-- imports

local entityUtils = require("libs/EntityUtils")
local unitGroupUtils = require("libs/UnitGroupUtils")
local chunkProcessor = require("libs/ChunkProcessor")
local mapProcessor = require("libs/MapProcessor")
local constants = require("libs/Constants")
local pheromoneUtils = require("libs/PheromoneUtils")
local aiDefense = require("libs/AIDefense")
local aiAttack = require("libs/AIAttack")
local aiBuilding = require("libs/AIBuilding")
local aiPlanning = require("libs/AIPlanning")
local mathUtils = require("libs/MathUtils")
local tests = require("tests")

-- constants

local INTERVAL_LOGIC = constants.INTERVAL_LOGIC
local INTERVAL_PROCESS = constants.INTERVAL_PROCESS

-- imported functions

local processPendingChunks = chunkProcessor.processPendingChunks

local processMap = mapProcessor.processMap
local processPlayers = mapProcessor.processPlayers
local scanMap = mapProcessor.scanMap

local planning = aiPlanning.planning
local removeScout = aiBuilding.removeScout
-- local scouting = aiBuilding.scouting

local deathScent = pheromoneUtils.deathScent

local regroupSquads = unitGroupUtils.regroupSquads
local convertUnitGroupToSquad = unitGroupUtils.convertUnitGroupToSquad

local squadAttack = aiAttack.squadAttack
local squadBeginAttack = aiAttack.squadBeginAttack

local retreatUnits = aiDefense.retreatUnits

local addRemoveEntity = entityUtils.addRemoveEntity

local roundToNearest = mathUtils.roundToNearest

-- local references to global

local regionMap
local natives
local pendingChunks

-- hook functions

local function onLoad()
    regionMap = global.regionMap
    natives = global.natives
    pendingChunks = global.pendingChunks
end

local function onChunkGenerated(event)
    -- queue generated chunk for delayed processing, queuing is required because some mods (RSO) mess with chunk as they
    -- are generated, which messes up the scoring.
    if (event.surface.index == 1) then
        pendingChunks[#pendingChunks+1] = event
    end
end

local function onConfigChanged()
    if (global.version == nil) then

        -- removed in version 9
        -- regionMap.pQ = {{}} -- processing queue
        -- regionMap.pI = 1 -- insertion location for chunk processing
        -- regionMap.pP = 1 -- index for the chunk set to process
        -- regionMap.pR = -1 -- current processing roll
        natives.squads = {}
        natives.scouts = {}
        natives.tunnels = {}
        natives.points = 0
        pendingChunks = {}
        
        global.version = constants.VERSION_5
    end
    if (global.version < constants.VERSION_9) then
	
        -- remove version 5 references
        regionMap.pQ = nil
        regionMap.pI = nil
        regionMap.pP = nil
        regionMap.pR = nil
      
	global.version = constants.VERSION_9
    end
    if (global.version < constants.VERSION_10) then
	for _,squad in pairs(natives.squads) do
	    squad.frenzy = false
	    squad.frenzyPosition = {x=0,y=0}
	    squad.rabid = false
	end
	
	global.version = constants.VERSION_10
    end
    if (global.version < constants.VERSION_11) then
	natives.state = constants.AI_STATE_AGGRESSIVE
	natives.temperament = 0
	-- needs to be on inner logic tick loop interval
	natives.stateTick = roundToNearest(game.tick + INTERVAL_LOGIC, INTERVAL_LOGIC)
	natives.temperamentTick = roundToNearest(game.tick + INTERVAL_LOGIC, INTERVAL_LOGIC)
	
	global.version = constants.VERSION_11
    end
    if (global.version < constants.VERSION_12) then
	for _,squad in pairs(natives.squads) do
	    squad.status = constants.SQUAD_GUARDING
	    squad.kamikaze = false
	end
	
	-- reset ai build points due to error in earning points
	natives.points = 0
	
	-- clear old regionMap processing Queue
	-- prevents queue adding duplicate chunks
	-- chunks are by key, so should overwrite old
	regionMap.processQueue = {}
	regionMap.processPointer = 1
	regionMap.scanPointer = 1
	-- clear pending chunks, will be added when loop runs below
	pendingChunks = {} 

	-- queue all current chunks that wont be generated during play
	local surface = game.surfaces[1]
	for chunk in surface.get_chunks() do
	    onChunkGenerated({ surface = surface, 
			       area = { left_top = { x = chunk.x * 32,
						     y = chunk.y * 32 }}})
	end

	global.version = constants.VERSION_12
    end
end

local function onTick(event)
    local tick = event.tick
    if (tick % INTERVAL_PROCESS == 0) then
	local surface = game.surfaces[1]
	local evolutionFactor = game.evolution_factor
	local players = game.players
	
	processPendingChunks(regionMap, surface, pendingChunks)
	scanMap(regionMap, surface)

	if (tick % INTERVAL_LOGIC == 0) then
	    planning(natives, evolutionFactor, tick)
	    
	    regroupSquads(natives)
	    
	    processPlayers(players, regionMap, surface, natives, evolutionFactor, tick)
	    
	    -- scouting(regionMap, natives)
	    
	    squadBeginAttack(natives, players, evolutionFactor)
	    squadAttack(regionMap, surface, natives)
	end

	processMap(regionMap, surface, natives, evolutionFactor) 
    end
end

local function onBuild(event)
    addRemoveEntity(regionMap, event.created_entity, natives, true, false)
end

local function onPickUp(event)
    addRemoveEntity(regionMap, event.entity, natives, false, false)
end

local function onDeath(event)
    local entity = event.entity
    local surface = entity.surface
    if (surface.index == 1) then
        if (entity.force.name == "enemy") then
            if (entity.type == "unit") then
                local entityPosition = entity.position
                
                -- drop death pheromone where unit died
                deathScent(regionMap, entityPosition)
                
                if (event.force ~= nil) and (event.force.name == "player") then 
		    retreatUnits(entityPosition, 
				 convertUnitGroupToSquad(natives, 
							 entity.unit_group),
				 regionMap, 
				 surface, 
				 natives)
                end
                
                removeScout(entity, global.natives)
            elseif (entity.type == "unit-spawner") then
                addRemoveEntity(regionMap, entity, natives, false, false)
            end
        elseif (entity.force.name == "player") then
	    local creditNatives = false
	    if (event.force ~= nil) and (event.force.name == "enemy") then
		creditNatives = true
	    end
	    addRemoveEntity(regionMap, entity, natives, false, creditNatives)
        end
    end
end

local function onSurfaceTileChange(event)
    -- local player = game.players[event.player_index]
    -- if (player.surface.index==1) then
    -- aiBuilding.fillTunnel(global.regionMap, player.surface, global.natives, event.positions)
    -- end
end

local function onInit()
    global.regionMap = {}
    global.pendingChunks = {}
    global.natives = {}
    
    regionMap = global.regionMap
    natives = global.natives
    pendingChunks = global.pendingChunks
    
    onConfigChanged()
end


-- hooks

script.on_init(onInit)
script.on_load(onLoad)
script.on_configuration_changed(onConfigChanged)

script.on_event(defines.events.on_player_built_tile, onSurfaceTileChange)

script.on_event({defines.events.on_preplayer_mined_item,
                 defines.events.on_robot_pre_mined}, 
    onPickUp)
script.on_event({defines.events.on_built_entity,
                 defines.events.on_robot_built_entity}, 
    onBuild)

script.on_event(defines.events.on_entity_died, onDeath)
script.on_event(defines.events.on_tick, onTick)
script.on_event(defines.events.on_chunk_generated, onChunkGenerated)

remote.add_interface("rampant", {
			 test1 = tests.test1,
			 test2 = tests.test2,
			 test3 = tests.test3,
			 test4 = tests.test4,
			 test5 = tests.test5,
			 test6 = tests.test6,
			 test7 = tests.test7,
			 test8 = tests.test8,
			 test9 = tests.test9,
			 test10 = tests.test10,
			 test11 = tests.test11
})