"""Build a minimal, offline, hand-rolled Go module proxy tree, for
integration-testing the `go` module of id-configurator.

No network access and no Go toolchain is used: the module proxy protocol
(https://go.dev/ref/mod#module-proxy) only requires a handful of static
files, none of which embed the server's own base URL (unlike Composer/
npm/cargo), so this can be served directly by nginx with no rewriting.
"""

from __future__ import annotations

import io
import json
import pathlib
import zipfile

MODULE = "example.invalid/idconfiguratortestpkg"
VERSION = "v0.0.1"
OUT_DIR = pathlib.Path("/srv")
MARKER = "test-only module served by the id-configurator integration tests\n"

GO_MOD = f"module {MODULE}\n\ngo 1.21\n"


def build_zip() -> bytes:
    buffer = io.BytesIO()
    prefix = f"{MODULE}@{VERSION}"
    with zipfile.ZipFile(buffer, "w") as archive:
        archive.writestr(f"{prefix}/go.mod", GO_MOD)
        archive.writestr(f"{prefix}/marker.txt", MARKER)
    return buffer.getvalue()


def main() -> None:
    module_dir = OUT_DIR / MODULE / "@v"
    module_dir.mkdir(parents=True, exist_ok=True)
    (module_dir / "list").write_text(f"{VERSION}\n", encoding="utf-8")
    (module_dir / f"{VERSION}.info").write_text(
        json.dumps({"Version": VERSION, "Time": "2024-01-01T00:00:00Z"}),
        encoding="utf-8",
    )
    (module_dir / f"{VERSION}.mod").write_text(GO_MOD, encoding="utf-8")
    (module_dir / f"{VERSION}.zip").write_bytes(build_zip())


if __name__ == "__main__":
    main()