local fov_manager = outfit_animations_fov_manager
local mcm_allow_movement = outfit_animations_mcm.get_config("allow_movement")

local enable_animations = false
local ruck_last_backpack = -1

local is_animation_playing = false
local item_to_equip = nil
local item_to_unequip = nil


function on_game_start()
    RegisterScriptCallback("on_option_change", on_option_change)
    RegisterScriptCallback("actor_on_first_update", actor_on_first_update)
    RegisterScriptCallback("actor_item_to_slot", on_item_to_slot)
    RegisterScriptCallback("actor_item_to_ruck", on_item_to_ruck)
    RegisterScriptCallback("actor_on_item_drop", on_item_to_ruck)
end


function on_option_change()
    mcm_allow_movement = outfit_animations_mcm.get_config("allow_movement")
end


function actor_on_first_update()
    CreateTimeEvent("outfit_animations_backpack", "enable_backpack_animation_delay_te", 3, function()
        ruck_last_backpack = db.actor:item_in_slot(13) and db.actor:item_in_slot(13):id() or -1

        enable_animations = true
        return true
    end)
end


function on_item_to_ruck(obj)
    if IsItem("backpack", nil, obj) and obj:id() == ruck_last_backpack then
        ruck_last_backpack = -1

        if not db.actor:alive() then return end
        if not enable_animations then return end
        if has_alife_info("BAR_ARENA_FIGHT") then return end

        item_to_unequip = get_section_name("outfit_animation_backpack_unequip")
        if not is_animation_playing then 
            is_animation_playing = true
            play_animation_enter()
        end
    end
end


function on_item_to_slot(obj)
    if IsItem("backpack", nil, obj) and obj:id() ~= ruck_last_backpack then
        ruck_last_backpack = obj:id()

        if not db.actor:alive() then return end
        if not enable_animations then return end
        if has_alife_info("BAR_ARENA_FIGHT") then return end

        item_to_equip = get_section_name("outfit_animation_backpack_equip")
        if not is_animation_playing then
            is_animation_playing = true
            play_animation_enter()
        end
    end
end



------------------------------------------------------------------------------
-- main
------------------------------------------------------------------------------

-- prepare before animation
function play_animation_enter()
    hide_hud_inventory()
    if headgear_animations then headgear_animations.enable_animations = false end
    -- cur_slot = db.actor:active_slot()
    det_active = db.actor:active_detector() or nil
    if det_active then det_active:switch_state(2) end
    db.actor:activate_slot(0)

    wait_for_free_hands(play_animation_execute)
end


function play_animation_execute()
    if mcm_allow_movement then game.only_allow_movekeys(true) else level.disable_input() end
    fov_manager.restore_fov()
    
    if item_to_unequip and item_to_equip then
        swap()
    elseif item_to_unequip and not item_to_equip then
        unequip()
    elseif not item_to_unequip and item_to_equip then
        equip()
    end
end


-- restore after animation
function play_animation_exit()
    if mcm_allow_movement then game.only_allow_movekeys(false) else level.enable_input() end
    if headgear_animations then headgear_animations.enable_animations = true end
    item_to_equip = nil
    item_to_unequip = nil
    is_animation_playing = false
end

------------------------------------------------------------------------------

function equip()
    local anm = "anm_use"
    local cam = ini_sys:r_string_ex(item_to_equip, "cam")
    local snd = ini_sys:r_string_ex(item_to_equip, "snd")
    local length = game.get_motion_length(item_to_equip, anm, 1) / 1000
    xr_effects.play_snd(db.actor, nil, { [1] = snd })
    level.add_cam_effector(cam, 1301, false, "")
    game.play_hud_motion(2, item_to_equip, anm, false, 1)
    Invoke("restore_after_animation_te", length + 0.25, play_animation_exit)
end


function unequip()
    local anm = "anm_use"
    local cam = ini_sys:r_string_ex(item_to_unequip, "cam")
    local snd = ini_sys:r_string_ex(item_to_unequip, "snd")
    local length = game.get_motion_length(item_to_unequip, anm, 1) / 1000
    xr_effects.play_snd(db.actor, nil, { [1] = snd })
    level.add_cam_effector(cam, 1302, false, "")
    game.play_hud_motion(2, item_to_unequip, anm, false, 1)
    Invoke("restore_after_animation_te", length + 0.25, play_animation_exit)
end


function swap()
    local anm = "anm_use"
    local cam_unequip = ini_sys:r_string_ex(item_to_unequip, "cam")
    local snd_unequip = ini_sys:r_string_ex(item_to_unequip, "snd")
    local cam_equip = ini_sys:r_string_ex(item_to_equip, "cam")
    local snd_equip = ini_sys:r_string_ex(item_to_equip, "snd")
    local length_unequip = game.get_motion_length(item_to_unequip, anm, 1) / 1000
    local length_equip = game.get_motion_length(item_to_equip, anm, 1) / 1000

    xr_effects.play_snd(db.actor, nil, { [1] = snd_unequip })
    level.add_cam_effector(cam_unequip, 1303, false, "")
    game.play_hud_motion(2, item_to_unequip, anm, false, 1)
    Invoke("play_equip_animation_after_unequip_te", length_unequip, function ()
        xr_effects.play_snd(db.actor, nil, { [1] = snd_equip })
        level.add_cam_effector(cam_equip, 1300, false, "")
        game.play_hud_motion(2, item_to_equip, anm, false, 1)
        Invoke("restore_after_animation_te", length_equip + 0.25, play_animation_exit)
    end)
end


------------------------------------------------------------------------------
-- utils
------------------------------------------------------------------------------

function get_section_name(section)
    local faction = character_community(db.actor):sub(7)
    return section .. "_" .. faction .. "_hud"
end


function wait_for_free_hands(action_to_perform)
    local force_timer = 0
    CreateTimeEvent("outfit_animations_backpack", "wait_for_free_hands_te0", 0.1, function()
        if (db.actor:active_slot() == 0 and not db.actor:active_detector() and not enhanced_animations.used_item) or (force_timer > 5) then
            Invoke("wait_for_free_hands_te1", 0.1, action_to_perform) --i don understan y this works (ノへ￣、)
            return true
        end
        force_timer = force_timer + (device().time_delta / 1000)
        return false
    end)
end


function Invoke(name, time, action)
    CreateTimeEvent("outfit_animations_backpack", name, time, function()
        action()
        return true
    end)
end