm reflector fill, medium depth of field, focus on texture',
    'Macro: Luxury Jewelry' => 'Sparkling point-source lighting, black velvet background, high contrast reflection control, focus stacking simulation for complete sharpness',
    'Macro: Nature Details' => 'Diffused natural sunlight, shallow depth of field, vibrant greens, morning dew, microscopic texture',
    'Tech Commercial (Macro)' => 'Slow moving light sweep (motion control), brushed metal reflections, dramatic rim lighting in a black void, sub-surface scattering on materials',
    'Golden Hour (Outdoor)' => 'Sun low on horizon, warm orange glow, long dramatic shadows, volumetric backlight, magic hour atmosphere, cinematic depth',
    'Blue Hour (City)' => 'Twilight, deep blue ambient sky light contrasting with warm practical street lamps, moody, atmospheric, balanced exposure',
    'Wildlife / Safari' => 'Telephoto compression, frozen motion, golden hour backlight, natural habitat, separation from background',
    'Sports Action' => 'High shutter speed, frozen particles/sweat, stadium floodlights, dynamic composition, sharp subject focus',
    'Neon Cyberpunk' => 'Harsh neon signage, mixed color temp, wet reflections',
    'Nostalgic Memory' => 'Hazy atmosphere, overexposed highlights, light leaks, warm color grade, sentimental mood, soft focus throughout',
    'Cinematic Horror' => 'Underexposed, single harsh source (flashlight), heavy shadows',
    'Cassette Futurism (Retro Sci-Fi)' => 'Flickering CRT monitor glow, harsh overhead fluorescent strips, brutalist shadows, beige and grey color palette, industrial haze',
    'Surreal Infrared' => 'Full spectrum daylight, false color infrared shift (foliage turns pink/white), deep blue skies, high contrast, dreamlike atmosphere',
    'Spaghetti Western' => 'Harsh high-noon sun, heat haze distortion, sweaty skin texture, extreme close-up on eyes, deep depth of field',
    'Symmetrical Whimsy' => 'Shadowless high-key lighting, flat diorama aesthetic, vibrant pastel color palette, 90-degree planimetric composition',
    'IMAX Scale Epic' => 'Naturalistic practical lighting, cool color temperature, high contrast, immense sense of scale, deep depth of field',
    'Clinical Thriller' => 'Low-key chiaroscuro, controlled shadows, sickly green/yellow color grade, precise stabilized motion',
    'Brutalist Atmosphere' => 'Single source silhouette, atmospheric haze, monochromatic orange/sepia tones, stark geometry, visual silence',
    'Technicolor Dream' => 'Artificial studio lighting, high saturation, vibrant pinks and cyans, glossy plastic textures, high-key brightness',
    'Obsessive Symmetry' => 'One-point perspective, deep focus, wide angle distortion, cold practical lighting, clinical perfection',
    'Hong Kong Nostalgia' => 'Step-printing effect, motion blur, neon-soaked humidity, intimate handheld, rain-slicked textures',
    'Industrial Haze' => 'Volumetric lighting, visible shafts of light (god rays), atmospheric smoke, high-density industrial detail',
    'Gothic Fantasy' => 'German Expressionist lighting, high contrast long shadows, twisted geometry, desaturated palette',
    'LED Volume (Virtual Production)' => 'Interactive environmental lighting, soft ambient wrap from LED panels, perfect reflection matching, zero green spill',
    'Automotive: Showroom' => 'Massive softbox ceiling, continuous highlight lines along bodywork, negative fill to shape curves, pure white infinity cove',
    'Automotive: Process Trailer' => 'Dynamic passing street lights, rhythmic shadow movement, wet road reflections, motion blur on background only',
    'Product (Liquid/Splash)' => 'High-speed strobe lighting, frozen droplets, backlit fluid translucency, crystal clear refraction',
    'VFX / Green Screen' => 'Raw chromakey plate, perfectly flat shadowless green background, distinct rim light for separation, zero color spill, high-fidelity capture',
    'Knolling / Flat Lay' => 'Overhead soft diffuse light, shadowless cavity, high-key evenness, precise grid alignment',
    'NYC Street Editorial' => 'Natural city canyon light, bounce board fill for face, sharp modern contrast, motion blur in background, high-resolution gloss',
    '90s Grunge Editorial' => 'Hard direct flash, dirty green/yellow color cast, vignetting, unretouched skin texture, claustrophobic framing',
    'Fashion Editorial' => 'Avant-garde lighting, colored gels, stark shadows, high fashion pose, studio backdrop, stylized depth',
    'Underground Rave / Flash' => 'Direct on-camera flash with slow shutter drag (rear-curtain sync), light trails, laser rim lighting, sweaty atmosphere, darkness crushing the background',
    'Conflict Photography' => 'Harsh midday sun, atmospheric dust and smoke, high contrast, documentary style reality, blown highlights, raw and unpolished',
    'Street Photography' => 'Candid moment, natural available light, messy urban background, hyperfocal distance, deep depth of field, everything in focus',
    'Docu / Realism' => 'Natural window key light, negative fill, messy authentic background',
    'Architectural Digest Interior' => 'North-facing window soft light, large diffusion frames, negative fill for contrast, texture-raking angle, perfectly balanced exposure',
    'Architecture' => 'Balanced mixed lighting, straight lines, airy atmosphere',
    'Custom' => 'User-defined lighting setup'
];

// Aspect ratio prose
$aspectRatioProse = [
    '16:9' => 'A cinematic 16:9 composition featuring',
    '2.39:1' => 'A widescreen anamorphic-ratio composition featuring',
    '4:3' => 'A classic 4:3 format composition featuring',
    '1:1' => 'A square format composition featuring',
    '9:16' => 'A vertical full-screen composition featuring'
];

if (empty($sceneDescription)) {
    echo json_encode(['success' => false, 'error' => 'Scene description is required']);
    exit;
}

// Build the enhancement prompt for Gemini
$cameraPhysicsText = $cameraPhysics[$camera] ?? '';
$lensPhysicsText = $lensPhysics[$lens] ?? '';
$lighting = $applicationLighting[$application] ?? '';
$aspectText = $aspectRatioProse[$aspectRatio] ?? 'A composition featuring';

$enhancementPrompt = "You are an expert Cinematographer and Optical Physicist.
Your goal is to Create a \"Thick Description\" prompt that emphasizes TEXTURE, ATMOSPHERE, and LIGHT.

INPUT VARIABLES:
- Scene: {$sceneDescription}
- Application: {$application}
- Camera: {$camera}
- Lens: {$lens}
- Aspect Ratio Prose: {$aspectText}
- Creative Freedom: {$creativeFreedom}
- Camera Physics: {$cameraPhysicsText}
- Lens Physics: {$lensPhysicsText}
- Lighting: {$lighting}

EXECUTION STEPS:

1. **SMART FILL CHECK:**
   - IF input is short (less than 10 words) AND Creative Freedom is High (> 0.5):
     INVENT details based on Application.

2. **REALISM vs. STYLE CHECK:**
   - Application is {$application}

3. **SENSORY ENHANCEMENT (THE \"DEEP TEXTURE\" PASS):**
   - **Skin:** If humans are present, describe skin texture (e.g., \"visible pores,\" \"slight sweat sheen,\" \"natural imperfections\").
   - **Air:** Describe the air quality (e.g., \"humid haze,\" \"crisp winter air,\" \"dust motes in light beams\").
   - **Light:** Describe the *quality* of light (e.g., \"diffused window light,\" \"specular highlights\").
   - **Camera Sensor Physics:** Apply these characteristics: \"{$cameraPhysicsText}\"

4. **OPTICAL CHARACTERISTICS:**
   - **Lens Physics:** Apply these optical traits: \"{$lensPhysicsText}\"

5. **ASSEMBLY:**
   - Start with {$aspectText}
   - Expand subject with Smart Fill
   - Apply {$application} lighting defaults
   - Inject Camera Physics (Sensor/Film Stock characteristics)
   - Finish with Lens Physics (Optical characteristics)

OUTPUT FORMAT:
[Aspect Ratio Prose] + [Visual Subject] + [Sensory Atmosphere & Light] + [Camera Physics] + [Lens Physics].

STRICT OUTPUT FORMAT: Return ONLY the final visual description text. Do not use Markdown formatting. Do not include conversational filler like 'Here is your prompt' or 'Sure'.";

try {
    // Call Gemini API
    $apiUrl = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-3-flash-preview:generateContent?key=' . GEMINI_API_KEY;

    $requestData = [
        'contents' => [
            [
                'parts' => [
                    ['text' => $enhancementPrompt]
                ]
            ]
        ],
        'generationConfig' => [
            'temperature' => 0.7,
            'topK' => 40,
            'topP' => 0.95,
        ]
    ];

    $ch = curl_init($apiUrl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($requestData));

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    if ($httpCode !== 200) {
        throw new Exception("Gemini API error: HTTP $httpCode - $response");
    }

    $result = json_decode($response, true);

    if (!isset($result['candidates'][0]['content']['parts'][0]['text'])) {
        throw new Exception('Invalid response from Gemini API');
    }

    $enhancedPrompt = trim($result['candidates'][0]['content']['parts'][0]['text']);

    // Log to webhook
    try {
        $userEmail = $authStatus['user']['preferred_username'] ?? $authStatus['user']['email'] ?? 'anonymous@nano-banana-pro.com';
        $webhookSettings = [
            'sceneDescription' => $sceneDescription,
            'camera' => $camera,
            'lens' => $lens,
            'application' => $application,
            'aspectRatio' => $aspectRatio,
            'creativeFreedom' => $creativeFreedom
        ];

        logPromptEnhancement($sceneDescription, $enhancedPrompt, $webhookSettings, $userEmail);
    } catch (Exception $e) {
        // Don't fail if webhook fails
        error_log("Webhook logging failed in enhance_prompt: " . $e->getMessage());
    }

    echo json_encode([
        'success' => true,
        'enhancedPrompt' => $enhancedPrompt
    ]);

} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}