export enum TileType {
  DEEP_WATER    = 0,
  SHALLOW_WATER = 1,
  SAND          = 2,
  GRASS         = 3,
  DARK_GRASS    = 4,
  FOREST        = 5,
  ROCK          = 6,
  FLOOR         = 7,
  WALL          = 8,
  TILLED_SOIL   = 9,
  WATERED_SOIL  = 10,
}

export const IMPASSABLE = new Set<number>([
  TileType.DEEP_WATER,
  TileType.SHALLOW_WATER,
  TileType.FOREST,
  TileType.ROCK,
  TileType.WALL,
])

/** Tiles on which tree seedlings may be planted. */
export const PLANTABLE_TILES = new Set<TileType>([TileType.GRASS, TileType.DARK_GRASS])

export type ItemId = 'wood' | 'stone' | 'wheat_seed' | 'carrot_seed' | 'wheat' | 'carrot' | 'tree_seed'

export type BuildingType = 'floor' | 'wall' | 'chest' | 'bed' | 'stockpile_zone'

export type CropKind = 'wheat' | 'carrot'

export type JobType = 'chop' | 'mine' | 'farm'

export type AIState = 'idle' | 'walking' | 'working' | 'sleeping'

export interface JobPriorities {
  chop: number   // 0 = disabled, 1 = highest, 4 = lowest
  mine: number
  farm: number
}

export interface VillagerJob {
  type: JobType
  targetId: string
  tileX: number
  tileY: number
  carrying: Partial<Record<ItemId, number>>
}

export interface VillagerState {
  id: string
  name: string
  x: number
  y: number
  bedId: string | null
  job: VillagerJob | null
  priorities: JobPriorities
  energy: number
  aiState: AIState
}

export interface ResourceNodeState {
  id: string
  tileX: number
  tileY: number
  kind: 'tree' | 'rock'
  hp: number
}

export interface BuildingState {
  id: string
  tileX: number
  tileY: number
  kind: BuildingType
  ownerId: string
}

export interface CropState {
  id: string
  tileX: number
  tileY: number
  kind: CropKind
  stage: number
  maxStage: number
  stageTimerMs: number
  watered: boolean
}

export interface PlayerState {
  id: string
  x: number
  y: number
  inventory: Partial<Record<ItemId, number>>
}

export interface TreeSeedlingState {
  id: string
  tileX: number
  tileY: number
  /** Growth stage: 0 = sprout, 1 = sapling, 2 = mature (converts to resource). */
  stage: number
  /** Time remaining until next stage advance, in milliseconds. */
  stageTimerMs: number
  /** The tile type that was under the seedling when planted (GRASS or DARK_GRASS). */
  underlyingTile: TileType
}

export interface WorldState {
  seed: number
  tiles: number[]
  resources: Record<string, ResourceNodeState>
  buildings: Record<string, BuildingState>
  crops: Record<string, CropState>
  villagers: Record<string, VillagerState>
  stockpile: Partial<Record<ItemId, number>>
  /** Planted tree seedlings, keyed by ID. */
  treeSeedlings: Record<string, TreeSeedlingState>
  /**
   * Recovery timers for DARK_GRASS tiles, keyed by "tileX,tileY".
   * Value is remaining milliseconds until the tile reverts to GRASS.
   */
  tileRecovery: Record<string, number>
}

export interface GameStateData {
  version: number
  world: WorldState
  player: PlayerState
}

export type GameAction =
  | { type: 'PLAYER_MOVE';               x: number; y: number }
  | { type: 'HARVEST_RESOURCE';          resourceId: string; rewards: Partial<Record<ItemId, number>> }
  | { type: 'CHANGE_TILE';               tileX: number; tileY: number; tile: TileType }
  | { type: 'PLACE_BUILDING';            building: BuildingState; costs: Partial<Record<ItemId, number>> }
  | { type: 'REMOVE_BUILDING';           buildingId: string }
  | { type: 'ADD_ITEMS';                 items: Partial<Record<ItemId, number>> }
  | { type: 'PLANT_CROP';               crop: CropState; seedItem: ItemId }
  | { type: 'WATER_CROP';               cropId: string }
  | { type: 'HARVEST_CROP';             cropId: string; rewards: Partial<Record<ItemId, number>> }
  | { type: 'SPAWN_VILLAGER';           villager: VillagerState }
  | { type: 'VILLAGER_SET_JOB';         villagerId: string; job: VillagerJob | null }
  | { type: 'VILLAGER_SET_AI';          villagerId: string; aiState: AIState }
  | { type: 'VILLAGER_HARVEST_RESOURCE'; villagerId: string; resourceId: string }
  | { type: 'VILLAGER_HARVEST_CROP';    villagerId: string; cropId: string }
  | { type: 'VILLAGER_DEPOSIT';         villagerId: string }
  | { type: 'UPDATE_PRIORITIES';        villagerId: string; priorities: JobPriorities }
  | { type: 'PLANT_TREE_SEED';         seedling: TreeSeedlingState }
  | { type: 'REMOVE_TREE_SEEDLING';    seedlingId: string }
  | { type: 'SPAWN_RESOURCE';          resource: ResourceNodeState }
  | { type: 'TILE_RECOVERY_START';     tileX: number; tileY: number }