package vertex

import (
	"errors"
	"testing"

	"nudgebee/llm/llms/googleai/internal/palmclient"

	"nudgebee/llm/llms/googleai"
)

func TestCreateEmbedding(t *testing.T) {
	tests := []struct {
		name           string
		texts          []string
		mockEmbeddings [][]float32
		mockErr        error
		wantErr        bool
		errContains    string
	}{
		{
			name:  "successful single embedding",
			texts: []string{"Hello, world!"},
			mockEmbeddings: [][]float32{
				{0.1, 0.2, 0.3, 0.4},
			},
			wantErr: false,
		},
		{
			name:  "successful multiple embeddings",
			texts: []string{"First text", "Second text", "Third text"},
			mockEmbeddings: [][]float32{
				{0.1, 0.2, 0.3},
				{0.4, 0.5, 0.6},
				{0.7, 0.8, 0.9},
			},
			wantErr: false,
		},
		{
			name:           "empty response error",
			texts:          []string{"Test text"},
			mockEmbeddings: [][]float32{},
			wantErr:        true,
			errContains:    "empty response",
		},
		{
			name:  "mismatched count error",
			texts: []string{"First", "Second"},
			mockEmbeddings: [][]float32{
				{0.1, 0.2, 0.3},
			},
			wantErr:     true,
			errContains: "returned 1 embeddings for 2 texts",
		},
		{
			name:        "palm client error",
			texts:       []string{"Test"},
			mockErr:     errors.New("API error"),
			wantErr:     true,
			errContains: "API error",
		},
		{
			name:           "empty texts",
			texts:          []string{},
			mockEmbeddings: [][]float32{},
			wantErr:        true,
			errContains:    "empty response",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Create a Vertex instance with mocked palm client
			v := &Vertex{
				opts: googleai.DefaultOptions(),
				// We can't easily mock the palmClient field since it's private
				// and the type is from an internal package
			}

			// For actual testing, we'd need to either:
			// 1. Make palmClient an interface
			// 2. Use dependency injection
			// 3. Use a testing package that can mock private fields

			// Since we can't directly test CreateEmbedding without modifying
			// the production code, we'll test what we can
			if v.opts.DefaultEmbeddingModel != "embedding-001" {
				t.Errorf("expected default embedding model 'embedding-001', got %q", v.opts.DefaultEmbeddingModel)
			}
		})
	}
}

func TestCreateEmbeddingValidation(t *testing.T) {
	// Test input validation scenarios
	tests := []struct {
		name  string
		texts []string
	}{
		{
			name:  "nil texts slice",
			texts: nil,
		},
		{
			name:  "empty texts slice",
			texts: []string{},
		},
		{
			name:  "single empty string",
			texts: []string{""},
		},
		{
			name:  "mixed empty and non-empty strings",
			texts: []string{"valid", "", "another valid"},
		},
		{
			name:  "very long text",
			texts: []string{string(make([]byte, 10000))},
		},
		{
			name:  "special characters",
			texts: []string{"Text with 特殊字符 and émojis 🚀"},
		},
		{
			name:  "newlines and tabs",
			texts: []string{"Text with\nnewlines\tand\ttabs"},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// We can't test the actual behavior without a real or mocked client,
			// but we document the test cases for when the code is refactored
			// to be more testable
			_ = tt.texts
		})
	}
}

func TestEmbeddingDimensions(t *testing.T) {
	// Test different embedding dimensions
	testCases := []struct {
		name       string
		embeddings [][]float32
		valid      bool
	}{
		{
			name: "standard 768 dimensions",
			embeddings: [][]float32{
				make([]float32, 768),
			},
			valid: true,
		},
		{
			name: "small dimensions",
			embeddings: [][]float32{
				{0.1, 0.2, 0.3},
			},
			valid: true,
		},
		{
			name: "inconsistent dimensions",
			embeddings: [][]float32{
				{0.1, 0.2, 0.3},
				{0.4, 0.5}, // Different dimension
			},
			valid: false, // This would be an error case
		},
		{
			name: "zero dimensions",
			embeddings: [][]float32{
				{},
			},
			valid: false, // Empty embeddings should be an error
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			// Document test case for future implementation
			_ = tc
		})
	}
}

// TestEmbeddingRequestStructure verifies the structure of embedding requests
func TestEmbeddingRequestStructure(t *testing.T) {
	// This test documents the expected structure of palmclient.EmbeddingRequest
	req := &palmclient.EmbeddingRequest{
		Input: []string{"test text"},
	}

	if len(req.Input) != 1 {
		t.Errorf("expected 1 input, got %d", len(req.Input))
	}
	if req.Input[0] != "test text" {
		t.Errorf("expected input 'test text', got %q", req.Input[0])
	}
}

// TestVertexEmbeddingIntegration would test the full integration
// but requires actual API credentials or more sophisticated mocking
func TestVertexEmbeddingIntegration(t *testing.T) {
	t.Skip("Integration test requires API credentials")

	// This test is skipped but documents how integration testing would work:
	// 1. Create a Vertex client with valid credentials
	// 2. Call CreateEmbedding with test texts
	// 3. Verify embeddings are returned
	// 4. Check embedding dimensions and values
	// 5. Test error cases (invalid credentials, network errors, etc.)
}
