package generator

import (
	"database/sql"
	"strings"
	"testing"

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

func TestGetRelationshipName(t *testing.T) {
	tests := []struct {
		name     string
		input    string
		expected string
	}{
		{"with _id suffix", "author_info_id", "author_info"},
		{"with user_id", "user_id", "user"},
		{"without _id", "status", "status"},
		{"just id", "id", "id"}, // "id" doesn't have "_id" suffix, so returns as-is
		{"empty", "", ""},
	}

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

func TestGetRelationshipEntityName(t *testing.T) {
	tests := []struct {
		name     string
		input    string
		expected string
	}{
		{"plural table", "users", "User"},
		{"compound plural", "user_accounts", "UserAccount"},
		{"ies ending", "companies", "Company"},
		{"already singular", "user", "User"},
	}

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

func TestGetRelationshipModuleName(t *testing.T) {
	tests := []struct {
		name     string
		input    string
		expected string
	}{
		{"plural table", "users", "user"},
		{"compound plural", "user_accounts", "user_account"},
		{"ies ending", "companies", "company"},
		{"already singular", "user", "user"},
	}

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

func TestGetFilterFieldName(t *testing.T) {
	tests := []struct {
		name       string
		columnName string
		useIN      bool
		expected   string
	}{
		{"id with IN", "id", true, "ids"},
		{"id without IN", "id", false, "id"},
		{"user_id with IN", "user_id", true, "user_ids"},
		{"user_id without IN", "user_id", false, "user_id"},
		{"machine_id with IN", "machine_id", true, "machine_ids"},
		{"status without IN", "status", false, "status"},
		{"status with IN", "status", true, "status"},
	}

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

func TestShouldGenerateFilter(t *testing.T) {
	tests := []struct {
		name     string
		col      database.Column
		expected bool
	}{
		{
			name: "boolean field",
			col: database.Column{
				Name:     "alive",
				DataType: "boolean",
			},
			expected: true,
		},
		{
			name: "id field",
			col: database.Column{
				Name:     "id",
				DataType: "integer",
			},
			expected: true,
		},
		{
			name: "foreign key field",
			col: database.Column{
				Name:     "user_id",
				DataType: "integer",
			},
			expected: true,
		},
		{
			name: "text field",
			col: database.Column{
				Name:     "name",
				DataType: "text",
			},
			expected: true,
		},
		{
			name: "varchar field",
			col: database.Column{
				Name:     "email",
				DataType: "character varying",
			},
			expected: true,
		},
		{
			name: "numeric field",
			col: database.Column{
				Name:     "amount",
				DataType: "numeric",
			},
			expected: false,
		},
		{
			name: "timestamp field",
			col: database.Column{
				Name:     "created_at",
				DataType: "timestamp with time zone",
			},
			expected: false,
		},
	}

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

func TestNeedsDecimalImport(t *testing.T) {
	tests := []struct {
		name     string
		columns  []database.Column
		expected bool
	}{
		{
			name: "has numeric column",
			columns: []database.Column{
				{Name: "amount", DataType: "numeric"},
			},
			expected: true,
		},
		{
			name: "has decimal column",
			columns: []database.Column{
				{Name: "price", DataType: "decimal"},
			},
			expected: true,
		},
		{
			name: "no numeric columns",
			columns: []database.Column{
				{Name: "id", DataType: "integer"},
				{Name: "name", DataType: "varchar"},
			},
			expected: false,
		},
		{
			name:     "empty columns",
			columns:  []database.Column{},
			expected: false,
		},
	}

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

func TestNeedsDatetimeImport(t *testing.T) {
	tests := []struct {
		name     string
		columns  []database.Column
		expected bool
	}{
		{
			name: "has timestamp column",
			columns: []database.Column{
				{Name: "created_at", DataType: "timestamp with time zone"},
			},
			expected: true,
		},
		{
			name: "has date column",
			columns: []database.Column{
				{Name: "birth_date", DataType: "date"},
			},
			expected: true,
		},
		{
			name: "no datetime columns",
			columns: []database.Column{
				{Name: "id", DataType: "integer"},
				{Name: "name", DataType: "varchar"},
			},
			expected: false,
		},
	}

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

func TestGetRequiredColumns(t *testing.T) {
	columns := []database.Column{
		{Name: "id", DataType: "integer", IsNullable: false, IsPrimaryKey: true},
		{Name: "name", DataType: "varchar", IsNullable: false, ColumnDefault: sql.NullString{Valid: false}},
		{Name: "email", DataType: "varchar", IsNullable: true},
		{Name: "created_at", DataType: "timestamp", IsNullable: false, ColumnDefault: sql.NullString{Valid: true, String: "now()"}},
		{Name: "count", DataType: "integer", IsNullable: false, IsAutoIncrement: true},
	}

	result := GetRequiredColumns(columns)

	// Should only include 'name' (not nullable, no default, not PK, not auto-increment)
	if len(result) != 1 {
		t.Errorf("Expected 1 required column, got %d", len(result))
	}

	if len(result) > 0 && result[0].Name != "name" {
		t.Errorf("Expected required column to be 'name', got %q", result[0].Name)
	}
}

func TestGetOptionalColumns(t *testing.T) {
	columns := []database.Column{
		{Name: "id", DataType: "integer", IsNullable: false, IsPrimaryKey: true},
		{Name: "name", DataType: "varchar", IsNullable: false},
		{Name: "email", DataType: "varchar", IsNullable: true},
		{Name: "created_at", DataType: "timestamp", IsNullable: false, ColumnDefault: sql.NullString{Valid: true, String: "now()"}},
	}

	result := GetOptionalColumns(columns)

	// Should include 'email' (nullable) and 'created_at' (has default)
	if len(result) != 2 {
		t.Errorf("Expected 2 optional columns, got %d", len(result))
	}
}

func TestGetForeignKeyForColumn(t *testing.T) {
	fks := []database.ForeignKey{
		{ColumnName: "user_id", ForeignTableName: "users"},
		{ColumnName: "company_id", ForeignTableName: "companies"},
	}

	tests := []struct {
		name       string
		columnName string
		expectNil  bool
		expectFK   string
	}{
		{"found user_id", "user_id", false, "users"},
		{"found company_id", "company_id", false, "companies"},
		{"not found", "status_id", true, ""},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := GetForeignKeyForColumn(tt.columnName, fks)
			if tt.expectNil {
				if result != nil {
					t.Errorf("Expected nil, got %+v", result)
				}
			} else {
				if result == nil {
					t.Errorf("Expected FK, got nil")
				} else if result.ForeignTableName != tt.expectFK {
					t.Errorf("Expected FK table %q, got %q", tt.expectFK, result.ForeignTableName)
				}
			}
		})
	}
}

func TestGenerateInit(t *testing.T) {
	ctx := &Context{
		EntityName: "User",
		ModuleName: "user",
	}

	result, err := GenerateInit(ctx)
	if err != nil {
		t.Fatalf("GenerateInit failed: %v", err)
	}

	// __init__.py should be empty
	if result != "" {
		t.Errorf("Expected empty __init__.py, got %q", result)
	}
}

func TestGenerateRepository(t *testing.T) {
	tableInfo := &database.TableInfo{
		Schema:    "public",
		TableName: "users",
		Columns:   []database.Column{},
	}

	ctx := NewContext(tableInfo, "")

	result, err := GenerateRepository(ctx)
	if err != nil {
		t.Fatalf("GenerateRepository failed: %v", err)
	}

	// Check for expected content
	expectedStrings := []string{
		"class UserRepository",
		"CRUDRepository",
		"model_cls = User",
		"from televend_core.databases.base_repository import CRUDRepository",
		"from televend_core.databases.cloud_repositories.user.filter import",
		"from televend_core.databases.cloud_repositories.user.model import User",
	}

	for _, expected := range expectedStrings {
		if !strings.Contains(result, expected) {
			t.Errorf("Expected repository to contain %q, but it doesn't.\nGenerated:\n%s",
				expected, result)
		}
	}
}

func TestGenerateManager(t *testing.T) {
	tableInfo := &database.TableInfo{
		Schema:    "public",
		TableName: "users",
		Columns:   []database.Column{},
	}

	ctx := NewContext(tableInfo, "")

	result, err := GenerateManager(ctx)
	if err != nil {
		t.Fatalf("GenerateManager failed: %v", err)
	}

	// Check for expected content
	expectedStrings := []string{
		"class UserManager",
		"CRUDManager",
		"repository_cls = UserRepository",
	}

	for _, expected := range expectedStrings {
		if !strings.Contains(result, expected) {
			t.Errorf("Expected manager to contain %q, but it doesn't.\nGenerated:\n%s",
				expected, result)
		}
	}
}

func TestNewContext(t *testing.T) {
	tableInfo := &database.TableInfo{
		Schema:    "public",
		TableName: "user_accounts",
	}

	// Test without override
	ctx := NewContext(tableInfo, "")
	if ctx.EntityName != "UserAccount" {
		t.Errorf("Expected EntityName 'UserAccount', got %q", ctx.EntityName)
	}
	if ctx.ModuleName != "user_account" {
		t.Errorf("Expected ModuleName 'user_account', got %q", ctx.ModuleName)
	}
	if ctx.TableConstant != "USER_ACCOUNT_TABLE" {
		t.Errorf("Expected TableConstant 'USER_ACCOUNT_TABLE', got %q", ctx.TableConstant)
	}

	// Test with override
	ctx = NewContext(tableInfo, "CustomUser")
	if ctx.EntityName != "CustomUser" {
		t.Errorf("Expected EntityName 'CustomUser', got %q", ctx.EntityName)
	}
}

func TestGenerateTable(t *testing.T) {
	tests := []struct {
		name      string
		tableInfo *database.TableInfo
		expected  []string
	}{
		{
			name: "simple table with basic types",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "users",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsAutoIncrement: true, IsNullable: false},
					{Name: "name", DataType: "character varying", CharMaxLength: sql.NullInt64{Valid: true, Int64: 255}, IsNullable: false},
					{Name: "email", DataType: "varchar", IsNullable: true},
				},
				ForeignKeys: []database.ForeignKey{},
				EnumTypes:   map[string]database.EnumType{},
			},
			expected: []string{
				"from sqlalchemy import",
				"Column",
				"Table",
				"Integer",
				"String",
				"USER_TABLE = Table(",
				`"users"`,
				"metadata_obj",
				`Column("id", Integer, primary_key=True, autoincrement=True)`,
				`Column("name", String(255), nullable=False)`,
				`Column("email", String)`,
			},
		},
		{
			name: "table with foreign keys",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "posts",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "user_id", DataType: "integer", IsNullable: false},
					{Name: "title", DataType: "text", IsNullable: false},
				},
				ForeignKeys: []database.ForeignKey{
					{ColumnName: "user_id", ForeignTableName: "users", ForeignColumnName: "id"},
				},
				EnumTypes: map[string]database.EnumType{},
			},
			expected: []string{
				"ForeignKey",
				`ForeignKey("users.id", deferrable=True, initially="DEFERRED")`,
			},
		},
		{
			name: "table with enum",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "orders",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "status", DataType: "USER-DEFINED", UdtName: "order_status", IsNullable: false},
				},
				ForeignKeys: []database.ForeignKey{},
				EnumTypes: map[string]database.EnumType{
					"order_status": {
						TypeName: "order_status",
						Values:   []string{"pending", "completed", "cancelled"},
					},
				},
			},
			expected: []string{
				"Enum",
				"from televend_core.databases.cloud_repositories.order.enum import",
				"OrderStatus",
				`Enum(`,
				`*OrderStatus.to_value_list()`,
				`name="order_status"`,
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ctx := NewContext(tt.tableInfo, "")
			result, err := GenerateTable(ctx)
			if err != nil {
				t.Fatalf("GenerateTable failed: %v", err)
			}

			for _, expected := range tt.expected {
				if !strings.Contains(result, expected) {
					t.Errorf("Expected table to contain %q, but it doesn't.\nGenerated:\n%s",
						expected, result)
				}
			}
		})
	}
}

func TestGenerateModel(t *testing.T) {
	tests := []struct {
		name      string
		tableInfo *database.TableInfo
		expected  []string
	}{
		{
			name: "simple model",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "users",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "name", DataType: "varchar", IsNullable: false},
					{Name: "email", DataType: "varchar", IsNullable: true},
				},
				ForeignKeys: []database.ForeignKey{},
				EnumTypes:   map[string]database.EnumType{},
			},
			expected: []string{
				"from dataclasses import dataclass",
				"from televend_core.databases.base_model import Base",
				"@dataclass",
				"class User(Base):",
				"name: str",
				"email: str | None = None",
				"id: int | None = None",
			},
		},
		{
			name: "model with foreign key",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "posts",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "user_id", DataType: "integer", IsNullable: false},
					{Name: "title", DataType: "text", IsNullable: false},
				},
				ForeignKeys: []database.ForeignKey{
					{ColumnName: "user_id", ForeignTableName: "users", ForeignColumnName: "id"},
				},
				EnumTypes: map[string]database.EnumType{},
			},
			expected: []string{
				"from televend_core.databases.cloud_repositories.user.model import User",
				"user_id: int",
				"user: User",
				"title: str",
			},
		},
		{
			name: "model with datetime and decimal",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "orders",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "amount", DataType: "numeric", IsNullable: false},
					{Name: "created_at", DataType: "timestamp with time zone", IsNullable: false, ColumnDefault: sql.NullString{Valid: true, String: "now()"}},
				},
				ForeignKeys: []database.ForeignKey{},
				EnumTypes:   map[string]database.EnumType{},
			},
			expected: []string{
				"from datetime import datetime",
				"from decimal import Decimal",
				"amount: Decimal",
				"created_at: datetime | None = None",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ctx := NewContext(tt.tableInfo, "")
			result, err := GenerateModel(ctx)
			if err != nil {
				t.Fatalf("GenerateModel failed: %v", err)
			}

			for _, expected := range tt.expected {
				if !strings.Contains(result, expected) {
					t.Errorf("Expected model to contain %q, but it doesn't.\nGenerated:\n%s",
						expected, result)
				}
			}
		})
	}
}

func TestGenerateFilter(t *testing.T) {
	tests := []struct {
		name      string
		tableInfo *database.TableInfo
		expected  []string
		notExpect []string
	}{
		{
			name: "filter with boolean and id fields",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "users",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true},
					{Name: "name", DataType: "varchar"},
					{Name: "alive", DataType: "boolean"},
					{Name: "user_id", DataType: "integer"},
				},
				ForeignKeys: []database.ForeignKey{},
			},
			expected: []string{
				"from televend_core.databases.base_filter import BaseFilter",
				"from televend_core.databases.common.filters.filters import EQ, IN, filterfield",
				"class UserFilter(BaseFilter):",
				"model_cls = User",
				"id: int | None = filterfield(operator=EQ)",
				"ids: list[int] | None = filterfield(field=\"id\", operator=IN)",
				"name: str | None = filterfield(operator=EQ)",
				"alive: bool | None = filterfield(operator=EQ, default=True)",
				"user_id: int | None = filterfield(operator=EQ)",
				"user_ids: list[int] | None = filterfield(field=\"user_id\", operator=IN)",
			},
			notExpect: []string{
				"default=None",
			},
		},
		{
			name: "filter with no filterable fields",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "logs",
				Columns: []database.Column{
					{Name: "timestamp", DataType: "timestamp with time zone"},
					{Name: "amount", DataType: "numeric"},
				},
				ForeignKeys: []database.ForeignKey{},
			},
			expected: []string{
				"class LogFilter(BaseFilter):",
				"pass",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ctx := NewContext(tt.tableInfo, "")
			result, err := GenerateFilter(ctx)
			if err != nil {
				t.Fatalf("GenerateFilter failed: %v", err)
			}

			for _, expected := range tt.expected {
				if !strings.Contains(result, expected) {
					t.Errorf("Expected filter to contain %q, but it doesn't.\nGenerated:\n%s",
						expected, result)
				}
			}

			for _, notExpected := range tt.notExpect {
				if strings.Contains(result, notExpected) {
					t.Errorf("Did not expect filter to contain %q, but it does.\nGenerated:\n%s",
						notExpected, result)
				}
			}
		})
	}
}

func TestGenerateLoadOptions(t *testing.T) {
	tests := []struct {
		name      string
		tableInfo *database.TableInfo
		expected  []string
	}{
		{
			name: "load options with relationships",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "posts",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true},
					{Name: "user_id", DataType: "integer"},
					{Name: "category_id", DataType: "integer"},
				},
				ForeignKeys: []database.ForeignKey{
					{ColumnName: "user_id", ForeignTableName: "users", ForeignColumnName: "id"},
					{ColumnName: "category_id", ForeignTableName: "categories", ForeignColumnName: "id"},
				},
			},
			expected: []string{
				"from televend_core.databases.base_load_options import LoadOptions",
				"from televend_core.databases.common.load_options import joinload",
				"class PostLoadOptions(LoadOptions):",
				"model_cls = Post",
				`load_user: bool = joinload(relations=["user"])`,
				`load_category: bool = joinload(relations=["category"])`,
			},
		},
		{
			name: "load options with no relationships",
			tableInfo: &database.TableInfo{
				Schema:      "public",
				TableName:   "settings",
				Columns:     []database.Column{{Name: "id", DataType: "integer", IsPrimaryKey: true}},
				ForeignKeys: []database.ForeignKey{},
			},
			expected: []string{
				"class SettingLoadOptions(LoadOptions):",
				"pass",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ctx := NewContext(tt.tableInfo, "")
			result, err := GenerateLoadOptions(ctx)
			if err != nil {
				t.Fatalf("GenerateLoadOptions failed: %v", err)
			}

			for _, expected := range tt.expected {
				if !strings.Contains(result, expected) {
					t.Errorf("Expected load_options to contain %q, but it doesn't.\nGenerated:\n%s",
						expected, result)
				}
			}
		})
	}
}

func TestGenerateFactory(t *testing.T) {
	tests := []struct {
		name      string
		tableInfo *database.TableInfo
		expected  []string
	}{
		{
			name: "factory with basic fields",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "users",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "name", DataType: "varchar", CharMaxLength: sql.NullInt64{Valid: true, Int64: 100}},
					{Name: "alive", DataType: "boolean"},
				},
				ForeignKeys: []database.ForeignKey{},
				EnumTypes:   map[string]database.EnumType{},
			},
			expected: []string{
				"from __future__ import annotations",
				"from typing import Type",
				"import factory",
				"class UserFactory(CloudBaseFactory):",
				"alive = True",
				"id = None",
				`name = factory.Faker("pystr", max_chars=100)`,
				"class Meta:",
				"model = User",
				"def create_minimal",
			},
		},
		{
			name: "factory with foreign keys",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "posts",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "user_id", DataType: "integer", IsNullable: false},
					{Name: "title", DataType: "text"},
				},
				ForeignKeys: []database.ForeignKey{
					{ColumnName: "user_id", ForeignTableName: "users", ForeignColumnName: "id"},
				},
				EnumTypes: map[string]database.EnumType{},
			},
			expected: []string{
				"from televend_core.databases.cloud_repositories.user.factory import",
				"UserFactory",
				`user = CustomSelfAttribute("..user", UserFactory)`,
				"user_id = factory.LazyAttribute(lambda a: a.user.id if a.user else None)",
				`"user": kwargs.pop("user", None) or UserFactory.create_minimal()`,
			},
		},
		{
			name: "factory with decimal field",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "orders",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true, IsNullable: false},
					{Name: "amount", DataType: "numeric", NumericPrecision: sql.NullInt64{Valid: true, Int64: 10}, NumericScale: sql.NullInt64{Valid: true, Int64: 2}},
				},
				ForeignKeys: []database.ForeignKey{},
				EnumTypes:   map[string]database.EnumType{},
			},
			expected: []string{
				`amount = factory.Faker("pydecimal", left_digits=8, right_digits=2, positive=True)`,
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ctx := NewContext(tt.tableInfo, "")
			result, err := GenerateFactory(ctx)
			if err != nil {
				t.Fatalf("GenerateFactory failed: %v", err)
			}

			for _, expected := range tt.expected {
				if !strings.Contains(result, expected) {
					t.Errorf("Expected factory to contain %q, but it doesn't.\nGenerated:\n%s",
						expected, result)
				}
			}
		})
	}
}

func TestGenerateMapper(t *testing.T) {
	tests := []struct {
		name      string
		tableInfo *database.TableInfo
		expected  []string
	}{
		{
			name: "mapper with single foreign key",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "posts",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true},
					{Name: "user_id", DataType: "integer"},
				},
				ForeignKeys: []database.ForeignKey{
					{ColumnName: "user_id", ForeignTableName: "users", ForeignColumnName: "id"},
				},
			},
			expected: []string{
				"mapper_registry.map_imperatively(",
				"class_=Post,",
				"local_table=POST_TABLE,",
				"properties={",
				`"user": relationship(`,
				"User, lazy=relationship_loading_strategy.value",
			},
		},
		{
			name: "mapper with multiple foreign keys to same table",
			tableInfo: &database.TableInfo{
				Schema:    "public",
				TableName: "messages",
				Columns: []database.Column{
					{Name: "id", DataType: "integer", IsPrimaryKey: true},
					{Name: "sender_id", DataType: "integer"},
					{Name: "receiver_id", DataType: "integer"},
				},
				ForeignKeys: []database.ForeignKey{
					{ColumnName: "sender_id", ForeignTableName: "users", ForeignColumnName: "id"},
					{ColumnName: "receiver_id", ForeignTableName: "users", ForeignColumnName: "id"},
				},
			},
			expected: []string{
				`"sender": relationship(`,
				"User, lazy=relationship_loading_strategy.value",
				`"receiver": relationship(`,
				"foreign_keys=MESSAGE_TABLE.columns.receiver_id,",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			ctx := NewContext(tt.tableInfo, "")
			result, err := GenerateMapper(ctx)
			if err != nil {
				t.Fatalf("GenerateMapper failed: %v", err)
			}

			for _, expected := range tt.expected {
				if !strings.Contains(result, expected) {
					t.Errorf("Expected mapper to contain %q, but it doesn't.\nGenerated:\n%s",
						expected, result)
				}
			}
		})
	}
}

func TestGetPythonTypeForColumn(t *testing.T) {
	ctx := &Context{
		TableInfo: &database.TableInfo{
			EnumTypes: map[string]database.EnumType{
				"status_enum": {
					TypeName: "status_enum",
					Values:   []string{"active", "inactive"},
				},
			},
		},
	}

	tests := []struct {
		name     string
		col      database.Column
		expected string
	}{
		{
			name:     "integer type",
			col:      database.Column{DataType: "integer"},
			expected: "int",
		},
		{
			name:     "varchar type",
			col:      database.Column{DataType: "varchar"},
			expected: "str",
		},
		{
			name:     "enum type",
			col:      database.Column{DataType: "USER-DEFINED", UdtName: "status_enum"},
			expected: "StatusEnum",
		},
		{
			name:     "unknown enum type",
			col:      database.Column{DataType: "USER-DEFINED", UdtName: "unknown_enum"},
			expected: "str",
		},
	}

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