import argparse
import os
import shutil
import subprocess
import sys
from pathlib import Path


PROJECT_ROOT = Path(__file__).resolve().parents[1]
BLENDER_SCRIPTS = (
    "build.py",
    "validate.py",
    "validate_mesh_plane.py",
    "validate_cutout.py",
)


def project_env_value(name, path=None):
    env_path = path or PROJECT_ROOT / ".env"
    if not env_path.is_file():
        return None
    for raw_line in env_path.read_text(encoding="utf-8").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#"):
            continue
        if line.startswith("export "):
            line = line.removeprefix("export ").lstrip()
        key, separator, value = line.partition("=")
        if separator and key.strip() == name:
            value = value.strip()
            if len(value) >= 2 and value[0] == value[-1] and value[0] in "\"'":
                value = value[1:-1]
            return value or None
    return None


def blender_path(explicit=None):
    candidate = (
        explicit
        or os.environ.get("BLENDER_BIN")
        or project_env_value("BLENDER_BIN")
        or shutil.which("blender")
    )
    if not candidate:
        raise RuntimeError(
            "Blender not found: pass --blender, set BLENDER_BIN, add it to .env, "
            "or add blender to PATH"
        )
    path = Path(candidate).expanduser()
    if not path.is_file():
        raise RuntimeError(f"Blender executable does not exist: {path}")
    return path


def run(command):
    print("+", subprocess.list2cmdline([str(part) for part in command]), flush=True)
    subprocess.run(command, cwd=PROJECT_ROOT, check=True)


def main():
    parser = argparse.ArgumentParser(
        description="Build and validate O_AnyImage.blend.",
    )
    parser.add_argument(
        "--blender",
        help="Blender executable; overrides BLENDER_BIN, .env, and PATH.",
    )
    parser.add_argument(
        "--skip-tests",
        action="store_true",
        help="Skip the Python test suite.",
    )
    options = parser.parse_args()
    executable = blender_path(options.blender)

    for script_name in BLENDER_SCRIPTS:
        run(
            (
                executable,
                "--factory-startup",
                "--background",
                "--python",
                PROJECT_ROOT / "tools" / "node_assets" / script_name,
            )
        )
    if not options.skip_tests:
        run((sys.executable, "-m", "pytest"))


if __name__ == "__main__":
    main()