--[[-- Gui Module - Autofill
    - Adds a button to enable Autofill
    @gui Autofill
    @alias autofill
]]

local Storage = require("modules/exp_util/storage")
local FlyingText = require("modules/exp_util/flying_text")
local Gui = require("modules/exp_gui")
local Roles = require("modules.exp_legacy.expcore.roles")
local config = require("modules.exp_legacy.config.gui.autofill") -- @dep config.gui.autofill
local Event = require("modules/exp_legacy/utils/event") -- @dep utils.event

--- Table that stores if autofill is enabled or not
local autofill_player_settings = {}
Storage.register(autofill_player_settings, function(tbl)
    autofill_player_settings = tbl
end)

local autofill_container

local function rich_img(type, value)
    return "[img=" .. type .. "/" .. value .. "]"
end

--- Toggle entity section visibility
-- @element toggle_item_button
local toggle_section = Gui.element("autofill_toggle_section")
    :draw{
        type = "sprite-button",
        sprite = "utility/expand",
        tooltip = { "autofill.toggle-section-tooltip" },
        style = "frame_action_button",
        name = Gui.property_from_name,
    }
    :style(Gui.styles.sprite{
        size = 20
    })
    :on_click(function(def, player, element)
        local header_flow = assert(element.parent)
        local flow_name = header_flow.caption
        local flow = header_flow.parent.parent[flow_name]
        if Gui.toggle_visible_state(flow) then
            element.sprite = "utility/collapse"
            element.tooltip = { "autofill.toggle-section-collapse-tooltip" }
        else
            element.sprite = "utility/expand"
            element.tooltip = { "autofill.toggle-section-tooltip" }
        end
    end)

--- Toggle enitity button, used for toggling autofill for the specific entity
-- All entity autofill settings will be ignored if its disabled
-- @element entity_toggle
local entity_toggle = Gui.element("entity_toggle")
    :draw(function(_, parent, entity_name)
        return parent.add{
            type = "sprite-button",
            sprite = "utility/confirm_slot",
            tooltip = { "autofill.toggle-entity-tooltip", rich_img("item", entity_name) },
            style = "shortcut_bar_button_green",
        }
    end)
    :style(Gui.styles.sprite{
        size = 22
    })
    :on_click(function(def, player, element)
        local entity_name = string.match(element.parent.parent.name, "(.*)%-header")
        if not autofill_player_settings[player.name] then return end
        local setting = autofill_player_settings[player.name][entity_name]
        if not setting then return end
        if setting.enabled then
            setting.enabled = false
            element.sprite = "utility/close_black"
            element.style = "shortcut_bar_button_red"
        else
            setting.enabled = true
            element.sprite = "utility/confirm_slot"
            element.style = "shortcut_bar_button_green"
        end
        -- Correct the button size
        local style = element.style
        style.padding = -2
        style.height = 22
        style.width = 22
    end)

--- Draw a section header and main scroll
-- @element autofill_section_container
local section = Gui.element("autofill_section")
    :draw(function(def, parent, section_name, table_size)
        -- Draw the header for the section
        local header = Gui.elements.header(parent, {
            name = section_name .. "-header",
            caption = { "autofill.toggle-section-caption", rich_img("item", section_name), { "entity-name." .. section_name } },
            tooltip = { "autofill.toggle-section-tooltip" },
            label_name = "label",
        })

        def:link_element(header.parent.label)

        -- Right aligned button to toggle the section
        header.caption = section_name
        entity_toggle(header, section_name)
        toggle_section(header)

        local section_table = parent.add{
            type = "table",
            name = section_name,
            column_count = table_size,
        }

        section_table.visible = false

        return def:unlink_element(section_table)
    end)
    :on_click(function(def, player, element, event)
        event.element = element.parent.flow[toggle_section.name]
        toggle_section:raise_event(event)
    end)

--- Toggle item button, used for toggling autofill for the specific item
-- @element toggle_item_button
local toggle_item_button = Gui.element("toggle_item_button")
    :draw(function(_, parent, item)
        return parent.add{
            type = "sprite-button",
            sprite = "item/" .. item.name,
            tooltip = { "autofill.toggle-tooltip", rich_img("item", item.name), item.category },
            style = "shortcut_bar_button_red",
        }
    end)
    :style(Gui.styles.sprite{
        size = 32,
        right_margin = -3,
    })
    :on_click(function(def, player, element)
        local item_name = element.parent.tooltip
        local entity_name = element.parent.parent.parent.name
        if not autofill_player_settings[player.name] then return end
        local setting = autofill_player_settings[player.name][entity_name]
        if not setting then return end
        local item = setting.items[item_name]
        if not item then return end
        if item.enabled then
            item.enabled = false
            element.style = "shortcut_bar_button_red"
        else
            item.enabled = true
            element.style = "shortcut_bar_button_green"
        end
        -- Correct the button size
        local style = element.style
        style.right_margin = -3
        style.padding = -2
        style.height = 32
        style.width = 32
    end)

--- Amount text field for a autofill item
-- @element amount_textfield
local amount_textfield = Gui.element("amount_textfield")
    :draw(function(_, parent, item)
        return parent.add{
            type = "textfield",
            text = item.amount,
            tooltip = { "autofill.amount-tooltip", item.category },
            clear_and_focus_on_right_click = true,
            numeric = true,
            allow_decimal = false,
            allow_negative = false,
        }
    end)
    :style{
        maximal_width = 40,
        height = 31,
        padding = -2,
    }
    :on_text_changed(function(def, player, element)
        local value = tonumber(element.text)
        if not value then value = 0 end
        local clamped = math.clamp(value, 0, 1000)
        local item_name = element.parent.tooltip
        local entity_name = element.parent.parent.parent.name
        if not autofill_player_settings[player.name] then return end
        local setting = autofill_player_settings[player.name][entity_name]
        if not setting then return end
        local item = setting.items[item_name]
        if not item then return end
        item.amount = clamped
        if clamped ~= value then
            element.text = tostring(clamped)
            player.print{ "autofill.invalid", item.amount, rich_img("item", item.name), rich_img("entity", entity_name) }
            return
        end
    end)

--- Autofill setting, contains a button and a textbox
-- @element add_autofill_setting
local add_autofill_setting = Gui.element("add_autofill_setting")
    :draw(function(_, parent, item)
        local toggle_flow = parent.add{ type = "flow", name = "toggle-setting-" .. item.name, tooltip = item.name }
        local amount_flow = parent.add{ type = "flow", name = "amount-setting-" .. item.name, tooltip = item.name }
        toggle_flow.style.padding = 0
        amount_flow.style.padding = 0
        toggle_item_button(toggle_flow, item)
        amount_textfield(amount_flow, item)
    end)

--- Autofill setting empty, contains filler button and textfield gui elements
-- @element add_empty_autofill_setting
local add_empty_autofill_setting = Gui.element("add_empty_autofill_setting")
    :draw(function(_, parent)
        local toggle_element = parent.add{
            type = "sprite-button",
        }
        toggle_element.style.right_margin = -3
        toggle_element.style.width = 32
        toggle_element.style.height = 32
        toggle_element.enabled = false
        local amount_element = parent.add{
            type = "textfield",
        }
        amount_element.style.maximal_width = 40
        amount_element.style.height = 31
        amount_element.style.padding = -2
        amount_element.enabled = false
    end)

--- Main gui container for the left flow
-- @element autofill_container
autofill_container = Gui.element("autofill_container")
    :draw(function(def, parent)
        -- Draw the internal container
        local container = Gui.elements.container(parent)
        -- Draw the scroll container
        local scroll_table = Gui.elements.scroll_table(container, 400, 1, "autofill-scroll-table")
        -- Set the scroll panel to always show the scrollbar (not doing this will result in a changing gui size)
        scroll_table.parent.vertical_scroll_policy = "always"
        -- Scroll panel has by default padding
        scroll_table.parent.style.padding = 0
        -- Remove the default gap that is added in a table between elements
        scroll_table.style.vertical_spacing = 0
        -- Center the first column in the table
        scroll_table.style.column_alignments[1] = "center"
        -- Loop over each default entity config
        for _, setting in pairs(config.default_entities) do
            local table_sizes = {}
            local tables = {}
            -- Draw a section for the element
            local entity_table = section(scroll_table, setting.entity, 3)
            -- Add some padding around the table
            entity_table.style.padding = 3
            -- Make sure each column is alignment top center
            entity_table.style.column_alignments[1] = "top-center"
            entity_table.style.column_alignments[2] = "top-center"
            entity_table.style.column_alignments[3] = "top-center"
            -- Loop over each item category
            for _, category in pairs(config.categories) do
                if not table_sizes[category] then table_sizes[category] = 0 end
                -- Draw table
                local category_table = entity_table.add{
                    type = "table",
                    name = category .. "-category",
                    column_count = 2,
                }
                -- Add padding between each item
                category_table.style.vertical_spacing = 1
                tables[category] = category_table
                -- Add item autofill setting gui elements to the table
                for _, item in pairs(setting.items) do
                    if item.category == category then
                        add_autofill_setting(category_table, item)
                        table_sizes[category] = table_sizes[category] + 1
                    end
                end
            end

            -- Add empty gui elements for the categories with less items than the other categories
            local t = table.get_values(table_sizes)
            table.sort(t)
            local biggest = t[#t]
            for category, size in pairs(table_sizes) do
                for i = biggest - size, 1, -1 do
                    add_empty_autofill_setting(tables[category])
                end
            end
        end

        -- Return the external container
        return container.parent
    end)

--- Add the element to the left flow with a toolbar button
Gui.add_left_element(autofill_container, false)
Gui.toolbar.create_button{
    name = "autofill_toggle",
    left_element = autofill_container,
    sprite = config.icon,
    tooltip = { "autofill.main-tooltip" },
    visible = function(player, element)
        return Roles.player_allowed(player, "gui/autofill")
    end
}

--- When a player is created make sure they have the default autofill settings
Event.add(defines.events.on_player_created, function(event)
    local player = game.players[event.player_index]
    if not autofill_player_settings[player.name] then
        autofill_player_settings[player.name] = table.deep_copy(config.default_entities)
    end
end)

local function entity_build(event)
    -- Check if player exists
    local player = game.players[event.player_index]
    if not player then
        return
    end
    -- Check if the entity is in the config and enabled
    local entity = event.entity

    -- Check if player has settings
    if not autofill_player_settings[player.name] then return end

    local entity_settings = autofill_player_settings[player.name][entity.name]
    -- Check if autofill for the entity is enabled
    if not entity_settings then return end
    if not entity_settings.enabled then return end

    -- Get the inventory of the player
    local player_inventory = player.get_main_inventory() --- @cast player_inventory -nil

    local offset = { x = 0, y = 0 }
    -- Loop over all possible items to insert into the entity
    for _, item in pairs(entity_settings.items) do
        -- Check if the item is enabled or goto next item
        if not item.enabled then goto end_item end

        -- Get the inventory of the entity or goto next item
        local entity_inventory = entity.get_inventory(item.inv)
        if not entity_inventory then goto end_item end

        local preferred_amount = item.amount
        local item_amount = player_inventory.get_item_count(item.name)
        if item_amount ~= 0 then
            local inserted
            local color = { r = 0, g = 255, b = 0, a = 255 }
            if item_amount >= preferred_amount then
                -- Can item be inserted? no, goto next item!
                if not entity_inventory.can_insert{ name = item.name, count = preferred_amount } then
                    goto end_item
                end
                inserted = entity_inventory.insert{ name = item.name, count = preferred_amount }
            else
                inserted = entity_inventory.insert{ name = item.name, count = item_amount }
                color = { r = 255, g = 165, b = 0, a = 255 }
            end
            player_inventory.remove{ name = item.name, count = inserted }
            FlyingText.create_above_entity{
                target_entity = entity,
                text = { "autofill.inserted", inserted, rich_img("item", item.name), rich_img("entity", entity.name) },
                offset = offset,
                player = player,
                color = color,
            }
            offset.y = offset.y - 0.33
        end
        ::end_item::
    end
end

Event.add(defines.events.on_built_entity, entity_build)
