local alpha_order = {'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm'}
local base_battery_energy = 5
local base_battery_flow = 300
local base_solar_energy = 60
local graphics_location = '__PHI-EN__/graphics/'
local items = {'accumulator', 'solar-panel'}

-- entity
local function EE(source, tier)
    local item = table.deepcopy(data.raw[source][source])
    item.name = source .. '-mk' .. tier
    item.minable.result = source .. '-mk' .. tier
    item.max_health = 200 * (2 ^ (tier - 1))
    item.picture.layers[1].filename = graphics_location .. source .. '-e.png'
    item.picture.layers[1].hr_version.filename = graphics_location .. source ..'-eh.png'
    item.icon = graphics_location .. source .. '-i.png'
    item.icon_size = 64
    item.icon_mipmaps = 4

    if (source == 'accumulator') then
        item.energy_source.buffer_capacity = (base_battery_energy * 4 ^ (tier - 1)) .. 'MJ'
        item.energy_source.input_flow_limit = (base_battery_flow * (4 ^ (tier - 1))) .. 'kW'
        item.energy_source.output_flow_limit = (base_battery_flow * (4 ^ (tier - 1))) .. 'kW'
        item.charge_animation.layers[1].layers[1].filename = item.picture.layers[1].filename
        item.charge_animation.layers[1].layers[1].tint = {r = 1, g = 1, b = 1, a = 1}
        item.charge_animation.layers[1].layers[1].hr_version.filename = item.picture.layers[1].hr_version.filename
        item.charge_animation.layers[1].layers[1].hr_version.tint = {r = 1, g = 1, b = 1, a = 1}
        item.discharge_animation.layers[1].layers[1].filename = item.picture.layers[1].filename
        item.discharge_animation.layers[1].layers[1].tint = {r = 1, g = 1, b = 1, a = 1}
        item.discharge_animation.layers[1].layers[1].hr_version.filename = item.picture.layers[1].hr_version.filename
        item.discharge_animation.layers[1].layers[1].hr_version.tint = {r = 1, g = 1, b = 1, a = 1}
    else
        item.production = (base_solar_energy * (4 ^ (tier - 1))) .. 'kW'
    end
    
    if (tier <= 7) then
        item.next_upgrade = source .. '-mk' .. (tier + 1)
    end
    
    data:extend({item})
end

-- item
local function EI(source, tier)
    local item = table.deepcopy(data.raw.item[source])
    item.name = source .. '-mk' .. tier
    item.place_result = source .. '-mk' .. tier
    item.max_health = 200 * (2 ^ (tier - 1))
    item.subgroup = 'energy'
    item.stack_size = 50
    item.default_request_amount = 50
    item.icons = {{icon = graphics_location .. source .. '-i.png', icon_mipmaps = 4, icon_size = 64}}

    if (source == 'accumulator') then
        item.order = 'd[' .. source .. ']-a' .. tier .. '[' .. source .. '-mk' .. tier .. ']'
    else
        item.order = 'e[' .. source .. ']-a' .. tier .. '[' .. source .. '-mk' .. tier .. ']'
    end

    data:extend({item})
end

-- recipe
local function ER(source, tier)
    local na = source

    if (tier >= 3) then
        na = na .. '-mk' .. (tier - 1)
    end

    data:extend({{
        type = 'recipe',
        name = source .. '-mk' .. tier,
        energy_required = 2,
        enabled = false,
        ingredients = {{na, 4}},
        result = source .. '-mk' .. tier,
    }})
end

-- technology
local function ET(tier)
    if (tier == 2) then
        local prereq = {'solar-energy', 'advanced-electronics', 'electric-energy-accumulators'}
    else
        local prereq = {'compound-energy-' .. (tier - 2)}
    end

    data:extend({{
        type = 'technology',
        name = 'compound-energy-' .. (tier - 1),
        icon_size = 256,
        icon = graphics_location .. 'solar-energy' .. '-t.png',
        effects = {
            {
                type = 'unlock-recipe',
                recipe = 'solar-panel-mk' .. tier
            },
            {
                type = 'unlock-recipe',
                recipe = 'accumulator-mk' .. tier
            }
        },
        prerequisites = prereq,
        unit = {
            count = 200 * (2 ^ (tier - 1)),
            ingredients = {
                {'automation-science-pack', 1},
                {'logistic-science-pack', 1}
            },
            time = 60
        },
        order = 'a-h-' .. alpha_order[tier + 1]
    }})
end

for i=1, 2, 1 do
    for j=2, 8, 1 do
        EE(items[i], j)
        EI(items[i], j)
        ER(items[i], j)
        ET(j)
    end
end
