package game

import (
	"fmt"
	"math/rand"
	"sort"

	"thehouseoficarus/internal/net"
	"thehouseoficarus/internal/player"
)

func (g *Game) dropItemsOnDeath(p *player.Player) {
	roomID := p.RoomID

	if p.Credits > 0 {
		g.World.AddGroundItem(roomID, "credits", p.Credits)
		p.Credits = 0
	}

	var items []deathDrop

	for slot, inv := range p.Inventory {
		if inv == nil || inv.Quantity <= 0 {
			continue
		}
		val := 0
		if def, err := g.ItemStore.Load(inv.ItemID); err == nil {
			val = def.Value * inv.Quantity
		}
		items = append(items, deathDrop{
			itemID:     inv.ItemID,
			quantity:   inv.Quantity,
			totalValue: val,
			invSlot:    slot,
		})
	}

	for eqSlot, itemID := range p.Equipment {
		val := 0
		if def, err := g.ItemStore.Load(itemID); err == nil {
			val = def.Value
		}
		items = append(items, deathDrop{
			itemID:     itemID,
			quantity:   1,
			totalValue: val,
			isEquip:    true,
			equipSlot:  eqSlot,
		})
	}

	if len(items) <= 3 {
		return
	}

	sort.Slice(items, func(i, j int) bool {
		return items[i].totalValue > items[j].totalValue
	})

	for i := 3; i < len(items); i++ {
		it := items[i]
		if it.isEquip {
			delete(p.Equipment, it.equipSlot)
		} else {
			p.SetInvSlot(it.invSlot, nil)
		}
		g.World.AddGroundItem(roomID, it.itemID, it.quantity)
	}
}

// aggroChancePerTick is the probability per engine tick that an aggressive mob
// in the player's room initiates combat against them. The first roll happens
// inline on arrival (so a player who enters and immediately moves again — the
// 1-tick single-move case — still risks being caught ~33% of the time); if the
// initial roll fails, a per-tick retry subscriber keeps rolling for any
// subsequent tick the player lingers in the room.
const aggroChancePerTick = 0.33

func (g *Game) checkAggro(sess *net.Session) {
	p := sess.Player

	if p.GodMode {
		return
	}

	if g.Combat.Get(p.Name) != nil {
		return
	}

	playerLevel := p.CombatLevel()
	mobs := g.MobStore.MobsInRoom(p.RoomID)

	for _, mob := range mobs {
		if !mob.Aggressive || mob.HP <= 0 || mob.Protected {
			continue
		}
		if g.Combat.IsMobInCombat(mob.InstanceID) {
			continue
		}
		mobLevel := mobCombatLevel(mob)
		if playerLevel > mobLevel*2 {
			continue
		}
		if g.isSafespotted(p.Name) && g.safespotBlocksMob(p, mob) {
			continue
		}
		aggMob := mob

		// rollAggro attempts to start combat this instant. It returns true
		// when aggro should stop retrying that mob for this player — either
		// because it succeeded, because the mob/player is no longer eligible,
		// or because the roll failed and the caller subscribed a per-tick
		// retry. The retry subscriber returns the negation of the inline
		// call's "stop" so it stays subscribed only while the player is
		// still a valid target the roll hasn't yet hit.
		rollAggro := func() (stop bool) {
			if g.Combat.Get(p.Name) != nil {
				return true
			}
			if aggMob.HP <= 0 || aggMob.RoomID != p.RoomID {
				return true
			}
			if g.Combat.IsMobInCombat(aggMob.InstanceID) {
				return true
			}
			if rand.Float64() >= aggroChancePerTick {
				return false
			}
			attacker := aggMob.Name
			if !aggMob.Unique {
				attacker = "The " + aggMob.Name
			}
			sess.WriteLine(fmt.Sprintf("%s attacks you!", g.colorize(sess, "mob", attacker)))
			g.startCombat(sess, p, aggMob)
			return true
		}

		if rollAggro() {
			break
		}
		g.Ticks.Subscribe(1, func() bool { return !rollAggro() })
		break
	}
}