//go:build integration

package buildstep

import (
	"context"
	"strings"
	"testing"

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

// On a real repository shaped like mesh-sdk (novox/hq ADR 0499 clauses 2 and 6), a commit touching only the Go package
// leaves the TypeScript package's tree value equal, and a commit touching its source changes it; a module that names no
// path keeps its directory's tree id.
func TestAGoOnlyCommitLeavesTheNamedTreeEqualOnRealGit(t *testing.T) {
	repo := t.TempDir()
	realGit(t, repo, "init", "-q", "-b", "main")
	writeFile(t, repo, "module.json", `{"module":"mesh-sdk","version":"1","build":{"artifacts":[`+
		`{"name":"lib","kind":"package","language":"typescript","paths":["src","test","package.json","package-lock.json","tsconfig.json"]}]}}`)
	writeFile(t, repo, "src/index.ts", "export const a = 1\n")
	writeFile(t, repo, "test/a.test.ts", "// a\n")
	writeFile(t, repo, "package.json", "{}\n")
	writeFile(t, repo, "package-lock.json", "{}\n")
	writeFile(t, repo, "tsconfig.json", "{}\n")
	writeFile(t, repo, "go/delivery/x.go", "package delivery\n")
	writeFile(t, repo, "other/module.json", `{"module":"other","version":"1"}`)
	writeFile(t, repo, "other/a.txt", "a\n")
	commit := func(msg string) string {
		realGit(t, repo, "add", "-A")
		realGit(t, repo, "commit", "-q", "-m", msg)
		return realGit(t, repo, "rev-parse", "HEAD")
	}
	trees := func(c string) map[string]ModuleTree {
		got, err := ModuleTrees(context.Background(), forgekey.ExecRunner, nil, repo, c)
		if err != nil {
			t.Fatal(err)
		}
		return got
	}
	first := trees(commit("first"))
	if !strings.HasPrefix(first["."].Tree, "named:") || len(first["."].Paths) != 5 {
		t.Fatalf("the root module was not narrowed: %+v", first["."])
	}
	if want := realGit(t, repo, "rev-parse", "HEAD:other"); first["other"].Tree != want || first["other"].Paths != nil {
		t.Fatalf("a module naming no path: %+v, want its directory's tree %s", first["other"], want)
	}

	writeFile(t, repo, "go/delivery/x.go", "package delivery\n\nconst B = 2\n")
	goOnly := trees(commit("go only"))
	if goOnly["."].Tree != first["."].Tree {
		t.Fatalf("a Go-only commit changed the TypeScript package's tree: %s, was %s", goOnly["."].Tree, first["."].Tree)
	}

	writeFile(t, repo, "src/index.ts", "export const a = 2\n")
	src := trees(commit("src"))
	if src["."].Tree == first["."].Tree {
		t.Fatal("a commit to src/ left the TypeScript package's tree equal")
	}
	if src["."].Paths["src"] != realGit(t, repo, "rev-parse", "HEAD:src") {
		t.Fatalf("the object of src is %s, git says %s", src["."].Paths["src"], realGit(t, repo, "rev-parse", "HEAD:src"))
	}
}