using System;
using System.Globalization;
using UnityEngine;

namespace Luneraria.UI
{
    /// <summary>
    /// Colours and number formats of the Champions of Luneraria HUD (port of
    /// scripts/luneraria/ui/theme/lune_ui_theme.gd and the colours of the Saumwacht menu theme it
    /// extends): dark blue-anthracite plates, bronze and gold only on what the player can act on,
    /// quiet team accents. Colours are sRGB, as in Godot.
    /// </summary>
    public static class LuneUiTheme
    {
        public static readonly Color SlateTop = new Color(.075f, .1f, .135f, .9f);
        public static readonly Color SlateBottom = new Color(.05f, .068f, .094f, .93f);
        public static readonly Color Edge = Hex("2b3848");
        public static readonly Color EdgeLight = Hex("455870");
        public static readonly Color Text = Hex("ebe5d8");
        public static readonly Color Bright = Hex("f6eedc");
        public static readonly Color Muted = Hex("9aa4b0");
        public static readonly Color Faint = Hex("6a7480");
        public static readonly Color Gold = Hex("f2c96b");
        // Saumwacht menu theme (saumwacht_theme.gd).
        public static readonly Color Bronze = Hex("b7874a");
        public static readonly Color BronzeLight = Hex("e4bd7c");
        public static readonly Color BronzeDeep = Hex("6b4f2e");
        public static readonly Color Ink = Hex("1a120a");
        public static readonly Color Focus = Hex("f6e2b0");
        public static readonly Color Parchment = Hex("efe6d2");
        /// <summary>Team accents: Blau (cool, crescent moon), Rot (warm, sun disc), neutral grotto (violet).</summary>
        public static readonly Color[] Team = { Hex("6cb4ff"), Hex("ff7b5e"), Hex("b78cff") };
        public static readonly Color[] TeamDark = { Hex("1c3f6a"), Hex("722a1f"), Hex("45305f") };
        public static readonly string[] TeamNames = { "Blau", "Rot", "Grotte" };
        public static readonly string[] TeamEmblems = { "Mondsichel", "Sonnenscheibe", "Grotte" };
        /// <summary>Threat levels RUHIG, UMKÄMPFT, UNTER DRUCK, KRITISCH.</summary>
        public static readonly Color[] Threat = { Hex("7cc9a6"), Hex("e5c35e"), Hex("ff9448"), Hex("ff584a") };
        public static readonly Color Champion = Hex("e2a15e");
        public static readonly Color Hero = Hex("f2c96b");
        public static readonly Color Good = Hex("8fdcb4");
        public static readonly Color Warn = Hex("f0c060");
        public static readonly Color Danger = Hex("ff6a55");
        public static readonly Color Info = Hex("a9c6e8");
        /// <summary>Lower bound for any HUD text: 14 logical px stay above 10 px at 1280×720.</summary>
        public const int MinFont = 14;

        public static Color Hex(string hex)
        {
            if (!ColorUtility.TryParseHtmlString("#" + hex, out Color color))
                throw new ArgumentException("Bad colour " + hex);
            return color;
        }

        /// <summary>Godot Color.darkened: rgb times (1 - amount), alpha kept.</summary>
        public static Color Darkened(Color color, float amount)
        {
            return new Color(color.r * (1f - amount), color.g * (1f - amount), color.b * (1f - amount), color.a);
        }

        /// <summary>Godot Color.lightened: rgb towards white by amount, alpha kept.</summary>
        public static Color Lightened(Color color, float amount)
        {
            return new Color(color.r + (1f - color.r) * amount, color.g + (1f - color.g) * amount, color.b + (1f - color.b) * amount, color.a);
        }

        public static Color WithAlpha(Color color, float alpha)
        {
            return new Color(color.r, color.g, color.b, alpha);
        }

        public static Color TeamColor(int team)
        {
            return Team[Mathf.Clamp(team, 0, 2)];
        }

        public static string TeamName(int team)
        {
            return TeamNames[Mathf.Clamp(team, 0, 2)];
        }

        /// <summary>Whole numbers with German thousands separators (12.000), rounded like Godot (half away from zero).</summary>
        public static string Number(double value)
        {
            long whole = (long)Math.Round(value, MidpointRounding.AwayFromZero);
            string digits = Math.Abs(whole).ToString(CultureInfo.InvariantCulture);
            string result = "";
            while (digits.Length > 3)
            {
                result = "." + digits.Substring(digits.Length - 3) + result;
                digits = digits.Substring(0, digits.Length - 3);
            }
            return (whole < 0 ? "-" : "") + digits + result;
        }

        /// <summary>Fixed decimals with a decimal comma (Godot: "%.1f" % value with "." replaced).</summary>
        public static string Decimal(double value, int places = 1)
        {
            return value.ToString("F" + places, CultureInfo.InvariantCulture).Replace(".", ",");
        }

        /// <summary>Godot round(): half away from zero.</summary>
        public static int Round(double value)
        {
            return (int)Math.Round(value, MidpointRounding.AwayFromZero);
        }
    }
}