import os
import subprocess
import tarfile
import asyncio
from fastapi import FastAPI, HTTPException, Form, UploadFile, File, Depends, Query, Response
from fastapi.responses import HTMLResponse, FileResponse, StreamingResponse
from pydantic import BaseModel
from tempfile import NamedTemporaryFile
from typing import List
from pydantic import BaseModel
from fastapi.staticfiles import StaticFiles

app = FastAPI()

REQUIREMENTS_FILE = "requirements1.txt"

class DockerImageParams(BaseModel):
    image_name: str
    tag: str = 'latest'

async def stream_log(file_path):
    with open(file_path, 'r') as file:
        while True:
            line = file.readline()
            if line:
                yield line
            else:
                await asyncio.sleep(0.1)

import os
import subprocess
import urllib.request
import shutil

def install_python_version(python_version: str, use_deb: bool = False, install_dir: str = os.path.expanduser("~/local")):
    base_url = "https://www.python.org/ftp/python"
    python_bin = f"{install_dir}/bin/python{python_version}"
    pip_bin = f"{install_dir}/bin/pip{python_version}"

    # Check if Python is already installed
    if os.path.isfile(python_bin):
        return python_bin, pip_bin

    try:
        os.makedirs(install_dir, exist_ok=True)
        if use_deb:
            raise NotImplementedError("Debian package installation requires root permissions.")
        else:
            # For .tar.xz binary distribution
            tar_url = f"{base_url}/{python_version}/Python-{python_version}-linux-x86_64.tar.xz"
            tar_path = f"/tmp/Python-{python_version}.tar.xz"
            
            # Download Python source tarball
            urllib.request.urlretrieve(tar_url, tar_path)
            
            # Extract tarball
            subprocess.run(["tar", "-xf", tar_path, "-C", "/tmp"], check=True)
            
            # Build and install Python to the specified directory
            python_src_path = f"/tmp/Python-{python_version}"
            subprocess.run([f"{python_src_path}/configure", f"--prefix={install_dir}"], cwd=python_src_path, check=True)
            subprocess.run(["make", "-j"], cwd=python_src_path, check=True)
            subprocess.run(["make", "install"], cwd=python_src_path, check=True)
            
            # Clean up
            os.remove(tar_path)
            shutil.rmtree(python_src_path)

    except urllib.error.HTTPError as e:
        raise RuntimeError(f"HTTP Error: {str(e)}")
    except subprocess.CalledProcessError as e:
        raise RuntimeError(f"Error installing Python {python_version}: {str(e)}")
    except Exception as e:
        raise RuntimeError(f"Error: {str(e)}")

    return python_bin, pip_bin


# @app.post("/download-dependencies")
# async def download_dependencies(requirements_file: UploadFile = File(...)):
#     try:
#         with NamedTemporaryFile(delete=False) as tmp:
#             tmp.write(requirements_file.file.read())
#             tmp_path = tmp.name

#         # Ensure the directories exist
#         os.makedirs("/tmp/dependencies", exist_ok=True)

#         log_file_path = "/tmp/dependencies/download.log"
#         with open(log_file_path, "w") as log_file:
#             # Download dependencies
#             result = subprocess.run(
#                 ["pip", "download", "-r", tmp_path, "-d", "/tmp/dependencies"],
#                 # stdout=log_file,
#                 # stderr=log_file
#             )

#         if result.returncode != 0:
#             raise HTTPException(status_code=500, detail="Error downloading dependencies. See log file for details.")

#         # Create a tar file
#         tar_path = "/tmp/dependencies.tar.gz"
#         with tarfile.open(tar_path, "w:gz") as tar:
#             for root, _, files in os.walk("/tmp/dependencies"):
#                 for file in files:
#                     file_path = os.path.join(root, file)
#                     tar.add(file_path, arcname=file)
#             tar.add(log_file_path, arcname="download.log")

#         # Get the file size
#         file_size = os.path.getsize(tar_path)

#         # Return the tar file
#         return StreamingResponse(open(tar_path, "rb"), media_type="application/gzip", headers={
#             "Content-Disposition": f"attachment; filename=dependencies.tar.gz",
#             "Content-Length": str(file_size)
#         })

#     except subprocess.CalledProcessError as e:
#         raise HTTPException(status_code=500, detail=f"Error downloading dependencies: {str(e)}")
#     except Exception as e:
#         raise HTTPException(status_code=500, detail=str(e))
#     finally:
#         if os.path.exists(tmp_path):
#             os.remove(tmp_path)
#         if os.path.exists(log_file_path):
#             os.remove(log_file_path)
#         if os.path.exists(tar_path):
#             os.remove(tar_path)        

@app.post("/download-dependencies")
async def download_dependencies(
    requirements_file: UploadFile = File(...),
    python_version: str = Form(None),
):
    tmp_path = None
    log_file_path = None
    tar_path = None
    
    try:
        # Use the current Python version if not specified
        if not python_version:
            python_version = "3.11"  # Adjust to your current version or use `sys.version_info`

        python_bin, pip_bin = install_python_version(python_version)

        # Validate the installed Python and pip
        if not os.path.isfile(python_bin):
            raise HTTPException(status_code=400, detail=f"Python {python_version} installation failed.")
        
        if not os.path.isfile(pip_bin):
            raise HTTPException(status_code=400, detail=f"pip for Python {python_version} installation failed.")
        
        with NamedTemporaryFile(delete=False) as tmp:
            tmp.write(requirements_file.file.read())
            tmp_path = tmp.name

        # Ensure the directories exist
        os.makedirs("/tmp/dependencies", exist_ok=True)

        log_file_path = "/tmp/dependencies/download.log"
        with open(log_file_path, "w") as log_file:
            # Download dependencies using the specified Python version
            result = subprocess.run(
                [python_bin, "-m", "pip", "download", "-r", tmp_path, "-d", "/tmp/dependencies"],
                stdout=log_file,
                stderr=log_file
            )

        if result.returncode != 0:
            raise HTTPException(status_code=500, detail="Error downloading dependencies. See log file for details.")

        # Create a tar file
        tar_path = "/tmp/dependencies.tar.gz"
        with tarfile.open(tar_path, "w:gz") as tar:
            for root, _, files in os.walk("/tmp/dependencies"):
                for file in files:
                    file_path = os.path.join(root, file)
                    tar.add(file_path, arcname=file)
            tar.add(log_file_path, arcname="download.log")

        # Get the file size
        file_size = os.path.getsize(tar_path)

        # Return the tar file
        return StreamingResponse(open(tar_path, "rb"), media_type="application/gzip", headers={
            "Content-Disposition": f"attachment; filename=dependencies.tar.gz",
            "Content-Length": str(file_size)
        })

    except subprocess.CalledProcessError as e:
        raise HTTPException(status_code=500, detail=f"Error downloading dependencies: {str(e)}")
    except Exception as e:
        print(str(e), "dddddddddddddddddddd")
        raise HTTPException(status_code=500, detail=str(e))
    finally:
        if tmp_path and os.path.exists(tmp_path):
            os.remove(tmp_path)
        if log_file_path and os.path.exists(log_file_path):
            os.remove(log_file_path)
        if tar_path and os.path.exists(tar_path):
            os.remove(tar_path)

def download_docker_image(image_name, tag='latest', destination='/tmp/docker-images'):
    try:
        os.makedirs(destination, exist_ok=True)
        
        tar_path = os.path.join(destination, f'{image_name.replace("/", "_")}.tar')

        # Remove the existing tar file if it exists
        if os.path.exists(tar_path):
            os.remove(tar_path)

        # Skopeo command to copy the image as a tar file
        command = [
            'skopeo', 'copy',
            f'docker://{image_name}:{tag}',
            f'docker-archive:{tar_path}'
        ]
        subprocess.run(command, check=True)
        print(f"Image '{image_name}:{tag}' downloaded successfully to {destination}.")
        return tar_path
    except subprocess.CalledProcessError as e:
        print(f"Error downloading image: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Error downloading Docker image: {str(e)}")

# Serve static files
app.mount("/static", StaticFiles(directory="static"), name="static")

@app.get("/", response_class=HTMLResponse)
async def read_root():
    html_content = """
    <html>
    <head>
        <title>Azeez's Help Desk</title>
        <link href="/static/css/index.css" rel="stylesheet">
        <script src="/static/js/index.js"></script>
    </head>
    <body>
        <h1>Welcome to Azeez's Help Desk :)</h1>

        <div class="tab">
        <button class="tablink" onclick="openTab(event, 'Docker')" id="defaultOpen">Docker Image Download</button>
        <button class="tablink" onclick="openTab(event, 'Pip')">Pip Dependencies Download</button>
        <button class="tablink" onclick="openTab(event, 'Deb')">Debian Packages Download</button>
        </div>

        <div id="Docker" class="tabcontent">
            <h2>Docker Image Download</h2>
            <form onsubmit="handleDockerFormSubmit(event)">
                <label for="image_name">Docker Image Name:</label>
                <input type="text" id="image_name" name="image_name" required><br><br>
                
                <label for="tag">Docker Image Tag:</label>
                <input type="text" id="tag" name="tag" value="latest" required><br><br>
                
                <input type="submit" id="docker-submit-button" value="Download Docker Image">
            </form>
            <div id="docker-message" style="display: none; margin-top: 10px;"></div>
        </div>

        <div id="Pip" class="tabcontent">
            <h2>Pip Dependencies Download</h2>
            <form onsubmit="handlePipFormSubmit(event)">
                <label for="requirements_file">Requirements File:</label>
                <input type="file" id="requirements_file" name="requirements_file" accept=".txt" required><br><br>
                
                <label for="python_version">Python Version</label>
                <input type="text" id="python_version" name="python_version"><br><br>
                
                <input type="submit" id="pip-submit-button" value="Download Dependencies">
            </form>
            <div id="pip-message" style="display: none; margin-top: 10px;"></div>
        </div>

        <div id="Deb" class="tabcontent">
            <h2>Debian Packages Download</h2>
            <form onsubmit="handleDebFormSubmit(event)">
                <label for="deb_packages">Debian Package Names (comma-separated):</label>
                <input type="text" id="deb_packages" name="deb_packages" required><br><br>
                
                <input type="submit" id="deb-submit-button" value="Download Debian Packages">
            </form>
            <div id="deb-message" style="display: none; margin-top: 10px;"></div>
        </div>
        <div id="progress-container">
                <div id="progress-bar">0%</div>
        </div>
    </body>
    </html>
    """
    return HTMLResponse(content=html_content)

@app.get("/download-docker-image")
async def download_docker_image_endpoint(image_name: str = Query(...), tag: str = Query('latest')):
    tar_path = download_docker_image(image_name, tag)
    file_size = os.path.getsize(tar_path)
    
    def iterfile():
        with open(tar_path, 'rb') as file:
            while chunk := file.read(1024 * 1024):  # Read in 1 MB chunks
                yield chunk

    headers = {
        "Content-Disposition": f'attachment; filename="{image_name.replace("/", "_")}.tar"',
        "Content-Length": str(file_size)
    }

    return StreamingResponse(iterfile(), media_type='application/x-tar', headers=headers)

def create_tar_file(files_to_package: List[str], tar_filename: str, destination_dir: str):
    """
    Create a tar file containing specified files.
    Args:
    - files_to_package (list): List of paths to files to include in the tar file.
    - tar_filename (str): Name of the tar file to create.
    - destination_dir (str): Directory to save the tar file.
    """
    try:
        tar_path = os.path.join(destination_dir, tar_filename)
        with tarfile.open(tar_path, "w:gz") as tar:
            for file_path in files_to_package:
                tar.add(file_path, arcname=os.path.basename(file_path))
        print(f"Created tar file '{tar_filename}' successfully in '{destination_dir}'.")
        return tar_path
    except Exception as e:
        print(f"Error creating tar file: {e}")
        raise

def download_deb_packages(package_names: List[str], destination_dir: str) -> List[str]:
    """
    Download Debian packages (`.deb`) and their dependencies using `apt-get download`.
    Args:
    - package_names (list): List of package names to download.
    - destination_dir (str): Directory to save downloaded packages.
    Returns:
    - List of paths to downloaded `.deb` packages.
    """
    try:
        # Create the destination directory if it doesn't exist
        os.makedirs(destination_dir, exist_ok=True)

        downloaded_packages = []

        # Download each package and its dependencies
        for package_name in package_names:
            # Run apt-get update to refresh package index
            # subprocess.run(['apt-get', 'update'], check=True)
            # Download the package to the destination directory
            subprocess.run(['apt-get', 'download', package_name, '-d', destination_dir], check=True)
            # Build the full path to the downloaded package
            deb_filename = f"{package_name}.deb"
            downloaded_packages.append(os.path.join(destination_dir, deb_filename))

        return downloaded_packages

    except subprocess.CalledProcessError as e:
        print(f"Error downloading packages: {e}")
        raise

import subprocess

def download_make_package(destination_dir):
    try:
        # Ensure the destination directory exists
        subprocess.run(['mkdir', '-p', destination_dir])

        # Download the make package
        result = subprocess.run(['apt-get', 'download', 'make', '-d', destination_dir], check=True)

        if result.returncode == 0:
            print(f"Downloaded make package and dependencies to {destination_dir} successfully.")
        else:
            print("Failed to download make package.")

    except subprocess.CalledProcessError as e:
        print(f"Error downloading packages: {e}")

@app.post("/download-deb-packages")
async def download_deb_packages_handler(deb_packages: str = Form(...)):
    try:
        destination_dir = '/tmp/downloaded_packages'
        subprocess.run(['mkdir', '-p', destination_dir])  # Ensure destination directory exists

        package_name='make'

        # Download the package using apt-get
        result = subprocess.run(['apt-get', 'install', package_name], check=True)

        # If download is successful, return the downloaded package
        if result.returncode == 0:
            tar_filename = f'{package_name}.tar.gz'
            tar_path = f'{destination_dir}/{tar_filename}'
            return FileResponse(tar_path, filename=tar_filename)

        # If download fails, raise HTTPException
        else:
            raise HTTPException(status_code=500, detail=f"Failed to download {package_name} package.")

    except subprocess.CalledProcessError as e:
        error_message = str(e.stderr)
        print(f"Error downloading packages: {error_message}")
        raise HTTPException(status_code=500, detail=f"Error downloading {package_name} package: {error_message}")

    except Exception as e:
        print(f"Error: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Failed to download {package_name} package: {str(e)}")


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=5000)