local table_insert = table.insert
local math_random = math.random
local math_floor = math.floor
local math_abs = math.abs

local get_noise = require 'utils.get_noise'
local Scrap = require 'modules.scrap_towny_ffa.scrap'
require 'modules.no_deconstruction_of_neutral_entities'

local scrap_entities = {
    -- simple entity
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'small-ship-wreck'}, -- these are not mineable normally
    {name = 'medium-ship-wreck'}, -- these are not mineable normally
    {name = 'medium-ship-wreck'}, -- these are not mineable normally
    {name = 'medium-ship-wreck'}, -- these are not mineable normally
    {name = 'medium-ship-wreck'}, -- these are not mineable normally
    -- simple entity with owner
    {name = 'crash-site-spaceship-wreck-small-1'}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-small-1'}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-small-2'}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-small-3'}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-small-4'}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-small-5'}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-small-6'} -- these do not have mining animation
}

local scrap_entities_index = table.size(scrap_entities)

local scrap_containers = {
    -- containers
    {name = 'big-ship-wreck-1', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-1', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-1', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-2', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-2', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-2', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-3', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-3', size = 3}, -- these are not mineable normally
    {name = 'big-ship-wreck-3', size = 3}, -- these are not mineable normally
    {name = 'crash-site-chest-1', size = 8}, -- these do not have mining animation
    {name = 'crash-site-chest-2', size = 8}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-1', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-1', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-1', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-1', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-2', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-2', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-2', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-2', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-3', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-3', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-3', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-medium-3', size = 1}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-big-1', size = 2}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-big-1', size = 2}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-big-1', size = 2}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-big-2', size = 2}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-big-2', size = 2}, -- these do not have mining animation
    {name = 'crash-site-spaceship-wreck-big-2', size = 2} -- these do not have mining animation
}
local scrap_containers_index = table.size(scrap_containers)

-- loot chances and amounts for scrap containers

local container_loot_chance = {
    {name = 'advanced-circuit', chance = 5},
    {name = 'artillery-shell', chance = 1},
    {name = 'cannon-shell', chance = 2},
    {name = 'cliff-explosives', chance = 5},
    --{name = "cluster-grenade", chance = 2},
    {name = 'construction-robot', chance = 1},
    {name = 'copper-cable', chance = 250},
    {name = 'copper-plate', chance = 500},
    {name = 'crude-oil-barrel', chance = 30},
    {name = 'defender-capsule', chance = 5},
    {name = 'destroyer-capsule', chance = 1},
    {name = 'distractor-capsule', chance = 2},
    {name = 'electric-engine-unit', chance = 2},
    {name = 'electronic-circuit', chance = 200},
    {name = 'empty-barrel', chance = 10},
    {name = 'engine-unit', chance = 7},
    {name = 'explosive-cannon-shell', chance = 2},
    --{name = "explosive-rocket", chance = 3},
    {name = 'explosive-uranium-cannon-shell', chance = 1},
    {name = 'explosives', chance = 5},
    {name = 'green-wire', chance = 10},
    {name = 'grenade', chance = 10},
    {name = 'heat-pipe', chance = 1},
    {name = 'heavy-oil-barrel', chance = 15},
    {name = 'iron-gear-wheel', chance = 500},
    {name = 'iron-plate', chance = 750},
    {name = 'iron-stick', chance = 50},
    {name = 'land-mine', chance = 3},
    {name = 'light-oil-barrel', chance = 15},
    {name = 'logistic-robot', chance = 1},
    {name = 'low-density-structure', chance = 1},
    {name = 'lubricant-barrel', chance = 20},
    {name = 'nuclear-fuel', chance = 1},
    {name = 'petroleum-gas-barrel', chance = 15},
    {name = 'pipe', chance = 100},
    {name = 'pipe-to-ground', chance = 10},
    {name = 'plastic-bar', chance = 5},
    {name = 'processing-unit', chance = 2},
    {name = 'red-wire', chance = 10},
    --{name = "rocket", chance = 3},  {name = "battery", chance = 20},
    {name = 'rocket-control-unit', chance = 1},
    {name = 'rocket-fuel', chance = 3},
    {name = 'solid-fuel', chance = 100},
    {name = 'steel-plate', chance = 150},
    {name = 'sulfuric-acid-barrel', chance = 15},
    {name = 'uranium-cannon-shell', chance = 1},
    {name = 'uranium-fuel-cell', chance = 1},
    {name = 'used-up-uranium-fuel-cell', chance = 1},
    {name = 'water-barrel', chance = 10}
}

local container_loot_amounts = {
    ['advanced-circuit'] = 2,
    ['artillery-shell'] = 0.3,
    ['battery'] = 2,
    ['cannon-shell'] = 2,
    ['cliff-explosives'] = 2,
    --["cluster-grenade"] = 0.3,
    ['construction-robot'] = 0.3,
    ['copper-cable'] = 24,
    ['copper-plate'] = 16,
    ['crude-oil-barrel'] = 3,
    ['defender-capsule'] = 2,
    ['destroyer-capsule'] = 0.3,
    ['distractor-capsule'] = 0.3,
    ['electric-engine-unit'] = 2,
    ['electronic-circuit'] = 8,
    ['empty-barrel'] = 3,
    ['engine-unit'] = 2,
    ['explosive-cannon-shell'] = 2,
    --["explosive-rocket"] = 2,
    ['explosive-uranium-cannon-shell'] = 2,
    ['explosives'] = 4,
    ['green-wire'] = 8,
    ['grenade'] = 2,
    ['heat-pipe'] = 1,
    ['heavy-oil-barrel'] = 3,
    ['iron-gear-wheel'] = 8,
    ['iron-plate'] = 16,
    ['iron-stick'] = 16,
    ['land-mine'] = 1,
    ['light-oil-barrel'] = 3,
    ['logistic-robot'] = 0.3,
    ['low-density-structure'] = 0.3,
    ['lubricant-barrel'] = 3,
    ['nuclear-fuel'] = 0.1,
    ['petroleum-gas-barrel'] = 3,
    ['pipe'] = 8,
    ['pipe-to-ground'] = 1,
    ['plastic-bar'] = 4,
    ['processing-unit'] = 1,
    ['red-wire'] = 8,
    --["rocket"] = 2,
    ['rocket-control-unit'] = 0.3,
    ['rocket-fuel'] = 0.3,
    ['solid-fuel'] = 4,
    ['steel-plate'] = 4,
    ['sulfuric-acid-barrel'] = 3,
    ['uranium-cannon-shell'] = 2,
    ['uranium-fuel-cell'] = 0.3,
    ['used-up-uranium-fuel-cell'] = 1,
    ['water-barrel'] = 3
}

local scrap_raffle = {}
for _, t in pairs(container_loot_chance) do
    for _ = 1, t.chance, 1 do
        table_insert(scrap_raffle, t.name)
    end
end

local size_of_scrap_raffle = #scrap_raffle

local function place_scrap(surface, position)
    -- place turrets
    if math_random(1, 700) == 1 then
        if position.x ^ 2 + position.x ^ 2 > 4096 then
            local e = surface.create_entity({name = 'gun-turret', position = position, force = 'enemy'})
            e.minable = false
            e.operable = false
            e.insert({name = 'piercing-rounds-magazine', count = 100})
            return
        end
    end

    -- place spaceship with loot
    if math_random(1, 8192) == 1 then
        local e = surface.create_entity({name = 'crash-site-spaceship', position = position, force = 'neutral'})
        e.minable = true
        local i = e.get_inventory(defines.inventory.chest)
        if i then
            for _ = 1, math_random(1, 5), 1 do
                local loot = scrap_raffle[math_random(1, size_of_scrap_raffle)]
                local amount = container_loot_amounts[loot]
                local count = math_floor(amount * math_random(5, 35) * 0.1) + 1
                i.insert({name = loot, count = count})
            end
        end
        return
    end

    -- place scrap containers with loot
    if math_random(1, 128) == 1 then
        local scrap = scrap_containers[math_random(1, scrap_containers_index)]
        local e = surface.create_entity({name = scrap.name, position = position, force = 'neutral'})
        e.minable = true
        local i = e.get_inventory(defines.inventory.chest)
        if i then
            local size = scrap.size
            for _ = 1, math_random(1, size), 1 do
                local loot = scrap_raffle[math_random(1, size_of_scrap_raffle)]
                local amount = container_loot_amounts[loot]
                local count = math_floor(amount * math_random(5, 35) * 0.1) + 1
                i.insert({name = loot, count = count})
            end
        end
        return
    end

    -- place scrap entities with loot
    local scrap = scrap_entities[math_random(1, scrap_entities_index)]
    local e = surface.create_entity({name = scrap.name, position = position, force = 'neutral'})
    e.minable = true
end

local function is_scrap_area(n)
    if n > 0.5 then
        return true
    end
    if n < -0.5 then
        return true
    end
end

local function move_away_biteys(surface, area)
    for _, e in pairs(surface.find_entities_filtered({type = {'unit-spawner', 'turret', 'unit'}, area = area})) do
        local position = surface.find_non_colliding_position(e.name, e.position, 96, 4)
        if position then
            surface.create_entity({name = e.name, position = position, force = 'enemy'})
            e.destroy()
        end
    end
end

local vectors = {{0, 0}, {1, 0}, {-1, 0}, {0, 1}, {0, -1}}

local function landfill_under(entity)
    -- landfill the area under the entity
    local surface = entity.surface
    for _, v in pairs(vectors) do
        local position = {entity.position.x + v[1], entity.position.y + v[2]}
        if not surface.get_tile(position).collides_with('resource-layer') then
            surface.set_tiles({{name = 'landfill', position = position}}, true)
        end
    end
end

local function on_player_mined_entity(event)
    local entity = event.entity
    if not entity.valid then
        return
    end
    if Scrap.is_scrap(entity) then
        landfill_under(entity)
    end
end

local function on_entity_died(event)
    local entity = event.entity
    if not entity.valid then
        return
    end
    if Scrap.is_scrap(entity) then
        landfill_under(entity)
    end
end

--local function on_init(event)
--
--end

local function on_chunk_generated(event)
    --log("scrap_towny_ffa::on_chunk_generated")
    local surface = event.surface
    local seed = surface.map_gen_settings.seed
    local left_top_x = event.area.left_top.x
    local left_top_y = event.area.left_top.y
    --log("  chunk = {" .. left_top_x/32 .. ", " .. left_top_y/32 .. "}")
    local position
    local noise
    for x = 0, 31, 1 do
        for y = 0, 31, 1 do
            if math_random(1, 3) > 1 then
                position = {x = left_top_x + x, y = left_top_y + y}
                if not surface.get_tile(position).collides_with('resource-layer') then
                    noise = get_noise('scrap_towny_ffa', position, seed)
                    if is_scrap_area(noise) then
                        surface.set_tiles({{name = 'dirt-' .. math_floor(math_abs(noise) * 6) % 6 + 2, position = position}}, true)
                        place_scrap(surface, position)
                    end
                end
            end
        end
    end
    move_away_biteys(surface, event.area)
    --ffatable.chunk_generated[key] = true
end

local function on_chunk_charted(event)
    local force = event.force
    local surface = game.surfaces[event.surface_index]
    if force.valid then
        if force == game.forces['player'] or force == game.forces['rogue'] then
            force.clear_chart(surface)
        end
    end
end

-- local on_init = function ()
-- 	local ffatable = Table.get_table()
--  ffatable.chunk_generated = {}
-- end

local Event = require 'utils.event'
-- Event.on_init(on_init)
Event.add(defines.events.on_chunk_generated, on_chunk_generated)
Event.add(defines.events.on_chunk_charted, on_chunk_charted)
Event.add(defines.events.on_player_mined_entity, on_player_mined_entity)
Event.add(defines.events.on_entity_died, on_entity_died)