package buildstep

import (
	"context"
	"strings"
	"testing"

	"git.novox.be/novox/mesh-sdk/go/delivery"
	"git.novox.be/novox/mesh-sdk/go/forgekey"
)

// A module whose every artifact names its paths takes its tree from them (novox/hq ADR 0499 clause 2): ModuleTrees asks
// git for each named path's object at the commit, keeps them in Paths and answers their delivery.NamedTree as Tree; a
// module naming none keeps its directory's tree, as before.
func TestModuleTreesNarrowsAModuleWhoseArtifactsNameTheirPaths(t *testing.T) {
	root := t.TempDir()
	sdk := `{"module":"mesh-sdk","version":"1","build":{"artifacts":[{"name":"lib","kind":"package","language":"typescript","paths":["src","package.json"]}]}}`
	writeTreeFile(t, root, "module.json", sdk)
	writeTreeFile(t, root, "modules/b/module.json", `{"module":"b","version":"1"}`)
	merge := strings.Repeat("c", 40)
	var lsTree []string
	run := func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
		switch args[2] {
		case "ls-files":
			return forgekey.Ran{Stdout: "module.json\nmodules/b/module.json\n"}
		case "rev-parse":
			return forgekey.Ran{Stdout: "tree-of-" + args[3] + "\n"}
		case "ls-tree":
			lsTree = append(lsTree, strings.Join(args[4:], " "))
			return forgekey.Ran{Stdout: "100644 blob " + strings.Repeat("b", 40) + "\tpackage.json\x00" +
				"040000 tree " + strings.Repeat("a", 40) + "\tsrc\x00"}
		}
		return forgekey.Ran{Status: 1, Stderr: "unexpected " + args[2]}
	}
	got, err := ModuleTrees(context.Background(), run, nil, root, merge)
	if err != nil {
		t.Fatal(err)
	}
	paths := map[string]string{"src": strings.Repeat("a", 40), "package.json": strings.Repeat("b", 40)}
	want, _ := delivery.NamedTree(hexOf(sdk), paths)
	if g := got["."]; g.Tree != want || len(g.Paths) != 2 || g.Paths["src"] != paths["src"] || g.Paths["package.json"] != paths["package.json"] {
		t.Fatalf("the root module = %+v, want tree %s and paths %v", g, want, paths)
	}
	if len(lsTree) != 1 || lsTree[0] != merge+" -- package.json src" {
		t.Fatalf("git ls-tree ran as %v", lsTree)
	}
	if g := got["modules/b"]; g.Tree != "tree-of-"+merge+":modules/b" || g.Paths != nil {
		t.Fatalf("a module naming no path was narrowed: %+v", g)
	}
}

// A named path absent at the commit fails the answer, naming the module and the path: a tree computed without it would
// pin a build source that does not exist.
func TestModuleTreesFailsNamingANamedPathAbsentAtTheCommit(t *testing.T) {
	root := t.TempDir()
	writeTreeFile(t, root, "modules/a/module.json", `{"module":"a","version":"1","build":{"artifacts":[{"name":"lib","kind":"package","language":"typescript","paths":["src","gone"]}]}}`)
	run := func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
		switch args[2] {
		case "ls-files":
			return forgekey.Ran{Stdout: "modules/a/module.json\n"}
		case "rev-parse":
			return forgekey.Ran{Stdout: "t\n"}
		case "ls-tree":
			if strings.Join(args[4:], " ") != strings.Repeat("c", 40)+" -- modules/a/gone modules/a/src" {
				return forgekey.Ran{Status: 1, Stderr: "wrong arguments " + strings.Join(args[3:], " ")}
			}
			return forgekey.Ran{Stdout: "040000 tree " + strings.Repeat("a", 40) + "\tmodules/a/src\x00"}
		}
		return forgekey.Ran{Status: 1}
	}
	_, err := ModuleTrees(context.Background(), run, nil, root, strings.Repeat("c", 40))
	if err == nil || !strings.Contains(err.Error(), `"gone"`) || !strings.Contains(err.Error(), "modules/a") {
		t.Fatalf("an absent named path gave %v", err)
	}
}