package behavior

import "gopkg.in/yaml.v3"

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    *NodeAction  `yaml:"action"`
	Goto      string       `yaml:"goto,omitempty"`
}

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

// NodeAction is the inline-only effects payload — used by talk nodes,
// talk options, and any callers that need a simple "do these effects now"
// primitive (use/look/kill interactions, exits). It is the embedded
// subset of StepAction (the universal superset used by on_enter and triggers).
type NodeAction struct {
	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"`
}

// Interaction is one conditional trigger entry shared by on_use, on_look
// (objects) and on_kill (mobs). Item filters by the appropriate held/weapon
// item depending on the interaction kind (see itemMatch on applyInteraction).
// The first entry whose item filter and Condition pass wins and fires exactly
// once.
//
// Action is a full StepAction so on_kill may broadcast a kill announcement or
// spawn a follow-up mob; inline callers (use/look) simply leave the
// sequence-only fields empty.
type Interaction struct {
	Item      string      `yaml:"item_id,omitempty"`
	Condition *Condition  `yaml:"condition,omitempty"`
	Message   string      `yaml:"message,omitempty"`
	Action    *StepAction `yaml:"action,omitempty"`
}

// StepAction is the universal effect primitive — one superset struct shared
// across all effect executors (on_enter steps, room/global triggers, talk
// nodes, use/look/kill interactions, exit traversal). The embedded
// NodeAction holds the inline-only effects (flags/items/teleport/heal/credits/
// aps_node); the additional fields are the sequence-only effects (message,
// broadcasts, mob spawn/despawn, delay). Condition is evaluated per-step by
// the on_enter / trigger schedulers; inline callers ignore it (the gating
// happens at the parent Interaction.ExitDef level instead).
type StepAction struct {
	NodeAction      `yaml:",inline"`
	Condition       *Condition      `yaml:"condition,omitempty"`
	Message         string          `yaml:"message,omitempty"`
	Broadcast       string          `yaml:"broadcast,omitempty"`
	BroadcastGlobal string          `yaml:"broadcast_global,omitempty"`
	SpawnMob        *SpawnMobConfig `yaml:"spawn_mob,omitempty"`
	DespawnMob      string          `yaml:"despawn_mob,omitempty"`
	Delay           int             `yaml:"delay,omitempty"`
}

// IsTimed reports whether the step carries sequence semantics (any non-zero
// field means it needs per-tick scheduling rather than synchronous printing).
func (s StepAction) IsTimed() bool {
	return s.Delay > 0 || s.Message != "" || 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
}

// SpawnMobConfig configures a transient mob spawned by a trigger or on_enter
// step. It accepts either a bare string (the mob id) or a full map at
// unmarshal time.
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"`
}

func (s *SpawnMobConfig) UnmarshalYAML(value *yaml.Node) error {
	if value.Kind == yaml.ScalarNode {
		var id string
		if err := value.Decode(&id); err != nil {
			return err
		}
		s.ID = id
		return nil
	}
	type raw SpawnMobConfig
	return value.Decode((*raw)(s))
}

// 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
}

type Condition struct {
	GlobalFlag string      `yaml:"global_flag"`
	Value      any         `yaml:"value"`
	Not        bool        `yaml:"not"`
	PlayerFlag string      `yaml:"player_flag"`
	HasItem    string      `yaml:"has_item"`
	MinCredits int         `yaml:"min_credits"`
	AllOf      []Condition `yaml:"all_of"`
	AnyOf      []Condition `yaml:"any_of"`
}