package manifests

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

	"git.novox.be/novox/mesh-sdk/go/catalogue"
)

// 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"))
	}
}

// No manifest of this catalogue claims the seat mesh-catalog: the indexer of the delivery holds it, and the module that
// held it before has dropped its claim (ADR 0604 §6). A row is a tree of its own: a manifest claiming it is named.
func TestNoManifestClaimsTheSeatMeshCatalog(t *testing.T) {
	claimants := func(root string) []string {
		files, err := filepath.Glob(filepath.Join(root, "modules", "*", "module.json"))
		if err != nil {
			t.Fatal(err)
		}
		var out []string
		for _, f := range files {
			raw, err := os.ReadFile(f)
			if err != nil {
				t.Fatal(err)
			}
			m, err := catalogue.Decode(raw)
			if err != nil {
				continue // Problems names it
			}
			for _, c := range m.Claims {
				if c.Name == "mesh-catalog" {
					out = append(out, m.Module)
				}
			}
		}
		return out
	}
	row := t.TempDir()
	if err := os.MkdirAll(filepath.Join(row, "modules", "a"), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(row, "modules", "a", "module.json"),
		[]byte(`{"module":"a","version":"1","claims":[{"name":"mesh-catalog","scope":"mesh"}]}`), 0o644); err != nil {
		t.Fatal(err)
	}
	if got := claimants(row); len(got) != 1 || got[0] != "a" {
		t.Fatalf("a manifest claiming the seat is named, got %v", got)
	}
	if got := claimants(filepath.Join("..", "..")); len(got) != 0 {
		t.Errorf("the catalogue's manifests %v claim the seat mesh-catalog: the indexer of the delivery holds it", got)
	}
}