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

using XRL.Core;
using XRL.Rules;
using XRL.World;

namespace AutoDropBedding
{
	public static class Helpers
	{
		public static void Log(string msg)
		{
			if (Config.DebugLogging)
				UnityEngine.Debug.Log("[AutoDropBedding] " + msg);
		}

		public static List<GameObject> GetBedsInInventory(GameObject who = null)
		{
			Helpers.Log("Checking for beds in inventory.");
			return who.Inventory.GetObjects(o => o.HasPart("Bed"));
		}

		public static Cell FindNearestCampfire(GameObject who = null)
		{
			foreach (var cell in who.CurrentCell.GetAdjacentCells())
			{
				if (cell.HasFirestarter())
				{
					Helpers.Log("Found campfire in cell " + cell.Pos2D.ToString());
					return cell;
				}
			}
			Helpers.Log("Couldn't find campfire???");
			return null;
		}

		public static bool HasBedroll(GameObject who = null)
		{
			if (who == null)
				who = XRLCore.Core?.Game?.Player?.Body;

			foreach (var _ in GetBedsInInventory(who))
				return true;
			return false;
		}

		public static Cell PickBedrollCell(Cell dropperCell, Cell campfireCell)
		{
			if (dropperCell == null)
				dropperCell = XRLCore.Core?.Game?.Player?.Body.CurrentCell;

			if (campfireCell == null)
				campfireCell = FindNearestCampfire(XRLCore.Core?.Game?.Player?.Body);

			Log("Picking cell for bed.");

			List<Cell> nearDropperCells = dropperCell.GetAdjacentCells();
			nearDropperCells.Add(dropperCell); // ensure bedroll isn't dropped in campfire if dropper is in same cell

			if (campfireCell == null)
			{
				Log("Couldn't find a campfire anywhere, falling back to player cell.");
				return dropperCell;
			}

			string nearbyMsg = "cells nearby: ";
			nearDropperCells.ForEach(cell => nearbyMsg += cell.Pos2D.ToString() + " ");
			Log(nearbyMsg);

			List<Cell> nearCampfireCells = campfireCell.GetAdjacentCells()
											  .Where(cell => cell.IsEmpty() &&
											  				 cell.IsVisible() &&
															!cell.HasFirestarter() &&
															!cell.HasAnyLiquid())
											  .ToList();

			string campMsg = "cells nearby campfire: ";
			nearCampfireCells.ForEach(cell => campMsg += cell.Pos2D.ToString() + " ");
			Log(campMsg);

			List<Cell> commonCells = nearDropperCells.Intersect(nearCampfireCells).ToList();

			string commonMsg = "common cells: ";
			commonCells.ForEach(cell => commonMsg += cell.Pos2D.ToString() + " ");
			Log(commonMsg);

			// return random cell adjacent to both campfire and bedroll dropper, or dropper cell if none
			int randy = Stat.GetSeededRandomGenerator(dropperCell.Pos2D.ToString()).Next(0, commonCells.Count);
			return commonCells.Count > 0 ? commonCells[randy] : dropperCell;
		}

		public static void PutDownBedroll(GameObject who = null, Cell campfireCell = null, bool first = false)
		{
			if (who == null)
				who = XRLCore.Core?.Game?.Player?.Body;

			if (campfireCell == null)
				campfireCell = FindNearestCampfire(who);

			if (HasBedroll(who))
			{
				Cell bedrollCell = PickBedrollCell(who.CurrentCell, campfireCell);

				GameObject bed;
				List<GameObject> beds = GetBedsInInventory(who);

				if (first || beds.Count == 1)
					bed = beds[0];
				else
					bed = XRL.UI.PickItem.ShowPicker(beds);

				// why isn't there Inventory.Drop() or something
				var newBed = bedrollCell.AddObject(bed);
				who.Inventory.RemoveObject(bed);

				Log("Putting " + newBed.ShortDisplayName + " into cell.");
				IComponent<GameObject>.XDidY(who, "set out", newBed.a + newBed.ShortDisplayName);
			}
		}
	}
}