package main

import (
	"os"
	"strings"
	"testing"
)

// The build agent and the toolchain images are gone (novox/hq ADR 0524 §5, issue 1295 and E6 of milestone R4g): no text a module
// can show names them. Where the word stands for a reason that is another lane's or still waits for its change, buildagent-allowed
// names the module's directory with that reason and the date it is dated from; the list only shrinks: a directory on it that no
// longer names the word is refused, so the line is taken out.
var gone = []string{"build-agent", "build agent", "toolchain image"}

func allowedModules(t *testing.T) map[string]string {
	t.Helper()
	raw, err := os.ReadFile("buildagent-allowed")
	if err != nil {
		t.Fatal(err)
	}
	out := map[string]string{}
	for _, line := range strings.Split(string(raw), "\n") {
		entry, why, _ := strings.Cut(line, "#")
		if entry = strings.TrimSpace(entry); entry != "" && !strings.HasPrefix(line, "#") {
			if strings.TrimSpace(why) == "" {
				t.Fatalf("%q is allowed without a reason", entry)
			}
			out[entry] = strings.TrimSpace(why)
		}
	}
	return out
}

func TestNoTextOfTheCatalogueNamesTheBuildAgentOutsideTheModulesAllowed(t *testing.T) {
	texts, _, err := collect("../..")
	if err != nil {
		t.Fatal(err)
	}
	allowed := allowedModules(t)
	seen := map[string]bool{}
	for _, f := range check(gone, texts) {
		module := f
		if rest, ok := strings.CutPrefix(f, "modules/"); ok {
			module = "modules/" + strings.SplitN(rest, "/", 2)[0]
		}
		if _, ok := allowed[module]; ok {
			seen[module] = true
			continue
		}
		t.Errorf("%s (the build agent and the toolchain images are gone: say what stands in their place)", f)
	}
	for module, why := range allowed {
		if !seen[module] {
			t.Errorf("buildagent-allowed names %s (%s), which names the word no more: take the line out, so it cannot come back", module, why)
		}
	}
}