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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <title>Pro Video Prompt Workspace</title>
    <!-- Tailwind CSS -->
    <script src="https://cdn.tailwindcss.com"></script>
    <!-- Lucide Icons -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/lucide/0.460.0/umd/lucide.min.js"></script>
    <style>
        /* Forces Android Webviews to allow long-press context menus */
        .allow-long-press {
            -webkit-touch-callout: default !important;
            user-select: auto !important;
        }
    </style>
</head>
<body class="min-h-screen bg-neutral-950 text-neutral-100 p-4 md:p-8 font-sans pb-24">
    <div class="max-w-5xl mx-auto space-y-6">
        
        <!-- Header -->
        <header class="flex flex-col md:flex-row md:items-center justify-between gap-4 border-b border-neutral-800 pb-4">
            <div class="flex items-center gap-3">
                <i data-lucide="clapperboard" class="w-8 h-8 text-blue-400"></i>
                <div>
                    <h1 class="text-2xl font-bold tracking-tight text-white">Google Flow & Veo 3.1 Workspace</h1>
                    <p class="text-neutral-400 text-sm">Pro-Level Prompt Engineering & Asset Generator</p>
                </div>
            </div>
            <div class="flex flex-col gap-1 w-full md:w-72">
                <label class="text-xs font-medium text-neutral-400">Gemini API Key (Required for hosting)</label>
                <input 
                    type="password" 
                    id="customApiKey"
                    placeholder="Paste key here..."
                    class="w-full bg-black border border-neutral-700 rounded p-2 text-sm text-neutral-200 outline-none focus:border-blue-500"
                />
            </div>
        </header>

        <!-- Controls Section -->
        <div class="grid md:grid-cols-3 gap-6">
            <div class="md:col-span-2 space-y-4 bg-neutral-900 p-5 rounded-xl border border-neutral-800 shadow-xl">
                <div>
                    <label class="block text-sm font-medium text-neutral-300 mb-2">Scene Concept</label>
                    <textarea 
                        id="conceptInput"
                        placeholder="e.g., A macro shot of a dewdrop falling from a lush green fern leaf in a dense rainforest..."
                        class="w-full h-28 bg-black border border-neutral-700 rounded-lg p-3 text-neutral-100 focus:ring-2 focus:ring-blue-500 focus:border-transparent outline-none resize-none"
                    ></textarea>
                </div>
                
                <div class="flex flex-wrap items-center gap-6">
                    <div>
                        <label class="block text-sm font-medium text-neutral-300 mb-2">Total Segments (8s each)</label>
                        <div class="flex items-center gap-3">
                            <input 
                                type="range" 
                                id="segmentsInput"
                                min="1" max="5" 
                                value="1"
                                class="w-32 accent-blue-500"
                            />
                            <span id="segmentsDisplay" class="font-mono bg-black border border-neutral-800 px-2 py-1 rounded text-sm text-blue-400">
                                1 (8s total)
                            </span>
                        </div>
                    </div>

                    <label class="flex items-center gap-2 cursor-pointer mt-4 md:mt-0">
                        <input 
                            type="checkbox" 
                            id="realisticToggle"
                            checked
                            class="w-4 h-4 rounded text-blue-500 bg-black border-neutral-700 focus:ring-blue-500"
                        />
                        <span class="text-sm font-medium text-neutral-300">Apply True-to-Life Tags</span>
                    </label>
                </div>

                <!-- Customization Fields -->
                <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mt-4 pt-4 border-t border-neutral-800">
                    <div>
                        <label class="block text-xs font-medium text-neutral-400 mb-1">Bookend Start Motion</label>
                        <input type="text" id="startMotion" value="Slow tracking shot moving forward" class="w-full bg-black border border-neutral-700 rounded p-2 text-sm text-neutral-200 outline-none focus:border-blue-500" />
                    </div>
                    <div>
                        <label class="block text-xs font-medium text-neutral-400 mb-1">Bookend End Motion</label>
                        <input type="text" id="endMotion" value="Camera settles into a static, locked-off composition" class="w-full bg-black border border-neutral-700 rounded p-2 text-sm text-neutral-200 outline-none focus:border-blue-500" />
                    </div>
                </div>
                
                <div id="tagsContainer" class="space-y-3 mt-4 pt-4 border-t border-neutral-800">
                    <div>
                        <label class="block text-xs font-medium text-neutral-400 mb-1">True-to-Life Meta Tags</label>
                        <textarea id="metaTags" class="w-full h-16 bg-black border border-neutral-700 rounded p-2 text-xs text-neutral-300 outline-none focus:border-blue-500 resize-none">8k resolution, photorealistic, cinematic lighting, national geographic style, highly detailed, sharp focus, true-to-life, nature photography, real life, masterpiece, pro-level cinematography</textarea>
                    </div>
                    <div>
                        <label class="block text-xs font-medium text-neutral-400 mb-1">Standard Negative Prompts</label>
                        <textarea id="negativeTags" class="w-full h-16 bg-black border border-neutral-700 rounded p-2 text-xs text-neutral-300 outline-none focus:border-blue-500 resize-none">cartoon, 3d render, animation, low quality, blurry, distorted, deformed, artificial lighting, text, watermark, CGI, painting, illustration</textarea>
                    </div>
                </div>
            </div>

            <!-- Checklist Sidebar -->
            <div class="space-y-4 bg-neutral-900 p-5 rounded-xl border border-neutral-800 shadow-xl">
                <h3 class="font-semibold text-lg flex items-center gap-2 border-b border-neutral-800 pb-2 text-white">
                    <i data-lucide="settings" class="w-5 h-5 text-purple-400"></i> Pro Workflow
                </h3>
                <ul class="space-y-3 text-sm text-neutral-300">
                    <li class="flex items-start gap-2"><i data-lucide="film" class="w-4 h-4 text-emerald-400 mt-0.5 shrink-0"></i> Apply Bookend Strategy</li>
                    <li class="flex items-start gap-2"><i data-lucide="video" class="w-4 h-4 text-emerald-400 mt-0.5 shrink-0"></i> Format into 8s outputs</li>
                    <li class="flex items-start gap-2"><i data-lucide="image" class="w-4 h-4 text-blue-400 mt-0.5 shrink-0"></i> Generate First Frame per segment</li>
                    <li class="flex items-start gap-2"><i data-lucide="image" class="w-4 h-4 text-blue-400 mt-0.5 shrink-0"></i> Generate Last Frame per segment</li>
                    <li class="flex items-start gap-2"><i data-lucide="image" class="w-4 h-4 text-blue-400 mt-0.5 shrink-0"></i> Generate Ingredients</li>
                </ul>
            </div>
        </div>

        <!-- Generated Workspace Blocks -->
        <div class="space-y-6 pt-4">
            <h2 class="text-xl font-bold flex items-center gap-2 text-white">
                <i data-lucide="video" class="w-6 h-6 text-blue-400"></i> Generated Workspace Blocks
            </h2>
            <div id="segmentsContainer" class="space-y-6">
                <!-- Dynamically populated -->
            </div>
        </div>
    </div>

    <!-- Export Hub Overlay -->
    <div id="exportModal" class="hidden fixed inset-0 z-50 flex-col items-center justify-center bg-black/95 p-4 backdrop-blur-md transition-all">
        <div class="bg-neutral-900 border border-neutral-800 p-5 rounded-2xl max-w-sm w-full shadow-2xl">
            <div class="flex justify-between items-center mb-4 border-b border-neutral-800 pb-3">
                <h3 class="font-bold text-white flex items-center gap-2">
                    <i data-lucide="download-cloud" class="w-5 h-5 text-blue-400"></i> Export Hub
                </h3>
                <button data-action="close-export" class="text-neutral-400 hover:text-white p-1">
                    <i data-lucide="x" class="w-5 h-5"></i>
                </button>
            </div>

            <div class="bg-black rounded-lg p-2 mb-4">
                <img id="exportModalImage" src="" alt="Asset to export" class="w-full h-auto rounded pointer-events-auto select-auto allow-long-press" />
                <p class="text-center text-[10px] text-neutral-500 mt-2">
                    💡 Try long-pressing the image above to save
                </p>
            </div>

            <div class="space-y-3">
                <button data-action="export-copy" class="w-full flex items-center justify-center gap-2 bg-blue-600 hover:bg-blue-500 text-white px-4 py-3 rounded-xl font-medium transition-colors shadow-lg">
                    <i data-lucide="clipboard-copy" class="w-4 h-4"></i> Copy Image to Clipboard
                </button>
                <button data-action="export-share" class="w-full flex items-center justify-center gap-2 bg-neutral-800 hover:bg-neutral-700 border border-neutral-700 text-white px-4 py-3 rounded-xl font-medium transition-colors">
                    <i data-lucide="share-2" class="w-4 h-4"></i> Force Native Share
                </button>
                <button data-action="export-download" class="w-full flex items-center justify-center gap-2 bg-neutral-800 hover:bg-neutral-700 border border-neutral-700 text-white px-4 py-3 rounded-xl font-medium transition-colors">
                    <i data-lucide="download-cloud" class="w-4 h-4"></i> Fallback Download
                </button>
            </div>

            <div id="exportStatus" class="hidden mt-4 text-center text-sm font-medium text-emerald-400 bg-emerald-400/10 py-2 rounded-lg"></div>
        </div>
    </div>

    <!-- Application Logic -->
    <script>
        window.App = {
            state: {
                concept: '',
                segments: 1,
                isRealistic: true,
                customApiKey: '',
                startMotion: 'Slow tracking shot moving forward',
                endMotion: 'Camera settles into a static, locked-off composition',
                tags: "8k resolution, photorealistic, cinematic lighting, national geographic style, highly detailed, sharp focus, true-to-life, nature photography, real life, masterpiece, pro-level cinematography",
                negativeTags: "cartoon, 3d render, animation, low quality, blurry, distorted, deformed, artificial lighting, text, watermark, CGI, painting, illustration",
                images: {}, 
                exportData: null 
            },

            refreshIcons() {
                if (typeof lucide !== 'undefined') {
                    try { lucide.createIcons(); } catch (e) { console.warn("Icon render skipped"); }
                }
            },

            init() {
                // Bind inputs
                document.getElementById('conceptInput').addEventListener('input', (e) => { this.state.concept = e.target.value; this.renderSegments(); });
                document.getElementById('segmentsInput').addEventListener('input', (e) => { this.state.segments = parseInt(e.target.value); document.getElementById('segmentsDisplay').innerText = `${this.state.segments} (${this.state.segments * 8}s total)`; this.renderSegments(); });
                document.getElementById('realisticToggle').addEventListener('change', (e) => { this.state.isRealistic = e.target.checked; document.getElementById('tagsContainer').style.display = this.state.isRealistic ? 'block' : 'none'; this.renderSegments(); });
                document.getElementById('startMotion').addEventListener('input', (e) => { this.state.startMotion = e.target.value; this.renderSegments(); });
                document.getElementById('endMotion').addEventListener('input', (e) => { this.state.endMotion = e.target.value; this.renderSegments(); });
                document.getElementById('metaTags').addEventListener('input', (e) => { this.state.tags = e.target.value; this.renderSegments(); });
                document.getElementById('negativeTags').addEventListener('input', (e) => { this.state.negativeTags = e.target.value; this.renderSegments(); });
                document.getElementById('customApiKey').addEventListener('input', (e) => { this.state.customApiKey = e.target.value; });

                // BYPASS BROWSER PROTECTION: Global Event Delegation (No inline onclick handlers!)
                document.addEventListener('click', (e) => {
                    const btn = e.target.closest('[data-action]');
                    if (!btn) return;
                    
                    const action = btn.dataset.action;
                    const segmentNum = btn.dataset.segment ? parseInt(btn.dataset.segment) : null;
                    const type = btn.dataset.type;

                    if (action === 'copy-prompt') {
                        const text = this.generatePromptText(segmentNum);
                        this.copyToClipboard(text, btn.id);
                    } else if (action === 'generate-image') {
                        this.triggerGenerate(segmentNum, type);
                    } else if (action === 'open-export') {
                        const stateKey = `${segmentNum}-${type}`;
                        const imgState = this.state.images[stateKey];
                        if (imgState && imgState.data) {
                            this.openExportModal(imgState.data, segmentNum, type);
                        }
                    } else if (action === 'close-export') {
                        this.closeExportModal();
                    } else if (action === 'export-copy') {
                        this.executeCopyImage();
                    } else if (action === 'export-share') {
                        this.executeShare();
                    } else if (action === 'export-download') {
                        this.executeDownload();
                    }
                });

                this.renderSegments();
            },

            generatePromptText(segmentNum) {
                const baseConcept = this.state.concept || "[Enter your scene concept here]";
                let promptText = `Segment ${segmentNum} (8 Seconds):\nScene: ${baseConcept}\n`;
                if (this.state.isRealistic) {
                    promptText += `Meta Tags: ${this.state.tags}\nNegative Prompts: ${this.state.negativeTags}\n`;
                }
                if (segmentNum === 1) promptText += `\nCamera/Motion (Start): ${this.state.startMotion}`;
                else if (segmentNum === this.state.segments && this.state.segments > 1) promptText += `\nCamera/Motion (End): ${this.state.endMotion}`;
                else promptText += `\nCamera/Motion: Continuous flowing motion maintaining subject focus`;
                promptText += `\n\n[Workflow Note: Generate 3 Images for this segment (First Frame, Last Frame, Ingredient)]`;
                return promptText;
            },

            copyToClipboard(text, btnId) {
                const textArea = document.createElement("textarea");
                textArea.value = text;
                textArea.style.position = "fixed";
                textArea.style.left = "-999999px";
                document.body.appendChild(textArea);
                textArea.focus();
                textArea.select();
                try {
                    document.execCommand('copy');
                    const btn = document.getElementById(btnId);
                    const originalHTML = btn.innerHTML;
                    btn.innerHTML = `<i data-lucide="check-circle" class="w-3.5 h-3.5 text-emerald-400"></i> Copied Block`;
                    this.refreshIcons();
                    setTimeout(() => { btn.innerHTML = originalHTML; this.refreshIcons(); }, 2000);
                } catch (err) {
                    console.error('Failed to copy', err);
                }
                document.body.removeChild(textArea);
            },

            async fetchWithRetry(url, options, retries = 5) {
                const delays = [1000, 2000, 4000, 8000, 16000];
                for (let i = 0; i < retries; i++) {
                    try {
                        const res = await fetch(url, options);
                        if (res.ok) return res;
                        if (res.status === 400 || res.status === 403 || res.status === 401) {
                            const errData = await res.json().catch(() => ({}));
                            throw new Error(errData?.error?.message || `API Error: ${res.status}`);
                        }
                        if (i === retries - 1) throw new Error(`Status: ${res.status}`);
                    } catch (err) {
                        if (err.message.includes("API Error") || i === retries - 1) throw err;
                    }
                    await new Promise(resolve => setTimeout(resolve, delays[i]));
                }
            },

            async triggerGenerate(segmentNum, type) {
                if (!this.state.concept.trim()) {
                    this.setImageState(segmentNum, type, 'error', null, "Please type your idea in the box at the top first!");
                    const input = document.getElementById('conceptInput');
                    input.focus();
                    input.scrollIntoView({ behavior: 'smooth', block: 'center' });
                    return;
                }

                this.setImageState(segmentNum, type, 'loading');

                try {
                    const apiKey = this.state.customApiKey.trim();
                    if (!apiKey) throw new Error("Please paste your Google AI Studio API Key in the top right box to generate images.");

                    const url = `https://generativelanguage.googleapis.com/v1beta/models/imagen-4.0-generate-001:predict?key=${apiKey}`;
                    
                    let imgPrompt = this.state.concept;
                    if (type === 'First Frame') imgPrompt += ` - establishing shot.`;
                    if (type === 'Last Frame') imgPrompt += ` - final ending frame composition.`;
                    if (type === 'Ingredient') imgPrompt += ` - isolated core subject ingredient shot.`;
                    if (this.state.isRealistic) imgPrompt += `, ${this.state.tags}`;

                    const payload = { instances: { prompt: imgPrompt }, parameters: { sampleCount: 1 } };
                    
                    const response = await this.fetchWithRetry(url, {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json' },
                        body: JSON.stringify(payload)
                    });

                    const data = await response.json();
                    const base64Data = data.predictions?.[0]?.bytesBase64Encoded;
                    if (!base64Data) throw new Error("No image generated. Please try again.");

                    this.setImageState(segmentNum, type, 'success', `data:image/png;base64,${base64Data}`);
                } catch (err) {
                    console.error(err);
                    this.setImageState(segmentNum, type, 'error', null, err.message || "Failed to generate image.");
                }
            },