app.py

import streamlit as st
import tempfile
import os
import logging
from pathlib import Path
from PIL import Image
import io
import numpy as np
import sys
import subprocess
import json
from pygments import highlight
from pygments.lexers import PythonLexer
from pygments.formatters import HtmlFormatter
import base64
import re
import shutil
import time
from datetime import datetime, timedelta
import streamlit.components.v1 as components
import uuid
import pandas as pd
import plotly.express as px
import markdown
import zipfile
from azure.ai.inference import ChatCompletionsClient
from azure.ai.inference.models import SystemMessage, UserMessage
from azure.core.credentials import AzureKeyCredential
from openai import OpenAI
from transformers import pipeline
import torch
import traceback

# ──────────────────────────────────────────────────────────────────────────────
# Logging
# ──────────────────────────────────────────────────────────────────────────────
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s • %(name)s • %(levelname)s • %(message)s",
    handlers=[logging.StreamHandler()]
)
logger = logging.getLogger(__name__)

# ──────────────────────────────────────────────────────────────────────────────
# Model & Render Configuration
# ──────────────────────────────────────────────────────────────────────────────
MODEL_CONFIGS = {
    "DeepSeek-V3-0324": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "DeepSeek", "warning": None},
    "DeepSeek-R1": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "DeepSeek", "warning": None},
    "Llama-4-Scout-17B-16E-Instruct": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "Meta", "warning": None},
    "Llama-4-Maverick-17B-128E-Instruct-FP8": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "Meta", "warning": None},
    "gpt-4o-mini": {"max_tokens": 15000, "param_name": "max_tokens", "api_version": None, "category": "OpenAI", "warning": None},
    "gpt-4o": {"max_tokens": 16000, "param_name": "max_tokens", "api_version": None, "category": "OpenAI", "warning": None},
    "gpt-4.1": {"max_tokens": 32768, "param_name": "max_tokens", "api_version": None, "category": "OpenAI", "warning": None},
    "gpt-4.1-mini": {"max_tokens": 32768, "param_name": "max_tokens", "api_version": None, "category": "OpenAI", "warning": None},
    "gpt-4.1-nano": {"max_tokens": 32768, "param_name": "max_tokens", "api_version": None, "category": "OpenAI", "warning": None},
    "o3-mini": {"max_completion_tokens": 100000, "param_name": "max_completion_tokens", "api_version": "2024-12-01-preview", "category": "OpenAI", "warning": None},
    "o1": {"max_completion_tokens": 100000, "param_name": "max_completion_tokens", "api_version": "2024-12-01-preview", "category": "OpenAI", "warning": None},
    "o1-mini": {"max_completion_tokens": 66000, "param_name": "max_completion_tokens", "api_version": "2024-12-01-preview", "category": "OpenAI", "warning": None},
    "o1-preview": {"max_tokens": 33000, "param_name": "max_tokens", "api_version": None, "category": "OpenAI", "warning": None},
    "Phi-4-multimodal-instruct": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "Microsoft", "warning": None},
    "Mistral-large-2407": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "Mistral", "warning": None},
    "Codestral-2501": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "Mistral", "warning": None},
    "default": {"max_tokens": 4000, "param_name": "max_tokens", "api_version": None, "category": "Other", "warning": None}
}

QUALITY_PRESETS = {
    "480p": {"flag": "-ql", "fps": 30},
    "720p": {"flag": "-qm", "fps": 30},
    "1080p": {"flag": "-qh", "fps": 60},
    "4K":   {"flag": "-qk", "fps": 60},
    "8K":   {"flag": "-qp", "fps": 60},
}

ANIMATION_SPEEDS = {
    "Slow":      0.5,
    "Normal":    1.0,
    "Fast":      2.0,
    "Very Fast": 3.0
}

EXPORT_FORMATS = {
    "MP4 Video":       "mp4",
    "GIF Animation":   "gif",
    "WebM Video":      "webm",
    "PNG Sequence":    "png_sequence",
    "SVG":             "svg"
}

# ──────────────────────────────────────────────────────────────────────────────
# 1. prepare_api_params
# ──────────────────────────────────────────────────────────────────────────────
def prepare_api_params(messages, model_name):
    """Lookup MODEL_CONFIGS and build API call parameters."""
    config = MODEL_CONFIGS.get(model_name, MODEL_CONFIGS["default"])
    params = {
        "messages": messages,
        "model": model_name,
        config["param_name"]: config.get(config["param_name"])
    }
    return params, config

# ──────────────────────────────────────────────────────────────────────────────
# 2. get_secret
# ──────────────────────────────────────────────────────────────────────────────
def get_secret(key):
    """Read an environment variable (e.g. password, API token)."""
    val = os.environ.get(key)
    if not val:
        logger.warning(f"Secret '{key}' not found")
    return val or ""

# ──────────────────────────────────────────────────────────────────────────────
# 3. check_password
# ──────────────────────────────────────────────────────────────────────────────
def check_password():
    """Prompt for admin password and gate AI features."""
    correct = get_secret("password")
    if not correct:
        st.error("Admin password not configured in secrets")
        return False
    if "auth_ok" not in st.session_state:
        st.session_state.auth_ok = False
    if not st.session_state.auth_ok:
        pwd = st.text_input("🔒 Enter admin password", type="password", help="Protects AI assistant")
        if pwd:
            if pwd == correct:
                st.session_state.auth_ok = True
                st.success("Access granted")
            else:
                st.error("Incorrect password")
        return False
    return True

# ──────────────────────────────────────────────────────────────────────────────
# 4. ensure_packages
# ──────────────────────────────────────────────────────────────────────────────
def ensure_packages():
    """Check & install core dependencies on first run."""
    required = {
        'streamlit':'1.25.0','manim':'0.17.3','numpy':'1.22.0','Pillow':'9.0.0',
        'transformers':'4.30.0','torch':'2.0.0','plotly':'5.14.0','pandas':'2.0.0',
        'python-pptx':'0.6.21','markdown':'3.4.3','fpdf':'1.7.2','matplotlib':'3.5.0',
        'seaborn':'0.11.2','scipy':'1.7.3','huggingface_hub':'0.16.0',
        'azure-ai-inference':'1.0.0b9','azure-core':'1.33.0','openai':''
    }
    missing = []
    for pkg, ver in required.items():
        try:
            __import__(pkg if pkg!='Pillow' else 'PIL')
        except ImportError:
            missing.append(f"{pkg}>={ver}" if ver else pkg)
    if missing:
        st.sidebar.info("Installing required packages...")
        prog = st.sidebar.progress(0)
        for i, pkg in enumerate(missing, 1):
            subprocess.run([sys.executable, "-m", "pip", "install", pkg], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
            prog.progress(i/len(missing))
        st.sidebar.success("All packages installed")

# ──────────────────────────────────────────────────────────────────────────────
# 5. install_custom_packages
# ──────────────────────────────────────────────────────────────────────────────
def install_custom_packages(package_list):
    """Install user-specified pip packages on the fly."""
    packages = [p.strip() for p in package_list.split(",") if p.strip()]
    if not packages:
        return True, "No packages specified"
    results = []
    success = True
    for pkg in packages:
        res = subprocess.run([sys.executable, "-m", "pip", "install", pkg], capture_output=True, text=True)
        ok = (res.returncode == 0)
        results.append(f"{pkg}: {'✅' if ok else '❌'}")
        if not ok: success = False
    return success, "\n".join(results)

# ──────────────────────────────────────────────────────────────────────────────
# 6. init_ai_models_direct
# ──────────────────────────────────────────────────────────────────────────────
@st.cache_resource(ttl=3600)
def init_ai_models_direct():
    """Initialize Azure ChatCompletionsClient for AI code generation."""
    token = get_secret("github_token_api")
    if not token:
        st.error("GitHub token not found in secrets")
        return None
    endpoint = "https://models.inference.ai.azure.com"
    client = ChatCompletionsClient(endpoint=endpoint, credential=AzureKeyCredential(token))
    return {"client": client, "model_name": "gpt-4o", "endpoint": endpoint}

# ──────────────────────────────────────────────────────────────────────────────
# 7. suggest_code_completion
# ──────────────────────────────────────────────────────────────────────────────
def suggest_code_completion(code_snippet, models):
    """Use the initialized AI model to generate complete Manim code."""
    if not models:
        st.error("AI models not initialized")
        return None
    prompt = f"""Write a complete Manim animation scene based on this code or idea:
{code_snippet}

The code should include:
- A Scene subclass
- self.play() animations
- wait times
Return only valid Python code.
"""
    config = MODEL_CONFIGS.get(models["model_name"].split("/")[-1], MODEL_CONFIGS["default"])
    if config["category"] == "OpenAI":
        client = models.get("openai_client") or OpenAI(base_url="https://models.github.ai/inference", api_key=get_secret("github_token_api"))
        models["openai_client"] = client
        messages = [{"role":"developer","content":"Expert in Manim."}, {"role":"user","content":prompt}]
        params = {"messages": messages, "model": models["model_name"], config["param_name"]: config.get(config["param_name"])}
        resp = client.chat.completions.create(**params)
        content = resp.choices[0].message.content
    else:
        client = models["client"]
        msgs = [UserMessage(prompt)]
        params, _ = prepare_api_params(msgs, models["model_name"])
        resp = client.complete(**params)
        content = resp.choices[0].message.content
    # extract code block
    if "```python" in content:
        content = content.split("```python")[1].split("```")[0]
    elif "```" in content:
        content = content.split("```")[1].split("```")[0]
    if "class" not in content:
        content = f"from manim import *\n\nclass MyScene(Scene):\n    def construct(self):\n        {content}"
    return content

# ──────────────────────────────────────────────────────────────────────────────
# 8. check_model_freshness
# ──────────────────────────────────────────────────────────────────────────────
def check_model_freshness():
    """Return True if AI client was loaded within the past hour."""
    if not st.session_state.get("ai_models"): return False
    last = st.session_state.ai_models.get("last_loaded")
    if not last: return False
    return datetime.fromisoformat(last) + timedelta(hours=1) > datetime.now()

# ──────────────────────────────────────────────────────────────────────────────
# 9. extract_scene_class_name
# ──────────────────────────────────────────────────────────────────────────────
def extract_scene_class_name(python_code):
    """Regex for the first class inheriting from Scene."""
    m = re.findall(r"class\s+(\w+)\s*\([^)]*Scene[^)]*\)", python_code)
    return m[0] if m else "MyScene"

# ──────────────────────────────────────────────────────────────────────────────
# 10. highlight_code
# ──────────────────────────────────────────────────────────────────────────────
def highlight_code(code):
    """Return HTML+CSS highlighted Python code."""
    formatter = HtmlFormatter(style="monokai", full=True, noclasses=True)
    return highlight(code, PythonLexer(), formatter)

# ──────────────────────────────────────────────────────────────────────────────
# 11. generate_manim_preview
# ──────────────────────────────────────────────────────────────────────────────
def generate_manim_preview(python_code):
    """Show icons for detected Manim objects in code."""
    icons = []
    mapping = {
        "Circle":"⭕","Square":"🔲","MathTex":"📊","Tex":"📊",
        "Text":"📝","Axes":"📈","ThreeDScene":"🧊","Sphere":"🌐","Cube":"🧊"
    }
    for key,icon in mapping.items():
        if key in python_code: icons.append(icon)
    icons = icons or ["🎬"]
    html = f"""
    <div style="background:#000;color:#fff;padding:1rem;border-radius:8px;text-align:center;">
      <h4>Animation Preview</h4>
      <div style="font-size:2.5rem">{''.join(icons)}</div>
      <p style="opacity:0.7">Accurate preview requires full render</p>
    </div>
    """
    return html

# ──────────────────────────────────────────────────────────────────────────────
# 12. render_latex_preview
# ──────────────────────────────────────────────────────────────────────────────
def render_latex_preview(latex_formula):
    """Return HTML snippet with MathJax preview for LaTeX."""
    if not latex_formula:
        return """
        <div style="background:#f8f9fa;padding:1rem;border-radius:6px;text-align:center;color:#777;">
          Enter a LaTeX formula above.
        </div>"""
    return f"""
    <div style="background:#202124;color:#fff;padding:1rem;border-radius:6px;text-align:center;">
      <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
      <script async id="MathJax-script" src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
      <h4>LaTeX Preview</h4>
      <div>$$ {latex_formula} $$</div>
    </div>"""

# ──────────────────────────────────────────────────────────────────────────────
# 13. prepare_audio_for_manim
# ──────────────────────────────────────────────────────────────────────────────
def prepare_audio_for_manim(audio_file, target_dir):
    """Save uploaded audio and return filesystem path."""
    os.makedirs(target_dir, exist_ok=True)
    filename = f"audio_{int(time.time())}.mp3"
    out = os.path.join(target_dir, filename)
    with open(out, "wb") as f:
        f.write(audio_file.getvalue())
    return out

# ──────────────────────────────────────────────────────────────────────────────
# 14. mp4_to_gif
# ──────────────────────────────────────────────────────────────────────────────
def mp4_to_gif(mp4_path, output_path, fps=15):
    """Use ffmpeg to convert an MP4 to a looping GIF."""
    cmd = [
        "ffmpeg","-i",mp4_path,
        "-vf",f"fps={fps},scale=640:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse",
        "-loop","0",output_path
    ]
    res = subprocess.run(cmd, capture_output=True, text=True)
    return output_path if res.returncode==0 else None

# ──────────────────────────────────────────────────────────────────────────────
# 15. generate_manim_video
# ──────────────────────────────────────────────────────────────────────────────
def generate_manim_video(python_code, format_type, quality_preset, animation_speed=1.0, audio_path=None):
    """Render code via Manim CLI; fallback for GIF via ffmpeg."""
    temp_dir = tempfile.mkdtemp(prefix="manim_")
    try:
        scene = extract_scene_class_name(python_code)
        scene_file = os.path.join(temp_dir, "scene.py")
        with open(scene_file, "w", encoding="utf-8") as f:
            f.write(python_code)
        flag = QUALITY_PRESETS[quality_preset]["flag"]
        cmd = ["manim", scene_file, scene, flag, f"--format={format_type}"]
        proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True)
        output = []
        while True:
            line = proc.stdout.readline()
            if not line and proc.poll() is not None:
                break
            output.append(line)
        proc.wait()
        # find output file
        matches = list(Path(temp_dir).rglob(f"*.{format_type}"))
        if format_type == "gif" and not matches:
            # try ffmpeg fallback
            mp4s = list(Path(temp_dir).rglob("*.mp4"))
            if mp4s:
                gif = os.path.join(temp_dir, f"{scene}.gif")
                mp4_to_gif(str(mp4s[-1]), gif)
                matches = [Path(gif)]
        if not matches:
            return None, "❌ No output file found"
        data = matches[-1].read_bytes()
        return data, f"✅ Generated ({len(data)/(1024*1024):.1f} MB)"
    finally:
        shutil.rmtree(temp_dir, ignore_errors=True)

# ──────────────────────────────────────────────────────────────────────────────
# 16. detect_input_calls
# ──────────────────────────────────────────────────────────────────────────────
def detect_input_calls(code):
    """Scan for input() calls and extract prompts."""
    calls = []
    for i, line in enumerate(code.splitlines(), 1):
        if "input(" in line and not line.strip().startswith("#"):
            m = re.search(r'input\(["\'](.+?)["\']\)', line)
            prompt = m.group(1) if m else f"Input at line {i}"
            calls.append({"line": i, "prompt": prompt})
    return calls

# ──────────────────────────────────────────────────────────────────────────────
# 17. run_python_script
# ──────────────────────────────────────────────────────────────────────────────
def run_python_script(code, inputs=None, timeout=60):
    """Execute arbitrary Python code, capturing stdout/stderr, plots, DataFrames."""
    tmp = tempfile.mkdtemp(prefix="run_")
    result = {"stdout":"", "stderr":"", "exception":None, "plots":[], "dataframes":[], "execution_time":0}
    # override input()
    if inputs:
        wrapper = (
            "__INPUTS="+json.dumps(inputs)+"\n"
            "__IDX=0\n"
            "def input(prompt=''):\n"
            "    global __IDX\n"
            "    val = __INPUTS[__IDX] if __IDX<len(__INPUTS) else ''\n"
            "    __IDX +=1\n"
            "    print(prompt+val)\n"
            "    return val\n\n"
        )
        code = wrapper + code
    # ensure matplotlib & pandas imports
    if "plt" in code and "import matplotlib" not in code:
        code = "import matplotlib.pyplot as plt\n" + code
    if "pd." in code and "import pandas" not in code:
        code = "import pandas as pd\n" + code
    script_path = os.path.join(tmp, "script.py")
    with open(script_path, "w") as f:
        f.write(code)
    start = time.time()
    try:
        proc = subprocess.Popen([sys.executable, script_path],
                                stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                                cwd=tmp, text=True)
        out, err = proc.communicate(timeout=timeout)
        result["stdout"] = out
        result["stderr"] = err
    except subprocess.TimeoutExpired:
        proc.kill()
        result["stderr"] += f"\n⏱️ Execution timed out after {timeout}s"
    finally:
        result["execution_time"] = time.time() - start
    # plots & dataframes capture omitted for brevity
    shutil.rmtree(tmp, ignore_errors=True)
    return result

# ──────────────────────────────────────────────────────────────────────────────
# 18. display_python_script_results
# ──────────────────────────────────────────────────────────────────────────────
def display_python_script_results(res):
    """Render the result dict from run_python_script() in Streamlit."""
    if res["exception"]:
        st.error(f"Exception: {res['exception']}")
    if res["stderr"]:
        st.error("Errors:")
        st.code(res["stderr"])
    if res["stdout"]:
        st.markdown("### Output:")
        st.code(res["stdout"])
    st.info(f"Execution time: {res['execution_time']:.2f}s")
    # plots & dataframes display omitted for brevity

# ──────────────────────────────────────────────────────────────────────────────
# 19. parse_animation_steps
# ──────────────────────────────────────────────────────────────────────────────
def parse_animation_steps(python_code):
    """Extract self.play() and self.wait() steps into a list of dicts."""
    plays = re.findall(r"self\.play\((.*?)\)", python_code, re.DOTALL)
    waits = re.findall(r"self\.wait\((.*?)\)", python_code, re.DOTALL)
    steps = []
    current = 0.0
    for i, play in enumerate(plays):
        anims = [a.strip() for a in play.split(",")]
        dur = float(waits[i]) if i < len(waits) and re.match(r"[\d\.]+", waits[i]) else 1.0
        steps.append({"id": i+1, "animations": anims, "duration": dur, "start_time": current, "code": f"self.play({play})"})
        current += dur
    return steps

# ──────────────────────────────────────────────────────────────────────────────
# 20. generate_code_from_timeline
# ──────────────────────────────────────────────────────────────────────────────
def generate_code_from_timeline(animation_steps, original_code):
    """Regenerate the construct() method body from timeline steps."""
    class_match = re.search(r"(class\s+\w+\s*\([^)]*\)\s*:\s*.*?def\s+construct\s*\(self\)\s*:)", original_code, re.DOTALL)
    if not class_match:
        return original_code
    header = class_match.group(1)
    indent = " " * (len(header) - len(header.lstrip())) + "    "
    body = [header]
    for step in animation_steps:
        body.append(f"{indent}{step['code']}")
        body.append(f"{indent}self.wait({step['duration']})")
    return "\n".join(body)

# ──────────────────────────────────────────────────────────────────────────────
# 21. create_timeline_editor
# ──────────────────────────────────────────────────────────────────────────────
def create_timeline_editor(code):
    """Interactive timeline editor tab to reorder/update animation steps."""
    st.markdown("### 🎞 Animation Timeline")
    steps = parse_animation_steps(code)
    if not steps:
        st.warning("No animation steps detected.")
        return code
    df = pd.DataFrame(steps)
    fig = px.timeline(df, x_start="start_time", x_end=df["start_time"]+df["duration"],
                      y="id", color="id", hover_name="animations")
    fig.update_layout(height=300, showlegend=False, xaxis_title="Time (s)", yaxis_title="Step")
    st.plotly_chart(fig, use_container_width=True)
    cols = st.columns(3)
    step_id = cols[0].selectbox("Select Step", df["id"])
    new_dur = cols[1].number_input("New Duration (s)", min_value=0.1, step=0.1, value=float(df[df["id"]==step_id]["duration"]))
    action = cols[2].selectbox("Action", ["Update Duration","Delete Step","Move Up","Move Down"])
    if st.button("Apply"):
        idx = df[df["id"]==step_id].index[0]
        if action=="Update Duration":
            df.at[idx,"duration"]=new_dur
        elif action=="Delete Step":
            df = df[df["id"]!=step_id]
        elif action=="Move Up" and step_id>1:
            other = df[df["id"]==step_id-1].index[0]
            df.at[idx,"id"],df.at[other,"id"]=df.at[other,"id"],df.at[idx,"id"]
        elif action=="Move Down" and step_id<len(df):
            other = df[df["id"]==step_id+1].index[0]
            df.at[idx,"id"],df.at[other,"id"]=df.at[other,"id"],df.at[idx,"id"]
        df = df.sort_values("id").reset_index(drop=True)
        current=0.0
        for i,row in df.iterrows():
            df.at[i,"start_time"]=current
            current+=row["duration"]
        new_code = generate_code_from_timeline(df.to_dict("records"), code)
        st.success("Timeline updated!")
        return new_code
    return code

# ──────────────────────────────────────────────────────────────────────────────
# 22. export_to_educational_format
# ──────────────────────────────────────────────────────────────────────────────
def export_to_educational_format(video_data, format_type, animation_title, explanation_text, temp_dir):
    """Export the existing video_data to PPTX, HTML, or PDF sequence."""
    if format_type=="powerpoint":
        from pptx import Presentation
        from pptx.util import Inches
        prs = Presentation()
        slide = prs.slides.add_slide(prs.slide_layouts[0])
        slide.shapes.title.text = animation_title
        video_path = os.path.join(temp_dir,"video.mp4")
        with open(video_path,"wb") as f: f.write(video_data)
        slide2 = prs.slides.add_slide(prs.slide_layouts[5])
        slide2.shapes.title.text="Animation"
        slide2.shapes.add_movie(video_path, Inches(1),Inches(1.5),Inches(8),Inches(4.5))
        if explanation_text:
            txt_sl = prs.slides.add_slide(prs.slide_layouts[1])
            txt_sl.shapes.title.text="Explanation"
            txt_sl.placeholders[1].text=explanation_text
        out = os.path.join(temp_dir,f"{animation_title}.pptx")
        prs.save(out)
        return open(out,"rb").read(), "pptx"

    elif format_type=="html":
        html_template = """<!DOCTYPE html><html><head><meta charset="utf-8"><title>{title}</title></head><body>
        <h1>{title}</h1><video controls width="100%"><source src="data:video/mp4;base64,{b64}"></video>
        <div>{explanation}</div></body></html>"""
        b64 = base64.b64encode(video_data).decode()
        expl = markdown.markdown(explanation_text or "")
        content = html_template.format(title=animation_title,b64=b64,explanation=expl)
        out = os.path.join(temp_dir,f"{animation_title}.html")
        with open(out,"w",encoding="utf-8") as f: f.write(content)
        return open(out,"rb").read(), "html"

    elif format_type=="sequence":
        from fpdf import FPDF
        video_path = os.path.join(temp_dir,"video.mp4")
        with open(video_path,"wb") as f: f.write(video_data)
        frames_dir = os.path.join(temp_dir,"frames")
        os.makedirs(frames_dir, exist_ok=True)
        # extract 5 key frames
        subprocess.run(["ffmpeg","-i",video_path,"-vf","select=not(mod(n\\,10))","-vsync","vfr",
                        os.path.join(frames_dir,"frame_%03d.png")], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        pdf = FPDF()
        segments = explanation_text.split("##") if explanation_text else []
        for i, img in enumerate(sorted(os.listdir(frames_dir))):
            pdf.add_page()
            pdf.image(os.path.join(frames_dir,img), x=10,y=10,w=190)
            pdf.ln(100)
            txt = segments[i] if i<len(segments) else ""
            pdf.multi_cell(0, 5, txt)
        out = os.path.join(temp_dir,f"{animation_title}.pdf")
        pdf.output(out)
        return open(out,"rb").read(), "pdf"
    return None, None

# ──────────────────────────────────────────────────────────────────────────────
# 23. main
# ──────────────────────────────────────────────────────────────────────────────
def main():
    st.set_page_config(page_title="🎬 Manim Animation Studio", layout="wide")
    # Custom CSS
    st.markdown("""
    <style>
      .main-header { font-size:2.5rem; text-align:center; background:linear-gradient(90deg,#4F46E5,#818CF8); -webkit-background-clip:text; -webkit-text-fill-color:transparent; margin-bottom:1rem; }
      .card { background:#fff; padding:1rem; border-radius:8px; box-shadow:0 2px 6px rgba(0,0,0,0.1); margin-bottom:1rem; }
    </style>
    """, unsafe_allow_html=True)

    # Ensure packages installed once
    if 'packages_checked' not in st.session_state:
        ensure_packages()
        st.session_state.packages_checked = True

    # Sidebar
    with st.sidebar:
        st.header("⚙️ Settings")
        with st.expander("Render Settings", True):
            st.selectbox("Quality", list(QUALITY_PRESETS.keys()), key="quality")
            st.selectbox("Format", list(EXPORT_FORMATS.keys()), key="format")
            st.selectbox("Speed", list(ANIMATION_SPEEDS.keys()), key="speed")
        with st.expander("Custom Libraries"):
            txt = st.text_area("pip install …", help="e.g. scipy,networkx")
            if st.button("Install"):
                ok,msg = install_custom_packages(txt)
                st.code(msg)
        st.markdown("---")
        st.markdown("Manim Studio • Powered by Streamlit")

    # Tabs
    tabs = st.tabs(["✨ Editor","🤖 AI","📚 LaTeX","🎨 Assets","🎞️ Timeline","🎓 Export","🐍 Python"])

    # --- Editor Tab ---
    with tabs[0]:
        st.markdown("<div class='main-header'>✨ Animation Editor</div>", unsafe_allow_html=True)
        code = st.text_area("Python code", height=300, key="editor_code")
        st.markdown(generate_manim_preview(code), unsafe_allow_html=True)
        if st.button("🚀 Generate Animation"):
            data, status = generate_manim_video(
                code,
                EXPORT_FORMATS[st.session_state.format],
                st.session_state.quality,
                ANIMATION_SPEEDS[st.session_state.speed]
            )
            if data:
                st.video(data)
                st.success(status)
                st.session_state.last_video = data
            else:
                st.error(status)
        if st.session_state.get("last_video"):
            st.download_button("⬇️ Download Animation", st.session_state.last_video,
                               f"manim_animation.{EXPORT_FORMATS[st.session_state.format]}", use_container_width=True)

    # --- AI Tab ---
    with tabs[1]:
        st.markdown("<div class='main-header'>🤖 AI Animation Assistant</div>", unsafe_allow_html=True)
        if not check_password():
            return
        if "ai_models" not in st.session_state or not check_model_freshness():
            models = init_ai_models_direct()
            if models:
                st.session_state.ai_models = {**models, "last_loaded": datetime.now().isoformat()}
        st.markdown("### Describe your animation or paste code stub")
        prompt = st.text_area("Prompt / stub", height=150)
        if st.button("✨ Generate Code"):
            models = st.session_state.ai_models
            gen = suggest_code_completion(prompt, models)
            if gen:
                st.code(gen, language="python")
                if st.button("Use This Code"):
                    st.session_state.editor_code = gen
                    st.experimental_rerun()

    # --- LaTeX Tab ---
    with tabs[2]:
        st.markdown("<div class='main-header'>📚 LaTeX Formula Builder</div>", unsafe_allow_html=True)
        latex_input = st.text_input("LaTeX", key="latex_input", help="Raw string, e.g. r\"e^{i\\pi}+1=0\"")
        st.markdown(render_latex_preview(latex_input), unsafe_allow_html=True)
        if latex_input and st.button("Insert into Editor"):
            snippet = f"""formula = MathTex(r"{latex_input}")\nself.play(Write(formula))\nself.wait(2)"""
            st.session_state.editor_code += "\n    " + snippet
            st.success("Inserted into editor")
            st.experimental_rerun()

    # --- Assets Tab ---
    with tabs[3]:
        st.markdown("<div class='main-header'>🎨 Asset Management</div>", unsafe_allow_html=True)
        imgs = st.file_uploader("Upload images", accept_multiple_files=True)
        for img in imgs:
            st.image(img, width=150, caption=img.name)
            if st.button(f"Use {img.name}"):
                code_snip = f"""from manim import ImageMobject\nimg = ImageMobject(r"{img.name}")\nself.play(FadeIn(img))"""
                st.session_state.editor_code += "\n    " + code_snip
                st.success(f"Added {img.name} to code")
                st.experimental_rerun()
        audio = st.file_uploader("Upload audio", type=["mp3","wav"])
        if audio:
            path = prepare_audio_for_manim(audio, "manim_assets/audio")
            st.audio(audio)
            st.code(f"@with_sound(r\"{path}\")\nclass YourScene(Scene):\n    ...")

    # --- Timeline Tab ---
    with tabs[4]:
        st.markdown("<div class='main-header'>🎞️ Timeline Editor</div>", unsafe_allow_html=True)
        new_code = create_timeline_editor(st.session_state.get("editor_code",""))
        if new_code != st.session_state.get("editor_code",""):
            st.session_state.editor_code = new_code

    # --- Export Tab ---
    with tabs[5]:
        st.markdown("<div class='main-header'>🎓 Educational Export</div>", unsafe_allow_html=True)
        if not st.session_state.get("last_video"):
            st.warning("Generate an animation first")
        else:
            title = st.text_input("Animation Title", "My Animation")
            expl = st.text_area("Explanation (use ## for steps)")
            fmt = st.selectbox("Export Format", ["PowerPoint","HTML","PDF Sequence"])
            if st.button("📤 Export"):
                fmt_key = {"PowerPoint":"powerpoint","HTML":"html","PDF Sequence":"sequence"}[fmt]
                data,ft = export_to_educational_format(
                    st.session_state.last_video, fmt_key, title, expl, tempfile.mkdtemp()
                )
                if data:
                    ext = {"pptx":"pptx","html":"html","pdf":"pdf"}[ft]
                    st.success(f"{fmt} created")
                    st.download_button(f"⬇️ Download {fmt}", data, f"{title}.{ext}")

    # --- Python Tab ---
    with tabs[6]:
        st.markdown("<div class='main-header'>🐍 Python Script Runner</div>", unsafe_allow_html=True)
        script = st.text_area("Script", height=200, key="python_script")
        calls = detect_input_calls(script)
        inputs = []
        if calls:
            st.info("Detected input() calls – please provide values:")
            for c in calls:
                v = st.text_input(f"{c['prompt']} (line {c['line']})")
                inputs.append(v)
        if st.button("▶️ Run Script"):
            res = run_python_script(script, inputs)
            display_python_script_results(res)

if __name__ == "__main__":
    main()