package modelcatalog

import (
	"testing"

	"github.com/maximhq/bifrost/core/schemas"
	configstoreTables "github.com/maximhq/bifrost/framework/configstore/tables"
)

func TestGetModelCapabilityEntryForModel_PrefersChatThenResponsesThenCompletion(t *testing.T) {
	contextLengthChat := 128000
	maxInputTokensChat := 64000
	maxOutputTokensChat := 16000
	modality := "text"

	mc := &ModelCatalog{
		pricingData: map[string]configstoreTables.TableModelPricing{
			makeKey("gpt-4o", "openai", "responses"): {
				Model:           "gpt-4o",
				Provider:        "openai",
				Mode:            "responses",
				ContextLength:   capabilityIntPtr(200000),
				MaxInputTokens:  capabilityIntPtr(100000),
				MaxOutputTokens: capabilityIntPtr(32000),
			},
			makeKey("gpt-4o", "openai", "chat"): {
				Model:           "gpt-4o",
				Provider:        "openai",
				Mode:            "chat",
				ContextLength:   &contextLengthChat,
				MaxInputTokens:  &maxInputTokensChat,
				MaxOutputTokens: &maxOutputTokensChat,
				Architecture: &schemas.Architecture{
					Modality: &modality,
				},
			},
		},
	}

	entry := mc.GetModelCapabilityEntryForModel("gpt-4o", schemas.OpenAI)
	if entry == nil {
		t.Fatal("expected capability entry")
	}
	if entry.Mode != "chat" {
		t.Fatalf("expected chat mode to win, got %q", entry.Mode)
	}
	if entry.ContextLength == nil || *entry.ContextLength != contextLengthChat {
		t.Fatalf("expected context_length=%d, got %#v", contextLengthChat, entry.ContextLength)
	}
	if entry.MaxInputTokens == nil || *entry.MaxInputTokens != maxInputTokensChat {
		t.Fatalf("expected max_input_tokens=%d, got %#v", maxInputTokensChat, entry.MaxInputTokens)
	}
	if entry.MaxOutputTokens == nil || *entry.MaxOutputTokens != maxOutputTokensChat {
		t.Fatalf("expected max_output_tokens=%d, got %#v", maxOutputTokensChat, entry.MaxOutputTokens)
	}
	if entry.Architecture == nil || entry.Architecture.Modality == nil || *entry.Architecture.Modality != modality {
		t.Fatalf("expected architecture modality=%q, got %#v", modality, entry.Architecture)
	}
}

func TestGetModelCapabilityEntryForModel_FallsBackToAnyModeDeterministically(t *testing.T) {
	mc := &ModelCatalog{
		pricingData: map[string]configstoreTables.TableModelPricing{
			makeKey("imagen", "vertex", "image_generation"): {
				Model:           "imagen",
				Provider:        "vertex",
				Mode:            "image_generation",
				ContextLength:   capabilityIntPtr(4096),
				MaxOutputTokens: capabilityIntPtr(1),
			},
		},
	}

	entry := mc.GetModelCapabilityEntryForModel("imagen", schemas.Vertex)
	if entry == nil {
		t.Fatal("expected capability entry")
	}
	if entry.Mode != "image_generation" {
		t.Fatalf("expected image_generation fallback, got %q", entry.Mode)
	}
}

func TestGetModelCapabilityEntryForModel_ResolvesAliasFamilyViaBaseModel(t *testing.T) {
	contextLengthChat := 128000

	mc := &ModelCatalog{
		pricingData: map[string]configstoreTables.TableModelPricing{
			makeKey("gpt-4o-2024-08-06", "openai", "responses"): {
				Model:           "gpt-4o-2024-08-06",
				BaseModel:       "gpt-4o",
				Provider:        "openai",
				Mode:            "responses",
				ContextLength:   capabilityIntPtr(64000),
				MaxOutputTokens: capabilityIntPtr(8000),
			},
			makeKey("gpt-4o-2024-08-06", "openai", "chat"): {
				Model:           "gpt-4o-2024-08-06",
				BaseModel:       "gpt-4o",
				Provider:        "openai",
				Mode:            "chat",
				ContextLength:   &contextLengthChat,
				MaxOutputTokens: capabilityIntPtr(16000),
			},
		},
		baseModelIndex: map[string]string{
			"gpt-4o-2024-08-06": "gpt-4o",
		},
	}

	entry := mc.GetModelCapabilityEntryForModel("gpt-4o", schemas.OpenAI)
	if entry == nil {
		t.Fatal("expected capability entry for base-model alias")
	}
	if entry.Mode != "chat" {
		t.Fatalf("expected chat mode to win for alias family, got %q", entry.Mode)
	}
	if entry.ContextLength == nil || *entry.ContextLength != contextLengthChat {
		t.Fatalf("expected alias family context_length=%d, got %#v", contextLengthChat, entry.ContextLength)
	}
}

func TestGetModelCapabilityEntryForModel_ResolvesProviderPrefixedAlias(t *testing.T) {
	mc := &ModelCatalog{
		pricingData: map[string]configstoreTables.TableModelPricing{
			makeKey("gpt-4o-2024-08-06", "openai", "chat"): {
				Model:           "gpt-4o-2024-08-06",
				BaseModel:       "gpt-4o",
				Provider:        "openai",
				Mode:            "chat",
				ContextLength:   capabilityIntPtr(128000),
				MaxOutputTokens: capabilityIntPtr(16000),
			},
		},
		baseModelIndex: map[string]string{
			"gpt-4o-2024-08-06": "gpt-4o",
		},
	}

	entry := mc.GetModelCapabilityEntryForModel("openai/gpt-4o", schemas.OpenAI)
	if entry == nil {
		t.Fatal("expected capability entry for provider-prefixed alias")
	}
	if entry.Mode != "chat" {
		t.Fatalf("expected chat mode for provider-prefixed alias, got %q", entry.Mode)
	}
}

func TestGetModelCapabilityEntryForModel_PrefersLiteralMatchOverAliasFamily(t *testing.T) {
	literalContextLength := 32000
	aliasContextLength := 128000

	mc := &ModelCatalog{
		pricingData: map[string]configstoreTables.TableModelPricing{
			makeKey("gpt-4o", "openai", "chat"): {
				Model:           "gpt-4o",
				BaseModel:       "gpt-4o",
				Provider:        "openai",
				Mode:            "chat",
				ContextLength:   &literalContextLength,
				MaxOutputTokens: capabilityIntPtr(4000),
			},
			makeKey("gpt-4o-2024-08-06", "openai", "chat"): {
				Model:           "gpt-4o-2024-08-06",
				BaseModel:       "gpt-4o",
				Provider:        "openai",
				Mode:            "chat",
				ContextLength:   &aliasContextLength,
				MaxOutputTokens: capabilityIntPtr(16000),
			},
		},
		baseModelIndex: map[string]string{
			"gpt-4o":            "gpt-4o",
			"gpt-4o-2024-08-06": "gpt-4o",
		},
	}

	entry := mc.GetModelCapabilityEntryForModel("gpt-4o", schemas.OpenAI)
	if entry == nil {
		t.Fatal("expected literal capability entry")
	}
	if entry.ContextLength == nil || *entry.ContextLength != literalContextLength {
		t.Fatalf("expected literal match to win with context_length=%d, got %#v", literalContextLength, entry.ContextLength)
	}
}

func TestCapabilityFieldsRoundTripThroughPricingConversions(t *testing.T) {
	modality := "text"
	inputCost := float64(1)
	outputCost := float64(2)
	entry := PricingEntry{
		BaseModel: "gpt-4o",
		Provider:  "openai",
		Mode:      "chat",
		PricingOptions: PricingOptions{
			InputCostPerToken:  &inputCost,
			OutputCostPerToken: &outputCost,
		},
		ContextLength:  capabilityIntPtr(128000),
		MaxInputTokens:     capabilityIntPtr(64000),
		MaxOutputTokens:    capabilityIntPtr(16000),
		Architecture: &schemas.Architecture{
			Modality: &modality,
		},
	}

	table := convertPricingDataToTableModelPricing("gpt-4o", entry)
	roundTrip := convertTableModelPricingToPricingData(&table)

	if roundTrip.ContextLength == nil || *roundTrip.ContextLength != 128000 {
		t.Fatalf("expected context_length to round-trip, got %#v", roundTrip.ContextLength)
	}
	if roundTrip.MaxInputTokens == nil || *roundTrip.MaxInputTokens != 64000 {
		t.Fatalf("expected max_input_tokens to round-trip, got %#v", roundTrip.MaxInputTokens)
	}
	if roundTrip.MaxOutputTokens == nil || *roundTrip.MaxOutputTokens != 16000 {
		t.Fatalf("expected max_output_tokens to round-trip, got %#v", roundTrip.MaxOutputTokens)
	}
	if roundTrip.Architecture == nil || roundTrip.Architecture.Modality == nil || *roundTrip.Architecture.Modality != modality {
		t.Fatalf("expected architecture to round-trip, got %#v", roundTrip.Architecture)
	}
}

func capabilityIntPtr(v int) *int { return &v }