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from flask import Flask, request, send_file, render_template_string
import os
import shutil
import subprocess
import tempfile
import logging
from markupsafe import escape
import glob

app = Flask(__name__)

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# HTML template with license checkbox
HTML_TEMPLATE = """
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Python to APK Converter</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        body {
            background-color: #f8f9fa;
        }
        .container {
            max-width: 800px;
            margin-top: 2rem;
        }
        .card {
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        .form-label {
            font-weight: 500;
        }
        .btn-primary {
            background-color: #007bff;
            border: none;
            padding: 0.75rem 1.5rem;
        }
        .btn-primary:hover {
            background-color: #0056b3;
        }
        .alert {
            margin-top: 1rem;
        }
        #progress-container {
            display: none;
            margin-top: 1rem;
        }
        .download-link {
            font-size: 1.1rem;
            margin-top: 1rem;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="card p-4">
            <h1 class="text-center mb-4">Python to Android APK Converter</h1>
            <form id="convert-form" method="POST" action="/convert">
                <div class="mb-3">
                    <label for="app_name" class="form-label">App Name (alphanumeric, no spaces)</label>
                    <input type="text" class="form-control" id="app_name" name="app_name" required pattern="[A-Za-z0-9]+">
                    <div class="invalid-feedback">Please enter a valid alphanumeric app name with no spaces.</div>
                </div>
                <div class="mb-3">
                    <label for="code" class="form-label">Python Code (Toga-compatible, e.g., app.py)</label>
                    <textarea class="form-control" id="code" name="code" rows="10" required></textarea>
                </div>
                <div class="mb-3">
                    <label for="requirements" class="form-label">Requirements.txt (optional, list dependencies like requests==2.28.1)</label>
                    <textarea class="form-control" id="requirements" name="requirements" rows="5"></textarea>
                </div>
                <div class="mb-3 form-check">
                    <input type="checkbox" class="form-check-input" id="license_agreement" name="license_agreement" required>
                    <label class="form-check-label" for="license_agreement">
                        I accept the <a href="https://developer.android.com/studio/terms" target="_blank">Android SDK License Agreement</a>
                    </label>
                    <div class="invalid-feedback">You must accept the Android SDK License Agreement to proceed.</div>
                </div>
                <button type="submit" class="btn btn-primary w-100" id="convert-btn" disabled>Convert to APK</button>
            </form>
            <div id="progress-container" class="text-center">
                <div class="spinner-border text-primary" role="status">
                    <span class="visually-hidden">Converting...</span>
                </div>
                <p class="mt-2">Converting your code to APK...</p>
            </div>
            {% if error %}
                <div class="alert alert-danger mt-3" role="alert">
                    <strong>Error:</strong> {{ error | safe }}
                </div>
            {% endif %}
            {% if apk_path %}
                <div class="alert alert-success mt-3" role="alert">
                    <strong>Success!</strong> APK generated! 
                    <a href="/download/{{ apk_path }}" class="download-link">Download APK</a>
                </div>
            {% endif %}
            {% if logs %}
                <div class="mt-3">
                    <h5>Build Logs</h5>
                    <pre class="border p-3 bg-light" style="max-height: 300px; overflow-y: auto;">{{ logs | safe }}</pre>
                </div>
            {% endif %}
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
    <script>
        // Enable submit button only when license is accepted
        const licenseCheckbox = document.getElementById('license_agreement');
        const convertBtn = document.getElementById('convert-btn');
        licenseCheckbox.addEventListener('change', function() {
            convertBtn.disabled = !this.checked;
        });

        // Form submission with progress indicator
        document.getElementById('convert-form').addEventListener('submit', function() {
            convertBtn.disabled = true;
            document.getElementById('progress-container').style.display = 'block';
        });

        // Client-side validation for app name
        const appNameInput = document.getElementById('app_name');
        appNameInput.addEventListener('input', function() {
            if (appNameInput.validity.patternMismatch) {
                appNameInput.classList.add('is-invalid');
            } else {
                appNameInput.classList.remove('is-invalid');
            }
        });
    </script>
</body>
</html>
"""

@app.route("/", methods=["GET"])
def index():
    return render_template_string(HTML_TEMPLATE)

@app.route("/convert", methods=["POST"])
def convert():
    app_name = request.form.get("app_name").replace(" ", "_")
    code = request.form.get("code")
    requirements = request.form.get("requirements")
    license_agreement = request.form.get("license_agreement")
    logs = []

    # Validate license agreement
    if license_agreement != "on":
        logs.append("Validation error: You must accept the Android SDK License Agreement.")
        return render_template_string(HTML_TEMPLATE, error="You must accept the Android SDK License Agreement to proceed.", logs="\n".join(logs))

    # Validate app name
    if not app_name.isalnum():
        logs.append("Validation error: App name must be alphanumeric with no spaces.")
        return render_template_string(HTML_TEMPLATE, error="App name must be alphanumeric with no spaces.", logs="\n".join(logs))

    # Log Python and pip versions for debugging
    try:
        python_version = subprocess.run(
            ["python3", "--version"],
            capture_output=True,
            text=True,
            check=True
        ).stdout.strip()
        logs.append(f"Python version: {python_version}")
        pip_version = subprocess.run(
            ["python3", "-m", "pip", "--version"],
            capture_output=True,
            text=True,
            check=True
        ).stdout.strip()
        logs.append(f"pip version: {pip_version}")
    except subprocess.CalledProcessError as e:
        logs.append("Error: Failed to verify Python or pip:")
        logs.append(e.stderr)
        return render_template_string(HTML_TEMPLATE, error="Failed to verify Python/pip environment.", logs="\n".join(logs))

    # Create a temporary directory for the project
    with tempfile.TemporaryDirectory() as temp_dir:
        project_dir = os.path.join(temp_dir, app_name)
        logs.append(f"Created temporary project directory: {project_dir}")
        os.makedirs(project_dir, exist_ok=True)

        # Create the Python app structure
        src_dir = os.path.join(project_dir, "src", app_name)
        os.makedirs(src_dir, exist_ok=True)
        logs.append(f"Created source directory: {src_dir}")

        # Write the user-provided code to app.py
        app_file = os.path.join(src_dir, "app.py")
        with open(app_file, "w") as f:
            f.write(code)
        logs.append(f"Wrote user code to: {app_file}")

        # Write requirements.txt if provided
        if requirements and requirements.strip():
            req_file = os.path.join(project_dir, "requirements.txt")
            with open(req_file, "w") as f:
                f.write(requirements)
            logs.append(f"Wrote requirements to: {req_file}")
            try:
                # Install dependencies as the current user
                result = subprocess.run(
                    ["python3", "-m", "pip", "install", "--user", "--no-cache-dir", "-r", req_file],
                    check=True,
                    capture_output=True,
                    text=True,
                    env={"HOME": "/home/appuser", "PATH": os.environ.get("PATH")}
                )
                logs.append("Installed dependencies successfully:")
                logs.append(result.stdout)
                if result.stderr:
                    logs.append("Dependency installation warnings:")
                    logs.append(result.stderr)
            except subprocess.CalledProcessError as e:
                logs.append("Failed to install dependencies:")
                logs.append(e.stderr)
                return render_template_string(HTML_TEMPLATE, error=f"Failed to install dependencies: {escape(e.stderr)}", logs="\n".join(logs))

        # Create a minimal pyproject.toml for BeeWare
        pyproject_content = f"""
[tool.briefcase]
project_name = "{app_name}"
bundle = "com.example"
version = "0.0.1"
description = "A Python app converted to APK"
license = "MIT"

[tool.briefcase.app.{app_name}]
formal_name = "{app_name}"
icon = ""
sources = ["src/{app_name}"]

[tool.briefcase.app.{app_name}.android]
build_tool = "gradle"
"""
        if requirements and requirements.strip():
            pyproject_content += f"""
requirements = [{', '.join(f'"{line.strip()}"' for line in requirements.splitlines() if line.strip())}]
"""
        pyproject_file = os.path.join(project_dir, "pyproject.toml")
        with open(pyproject_file, "w") as f:
            f.write(pyproject_content)
        logs.append(f"Wrote pyproject.toml to: {pyproject_file}")

        try:
            # Change to project directory
            os.chdir(project_dir)
            logs.append(f"Changed working directory to: {project_dir}")

            # Verify Briefcase installation
            briefcase_version = subprocess.run(
                ["briefcase", "--version"],
                capture_output=True,
                text=True,
                check=True
            ).stdout.strip()
            logs.append(f"Briefcase version: {briefcase_version}")

            # Log environment variables for debugging
            logs.append(f"Environment PATH: {os.environ.get('PATH')}")
            logs.append(f"Android SDK Home: {os.environ.get('ANDROID_HOME')}")
            logs.append(f"Android SDK Root: {os.environ.get('ANDROID_SDK_ROOT')}")
            logs.append(f"Java Home: {os.environ.get('JAVA_HOME', 'Not set')}")

            # Verify Android SDK tools
            try:
                sdkmanager_version = subprocess.run(
                    ["sdkmanager", "--version"],
                    capture_output=True,
                    text=True,
                    check=True
                ).stdout.strip()
                logs.append(f"sdkmanager version: {sdkmanager_version}")
            except subprocess.CalledProcessError as e:
                logs.append("Failed to verify sdkmanager version:")
                logs.append(e.stderr)
                return render_template_string(HTML_TEMPLATE, error="Failed to verify Android SDK tools.", logs="\n".join(logs))

            # Verify Java installation
            try:
                java_version = subprocess.run(
                    ["java", "-version"],
                    capture_output=True,
                    text=True,
                    check=True
                ).stderr.strip()  # java -version outputs to stderr
                logs.append(f"Java version: {java_version}")
            except subprocess.CalledProcessError as e:
                logs.append("Failed to verify Java version:")
                logs.append(e.stderr)
                return render_template_string(HTML_TEMPLATE, error="Failed to verify Java installation.", logs="\n".join(logs))

            # Ensure Android SDK licenses are accepted
            try:
                logs.append("Ensuring Android SDK licenses are accepted...")
                result_licenses = subprocess.run(
                    ["sdkmanager", "--licenses"],
                    input="y\n" * 10,  # Accept all licenses
                    capture_output=True,
                    text=True,
                    check=True,
                    env={
                        "HOME": "/home/appuser",
                        "PATH": os.environ.get("PATH"),
                        "ANDROID_HOME": "/opt/android-sdk",
                        "ANDROID_SDK_ROOT": "/opt/android-sdk",
                        "JAVA_HOME": "/usr/lib/jvm/java-17-openjdk-amd64"
                    }
                )
                logs.append("License acceptance output:")
                logs.append(result_licenses.stdout)
                if result_licenses.stderr:
                    logs.append("License acceptance warnings/errors:")
                    logs.append(result_licenses.stderr)
            except subprocess.CalledProcessError as e:
                logs.append("Failed to accept Android SDK licenses:")
                logs.append(f"Return code: {e.returncode}")
                logs.append(f"Stdout: {e.stdout}")
                logs.append(f"Stderr: {e.stderr}")
                return render_template_string(HTML_TEMPLATE, error="Failed to accept Android SDK licenses.", logs="\n".join(logs))

            # Run Briefcase create with verbose output and debug logging
            logs.append("Running Briefcase create command...")
            env = {
                "HOME": "/home/appuser",
                "PATH": os.environ.get("PATH"),
                "ANDROID_HOME": "/opt/android-sdk",
                "ANDROID_SDK_ROOT": "/opt/android-sdk",
                "JAVA_HOME": "/usr/lib/jvm/java-17-openjdk-amd64"
            }
            try:
                result_create = subprocess.run(
                    ["briefcase", "create", "android", "-v", "--no-input"],
                    check=True,
                    capture_output=True,
                    text=True,
                    env=env
                )
                logs.append("Briefcase create output:")
                logs.append(result_create.stdout)
                if result_create.stderr:
                    logs.append("Briefcase create warnings/errors:")
                    logs.append(result_create.stderr)
            except subprocess.CalledProcessError as e:
                logs.append("Briefcase create failed with error:")
                logs.append(f"Return code: {e.returncode}")
                logs.append(f"Stdout: {e.stdout}")
                logs.append(f"Stderr: {e.stderr}")
                return render_template_string(HTML_TEMPLATE, error=f"Briefcase create failed: {escape(e.stderr or e.stdout)}", logs="\n".join(logs))
            except Exception as e:
                logs.append(f"Unexpected error during Briefcase create: {str(e)}")
                return render_template_string(HTML_TEMPLATE, error=f"Unexpected error: {str(e)}", logs="\n".join(logs))

            # Run Briefcase build
            logs.append("Running Briefcase build command...")
            try:
                result_build = subprocess.run(
                    ["briefcase", "build", "android", "-v", "--no-input"],
                    check=True,
                    capture_output=True,
                    text=True,
                    env=env
                )
                logs.append("Briefcase build output:")
                logs.append(result_build.stdout)
                if result_build.stderr:
                    logs.append("Briefcase build warnings/errors:")
                    logs.append(result_build.stderr)
            except subprocess.CalledProcessError as e:
                logs.append("Briefcase build failed with error:")
                logs.append(f"Return code: {e.returncode}")
                logs.append(f"Stdout: {e.stdout}")
                logs.append(f"Stderr: {e.stderr}")
                return render_template_string(HTML_TEMPLATE, error=f"Briefcase build failed: {escape(e.stderr or e.stdout)}", logs="\n".join(logs))

            # Locate the generated APK
            apk_file = "app-debug.apk"
            # Try the default path
            apk_dir = os.path.join(project_dir, "build", app_name, "android", "gradle", "app", "build", "outputs", "apk", "debug")
            apk_path = os.path.join(apk_dir, apk_file)
            logs.append(f"Checking for APK at: {apk_path}")

            # If not found, search for app-debug.apk in the project directory
            if not os.path.exists(apk_path):
                logs.append(f"APK not found at: {apk_path}")
                apk_files = glob.glob(os.path.join(project_dir, "**", "app-debug.apk"), recursive=True)
                if apk_files:
                    apk_path = apk_files[0]
                    logs.append(f"Found APK at alternative path: {apk_path}")
                else:
                    logs.append("Error: APK not found in project directory.")
                    return render_template_string(HTML_TEMPLATE, error="APK not found after build.", logs="\n".join(logs))

            # Move APK to persistent directory
            persistent_dir = "/persistent_storage"
            os.makedirs(persistent_dir, exist_ok=True)
            final_apk_path = os.path.join(persistent_dir, f"{app_name}.apk")
            shutil.copy(apk_path, final_apk_path)
            logs.append(f"Copied APK to: {final_apk_path}")

            return render_template_string(HTML_TEMPLATE, apk_path=f"{app_name}.apk", logs="\n".join(logs))

        except subprocess.CalledProcessError as e:
            logs.append("Build failed with the following error:")
            logs.append(e.stderr)
            return render_template_string(HTML_TEMPLATE, error=f"Build failed: {escape(e.stderr)}", logs="\n".join(logs))

@app.route("/download/<filename>")
def download(filename):
    try:
        file_path = os.path.join("/persistent_storage", filename)
        return send_file(file_path, as_attachment=True)
    except FileNotFoundError:
        return render_template_string(HTML_TEMPLATE, error="APK file not found for download.")

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