package manifests

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// The tree's manifests are ones a judge can read, and no module is named twice. A row is a catalogue of its own: a
// manifest that is no JSON and two manifests of one module are refused, naming the file; a manifest with a field this
// check does not know is not (it judges nothing: the checker does, ADR 0578 §2). The catalogue itself passes.
func TestEveryManifestDecodesAndNamesOneModule(t *testing.T) {
	for _, row := range []struct {
		name    string
		files   map[string]string
		refused string
	}{
		{name: "a manifest the judge can read", files: map[string]string{"a": `{"module":"a","version":"1"}`}},
		{name: "a field no part knows is the judge's to refuse", files: map[string]string{"a": `{"module":"a","version":"1","unheard":true}`}},
		{name: "bytes that are no manifest", files: map[string]string{"a": `{"module":`}, refused: "modules/a/module.json"},
		{name: "two manifests of one module", files: map[string]string{"a": `{"module":"x","version":"1"}`, "b": `{"module":"x","version":"1"}`},
			refused: "two manifests name one module"},
	} {
		root := t.TempDir()
		for dir, manifest := range row.files {
			if err := os.MkdirAll(filepath.Join(root, "modules", dir), 0o755); err != nil {
				t.Fatal(err)
			}
			if err := os.WriteFile(filepath.Join(root, "modules", dir, "module.json"), []byte(manifest), 0o644); err != nil {
				t.Fatal(err)
			}
		}
		got, err := Problems(root)
		if err != nil {
			t.Fatal(err)
		}
		joined := strings.Join(got, "\n")
		if (row.refused == "") != (len(got) == 0) || !strings.Contains(joined, row.refused) {
			t.Errorf("%s: refused %q, want %q", row.name, joined, row.refused)
		}
	}
	real, err := Problems(filepath.Join("..", ".."))
	if err != nil {
		t.Fatal(err)
	}
	if len(real) != 0 {
		t.Fatalf("the catalogue holds manifests no judge can read:\n%s", strings.Join(real, "\n"))
	}
}