using System;
using System.Collections.Generic;
using System.Linq;

namespace IdleMafiaBot
{

    sealed class Instance
    {
        public IntPtr Handle;
        public string Name;
        public Header Head;
        public DateTime LookedAt;

        public string Label { get { return Name ?? "Roblox (reading...)"; } }
    }

    static class Instances
    {

        public static List<Instance> Read(List<Instance> known, Settings s, string dir)
        {
            var list = new List<Instance>();
            var now = DateTime.UtcNow;
            foreach (var h in RobloxWindow.All())
            {
                var had = known == null ? null : known.FirstOrDefault(i => i.Handle == h);
                if (had != null && (had.Name != null || now - had.LookedAt < TimeSpan.FromSeconds(30))) { list.Add(had); continue; }
                var head = HeaderIn(h, s);
                list.Add(new Instance { Handle = h, Head = head, Name = head == null || !Accounts.Plausible(head.Name) ? null : Accounts.Known(dir, Accounts.Tidy(head.Name.Trim())), LookedAt = now });
            }
            return list;
        }

        internal static Instance Pick(List<Instance> open, string account, bool pickedClosed)
        {
            var named = open.Where(i => i.Name != null).ToList();
            return named.FirstOrDefault(i => Accounts.Same(i.Name, account)) ?? (pickedClosed ? named.FirstOrDefault() : null);
        }

        public static bool SameWindows(List<Instance> a, List<Instance> b)
        {
            if (a == null || b == null || a.Count != b.Count) return false;
            for (int i = 0; i < a.Count; i++)
                if (a[i].Handle != b[i].Handle || a[i].Name != b[i].Name) return false;
            return true;
        }

        internal static Header HeaderIn(IntPtr h, Settings s)
        {
            try
            {
                var g = new Game(msg => { }, () => false);
                g.Win.Pinned = h;
                if (!g.Win.Find() || g.Win.Minimized) return null;
                using (var f = g.Win.Capture())
                {
                    var v = g.ViewOf(f);
                    if (v.Problem != null) return null;
                    g.SeedMax(s.BarMax);
                    return g.ReadHeader(f, v);
                }
            }
            catch (Exception) { return null; }
        }
    }
}