package generator

import (
	"strings"
	"testing"

	"github.com/entity-maker/entity-maker/internal/database"
)

func TestSanitizePythonIdentifier(t *testing.T) {
	tests := []struct {
		name     string
		input    string
		expected string
	}{
		{"starts with digit", "12_HOUR", "_12_HOUR"},
		{"starts with letter", "HOUR_12", "HOUR_12"},
		{"all digits", "24", "_24"},
		{"underscore first", "_12_HOUR", "_12_HOUR"},
		{"empty", "", ""},
		{"single digit", "1", "_1"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := sanitizePythonIdentifier(tt.input)
			if result != tt.expected {
				t.Errorf("sanitizePythonIdentifier(%q) = %q, want %q", tt.input, result, tt.expected)
			}
		})
	}
}

func TestGenerateEnum(t *testing.T) {
	tests := []struct {
		name        string
		enumTypes   map[string]database.EnumType
		expectError bool
		checkFunc   func(t *testing.T, result string)
	}{
		{
			name: "simple enum",
			enumTypes: map[string]database.EnumType{
				"status_enum": {
					TypeName: "status_enum",
					Values:   []string{"OPEN", "CLOSED", "PENDING"},
				},
			},
			expectError: false,
			checkFunc: func(t *testing.T, result string) {
				if !strings.Contains(result, "class StatusEnum") {
					t.Error("Expected class StatusEnum")
				}
				if !strings.Contains(result, "OPEN = \"OPEN\"") {
					t.Error("Expected OPEN = \"OPEN\"")
				}
				if !strings.Contains(result, "CLOSED = \"CLOSED\"") {
					t.Error("Expected CLOSED = \"CLOSED\"")
				}
				if !strings.Contains(result, "PENDING = \"PENDING\"") {
					t.Error("Expected PENDING = \"PENDING\"")
				}
			},
		},
		{
			name: "enum with spaces and hyphens",
			enumTypes: map[string]database.EnumType{
				"time_format_enum": {
					TypeName: "time_format_enum",
					Values:   []string{"12-hour", "24-hour"},
				},
			},
			expectError: false,
			checkFunc: func(t *testing.T, result string) {
				if !strings.Contains(result, "class TimeFormatEnum") {
					t.Error("Expected class TimeFormatEnum")
				}
				if !strings.Contains(result, "_12_HOUR = \"12-hour\"") {
					t.Error("Expected _12_HOUR = \"12-hour\" (sanitized)")
				}
				if !strings.Contains(result, "_24_HOUR = \"24-hour\"") {
					t.Error("Expected _24_HOUR = \"24-hour\" (sanitized)")
				}
			},
		},
		{
			name: "enum with duplicates after normalization",
			enumTypes: map[string]database.EnumType{
				"measurement_enum": {
					TypeName: "measurement_enum",
					Values:   []string{"international", "INTERNATIONAL", "imperial", "IMPERIAL"},
				},
			},
			expectError: false,
			checkFunc: func(t *testing.T, result string) {
				if !strings.Contains(result, "class MeasurementEnum") {
					t.Error("Expected class MeasurementEnum")
				}
				// Should only have one INTERNATIONAL and one IMPERIAL
				internationalCount := strings.Count(result, "INTERNATIONAL = ")
				if internationalCount != 1 {
					t.Errorf("Expected 1 INTERNATIONAL, got %d", internationalCount)
				}
				imperialCount := strings.Count(result, "IMPERIAL = ")
				if imperialCount != 1 {
					t.Errorf("Expected 1 IMPERIAL, got %d", imperialCount)
				}
			},
		},
		{
			name: "empty enum",
			enumTypes: map[string]database.EnumType{
				"empty_enum": {
					TypeName: "empty_enum",
					Values:   []string{},
				},
			},
			expectError: false,
			checkFunc: func(t *testing.T, result string) {
				if !strings.Contains(result, "class EmptyEnum") {
					t.Error("Expected class EmptyEnum")
				}
				if !strings.Contains(result, "pass") {
					t.Error("Expected 'pass' for empty enum")
				}
			},
		},
		{
			name: "multiple enums",
			enumTypes: map[string]database.EnumType{
				"status_enum": {
					TypeName: "status_enum",
					Values:   []string{"OPEN", "CLOSED"},
				},
				"priority_enum": {
					TypeName: "priority_enum",
					Values:   []string{"HIGH", "LOW"},
				},
			},
			expectError: false,
			checkFunc: func(t *testing.T, result string) {
				if !strings.Contains(result, "class StatusEnum") {
					t.Error("Expected class StatusEnum")
				}
				if !strings.Contains(result, "class PriorityEnum") {
					t.Error("Expected class PriorityEnum")
				}
			},
		},
		{
			name: "enum with special characters",
			enumTypes: map[string]database.EnumType{
				"special_enum": {
					TypeName: "special_enum",
					Values:   []string{"IN-PROGRESS", "ON HOLD", "DONE"},
				},
			},
			expectError: false,
			checkFunc: func(t *testing.T, result string) {
				if !strings.Contains(result, "IN_PROGRESS = \"IN-PROGRESS\"") {
					t.Error("Expected IN_PROGRESS = \"IN-PROGRESS\"")
				}
				if !strings.Contains(result, "ON_HOLD = \"ON HOLD\"") {
					t.Error("Expected ON_HOLD = \"ON HOLD\"")
				}
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ctx := &Context{
				TableInfo: &database.TableInfo{
					EnumTypes: tt.enumTypes,
				},
				EntityName: "TestEntity",
				ModuleName: "test_entity",
			}

			result, err := GenerateEnum(ctx)
			if (err != nil) != tt.expectError {
				t.Errorf("GenerateEnum() error = %v, expectError %v", err, tt.expectError)
				return
			}

			if tt.checkFunc != nil {
				tt.checkFunc(t, result)
			}

			// Check common requirements
			if !strings.Contains(result, "from enum import StrEnum") {
				t.Error("Expected import of StrEnum")
			}
			if !strings.Contains(result, "from televend_core.databases.enum import EnumMixin") {
				t.Error("Expected import of EnumMixin")
			}
		})
	}
}