"""Convert a CCS C2000 OUT to SCI8 HEX/BIN and seal its pre-build identity.

Uses only the standard library, TI hex2000 and the shared identity module.
No network, SETGUI, or project-specific paths are required.
"""
from __future__ import annotations

import argparse
import json
from pathlib import Path
import re
import subprocess
import tempfile

from identity import archive_build, seal, verify


def postbuild(compiler: Path, build_dir: Path, artifact: str,
              metadata: Path, output: Path, export: Path = None) -> Path:
    # CCS may include the configured output directory in this macro.
    # Resolve the input separately; output filenames must use only its basename.
    artifact_path = Path(artifact)
    if not artifact or artifact_path.name in ("", ".", ".."):
        raise ValueError("artifact must name an OUT file without its extension")
    artifact = artifact_path.name
    if any(c in artifact for c in '\\/:*?"<>|'):
        raise ValueError("invalid artifact file base name")
    source_base = (artifact_path if artifact_path.is_absolute()
                   else build_dir / artifact_path)
    source = Path(str(source_base) + ".out").resolve()
    tool = compiler.resolve() / "bin" / "hex2000.exe"
    if not tool.is_file():
        raise FileNotFoundError(f"C2000 Hex Utility not found: {tool}")
    if not source.is_file():
        raise FileNotFoundError(f"compiled OUT not found: {source}")
    metadata = metadata.resolve()
    settings = json.loads(metadata.read_text(encoding="utf-8"))
    build_id = settings["build_id"]
    if not isinstance(build_id, str) or not re.fullmatch(r"[0-9a-fA-F]{8}|[0-9a-fA-F]{7}\+|NOGIT000", build_id):
        raise ValueError("invalid pre-build identity; run precompile before building")
    if build_id == "NOGIT000":
        print("[firmware-build] Git identity unavailable: using NOGIT000")
    output = output.resolve()
    output.mkdir(parents=True, exist_ok=True)
    # Keep failed conversions and incomplete manifests out of the final folder.
    with tempfile.TemporaryDirectory(prefix=".firmware-", dir=output) as temporary:
        stage = Path(temporary)
        hex_image = stage / (artifact + ".hex")
        bin_image = stage / (artifact + "_" + build_id + ".bin")
        for image, mode in ((hex_image, "-i"), (bin_image, "-b")):
            subprocess.run([str(tool), str(source), "-boot", "-sci8",
                            "-map", str(image.with_suffix(image.suffix + ".map")),
                            "-o", str(image), mode], check=True)
            if not image.is_file() or not image.stat().st_size:
                raise ValueError(f"hex2000 produced no image: {image}")
        seal(bin_image, metadata)
        verify(bin_image, bin_image.with_suffix(bin_image.suffix + ".manifest.json"))
        for item in stage.iterdir():
            item.replace(output / item.name)
    result = output / bin_image.name
    archive_build(result, metadata, output, (
        output / hex_image.name,
        output / (hex_image.name + ".map"),
        output / (bin_image.name + ".map")), export=export)
    print(f"[firmware-build] BIN: {result}")
    print(f"[firmware-build] Manifest: {result}.manifest.json")
    print(f"[firmware-build] SHA-256: {result}.sha256")
    return result


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    for name in ("compiler", "build-dir", "metadata", "output"):
        parser.add_argument("--" + name, type=Path, required=True)
    parser.add_argument("--artifact", required=True)
    parser.add_argument("--export", type=Path)
    try:
        postbuild(**vars(parser.parse_args()))
    except (OSError, ValueError, KeyError, TypeError, subprocess.CalledProcessError) as error:
        parser.exit(1, f"[firmware-build] ERROR: {error}\n")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())