@testable import Trio
import XCTest

final class SettingsExportTests: XCTestCase {
    func testCSVEscaping() {
        // Test CSV escaping functionality
        let testValue = "Test,Value\"With\nSpecial Characters"
        let escaped = csvEscape(testValue)
        let expected = "\"Test,Value\"\"With\nSpecial Characters\""
        XCTAssertEqual(escaped, expected, "CSV escaping should handle commas, quotes, and newlines")
    }

    func testCSVEscapingSimple() {
        // Test simple values don't get escaped
        let testValue = "SimpleValue"
        let escaped = csvEscape(testValue)
        XCTAssertEqual(escaped, testValue, "Simple values should not be escaped")
    }

    func testExportCSVStructure() {
        // Test that the CSV has the expected header structure
        let expectedHeader = "Setting Category,Subcategory,Setting Name,Value,Unit"
        // This test would require mocking the settings manager and file storage
        // For now, we verify the header format is correct
        XCTAssertEqual(expectedHeader.components(separatedBy: ",").count, 5, "CSV header should have 5 columns")
    }

    func testExportErrorTypes() {
        // Test that our export error types are properly defined
        let documentError = Settings.StateModel.ExportError.documentsDirectoryNotFound
        XCTAssertNotNil(documentError.errorDescription, "Document error should have description")

        let writeError = Settings.StateModel.ExportError.fileWriteError(TestError.testError)
        XCTAssertNotNil(writeError.errorDescription, "Write error should have description")

        let unknownError = Settings.StateModel.ExportError.unknown("Test message")
        XCTAssertNotNil(unknownError.errorDescription, "Unknown error should have description")
    }

    func testExportFileNaming() {
        // Test that export files have the correct naming pattern
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyyMMdd_HHmmss"
        let timestamp = formatter.string(from: Date())
        let fileName = "TrioSettings_\(timestamp).csv"

        XCTAssertTrue(fileName.hasPrefix("TrioSettings_"), "File name should start with TrioSettings_")
        XCTAssertTrue(fileName.hasSuffix(".csv"), "File name should end with .csv")
        XCTAssertEqual(fileName.components(separatedBy: "_").count, 2, "File name should have one underscore")
    }

    // Helper function to test CSV escaping (extracted from Settings.StateModel)
    private func csvEscape(_ value: String) -> String {
        if value.contains(",") || value.contains("\"") || value.contains("\n") {
            return "\"\(value.replacingOccurrences(of: "\"", with: "\"\""))\""
        }
        return value
    }
}