package claude

import (
	"strings"
	"testing"

	"github.com/QuantumNous/new-api/dto"
)

func TestFormatClaudeResponseInfo_MessageStart(t *testing.T) {
	claudeInfo := &ClaudeResponseInfo{
		Usage: &dto.Usage{},
	}
	claudeResponse := &dto.ClaudeResponse{
		Type: "message_start",
		Message: &dto.ClaudeMediaMessage{
			Id:    "msg_123",
			Model: "claude-3-5-sonnet",
			Usage: &dto.ClaudeUsage{
				InputTokens:              100,
				OutputTokens:             1,
				CacheCreationInputTokens: 50,
				CacheReadInputTokens:     30,
			},
		},
	}

	ok := FormatClaudeResponseInfo(claudeResponse, nil, claudeInfo)
	if !ok {
		t.Fatal("expected true")
	}
	if claudeInfo.Usage.PromptTokens != 100 {
		t.Errorf("PromptTokens = %d, want 100", claudeInfo.Usage.PromptTokens)
	}
	if claudeInfo.Usage.PromptTokensDetails.CachedTokens != 30 {
		t.Errorf("CachedTokens = %d, want 30", claudeInfo.Usage.PromptTokensDetails.CachedTokens)
	}
	if claudeInfo.Usage.PromptTokensDetails.CachedCreationTokens != 50 {
		t.Errorf("CachedCreationTokens = %d, want 50", claudeInfo.Usage.PromptTokensDetails.CachedCreationTokens)
	}
	if claudeInfo.ResponseId != "msg_123" {
		t.Errorf("ResponseId = %s, want msg_123", claudeInfo.ResponseId)
	}
	if claudeInfo.Model != "claude-3-5-sonnet" {
		t.Errorf("Model = %s, want claude-3-5-sonnet", claudeInfo.Model)
	}
}

func TestFormatClaudeResponseInfo_MessageDelta_FullUsage(t *testing.T) {
	// message_start 先积累 usage
	claudeInfo := &ClaudeResponseInfo{
		Usage: &dto.Usage{
			PromptTokens: 100,
			PromptTokensDetails: dto.InputTokenDetails{
				CachedTokens:         30,
				CachedCreationTokens: 50,
			},
			CompletionTokens: 1,
		},
	}

	// message_delta 带完整 usage（原生 Anthropic 场景）
	claudeResponse := &dto.ClaudeResponse{
		Type: "message_delta",
		Usage: &dto.ClaudeUsage{
			InputTokens:              100,
			OutputTokens:             200,
			CacheCreationInputTokens: 50,
			CacheReadInputTokens:     30,
		},
	}

	ok := FormatClaudeResponseInfo(claudeResponse, nil, claudeInfo)
	if !ok {
		t.Fatal("expected true")
	}
	if claudeInfo.Usage.PromptTokens != 100 {
		t.Errorf("PromptTokens = %d, want 100", claudeInfo.Usage.PromptTokens)
	}
	if claudeInfo.Usage.CompletionTokens != 200 {
		t.Errorf("CompletionTokens = %d, want 200", claudeInfo.Usage.CompletionTokens)
	}
	if claudeInfo.Usage.TotalTokens != 300 {
		t.Errorf("TotalTokens = %d, want 300", claudeInfo.Usage.TotalTokens)
	}
	if !claudeInfo.Done {
		t.Error("expected Done = true")
	}
}

func TestFormatClaudeResponseInfo_MessageDelta_OnlyOutputTokens(t *testing.T) {
	// 模拟 Bedrock: message_start 已积累 usage
	claudeInfo := &ClaudeResponseInfo{
		Usage: &dto.Usage{
			PromptTokens: 100,
			PromptTokensDetails: dto.InputTokenDetails{
				CachedTokens:         30,
				CachedCreationTokens: 50,
			},
			CompletionTokens:            1,
			ClaudeCacheCreation5mTokens: 10,
			ClaudeCacheCreation1hTokens: 20,
		},
	}

	// Bedrock 的 message_delta 只有 output_tokens，缺少 input_tokens 和 cache 字段
	claudeResponse := &dto.ClaudeResponse{
		Type: "message_delta",
		Usage: &dto.ClaudeUsage{
			OutputTokens: 200,
			// InputTokens, CacheCreationInputTokens, CacheReadInputTokens 都是 0
		},
	}

	ok := FormatClaudeResponseInfo(claudeResponse, nil, claudeInfo)
	if !ok {
		t.Fatal("expected true")
	}
	// PromptTokens 应保持 message_start 的值（因为 message_delta 的 InputTokens=0，不更新）
	if claudeInfo.Usage.PromptTokens != 100 {
		t.Errorf("PromptTokens = %d, want 100", claudeInfo.Usage.PromptTokens)
	}
	if claudeInfo.Usage.CompletionTokens != 200 {
		t.Errorf("CompletionTokens = %d, want 200", claudeInfo.Usage.CompletionTokens)
	}
	if claudeInfo.Usage.TotalTokens != 300 {
		t.Errorf("TotalTokens = %d, want 300", claudeInfo.Usage.TotalTokens)
	}
	// cache 字段应保持 message_start 的值
	if claudeInfo.Usage.PromptTokensDetails.CachedTokens != 30 {
		t.Errorf("CachedTokens = %d, want 30", claudeInfo.Usage.PromptTokensDetails.CachedTokens)
	}
	if claudeInfo.Usage.PromptTokensDetails.CachedCreationTokens != 50 {
		t.Errorf("CachedCreationTokens = %d, want 50", claudeInfo.Usage.PromptTokensDetails.CachedCreationTokens)
	}
	if claudeInfo.Usage.ClaudeCacheCreation5mTokens != 10 {
		t.Errorf("ClaudeCacheCreation5mTokens = %d, want 10", claudeInfo.Usage.ClaudeCacheCreation5mTokens)
	}
	if claudeInfo.Usage.ClaudeCacheCreation1hTokens != 20 {
		t.Errorf("ClaudeCacheCreation1hTokens = %d, want 20", claudeInfo.Usage.ClaudeCacheCreation1hTokens)
	}
	if !claudeInfo.Done {
		t.Error("expected Done = true")
	}
}

func TestFormatClaudeResponseInfo_NilClaudeInfo(t *testing.T) {
	claudeResponse := &dto.ClaudeResponse{Type: "message_start"}
	ok := FormatClaudeResponseInfo(claudeResponse, nil, nil)
	if ok {
		t.Error("expected false for nil claudeInfo")
	}
}

func TestFormatClaudeResponseInfo_ContentBlockDelta(t *testing.T) {
	text := "hello"
	claudeInfo := &ClaudeResponseInfo{
		Usage:        &dto.Usage{},
		ResponseText: strings.Builder{},
	}
	claudeResponse := &dto.ClaudeResponse{
		Type: "content_block_delta",
		Delta: &dto.ClaudeMediaMessage{
			Text: &text,
		},
	}

	ok := FormatClaudeResponseInfo(claudeResponse, nil, claudeInfo)
	if !ok {
		t.Fatal("expected true")
	}
	if claudeInfo.ResponseText.String() != "hello" {
		t.Errorf("ResponseText = %q, want %q", claudeInfo.ResponseText.String(), "hello")
	}
}

func TestBuildOpenAIStyleUsageFromClaudeUsage(t *testing.T) {
	usage := &dto.Usage{
		PromptTokens:     100,
		CompletionTokens: 20,
		PromptTokensDetails: dto.InputTokenDetails{
			CachedTokens:         30,
			CachedCreationTokens: 50,
		},
		ClaudeCacheCreation5mTokens: 10,
		ClaudeCacheCreation1hTokens: 20,
		UsageSemantic:               "anthropic",
	}

	openAIUsage := buildOpenAIStyleUsageFromClaudeUsage(usage)

	if openAIUsage.PromptTokens != 180 {
		t.Fatalf("PromptTokens = %d, want 180", openAIUsage.PromptTokens)
	}
	if openAIUsage.InputTokens != 180 {
		t.Fatalf("InputTokens = %d, want 180", openAIUsage.InputTokens)
	}
	if openAIUsage.TotalTokens != 200 {
		t.Fatalf("TotalTokens = %d, want 200", openAIUsage.TotalTokens)
	}
	if openAIUsage.UsageSemantic != "openai" {
		t.Fatalf("UsageSemantic = %s, want openai", openAIUsage.UsageSemantic)
	}
	if openAIUsage.UsageSource != "anthropic" {
		t.Fatalf("UsageSource = %s, want anthropic", openAIUsage.UsageSource)
	}
}

func TestBuildOpenAIStyleUsageFromClaudeUsagePreservesCacheCreationRemainder(t *testing.T) {
	tests := []struct {
		name                    string
		cachedCreationTokens    int
		cacheCreationTokens5m   int
		cacheCreationTokens1h   int
		expectedTotalInputToken int
	}{
		{
			name:                    "prefers aggregate when it includes remainder",
			cachedCreationTokens:    50,
			cacheCreationTokens5m:   10,
			cacheCreationTokens1h:   20,
			expectedTotalInputToken: 180,
		},
		{
			name:                    "falls back to split tokens when aggregate missing",
			cachedCreationTokens:    0,
			cacheCreationTokens5m:   10,
			cacheCreationTokens1h:   20,
			expectedTotalInputToken: 160,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			usage := &dto.Usage{
				PromptTokens:     100,
				CompletionTokens: 20,
				PromptTokensDetails: dto.InputTokenDetails{
					CachedTokens:         30,
					CachedCreationTokens: tt.cachedCreationTokens,
				},
				ClaudeCacheCreation5mTokens: tt.cacheCreationTokens5m,
				ClaudeCacheCreation1hTokens: tt.cacheCreationTokens1h,
				UsageSemantic:               "anthropic",
			}

			openAIUsage := buildOpenAIStyleUsageFromClaudeUsage(usage)

			if openAIUsage.PromptTokens != tt.expectedTotalInputToken {
				t.Fatalf("PromptTokens = %d, want %d", openAIUsage.PromptTokens, tt.expectedTotalInputToken)
			}
			if openAIUsage.InputTokens != tt.expectedTotalInputToken {
				t.Fatalf("InputTokens = %d, want %d", openAIUsage.InputTokens, tt.expectedTotalInputToken)
			}
		})
	}
}
