package dctx

import (
	"path/filepath"
	"testing"

	"git.warky.dev/wdevs/relspecgo/pkg/models"
	"git.warky.dev/wdevs/relspecgo/pkg/readers"
)

func TestReader_ReadDatabase(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	db, err := reader.ReadDatabase()
	if err != nil {
		t.Fatalf("ReadDatabase() error = %v", err)
	}

	if db == nil {
		t.Fatal("ReadDatabase() returned nil database")
	}

	if db.Name == "" {
		t.Error("Expected non-empty database name")
	}

	if len(db.Schemas) == 0 {
		t.Fatal("Expected at least one schema")
	}

	schema := db.Schemas[0]
	if schema.Name == "" {
		t.Error("Expected non-empty schema name")
	}

	if len(schema.Tables) == 0 {
		t.Fatal("Expected at least one table")
	}

	// Verify at least one table has columns
	hasColumns := false
	for _, table := range schema.Tables {
		if len(table.Columns) > 0 {
			hasColumns = true
			break
		}
	}
	if !hasColumns {
		t.Error("Expected at least one table with columns")
	}

	// Verify at least one table has a primary key
	hasPK := false
	for _, table := range schema.Tables {
		pk := table.GetPrimaryKey()
		if pk != nil {
			hasPK = true
			break
		}
	}
	if !hasPK {
		t.Error("Expected at least one table with a primary key")
	}

	// Verify at least one foreign key relationship exists
	hasFKs := false
	for _, table := range schema.Tables {
		fks := table.GetForeignKeys()
		if len(fks) > 0 {
			hasFKs = true
			// Verify foreign key properties
			for _, fk := range fks {
				if fk.Type != models.ForeignKeyConstraint {
					t.Error("Expected foreign key constraint type")
				}
				if len(fk.Columns) == 0 {
					t.Error("Foreign key should have at least one column")
				}
				if fk.ReferencedTable == "" {
					t.Error("Foreign key should have referenced table")
				}
				if len(fk.ReferencedColumns) == 0 {
					t.Error("Foreign key should have at least one referenced column")
				}
			}
			break
		}
	}
	if !hasFKs {
		t.Error("Expected at least one foreign key relationship")
	}

	// Verify indexes exist on some tables
	hasIndexes := false
	for _, table := range schema.Tables {
		if len(table.Indexes) > 0 {
			hasIndexes = true
			// Verify index properties
			for _, idx := range table.Indexes {
				if idx.Name == "" {
					t.Error("Index should have a name")
				}
				if len(idx.Columns) == 0 {
					t.Error("Index should have at least one column")
				}
			}
			break
		}
	}
	if !hasIndexes {
		t.Error("Expected at least one table with indexes")
	}
}

func TestReader_ReadSchema(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	schema, err := reader.ReadSchema()
	if err != nil {
		t.Fatalf("ReadSchema() error = %v", err)
	}

	if schema == nil {
		t.Fatal("ReadSchema() returned nil schema")
	}

	if schema.Name == "" {
		t.Error("Expected non-empty schema name")
	}

	if len(schema.Tables) == 0 {
		t.Fatal("Expected at least one table")
	}
}

func TestReader_ReadTable(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	table, err := reader.ReadTable()
	if err != nil {
		t.Fatalf("ReadTable() error = %v", err)
	}

	if table == nil {
		t.Fatal("ReadTable() returned nil table")
	}

	if table.Name == "" {
		t.Error("Expected non-empty table name")
	}

	if table.Schema == "" {
		t.Error("Expected non-empty schema name")
	}

	if len(table.Columns) == 0 {
		t.Error("Expected at least one column")
	}

	// Verify column properties
	for _, col := range table.Columns {
		if col.Name == "" {
			t.Error("Column should have a name")
		}
		if col.Type == "" {
			t.Error("Column should have a type")
		}
		if col.Table != table.Name {
			t.Errorf("Column table '%s' should match table name '%s'", col.Table, table.Name)
		}
		if col.Schema != table.Schema {
			t.Errorf("Column schema '%s' should match table schema '%s'", col.Schema, table.Schema)
		}
	}
}

func TestReader_ReadDatabase_InvalidPath(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: "/nonexistent/file.dctx",
	}

	reader := NewReader(opts)
	_, err := reader.ReadDatabase()
	if err == nil {
		t.Error("Expected error for invalid file path")
	}
}

func TestReader_ReadDatabase_EmptyPath(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: "",
	}

	reader := NewReader(opts)
	_, err := reader.ReadDatabase()
	if err == nil {
		t.Error("Expected error for empty file path")
	}
}

func TestReader_ReadSchema_EmptyPath(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: "",
	}

	reader := NewReader(opts)
	_, err := reader.ReadSchema()
	if err == nil {
		t.Error("Expected error for empty file path")
	}
}

func TestReader_ReadTable_EmptyPath(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: "",
	}

	reader := NewReader(opts)
	_, err := reader.ReadTable()
	if err == nil {
		t.Error("Expected error for empty file path")
	}
}

func TestGetPrimaryKey(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	db, err := reader.ReadDatabase()
	if err != nil {
		t.Fatalf("ReadDatabase() error = %v", err)
	}

	// Find a table with a primary key
	var tableName string
	var pk *models.Column
	for _, schema := range db.Schemas {
		for _, table := range schema.Tables {
			pk = table.GetPrimaryKey()
			if pk != nil {
				tableName = table.Name
				break
			}
		}
		if pk != nil {
			break
		}
	}

	if pk == nil {
		t.Fatal("Expected to find at least one table with a primary key")
	}

	if pk.Name == "" {
		t.Error("Primary key should have a name")
	}

	if !pk.IsPrimaryKey {
		t.Error("Primary key column should have IsPrimaryKey set to true")
	}

	t.Logf("Found primary key '%s' in table '%s'", pk.Name, tableName)
}

func TestGetForeignKeys(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	db, err := reader.ReadDatabase()
	if err != nil {
		t.Fatalf("ReadDatabase() error = %v", err)
	}

	// Find a table with foreign keys
	var tableName string
	var fks []*models.Constraint
	for _, schema := range db.Schemas {
		for _, table := range schema.Tables {
			fks = table.GetForeignKeys()
			if len(fks) > 0 {
				tableName = table.Name
				break
			}
		}
		if len(fks) > 0 {
			break
		}
	}

	if len(fks) == 0 {
		t.Fatal("Expected to find at least one table with foreign keys")
	}

	t.Logf("Found %d foreign keys in table '%s'", len(fks), tableName)

	// Verify foreign key structure
	for i, fk := range fks {
		if fk.Type != models.ForeignKeyConstraint {
			t.Errorf("FK %d: Expected foreign key constraint type", i)
		}
		if fk.Name == "" {
			t.Errorf("FK %d: Expected foreign key to have a name", i)
		}
		if len(fk.Columns) == 0 {
			t.Errorf("FK %d: Expected foreign key to have at least one column", i)
		}
		if fk.ReferencedTable == "" {
			t.Errorf("FK %d: Expected foreign key to have a referenced table", i)
		}
		if len(fk.ReferencedColumns) == 0 {
			t.Errorf("FK %d: Expected foreign key to have at least one referenced column", i)
		}

		t.Logf("FK %d: %s.%s -> %s.%s",
			i,
			tableName,
			fk.Columns,
			fk.ReferencedTable,
			fk.ReferencedColumns,
		)
	}
}

func TestDatabaseStructure(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	db, err := reader.ReadDatabase()
	if err != nil {
		t.Fatalf("ReadDatabase() error = %v", err)
	}

	// Comprehensive structure validation
	for _, schema := range db.Schemas {
		if schema.Name == "" {
			t.Error("Schema should have a name")
		}

		for _, table := range schema.Tables {
			if table.Name == "" {
				t.Error("Table should have a name")
			}
			if table.Schema == "" {
				t.Error("Table should have a schema")
			}

			// Verify columns
			for _, col := range table.Columns {
				if col.Name == "" {
					t.Errorf("Column in table '%s' should have a name", table.Name)
				}
				if col.Type == "" {
					t.Errorf("Column '%s' in table '%s' should have a type", col.Name, table.Name)
				}
				if col.Table != table.Name {
					t.Errorf("Column '%s' table reference should match table name", col.Name)
				}
				if col.Schema != table.Schema {
					t.Errorf("Column '%s' schema reference should match table schema", col.Name)
				}
			}

			// Verify constraints
			for _, constraint := range table.Constraints {
				if constraint.Name == "" {
					t.Errorf("Constraint in table '%s' should have a name", table.Name)
				}
				if constraint.Type == "" {
					t.Errorf("Constraint '%s' should have a type", constraint.Name)
				}
				if constraint.Table != table.Name {
					t.Errorf("Constraint '%s' table reference should match table name", constraint.Name)
				}
			}

			// Verify indexes
			for _, index := range table.Indexes {
				if index.Name == "" {
					t.Errorf("Index in table '%s' should have a name", table.Name)
				}
				if len(index.Columns) == 0 {
					t.Errorf("Index '%s' should have at least one column", index.Name)
				}
				if index.Table != table.Name {
					t.Errorf("Index '%s' table reference should match table name", index.Name)
				}
			}
		}
	}
}

func TestColumnProperties(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	db, err := reader.ReadDatabase()
	if err != nil {
		t.Fatalf("ReadDatabase() error = %v", err)
	}

	// Find various column types
	hasNotNullColumn := false
	hasNullableColumn := false
	hasDefaultValue := false

	for _, schema := range db.Schemas {
		for _, table := range schema.Tables {
			for _, col := range table.Columns {
				if col.NotNull {
					hasNotNullColumn = true
				} else {
					hasNullableColumn = true
				}
				if col.Default != nil {
					hasDefaultValue = true
				}
			}
		}
	}

	if !hasNotNullColumn {
		t.Log("Note: No NOT NULL columns found (this may be valid for the test data)")
	}
	if !hasNullableColumn {
		t.Log("Note: No nullable columns found (this may be valid for the test data)")
	}
	if !hasDefaultValue {
		t.Log("Note: No columns with default values found (this may be valid for the test data)")
	}
}

func TestRelationships(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "examples", "dctx", "example.dctx"),
	}

	reader := NewReader(opts)
	db, err := reader.ReadDatabase()
	if err != nil {
		t.Fatalf("ReadDatabase() error = %v", err)
	}

	// Count total relationships across all tables
	relationshipCount := 0
	for _, schema := range db.Schemas {
		for _, table := range schema.Tables {
			relationshipCount += len(table.Relationships)
		}
	}

	// The example.dctx file should have a significant number of relationships
	// With the fix for nested field GUID mapping, we expect around 100+ relationships
	if relationshipCount < 50 {
		t.Errorf("Expected at least 50 relationships, got %d. This may indicate relationships are not being parsed correctly", relationshipCount)
	}

	t.Logf("Successfully parsed %d relationships", relationshipCount)

	// Verify relationship properties
	for _, schema := range db.Schemas {
		for _, table := range schema.Tables {
			for _, rel := range table.Relationships {
				if rel.Name == "" {
					t.Errorf("Relationship in table '%s' should have a name", table.Name)
				}
				if rel.FromTable == "" {
					t.Errorf("Relationship '%s' should have a from table", rel.Name)
				}
				if rel.ToTable == "" {
					t.Errorf("Relationship '%s' should have a to table", rel.Name)
				}
				if rel.ForeignKey == "" {
					t.Errorf("Relationship '%s' should reference a foreign key", rel.Name)
				}
			}
		}
	}
}