app.py

# app.py
import streamlit as st
from core.gemini_handler import GeminiHandler
from core.visual_engine import VisualEngine 
from core.prompt_engineering import (
    create_story_breakdown_prompt,
    create_image_prompt_from_scene_data,
    create_narration_script_prompt, # New
    create_scene_regeneration_prompt,
    create_visual_regeneration_prompt
)
import os

# --- Configuration & Initialization ---
st.set_page_config(page_title="CineGen AI Ultra", layout="wide", initial_sidebar_state="expanded")

# --- Global State Variables & API Key Setup ---
# Simplified API Key Loading
def load_api_key(key_name_streamlit, key_name_env):
    key = None
    try:
        if key_name_streamlit in st.secrets: key = st.secrets[key_name_streamlit]
    except AttributeError: print(f"st.secrets not available for {key_name_streamlit}.") # Local dev
    except Exception as e: print(f"Error accessing st.secrets for {key_name_streamlit}: {e}")
    if not key and key_name_env in os.environ: key = os.environ[key_name_env]
    return key

if 'GEMINI_API_KEY' not in st.session_state:
    st.session_state.GEMINI_API_KEY = load_api_key("GEMINI_API_KEY", "GEMINI_API_KEY")
    if not st.session_state.GEMINI_API_KEY: st.error("Gemini API Key missing!"); st.stop()
if 'gemini_handler' not in st.session_state:
    st.session_state.gemini_handler = GeminiHandler(api_key=st.session_state.GEMINI_API_KEY)

if 'visual_engine' not in st.session_state:
    st.session_state.visual_engine = VisualEngine(output_dir="temp_cinegen_media")
    st.session_state.visual_engine.set_openai_api_key(load_api_key("OPENAI_API_KEY", "OPENAI_API_KEY"))
    st.session_state.visual_engine.set_elevenlabs_api_key(load_api_key("ELEVENLABS_API_KEY", "ELEVENLABS_API_KEY"))
    st.session_state.visual_engine.set_pexels_api_key(load_api_key("PEXELS_API_KEY", "PEXELS_API_KEY"))

# Initialize other session state variables (same as before)
for key, default_val in [
    ('story_scenes', []), ('scene_image_prompts', []), ('generated_images_paths', []),
    ('video_path', None), ('character_definitions', {}), ('style_reference_description', ""),
    ('overall_narration_path', None), ('narration_script_for_display', "")
]:
    if key not in st.session_state: st.session_state[key] = default_val
# --- End State & API Key Setup ---


def initialize_new_story(): # Remains same
    st.session_state.story_scenes = []
    st.session_state.scene_image_prompts = []
    st.session_state.generated_images_paths = []
    st.session_state.video_path = None
    st.session_state.overall_narration_path = None
    st.session_state.narration_script_for_display = ""


def generate_visual_for_scene_wrapper(scene_index, scene_data, is_regeneration=False, version_count=1):
    # ... (This helper remains the same, but now `generate_image_visual` in engine has Pexels fallback) ...
    # Pass scene_data for Pexels query generation
    scene_num_for_log = scene_data.get('scene_number', scene_index + 1)
    textual_image_prompt = ""
    if is_regeneration and scene_index < len(st.session_state.scene_image_prompts) and st.session_state.scene_image_prompts[scene_index]:
        textual_image_prompt = st.session_state.scene_image_prompts[scene_index]
    else:
        textual_image_prompt = create_image_prompt_from_scene_data(
            scene_data, st.session_state.character_definitions, st.session_state.style_reference_description)
    if not textual_image_prompt: return False
    if scene_index >= len(st.session_state.scene_image_prompts):
        while len(st.session_state.scene_image_prompts) <= scene_index: st.session_state.scene_image_prompts.append("")
    st.session_state.scene_image_prompts[scene_index] = textual_image_prompt
    image_filename = f"scene_{scene_num_for_log}_visual_v{version_count}.png" # DALL-E saves as PNG
    
    # Pass scene_data to visual engine for Pexels query if DALL-E fails
    generated_image_path = st.session_state.visual_engine.generate_image_visual(
        textual_image_prompt, scene_data, image_filename 
    )
    while len(st.session_state.generated_images_paths) <= scene_index: st.session_state.generated_images_paths.append(None)
    if generated_image_path and os.path.exists(generated_image_path):
        st.session_state.generated_images_paths[scene_index] = generated_image_path; return True
    else:
        st.session_state.generated_images_paths[scene_index] = None; return False


# --- UI Sidebar ---
with st.sidebar:
    st.title("🎬 CineGen AI Ultra")
    st.markdown("### Creative Controls")
    # ... (user_idea, genre, mood, num_scenes - same) ...
    user_idea = st.text_area("Core story idea:", "A lone astronaut discovers a glowing alien artifact on Mars, a sense of wonder and slight dread.", height=100, key="user_idea_input")
    genre = st.selectbox("Genre:", ["Cyberpunk", "Sci-Fi", "Fantasy", "Noir", "Thriller"], index=0, key="genre_select")
    mood = st.selectbox("Mood:", ["Wonder", "Suspenseful", "Mysterious", "Gritty", "Epic"], index=0, key="mood_select")
    num_scenes_val = st.slider("Number of Scenes:", 1, 3, 1, key="num_scenes_slider")


    if st.button("🚀 Generate Cinematic Masterpiece", type="primary", key="generate_masterpiece_btn", use_container_width=True):
        initialize_new_story()
        if not user_idea.strip(): st.warning("Please enter a story idea.")
        else:
            with st.status("Crafting your cinematic vision...", expanded=True) as status_main:
                st.write("Phase 1: Gemini is drafting the script... 📜")
                # ... (Story generation - same) ...
                story_prompt_text = create_story_breakdown_prompt(user_idea, genre, mood, num_scenes_val)
                try:
                    st.session_state.story_scenes = st.session_state.gemini_handler.generate_story_breakdown(story_prompt_text)
                    status_main.update(label="Script complete! ✅ Generating visuals...", state="running")
                    num_actual_scenes = len(st.session_state.story_scenes)
                    st.session_state.scene_image_prompts = [""] * num_actual_scenes
                    st.session_state.generated_images_paths = [None] * num_actual_scenes
                except Exception as e: status_main.update(label=f"Script gen failed: {e}", state="error"); st.stop()
                
                if st.session_state.story_scenes:
                    st.write("Phase 2: Creating visuals (DALL-E/Pexels)... 🖼️")
                    visual_success_count = 0
                    for i, scene_data in enumerate(st.session_state.story_scenes):
                        st.write(f"  Processing Scene {scene_data.get('scene_number', i + 1)} visuals...")
                        if generate_visual_for_scene_wrapper(i, scene_data, version_count=1): visual_success_count +=1
                    
                    if visual_success_count == 0 : 
                        status_main.update(label="Visual gen failed for all scenes.", state="error", expanded=False); st.stop()
                    
                    st.write("Phase 3: Generating narration script with Gemini... 🎤")
                    narration_prompt = create_narration_script_prompt(st.session_state.story_scenes, mood, genre)
                    try:
                        narration_script = st.session_state.gemini_handler.generate_image_prompt(narration_prompt) # Re-use for text gen
                        st.session_state.narration_script_for_display = narration_script
                        status_main.update(label="Narration script ready! Generating voice...", state="running")
                        
                        st.write("Phase 4: Synthesizing voice with ElevenLabs... 🔊")
                        st.session_state.overall_narration_path = st.session_state.visual_engine.generate_narration_audio(
                            narration_script, "overall_narration.mp3"
                        )
                        if st.session_state.overall_narration_path:
                             status_main.update(label="Voiceover generated! ✨", state="running")
                        else:
                            status_main.update(label="Voiceover failed, proceeding without.", state="warning")
                    except Exception as e:
                        status_main.update(label=f"Narration/Voice gen failed: {e}", state="warning")

                    status_main.update(label="All major components generated! Storyboard ready. 🎉", state="complete", expanded=False)

    st.markdown("---") # Advanced Options (Character, Style - same as previous full app.py)
    # ... (Character Consistency expander - same)
    with st.expander("Character Consistency", expanded=False):
        char_name_input = st.text_input("Character Name (e.g., Jax)", key="char_name_adv_input")
        char_desc_input = st.text_area("Character Description (e.g., 'male astronaut, rugged, dark short hair, blue eyes, wearing a worn white and orange spacesuit with a cracked visor helmet slung at his hip')", key="char_desc_adv_input", height=120)
        if st.button("Add/Update Character", key="add_char_adv_btn"):
            if char_name_input and char_desc_input: st.session_state.character_definitions[char_name_input.strip().lower()] = char_desc_input.strip(); st.success(f"Character '{char_name_input.strip()}' defined.")
            else: st.warning("Provide both name and description.")
        if st.session_state.character_definitions:
            st.caption("Defined Characters:")
            for char_key, desc_val in st.session_state.character_definitions.items(): st.markdown(f"**{char_key.title()}:** _{desc_val}_")
    # ... (Style Controls expander - same)
    with st.expander("Style Controls", expanded=True):
        predefined_styles = { "Default (Cinematic Photorealism)": "", "Gritty Neo-Noir": "neo-noir aesthetic, gritty realism, deep shadows...", "Epic Fantasy Matte Painting": "epic fantasy matte painting style...", "Impressionistic Dream": "impressionistic oil painting style...", "Vintage Sci-Fi (70s/80s Film)": "retro sci-fi aesthetic, analog film look...", "Modern Anime Key Visual": "high-detail modern anime key visual style..." }
        selected_preset = st.selectbox("Base Style Preset:", options=list(predefined_styles.keys()), key="style_preset_select_adv")
        custom_keywords = st.text_area("Add Custom Style Keywords:", key="custom_style_keywords_adv_input", height=80, placeholder="e.g., 'Dutch angle, fisheye lens'")
        current_style_desc = st.session_state.style_reference_description
        if st.button("Apply & Set Styles", key="apply_styles_adv_btn"):
            final_desc = predefined_styles[selected_preset]; 
            if custom_keywords.strip(): final_desc = f"{final_desc}, {custom_keywords.strip()}" if final_desc else custom_keywords.strip()
            st.session_state.style_reference_description = final_desc.strip(); current_style_desc = final_desc.strip()
            if current_style_desc: st.success("Styles applied!")
            else: st.info("Default style (no specific additions).")
        if current_style_desc: st.caption(f"Active style additions: \"{current_style_desc}\"")
        else: st.caption("No specific style prompt additions active.")
    # Conceptual Voice selection for ElevenLabs
    with st.expander("Voice Customization (ElevenLabs)", expanded=False):
        # In a real app, you'd fetch voice list from ElevenLabs API if key is present
        available_voices_conceptual = ["Rachel", "Adam", "Bella", "Antoni", "Elli", "Josh", "Arnold", "Callum"]
        selected_voice = st.selectbox("Choose Narrator Voice:", available_voices_conceptual, 
                                      index=available_voices_conceptual.index(st.session_state.visual_engine.elevenlabs_voice_id) if st.session_state.visual_engine.elevenlabs_voice_id in available_voices_conceptual else 0,
                                      key="elevenlabs_voice_select")
        if st.button("Set Voice", key="set_voice_btn"):
            st.session_state.visual_engine.elevenlabs_voice_id = selected_voice
            st.success(f"Narrator voice set to: {selected_voice}")


# --- Main Content Area ---
# ... (Header, Scene Iteration, Details, Image Display, Edit Popovers - mostly the same as previous full app.py)
# Key change: Pass character_definitions and style_reference_description to create_visual_regeneration_prompt

st.header("📝 Cinematic Storyboard")
if st.session_state.narration_script_for_display: # Display narration script if generated
    with st.expander("View Generated Narration Script", expanded=False):
        st.markdown(st.session_state.narration_script_for_display)

if not st.session_state.story_scenes:
    st.info("Enter your idea in the sidebar and click '🚀 Generate Cinematic Masterpiece' to begin.")
else:
    for i, scene_data_display in enumerate(st.session_state.story_scenes):
        # ... (scene_num_display, unique_key_part, subheader, columns, Scene Details, Image Display - same as previous)
        scene_num_display = scene_data_display.get('scene_number', i + 1); action_summary = scene_data_display.get('key_action', f"scene{i}"); key_part_raw = ''.join(e for e in action_summary if e.isalnum() or e.isspace()); unique_key_part = key_part_raw.replace(" ", "_")[:20]
        st.subheader(f"Scene {scene_num_display}: {scene_data_display.get('emotional_beat', 'Untitled Scene')}")
        col1, col2 = st.columns([2, 3])
        with col1: 
            with st.expander("Scene Details", expanded=True):
                st.markdown(f"**Setting:** {scene_data_display.get('setting_description', 'N/A')}"); st.markdown(f"**Characters:** {', '.join(scene_data_display.get('characters_involved', []))}"); st.markdown(f"**Key Action:** {scene_data_display.get('key_action', 'N/A')}"); st.markdown(f"**Dialogue Snippet:** `\"{scene_data_display.get('dialogue_snippet', '...')}\"`"); st.markdown(f"**Visual Style Suggestion (Gemini):** {scene_data_display.get('visual_style_suggestion', 'N/A')}"); st.markdown(f"**Camera Suggestion (Gemini):** {scene_data_display.get('camera_angle_suggestion', 'N/A')}")
                current_textual_prompt = st.session_state.scene_image_prompts[i] if i < len(st.session_state.scene_image_prompts) else None
                if current_textual_prompt:
                     with st.popover("View Full Image Prompt"): st.markdown(f"**Full Textual Prompt Sent to DALL-E:**"); st.code(current_textual_prompt, language='text')
        with col2: 
            current_image_path = st.session_state.generated_images_paths[i] if i < len(st.session_state.generated_images_paths) else None
            if current_image_path and os.path.exists(current_image_path): st.image(current_image_path, caption=f"Visual Concept for Scene {scene_num_display}") 
            else:
                if st.session_state.story_scenes: st.caption("Visual for this scene is pending or failed.")
            with st.popover(f"✏️ Edit Scene {scene_num_display} Script"): 
                # ... (Script edit logic - same, but uses updated generate_visual_for_scene_wrapper)
                feedback_script = st.text_area("Describe script changes:", key=f"script_feedback_{unique_key_part}_{i}", height=100) 
                if st.button(f"🔄 Update Scene {scene_num_display} Script", key=f"regen_script_btn_{unique_key_part}_{i}"): 
                    if feedback_script:
                        with st.status(f"Updating Scene {scene_num_display}...", expanded=True) as status_script_regen:
                            regen_prompt = create_scene_regeneration_prompt(scene_data_display, feedback_script, st.session_state.story_scenes)
                            try:
                                updated_scene_data = st.session_state.gemini_handler.regenerate_scene_script_details(regen_prompt); st.session_state.story_scenes[i] = updated_scene_data 
                                status_script_regen.update(label="Script updated! Regenerating visual...", state="running")
                                version = 1
                                if current_image_path: try: base, _ = os.path.splitext(os.path.basename(current_image_path)); version = int(base.split('_v')[-1]) + 1 if '_v' in base else 2 except: version = 2
                                if generate_visual_for_scene_wrapper(i, updated_scene_data, is_regeneration=False, version_count=version): status_script_regen.update(label="Scene script & visual updated! 🎉", state="complete", expanded=False)
                                else: status_script_regen.update(label="Script updated, visual failed.", state="warning", expanded=False)
                                st.rerun()
                            except Exception as e: status_script_regen.update(label=f"Error: {e}", state="error")
                    else: st.warning("Please provide feedback.")
            with st.popover(f"🎨 Edit Scene {scene_num_display} Visuals"): 
                # ... (Visual edit logic - same, but passes more context to create_visual_regeneration_prompt)
                prompt_for_edit_visuals = st.session_state.scene_image_prompts[i] if i < len(st.session_state.scene_image_prompts) else "No prompt."
                st.caption("Current Full Image Prompt:"); st.code(prompt_for_edit_visuals, language='text')
                feedback_visual = st.text_area("Describe visual changes for the prompt:", key=f"visual_feedback_{unique_key_part}_{i}", height=100) 
                if st.button(f"🔄 Update Scene {scene_num_display} Visuals", key=f"regen_visual_btn_{unique_key_part}_{i}"): 
                    if feedback_visual:
                        with st.status(f"Refining prompt & regenerating visual...", expanded=True) as status_visual_regen:
                            prompt_refinement_request = create_visual_regeneration_prompt(
                                prompt_for_edit_visuals, feedback_visual, scene_data_display, 
                                st.session_state.character_definitions, st.session_state.style_reference_description # Pass these
                            )
                            try:
                                refined_textual_image_prompt = st.session_state.gemini_handler.regenerate_image_prompt_from_feedback(prompt_refinement_request)
                                st.session_state.scene_image_prompts[i] = refined_textual_image_prompt 
                                status_visual_regen.update(label="Prompt refined! Regenerating visual...", state="running")
                                version = 1
                                if current_image_path: try: base, _ = os.path.splitext(os.path.basename(current_image_path)); version = int(base.split('_v')[-1]) + 1 if '_v' in base else 2 except: version = 2
                                if generate_visual_for_scene_wrapper(i, scene_data_display, is_regeneration=True, version_count=version): status_visual_regen.update(label="Visual updated! 🎉", state="complete", expanded=False)
                                else: status_visual_regen.update(label="Prompt refined, visual failed.", state="warning", expanded=False)
                                st.rerun()
                            except Exception as e: status_visual_regen.update(label=f"Error: {e}", state="error")
                    else: st.warning("Please provide feedback.")
        st.markdown("---")
    
    # Video Generation - Pass overall_narration_path
    if st.session_state.story_scenes and any(p for p in st.session_state.generated_images_paths if p is not None):
        if st.button("🎬 Assemble Narrated Masterpiece", key="assemble_narrated_video_btn", type="primary", use_container_width=True):
            with st.status("Assembling narrated animatic video...", expanded=True) as status_video:
                image_data_for_video = []
                # ... (image_data_for_video assembly - same) ...
                for idx, scene_info in enumerate(st.session_state.story_scenes):
                    img_path = st.session_state.generated_images_paths[idx] if idx < len(st.session_state.generated_images_paths) else None
                    if img_path and os.path.exists(img_path):
                        image_data_for_video.append({'path':img_path, 'scene_num':scene_info.get('scene_number',idx+1), 'key_action':scene_info.get('key_action','')})
                        st.write(f"Adding Scene {scene_info.get('scene_number', idx + 1)} to video.")
                
                if image_data_for_video:
                    st.write("Calling video engine (with narration if available)...")
                    st.session_state.video_path = st.session_state.visual_engine.create_video_from_images(
                        image_data_for_video, 
                        overall_narration_path=st.session_state.overall_narration_path, # Pass narration
                        output_filename="cinegen_narrated_masterpiece.mp4",
                        duration_per_image=5, # Longer for narration
                        fps=24 
                    )
                    if st.session_state.video_path and os.path.exists(st.session_state.video_path):
                        status_video.update(label="Narrated masterpiece assembled! 🎉", state="complete", expanded=False); st.balloons()
                    else: status_video.update(label="Video assembly failed. Check logs.", state="error", expanded=False)
                else: status_video.update(label="No valid images to assemble video.", state="error", expanded=False)
    elif st.session_state.story_scenes: st.info("Generate visuals for scenes before assembling the video.")

    # Video display and download - (same)
    if st.session_state.video_path and os.path.exists(st.session_state.video_path):
        st.header("🎬 Generated Narrated Masterpiece")
        try:
            with open(st.session_state.video_path, 'rb') as vf_obj: video_bytes = vf_obj.read()
            st.video(video_bytes, format="video/mp4") 
            with open(st.session_state.video_path, "rb") as fp_dl:
                st.download_button(label="Download Narrated Masterpiece", data=fp_dl,
                    file_name=os.path.basename(st.session_state.video_path), mime="video/mp4",
                    use_container_width=True, key="download_narrated_video_btn" )
        except Exception as e: st.error(f"Error displaying video: {e}")

# --- Footer ---
st.sidebar.markdown("---")
st.sidebar.caption("CineGen AI Ultra | Powered by Gemini, DALL-E, ElevenLabs & Streamlit.")