local chat_log = adaptive_ai.chat_log
local breeding = adaptive_ai.breeding
local random = math.random
local floor = math.floor
local pop = adaptive_ai.helper.pop
local load_file = adaptive_ai.helper.load_file

local default_size = 10
local default_range = 20
local timer = 0
local dirty = false

population = {}
tribes = {}
populs = {}
census = {}

--local lfs = require "lfs"

--local mkdir = minetest.mkdir or lfs.mkdir

local mkdir = minetest.mkdir or function(path)
    os.execute("mkdir \"" .. path .. "\"")
end

local path = adaptive_ai.path.."population_"

local file_tag = {"tribe_list", "census"}

local function save_census(save)
    local file, to_file, count, gene_copy
    count = 0
    for _,c in pairs(census) do
        count = count + 1
        gene_copy = c.genes
        c.genes = nil
        to_file = (minetest.serialize(c))
        file = io.open(path..file_tag[2].."\\"..c.name..".txt", "w")
        if not file then
            mkdir(path..file_tag[2])
            file = io.open(path..file_tag[2].."\\"..c.name..".txt", "w")
        end
        file:write(save == false and "" or to_file)
        file:close()
        c.genes = gene_copy

        to_file = (minetest.serialize(gene_copy))
        file = io.open(path..file_tag[2].."\\"..c.name.." genes.txt", "w")
        file:write(save == false and "" or to_file)
        file:close()
    end
    chat_log("Census: "..count)
end

local function get_from_census(entity)
    if not entity.nametag then return nil end

    local name = entity.nametag--:gsub("%s", "_")
    local from_file = load_file(path..file_tag[2].."\\"..name..".txt")
    local genes_file = load_file(path..file_tag[2].."\\"..name.." genes.txt")

    local creature = from_file or nil
    if creature then
        creature.genes = genes_file
        table.insert(census, creature)

        local t_id = creature.tribe_id
        if not tribes[t_id] then
            local tribe = {}
            tribe.pos = creature.pos
            tribe.name = entity.name
            tribe.range = default_range
            tribe.size = default_size
            tribe.id = t_id

            tribes[t_id] = tribe
            chat_log("Created tribe #"..t_id)
        end
        if not populs[t_id] then
            populs[t_id] = {creature}
            chat_log("Created popul #"..t_id)
        else
            table.insert(populs[t_id], creature)
            chat_log("Increased popul #"..t_id)
        end
    end

    return creature
end

local function save_to_file(save)
    local file = io.open(path..file_tag[1]..".txt", "w")
    local to_file = (minetest.serialize(tribes))
    file:write(to_file)
    file:close()
    save_census(save)

    timer = 0
    dirty = false
end

local function load_tribes()
    local from_file = load_file(path..file_tag[1]..".txt")--, true)
    tribes = from_file or {}

    --error(#tribes > 0 and "Tribes loaded succesfully" or "Tribes not loaded")
    --error(#census > 0 and "Census loaded succesfully" or "Census not loaded")
end

local function add_to_census(creature)
    local c_name, c_tag, disambiguate = creature.name, creature.tag, 1
    while census[creature.name] ~= nil do
        creature.name = c_name.." "..disambiguate
        disambiguate = disambiguate + 1
    end
    census[creature.name] = creature
    chat_log("New censused creature: "..creature.name)
end

local function fill_tribe(tribe, popul)
    local breed, asexual = breeding[tribe.name].breed, breeding[tribe.name].asexual
    local pos, t_id, range = tribe.pos, tribe.id, tribe.range

    --math.randomseed(os.time())
    local creature, p, i, j
    while #popul < tribe.size do
        p = {x=floor(pos.x+0.5), y=floor(pos.y+1), z=floor(pos.z+0.5)}
        p.x = p.x + random(0,range) - floor(range/2 + 0.5)
        p.z = p.z + random(0,range) - floor(range/2 + 0.5)

        i = random(#popul)
        if asexual then
            creature = {}
            creature = breed(creature, popul[i])
        else
            repeat
                j = random(#popul)
            until i ~= j
            creature = {}
            creature = breed(creature, popul[i], popul[j])
        end

        creature.pos = p
        creature.tribe_id = t_id
        --chat_log("Created "..creature.name)

        table.insert(popul, creature)
        add_to_census(creature)
    end

    populs[t_id] = popul
end

local function create_tribe(pos, name, founders, range, clone, size)
    if not founders or #founders == 0 then
        error("Not enough creatures in starting population.")
    end

    local tribe = {}
    tribe.pos = pos
    tribe.name = name
    tribe.range = range
    tribe.size = size or default_size
    tribe.id = #tribes + 1
    local popul = {}

    local p, f
    for _,father in ipairs(founders) do
        f = {}
        f = clone(father, f)
        --chat_log("Cloned "..f.name)
        f.tribe_id = tribe.id
        p = {x=floor(pos.x+0.5), y=floor(pos.y+0.5), z=floor(pos.z+0.5)}
        p.x = p.x + random(0,range) - floor(range/2 + 0.5)
        p.z = p.z + random(0,range) - floor(range/2 + 0.5)
        f.pos = p
        table.insert(popul, f)
        add_to_census(f)
    end

    fill_tribe(tribe, popul)
    table.insert(tribes, tribe)
    save_to_file()

    return popul
end

local function get_tribe(t_id)
    --chat_log(tribes[t_id] and "Getting tribe" or "Not getting tribe")

    return tribes[t_id]
end

local function get_popul_size(t_id)
    return populs[t_id] and #populs[t_id] or nil
end

local function get_couple(creature)
    local p = populs[creature.tribe_id]
    local i
    repeat
        i = random(#p)
    until p[i].name ~= creature.name

    return p[i]
end

local function empty()
    for i,t in ipairs(tribes) do
        t = {}
    end
    for i,c in ipairs(populs) do
        c.delete = true
    end
    tribes = {}
    census = {}

    save_census(false)
    save_to_file()
end

local function add_to_tribe(t_id, creature)
    creature.tribe_id = t_id
    table.insert(populs[t_id], creature)
    census[creature.name] = creature
    dirty = true
end

minetest.register_globalstep(function(dtime)
	timer = timer + dtime;
	if timer >= 30 and dirty then
		save_to_file()
	end
end)

minetest.register_on_shutdown(function()
    adaptive_ai.population.save_to_file()
end)

population.tribes = tribes
population.load_tribes = load_tribes
population.create_tribe = create_tribe
population.get_from_census = get_from_census
population.add_to_tribe = add_to_tribe
population.empty = empty
population.get_couple = get_couple
population.default_size = default_size
population.default_range = default_range
population.save_to_file = save_to_file
population.get_tribe = get_tribe
population.get_popul_size = get_popul_size

adaptive_ai.population = population