package runner

import (
	"testing"

	"github.com/easyai/easyai-ai-gateway/apps/api/internal/store"
)

func TestDistributedAdmissionModelTypeBoundary(t *testing.T) {
	for _, modelType := range []string{
		"image_generate", "image_edit", "image_analysis", "image_vectorize",
		"video_generate", "video_enhance", "image_to_video", "text_to_video",
		"video_edit", "video_reference", "video_first_last_frame", "video_understanding", "omni_video", "omni",
		"audio_generate", "audio_understanding", "text_to_speech", "voice_clone",
	} {
		if !distributedAdmissionModelType(modelType) {
			t.Errorf("%s should use distributed admission", modelType)
		}
	}
	for _, modelType := range []string{"text_generate", "embedding", "rerank", "", "unknown"} {
		if distributedAdmissionModelType(modelType) {
			t.Errorf("%s should preserve immediate execution/rate-limit behavior", modelType)
		}
	}
}

func TestAcceptanceAdmissionScopesUseWorkerCapacityInsteadOfSupplierConcurrency(t *testing.T) {
	input := []store.AdmissionScope{{
		ScopeType:       "platform_model",
		ScopeKey:        "model-1",
		ConcurrentLimit: 10,
		QueueLimit:      0,
		MaxWaitSeconds:  0,
	}, {
		ScopeType:       "worker_capacity",
		ScopeKey:        "global",
		ConcurrentLimit: 48,
	}}

	got := acceptanceAdmissionScopes(store.GatewayTask{RunMode: "acceptance"}, input)

	if got[0].ConcurrentLimit != 0 {
		t.Fatalf("protocol-emulated acceptance must defer to worker capacity, got %+v", got[0])
	}
	if got[0].QueueLimit != acceptanceQueueLimit || got[0].MaxWaitSeconds != acceptanceQueueMaxWait {
		t.Fatalf("acceptance must enable a bounded queue, got %+v", got[0])
	}
	if got[1].ConcurrentLimit != 48 {
		t.Fatalf("acceptance worker capacity changed, got %+v", got[1])
	}
	if input[0].QueueLimit != 0 || input[0].MaxWaitSeconds != 0 {
		t.Fatalf("acceptance queue overlay must not mutate the production scopes, got %+v", input[0])
	}
}

func TestAcceptanceCanaryPreservesProductionConcurrency(t *testing.T) {
	input := []store.AdmissionScope{{
		ScopeType:       "platform_model",
		ScopeKey:        "model-1",
		ConcurrentLimit: 10,
	}}

	got := acceptanceAdmissionScopes(store.GatewayTask{RunMode: "acceptance_canary"}, input)

	if got[0].ConcurrentLimit != 10 {
		t.Fatalf("real acceptance canary must preserve production concurrency, got %+v", got[0])
	}
}

func TestAcceptanceInfrastructureReservationsOnlyRemoveSupplierConcurrency(t *testing.T) {
	input := []store.RateLimitReservation{
		{ScopeType: "platform_model", Metric: "concurrent", Limit: 10},
		{ScopeType: "platform_model", Metric: "rpm", Limit: 600},
		{ScopeType: "user_group", Metric: "concurrent", Limit: 20},
	}

	got := acceptanceInfrastructureReservations(store.GatewayTask{RunMode: "acceptance"}, input)
	if len(got) != 2 || got[0].Metric != "rpm" || got[1].ScopeType != "user_group" {
		t.Fatalf("unexpected acceptance reservations: %+v", got)
	}
	canary := acceptanceInfrastructureReservations(store.GatewayTask{RunMode: "acceptance_canary"}, input)
	if len(canary) != len(input) {
		t.Fatalf("real canary reservations changed: %+v", canary)
	}
}

func TestAcceptanceAdmissionScopesLeaveProductionPolicyUnchanged(t *testing.T) {
	input := []store.AdmissionScope{{
		ScopeType:       "platform_model",
		ScopeKey:        "model-1",
		ConcurrentLimit: 10,
		QueueLimit:      3,
		MaxWaitSeconds:  7,
	}}

	got := acceptanceAdmissionScopes(store.GatewayTask{RunMode: "production"}, input)

	if got[0].QueueLimit != 3 || got[0].MaxWaitSeconds != 7 || got[0].ConcurrentLimit != 10 {
		t.Fatalf("production admission policy changed: %+v", got[0])
	}
}

func TestAsyncAdmissionBatchCoversCertifiedGlobalCapacity(t *testing.T) {
	for _, testCase := range []struct {
		globalHardLimit int
		want            int
	}{
		{globalHardLimit: 48, want: 48},
		{globalHardLimit: 64, want: 64},
		{globalHardLimit: 128, want: 64},
		{globalHardLimit: 0, want: 64},
	} {
		if got := asyncAdmissionBatchLimit(testCase.globalHardLimit); got != testCase.want {
			t.Fatalf("async admission batch limit for %d = %d, want %d", testCase.globalHardLimit, got, testCase.want)
		}
	}
}

func TestPinCandidatesToTaskAdmissionPreservesAdmittedCandidate(t *testing.T) {
	input := []store.RuntimeModelCandidate{
		{PlatformID: "platform-a", PlatformModelID: "model-a"},
		{PlatformID: "platform-b", PlatformModelID: "model-b"},
		{PlatformID: "platform-c", PlatformModelID: "model-c"},
	}
	admission := &store.TaskAdmission{
		Status:          "admitted",
		PlatformID:      "platform-b",
		PlatformModelID: "model-b",
	}

	got, pinned := pinCandidatesToTaskAdmission(input, admission)

	if !pinned {
		t.Fatal("expected admitted candidate to be pinned")
	}
	if got[0].PlatformModelID != "model-b" || got[1].PlatformModelID != "model-a" || got[2].PlatformModelID != "model-c" {
		t.Fatalf("unexpected candidate order: %+v", got)
	}
	if input[0].PlatformModelID != "model-a" {
		t.Fatalf("candidate pinning mutated the caller slice: %+v", input)
	}
}

func TestPinCandidatesToTaskAdmissionPreservesWaitingCandidate(t *testing.T) {
	input := []store.RuntimeModelCandidate{
		{PlatformID: "platform-a", PlatformModelID: "model-a"},
		{PlatformID: "platform-b", PlatformModelID: "model-b"},
	}
	admission := &store.TaskAdmission{
		Status:          "waiting",
		PlatformID:      "platform-b",
		PlatformModelID: "model-b",
	}

	got, pinned := pinCandidatesToTaskAdmission(input, admission)

	if !pinned || got[0].PlatformModelID != "model-b" {
		t.Fatalf("waiting candidate was not pinned: pinned=%v candidates=%+v", pinned, got)
	}
}

func TestPinCandidatesToTaskAdmissionIgnoresMissingCandidate(t *testing.T) {
	input := []store.RuntimeModelCandidate{
		{PlatformID: "platform-a", PlatformModelID: "model-a"},
		{PlatformID: "platform-b", PlatformModelID: "model-b"},
	}
	admission := &store.TaskAdmission{
		Status:          "admitted",
		PlatformID:      "platform-c",
		PlatformModelID: "model-c",
	}

	got, pinned := pinCandidatesToTaskAdmission(input, admission)

	if pinned {
		t.Fatalf("unexpected candidate pin for missing binding: %+v", got)
	}
	if got[0].PlatformModelID != "model-a" {
		t.Fatalf("candidate order changed for missing binding: %+v", got)
	}
}