extends Control

const OWNIVERSE_ITEM = preload("uid://d3xjfxwe3w16v")

const SPEED_TEXTURE_NAME_TEMPLATE = "res://ui/topmenu/time&speed/time%s.png"

const ItemDescription = preload("res://world/owniverse/item_description.gd")
var description_targets: Dictionary = {}
var description_samples: Dictionary = {}
var description_rates: Dictionary = {}
var description_elapsed: float = 0.0
const UI_UPDATE_INTERVAL: float = 0.1
var ui_elapsed: float = 0.0
var ui_pages: Vector2i = Vector2i(-1, -1)
var closing: bool = false

const PAGE_COUNT = 5
const RESOURCE_PAGE = 1
const PAGE_WIDTH = 1080
const DRAG_TOLERANCE = 360
const SWIPE_DURATION: float = 0.4

@onready var stage_page_scroller: ScrollContainer = $StageRows/PageScroller

@onready var item_pages: Array[Control] = [
    $StageRows/PageScroller/HBoxContainer/ForcePage/Forces,
    $StageRows/PageScroller/HBoxContainer/ResourcePage/HBoxContainer/Resources,
    $StageRows/PageScroller/HBoxContainer/StarPage/Stars,
    $StageRows/PageScroller/HBoxContainer/StructurePage/Structures,
    $StageRows/PageScroller/HBoxContainer/LifePage/Planets/Life,
    $StageRows/PageScroller/HBoxContainer/LifePage/Planets/LivingPlanet,
    $StageRows/PageScroller/HBoxContainer/LifePage/Planets/Civ0,
    $StageRows/PageScroller/HBoxContainer/LifePage/Planets/Civ1,
    $StageRows/PageScroller/HBoxContainer/LifePage/Planets/Civ2,
    $StageRows/PageScroller/HBoxContainer/LifePage/Planets/Civ3,
    $StageRows/PageScroller/HBoxContainer/LifePage/Planets/Civ4
]

@onready var page_actions: Dictionary[int, OwniverseAction] = {
    2: $StageRows/PageScroller/HBoxContainer/StarPage/Actions,
    3: $StageRows/PageScroller/HBoxContainer/StructurePage/Actions,
}

@onready var g_item_descriptions: Array = [
    $StageRows/PageScroller/HBoxContainer/ForcePage/Description,
    $StageRows/PageScroller/HBoxContainer/ResourcePage/Description,
    $StageRows/PageScroller/HBoxContainer/StarPage/Description,
    $StageRows/PageScroller/HBoxContainer/StructurePage/Description,
    $StageRows/PageScroller/HBoxContainer/LifePage/Description
]

@onready var date_time: Label = $StageRows/TopMenu/InfoPanel/DateTime

@onready var g_speed_icons: Array = [
    $StageRows/TopMenu/InfoPanel/Speed/Speed1,
    $StageRows/TopMenu/InfoPanel/Speed/Speed2,
    $StageRows/TopMenu/InfoPanel/Speed/Speed3,
    $StageRows/TopMenu/InfoPanel/Speed/Speed4,
    $StageRows/TopMenu/InfoPanel/Speed/Speed5,
    $StageRows/TopMenu/InfoPanel/Speed/Speed6,
    $StageRows/TopMenu/InfoPanel/Speed/Speed7,
    $StageRows/TopMenu/InfoPanel/Speed/Speed8
]

@onready var g_time_minus: TextureButton = $StageRows/TopMenu/TimeMinus
@onready var g_time_plus: TextureButton = $StageRows/TopMenu/TimePlus


var g_tween: Tween = null
var g_dragged_start: Vector2 = Vector2.ZERO
var g_scroll_start: int = 0
#var g_current_page: int = 0

var g_last_scroll_updated: int = 0

var f_check_swipe: bool = false
var g_swipe_time_delta: float = 0

var g_counters: Dictionary[String, Counter] = {
        "swipe": Counter.new(),
    }

var g_active_items: Dictionary = {}

var pending_page: int = -1

var owniverse:Owniverse = Owniverse.new()
var owniverse_items: Dictionary[String, OwniverseItem] = {}
var locked_items: Array = []


func set_datetime(value: float):
    # Simulation time advances in tenths of a year; displaying five decimal
    # places only adds zeroes and suggests precision the simulation does not
    # have.
    var text: String = Global.format_number(value, 1) if value != 0.0 else "0.0"
    if date_time.text != text:
        date_time.text = text

#region Item manipulations: update and visibility


func set_owniverse_item_value() -> void:
    for item_id in owniverse.items_to_update:
        if owniverse_items.has(item_id):
            var item: OwniverseItem = owniverse_items[item_id]
            if item.is_visible_in_tree() and item.get_global_rect().intersects(stage_page_scroller.get_global_rect()):
                item.set_label(owniverse.items_to_update[item_id])


func _refresh_ui(force: bool = false) -> void:
    if force or owniverse.item_amounts_dirty:
        owniverse.refresh_item_amounts(true)
    set_owniverse_item_value()
    set_datetime(owniverse.state.time.year)
    _set_active_page_actions()
    ui_elapsed = 0.0


func _update_ui(delta: float) -> void:
    ui_elapsed += delta
    var position_in_pages: float = float(stage_page_scroller.scroll_horizontal) / PAGE_WIDTH
    var pages := Vector2i(floori(position_in_pages), ceili(position_in_pages))
    if pages != ui_pages or ui_elapsed >= UI_UPDATE_INTERVAL:
        ui_pages = pages
        _refresh_ui()
        

#endregion


func _unlock_items():
    if locked_items.size() == 0: return
    var _new_locked_items = []
    var display_totals: Dictionary = owniverse.get_item_amounts(true)
    for _item_id in locked_items:
        #print(_item_id ' | ', _entity.unlock)
        var _flag_to_unlock = true
        for _elem in owniverse.entities[_item_id].unlock:
            if maxf(owniverse.state.stats.total_amount.get(_elem, 0.0), display_totals.get(_elem, 0.0)) < owniverse.entities[_item_id].unlock[_elem]:
                _flag_to_unlock = false
                break

        if _flag_to_unlock:
            var item_id: String = owniverse.entities[_item_id].count_as
            if item_id == "":
                item_id = _item_id
            if owniverse_items.has(item_id):
                owniverse_items[item_id].set_visible(true)
        else:
            _new_locked_items.append(_item_id)
    locked_items = _new_locked_items


func _on_indicator_pressed(indicator_name: String, page: int = 0):
    _set_description(indicator_name, page)


func _set_item_description(item: OwniverseItem) -> void:
    var category: String = "Entity" if owniverse.entities.has(item.item_id) else "Force"
    var id: String = item.item_id if category == "Entity" else item.item_name.capitalize()
    var page: int = clampi(item.item_page, 0, 4)
    if description_targets.get(page, {}).get("id", "") != id:
        description_samples.erase(id)
        description_rates.erase(id)
    description_targets[page] = {"id": id, "category": category}
    _refresh_descriptions()


func _set_description(item_name: String, page: int) -> void:
    description_targets[page] = {"id": item_name, "category": "Indicator"}
    _refresh_descriptions()


func _refresh_descriptions() -> void:
    for page in description_targets:
        var target: Dictionary = description_targets[page]
        var label: RichTextLabel = g_item_descriptions[page]
        label.bbcode_enabled = true
        label.text = ItemDescription.render(owniverse, Global, target.id, target.category, description_rates.get(target.id, 0.0))


func _update_descriptions(delta: float) -> void:
    description_elapsed += delta
    if description_elapsed < 0.25:
        return
    for page in description_targets:
        var id: String = description_targets[page].id
        var total: float = ItemDescription.quantities(owniverse, id).total
        description_rates[id] = (total - description_samples[id]) / description_elapsed if description_samples.has(id) else 0.0
        description_samples[id] = total
    description_elapsed = 0.0
    _refresh_descriptions()


func _control_page(item: OwniverseItem) -> void:
    # TODO переписать это ↓
    if !g_active_items.has(item.item_page):
        g_active_items[item.item_page] = null
        
    var current_item: OwniverseItem = g_active_items[item.item_page]
    if current_item == item:
        return
    
    g_active_items[item.item_page] = item
    
    if current_item != null and current_item.item_page == item.item_page:
        current_item.set_selection(false)

    item.set_selection(true)

    # subpages
    if item.item_sub_page != -1:
        item_pages[item.item_sub_page].visible = true

    if current_item == null \
            or current_item.item_sub_page == -1 \
            or current_item.item_sub_page == item.item_sub_page:
        return
    item_pages[current_item.item_sub_page].visible = false


func _init_owniverse_items() -> bool:
    owniverse_items = {}
    for item_id in Global.OwniverseItems:
        var item_props: Dictionary = Global.OwniverseItems[item_id]
        var item: OwniverseItem = OWNIVERSE_ITEM.instantiate()
        if !item_props.has("page"):
            printerr("Item `", item_id, "` has no `page` key.")
            return false
        var page: int = int(item_props.page)
        item_pages[page].add_child(item)
        item.init_button(item_props)
        item.item_activated.connect(item_activated)
        
        owniverse_items[item_id] = item
        
    return false


func item_activated(item: OwniverseItem) -> void:
    _control_page(item)
    _set_item_description(item)
    
    if item.item_id == "S" or item.item_id == "H":
        var _value = owniverse.produce_hs(item.item_id, 100_000)
    _unlock_items()
    _refresh_ui(true)
    _refresh_descriptions()
    

func _check_counters(delta: float) -> Array:
    var actions: Array = []
    for k in g_counters:
        var cnt: Counter = g_counters[k]
        if not cnt.is_active:
            continue
            
        cnt.value += delta
        if cnt.value >= cnt.sec:
            actions.append(k)
            cnt.value = 0
            cnt.is_active = false
        
    return actions


#region Swipe and page

func _do_actions(actions: Array) -> void:
    for action: String in actions:
        match action:
            "swipe":
                _swipe_to_nearest_page()


func _swipe_to_nearest_page() -> void:
    if stage_page_scroller.scroll_horizontal % PAGE_WIDTH == 0: return
    
    var new_page: int = round(1.0 * stage_page_scroller.scroll_horizontal / PAGE_WIDTH)

    if g_tween != null:
        if g_tween.is_running():
            return

    g_tween = stage_page_scroller.get_tree().create_tween()
    g_tween.tween_property(stage_page_scroller, "scroll_horizontal",
        new_page * PAGE_WIDTH, SWIPE_DURATION).set_trans(Tween.TRANS_CUBIC).set_ease(Tween.EASE_OUT)


func _input(event: InputEvent) -> void:
    if event is InputEventScreenDrag:
        stage_page_scroller.scroll_horizontal = clamp(
                stage_page_scroller.scroll_horizontal - PAGE_COUNT * event.screen_relative.x,
                0, PAGE_WIDTH * (PAGE_COUNT - 1))
        g_counters.swipe.is_active = true
        g_counters.swipe.value = 0
    elif event is InputEventPanGesture:
        g_counters.swipe.is_active = true
        g_counters.swipe.value = 0
    elif event is InputEventScreenTouch:
        pass

    
func _set_active_page_actions() -> void:
    for pa in page_actions:
        if !g_active_items.has(pa): continue
        if not page_actions[pa].is_visible_in_tree() or not page_actions[pa].get_global_rect().intersects(stage_page_scroller.get_global_rect()):
            continue
        
        var item_id: String = g_active_items[pa].item_id
        var entity: OwniverseEntity = owniverse.entities[item_id]

        #var amount = owniverse.get_available_to_produce(item_id)
        
        #var amount = owniverse.get_available_to_produce(entity)
        var amount = owniverse.calculate_max_producible(entity)
        #print(item_id, " : ", amount)
        if item_id == "SMBH":
            var preview: Callable = func(requested: float) -> float:
                return owniverse.calculate_max_producible(entity, requested)
            page_actions[pa].set_actions(item_id, amount, preview)
        else:
            page_actions[pa].set_actions(item_id, amount)


func _page_action_pressed(page_id: int, action_amount: float) -> void:
    if !g_active_items.has(page_id):
        return
        
    var item_id: String = g_active_items[page_id].item_id
    
    if action_amount > 0:
        owniverse.produce(item_id, action_amount)
        _unlock_items()
        _refresh_ui(true)
        _refresh_descriptions()


#endregion


func _ready() -> void:
    get_tree().auto_accept_quit = false
    owniverse.defer_item_updates = true
    var inited_result = init_enitities()
    locked_items = inited_result.locked_items
    load_data()
    _init_owniverse_items()
    owniverse.refresh_item_amounts()
    _change_speed(0)
    set_datetime(owniverse.state.time.year)
    set_owniverse_item_value()
    _unlock_items()
    _refresh_ui(true)
    
    g_counters.swipe.sec = 0.2

    for pa in page_actions:
        page_actions[pa].action_pressed.connect(_page_action_pressed)
        page_actions[pa].page_id = pa

    
func _process(delta: float) -> void:
    
    owniverse.evolute(delta)
    _update_descriptions(delta)
    _update_ui(delta)
    
    #owniverse.cycle(delta)
    
    #owniverse.cycle_legacy(year_delta)
    
    var actions = _check_counters(delta)
    _do_actions(actions)
    


func _change_speed(delta: int) -> void:
    
    owniverse.speed = owniverse.speed + delta
    
    var speed: int = owniverse.speed
    var ind: int = 1
    for icon in g_speed_icons:
        if ind <= speed:
            icon.visible = true
        else:
            icon.visible = false
        ind += 1
    if speed == 1:
        g_time_minus.texture_normal = load(SPEED_TEXTURE_NAME_TEMPLATE % "x")
        g_time_plus.texture_normal = load(SPEED_TEXTURE_NAME_TEMPLATE % "2")
    elif speed == Global.SPEED_LIMIT:
        g_time_minus.texture_normal = load(SPEED_TEXTURE_NAME_TEMPLATE % str(Global.SPEED_LIMIT - 1))
        g_time_plus.texture_normal = load(SPEED_TEXTURE_NAME_TEMPLATE % "x")
    else:
        g_time_minus.texture_normal = load(SPEED_TEXTURE_NAME_TEMPLATE % str(speed - 1))
        g_time_plus.texture_normal = load(SPEED_TEXTURE_NAME_TEMPLATE % str(speed + 1))
 
   
func _on_topmenu_button_pressed(_ButtonName) -> void:
    print("Debug → ")
    #, owniverse.state)
    for id in owniverse.state.batches:
        var s = owniverse.state.batches[id].size()
        if s != 0:
            print(id, " → ", s)
            #, owniverse.state.batches[id])
            if id == 'HG':
                print(owniverse.state.batches[id])
    
    #var s: float = 1E15
    #var z = 1.0
    #for i in range(30):
        #print(i, " | ", z, " | ", " | ", s - z)
        #z *= 10
    print("-------")


func _on_unlock_and_save_timeout() -> void:
    save_data()
    _unlock_items()


#region Init save load routines


func load_data() -> bool:
    var game_data: Dictionary = SaveManager.load_data("owniverse", "qwerty")
    if game_data.is_empty():
        if SaveManager.last_error == "":
            pending_page = RESOURCE_PAGE
            _restore_page.call_deferred()
        return false
    var restored: Dictionary = game_data.state
    # Current definitions are initialized first; reject incompatible saves before publishing.
    for id in owniverse.state.amount:
        if not restored.amount.has(id) or not restored.stats.total_amount.has(id):
            SaveManager.blocked_saves["owniverse"] = true
            push_error("Save is missing the current entity: " + id)
            return false
    owniverse.state = restored
    owniverse.new_state = restored.duplicate(true)
    owniverse.initialize_life_batches()
    owniverse.refresh_item_amounts()
    pending_page = clampi(int(game_data.get("ui", {}).get("current_page", 0)), 0, PAGE_COUNT - 1)
    _restore_page.call_deferred()
    return true


func _restore_page() -> void:
    # Wait until containers have calculated the scrollable width.
    await get_tree().process_frame
    if pending_page >= 0:
        stage_page_scroller.scroll_horizontal = pending_page * PAGE_WIDTH
        pending_page = -1
    _refresh_ui(true)


func save_data() -> void:
    var page: int = pending_page
    if page < 0:
        page = clampi(roundi(float(stage_page_scroller.scroll_horizontal) / PAGE_WIDTH), 0, PAGE_COUNT - 1)
    SaveManager.request_save("owniverse", "qwerty", {
        "state": owniverse.state,
        "ui": {"current_page": page},
    })


func _notification(what: int) -> void:
    if not is_node_ready() or closing:
        return
    if what == NOTIFICATION_WM_CLOSE_REQUEST:
        _close_after_save()
    elif what == NOTIFICATION_APPLICATION_PAUSED:
        save_data()
        # Mobile platforms can suspend all processing immediately after this event.
        SaveManager.flush_saves()


func _close_after_save() -> void:
    closing = true
    set_process(false)
    set_process_input(false)
    mouse_filter = Control.MOUSE_FILTER_IGNORE
    # Stop GUI actions too while the final snapshot is being written.
    process_mode = Node.PROCESS_MODE_DISABLED
    save_data()
    if SaveManager.is_saving():
        await SaveManager.saves_drained
    get_tree().quit()


func init_enitities() -> Dictionary:
    var _result := {
            'locked_items': [],
        }
    for entity_id in Global.OwniverseEntities:
        var entity = OwniverseEntity.new(Global.OwniverseEntities[entity_id])
        owniverse.entities[entity_id] = entity
        
        owniverse.state.stats.total_amount[entity_id] = 0
        owniverse.state.amount[entity_id] = 0
        if entity.lifespan > 0:
            owniverse.state.batches[entity.id] = []
            owniverse.add_entity_to_batch(entity_id, 0, 0)
        if entity.group_as != "":
            owniverse.state.amount[entity.group_as] = 0

            owniverse.state.stats.total_amount[entity.group_as] = 0
        
        if entity.unlock != {}:
            owniverse.locked_entities.append(entity)
            _result.locked_items.append(entity.id)
            
        if entity.product_per_year_type != "":
            owniverse.auto_production.append(entity)

        # groups
        if entity.group_as != "":
            if !owniverse.entity_groups.has(entity.group_as):
                owniverse.entity_groups[entity.group_as] = []
            owniverse.entity_groups[entity.group_as].append(entity_id)
            
        if entity.event_group != "":
            if !owniverse.entity_event_groups.has(entity.event_group):
                owniverse.entity_event_groups[entity.event_group] = []
            owniverse.entity_event_groups[entity.event_group].append(entity_id)

    return _result

#endregion