#!/usr/bin/env python3
"""Lista os crates Rust que entram no .wasm (dependencias normais, a partir do pacote raiz) e junta o texto das
licencas de cada um. Uso: cargo metadata ... | rust-licenses.py <pacote-raiz> <saida.txt> [<licencas-extras.txt>]
Falha se algum crate nao tiver arquivo de licenca ou se a expressao de licenca nao permitir uso comercial livre."""
import json, os, sys, glob

root_name, out = sys.argv[1], sys.argv[2]
extra = sys.argv[3] if len(sys.argv) > 3 else None
m = json.load(sys.stdin)
pk = {p["id"]: p for p in m["packages"]}
nodes = {n["id"]: n for n in m["resolve"]["nodes"]}
root = next(i for i, p in pk.items() if p["name"] == root_name and p["source"] is None)
seen, stack = set(), [root]
while stack:
    i = stack.pop()
    if i in seen:
        continue
    seen.add(i)
    for d in nodes[i]["deps"]:
        if any(k["kind"] is None for k in d["dep_kinds"]):
            stack.append(d["pkg"])
lines = []
bad = []
for i in sorted(seen, key=lambda i: (pk[i]["name"], pk[i]["version"])):
    p = pk[i]
    if p["source"] is None:
        continue  # crates do proprio repositorio do jogo (MIT, LICENSE.txt do jogo)
    lic = p["license"] or ""
    d = os.path.dirname(p["manifest_path"])
    files = sorted(f for f in glob.glob(os.path.join(d, "*")) if os.path.basename(f).upper().startswith(("LICENSE", "LICENCE", "COPYING", "UNLICENSE", "NOTICE")) and os.path.isfile(f))
    if any(t in lic for t in ("GPL", "AGPL", "LGPL", "MPL", "CC-BY-NC")):
        bad.append((p["name"], lic))
    lines.append("=" * 78)
    lines.append("%s %s  (%s)" % (p["name"], p["version"], lic or "see files"))
    lines.append("=" * 78)
    if not files:
        if not lic:
            bad.append((p["name"], "sem licenca"))
        lines.append("(no license file in the published crate; license expression above)")
    for f in files:
        lines.append("--- %s" % os.path.basename(f))
        lines.append(open(f, encoding="utf-8", errors="replace").read().rstrip())
        lines.append("")
if bad:
    sys.exit("licencas a conferir: %r" % bad)
with open(out, "w", encoding="utf-8") as o:
    o.write("Rust crates compiled into the WebAssembly module (normal dependencies only), with the license texts\n"
            "published in each crate. %d crates.\n\n" % sum(1 for l in lines if l.startswith("=" * 78)) if False else
            "Rust crates compiled into the WebAssembly module (normal dependencies only), with the license texts\npublished in each crate.\n\n")
    if extra:
        o.write(open(extra, encoding="utf-8").read().rstrip() + "\n\n")
    o.write("\n".join(lines) + "\n")
print("crates:", sum(1 for l in lines if l.startswith("=" * 78)) // 2)