private static GridCell[,] ParseGrid(IEnumerable <string> lines)
{
int y = 0;
var allLines = lines.ToList();
int width = allLines[0].Length;
var grid = new GridCell[allLines.Count, width];
int nextGoblinId = 0;
int nextElfId = 0;
foreach (string line in lines.Where(s => !string.IsNullOrWhiteSpace(s)))
{
if (line.Length != width)
{
throw new ArgumentException("All lines must be same length");
}
int x = 0;
foreach (char c in line)
{
GridCell cell;
switch (c)
{
case '#':
cell = GridCell.Wall();
break;
case '.':
cell = GridCell.Empty();
break;
case 'G':
cell = GridCell.Goblin(nextGoblinId++);
break;
case 'E':
cell = GridCell.Elf(nextElfId++);
break;
default:
throw new ArgumentException("Unknown map cell type: " + c);
}
grid[y, x++] = cell;
}
y += 1;
}
return(grid);
}
public (GameState state, bool combatEnds) PlayRound()
{
bool combatEnds = false;
var coordinates = new List <(int x, int y)>();
int height = Grid.GetLength(0);
int width = Grid.GetLength(1);
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
GridCell cell = Grid[y, x];
if (cell.IsElf || cell.IsGoblin)
{
coordinates.Add((x, y));
}
}
}
var elfHitPoints = ElfHitPoints;
var goblinHitPoints = GoblinHitPoints;
GridCell[,] grid = Grid;
for (int i = 0; i < coordinates.Count; ++i)
{
var xy = coordinates[i];
GridCell unitCell = grid[xy.y, xy.x];
if (!(unitCell.IsElf || unitCell.IsGoblin))
{
// Already taken out in an earlier turn this round.
continue;
}
if ((unitCell.IsElf && !goblinHitPoints.Any(kv => kv.Value > 0)) ||
(unitCell.IsGoblin && !elfHitPoints.Any(kv => kv.Value > 0)))
{
combatEnds = true;
break;
}
int hitPower = unitCell.IsElf
? elfHitPoints[unitCell.ElfId.Value]
: goblinHitPoints[unitCell.GoblinId.Value];
// Move if appropriate.
var move = GridOperations.CalculateMove(grid, xy.x, xy.y);
if (move.HasValue)
{
bool isElf = unitCell.IsElf;
int unitId = isElf ? unitCell.ElfId.Value : unitCell.GoblinId.Value;
RemoveItem(height, width, grid, xy);
var newCoordinates = (x : xy.x + move.Value.dx, y : xy.y + move.Value.dy);
grid[newCoordinates.y, newCoordinates.x] = isElf
? GridCell.Elf(unitId)
: GridCell.Goblin(unitId);
GridOperations.CalculateCloseness(_gridPair);
coordinates[i] = newCoordinates;
}
// Attack if appropriate.
xy = coordinates[i];
var match = GridOperations.FindBest(
grid,
xy.x,
xy.y,
c =>
{
bool isTarget = unitCell.IsElf ? c.IsGoblin : c.IsElf;
return(isTarget
? NullIfDead(unitCell.IsElf ? goblinHitPoints[c.GoblinId.Value] : elfHitPoints[c.ElfId.Value])
: default);
int?NullIfDead(int v) => v > 0 ? v : default;
},