using System;
using System.Collections.Generic;
using Server.Gumps;
using Server.Network;

namespace Server.Engines.VeteranRewards
{
  public class RewardChoiceGump : Gump
  {
    private readonly Mobile m_From;

    public RewardChoiceGump(Mobile from) : base(0, 0)
    {
      m_From = from;

      from.CloseGump<RewardChoiceGump>();

      RenderBackground();
      RenderCategories();
    }

    private void RenderBackground()
    {
      AddPage(0);

      AddBackground(10, 10, 600, 450, 2600);

      AddButton(530, 415, 4017, 4019, 0);

      AddButton(60, 415, 4014, 4016, 0, GumpButtonType.Page, 1);
      AddHtmlLocalized(95, 415, 200, 20, 1049755); // Main Menu
    }

    private void RenderCategories()
    {
      TimeSpan rewardInterval = RewardSystem.RewardInterval;

      string intervalAsString;

      if (rewardInterval == TimeSpan.FromDays(30.0))
        intervalAsString = "month";
      else if (rewardInterval == TimeSpan.FromDays(60.0))
        intervalAsString = "two months";
      else if (rewardInterval == TimeSpan.FromDays(90.0))
        intervalAsString = "three months";
      else if (rewardInterval == TimeSpan.FromDays(365.0))
        intervalAsString = "year";
      else
        intervalAsString = $"{rewardInterval.TotalDays} day{(rewardInterval.TotalDays == 1 ? "" : "s")}";

      AddPage(1);

      AddHtml(60, 35, 500, 70,
        $"<B>Ultima Online Rewards Program</B><BR>Thank you for being a part of the Ultima Online community for a full {intervalAsString}.  As a token of our appreciation,  you may select from the following in-game reward items listed below.  The gift items will be attributed to the character you have logged-in with on the shard you are on when you chose the item(s).  The number of rewards you are entitled to are listed below and are for your entire account.  To read more about these rewards before making a selection, feel free to visit the uo.com site at <A HREF=\"http://www.uo.com/rewards\">http://www.uo.com/rewards</A>.", true, true);

      RewardSystem.ComputeRewardInfo(m_From, out int cur, out int max);

      AddHtmlLocalized(60, 105, 300, 35, 1006006); // Your current total of rewards to choose:
      AddLabel(370, 107, 50, (max - cur).ToString());

      AddHtmlLocalized(60, 140, 300, 35, 1006007); // You have already chosen:
      AddLabel(370, 142, 50, cur.ToString());

      RewardCategory[] categories = RewardSystem.Categories;

      int page = 2;

      for (int i = 0; i < categories.Length; ++i)
      {
        if (!RewardSystem.HasAccess(m_From, categories[i]))
        {
          page += 1;
          continue;
        }

        AddButton(100, 180 + i * 40, 4005, 4005, 0, GumpButtonType.Page, page);

        page += PagesPerCategory(categories[i]);

        if (categories[i].NameString != null)
          AddHtml(135, 180 + i * 40, 300, 20, categories[i].NameString);
        else
          AddHtmlLocalized(135, 180 + i * 40, 300, 20, categories[i].Name);
      }

      page = 2;

      for (int i = 0; i < categories.Length; ++i)
        RenderCategory(categories[i], i, ref page);
    }

    private int PagesPerCategory(RewardCategory category)
    {
      List<RewardEntry> entries = category.Entries;
      int i = 0;

      for (int j = 0; j < entries.Count; j++)
        if (RewardSystem.HasAccess(m_From, entries[j]))
          i++;

      return (int)Math.Ceiling(i / 24.0);
    }

    private int GetButtonID(int type, int index) => 2 + index * 20 + type;

    private void RenderCategory(RewardCategory category, int index, ref int page)
    {
      AddPage(page);

      List<RewardEntry> entries = category.Entries;

      int i = 0;

      for (int j = 0; j < entries.Count; ++j)
      {
        RewardEntry entry = entries[j];

        if (!RewardSystem.HasAccess(m_From, entry))
          continue;

        if (i == 24)
        {
          AddButton(305, 415, 0xFA5, 0xFA7, 0, GumpButtonType.Page, ++page);
          AddHtmlLocalized(340, 415, 200, 20, 1011066); // Next page

          AddPage(page);

          AddButton(270, 415, 0xFAE, 0xFB0, 0, GumpButtonType.Page, page - 1);
          AddHtmlLocalized(185, 415, 200, 20, 1011067); // Previous page

          i = 0;
        }

        AddButton(55 + i / 12 * 250, 80 + i % 12 * 25, 5540, 5541, GetButtonID(index, j));

        if (entry.NameString != null)
          AddHtml(80 + i / 12 * 250, 80 + i % 12 * 25, 250, 20, entry.NameString);
        else
          AddHtmlLocalized(80 + i / 12 * 250, 80 + i % 12 * 25, 250, 20, entry.Name);
        ++i;
      }

      page += 1;
    }

    public override void OnResponse(NetState sender, RelayInfo info)
    {
      int buttonID = info.ButtonID - 1;

      if (buttonID == 0)
      {
        RewardSystem.ComputeRewardInfo(m_From, out int cur, out int max);

        if (cur < max)
          m_From.SendGump(new RewardNoticeGump(m_From));
      }
      else
      {
        --buttonID;

        int type = buttonID % 20;
        int index = buttonID / 20;

        RewardCategory[] categories = RewardSystem.Categories;

        if (type >= 0 && type < categories.Length)
        {
          RewardCategory category = categories[type];

          if (index >= 0 && index < category.Entries.Count)
          {
            RewardEntry entry = category.Entries[index];

            if (!RewardSystem.HasAccess(m_From, entry))
              return;

            m_From.SendGump(new RewardConfirmGump(m_From, entry));
          }
        }
      }
    }
  }
}