using System.Globalization;
using System.IO;
using System.Text;
using Godot;

namespace WorldSim;

/// <summary>
/// Daily stats to CSV (SPEC §11 behavioral validation).
/// One row per simulated day — the soak test's flight recorder.
/// Written to the project folder as soak_stats.csv, fresh each run.
/// </summary>
public static class StatsLogger
{
    private static string _path = "";
    private static string _npcPath = "";

    private const string Header =
        "day,season,wood,stone,clay,food," +
        "harvested,trades," +
        "avg_fatigue,avg_nourish,avg_health,carried," +
        "gather_ticks,build_ticks,trade_ticks,rest_ticks,social_ticks," +
        "shelters_done,ruins,avg_cond,upkeep_stock,burn_per_day,modules,granary_food";

    private const string NpcHeader =
        "day,npc,name,soul,dominant,gather_ticks,build_ticks,trade_ticks,rest_ticks,social_ticks";

    private const string GiftHeader =
        "day,giver,giver_soul,receiver,receiver_soul,material,amount";

    private static string _giftPath = "";

    public static void Init()
    {
        string dir = ProjectSettings.GlobalizePath("res://");
        _path     = Path.Combine(dir, "soak_stats.csv");
        _npcPath  = Path.Combine(dir, "soak_npc_days.csv");
        _giftPath = Path.Combine(dir, "soak_gifts.csv");
        File.WriteAllText(_path, Header + "\n");
        File.WriteAllText(_npcPath, NpcHeader + "\n");
        File.WriteAllText(_giftPath, GiftHeader + "\n");
        GD.Print($"[Stats] Logging to {_path}, {_npcPath}, {_giftPath}");
    }

    /// <summary>Every gift, with names — so we can see who carries the town.</summary>
    public static void LogGift(Npc giver, Npc receiver, MaterialKind material, float amount)
    {
        if (string.IsNullOrEmpty(_giftPath)) return;
        int day = GameManager.Instance?.Day ?? -1;
        File.AppendAllText(_giftPath,
            $"{day},{giver.Name},{giver.Soul.Type},{receiver.Name},{receiver.Soul.Type}," +
            $"{material},{amount.ToString("0.0", CultureInfo.InvariantCulture)}\n");
    }

    public static void LogDay(GameManager gm)
    {
        var ci = CultureInfo.InvariantCulture;

        // World resource totals
        float wood = 0f, stone = 0f, clay = 0f, food = 0f;
        foreach (var n in gm.World.Nodes)
        {
            switch (n.Kind)
            {
                case MaterialKind.Wood:  wood  += n.Amount; break;
                case MaterialKind.Stone: stone += n.Amount; break;
                case MaterialKind.Clay:  clay  += n.Amount; break;
                case MaterialKind.Food:  food  += n.Amount; break;
            }
        }

        // Villagers — state time from full-day tick counts, not a midnight
        // snapshot (the night rule made snapshots useless).
        float fatigue = 0f, nourish = 0f, health = 0f, carried = 0f;
        int gathering = 0, building = 0, trading = 0, resting = 0, socializing = 0;
        foreach (var npc in gm.Npcs)
        {
            fatigue += npc.Fatigue;
            nourish += npc.Nourishment;
            health  += npc.Health;
            carried += npc.TotalCarried();
            gathering   += npc.StateTicksToday[(int)NpcState.Gathering];
            building    += npc.StateTicksToday[(int)NpcState.Building];
            trading     += npc.StateTicksToday[(int)NpcState.Trading];
            resting     += npc.StateTicksToday[(int)NpcState.Resting];
            socializing += npc.StateTicksToday[(int)NpcState.Socializing];
        }
        int count = Mathf.Max(1, gm.Npcs.Count);

        // Buildings
        int done = 0, ruins = 0, modules = 0;
        float cond = 0f, stock = 0f, burn = 0f, granaryFood = 0f;
        foreach (var b in gm.Buildings)
        {
            if (b.IsRuined) { ruins++; continue; }
            if (!b.IsComplete) continue;
            if (b.Kind == BuildingKind.Granary) { granaryFood += b.FoodStock; continue; }
            done++;
            cond    += b.Condition;
            stock   += b.UpkeepStock;
            burn    += b.DailyBurn;
            modules += b.Modules;
        }
        float avgCond = done > 0 ? cond / done : 0f;

        var row = new StringBuilder();
        row.Append(gm.Day).Append(',');
        row.Append(gm.SeasonName).Append(',');
        row.Append(wood.ToString("0.0", ci)).Append(',');
        row.Append(stone.ToString("0.0", ci)).Append(',');
        row.Append(clay.ToString("0.0", ci)).Append(',');
        row.Append(food.ToString("0.0", ci)).Append(',');
        row.Append(gm.World.HarvestedToday.ToString("0.0", ci)).Append(',');
        row.Append(TradeSystem.TradesToday).Append(',');
        row.Append((fatigue / count).ToString("0.0", ci)).Append(',');
        row.Append((nourish / count).ToString("0.000", ci)).Append(',');
        row.Append((health / count).ToString("0.0", ci)).Append(',');
        row.Append(carried.ToString("0.0", ci)).Append(',');
        row.Append(gathering).Append(',').Append(building).Append(',')
           .Append(trading).Append(',').Append(resting).Append(',').Append(socializing).Append(',');
        row.Append(done).Append(',').Append(ruins).Append(',');
        row.Append(avgCond.ToString("0.000", ci)).Append(',');
        row.Append(stock.ToString("0.0", ci)).Append(',');
        row.Append(burn.ToString("0.0", ci)).Append(',');
        row.Append(modules).Append(',');
        row.Append(granaryFood.ToString("0.0", ci));

        File.AppendAllText(_path, row + "\n");

        // Per-villager day rows: what each person mostly did — the raw
        // material of emergent roles ("the role follows from the life").
        var npcRows = new StringBuilder();
        for (int i = 0; i < gm.Npcs.Count; i++)
        {
            var npc = gm.Npcs[i];
            var t = npc.StateTicksToday;
            npcRows.Append(gm.Day).Append(',')
                   .Append(i + 1).Append(',')
                   .Append(npc.Name).Append(',')
                   .Append(npc.Soul.Type).Append(',')
                   .Append(npc.DominantStateToday()).Append(',')
                   .Append(t[(int)NpcState.Gathering]).Append(',')
                   .Append(t[(int)NpcState.Building]).Append(',')
                   .Append(t[(int)NpcState.Trading]).Append(',')
                   .Append(t[(int)NpcState.Resting]).Append(',')
                   .Append(t[(int)NpcState.Socializing]).Append('\n');
            System.Array.Clear(npc.StateTicksToday, 0, npc.StateTicksToday.Length);
        }
        File.AppendAllText(_npcPath, npcRows.ToString());

        // Reset per-day counters
        gm.World.HarvestedToday = 0f;
        TradeSystem.TradesToday = 0;
    }
}