--[[-- info
    Provides the ability to purchase items from the market.
]]

-- dependencies
local Event = require 'utils.event'
local Token = require 'utils.global_token'
local Task = require 'utils.Task'
local Gui = require 'utils.gui'
local Debug = require 'map_gen.Diggy.Debug'
local Template = require 'map_gen.Diggy.Template'
local Global = require 'utils.global'
local Game = require 'utils.game'
local MarketUnlockables = require 'map_gen.Diggy.MarketUnlockables'
local calculate_level = MarketUnlockables.calculate_level
local insert = table.insert
local max = math.max

-- this
local MarketExchange = {}

local config = {}

local stone_tracker = {
    stone_sent_to_surface = 0,
    previous_stone_sent_to_surface = 0,
    current_level = 0,
}

local stone_collecting = {
    initial_value = 0,
    active_modifier = 0,
    research_modifier = 0,
    market_modifier = 0,
}

local mining_efficiency = {
    active_modifier = 0,
    research_modifier = 0,
    market_modifier = 0,
}

local inventory_slots = {
    active_modifier = 0,
    research_modifier = 0,
    market_modifier = 0,
}

Global.register({
    stone_collecting = stone_collecting,
    stone_tracker = stone_tracker,
    mining_efficiency = mining_efficiency,
    inventory_slots = inventory_slots,
}, function(tbl)
    stone_collecting = tbl.stone_collecting
    stone_tracker = tbl.stone_tracker
    mining_efficiency = tbl.mining_efficiency
    inventory_slots = tbl.inventory_slots
end)

local function send_stone_to_surface(total)
    stone_tracker.previous_stone_sent_to_surface = stone_tracker.stone_sent_to_surface
    stone_tracker.stone_sent_to_surface = stone_tracker.stone_sent_to_surface + total
end

local on_market_timeout_finished = Token.register(function(params)
    Template.market(params.surface, params.position, params.player_force, {})

    local tiles = {}
    for _, position in pairs(params.void_chest_tiles) do
        insert(tiles, {name = 'tutorial-grid', position = position})
    end

    params.surface.set_tiles(tiles)
end)

local function update_mining_speed(force)
    -- remove the current buff
    local old_modifier = force.manual_mining_speed_modifier - mining_efficiency.active_modifier

    -- update the active modifier
    mining_efficiency.active_modifier = mining_efficiency.research_modifier + mining_efficiency.market_modifier

    -- add the new active modifier to the non-buffed modifier
    force.manual_mining_speed_modifier = old_modifier + mining_efficiency.active_modifier
end

local function update_inventory_slots(force)
    -- remove the current buff
    local old_modifier = force.character_inventory_slots_bonus - inventory_slots.active_modifier

    -- update the active modifier
    inventory_slots.active_modifier = inventory_slots.research_modifier + inventory_slots.market_modifier

    -- add the new active modifier to the non-buffed modifier
    force.character_inventory_slots_bonus = old_modifier + inventory_slots.active_modifier
end

local function update_stone_collecting()
    -- remove the current buff
    local old_modifier = stone_collecting.initial_value - stone_collecting.active_modifier

    -- update the active modifier
    stone_collecting.active_modifier = stone_collecting.research_modifier + stone_collecting.market_modifier

    -- add the new active modifier to the non-buffed modifier
    stone_collecting.initial_value = old_modifier + stone_collecting.active_modifier
end


--Handles the updating of market items when unlocked, also handles the buffs
local function update_market_contents(market)
    if (stone_tracker.previous_stone_sent_to_surface == stone_tracker.stone_sent_to_surface) then
        return
    end

    local should_update_mining_speed = false
    local should_update_inventory_slots = false
    local should_update_stone_collecting = false
    local add_market_item
    local old_level = stone_tracker.current_level
    local print = game.print

    for _, unlockable in pairs(config.unlockables) do
        local stone_unlock = calculate_level(unlockable.level)
        local is_in_range = stone_unlock > stone_tracker.previous_stone_sent_to_surface and stone_unlock <= stone_tracker.stone_sent_to_surface
        
        if (is_in_range and stone_tracker.current_level == old_level) then
            while (calculate_level(stone_tracker.current_level) < stone_tracker.stone_sent_to_surface) do
                if (calculate_level(stone_tracker.current_level+1) <= stone_tracker.stone_sent_to_surface) then
                    stone_tracker.current_level = stone_tracker.current_level + 1
                else
                    break
                end
            end
        end

        -- only add the item to the market if it's between the old and new stone range
        if (is_in_range and unlockable.type == 'market') then
            add_market_item = add_market_item or market.add_market_item

            local name = unlockable.prototype.name
            local price = unlockable.prototype.price
            print('Mining Foreman: New wares at the market! Come get your ' .. name .. ' for only ' .. price .. ' ' .. config.currency_item .. '!')

            add_market_item({
                price = {{config.currency_item, price}},
                offer = {type = 'give-item', item = name, count = 1}
            })
        end
    end
    
    if (old_level < stone_tracker.current_level) then
        for _, buffs in pairs(config.buffs) do
            if (buffs.prototype.name == 'mining_speed') then
                local value = buffs.prototype.value
                print('Mining Foreman: Increased mining speed by ' .. value .. '%!')
                should_update_mining_speed = true
                mining_efficiency.market_modifier = mining_efficiency.market_modifier + (value / 100)
            elseif (buffs.prototype.name == 'inventory_slot') then
                local value = buffs.prototype.value
                print('Mining Foreman: Increased inventory slots by ' .. value .. '!')
                should_update_inventory_slots = true
                inventory_slots.market_modifier = inventory_slots.market_modifier + value
            elseif (buffs.prototype.name == 'stone_automation') then
                local value = buffs.prototype.value
                if (stone_tracker.current_level == 1) then
                    print('Mining Foreman: We can now automatically send stone to the surface from a chest below the market!')
                else
                    print('Mining Foreman: We can now automatically send ' .. value .. ' more stones!')
                end
                should_update_stone_collecting = true
                stone_collecting.market_modifier = stone_collecting.market_modifier + value
            end
        end
    end
    
    local force

    if (should_update_mining_speed) then
        force = force or game.forces.player
        update_mining_speed(force)
    end

    if (should_update_inventory_slots) then
        force = force or game.forces.player
        update_inventory_slots(force)
    end

    if (should_update_stone_collecting) then
        update_stone_collecting()
    end
end

local function on_research_finished(event)
    local force = game.forces.player
    local current_modifier = mining_efficiency.research_modifier
    local new_modifier = force.mining_drill_productivity_bonus * config.mining_speed_productivity_multiplier * 0.5

    if (current_modifier == new_modifier) then
        -- something else was researched
        return
    end

    mining_efficiency.research_modifier = new_modifier
    inventory_slots.research_modifier = force.mining_drill_productivity_bonus * 50 -- 1 per level
    stone_collecting.research_modifier = force.mining_drill_productivity_bonus * 1250 -- 25 per level

    update_inventory_slots(force)
    update_mining_speed(force)
    update_stone_collecting()
end

local function comma_value(n) -- credit http://richard.warburton.it
    local left,num,right = string.match(n, '^([^%d]*%d)(%d*)(.-)$')
    return left .. (num:reverse():gsub('(%d%d%d)', '%1,'):reverse()) .. right
end

local function redraw_title(data)
    data.frame.caption = comma_value(stone_tracker.stone_sent_to_surface) .. ' ' .. config.currency_item .. ' sent to the surface'
end

local function get_data(unlocks, stone, type)
    local result = {}

    for _, data in pairs(unlocks) do
        if calculate_level(data.level) == stone and data.type == type then
            insert(result, data)
        end
    end

    return result
end

local tag_label_stone = Gui.uid_name()
local tag_label_buff = Gui.uid_name()
local tag_label_item = Gui.uid_name()

local function apply_heading_style(style, width)
    style.font = 'default-bold'
    style.width = width
end

local function redraw_heading(data, header)
    local head_condition = (header == 1)
    local frame = (head_condition) and data.market_list_heading or data.buff_list_heading
    local header_caption = (head_condition) and 'Reward Item' or 'Reward Buff'
    Gui.clear(frame)

    local heading_table = frame.add({type = 'table', column_count = 2})
    apply_heading_style(heading_table.add({type = 'label', name = tag_label_stone, caption = 'Requirement'}).style, 100)
    apply_heading_style(heading_table.add({type = 'label', name = tag_label_buff, caption = header_caption}).style, 220)
end

local function redraw_progressbar(data)

    local flow = data.market_progressbars
    Gui.clear(flow)

    -- progress bar for next level
    local act_stone = (stone_tracker.current_level ~= 0) and calculate_level(stone_tracker.current_level) or 0
    local next_stone = calculate_level(stone_tracker.current_level+1)

    local range = next_stone - act_stone
    local sent = stone_tracker.stone_sent_to_surface - act_stone
    local percentage = (math.floor((sent / range)*1000))*0.001
    percentage = (percentage < 0) and (percentage*-1) or percentage

    apply_heading_style(flow.add({type = 'label', tooltip = 'Currently at level: ' .. stone_tracker.current_level .. '\nNext level at: ' .. comma_value(next_stone) ..'\nRemaining stone: ' .. comma_value(range - sent), name = 'Diggy.MarketExchange.Frame.Progress.Level', caption = 'Progress to next level:'}).style)
    local level_progressbar = flow.add({type = 'progressbar', tooltip = percentage * 100 .. '% stone to next level'})
    level_progressbar.style.width = 350
    level_progressbar.value = percentage
end

local function redraw_table(data)
    local market_scroll_pane = data.market_scroll_pane
    Gui.clear(market_scroll_pane)

    local buffs = {}
    local items = {}
    local last_stone = 0
    local number_of_rows = 0
    local row = {}

    -- create the progress bars in the window
    redraw_progressbar(data)

    -- create table headings
    redraw_heading(data, 1)

    -- create table
    for i = 1, #config.unlockables do
        if calculate_level(config.unlockables[i].level) ~= last_stone then

            -- get items and buffs for each stone value
            items = get_data(config.unlockables, calculate_level(config.unlockables[i].level), 'market')

            -- get number of rows
            number_of_rows = max(#buffs, #items)

            -- loop through buffs and items for number of rows
            for j = 1, number_of_rows do
                local result = {}
                local item = items[j]
                local level = item.level

                -- 1st column
                result[6] = calculate_level(level)
                result[1] = 'Level ' ..level
                -- 3rd column
                if items[j] ~= nil then
                    result[3] = '+ ' .. item.prototype.name
                else
                    result[3] = ''
                end
                -- indicator to stop print stone number
                if j > 1 then
                    result[4] = true
                else
                    result[4] = false
                end
                -- indicator to draw horizontal line
                if j == number_of_rows then
                    result[5] = true
                else
                    result[5] = false
                end

                insert(row, result)
            end
        end

        -- save lastStone
        last_stone = calculate_level(config.unlockables[i].level)
    end

    -- print table
    for _, unlockable in pairs(row) do
        local is_unlocked = unlockable[6] <= stone_tracker.stone_sent_to_surface
        local list = market_scroll_pane.add {type = 'table', column_count = 2 }

        list.style.horizontal_spacing = 16

        local caption = ''
        if unlockable[4] ~= true then
            caption = unlockable[1]
        else
            caption = ''
        end
        local tag_stone = list.add {type = 'label', name = tag_label_stone, caption = caption}
        tag_stone.style.minimal_width = 100

        local tag_items = list.add {type = 'label', name = tag_label_item, caption = unlockable[3]}
        tag_items.style.minimal_width = 220

        -- draw horizontal line
        if unlockable[5] == true then
            list.draw_horizontal_line_after_headers = true
        end

        if (is_unlocked) then
            tag_stone.style.font_color = {r = 1, g = 1, b = 1 }
            tag_items.style.font_color = {r = 1, g = 1, b = 1 }
        else
            tag_stone.style.font_color = {r = 0.5, g = 0.5, b = 0.5 }
            tag_items.style.font_color = {r = 0.5, g = 0.5, b = 0.5 }
        end
    end
end

local function redraw_buff(data) --! Almost equals to the redraw_table() function !
    local buff_scroll_pane = data.buff_scroll_pane
    Gui.clear(buff_scroll_pane)

    local buffs = {}
    local number_of_rows = 0
    local row = {}
    
    for i = 1, #config.buffs do
        -- get items and buffs for each stone value
        buffs = config.buffs
        
        local result = {}

        -- 1st column
        result[1] = 'All levels'

        -- 2nd column
        if buffs[i].prototype.name == 'mining_speed' then
            result[2] = '+ '.. buffs[i].prototype.value .. '% mining speed'
        elseif buffs[i].prototype.name == 'inventory_slot' then
            if buffs[i].prototype.value > 1 then
                result[2] = '+ '.. buffs[i].prototype.value .. ' inventory slots'
            else
                result[2] = '+ '.. buffs[i].prototype.value .. ' inventory slot'
            end
        elseif buffs[i].prototype.name == 'stone_automation' then
            result[2] = '+ '.. buffs[i].prototype.value .. ' stones automatically sent'
        else
            result[2] = 'Description missing: unknown buff. Please contact admin'
        end
        
        -- 3rd column
        result[3] = ''
        -- indicator to stop print level number
        if i > 1 then
            result[4] = true
        else
            result[4] = false
        end
        insert(row, result)
    end    
    for _, unlockable in pairs(row) do
        local list = buff_scroll_pane.add {type = 'table', column_count = 2 }
        list.style.horizontal_spacing = 16

        local caption = ''
        if unlockable[4] ~= true then
            caption = unlockable[1]
        else
            caption = ''
        end
        local tag_stone = list.add {type = 'label', name = buff_tag_label_stone, caption = caption}
        tag_stone.style.minimal_width = 100

        local tag_buffs = list.add {type = 'label', name = buff_tag_label_buff, caption = unlockable[2]}
        tag_buffs.style.minimal_width = 220

        tag_stone.style.font_color = {r = 1, g = 1, b = 1 }
        tag_buffs.style.font_color = {r = 1, g = 1, b = 1 }
    end
end

local function on_market_item_purchased(event)
    if (1 ~= event.offer_index) then
        return
    end

    local sum = config.stone_to_surface_amount * event.count
    Game.print_player_floating_text(event.player_index, '-' .. sum .. ' stone', {r = 0.6, g = 0.55, b = 0.42})

    send_stone_to_surface(sum)
    update_market_contents(event.market)
end

local function on_placed_entity(event)
    local market = event.entity
    if ('market' ~= market.name) then
        return
    end

    market.add_market_item({
        price = {{config.currency_item, 50}},
        offer = {type = 'nothing', effect_description = 'Send ' .. config.stone_to_surface_amount .. ' ' .. config.currency_item .. ' to the surface. To see the overall progress and rewards, click the market button in the menu.'}
    })

    update_market_contents(market)
end

function MarketExchange.get_extra_map_info(config)
    return 'Market Exchange, trade your stone or send it to the surface'
end

local function toggle(event)
    local player = event.player
    local center = player.gui.center
    local frame = center['Diggy.MarketExchange.Frame']

    if (frame) then
        Gui.destroy(frame)
        return
    end

    frame = center.add({name = 'Diggy.MarketExchange.Frame', type = 'frame', direction = 'vertical'})

    local market_progressbars = frame.add({type = 'flow', direction = 'vertical'})
    local market_list_heading = frame.add({type = 'flow', direction = 'horizontal'})

    local market_scroll_pane = frame.add({type = 'scroll-pane'})
    market_scroll_pane.style.maximal_height = 300
    
    local buff_list_heading = frame.add({type = 'flow', direction = 'horizontal'})
    
    local buff_scroll_pane = frame.add({type = 'scroll-pane'})
    buff_scroll_pane.style.maximal_height = 100

    frame.add({ type = 'button', name = 'Diggy.MarketExchange.Button', caption = 'Close'})

    local data = {
        frame = frame,
        market_progressbars = market_progressbars,
        market_list_heading = market_list_heading,
        market_scroll_pane = market_scroll_pane,
        buff_list_heading = buff_list_heading,
        buff_scroll_pane = buff_scroll_pane,
    }

    redraw_title(data)
    redraw_table(data)
    
    redraw_heading(data, 2)
    redraw_buff(data)

    Gui.set_data(frame, data)

    player.opened = frame
end

local function on_player_created(event)
    Game.get_player_by_index(event.player_index).gui.top.add({
        name = 'Diggy.MarketExchange.Button',
        type = 'sprite-button',
        sprite = 'entity/market',
    })
end

Gui.on_click('Diggy.MarketExchange.Button', toggle)
Gui.on_custom_close('Diggy.MarketExchange.Frame', function (event)
    event.element.destroy()
end)

function MarketExchange.on_init()
    Task.set_timeout_in_ticks(50, on_market_timeout_finished, {
        surface = game.surfaces.nauvis,
        position = config.market_spawn_position,
        player_force = game.forces.player,
        void_chest_tiles = config.void_chest_tiles,
    })

    update_mining_speed(game.forces.player)
end

--[[--
    Registers all event handlers.
]]
function MarketExchange.register(cfg)
    config = cfg

    Event.add(defines.events.on_research_finished, on_research_finished)
    Event.add(defines.events.on_market_item_purchased, on_market_item_purchased)
    Event.add(Template.events.on_placed_entity, on_placed_entity)
    Event.add(defines.events.on_player_created, on_player_created)

    local x_min
    local y_min
    local x_max
    local y_max

    for _, position in pairs(config.void_chest_tiles) do
        local x = position.x
        local y = position.y

        if (nil == x_min or x < x_min) then
            x_min = x
        end

        if (nil == x_max or x > x_max) then
            x_max = x
        end

        if (nil == y_min or y < y_min) then
            y_min = y
        end

        if (nil == y_max or y > y_max) then
            y_max = y
        end
    end

    local area = {{x_min, y_min}, {x_max + 1, y_max + 1}}
    local message_x = (x_max + x_min) * 0.5
    local message_y = (y_max + y_min) * 0.5

    Event.on_nth_tick(config.void_chest_frequency, function ()
        local send_to_surface = 0
        local surface = game.surfaces.nauvis
        local find_entities_filtered = surface.find_entities_filtered
        local chests = find_entities_filtered({area = area, type = {'container', 'logistic-container'}})
        local to_fetch = stone_collecting.active_modifier

        for _, chest in pairs(chests) do
            local chest_contents = chest.get_inventory(defines.inventory.chest)
            local stone_in_chest = chest_contents.get_item_count(config.currency_item)
            local delta = to_fetch

            if (stone_in_chest < delta) then
                delta = stone_in_chest
            end

            if (delta > 0) then
                chest_contents.remove({name = config.currency_item, count = delta})
                send_to_surface = send_to_surface + delta
            end
        end

        if (send_to_surface == 0) then
            if (0 == to_fetch) then
                return
            end

            local message = 'Missing chests below market'
            if (#chests > 0) then
                message = 'No stone in chests found'
            end

            Game.print_floating_text(surface, {x = message_x, y = message_y}, message, { r = 220, g = 100, b = 50})
            return
        end

        local markets = find_entities_filtered({name = 'market', position = config.market_spawn_position, limit = 1})

        if (#markets == 0) then
            Debug.print_position(config.market_spawn_position, 'Unable to find a market')
            return
        end

        local message = send_to_surface .. ' stone sent to the surface'

        Game.print_floating_text(surface, {x = message_x, y = message_y}, message, { r = 0.6, g = 0.55, b = 0.42})

        send_stone_to_surface(send_to_surface)
        update_market_contents(markets[1])
    end)
end

return MarketExchange