local Public = {}
local math_random = math.random

local Table = require 'modules.scrap_towny_ffa.table'
local Scrap = require 'modules.scrap_towny_ffa.scrap'

local pollution_index = {
    ['small-biter'] = {min = 0.1, max = 0.1},
    ['medium-biter'] = {min = 0.1, max = 0.2},
    ['big-biter'] = {min = 0.1, max = 0.3},
    ['behemoth-biter'] = {min = 0.1, max = 0.4},
    ['small-spitter'] = {min = 0.1, max = 0.1},
    ['medium-spitter'] = {min = 0.1, max = 0.2},
    ['big-spitter'] = {min = 0.1, max = 0.3},
    ['behemoth-spitter'] = {min = 0.2, max = 0.4},
    ['small-worm-turret'] = {min = 0.1, max = 0.1},
    ['medium-worm-turret'] = {min = 0.1, max = 0.2},
    ['big-worm-turret'] = {min = 0.1, max = 0.3},
    ['behemoth-worm-turret'] = {min = 0.2, max = 0.4},
    ['biter-spawner'] = {min = 0.5, max = 2.5},
    ['spitter-spawner'] = {min = 0.5, max = 2.5},
    ['mineable-wreckage'] = {min = 0.1, max = 0.1},
    ['small-ship-wreck'] = {min = 0.1, max = 0.1},
    ['medium-ship-wreck'] = {min = 0.1, max = 0.1},
    ['crash-site-spaceship-wreck-small-1'] = {min = 0.1, max = 0.1},
    ['crash-site-spaceship-wreck-small-2'] = {min = 0.1, max = 0.1},
    ['crash-site-spaceship-wreck-small-3'] = {min = 0.1, max = 0.1},
    ['crash-site-spaceship-wreck-small-4'] = {min = 0.1, max = 0.1},
    ['crash-site-spaceship-wreck-small-5'] = {min = 0.1, max = 0.1},
    ['crash-site-spaceship-wreck-small-6'] = {min = 0.1, max = 0.1},
    ['big-ship-wreck-1'] = {min = 0.2, max = 0.4},
    ['big-ship-wreck-2'] = {min = 0.2, max = 0.4},
    ['big-ship-wreck-3'] = {min = 0.2, max = 0.4},
    ['crash-site-chest-1'] = {min = 0.1, max = 0.2},
    ['crash-site-chest-2'] = {min = 0.1, max = 0.2},
    ['crash-site-spaceship-wreck-medium-1'] = {min = 0.1, max = 0.2},
    ['crash-site-spaceship-wreck-medium-2'] = {min = 0.1, max = 0.2},
    ['crash-site-spaceship-wreck-medium-3'] = {min = 0.1, max = 0.2},
    ['crash-site-spaceship-wreck-big-1'] = {min = 0.2, max = 0.4},
    ['crash-site-spaceship-wreck-big-2'] = {min = 0.2, max = 0.4},
    ['crash-site-spaceship'] = {min = 0.5, max = 2.5},
    ['explosion'] = {min = 0.1, max = 0.1},
    ['big-explosion'] = {min = 0.2, max = 0.2},
    ['big-artillery-explosion'] = {min = 0.5, max = 0.5},
    ['market'] = {min = 10, max = 50}
}

function Public.market_scent()
    local ffatable = Table.get_table()
    local town_centers = ffatable.town_centers
    if town_centers == nil then
        return
    end
    for _, town_center in pairs(town_centers) do
        local market = town_center.market
        local pollution = pollution_index['market']
        local amount = math_random(pollution.min, pollution.max)
        market.surface.pollute(market.position, amount)
    end
end

function Public.explosion(position, surface, animation)
    local pollution = pollution_index[animation]
    if pollution == nil then
        return
    end
    local amount = math_random(pollution.min, pollution.max)
    surface.pollute(position, amount)
end

local function on_player_mined_entity(event)
    local entity = event.entity
    if Scrap.is_scrap(entity) == true then
        local pollution = pollution_index[entity.name]
        local amount = math_random(pollution.min, pollution.max)
        entity.surface.pollute(entity.position, amount)
    end
end

local function on_entity_damaged(event)
    local entity = event.entity
    if not entity.valid then
        return
    end
    local pollution = pollution_index[entity.name]
    if pollution == nil then
        return
    end
    local amount = math_random(pollution.min, pollution.max)
    entity.surface.pollute(entity.position, amount)
end

local function on_entity_died(event)
    local entity = event.entity
    if not entity.valid then
        return
    end
    local pollution = pollution_index[entity.name]
    if pollution == nil then
        return
    end
    local amount = math_random(pollution.min, pollution.max) * 10
    entity.surface.pollute(entity.position, amount)
end

local Event = require 'utils.event'
Event.add(defines.events.on_player_mined_entity, on_player_mined_entity)
Event.add(defines.events.on_entity_damaged, on_entity_damaged)
Event.add(defines.events.on_entity_died, on_entity_died)

return Public