package bootstrap

import (
	"context"
	"strings"
	"testing"
)

// An installer that carries a builder and was told nothing refuses, and says what is missing.
//
// **Exercised rather than assumed.** This is the refusal that stands between a person and a
// machine left holding a store, a broker and no control plane — the failure the whole preflight
// exists to prevent — and a refusal nothing tests is a refusal nobody has read.
func TestAnInstallerWithNothingToBuildRefuses(t *testing.T) {
	err := Source{}.Check()
	if err == nil {
		t.Fatal("a source naming no repository was accepted; nothing would have been built")
	}
	for _, want := range []string{"--source", "--source-ref"} {
		if !strings.Contains(err.Error(), want) {
			t.Errorf("the refusal does not name %s, so it does not say how to fix it: %v", want, err)
		}
	}
}

// A repository without a commit refuses too, because a branch is somebody else's moving target.
func TestABranchIsNotACommit(t *testing.T) {
	err := Source{Repository: "https://example.invalid/mesh-controller.git"}.Check()
	if err == nil {
		t.Fatal("a source with no ref was accepted; genesis would have built whatever a branch pointed at")
	}
	if !strings.Contains(err.Error(), "--source-ref") {
		t.Errorf("the refusal does not name the flag that fixes it: %v", err)
	}
}

// And a repository with a commit is enough.
func TestARepositoryAndACommitIsEnough(t *testing.T) {
	if err := (Source{Repository: "https://example.invalid/mesh-controller.git", Ref: "a1b2c3d4"}).Check(); err != nil {
		t.Fatalf("a repository and a commit were refused: %v", err)
	}
}

// **The build hands over the manifest, and the installer registers that one.** The control plane
// used to have two manifests — one at the root of its repository, which the mesh reads whenever
// it rebuilds the control plane from source, and a copy in the catalogue, which genesis read — and
// nothing kept them equal (novox/hq 04-ISSUES/072). The builder already reports the manifest it
// built, artifact resolved to the image; genesis takes it from there and reads no second copy.
func TestTheBuildHandsOverTheManifestTheMeshWillHold(t *testing.T) {
	manifest := `{"module":"mesh-controller","version":"1","resources":[` +
		`{"id":"server","type":"container","name":"mesh-controller","image":"` + builtImage + `"}]}`
	runtime := &asked{answer: func(string, []string) (string, error) {
		return `{"module":"mesh-controller","commit":"a1b2c3d4","manifest":` + manifest +
			`,"made":[{"name":"server","kind":"image","reference":"` + builtImage + `"}]}` + "\n", nil
	}}
	built, err := BuildControlPlane(context.Background(), runtime.run, "mesh-builder:test",
		Source{Repository: "https://example.invalid/mesh-controller.git", Ref: "a1b2c3d4"}, false, func(string) {})
	if err != nil {
		t.Fatal(err)
	}
	if built.Image != builtImage {
		t.Errorf("the built image is %q", built.Image)
	}
	if string(built.Manifest) != manifest {
		t.Errorf("the manifest handed over is not the one the builder reported:\n%s", built.Manifest)
	}
}

// A result without a manifest is a build the installer cannot finish, and it is refused beside the
// builder that said it rather than at step 9 with a message about a missing file.
func TestABuildReportingNoManifestIsRefused(t *testing.T) {
	runtime := &asked{answer: func(string, []string) (string, error) {
		return `{"module":"mesh-controller","commit":"a1b2c3d4",` +
			`"made":[{"name":"server","kind":"image","reference":"` + builtImage + `"}]}`, nil
	}}
	_, err := BuildControlPlane(context.Background(), runtime.run, "mesh-builder:test",
		Source{Repository: "https://example.invalid/mesh-controller.git", Ref: "a1b2c3d4"}, false, func(string) {})
	if err == nil || !strings.Contains(err.Error(), "no manifest") {
		t.Fatalf("a build reporting no manifest was accepted, or refused for another reason: %v", err)
	}
}

// And a manifest that does not name the image the build produced describes some other build.
func TestABuildWhoseManifestNamesAnotherImageIsRefused(t *testing.T) {
	runtime := &asked{answer: func(string, []string) (string, error) {
		return `{"module":"mesh-controller","commit":"a1b2c3d4","manifest":{"module":"mesh-controller",` +
			`"resources":[{"id":"server","type":"container","image":"sha256:` + strings.Repeat("9", 64) + `"}]},` +
			`"made":[{"name":"server","kind":"image","reference":"` + builtImage + `"}]}`, nil
	}}
	_, err := BuildControlPlane(context.Background(), runtime.run, "mesh-builder:test",
		Source{Repository: "https://example.invalid/mesh-controller.git", Ref: "a1b2c3d4"}, false, func(string) {})
	if err == nil || !strings.Contains(err.Error(), "does not name that image") {
		t.Fatalf("a manifest naming another image was accepted, or refused for another reason: %v", err)
	}
}