using Theriapolis.Core.Rules.Combat;

namespace Theriapolis.Core.Entities.Ai;

/// <summary>
/// "Move toward target, attack when in reach" — the baseline aggressive
/// melee behavior. Used by Brigand* and Patrol templates that aren't
/// scripted to flee.
/// </summary>
public sealed class BrigandBehavior : INpcBehavior
{
    public void TakeTurn(Combatant self, AiContext ctx)
    {
        if (self.IsDown) return;
        var target = ctx.FindClosestHostile(self);
        if (target is null) return;
        var attack = self.AttackOptions[0];

        // Move budget: 5 ft. = 1 tactical tile per d20 standard.
        int tiles = ctx.Encounter.CurrentTurn.RemainingMovementFt / 5;
        while (!ReachAndCover.IsInReach(self, target, attack) && tiles > 0)
        {
            var next = ReachAndCover.StepToward(self.Position, target.Position);
            if (next.X == self.Position.X && next.Y == self.Position.Y) break;
            self.Position = next;
            ctx.Encounter.AppendLog(CombatLogEntry.Kind.Move,
                $"{self.Name} moves to ({(int)next.X},{(int)next.Y}).");
            tiles--;
        }
        int consumedTiles = (ctx.Encounter.CurrentTurn.RemainingMovementFt / 5) - tiles;
        ctx.Encounter.CurrentTurn.ConsumeMovement(consumedTiles * 5);

        if (!ReachAndCover.IsInReach(self, target, attack)) return;
        Resolver.AttemptAttack(ctx.Encounter, self, target, attack);
        ctx.Encounter.CurrentTurn.ConsumeAction();
    }
}