using System.Collections.Generic;
using System.Text;
using System;
using System.Linq;
public class Song
{
    public List<string> nazev = new List<string>();
    public List<string> title = new List<string>();
    public List<string> remix = new List<string>();

    public Song(string song)
    {
        string n, t, r;
        ManazerNazvuMedii.ci.VratMiNazevTitleRemix(song, out n, out t, out r);
        this.nazev.AddRange(SplitNazevTitle(n));
        this.title.AddRange(SplitNazevTitle(t));
        this.remix.AddRange(SplitRemix(r));

        //if (this.remix.Count != 0)
        //{

        //}
    }

    internal float CalculateSimilarity(string p)
    {
        Song s = new Song(p);
        int psn, prn, pst, prt, psr, prr;
        VratPocetStejnychARozdilnych(s.nazev, this.nazev, out psn, out prn);
        VratPocetStejnychARozdilnych(s.title, this.title, out pst, out prt);
        VratPocetStejnychARozdilnych(s.remix, this.remix, out psr, out prr);

        float n = CalculateSimilarity(psn, prn, s.nazev, this.nazev);
        float t = CalculateSimilarity(pst, prt, s.title, this.title);
        float r = CalculateSimilarity(psr, prr, s.remix, this.remix);

        float vr = (n + t) / 2;
        //if (vr > 0.66f)
        //{
        //    if (vr == 1)
        //    {

        //    }
        //    return vr;
        //}
        //
        if (vr == 1)
        {
            vr = (n + t + r) / 3;
        }
        return vr;
    }

    private float CalculateSimilarity(int psn, int prn, List<string> novy, List<string> puvodni)
    {
        if (psn == prn && psn == 0)
        {
            return 1.0f;
        }
        if (psn > prn)
        {
            //prn == 1 ||
            if (prn == 0)
            {
                int uy = 0;
                for (int i = 0; i < novy.Count; i++)
                {
                    if (puvodni.Contains(novy[i]))
                    {
                        uy++;
                    }
                }
                if (uy == novy.Count)
                {
                    return 1.0f;
                }
                //return 1.0f;
                return (1f / 3f) * 2f;
            }
            if (prn != 0)
            {
                if (prn != 1)
                {

                    return psn / prn;
                }
                if (psn > 3)
                {
                    float vr = (psn - prn) / 2f;

                    return vr;
                }
                else
                {
                    float vr = (psn - ((float)psn / ((float)psn - 1f))) / 2;
                    int uy = 0;
                    for (int i = 0; i < novy.Count; i++)
                    {
                        if (puvodni.Contains(novy[i]))
                        {
                            uy++;
                        }
                    }
                    if (uy > 0)
                    {
                        vr = (float)uy / (float)prn / 2f;
                    }
                    if (vr > 0.99f)
                    {
                        vr = vr / 2f;
                    }
                    return vr;
                }
                //return 0.5f;
            }


            return 0f;
        }
        if (psn + 1 > prn && psn < 3)
        {
            return 0.5f;
        }

        return 0f;

    }

    private void VratPocetStejnychARozdilnych(List<string> list, List<string> list_2, out int psn, out int prn)
    {
        List<string> l1 = new List<string>(list.ToArray());
        List<string> l2 = new List<string>(list_2.ToArray());
        psn = 0;


        for (int i = l1.Count - 1; i >= 0; i--)
        {
            int dex = l2.IndexOf(l1[i]);
            if (dex != -1)
            {
                l1.RemoveAt(i);
                l2.RemoveAt(dex);
                psn++;
            }
        }

        prn = (l1.Count + l2.Count) ;
    }

    public override string ToString()
    {
        StringBuilder vr = new StringBuilder();
        vr.Append(JoinSpace(nazev) + "-" + JoinSpace(title));
        if (remix.Count != 0)
        {
            vr.Append(" [" + JoinSpace(remix) + "]");
        }
        return vr.ToString();
    }

    private IEnumerable<string> SplitRemix(string u)
    {
        //return u.Split(new string[] { " ", "[", "]", "(", ")" }, StringSplitOptions.RemoveEmptyEntries).All(g => g.ToLower()); ;

        List<string> gg = u.Split(new string[] { " ", "[", "]", "(", ")" }, StringSplitOptions.RemoveEmptyEntries).ToList();
        //gg.ForEach(g => g.ToLower());
        for (int i = 0; i < gg.Count; i++)
        {
            gg[i] = gg[i].ToLower();
        }
        return gg;
    }

    private IEnumerable<string> SplitNazevTitle(string u)
    {
        List<string> gg = u.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries).ToList();
        //gg.ForEach(g => g.ToLower());
        for (int i = 0; i < gg.Count; i++)
        {
            gg[i] = gg[i].ToLower();
        }
        return gg;
    }

    private string JoinSpace(List<string> nazev)
    {
        StringBuilder sb = new StringBuilder();
        foreach (string item in nazev)
        {
            sb.Append(item + " ");
        }
        return sb.ToString().TrimEnd(' ');
    }
}