package world

import (
	"gopkg.in/yaml.v3"
	"thehouseoficarus/internal/action"
)

type ExitDir string

const (
	North ExitDir = "north"
	South ExitDir = "south"
	East  ExitDir = "east"
	West  ExitDir = "west"
	Up    ExitDir = "up"
	Down  ExitDir = "down"
)

var ExitAliases = map[string]ExitDir{
	"n":  North,
	"s":  South,
	"e":  East,
	"w":  West,
	"u":  Up,
	"d":  Down,
}

var OppositeExit = map[ExitDir]ExitDir{
	North: South,
	South: North,
	East:  West,
	West:  East,
	Up:    Down,
	Down:  Up,
}

var ExitOrder = []ExitDir{
	North, South, East, West, Up, Down,
}

type SpawnDef struct {
	ID           string  `yaml:"id"`
	Quantity     int     `yaml:"quantity"`
	RespawnTicks float64 `yaml:"respawn_ticks"`
}

type ExitDef struct {
	Room           int               `yaml:"room"`
	Condition      *action.Condition `yaml:"condition"`
	BlockedMessage string            `yaml:"blocked_message"`
	SetFlags       map[string]any    `yaml:"set_flags"`
	SetPlayerFlags map[string]any    `yaml:"set_player_flags"`
}

func (e *ExitDef) UnmarshalYAML(value *yaml.Node) error {
	if value.Kind == yaml.ScalarNode {
		var n int
		if err := value.Decode(&n); err != nil {
			return err
		}
		e.Room = n
		return nil
	}
	type raw ExitDef
	return value.Decode((*raw)(e))
}

type Room struct {
	ID          int                 `yaml:"id"`
	Name        string              `yaml:"name"`
	Description string              `yaml:"description"`
	Descriptions []RoomDesc         `yaml:"descriptions,omitempty"`
	Exits       map[ExitDir]ExitDef `yaml:"exits"`
	Objects     []RoomObject        `yaml:"objects"`
	ItemSpawns   []SpawnDef          `yaml:"item_spawns"`
	Mobs        []RoomMob           `yaml:"mobs"`
	OnEnter     []EnterStep         `yaml:"on_enter"`
	Hazard      string              `yaml:"hazard"`
}

type RoomDesc struct {
	Text      string            `yaml:"text"`
	Condition *action.Condition `yaml:"condition"`
}

type RoomMob struct {
	ID             string `yaml:"id"`
	WanderRooms    []int  `yaml:"wander_rooms"`
	WanderInterval float64 `yaml:"wander_interval"`
}

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

type EnterStep struct {
	Message        string            `yaml:"message"`
	Condition      *action.Condition `yaml:"condition"`
	Delay          int               `yaml:"delay"`
	SetFlags       map[string]any    `yaml:"set_flags"`
	SetPlayerFlags map[string]any    `yaml:"set_player_flags"`
}

// IsTimed reports whether the step carries cutscene semantics: a tick delay or
// a flag mutation. A room whose qualifying on_enter steps are all non-timed is
// printed synchronously; any timed step turns the sequence into a scheduled
// cutscene.
func (e EnterStep) IsTimed() bool {
	return e.Delay > 0 || len(e.SetFlags) > 0 || len(e.SetPlayerFlags) > 0
}

type RoomObject struct {
	ID             string `yaml:"id"`
	WanderRooms    []int  `yaml:"wander_rooms"`
	WanderInterval float64 `yaml:"wander_interval"`
}