package json

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("..", "..", "..", "tests", "assets", "json", "database.json"),
	}

	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 != "test_db" {
		t.Errorf("Expected database name 'test_db', got '%s'", db.Name)
	}

	if db.Description != "Test database for JSON reader" {
		t.Errorf("Expected description 'Test database for JSON reader', got '%s'", db.Description)
	}

	if db.DatabaseType != models.PostgresqlDatabaseType {
		t.Errorf("Expected database type 'pgsql', got '%s'", db.DatabaseType)
	}

	if len(db.Schemas) != 1 {
		t.Fatalf("Expected 1 schema, got %d", len(db.Schemas))
	}

	schema := db.Schemas[0]
	if schema.Name != "public" {
		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
	}

	if len(schema.Tables) != 2 {
		t.Fatalf("Expected 2 tables, got %d", len(schema.Tables))
	}

	// Find users table
	var usersTable *models.Table
	for _, table := range schema.Tables {
		if table.Name == "users" {
			usersTable = table
			break
		}
	}

	if usersTable == nil {
		t.Fatal("Users table not found")
	}

	if usersTable.Description != "User accounts table" {
		t.Errorf("Expected table description 'User accounts table', got '%s'", usersTable.Description)
	}

	if len(usersTable.Columns) != 4 {
		t.Errorf("Expected 4 columns, got %d", len(usersTable.Columns))
	}

	// Verify id column
	idCol, exists := usersTable.Columns["id"]
	if !exists {
		t.Fatal("Column 'id' not found")
	}
	if !idCol.IsPrimaryKey {
		t.Error("Column 'id' should be primary key")
	}
	if !idCol.AutoIncrement {
		t.Error("Column 'id' should be auto-increment")
	}
	if !idCol.NotNull {
		t.Error("Column 'id' should be not null")
	}
	if idCol.Type != "bigint" {
		t.Errorf("Expected id type 'bigint', got '%s'", idCol.Type)
	}

	// Verify email column
	emailCol, exists := usersTable.Columns["email"]
	if !exists {
		t.Fatal("Column 'email' not found")
	}
	if !emailCol.NotNull {
		t.Error("Column 'email' should be not null")
	}
	if emailCol.Type != "varchar" {
		t.Errorf("Expected email type 'varchar', got '%s'", emailCol.Type)
	}
	if emailCol.Length != 255 {
		t.Errorf("Expected email length 255, got %d", emailCol.Length)
	}
	if emailCol.Comment != "User email address" {
		t.Errorf("Expected email comment 'User email address', got '%s'", emailCol.Comment)
	}

	// Verify created_at column with default
	createdCol, exists := usersTable.Columns["created_at"]
	if !exists {
		t.Fatal("Column 'created_at' not found")
	}
	if createdCol.Default == nil {
		t.Error("Expected default value for created_at")
	}
	if createdCol.Default != "CURRENT_TIMESTAMP" {
		t.Errorf("Expected default 'CURRENT_TIMESTAMP', got '%v'", createdCol.Default)
	}

	// Verify index
	if len(usersTable.Indexes) != 1 {
		t.Errorf("Expected 1 index, got %d", len(usersTable.Indexes))
	}

	emailIdx, exists := usersTable.Indexes["idx_users_email"]
	if !exists {
		t.Fatal("Index 'idx_users_email' not found")
	}
	if !emailIdx.Unique {
		t.Error("Email index should be unique")
	}
	if len(emailIdx.Columns) != 1 || emailIdx.Columns[0] != "email" {
		t.Error("Email index should have 'email' column")
	}
	if emailIdx.Type != "btree" {
		t.Errorf("Expected index type 'btree', got '%s'", emailIdx.Type)
	}

	// Find posts table and verify foreign key
	var postsTable *models.Table
	for _, table := range schema.Tables {
		if table.Name == "posts" {
			postsTable = table
			break
		}
	}

	if postsTable == nil {
		t.Fatal("Posts table not found")
	}

	if len(postsTable.Constraints) != 1 {
		t.Errorf("Expected 1 constraint, got %d", len(postsTable.Constraints))
	}

	fk, exists := postsTable.Constraints["fk_posts_user"]
	if !exists {
		t.Fatal("Foreign key 'fk_posts_user' not found")
	}
	if fk.Type != models.ForeignKeyConstraint {
		t.Error("Expected foreign key constraint type")
	}
	if fk.ReferencedTable != "users" {
		t.Errorf("Expected referenced table 'users', got '%s'", fk.ReferencedTable)
	}
	if fk.ReferencedSchema != "public" {
		t.Errorf("Expected referenced schema 'public', got '%s'", fk.ReferencedSchema)
	}
	if len(fk.Columns) != 1 || fk.Columns[0] != "user_id" {
		t.Error("Expected FK column 'user_id'")
	}
	if len(fk.ReferencedColumns) != 1 || fk.ReferencedColumns[0] != "id" {
		t.Error("Expected FK referenced column 'id'")
	}
	if fk.OnDelete != "CASCADE" {
		t.Errorf("Expected ON DELETE CASCADE, got '%s'", fk.OnDelete)
	}
	if fk.OnUpdate != "CASCADE" {
		t.Errorf("Expected ON UPDATE CASCADE, got '%s'", fk.OnUpdate)
	}
}

func TestReader_ReadSchema(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "json", "schema.json"),
	}

	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 != "public" {
		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
	}

	if schema.Description != "Public schema" {
		t.Errorf("Expected description 'Public schema', got '%s'", schema.Description)
	}

	if len(schema.Tables) != 1 {
		t.Errorf("Expected 1 table, got %d", len(schema.Tables))
	}

	table := schema.Tables[0]
	if table.Name != "users" {
		t.Errorf("Expected table name 'users', got '%s'", table.Name)
	}

	if len(table.Columns) != 2 {
		t.Errorf("Expected 2 columns, got %d", len(table.Columns))
	}

	// Verify username column
	usernameCol, exists := table.Columns["username"]
	if !exists {
		t.Fatal("Column 'username' not found")
	}
	if usernameCol.Type != "varchar" {
		t.Errorf("Expected username type 'varchar', got '%s'", usernameCol.Type)
	}
	if usernameCol.Length != 50 {
		t.Errorf("Expected username length 50, got %d", usernameCol.Length)
	}
}

func TestReader_ReadTable(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "json", "table.json"),
	}

	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 != "users" {
		t.Errorf("Expected table name 'users', got '%s'", table.Name)
	}

	if table.Schema != "public" {
		t.Errorf("Expected schema 'public', got '%s'", table.Schema)
	}

	if table.Description != "Users table" {
		t.Errorf("Expected description 'Users table', got '%s'", table.Description)
	}

	if len(table.Columns) != 2 {
		t.Errorf("Expected 2 columns, got %d", len(table.Columns))
	}

	// Verify columns
	idCol, exists := table.Columns["id"]
	if !exists {
		t.Fatal("Column 'id' not found")
	}
	if !idCol.IsPrimaryKey {
		t.Error("Column 'id' should be primary key")
	}

	emailCol, exists := table.Columns["email"]
	if !exists {
		t.Fatal("Column 'email' not found")
	}
	if emailCol.Length != 255 {
		t.Errorf("Expected email length 255, got %d", emailCol.Length)
	}
}

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

	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("..", "..", "..", "tests", "assets", "json", "table.json"),
	}

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

	pk := table.GetPrimaryKey()
	if pk == nil {
		t.Fatal("Expected primary key, got nil")
	}

	if pk.Name != "id" {
		t.Errorf("Expected primary key name 'id', got '%s'", pk.Name)
	}
}

func TestGetForeignKeys(t *testing.T) {
	opts := &readers.ReaderOptions{
		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "json", "database.json"),
	}

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

	// Find posts table
	var postsTable *models.Table
	for _, schema := range db.Schemas {
		for _, table := range schema.Tables {
			if table.Name == "posts" {
				postsTable = table
				break
			}
		}
	}

	if postsTable == nil {
		t.Fatal("Posts table not found")
	}

	fks := postsTable.GetForeignKeys()
	if len(fks) != 1 {
		t.Errorf("Expected 1 foreign key, got %d", len(fks))
	}

	if len(fks) > 0 && fks[0].Type != models.ForeignKeyConstraint {
		t.Error("Expected foreign key constraint type")
	}
}