#!/usr/bin/env python3
"""Package exactly pinned tracked source trees and record gitlink dependencies."""

import argparse, json, subprocess
from pathlib import Path


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--root", type=Path, required=True)
    ap.add_argument("--plan", type=Path, required=True)
    a = ap.parse_args()
    r = a.root.resolve()
    p = json.loads(a.plan.read_text())
    seen = set()
    for c in p["cells"]:
        name = c["project"]
        rev = c["source_revision"]
        repo = c["source_repository"]
        if name in seen or not repo or not rev:
            continue
        seen.add(name)
        src = r / "sources" / name
        if not src.exists():
            for cmd in [
                ["git", "init", "-q", str(src)],
                [
                    "git",
                    "-C",
                    str(src),
                    "remote",
                    "add",
                    "origin",
                    "https://github.com/" + repo + ".git",
                ],
                ["git", "-C", str(src), "fetch", "-q", "--depth", "1", "origin", rev],
                ["git", "-C", str(src), "checkout", "-q", "FETCH_HEAD"],
            ]:
                subprocess.run(cmd, check=True)
        actual = subprocess.check_output(
            ["git", "-C", str(src), "rev-parse", "HEAD"], text=True
        ).strip()
        assert actual == rev
        out = r / "staged/qualification-v2/sources" / name
        out.mkdir(parents=True, exist_ok=True)
        subprocess.run(
            [
                "git",
                "-C",
                str(src),
                "archive",
                "--format=tar.gz",
                "--output",
                str(out / "original.tar.gz"),
                "HEAD",
            ],
            check=True,
        )
        gitlinks = []
        for line in subprocess.check_output(
            ["git", "-C", str(src), "ls-tree", "-r", "HEAD"], text=True
        ).splitlines():
            meta, path = line.split("\t", 1)
            if meta.startswith("160000 "):
                gitlinks.append({"path": path, "commit": meta.split()[2]})
        (out / "provenance.json").write_text(
            json.dumps(
                {
                    "repository": repo,
                    "revision": rev,
                    "tracked_source_tree": True,
                    "gitlinks": gitlinks,
                    "note": "git archive contains tracked main-tree files. Gitlink content requires separate dependency fetching; preprocessed TUs preserve compiled expansions.",
                },
                indent=2,
            )
        )
        print(name, rev, flush=True)


if __name__ == "__main__":
    main()