"""
PyInstaller build script for Label Printer GUI
Run this to create a standalone Windows executable.

IMPORTANT: This script MUST be run on Windows to generate a Windows .exe file.
If run on Linux/macOS, it will create a Linux/macOS binary that won't work on Windows.

To build for Windows:
1. Copy this project to a Windows machine
2. Install dependencies: pip install -r requirements_windows.txt
3. Run this script: python build_exe.py
4. The Windows .exe will be created in the dist/ folder

Printing method
---------------
SumatraPDF is bundled inside the exe and used for all printing.
It sends the PDF at its exact 35x25 mm page size via -print-settings noscale.
No GhostScript installation required on the build or target machine.
"""

import os
import sys
import subprocess

# Get the current directory
script_dir = os.path.dirname(os.path.abspath(__file__))


def check_conf_folder():
    """
    Verify that required files are present in the conf\ folder before building.
    Returns True if all required files exist, False otherwise.
    """
    required = [
        os.path.join('conf', 'SumatraPDF.exe'),
        os.path.join('conf', 'SumatraPDF-settings.txt'),
        os.path.join('conf', 'label_template_ok.svg'),
        os.path.join('conf', 'label_template_nok.svg'),
        os.path.join('conf', 'label_template.svg'),
    ]
    all_ok = True
    for f in required:
        if os.path.exists(f):
            print(f"  OK: {f}")
        else:
            print(f"  MISSING: {f}")
            all_ok = False
    return all_ok


if __name__ == '__main__':
    print("=" * 60)
    print("Label Printer GUI - PyInstaller Build")
    print("=" * 60)

    # Change to script directory so relative paths work
    os.chdir(script_dir)

    # Step 1: Verify conf\ folder contents
    print("\n[1/2] Checking conf\\ folder...")
    if not check_conf_folder():
        print("\nERROR: One or more required conf\\ files are missing.")
        print("Place SumatraPDF.exe and the SVG templates in the conf\\ folder, then retry.")
        sys.exit(1)

    # Step 2: Build with PyInstaller using the handcrafted spec file.
    print("\n[2/2] Building standalone executable via LabelPrinter.spec...")
    print("This may take a few minutes...\n")

    try:
        result = subprocess.run(
            ['pyinstaller', 'LabelPrinter.spec',
             '--distpath=./dist', '--workpath=./build', '-y'],
            check=True,
        )

        print("\n" + "=" * 60)
        print("Build Complete!")
        print("=" * 60)
        print("\nExecutable location: ./dist/LabelPrinter.exe")
        print("\nBundled components:")
        print("  - SumatraPDF  (primary printing, noscale 35x25 mm)")
        print("  - SVG templates, conf files")
        print("\nYou can now:")
        print("  1. Double-click LabelPrinter.exe to run")
        print("  2. Copy the dist\\ folder to target machines")
        print("  3. No extra software installation required on target machines")
        print("\nNote: First run may take a moment as Kivy initializes")
    except subprocess.CalledProcessError as e:
        print("\n" + "=" * 60)
        print("Build Failed!")
        print("=" * 60)
        print(f"\nError code: {e.returncode}")
        print("\nPlease check the error messages above for details.")
        sys.exit(1)
    except Exception as e:
        print(f"\nFatal error: {e}")
        sys.exit(1)