using System.Drawing;
using System.Windows.Forms;

namespace FastReport.Utils
{
    /// <summary>
    /// Storage service for form's controls.
    /// </summary>
    public class ControlStorageService : StorageService
    {
        private Control control;

        /// <summary>
        /// Use device independent pixels (measured in 96dpi mode).
        /// </summary>
        public bool UseDips { get; set; }

        private int ToDip(int value) => UseDips ? (int)(value / control.DpiMultiplier()) : value;

        private int ToPix(int value) => UseDips ? (int)(value * control.DpiMultiplier()) : value;

        /// <summary>
        /// Gets value in device-independent pixels (dips) and converts it to pixels. Takes <see cref="UseDips"/> property into account.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="defaultValue">Default value.</param>
        /// <param name="minValue">Minimum value.</param>
        /// <param name="maxValue">Maximum value.</param>
        /// <returns>Value in dips.</returns>
        public int GetDip(string key, int defaultValue = 0, int minValue = int.MinValue, int maxValue = int.MaxValue)
        {
            int result = ToPix(GetInt(key, defaultValue));
            if (result < minValue)
                result = minValue;
            if (result > maxValue)
                result = maxValue;
            return result;
        }

        /// <summary>
        /// Stores value in device-independent pixels (dips). Takes <see cref="UseDips"/> property into account.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="value">Value.</param>
        public void SetDip(string key, int value) => SetInt(key, ToDip(value));

        /// <summary>
        /// Gets font from font storage.
        /// </summary>
        /// <param name="path">Path to font storage.</param>
        /// <param name="defaultFont">Default value.</param>
        /// <returns>The font object.</returns>
        public Font GetFont(string path, Font defaultFont)
        {
            var fs = new StorageService("Designer,Fonts," + path);

            string fontName = fs.GetStr("font-name", defaultFont.Name);
            float fontSize = fs.GetFloat("font-size", defaultFont.Size);
            bool bold = fs.GetBool("font-bold");
            bool italic = fs.GetBool("font-italic");

            return new Font(fontName, fontSize, (italic ? FontStyle.Italic : 0) | (bold ? FontStyle.Bold : 0));
        }

        /// <summary>
        /// Initializes a new instance of storage class.
        /// </summary>
        /// <param name="control">The control which dpi setting is used to save/restore dips.</param>
        /// <param name="path">The root path.</param>
        public ControlStorageService(Control control, string path) : base(path)
        {
            this.control = control;
#if (WPF || AVALONIA)
            UseDips = true;
#endif
        }
    }
}