package wire

import (
	"encoding/json"
	"testing"
	"time"

	"github.com/kami/hexis/internal/domain"
	"github.com/kami/hexis/pkg/client"
)

func sampleCapability() *domain.Capability {
	now := time.Date(2026, 7, 30, 12, 0, 0, 0, time.UTC)
	return &domain.Capability{
		ID:                   "cap_docker_restart",
		Name:                 "docker.restart_container",
		Description:          "Restart a container",
		TargetTypes:          []string{"container"},
		TargetEntityID:       "",
		Provider:             "workspace_mcp",
		Operation:            "docker.restart_container",
		Risk:                 domain.RiskMedium,
		ReadOnly:             false,
		ExpectedSideEffects:  "container restarts",
		RequiresConfirmation: true,
		Enabled:              true,
		TimeoutSeconds:       30,
		Attributes:           map[string]any{"allowlist": "docker"},
		CreatedAt:            now,
		UpdatedAt:            now,
		Version:              1,
	}
}

func marshalCapability(t *testing.T, c *domain.Capability) map[string]any {
	t.Helper()
	data, err := json.Marshal(Capability(c))
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}
	var out map[string]any
	if err := json.Unmarshal(data, &out); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	return out
}

// TestCapability_EmitsBothIDAliases pins the deliberate redundancy documented
// on client.Capability. Maven's consumer reads `id`; the spec and the rest of
// the API say `capability_id`. Hexis is already breaking that consumer with
// bearer auth, so dropping either alias here would be a second, silent break.
// If this test is ever changed, it must be as an announced removal, not a
// tidy-up.
func TestCapability_EmitsBothIDAliases(t *testing.T) {
	out := marshalCapability(t, sampleCapability())

	id, hasID := out["id"]
	capID, hasCapID := out["capability_id"]
	if !hasID {
		t.Error("`id` missing — Maven's vendored client decodes this field")
	}
	if !hasCapID {
		t.Error("`capability_id` missing — this is the ECOSYSTEM-SPEC.md §4.1 name")
	}
	if id != capID {
		t.Errorf("aliases disagree: id=%v capability_id=%v", id, capID)
	}
	if id != "cap_docker_restart" {
		t.Errorf("unexpected id %v", id)
	}
}

// TestCapability_CarriesServerDerivedGuards pins the review finding that
// listCapabilities omitted `enabled` and `requires_confirmation`, leaving a
// client unable to distinguish a callable capability from one that would be
// refused with 403. Both are always present, even when false.
func TestCapability_CarriesServerDerivedGuards(t *testing.T) {
	out := marshalCapability(t, sampleCapability())

	if got, ok := out["enabled"].(bool); !ok || !got {
		t.Errorf("enabled: expected true, got %#v", out["enabled"])
	}
	if got, ok := out["requires_confirmation"].(bool); !ok || !got {
		t.Errorf("requires_confirmation: expected true, got %#v", out["requires_confirmation"])
	}

	// Both must be emitted even at their zero value — `omitempty` here would
	// read to a client as "unknown", not "false".
	c := sampleCapability()
	c.Enabled = false
	c.RequiresConfirmation = false
	out = marshalCapability(t, c)
	if _, ok := out["enabled"]; !ok {
		t.Error("`enabled` omitted when false; it must always be present")
	}
	if _, ok := out["requires_confirmation"]; !ok {
		t.Error("`requires_confirmation` omitted when false; it must always be present")
	}
}

// TestCapability_IsASupersetOfEveryPreviousShape guards against a silent field
// removal for consumers of any of the four shapes this serializer replaced:
// the HTTP list response, the HTTP get response (raw domain.Capability), the
// MCP adapter's map, and pkg/client.
func TestCapability_IsASupersetOfEveryPreviousShape(t *testing.T) {
	out := marshalCapability(t, sampleCapability())

	required := []string{
		// union of the old listCapabilities map and the MCP adapter map
		"id", "capability_id", "name", "description", "target_types",
		"provider", "operation", "risk", "read_only", "expected_side_effects",
		// previously only on the raw domain.Capability returned by GET by ID
		"requires_confirmation", "enabled", "timeout_seconds", "attributes",
		"created_at", "updated_at", "version",
	}
	for _, k := range required {
		if _, ok := out[k]; !ok {
			t.Errorf("field %q dropped by the unified serializer", k)
		}
	}
}

// TestCapability_TargetTypesNeverNull — clients range over this array; `null`
// is a decode hazard for the non-Go consumers the Command Center will add.
func TestCapability_TargetTypesNeverNull(t *testing.T) {
	c := sampleCapability()
	c.TargetTypes = nil
	out := marshalCapability(t, c)

	tt, ok := out["target_types"].([]any)
	if !ok {
		t.Fatalf("target_types is %#v, want []", out["target_types"])
	}
	if len(tt) != 0 {
		t.Errorf("expected empty array, got %v", tt)
	}
}

// TestCapabilities_EmptySliceIsNotNull — the HTTP list endpoint must render
// `[]`, not `null`, when an entity has no capabilities.
func TestCapabilities_EmptySliceIsNotNull(t *testing.T) {
	data, err := json.Marshal(Capabilities(nil))
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}
	if string(data) != "[]" {
		t.Errorf("expected [], got %s", string(data))
	}
}

// TestCapability_RoundTripsThroughPublicClient closes the loop: what the
// server serializes is exactly what pkg/client — and therefore Maven —
// decodes. A drift between producer and consumer shape is the whole class of
// bug this unification exists to remove.
func TestCapability_RoundTripsThroughPublicClient(t *testing.T) {
	src := sampleCapability()
	data, err := json.Marshal(Capability(src))
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	var got client.Capability
	if err := json.Unmarshal(data, &got); err != nil {
		t.Fatalf("decode into client.Capability: %v", err)
	}

	if got.ID != src.ID || got.CapabilityID != src.ID {
		t.Errorf("id round-trip: ID=%q CapabilityID=%q want %q", got.ID, got.CapabilityID, src.ID)
	}
	if got.EffectiveID() != src.ID {
		t.Errorf("EffectiveID() = %q, want %q", got.EffectiveID(), src.ID)
	}
	if got.Name != src.Name || got.ReadOnly != src.ReadOnly || got.Risk != src.Risk {
		t.Errorf("field drift: %+v", got)
	}
	if !got.Enabled || !got.RequiresConfirmation {
		t.Errorf("guard fields lost in round trip: %+v", got)
	}
	if got.Version != src.Version || !got.CreatedAt.Equal(src.CreatedAt) {
		t.Errorf("metadata lost in round trip: %+v", got)
	}
}

// TestCapability_EffectiveIDToleratesEitherAlias covers a peer (an older Hexis
// or a hand-rolled client) that sends only one of the two names.
func TestCapability_EffectiveIDToleratesEitherAlias(t *testing.T) {
	cases := map[string]string{
		`{"id":"cap_x"}`:                         "cap_x",
		`{"capability_id":"cap_y"}`:              "cap_y",
		`{"id":"cap_z","capability_id":"cap_z"}`: "cap_z",
	}
	for body, want := range cases {
		var c client.Capability
		if err := json.Unmarshal([]byte(body), &c); err != nil {
			t.Fatalf("decode %s: %v", body, err)
		}
		if got := c.EffectiveID(); got != want {
			t.Errorf("%s: EffectiveID() = %q, want %q", body, got, want)
		}
	}
}

func TestCapability_NilIsZeroValue(t *testing.T) {
	if got := Capability(nil); got.EffectiveID() != "" {
		t.Errorf("nil capability produced %+v", got)
	}
}