from fastapi import FastAPI, HTTPException, Request
from fastapi.staticfiles import StaticFiles
from concurrent.futures import ThreadPoolExecutor
import asyncio
import aiohttp
import tempfile
import uuid
import shutil
import os
import random
import traceback
import string

app = FastAPI()

def generate_hash(length=12):
    # Characters that can appear in the hash
    characters = string.ascii_lowercase + string.digits
    # Generate a random string of the specified length
    hash_string = ''.join(random.choice(characters) for _ in range(length))
    return hash_string

@app.get("/")
async def read_root():
    return {"message": "Saqib's API"}

# Create a directory to store MP3 files if it doesn't exist
AUDIO_DIR = "audio_files"
os.makedirs(AUDIO_DIR, exist_ok=True)

# Create a directory for storing output files
OUTPUT_DIR = "output"
os.makedirs(OUTPUT_DIR, exist_ok=True)

# Mount the audio directory
app.mount("/audio", StaticFiles(directory=AUDIO_DIR), name="audio")

# Mount the output directory
app.mount("/output", StaticFiles(directory=OUTPUT_DIR), name="output")

thread_pool = ThreadPoolExecutor(max_workers=2)

async def run_ffmpeg_async(ffmpeg_command):
    loop = asyncio.get_running_loop()
    await loop.run_in_executor(thread_pool, ffmpeg_command)

async def download_file(url: str, suffix: str):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as response:
            if response.status != 200:
                raise HTTPException(status_code=400, detail=f"Failed to download file from {url}")
            with tempfile.NamedTemporaryFile(delete=False, suffix=suffix) as temp_file:
                temp_file.write(await response.read())
                return temp_file.name


@app.post("/add_audio_to_image")
async def add_audio_to_image(request: Request):
    try:
        # Generate a unique filename
        output_filename = f"{uuid.uuid4()}.mp4"
        output_path = os.path.join(OUTPUT_DIR, output_filename)

        # Call the modal API with the request data and download the output file
        data = await request.json()
        image_url = data.get("image_url")
        audio_url = data.get("audio_url")

        if not image_url or not audio_url:
            raise HTTPException(status_code=400, detail="Missing image_url or audio_url in request")

        image_file = await download_file(image_url, ".jpg")
        audio_file = await download_file(audio_url, ".mp3")

        # Run ffmpeg command with improved audio detection parameters
        ffmpeg_cmd = f"ffmpeg -loop 1 -i {image_file} -analyzeduration 10000000 -probesize 10000000 -i {audio_file} -c:v libx264 -tune stillimage -c:a aac -b:a 192k -strict experimental -shortest -pix_fmt yuv420p {output_path}"
        process = await asyncio.create_subprocess_shell(
            ffmpeg_cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, stderr = await process.communicate()

        if process.returncode != 0:
            print(f"FFmpeg error: {stderr.decode()}")
            raise HTTPException(status_code=500, detail=f"FFmpeg failed: {stderr.decode()}")

        # Clean up temporary files
        os.remove(image_file)
        os.remove(audio_file)

        # Return the URL path to the output file
        return f"/output/{output_filename}"
    except Exception as e:
        print(f"An error occurred: {str(e)}")
        print(traceback.format_exc())
        raise HTTPException(status_code=500, detail=f"An unexpected error occurred: {str(e)}")

@app.post("/add_audio_to_video")
async def add_audio_to_video(request: Request):
    try:
        # Generate a unique filename
        output_filename = f"{uuid.uuid4()}.mp4"
        output_path = os.path.join(OUTPUT_DIR, output_filename)

        # Call the modal API with the request data and download the output file
        data = await request.json()
        video_url = data.get("video_url")
        audio_url = data.get("audio_url")

        if not video_url or not audio_url:
            raise HTTPException(status_code=400, detail="Missing video_url or audio_url in request")

        video_file = await download_file(video_url, ".mp4")
        audio_file = await download_file(audio_url, ".mp3")

        # Run ffmpeg command with improved audio detection parameters
        ffmpeg_cmd = f"ffmpeg -analyzeduration 10000000 -probesize 10000000 -i {video_file} -analyzeduration 10000000 -probesize 10000000 -i {audio_file} -c:v copy -c:a aac -strict experimental -shortest {output_path}"
        process = await asyncio.create_subprocess_shell(
            ffmpeg_cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, stderr = await process.communicate()

        if process.returncode != 0:
            print(f"FFmpeg error: {stderr.decode()}")
            raise HTTPException(status_code=500, detail=f"FFmpeg failed: {stderr.decode()}")

        # Clean up temporary files
        os.remove(video_file)
        os.remove(audio_file)

        # Return the URL path to the output file
        return f"/output/{output_filename}"
    except Exception as e:
        print(f"An error occurred: {str(e)}")
        print(traceback.format_exc())
        raise HTTPException(status_code=500, detail=f"An unexpected error occurred: {str(e)}")

@app.post("/concatenate_videos")
async def concatenate_videos(request: Request):
    try:
        # Generate a unique filename for the output
        output_filename = f"{uuid.uuid4()}.mp4"
        output_path = os.path.join(OUTPUT_DIR, output_filename)

        # Call the modal API with the request data and download the output file
        data = await request.json()
        video_urls = data.get("video_urls")

        if not video_urls or not isinstance(video_urls, list):
            raise HTTPException(status_code=400, detail="Invalid video_urls in request. Must be a list of URLs.")

        # Download the video files
        video_files = []
        for i, url in enumerate(video_urls):
            video_file = await download_file(url, f"_{i}.mp4")
            video_files.append(video_file)

        # Create a temporary file with the list of input files
        concat_list_path = os.path.join(OUTPUT_DIR, "concat_list.txt")
        with open(concat_list_path, "w") as f:
            for file in video_files:
                f.write(f"file '{file}'\n")

        # Run ffmpeg command
        ffmpeg_cmd = f"ffmpeg -f concat -safe 0 -i {concat_list_path} -c copy {output_path}"
        process = await asyncio.create_subprocess_shell(
            ffmpeg_cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, stderr = await process.communicate()

        if process.returncode != 0:
            print(f"FFmpeg error: {stderr.decode()}")
            raise HTTPException(status_code=500, detail=f"FFmpeg failed: {stderr.decode()}")

        # Clean up temporary files
        for file in video_files:
            os.remove(file)
        os.remove(concat_list_path)

        # Return the URL path to the output file
        return f"/output/{output_filename}"

    except Exception as e:
        print(f"An error occurred: {str(e)}")
        print(traceback.format_exc())
        raise HTTPException(status_code=500, detail=f"An unexpected error occurred: {str(e)}")
    
@app.post("/concatenate_audio")
async def concatenate_audio(request: Request):
    try:
        # Generate a unique filename for the output
        output_filename = f"{uuid.uuid4()}.mp3"
        output_path = os.path.join(AUDIO_DIR, output_filename)

        # Call the modal API with the request data and download the output file
        data = await request.json()
        audio_urls = data.get("audio_urls")

        if not audio_urls or not isinstance(audio_urls, list):
            raise HTTPException(status_code=400, detail="Invalid audio_urls in request. Must be a list of URLs.")

        # Download the audio files
        audio_files = []
        for i, url in enumerate(audio_urls):
            audio_file = await download_file(url, f"_{i}.mp3")
            audio_files.append(audio_file)

        # Create a temporary file with the list of input files
        concat_list_path = os.path.join(AUDIO_DIR, "concat_list.txt")
        with open(concat_list_path, "w") as f:
            for file in audio_files:
                f.write(f"file '{file}'\n")

        # Run ffmpeg command with improved audio parameters
        ffmpeg_cmd = f"ffmpeg -f concat -safe 0 -i {concat_list_path} -c:a aac -b:a 192k -strict experimental {output_path}"
        process = await asyncio.create_subprocess_shell(
            ffmpeg_cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, stderr = await process.communicate()

        if process.returncode != 0:
            print(f"FFmpeg error: {stderr.decode()}")
            raise HTTPException(status_code=500, detail=f"FFmpeg failed: {stderr.decode()}")

        # Clean up temporary files
        for file in audio_files:
            os.remove(file)
        os.remove(concat_list_path)

        # Return the URL path to the output file
        return f"/audio/{output_filename}"

    except Exception as e:
        print(f"An error occurred: {str(e)}")
        print(traceback.format_exc())
        raise HTTPException(status_code=500, detail=f"An unexpected error occurred: {str(e)}")

@app.post("/make_video")
async def make_video(request: Request):
    try:
        # Generate a unique filename for the output
        output_filename = f"{uuid.uuid4()}.mp4"
        output_path = os.path.join(OUTPUT_DIR, output_filename)
        temp_dir = os.path.join(tempfile.gettempdir(), generate_hash())
        os.makedirs(temp_dir, exist_ok=True)

        data = await request.json()
        assets = data.get("assets", {})
        clips = assets.get("clips", [])
        music_url = assets.get("music_url")
        volume_adjustment = data.get("volume_adjustment", 1.0)  # Default to normal volume if not specified

        if not clips or not isinstance(clips, list):
            raise HTTPException(status_code=400, detail="Invalid clips in request.")

        # Create a list to hold clip video files that we'll concatenate later
        clip_videos = []
        segment_list_path = os.path.join(temp_dir, "segment_list.txt")
        
        with open(segment_list_path, "w") as segment_file:
            # Process each clip: combine image with its audio
            for i, clip in enumerate(clips):
                image_url = clip.get("image_url")
                audio_url = clip.get("audio_url")
                
                if not image_url or not audio_url:
                    raise HTTPException(status_code=400, detail=f"Missing image_url or audio_url in clip {i}")
                
                # Download files
                image_file = await download_file(image_url, ".jpg")
                audio_file = await download_file(audio_url, ".mp3")
                
                # Create segment video
                segment_output = os.path.join(temp_dir, f"segment_{i}.mp4")
                
                # Run ffmpeg command to create video segment
                segment_cmd = f'ffmpeg -loop 1 -i {image_file} -i {audio_file} -c:v libx264 -tune stillimage -c:a aac -b:a 192k -shortest -pix_fmt yuv420p {segment_output}'
                proc = await asyncio.create_subprocess_shell(
                    segment_cmd,
                    stdout=asyncio.subprocess.PIPE,
                    stderr=asyncio.subprocess.PIPE
                )
                _, stderr = await proc.communicate()
                
                if proc.returncode != 0:
                    print(f"FFmpeg error for segment {i}: {stderr.decode()}")
                    raise HTTPException(status_code=500, detail=f"FFmpeg failed for segment {i}: {stderr.decode()}")
                
                # Add to list for concatenation
                clip_videos.append(segment_output)
                segment_file.write(f"file '{segment_output}'\n")
                
                # Clean up individual files
                os.remove(image_file)
                os.remove(audio_file)
        
        # Concatenate all segment videos
        concat_output = os.path.join(temp_dir, "concat_output.mp4")
        concat_cmd = f'ffmpeg -f concat -safe 0 -i {segment_list_path} -c copy {concat_output}'
        
        proc = await asyncio.create_subprocess_shell(
            concat_cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, stderr = await proc.communicate()
        
        if proc.returncode != 0:
            print(f"FFmpeg concat error: {stderr.decode()}")
            raise HTTPException(status_code=500, detail=f"FFmpeg concat failed: {stderr.decode()}")
        
        # If there's a music URL, download it and mix with the video
        if music_url:
            music_file = await download_file(music_url, ".wav")
            
            # Final command to mix music with video at specified volume
            final_cmd = (
                f'ffmpeg -i {concat_output} -i {music_file} -filter_complex '
                f'"[1:a]volume={volume_adjustment}[music];[0:a][music]amix=inputs=2:duration=longest" '
                f'-c:v copy {output_path}'
            )
            
            proc = await asyncio.create_subprocess_shell(
                final_cmd,
                stdout=asyncio.subprocess.PIPE,
                stderr=asyncio.subprocess.PIPE
            )
            _, stderr = await proc.communicate()
            
            if proc.returncode != 0:
                print(f"FFmpeg final mix error: {stderr.decode()}")
                raise HTTPException(status_code=500, detail=f"FFmpeg music mixing failed: {stderr.decode()}")
            
            os.remove(music_file)
        else:
            # If no music, just copy the concatenated output
            shutil.copy(concat_output, output_path)
        
        # Clean up temporary files and directory
        for video_file in clip_videos:
            os.remove(video_file)
        os.remove(segment_list_path)
        os.remove(concat_output)
        os.rmdir(temp_dir)

        # Return the URL path to the output file
        return f"/output/{output_filename}"

    except Exception as e:
        print(f"An error occurred: {str(e)}")
        print(traceback.format_exc())
        raise HTTPException(status_code=500, detail=f"An unexpected error occurred: {str(e)}")

@app.post("/create_slideshow")
async def create_slideshow(request: Request):
    try:
        # Generate a unique filename for the output
        output_filename = f"{uuid.uuid4()}.mp4"
        output_path = os.path.join(OUTPUT_DIR, output_filename)
        temp_dir = os.path.join(tempfile.gettempdir(), generate_hash())
        os.makedirs(temp_dir, exist_ok=True)

        data = await request.json()
        image_urls = data.get("image_urls")
        audio_url = data.get("audio_url")
        duration = data.get("duration", 4)  # Default to 4 seconds per image if not specified

        if not image_urls or not isinstance(image_urls, list):
            raise HTTPException(status_code=400, detail="Invalid image_urls in request. Must be a list of URLs.")

        if not audio_url:
            raise HTTPException(status_code=400, detail="Missing audio_url in request.")

        # Download the images
        image_files = []
        for i, url in enumerate(image_urls):
            image_file = await download_file(url, f"_{i}.jpg")
            image_files.append(image_file)

        # Download audio file
        audio_file = await download_file(audio_url, ".mp3")
        
        # Pre-process audio file to ensure it's valid
        normalized_audio = os.path.join(temp_dir, "normalized_audio.wav")
        audio_check_cmd = (
            f'ffmpeg -i {audio_file} -af "aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo" '
            f'-y {normalized_audio}'
        )
        audio_process = await asyncio.create_subprocess_shell(
            audio_check_cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, audio_stderr = await audio_process.communicate()

        # If audio normalization fails, create a silent audio track
        if audio_process.returncode != 0:
            print(f"Audio normalization failed: {audio_stderr.decode()}")
            print("Creating silent audio track instead...")
            
            # Calculate total video duration based on number of images and duration per image
            total_duration = len(image_urls) * duration
            
            silent_cmd = (
                f'ffmpeg -f lavfi -i anullsrc=r=44100:cl=stereo -t {total_duration} '
                f'-y {normalized_audio}'
            )
            silent_process = await asyncio.create_subprocess_shell(
                silent_cmd,
                stdout=asyncio.subprocess.PIPE,
                stderr=asyncio.subprocess.PIPE
            )
            _, silent_stderr = await silent_process.communicate()
            
            if silent_process.returncode != 0:
                print(f"Silent audio creation failed: {silent_stderr.decode()}")
                # Fall back to no audio if even silent audio fails
                normalized_audio = None

        # Create a text file with the list of images and their duration
        images_list_path = os.path.join(temp_dir, "images_list.txt")
        with open(images_list_path, "w") as f:
            for file in image_files:
                f.write(f"file '{file}'\n")
                f.write(f"duration {duration}\n")
            # Add the last image again with a small duration to prevent ffmpeg from cutting it off
            f.write(f"file '{image_files[-1]}'\n")
            f.write(f"duration 0.1\n")

        # Create intermediate video without audio
        intermediate_video = os.path.join(temp_dir, "intermediate.mp4")
        # Use the complex concat demuxer for images to create a slideshow
        concat_cmd = (
            f'ffmpeg -f concat -safe 0 -i {images_list_path} -vsync vfr '
            f'-pix_fmt yuv420p -c:v libx264 -r 30 {intermediate_video}'
        )
        process = await asyncio.create_subprocess_shell(
            concat_cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )
        _, stderr = await process.communicate()

        if process.returncode != 0:
            print(f"FFmpeg slideshow creation error: {stderr.decode()}")
            raise HTTPException(status_code=500, detail=f"FFmpeg slideshow creation failed: {stderr.decode()}")

        # Add audio to the slideshow only if normalized_audio is available
        if normalized_audio:
            final_cmd = (
                f'ffmpeg -i {intermediate_video} -i {normalized_audio} '
                f'-c:v copy -c:a aac -b:a 192k -shortest {output_path}'
            )
            process = await asyncio.create_subprocess_shell(
                final_cmd,
                stdout=asyncio.subprocess.PIPE,
                stderr=asyncio.subprocess.PIPE
            )
            _, stderr = await process.communicate()

            if process.returncode != 0:
                print(f"FFmpeg audio addition error: {stderr.decode()}")
                # If adding audio fails, use just the video
                shutil.copy(intermediate_video, output_path)
        else:
            # If no normalized audio available, use just the video
            shutil.copy(intermediate_video, output_path)

        # Clean up temporary files
        for file in image_files:
            if os.path.exists(file):
                os.remove(file)
        
        if os.path.exists(images_list_path):
            os.remove(images_list_path)
        
        if os.path.exists(intermediate_video):
            os.remove(intermediate_video)
            
        if os.path.exists(audio_file):
            os.remove(audio_file)
            
        if normalized_audio and os.path.exists(normalized_audio):
            os.remove(normalized_audio)
            
        try:
            os.rmdir(temp_dir)
        except OSError:
            # Directory might not be empty, try to clean up remaining files
            for remaining_file in os.listdir(temp_dir):
                try:
                    os.remove(os.path.join(temp_dir, remaining_file))
                except:
                    pass
            try:
                os.rmdir(temp_dir)
            except:
                pass

        # Return the URL path to the output file
        return f"/output/{output_filename}"

    except Exception as e:
        print(f"An error occurred: {str(e)}")
        print(traceback.format_exc())
        raise HTTPException(status_code=500, detail=f"An unexpected error occurred: {str(e)}")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)