extends Control
const E = preload("res://world/owniverse/math/exact.gd")

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")
const WorldIndicators = preload("res://ui/indicators/world_indicators.gd")
var world_indicators: RefCounted
var indicator_elapsed: float = 0.0
var description_targets: Dictionary = {}
var description_samples: Dictionary = {}
var description_rates: Dictionary = {}
var description_elapsed: float = 0.0

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 = $World/PageScroller

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

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

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

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

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

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

@onready var screens: Dictionary = {
    "World": $World,
    "MainMenu": $MainMenu,
    "Report": $Report,
    "Achievements": $Achievements,
    "Credits": $Credits,

}

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 active_actions_dirty: bool = true
var active_actions_elapsed: float = 0.0

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


func set_datetime(value):
    # Simulation time advances in tenths of a year; displaying five decimal
    # places only adds zeroes and suggests precision the simulation does not
    # have.
    date_time.text = Global.format_number(value, 1) if not E.eq(value, 0) else "0.0"

#region Item manipulations: update and visibility


func set_owniverse_item_value() -> void:
    for item_id in owniverse.presentation.pending_amounts:
        if owniverse_items.has(item_id):
            owniverse_items[item_id].set_label(owniverse.presentation.pending_amounts[item_id])
    owniverse.presentation.pending_amounts.clear()


#endregion


func _unlock_items():
    var result: Dictionary = owniverse.presentation.unlocks(owniverse.state, owniverse.catalog, locked_items)
    for item_id in result.visible:
        if owniverse_items.has(item_id):
            owniverse_items[item_id].set_visible(true)
    locked_items = result.remaining

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.catalog.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 = ItemDescription.quantities(owniverse, id).total
        description_rates[id] = E.divide(E.subtract(total, description_samples[id]), E.of(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
    active_actions_dirty = true

    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.state.amount[item.item_id]
        _value = E.multiply(9, _value) if E.gt(_value, 0) else 1
        owniverse.request_production(item.item_id, _value, true)


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

        var item_id: String = g_active_items[pa].item_id
        var entity: OwniverseEntity = owniverse.catalog.entities[item_id]

        #var amount = owniverse.get_available_to_produce(item_id)

        #var amount = owniverse.get_available_to_produce(entity)
        var amount = owniverse.production.calculate_max_producible(entity)
        #print(item_id, " : ", amount)
        if item_id == "SMBH":
            var preview: Callable = func(requested):
                return owniverse.production.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) -> void:
    if !g_active_items.has(page_id):
        return

    var item_id: String = g_active_items[page_id].item_id

    if E.gt(action_amount, 0):
        owniverse.request_production(item_id, action_amount)


#endregion


func _ready() -> void:
    get_tree().auto_accept_quit = false
    world_indicators = WorldIndicators.new(self)
    create_new_universe()
    load_data()
    _refresh_universe_ui()

    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


## Starts a fresh universe. Can be connected directly to a button's pressed signal.
## Saving continues through the normal autosave/close path.
func create_new_universe() -> void:
    var previous: Owniverse = owniverse
    owniverse = Owniverse.new()
    var inited_result: Dictionary = init_enitities()
    locked_items = inited_result.locked_items

    for entity in previous.catalog.entities.values():
        entity.free()
    previous.free()

    if is_instance_valid(g_tween):
        g_tween.kill()
    g_active_items.clear()
    description_targets.clear()
    description_samples.clear()
    description_rates.clear()
    description_elapsed = 0.0
    active_actions_dirty = true
    active_actions_elapsed = 0.0
    for label in g_item_descriptions:
        label.text = ""
    for item in owniverse_items.values():
        item.get_parent().remove_child(item)
        item.queue_free()
    _init_owniverse_items()
    for page in range(5, item_pages.size()):
        item_pages[page].visible = false
    for actions in page_actions.values():
        actions.set_actions("", 0.0)
    pending_page = RESOURCE_PAGE
    _restore_page.call_deferred()
    _refresh_universe_ui()
    _on_topmenu_button_pressed("World")


func _refresh_universe_ui() -> void:
    owniverse.presentation.refresh(owniverse.state, owniverse.catalog)
    _change_speed(0)
    set_datetime(owniverse.state.time.year)
    set_owniverse_item_value()
    _unlock_items()
    if world_indicators != null: world_indicators.update(owniverse)

func _process(delta: float) -> void:

    owniverse.evolute_frame(delta, get_tree())
    indicator_elapsed += delta
    if indicator_elapsed >= 0.1:
        indicator_elapsed = 0.0
        world_indicators.update(owniverse)
    _update_descriptions(delta)
    set_owniverse_item_value()
    set_datetime(owniverse.state.time.year)

    #owniverse.cycle(delta)

    #owniverse.cycle_legacy(year_delta)

    var actions = _check_counters(delta)
    _do_actions(actions)
    # Production limits are expensive (they walk the resource ledger). Refresh
    # them when selection changes and at a modest cadence instead of every
    # rendered frame. The simulation itself continues to run every frame.
    active_actions_elapsed += delta
    if active_actions_dirty or active_actions_elapsed >= 0.1:
        active_actions_elapsed = 0.0
        active_actions_dirty = false
        _set_active_page_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(screen_name: String) -> void:

    for screen_id in screens:
        #print(screen_name, " ←→ ", screen_id)
        screens[screen_id].visible = screen_id == screen_name


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
    var complete: Dictionary = owniverse.state.duplicate(true)
    complete.merge(restored, true)
    owniverse.state = complete
    owniverse.restore_frame_checkpoint(game_data.get("simulation", {}))

    owniverse.evolution.initialize_life_batches()
    owniverse.presentation.refresh(owniverse.state, owniverse.catalog)
    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


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,
        "simulation": owniverse.frame_checkpoint(),
        "ui": {"current_page": page},
    })


var closing: bool = false


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()
        # The OS may suspend frames immediately; finish the queued write now.
        SaveManager.flush_saves()


func _close_after_save() -> void:
    closing = true
    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': [],
        }
    owniverse.catalog.load_definitions(Global.OwniverseEntities)
    for entity_id in owniverse.catalog.entities:
        var entity: OwniverseEntity = owniverse.catalog.entities[entity_id]

        owniverse.state.stats.total_amount[entity_id] = 0
        owniverse.state.amount[entity_id] = 0
        if E.gt(entity.lifespan, 0):
            owniverse.state.batches[entity.id] = []
            owniverse.batches.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 != {}:
            _result.locked_items.append(entity.id)

    return _result

#endregion


func _on_achievements_pressed(extra_arg_0: String) -> void:
    pass # Replace with function body.


func _on_credits_pressed(extra_arg_0: String) -> void:
    pass # Replace with function body.