local constants = {}

-- versions

constants.VERSION_5 = 5
constants.VERSION_10 = 10
constants.VERSION_11 = 11
constants.VERSION_12 = 12
constants.VERSION_16 = 16
constants.VERSION_18 = 18
constants.VERSION_20 = 20
constants.VERSION_22 = 22
constants.VERSION_23 = 23
constants.VERSION_25 = 25
constants.VERSION_26 = 26
constants.VERSION_27 = 27
constants.VERSION_28 = 28
constants.VERSION_33 = 33
constants.VERSION_38 = 38

-- misc

constants.WATER_TILE_NAMES = { "water", "deepwater", "water-green", "deepwater-green" }

constants.CHUNK_SIZE_DIVIDER = 0.03125
constants.MAGIC_MAXIMUM_NUMBER = 1e99 -- used in loops trying to find the lowest/highest score
constants.MAGIC_MAXIMUM_BASE_NUMBER = 100000000
constants.RETREAT_MOVEMENT_PHEROMONE_LEVEL = 10000

constants.PROCESS_QUEUE_SIZE = 400
constants.SCAN_QUEUE_SIZE = 5
constants.BASE_QUEUE_SIZE = 1
constants.SQUAD_QUEUE_SIZE = 2
constants.PROCESS_PLAYER_BOUND = 128

constants.TICKS_A_SECOND = 60
constants.TICKS_A_MINUTE = constants.TICKS_A_SECOND * 60

constants.INTERVAL_PROCESS = 19
constants.INTERVAL_SCAN = 21
constants.INTERVAL_CHUNK = 17
constants.INTERVAL_LOGIC = 61
constants.INTERVAL_SQUAD = 41

constants.RESOURCE_GENERATOR_INCREMENT = 0.001

constants.PLAYER_PHEROMONE_MULTIPLER = 100

constants.DEV_CUSTOM_AI = false

-- chunk properties

constants.CHUNK_SIZE = 32
constants.DOUBLE_CHUNK_SIZE = constants.CHUNK_SIZE * 2
constants.TRIPLE_CHUNK_SIZE = constants.CHUNK_SIZE * 3
constants.HALF_CHUNK_SIZE = constants.CHUNK_SIZE / 2
constants.QUARTER_CHUNK_SIZE = constants.HALF_CHUNK_SIZE / 2

constants.CHUNK_IMPASSABLE = 0
constants.CHUNK_NORTH_SOUTH = 1
constants.CHUNK_EAST_WEST = 2
constants.CHUNK_ALL_DIRECTIONS = 3
-- constants.CHUNK_PLAYER_BORDER = 4
-- constants.CHUNK_PLAYER_INTERIOR = 5

constants.BASE_SEARCH_RADIUS = 4 * constants.CHUNK_SIZE

-- ai

constants.AI_POINT_GENERATOR_AMOUNT = 6
constants.AI_SCOUT_COST = 45
constants.AI_SQUAD_COST = 175
constants.AI_NEST_COST = 10
constants.AI_WORM_COST = 2
constants.AI_VENGENCE_SQUAD_COST = 45
constants.AI_SETTLER_COST = 75
constants.AI_BASE_BUILDING_COST = 500
constants.AI_TUNNEL_COST = 100
constants.AI_MAX_POINTS = 10000
constants.AI_MAX_OVERFLOW_POINTS = constants.AI_MAX_POINTS * 3

constants.AI_UNIT_REFUND = 3

-- constants.AI_MAX_SQUAD_COUNT = 30
constants.AI_MAX_BITER_GROUP_SIZE = 450

constants.AI_SQUAD_MERGE_THRESHOLD = constants.AI_MAX_BITER_GROUP_SIZE * 0.75

constants.AI_STATE_PEACEFUL = 1
constants.AI_STATE_AGGRESSIVE = 2
constants.AI_STATE_NOCTURNAL = 3

constants.AI_MIN_STATE_DURATION = 1
constants.AI_MAX_STATE_DURATION = 4
constants.AI_MIN_TEMPERAMENT_DURATION = 5
constants.AI_MAX_TEMPERAMENT_DURATION = 15

-- ai base

constants.BASE_DISTANCE_THRESHOLD = 15 * constants.CHUNK_SIZE

constants.BASE_ALIGNMENT_NEUTRAL = 1
constants.BASE_ALIGNMENT_FIRE = 2
constants.BASE_ALIGNMENT_BURROW = 3
constants.BASE_ALIGNMENT_SUICIDE = 4
constants.BASE_ALIGNMENT_INFEST = 5

-- ai retreat

constants.NO_RETREAT_BASE_PERCENT = 0.10
constants.NO_RETREAT_EVOLUTION_BONUS_MAX = 0.25
constants.NO_RETREAT_SQUAD_SIZE_BONUS_MAX = 0.40

-- pheromone amounts

constants.MOVEMENT_PHEROMONE_GENERATOR_AMOUNT = 500
constants.DEATH_PHEROMONE_GENERATOR_AMOUNT = 500
constants.PLAYER_PHEROMONE_GENERATOR_AMOUNT = 150

constants.IMPASSABLE_TERRAIN_GENERATOR_AMOUNT = -0.1

-- pheromone diffusion amounts

constants.MOVEMENT_PHEROMONE_PERSISTANCE = 0.9
constants.BASE_PHEROMONE_PERSISTANCE = 0.99
constants.PLAYER_PHEROMONE_PERSISTANCE = 0.98
constants.RESOURCE_PHEROMONE_PERSISTANCE = 0.9

-- chunk attributes

constants.MOVEMENT_PHEROMONE = 1
constants.BASE_PHEROMONE = 2
constants.PLAYER_PHEROMONE = 3
constants.RESOURCE_PHEROMONE = 4

constants.PASSABLE = 5

constants.CHUNK_TICK = 6

constants.PATH_RATING = 7

-- Squad status

constants.SQUAD_RETREATING = 1 -- used during squad retreat
constants.SQUAD_GUARDING = 2 -- used when squad is idle
constants.SQUAD_BURROWING = 3
constants.SQUAD_RAIDING = 4 -- used when player stuff is close

-- Squad Related

constants.RETREAT_GRAB_RADIUS = 24
constants.RETREAT_SPAWNER_GRAB_RADIUS = 75

constants.BASE_RALLY_CHANCE = 0.02
constants.BONUS_RALLY_CHANCE = 0.06

constants.RALLY_CRY_DISTANCE = 96

constants.GROUP_MERGE_DISTANCE = 28

constants.MAX_PENALTY_BEFORE_PURGE = 8000

-- player building pheromones

constants.BUILDING_PHEROMONES = {}
constants.BUILDING_PHEROMONES["generator"] = 8
constants.BUILDING_PHEROMONES["pump"] = 2
constants.BUILDING_PHEROMONES["reactor"] = 16
constants.BUILDING_PHEROMONES["offshore-pump"] = 2
constants.BUILDING_PHEROMONES["transport-belt"] = 1
constants.BUILDING_PHEROMONES["accumulator"] = 10
constants.BUILDING_PHEROMONES["solar-panel"] = 8
constants.BUILDING_PHEROMONES["boiler"] = 12
constants.BUILDING_PHEROMONES["assembling-machine"] = 10
constants.BUILDING_PHEROMONES["roboport"] = 10
constants.BUILDING_PHEROMONES["beacon"] = 10
constants.BUILDING_PHEROMONES["furnace"] = 12
constants.BUILDING_PHEROMONES["programmable-speaker"] = 8
constants.BUILDING_PHEROMONES["mining-drill"] = 35
constants.BUILDING_PHEROMONES["rocket-silo"] = 120
constants.BUILDING_PHEROMONES["lamp"] = 4
constants.BUILDING_PHEROMONES["radar"] = 20
constants.BUILDING_PHEROMONES["lab"] = 15

-- player defense pheromones

constants.BUILDING_PHEROMONES["ammo-turret"] = 10
constants.BUILDING_PHEROMONES["wall"] = 0.5
constants.BUILDING_PHEROMONES["electric-turret"] = 20
constants.BUILDING_PHEROMONES["fluid-turret"] = 28
constants.BUILDING_PHEROMONES["turret"] = 10
constants.BUILDING_PHEROMONES["artillery-turret"] = 100

constants.RETREAT_FILTER = {}
constants.RETREAT_FILTER[constants.SQUAD_RETREATING] = true

-- map settings tweaks

constants.PATH_FINDER_SHORT_REQUEST_RATIO = 0.8
constants.PATH_FINDER_SHORT_CACHE_SIZE = 25
constants.PATH_FINDER_LONG_REQUEST_RATIO = 5
constants.PATH_FINDER_MIN_STEPS_TO_CHECK_PATH = 1000

constants.MAX_FAILED_BEHAVIORS = 10

constants.UNIT_GROUP_DISOWN_DISTANCE = 10
constants.UNIT_GROUP_TICK_TOLERANCE = 360

constants.UNIT_GROUP_MAX_RADIUS = 20
constants.UNIT_GROUP_MAX_SPEED_UP = 1.1
constants.UNIT_GROUP_MAX_SLOWDOWN = 1.0
constants.UNIT_GROUP_SLOWDOWN_FACTOR = 0.9

-- sentinels

constants.SENTINEL_IMPASSABLE_CHUNK = {}

constants.SENTINEL_IMPASSABLE_CHUNK.name = "ImpassableChunk"
constants.SENTINEL_IMPASSABLE_CHUNK[constants.MOVEMENT_PHEROMONE] = constants.IMPASSABLE_TERRAIN_GENERATOR_AMOUNT
constants.SENTINEL_IMPASSABLE_CHUNK[constants.BASE_PHEROMONE] = constants.IMPASSABLE_TERRAIN_GENERATOR_AMOUNT
constants.SENTINEL_IMPASSABLE_CHUNK[constants.PLAYER_PHEROMONE] = constants.IMPASSABLE_TERRAIN_GENERATOR_AMOUNT
constants.SENTINEL_IMPASSABLE_CHUNK[constants.RESOURCE_PHEROMONE] = constants.IMPASSABLE_TERRAIN_GENERATOR_AMOUNT
constants.SENTINEL_IMPASSABLE_CHUNK[constants.PASSABLE] = constants.CHUNK_IMPASSABLE
constants.SENTINEL_IMPASSABLE_CHUNK[constants.CHUNK_TICK] = 0
constants.SENTINEL_IMPASSABLE_CHUNK[constants.PATH_RATING] = 0
constants.SENTINEL_IMPASSABLE_CHUNK.x = -1
constants.SENTINEL_IMPASSABLE_CHUNK.y = -1

-- unit spawners

constants.SUICIDE_NEST_TIERS = 7
constants.SUICIDE_NEST_VARIATIONS = 5

return constants