--luacheck: ignore
local table_insert = table.insert
local string_find = string.find

local Public = {}

function Public.get_crafting_machines_for_recipe(force_name, recipe)
    local item_whitelist = global.fjei.item_whitelist[force_name]
    local crafting_machines = global.fjei.crafting_machines
    local recipe_category = recipe.category
    local result = {}
    local i = 1
    for _, name in pairs(crafting_machines) do
        if item_whitelist[name] or name == 'character' then
            local crafting_categories = game.entity_prototypes[name].crafting_categories
            for category, _ in pairs(crafting_categories) do
                if recipe_category == category then
                    result[i] = name
                    i = i + 1
                    break
                end
            end
        end
    end
    return result
end

local function set_crafting_machines()
    global.fjei.crafting_machines = {}
    local list = global.fjei.crafting_machines
    local i = 1
    for _, prototype in pairs(game.entity_prototypes) do
        if prototype.crafting_categories then
            list[i] = prototype.name
            i = i + 1
        end
    end
end

local uncommon_recipes = {'barrel', 'void', 'blackhole'}
local function is_uncommon_recipe(recipe_name)
    for _, name in pairs(uncommon_recipes) do
        local a, b = string_find(recipe_name, name, 1, true)
        if a then
            return true
        end
    end
end

local function shift_uncommon_recipe_names(tbl)
    local list_common = {}
    local list_uncommon = {}

    for key, recipe_name in pairs(tbl) do
        if is_uncommon_recipe(recipe_name) then
            table_insert(list_uncommon, recipe_name)
        else
            table_insert(list_common, recipe_name)
        end
    end
    if #list_uncommon == 0 then
        return
    end

    local i = 1
    for _, recipe_name in pairs(list_common) do
        tbl[i] = recipe_name
        i = i + 1
    end
    for _, recipe_name in pairs(list_uncommon) do
        tbl[i] = recipe_name
        i = i + 1
    end
end

local function add_item_list_product(item_list, product_name, recipe_name)
    if not item_list[product_name] then
        item_list[product_name] = {{}, {}}
    end
    table_insert(item_list[product_name][1], recipe_name)
end

local function add_item_list_ingredient(item_list, ingredient_name, recipe_name)
    if not item_list[ingredient_name] then
        item_list[ingredient_name] = {{}, {}}
    end
    table_insert(item_list[ingredient_name][2], recipe_name)
end

local function set_item_list()
    global.fjei.item_list = {}
    local item_list = global.fjei.item_list
    for recipe_name, recipe in pairs(game.recipe_prototypes) do
        for key, product in pairs(recipe.products) do
            add_item_list_product(item_list, product.name, recipe_name)
        end
        for key, ingredient in pairs(recipe.ingredients) do
            add_item_list_ingredient(item_list, ingredient.name, recipe_name)
        end
    end

    for key, v in pairs(item_list) do
        if v[1] then
            if v[1][2] then
                table.sort(
                    v[1],
                    function(a, b)
                        return a < b
                    end
                )
                shift_uncommon_recipe_names(v[1])
            end
        end
        if v[2] then
            if v[2][2] then
                table.sort(
                    v[2],
                    function(a, b)
                        return a < b
                    end
                )
                shift_uncommon_recipe_names(v[2])
            end
        end
    end
end

local function set_sorted_item_list()
    global.fjei.sorted_item_list = {}
    local sorted_item_list = global.fjei.sorted_item_list
    local item_list = global.fjei.item_list
    local item_prototypes = game.item_prototypes
    local fluid_prototypes = game.fluid_prototypes

    local sorted_items = {}
    local i = 1
    for key, value in pairs(item_list) do
        if item_prototypes[key] then
            sorted_items[i] = key
            i = i + 1
        end
    end
    table.sort(
        sorted_items,
        function(a, b)
            return a < b
        end
    )

    local sorted_fluids = {}
    local i = 1
    for key, value in pairs(item_list) do
        if fluid_prototypes[key] then
            sorted_fluids[i] = key
            i = i + 1
        end
    end
    table.sort(
        sorted_fluids,
        function(a, b)
            return a < b
        end
    )

    local i = 1
    for key, name in pairs(sorted_items) do
        sorted_item_list[i] = name
        i = i + 1
    end
    for key, name in pairs(sorted_fluids) do
        sorted_item_list[i] = name
        i = i + 1
    end
end

local function add_recipe_to_whitelist(item_whitelist, recipe)
    for key, product in pairs(recipe.products) do
        item_whitelist[product.name] = true
    end
    for key, ingredient in pairs(recipe.ingredients) do
        item_whitelist[ingredient.name] = true
    end
end

function Public.add_research_to_whitelist(force, effects)
    if not effects then
        return
    end
    local item_whitelist = global.fjei.item_whitelist[force.name]
    local items_have_been_added = false
    for _, effect in pairs(effects) do
        if effect.recipe then
            add_recipe_to_whitelist(item_whitelist, game.recipe_prototypes[effect.recipe])
            items_have_been_added = true
        end
    end
    return items_have_been_added
end

local function set_item_whitelist(force)
    global.fjei.item_whitelist[force.name] = {}
    local item_whitelist = global.fjei.item_whitelist[force.name]

    for key, recipe in pairs(force.recipes) do
        if recipe.enabled and not recipe.hidden then
            add_recipe_to_whitelist(item_whitelist, recipe)
        end
    end

    for key, technology in pairs(force.technologies) do
        if technology.researched then
            Public.add_research_to_whitelist(force, technology.effects)
        end
    end
end

local function set_item_whitelists_for_all_forces()
    global.fjei.item_whitelist = {}
    for _, force in pairs(game.forces) do
        if force.index ~= 2 and force.index ~= 3 then
            set_item_whitelist(force)
        end
    end
end

function Public.set_filtered_list(player)
    local player_data = global.fjei.player_data[player.index]
    player_data.filtered_list = {}
    player_data.active_page = 1
    local filtered_list = player_data.filtered_list
    local active_filter = player_data.active_filter
    local sorted_item_list = global.fjei.sorted_item_list
    local item_whitelist = global.fjei.item_whitelist[player.force.name]

    local i = 1
    for key, name in pairs(sorted_item_list) do
        if item_whitelist[name] then
            if active_filter then
                local a, b = string_find(name, active_filter, 1, true)
                if a then
                    filtered_list[i] = key
                    i = i + 1
                end
            else
                filtered_list[i] = key
                i = i + 1
            end
        end
    end
    player_data.size_of_filtered_list = #player_data.filtered_list
end

function Public.build_tables()
    global.fjei = {}
    global.fjei.player_data = {}
    set_item_list() --creates list of all items as key and two tables for each key containing [1] product recipes and [2] ingredient recipes
    set_sorted_item_list() --creates sorted list of all items in the game for faster searching
    set_crafting_machines() --creates list of available crafting entities
    set_item_whitelists_for_all_forces() --whitelist to only display researched items in the browser for the force
end

return Public