namespace KumiScript.Renderer
{
    public class Text : InterfaceElement
    {
        readonly string _text;
        readonly ManagedFont _font;
        string[]? _words;
        int _progress;
        int _animProg;
        readonly int _charcount;

        public Text(string text, ManagedFont font)
        {
            _text = text;
            _font = font;
            _progress = 0;
            _animProg = -24;
            _charcount = text.Length;
        }

        public override void Click()
        {
            return;
        }

        public override void Draw(int x, int y)
        {
            foreach (char c in _text)
            {
                Glyph g = _font.GetGlyph(c);
                g.DrawAdvancePen(x, y, out x);
            }
        }

        public virtual void DrawWrapping(int x, int y, int maxw, int spacing, int retw, char delim, out int penx, out int peny)
        {
            if (_words is null)
                _words = _text.Split(delim);

            int spacew = _font.GetGlyph(delim).GetWidth();
            penx = x;
            peny = y;
            foreach (string word in _words)
            {
                int w = 0;
                Glyph[] gs = new Glyph[word.Length];
                for (int i = 0; i < word.Length; i++)
                {
                    gs[i] = _font.GetGlyph(word[i]);
                    w += gs[i].GetWidth();
                }
                if (penx + w >= maxw)
                {
                    penx = retw;
                    peny += spacing;
                }
                foreach (Glyph g in gs)
                    g.DrawAdvancePen(penx, peny, out penx);
                
                penx += spacew;
            }
            return;
        }

        public virtual bool DrawWrappingAnimate(int x, int y, int maxw, int spacing, int retw, char delim, out int penx, out int peny)
        {
            int c = 2;
            int dist;
            _animProg += 24;
            if (_words is null)
                _words = _text.Split(delim);

            int spacew = _font.GetGlyph(delim).GetWidth();
            penx = x;
            peny = y;
            foreach (string word in _words)
            {
                int w = 0;
                Glyph[] gs = new Glyph[word.Length];
                for (int i = 0; i < word.Length; i++)
                {
                    gs[i] = _font.GetGlyph(word[i]);
                    w += gs[i].GetWidth();
                }
                if (penx + w >= maxw)
                {
                    penx = retw;
                    peny += spacing;
                }
                foreach (Glyph g in gs)
                {
                    if (_animProg >= 60)
                    {
                        _animProg = 0;
                        _progress++;
                    }
                    dist = _progress - c;
                    if (dist > 0)
                    {
                        g.DrawAdvancePen(penx, peny, out penx);
                        c++;
                    }
                    else if (dist < -4)
                    {
                        return false;
                    }
                    else
                    {
                        g.DrawAdvancePenModAlpha(penx, peny, out penx, (byte) (255 + dist * 42));
                        c++;
                    }
                }
                penx += spacew;
            }
            return true;
        }

        public override int GetBitmapHeight()
        {
            throw new NotImplementedException();
        }

        public override int GetBitmapWidth()
        {
            throw new NotImplementedException();
        }

        public override void OnMouseout()
        {
            return;
        }

        public override void OnMouseover()
        {
            return;
        }

        public void ForceProgress()
        {
            _progress = _charcount;
            return;
        }

        public override void Dispose()
        {
            return;
        }
    }
}