package provisioner

import (
	"strings"
	"testing"
)

// TestRegistryPrefix_DefaultsToGHCR pins the OSS-default behavior. If a future
// refactor accidentally drops the default, OSS users self-hosting Molecule
// would silently lose image pulls — this test should fail loudly instead.
func TestRegistryPrefix_DefaultsToGHCR(t *testing.T) {
	t.Setenv("MOLECULE_IMAGE_REGISTRY", "")
	got := RegistryPrefix()
	want := "ghcr.io/molecule-ai"
	if got != want {
		t.Fatalf("RegistryPrefix() = %q, want %q (default must remain GHCR for OSS users)", got, want)
	}
}

// TestRegistryPrefix_RespectsEnv verifies the override path used in
// production tenants where MOLECULE_IMAGE_REGISTRY points at a private
// mirror (AWS ECR, self-hosted Harbor, etc.).
func TestRegistryPrefix_RespectsEnv(t *testing.T) {
	t.Setenv("MOLECULE_IMAGE_REGISTRY", "123456789012.dkr.ecr.us-east-2.amazonaws.com/molecule-ai")
	got := RegistryPrefix()
	want := "123456789012.dkr.ecr.us-east-2.amazonaws.com/molecule-ai"
	if got != want {
		t.Fatalf("RegistryPrefix() = %q, want %q (env override path is the production cutover mechanism)", got, want)
	}
}

// TestRegistryPrefix_EmptyEnvFallsBackToDefault — guard against an operator
// setting MOLECULE_IMAGE_REGISTRY="" by mistake (e.g. unset deploy variable
// becomes empty string, not literally absent). We treat "" as "use default"
// so a misconfigured env doesn't mean an empty registry prefix.
func TestRegistryPrefix_EmptyEnvFallsBackToDefault(t *testing.T) {
	t.Setenv("MOLECULE_IMAGE_REGISTRY", "")
	if RegistryPrefix() != defaultRegistryPrefix {
		t.Fatalf("empty MOLECULE_IMAGE_REGISTRY should fall back to %q, got %q", defaultRegistryPrefix, RegistryPrefix())
	}
}

// TestRuntimeImage_AllKnownRuntimes — every runtime in the canonical list
// must produce a properly-formatted image ref. If a new runtime is added to
// knownRuntimes but the format changes, this catches it.
func TestRuntimeImage_AllKnownRuntimes(t *testing.T) {
	t.Setenv("MOLECULE_IMAGE_REGISTRY", "")
	for _, r := range knownRuntimes {
		got := RuntimeImage(r)
		want := "ghcr.io/molecule-ai/workspace-template-" + r + ":latest"
		if got != want {
			t.Errorf("RuntimeImage(%q) = %q, want %q", r, got, want)
		}
	}
	// Pin the count so adding a runtime requires explicit test acknowledgement.
	if len(knownRuntimes) != 4 {
		t.Errorf("knownRuntimes length = %d, want 4 (claude-code, codex, hermes, openclaw)", len(knownRuntimes))
	}
}

// TestRuntimeImage_UnknownRuntime — defensive: callers must fall back to
// DefaultImage when a runtime is unknown, never silently use the wrong
// prefix. Returning "" enforces an explicit fallback at every call site.
func TestRuntimeImage_UnknownRuntime(t *testing.T) {
	for _, name := range []string{"", "nonexistent", "WORKSPACE-TEMPLATE-FAKE", "../../../etc/passwd"} {
		if got := RuntimeImage(name); got != "" {
			t.Errorf("RuntimeImage(%q) = %q, want empty string for unknown runtime", name, got)
		}
	}
}

// TestRuntimeImage_RegistryOverrideAppliesToAllRuntimes — the override
// flips ALL runtimes consistently. If a refactor accidentally hardcoded
// the prefix in some runtimes but not others (the failure mode that
// triggered this whole rollout), this test catches it.
func TestRuntimeImage_RegistryOverrideAppliesToAllRuntimes(t *testing.T) {
	const ecr = "999999999999.dkr.ecr.us-east-2.amazonaws.com/molecule-ai"
	t.Setenv("MOLECULE_IMAGE_REGISTRY", ecr)

	for _, r := range knownRuntimes {
		got := RuntimeImage(r)
		if !strings.HasPrefix(got, ecr+"/workspace-template-") {
			t.Errorf("RuntimeImage(%q) = %q, must start with override prefix %q", r, got, ecr)
		}
		if !strings.HasSuffix(got, ":latest") {
			t.Errorf("RuntimeImage(%q) = %q, must keep :latest tag suffix", r, got)
		}
	}
}

// TestComputeRuntimeImages_AllRuntimesPresent — the map must contain every
// known runtime. Drift between knownRuntimes and computeRuntimeImages would
// silently break the runtime → image lookup that provisioner.Start uses.
func TestComputeRuntimeImages_AllRuntimesPresent(t *testing.T) {
	t.Setenv("MOLECULE_IMAGE_REGISTRY", "")
	m := computeRuntimeImages()
	if len(m) != len(knownRuntimes) {
		t.Fatalf("computeRuntimeImages() has %d entries, want %d (one per knownRuntime)", len(m), len(knownRuntimes))
	}
	for _, r := range knownRuntimes {
		img, ok := m[r]
		if !ok {
			t.Errorf("computeRuntimeImages() missing runtime %q", r)
			continue
		}
		if img == "" {
			t.Errorf("computeRuntimeImages()[%q] is empty", r)
		}
	}
}

// TestComputeRuntimeImages_ReflectsCurrentEnv — calling computeRuntimeImages
// after env change rebuilds the map with new prefix. Tests + ops procedures
// that flip the env in-process rely on this.
func TestComputeRuntimeImages_ReflectsCurrentEnv(t *testing.T) {
	t.Setenv("MOLECULE_IMAGE_REGISTRY", "")
	defaultMap := computeRuntimeImages()
	if !strings.HasPrefix(defaultMap["claude-code"], "ghcr.io/molecule-ai/") {
		t.Fatalf("default map should be GHCR-prefixed, got %q", defaultMap["claude-code"])
	}

	const mirror = "registry.example.com/molecule-ai"
	t.Setenv("MOLECULE_IMAGE_REGISTRY", mirror)
	mirrorMap := computeRuntimeImages()
	if !strings.HasPrefix(mirrorMap["claude-code"], mirror+"/") {
		t.Fatalf("mirror-prefixed map should start with %q, got %q", mirror, mirrorMap["claude-code"])
	}
}

// TestRegistryHost_SplitsHostFromOrgPath pins the contract that callers
// (Docker auth payloads, registry V2 HTTP base URLs) need: the host portion
// must be free of the "/molecule-ai" org suffix that appears in the
// pull-prefix form. Pre-RFC #229, ghcr.io was hardcoded in two places
// (imagewatch + admin_workspace_images auth payload); this helper is the
// single source they should resolve from.
func TestRegistryHost_SplitsHostFromOrgPath(t *testing.T) {
	cases := []struct {
		name string
		env  string
		want string
	}{
		{"default GHCR", "", "ghcr.io"},
		{"AWS ECR mirror", "004947743811.dkr.ecr.us-east-2.amazonaws.com/molecule-ai", "004947743811.dkr.ecr.us-east-2.amazonaws.com"},
		{"self-hosted Gitea", "git.moleculesai.app/molecule-ai", "git.moleculesai.app"},
		// Bare host (no /org) — defensive: return as-is rather than empty.
		{"bare host no org-path", "registry.example.com", "registry.example.com"},
		// Multi-level org path — split at the first "/" only.
		{"nested org path", "registry.example.com/org/sub", "registry.example.com"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Setenv("MOLECULE_IMAGE_REGISTRY", tc.env)
			got := RegistryHost()
			if got != tc.want {
				t.Errorf("RegistryHost() with env=%q: got %q, want %q", tc.env, got, tc.want)
			}
		})
	}
}

// TestRegistryHost_NeverEmpty — guard against a future refactor accidentally
// returning "" for some edge env value. An empty serveraddress in the
// Docker engine auth payload, or an empty host in `https:///v2/...`, would
// silently break image operations.
func TestRegistryHost_NeverEmpty(t *testing.T) {
	for _, env := range []string{"", "ghcr.io/molecule-ai", "/leading-slash", "host-only", "host/with/path"} {
		t.Setenv("MOLECULE_IMAGE_REGISTRY", env)
		if got := RegistryHost(); got == "" {
			t.Errorf("RegistryHost() with env=%q returned empty (would break Docker auth + V2 HTTP)", env)
		}
	}
}

// TestKnownRuntimes_AlphabeticalOrder — pin the order so test snapshots
// (and human readers diffing the file) see deterministic output. Adding a
// new runtime out of alphabetical order will fail this test, which is the
// nudge to keep the file readable.
func TestKnownRuntimes_AlphabeticalOrder(t *testing.T) {
	for i := 1; i < len(knownRuntimes); i++ {
		if knownRuntimes[i-1] >= knownRuntimes[i] {
			t.Errorf("knownRuntimes not alphabetical: %q comes before %q", knownRuntimes[i-1], knownRuntimes[i])
		}
	}
}