package behavior

type GatherConfig struct {
	Skill            string         `yaml:"skill"`
	Tools            []string       `yaml:"tools"`
	NoToolSpeed      float64        `yaml:"no_tool_speed,omitempty"`
	Bait             string         `yaml:"bait"`
	Success          SuccessFormula `yaml:"success"`
	GatherMessage    string         `yaml:"gather_message"`
	DepletedMessage  string         `yaml:"depleted_message"`
	ExhaustedMessage string         `yaml:"exhausted_message"`
	FailMessage      string         `yaml:"fail_message"`
	Drops            []DropEntry    `yaml:"drops"`
	RespawnTimer     float64        `yaml:"respawn_timer"`
	RespawnBroadcast string         `yaml:"respawn_broadcast"`
	DepleteTimer     float64        `yaml:"deplete_timer"`
	NestChance       int            `yaml:"nest_chance"`
	BroadcastMessage string         `yaml:"broadcast_message"`
}

type SuccessFormula struct {
	Base     float64 `yaml:"base"`
	PerLevel float64 `yaml:"per_level"`
	Cap      float64 `yaml:"cap"`
}

type TalkConfig struct {
	Nodes map[string]TalkNode `yaml:"nodes"`
}

type TalkNode struct {
	Messages  []string     `yaml:"messages,omitempty"`
	Condition *Condition   `yaml:"condition,omitempty"`
	Options   []TalkOption `yaml:"options"`
	Action    *Step        `yaml:"action,omitempty"`
	Goto      string       `yaml:"goto,omitempty"`
}

type TalkOption struct {
	Text      string     `yaml:"text"`
	Goto      string     `yaml:"goto"`
	Condition *Condition `yaml:"condition"`
	Action    *Step      `yaml:"action,omitempty"`
}

// Step is the universal effect primitive — one struct shared across every
// effect executor in the game: talk nodes/options, on_use/on_look/on_kill/
// on_enter/on_exit/on_traverse triggers, and on_flag_change/on_global_flag_change
// triggers. A trigger's effects are expressed as an ordered list of Steps;
// spacing between steps is the Wait field (a pure {wait: N} step pauses the
// sequence for N ticks before the next step fires).
//
// Condition is evaluated per-step by the sequence scheduler; an inline caller
// (talk node, synchronous use/look/kill) fires a single step without the
// scheduler and ignores the per-step Condition (its gating is done at the
// parent Trigger level instead).
type Step struct {
	Condition       *Condition      `yaml:"condition,omitempty"`
	Wait            int             `yaml:"wait,omitempty"`
	Messages        []string        `yaml:"messages,omitempty"`
	Broadcast       string          `yaml:"broadcast,omitempty"`
	BroadcastGlobal string          `yaml:"broadcast_global,omitempty"`
	SpawnMob        *SpawnMobConfig `yaml:"spawn_mob,omitempty"`
	DespawnMob      string          `yaml:"despawn_mob,omitempty"`
	SetGlobalFlags  map[string]any  `yaml:"set_global_flags,omitempty"`
	SetPlayerFlags  map[string]any  `yaml:"set_player_flags,omitempty"`
	GiveItem        string          `yaml:"give_item,omitempty"`
	TakeItem        string          `yaml:"take_item,omitempty"`
	Teleport        int             `yaml:"teleport,omitempty"`
	Heal            int             `yaml:"heal,omitempty"`
	Credits         int             `yaml:"credits,omitempty"`
	ApsNode         bool            `yaml:"aps_node,omitempty"`
}

// HasEffects reports whether the step carries any effect beyond a pure wait.
func (s Step) HasEffects() bool {
	return len(s.Messages) > 0 || s.Broadcast != "" || s.BroadcastGlobal != "" ||
		s.SpawnMob != nil || s.DespawnMob != "" ||
		len(s.SetGlobalFlags) > 0 || len(s.SetPlayerFlags) > 0 ||
		s.GiveItem != "" || s.TakeItem != "" || s.Teleport != 0 || s.Heal != 0 ||
		s.Credits != 0 || s.ApsNode
}

// Trigger is the one conditional wrapper used by every event block in the
// game: on_use, on_look, on_kill, on_enter, on_exit, on_traverse,
// on_flag_change, and on_global_flag_change. Entries in a block are walked
// top-to-bottom; the first whose ItemID filter and Condition pass wins and
// its Steps run as a scripted sequence.
//
// For verb blocks only ItemID/Condition/Steps/Lock are meaningful. For
// on_flag_change/on_global_flag_change blocks, OnPlayerFlag/OnGlobalFlag (and
// optional Value) declare the flag subscription; Condition provides an
// additional gate (use the Room condition to scope a flag trigger to a room).
//
// Lock, when true, makes the sequence atomic: the player is blocked from any
// verb (except quit) until it completes, and the sequence is saved and resumed
// across disconnect. Unlocked sequences (the default) are interruptable by any
// verb and are not persisted.
type Trigger struct {
	Lock         bool       `yaml:"lock,omitempty"`
	ItemID       string     `yaml:"item_id,omitempty"`
	Condition    *Condition `yaml:"condition,omitempty"`
	Steps        []Step     `yaml:"steps"`
	OnPlayerFlag string     `yaml:"on_player_flag,omitempty"`
	OnGlobalFlag string     `yaml:"on_global_flag,omitempty"`
	Value        any        `yaml:"value,omitempty"`
	DedupKey     string     `yaml:"-"` // runtime only — disambiguates flag-trigger dedup keys
}

// SpawnMobConfig configures a transient mob spawned by a trigger step. The
// mob id is required; other fields are optional.
type SpawnMobConfig struct {
	ID             string  `yaml:"id"`
	OwnerOnly      bool    `yaml:"owner_only"`
	DespawnOnLeave bool    `yaml:"despawn_on_leave"`
	DespawnRooms   []int   `yaml:"despawn_rooms"`
	DespawnTicks   float64 `yaml:"despawn_ticks"`
}

// ShopConfig is a root-level mob property (mob YAML `shop:`). Buy prices are
// always 100% of the item's value; sell prices follow the OSRS store formula:
//
//	sell = value * max(10, buy_percentage - stock*change_percentage) / 100
//
// where stock is the shop's current holding of that item. BuyPercentage
// defaults to 40 and ChangePercentage to 3 when unset (see ShopBuyPercentage /
// ShopChangePercentage).
type ShopConfig struct {
	Message          string     `yaml:"message"`
	BuyPercentage    float64    `yaml:"buy_percentage"`    // sell price at zero stock, % of value (default 40)
	ChangePercentage float64    `yaml:"change_percentage"` // sell price drop per unit of stock, % of value (default 3)
	BuysAnything     *bool      `yaml:"buys_anything"`     // buy items not in the list (default true)
	Items            []ShopItem `yaml:"items"`
}

type ShopItem struct {
	ItemID       string  `yaml:"item_id"`
	Stock        int     `yaml:"stock"`         // target/max stock; also starting stock
	RestockTicks float64 `yaml:"restock_ticks"` // per-item restock interval (overrides shop default)
}

// Shop pricing defaults, applied when the YAML leaves a field at zero.
const (
	ShopBuyPercentage    = 40.0
	ShopChangePercentage = 3.0
	ShopMinSellPercent   = 10.0
)

// ShopDefaultRestock is the fallback restock interval (in ticks) for a shop item
// that does not set its own restock_ticks. It is configurable via
// game_constants.shop_default_restock in config.yaml (wired up at startup); the
// value here is only the default used when no config is loaded.
var ShopDefaultRestock = 1000.0

// EffectiveBuyPercentage returns BuyPercentage or the default.
func (c *ShopConfig) EffectiveBuyPercentage() float64 {
	if c.BuyPercentage > 0 {
		return c.BuyPercentage
	}
	return ShopBuyPercentage
}

// EffectiveChangePercentage returns ChangePercentage or the default.
func (c *ShopConfig) EffectiveChangePercentage() float64 {
	if c.ChangePercentage > 0 {
		return c.ChangePercentage
	}
	return ShopChangePercentage
}

// Buys reports whether the shop will buy items not in its item list.
func (c *ShopConfig) Buys() bool {
	return c.BuysAnything == nil || *c.BuysAnything
}

// SellPrice computes the per-unit price the shop pays for an item of the given
// value when the shop currently holds `stock` of it.
func (c *ShopConfig) SellPrice(value, stock int) int {
	if stock < 0 {
		stock = 0
	}
	pct := c.EffectiveBuyPercentage() - float64(stock)*c.EffectiveChangePercentage()
	if pct < ShopMinSellPercent {
		pct = ShopMinSellPercent
	}
	return int(float64(value) * pct / 100.0)
}

// RestockInterval returns the effective restock interval (in ticks) for an item,
// honoring the per-item override, then the configurable global default.
func (c *ShopConfig) RestockInterval(item *ShopItem) int {
	if item != nil && item.RestockTicks > 0 {
		return int(item.RestockTicks)
	}
	return int(ShopDefaultRestock)
}

// FindItem returns the configured shop item with the given id, or nil.
func (c *ShopConfig) FindItem(itemID string) *ShopItem {
	for i := range c.Items {
		if c.Items[i].ItemID == itemID {
			return &c.Items[i]
		}
	}
	return nil
}

// Condition is the single predicate struct used everywhere a gate is needed:
// exits, descriptions, talk nodes/options, trigger entries, and per-step
// conditions. The atomic predicates combine via AllOf/AnyOf nesting and the
// Not inverter. Room matches when the triggering player is currently in that
// room (ignored for global-flag triggers with no player).
type Condition struct {
	GlobalFlag string      `yaml:"global_flag,omitempty"`
	PlayerFlag string      `yaml:"player_flag,omitempty"`
	Room       int         `yaml:"room,omitempty"`
	Value      any         `yaml:"value,omitempty"`
	Not        bool        `yaml:"not,omitempty"`
	HasItem    string      `yaml:"has_item,omitempty"`
	MinCredits int         `yaml:"min_credits,omitempty"`
	AllOf      []Condition `yaml:"all_of,omitempty"`
	AnyOf      []Condition `yaml:"any_of,omitempty"`
}