// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace Microsoft.Build.Framework.Logging;

/// <summary>
/// A collection of standard ANSI/VT100 control codes.
/// </summary>
internal static class AnsiCodes
{
    /// <summary>
    /// The control sequence introducer.
    /// </summary>
    public const string CSI = "\x1b[";

    /// <summary>
    /// Select graphic rendition.
    /// </summary>
    /// <remarks>
    /// Print <see cref="CSI"/>color-code<see cref="SetColor"/> to change text color.
    /// </remarks>
    public const string SetColor = ";1m";

    /// <summary>
    /// Select graphic rendition - set bold mode.
    /// </summary>
    /// <remarks>
    /// Print <see cref="CSI"/><see cref="SetBold"/> to change text to bold.
    /// </remarks>
    public const string SetBold = "1m";

    /// <summary>
    /// A shortcut to reset color back to normal.
    /// </summary>
    public const string SetDefaultColor = CSI + "m";

    /// <summary>
    /// Non-xterm extension to render a hyperlink.
    /// </summary>
    /// <remarks>
    /// Print <see cref="LinkPrefix"/>url<see cref="LinkInfix"/>text<see cref="LinkSuffix"/> to render a hyperlink.
    /// </remarks>
    public const string LinkPrefix = "\x1b]8;;";

    /// <summary>
    /// <see cref="LinkPrefix"/>
    /// </summary>
    public const string LinkInfix = "\x1b\\";

    /// <summary>
    /// <see cref="LinkPrefix"/>
    /// </summary>
    public const string LinkSuffix = "\x1b]8;;\x1b\\";

    /// <summary>
    /// Moves up the specified number of lines and puts cursor at the beginning of the line.
    /// </summary>
    /// <remarks>
    /// Print <see cref="CSI"/>N<see cref="MoveUpToLineStart"/> to move N lines up.
    /// </remarks>
    public const string MoveUpToLineStart = "F";

    /// <summary>
    /// Moves forward (to the right) the specified number of characters.
    /// </summary>
    /// <remarks>
    /// Print <see cref="CSI"/>N<see cref="MoveForward"/> to move N characters forward.
    /// </remarks>
    public const string MoveForward = "C";

    /// <summary>
    /// Moves backward (to the left) the specified number of characters.
    /// </summary>
    /// <remarks>
    /// Print <see cref="CSI"/>N<see cref="MoveBackward"/> to move N characters backward.
    /// </remarks>
    public const string MoveBackward = "D";

    /// <summary>
    /// Clears everything from cursor to end of screen.
    /// </summary>
    /// <remarks>
    /// Print <see cref="CSI"/><see cref="EraseInDisplay"/> to clear.
    /// </remarks>
    public const string EraseInDisplay = "J";

    /// <summary>
    /// Clears everything from cursor to the end of the current line.
    /// </summary>
    /// <remarks>
    /// Print <see cref="CSI"/><see cref="EraseInLine"/> to clear.
    /// </remarks>
    public const string EraseInLine = "K";

    /// <summary>
    /// Hides the cursor.
    /// </summary>
    public const string HideCursor = "\x1b[?25l";

    /// <summary>
    /// Shows/restores the cursor.
    /// </summary>
    public const string ShowCursor = "\x1b[?25h";

    /// <summary>
    /// Set progress state to a busy spinner. <br/>
    /// Note: this code works only on ConEmu terminals, and conflicts with push a notification code on iTerm2.
    /// </summary>
    /// <remarks>
    /// <see href="https://conemu.github.io/en/AnsiEscapeCodes.html#ConEmu_specific_OSC">ConEmu specific OSC codes.</see><br/>
    /// <see href="https://iterm2.com/documentation-escape-codes.html">iTerm2 proprietary escape codes.</see>
    /// </remarks>
    public const string SetProgressIndeterminate = "\x1b]9;4;3;\x1b\\";

    /// <summary>
    /// Remove progress state, restoring taskbar status to normal. <br/>
    /// Note: this code works only on ConEmu terminals, and conflicts with push a notification code on iTerm2.
    /// </summary>
    /// <remarks>
    /// <see href="https://conemu.github.io/en/AnsiEscapeCodes.html#ConEmu_specific_OSC">ConEmu specific OSC codes.</see><br/>
    /// <see href="https://iterm2.com/documentation-escape-codes.html">iTerm2 proprietary escape codes.</see>
    /// </remarks>
    public const string RemoveProgress = "\x1b]9;4;0;\x1b\\";

    public static string Colorize(string? s, TerminalColor color)
    {
        if (string.IsNullOrWhiteSpace(s))
        {
            return s ?? "";
        }

        return $"{CSI}{(int)color}{SetColor}{s}{SetDefaultColor}";
    }

    public static string MakeBold(string? s)
    {
        if (string.IsNullOrWhiteSpace(s))
        {
            return s ?? "";
        }

        return $"{CSI}{SetBold}{s}{SetDefaultColor}";
    }

    public static string MoveCursorBackward(int count) => $"{CSI}{count}{MoveBackward}";

    /// <summary>
    /// Moves cursor to the specified column, or the rightmost column if <paramref name="column"/> is greater than the width of the terminal.
    /// </summary>
    /// <param name="column">Column index.</param>
    /// <returns>Control codes to set the desired position.</returns>
    public static string SetCursorHorizontal(int column) => $"{CSI}{column}G";
}