package cassandra

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestCreateSAIIndex(t *testing.T) {
	tests := []struct {
		name        string
		keyspace    string
		table       string
		column      string
		indexName   string
		options     *SAIIndexOptions
		description string
		wantErr     bool
		validate    func(*testing.T, error)
	}{
		{
			name:        "create basic SAI index",
			keyspace:    "test_keyspace",
			table:       "test_table",
			column:      "name",
			indexName:   "test_name_idx",
			options:     nil,
			description: "should create a basic SAI index",
			wantErr:     false,
		},
		{
			name:        "create SAI index with auto-generated name",
			keyspace:    "test_keyspace",
			table:       "test_table",
			column:      "email",
			indexName:   "",
			options:     nil,
			description: "should auto-generate index name",
			wantErr:     false,
		},
		{
			name:        "create SAI index with case insensitive option",
			keyspace:    "test_keyspace",
			table:       "test_table",
			column:      "title",
			indexName:   "test_title_idx",
			options:     &SAIIndexOptions{CaseSensitive: boolPtr(false)},
			description: "should create index with case insensitive option",
			wantErr:     false,
		},
		{
			name:        "create SAI index with normalize option",
			keyspace:    "test_keyspace",
			table:       "test_table",
			column:      "content",
			indexName:   "test_content_idx",
			options:     &SAIIndexOptions{Normalize: boolPtr(true)},
			description: "should create index with normalize option",
			wantErr:     false,
		},
		{
			name:        "create SAI index with analyzer",
			keyspace:    "test_keyspace",
			table:       "test_table",
			column:      "description",
			indexName:   "test_desc_idx",
			options:     &SAIIndexOptions{Analyzer: "StandardAnalyzer"},
			description: "should create index with analyzer",
			wantErr:     false,
		},
		{
			name:        "create SAI index with all options",
			keyspace:    "test_keyspace",
			table:       "test_table",
			column:      "text",
			indexName:   "test_text_idx",
			options:     &SAIIndexOptions{CaseSensitive: boolPtr(false), Normalize: boolPtr(true), Analyzer: "StandardAnalyzer"},
			description: "should create index with all options",
			wantErr:     false,
		},
		{
			name:        "missing keyspace",
			keyspace:    "",
			table:       "test_table",
			column:      "name",
			indexName:   "test_idx",
			options:     nil,
			description: "should return error when keyspace is empty and no default",
			wantErr:     true,
			validate: func(t *testing.T, err error) {
				assert.Error(t, err)
				var e *Error
				if assert.ErrorAs(t, err, &e) {
					assert.Equal(t, ErrCodeInvalidInput, e.Code)
				}
			},
		},
		{
			name:        "missing table",
			keyspace:    "test_keyspace",
			table:       "",
			column:      "name",
			indexName:   "test_idx",
			options:     nil,
			description: "should return error when table is empty",
			wantErr:     true,
			validate: func(t *testing.T, err error) {
				assert.Error(t, err)
				var e *Error
				if assert.ErrorAs(t, err, &e) {
					assert.Equal(t, ErrCodeInvalidInput, e.Code)
				}
			},
		},
		{
			name:        "missing column",
			keyspace:    "test_keyspace",
			table:       "test_table",
			column:      "",
			indexName:   "test_idx",
			options:     nil,
			description: "should return error when column is empty",
			wantErr:     true,
			validate: func(t *testing.T, err error) {
				assert.Error(t, err)
				var e *Error
				if assert.ErrorAs(t, err, &e) {
					assert.Equal(t, ErrCodeInvalidInput, e.Code)
				}
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// 注意：這需要一個有效的 DB 實例和 SAI 支援
			// 在實際測試中，需要使用 testcontainers 或 mock
			_ = tt
		})
	}
}

func TestDropSAIIndex(t *testing.T) {
	tests := []struct {
		name        string
		keyspace    string
		indexName   string
		description string
		wantErr     bool
		validate    func(*testing.T, error)
	}{
		{
			name:        "drop existing index",
			keyspace:    "test_keyspace",
			indexName:   "test_name_idx",
			description: "should drop existing index",
			wantErr:     false,
		},
		{
			name:        "drop non-existent index",
			keyspace:    "test_keyspace",
			indexName:   "non_existent_idx",
			description: "should not error when dropping non-existent index (IF EXISTS)",
			wantErr:     false,
		},
		{
			name:        "missing keyspace",
			keyspace:    "",
			indexName:   "test_idx",
			description: "should return error when keyspace is empty and no default",
			wantErr:     true,
			validate: func(t *testing.T, err error) {
				assert.Error(t, err)
				var e *Error
				if assert.ErrorAs(t, err, &e) {
					assert.Equal(t, ErrCodeInvalidInput, e.Code)
				}
			},
		},
		{
			name:        "missing index name",
			keyspace:    "test_keyspace",
			indexName:   "",
			description: "should return error when index name is empty",
			wantErr:     true,
			validate: func(t *testing.T, err error) {
				assert.Error(t, err)
				var e *Error
				if assert.ErrorAs(t, err, &e) {
					assert.Equal(t, ErrCodeInvalidInput, e.Code)
				}
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// 注意：這需要一個有效的 DB 實例和 SAI 支援
			// 在實際測試中，需要使用 testcontainers 或 mock
			_ = tt
		})
	}
}

func TestListSAIIndexes(t *testing.T) {
	tests := []struct {
		name        string
		keyspace    string
		table       string
		description string
		wantErr     bool
		validate    func(*testing.T, []SAIIndexInfo, error)
	}{
		{
			name:        "list all indexes in keyspace",
			keyspace:    "test_keyspace",
			table:       "",
			description: "should list all SAI indexes in keyspace",
			wantErr:     false,
			validate: func(t *testing.T, indexes []SAIIndexInfo, err error) {
				require.NoError(t, err)
				assert.NotNil(t, indexes)
			},
		},
		{
			name:        "list indexes for specific table",
			keyspace:    "test_keyspace",
			table:       "test_table",
			description: "should list SAI indexes for specific table",
			wantErr:     false,
			validate: func(t *testing.T, indexes []SAIIndexInfo, err error) {
				require.NoError(t, err)
				assert.NotNil(t, indexes)
				for _, idx := range indexes {
					assert.Equal(t, "test_table", idx.TableName)
				}
			},
		},
		{
			name:        "missing keyspace",
			keyspace:    "",
			table:       "",
			description: "should return error when keyspace is empty and no default",
			wantErr:     true,
			validate: func(t *testing.T, indexes []SAIIndexInfo, err error) {
				assert.Error(t, err)
				assert.Nil(t, indexes)
				var e *Error
				if assert.ErrorAs(t, err, &e) {
					assert.Equal(t, ErrCodeInvalidInput, e.Code)
				}
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// 注意：這需要一個有效的 DB 實例和 SAI 支援
			// 在實際測試中，需要使用 testcontainers 或 mock
			_ = tt
		})
	}
}

func TestGetSAIIndex(t *testing.T) {
	tests := []struct {
		name        string
		keyspace    string
		indexName   string
		description string
		wantErr     bool
		validate    func(*testing.T, *SAIIndexInfo, error)
	}{
		{
			name:        "get existing index",
			keyspace:    "test_keyspace",
			indexName:   "test_name_idx",
			description: "should get existing SAI index",
			wantErr:     false,
			validate: func(t *testing.T, index *SAIIndexInfo, err error) {
				require.NoError(t, err)
				assert.NotNil(t, index)
				assert.Equal(t, "test_name_idx", index.IndexName)
			},
		},
		{
			name:        "get non-existent index",
			keyspace:    "test_keyspace",
			indexName:   "non_existent_idx",
			description: "should return ErrNotFound",
			wantErr:     true,
			validate: func(t *testing.T, index *SAIIndexInfo, err error) {
				assert.Error(t, err)
				assert.Nil(t, index)
				assert.True(t, IsNotFound(err))
			},
		},
		{
			name:        "missing keyspace",
			keyspace:    "",
			indexName:   "test_idx",
			description: "should return error when keyspace is empty and no default",
			wantErr:     true,
			validate: func(t *testing.T, index *SAIIndexInfo, err error) {
				assert.Error(t, err)
				assert.Nil(t, index)
			},
		},
		{
			name:        "missing index name",
			keyspace:    "test_keyspace",
			indexName:   "",
			description: "should return error when index name is empty",
			wantErr:     true,
			validate: func(t *testing.T, index *SAIIndexInfo, err error) {
				assert.Error(t, err)
				assert.Nil(t, index)
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// 注意：這需要一個有效的 DB 實例和 SAI 支援
			// 在實際測試中，需要使用 testcontainers 或 mock
			_ = tt
		})
	}
}

func TestSAIIndexOptions(t *testing.T) {
	t.Run("default options", func(t *testing.T) {
		opts := &SAIIndexOptions{}
		assert.Nil(t, opts.CaseSensitive)
		assert.Nil(t, opts.Normalize)
		assert.Empty(t, opts.Analyzer)
	})

	t.Run("with case sensitive", func(t *testing.T) {
		caseSensitive := false
		opts := &SAIIndexOptions{CaseSensitive: &caseSensitive}
		assert.NotNil(t, opts.CaseSensitive)
		assert.False(t, *opts.CaseSensitive)
	})

	t.Run("with normalize", func(t *testing.T) {
		normalize := true
		opts := &SAIIndexOptions{Normalize: &normalize}
		assert.NotNil(t, opts.Normalize)
		assert.True(t, *opts.Normalize)
	})

	t.Run("with analyzer", func(t *testing.T) {
		opts := &SAIIndexOptions{Analyzer: "StandardAnalyzer"}
		assert.Equal(t, "StandardAnalyzer", opts.Analyzer)
	})
}

func TestSAIIndexInfo(t *testing.T) {
	t.Run("index info structure", func(t *testing.T) {
		info := SAIIndexInfo{
			KeyspaceName: "test_keyspace",
			TableName:    "test_table",
			IndexName:    "test_idx",
			ColumnName:   "name",
			IndexType:    "sai",
			Options:      map[string]string{"target": "name"},
		}

		assert.Equal(t, "test_keyspace", info.KeyspaceName)
		assert.Equal(t, "test_table", info.TableName)
		assert.Equal(t, "test_idx", info.IndexName)
		assert.Equal(t, "name", info.ColumnName)
		assert.Equal(t, "sai", info.IndexType)
		assert.NotNil(t, info.Options)
	})
}

// Helper function
func boolPtr(b bool) *bool {
	return &b
}