using System;
using System.Collections.Generic;

namespace NHSE.Core;

public sealed record LayerFieldItem(Item[] Tiles, byte AcreWidth, byte AcreHeight)
    : LayerItem(Tiles, GetViewport(AcreWidth, AcreHeight))
{
    private static TileGridViewport GetViewport(byte width, byte height) => new(TilesPerAcreDim, TilesPerAcreDim, width, height);

    public const int TilesPerAcreDim = 32;

    public int ClearFieldPlanted(Func<FieldItemKind, bool> criteria) => ClearFieldPlanted(0, 0, TileInfo.TotalWidth, TileInfo.TotalHeight, criteria);
    public int RemoveAll(Func<Item, bool> criteria) => RemoveAll(0, 0, TileInfo.TotalWidth, TileInfo.TotalHeight, criteria);
    public int RemoveAll(HashSet<ushort> items) => RemoveAll(0, 0, TileInfo.TotalWidth, TileInfo.TotalHeight, z => items.Contains(z.DisplayItemId));
    public int RemoveAll(ushort item) => RemoveAll(0, 0, TileInfo.TotalWidth, TileInfo.TotalHeight, z => z.DisplayItemId == item);

    public int ClearFieldPlanted(int xmin, int ymin, int width, int height, Func<FieldItemKind, bool> criteria)
    {
        int count = 0;
        var fi = FieldItemList.Items;

        for (int x = xmin; x < xmin + width; x++)
        {
            for (int y = ymin; y < ymin + height; y++)
            {
                if (!Contains(x, y))
                    continue;

                var t = GetTile(x, y);
                var disp = t.DisplayItemId;
                if (!fi.TryGetValue(disp, out var val))
                    continue;

                if (!criteria(val.Kind))
                    continue;
                t.Delete();
                count++;
            }
        }
        return count;
    }

    public int ModifyAll(int xmin, int ymin, int width, int height, Func<Item, bool> criteria, Action<Item> action)
    {
        int count = 0;
        for (int x = xmin; x < xmin + width; x++)
        {
            for (int y = ymin; y < ymin + height; y++)
            {
                if (!Contains(x, y))
                    continue;
                var t = GetTile(x, y);
                if (!criteria(t))
                    continue;
                action(t);
                count++;
            }
        }
        return count;
    }

    public int RemoveAllHoles(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, z => z == FieldItemKind.UnitIconHole);
    public int RemoveAllWeeds(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, z => z.IsWeed);
    public int RemoveAllTrees(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, z => z.IsTree);
    public int RemoveAllPlants(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, z => z.IsPlant);
    public int RemoveAllFences(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, z => z.IsFence);
    public int RemoveAllFlowers(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, z => z.IsFlower);
    public int RemoveAllBushes(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, z => z.IsBush);
    public int RemoveAllObjects(int xmin, int ymin, int width, int height) => ClearFieldPlanted(xmin, ymin, width, height, _ => true);

    public int RemoveAll(int xmin, int ymin, int width, int height) => RemoveAll(xmin, ymin, width, height, _ => true);
    public int RemoveAllShells(int xmin, int ymin, int width, int height) => RemoveAll(xmin, ymin, width, height, z => GameLists.Shells.Contains(z.DisplayItemId));
    public int RemoveAllBranches(int xmin, int ymin, int width, int height) => RemoveAll(xmin, ymin, width, height, z => z.DisplayItemId == 2500);
    public int RemoveAllPlacedItems(int xmin, int ymin, int width, int height) => RemoveAll(xmin, ymin, width, height, z => !z.IsNone && !FieldItemList.Items.ContainsKey(z.DisplayItemId));
    public int RemoveAllLike(int xmin, int ymin, int width, int height, Item item) => RemoveAll(xmin, ymin, width, height, z => !z.IsNone && item.DisplayItemId == z.DisplayItemId);

    public int WaterAllFlowers(int xmin, int ymin, int width, int height, bool all)
    {
        var fi = FieldItemList.Items;

        bool IsFlowerWaterable(Item item)
        {
            if (item.IsNone)
                return false;
            if (!item.IsRoot)
                return false;
            if (!fi.TryGetValue(item.ItemId, out var def))
                return false;
            if (!def.Kind.IsFlower)
                return false;
            return true;
        }

        return ModifyAll(xmin, ymin, width, height, IsFlowerWaterable, z => z.Water(all));
    }

    public Item this[int relX, int relY]
    {
        get => GetTile(relX, relY);
        set => SetTile(relX, relY, value);
    }
}