using System;

namespace WasmBox.Pixie.Terminal {
    /// <summary>
    /// A base class for end-of-the line terminals that produce output.
    /// It helps build separators properly.
    /// </summary>
    public abstract class OutputTerminalBase : TerminalBase {
        private int sepLineCounter;

        /// <summary>
        /// Writes a raw newline to the output.
        /// </summary>
        protected abstract void WriteLineImpl();

        /// <inheritdoc/>
        public sealed override void WriteLine() {
            WriteSeparator(1);
        }

        /// <inheritdoc/>
        public override void WriteSeparator(int lineCount) {
            int oldSepLineCounter = sepLineCounter;
            sepLineCounter = Math.Max(lineCount, sepLineCounter);
            for (int i = oldSepLineCounter; i < sepLineCounter; i++) {
                WriteLineImpl();
            }
        }

        /// <summary>
        /// Hints that the end of a separator has been reached.
        /// </summary>
        protected void EndSeparator() {
            sepLineCounter = 0;
        }
    }
}