#!/usr/bin/env python3
"""Junta os textos de licenca dos modulos Go que entram no .wasm (go list -deps) e o da biblioteca padrao do Go.

  python3 -I licenses.py <GOROOT> <saida.txt> <titulo> < lista

A lista (stdin) tem uma linha "caminho|versao|pasta" por modulo, que o go_licenses de common.sh tira do `go list -deps`. Para cada
modulo, todo arquivo LICENSE*/COPYING*/NOTICE*/PATENTS* da raiz do modulo entra, com cabecalho e sem mudanca. Modulo sem nenhum
desses arquivos e avisado (a build falha, para alguem olhar). Ordem alfabetica: a saida e igual a cada execucao.
"""
import os
import re
import sys

goroot, out, title = sys.argv[1:4]
mods = sorted({tuple(l.rstrip("\n").split("|")) for l in sys.stdin if l.strip()})
pat = re.compile(r"^(LICEN[SC]E|COPYING|NOTICE|PATENTS)([-._].*)?$", re.I)

parts = [title + " - licences of the Go libraries compiled into the WebAssembly module\n" + "=" * 70 + "\n\n"
         "Generated by Builds/go-ebiten/licenses.py from `go list -deps` of the build (GOOS=js GOARCH=wasm): the Go runtime and standard\n"
         "library, then every Go module that has a package in the binary, each with the licence files at the root of the module, unchanged.\n"]
missing = []


def add(name, version, files):
    parts.append("\n" + "=" * 78 + "\n" + name + (" " + version if version else "") + "\n" + "=" * 78 + "\n")
    for path in files:
        parts.append("\n--- " + os.path.basename(path) + " ---\n\n")
        with open(path, encoding="utf-8", errors="replace") as f:
            parts.append(f.read().rstrip("\n") + "\n")


add("Go runtime and standard library", "", [os.path.join(goroot, "LICENSE"), os.path.join(goroot, "PATENTS")])
for name, version, d in mods:
    files = sorted(os.path.join(d, f) for f in os.listdir(d) if pat.match(f) and os.path.isfile(os.path.join(d, f)))
    if not files:
        missing.append(name)
        continue
    add(name, version, files)
if missing:
    print("Sem arquivo de licenca na raiz do modulo: " + ", ".join(missing), file=sys.stderr)
with open(out, "w", encoding="utf-8") as f:
    f.write("".join(parts))
print(f"{len(mods)} modulos, {len(missing)} sem licenca na raiz")
if missing and os.environ.get("ALLOW_MISSING_LICENSES") != "1":
    sys.exit(1)