frame-of-mind/src/logic-scenes/board/card-board.gd

extends PanelContainer

var area_dict = {}
enum ui_context {DROPZONE, POST_IT_LIST, ASSIGN_POST_IT}

@onready var dropzone = $HBoxContainer/dropzone
@onready var active_context = ui_context.DROPZONE     # 0 = dropzone, 1 = post it list

var currently_selected_node: Area2D = null
var currently_selected_card_for_assigning: Area2D = null
var is_area_dragged: bool = false
var currently_dragged_area: Area2D

var selected_dropzone_element: int = -1
var selected_postit_list_element: int = 0
var selected_card_for_assignment

# Called when the node enters the scene tree for the first time.
func _ready():
    populate_board()
    reorder_areas("dropzone_content")
    
    active_context = ui_context.DROPZONE
    
    
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
    # Reset information about Areas being dragged, if the mouse is not longer pressed.
    # Needed because otherwise it can happen that the areas don't register it if you stop clicking on them.
    if !Input.is_mouse_button_pressed(MOUSE_BUTTON_LEFT) and is_area_dragged:
        currently_dragged_area.is_dragged = false
        is_area_dragged = false
        currently_dragged_area = null
    
    #if active_context == ui_context.ASSIGN_POST_IT:
        


# Will be used later to spawn Cards and Post-Its and remember them in the dictionary 
func populate_board():
    # TODO: Currently populating the dictionary with the Nodes currently in the scene
    # When opening the scene we need to pass some kind of collection to the Board
    # Then it can display the Card/PostIts and populate its dictionary at the same time
    var cards = dropzone.get_children()
    var post_it_panels = get_child(0).get_child(1).get_child(0).get_children()
    var post_its = Array()
    
    for panel in post_it_panels:
        post_its.push_back(panel.get_child(1))
            
    area_dict["dropzone_content"] = cards            # will be selected on the left side
    area_dict["post_it_panels"] = post_it_panels     # to remember panel positions
    area_dict["post_its_in_list"] = post_its         # will be selected on the right side

    currently_selected_node = area_dict["dropzone_content"][0]  # set first Card as currently selected node by default


# Checks if a Node is currently inside the dropzone
func is_in_dropzone(to_check: Node) -> bool:
    if (dropzone.size.x < to_check.global_position.x or dropzone.size.y < to_check.global_position.y):
        return false
    elif (to_check.global_position.x < 0 or to_check.global_position.y < 0):
        return false
    else: 
        return true


func handle_mouse_button(to_handle: Area2D, input: InputEvent):
    # No two areas can be dragged at the same time.
    # Make sure that only the same area is dragged.
    # Otherwise overlapping areas are dragged at the same time. 
    if currently_dragged_area != null and to_handle != currently_dragged_area:
        return
    
    currently_selected_node = to_handle  # update currently selected
    currently_dragged_area = to_handle
    to_handle.is_dragged = input.pressed
    is_area_dragged = input.pressed
    
    # TODO: We need a better way to recognize whether "to_handle" is a Card or a Post-It.
    # (Tried checking for a script, didn't work, because script has no name attached.
    # Alternative might be to check for specific values within the script ("is_card" f.e))
    match to_handle.get_meta("type"):
        "card": # 1 = Card
            active_context = ui_context.DROPZONE
            if input.is_pressed():
                reorder_areas("dropzone_content")
            else:
                currently_dragged_area = null
        "post-it": # 2 = PostIt
            if input.is_pressed():
                to_handle.reparent(dropzone)
                to_handle.set_owner(self)   # needs to be here otherwise the owner disappears
                area_dict["post_its_in_list"].erase(to_handle)
                area_dict["dropzone_content"].push_back(to_handle)
                # TODO (if needed): Add function to rearrange the array based on positions in the dropzone
            else:
                if is_in_dropzone(to_handle):
                        if to_handle.has_overlapping_areas():
                            for area in to_handle.get_overlapping_areas():
                                if area.get_meta("type") == "card":
                                    if !area.has_postit_attached():
                                        attach_postit_to_card(to_handle, area)
                        else:
                            to_handle.rotation = to_handle.base_rotation
                            to_handle.scale = to_handle.base_scale
                else:
                    active_context = ui_context.POST_IT_LIST
                    _return_postit_to_panels(to_handle)
                currently_dragged_area = null


# Logic for attaching a postit to a card. Also reset postit positions if the card cannot be attached
func attach_postit_to_card(postit: Area2D, card: Area2D, update_dict = false):
    postit.reparent(card)
    postit.set_owner(self)
    postit.position = card.get_child(3).position
    
    if update_dict:
        area_dict["post_its_in_list"].erase(postit)
        area_dict["dropzone_content"].push_back(postit)
        
    reorder_areas("dropzone_content")
    reorder_areas("post_its_in_list")


# Mark area that was hovered over as currently selected
func handle_hover(to_handle: Area2D):
    currently_selected_node.highlighted = false
    currently_selected_node = to_handle
    
    if is_in_dropzone(to_handle):
        selected_dropzone_element = area_dict["dropzone_content"].find(to_handle)
        active_context = ui_context.DROPZONE
    else:
        selected_postit_list_element = area_dict["post_its_in_list"].find(to_handle)
        active_context = ui_context.POST_IT_LIST
        

# Reorders the areas in any of the dictionaries entries
# Pass the entries key in order to reorder it
func reorder_areas(reorder: String):
    var old_order = area_dict[reorder]
    var new_order = Array()
        
    for obj in old_order:
        var i = 0
        if !new_order.is_empty():
            for obj_2 in new_order:
                if obj_2.position.y < obj.position.y:
                    i += 1
        new_order.insert(i, obj)


# Takes the inputs for control inputs
func _input(event):
    # Return, if the input is a mouse event (mouse events are handled separately)
    if event is InputEventMouse: return
    
    if event.is_action_pressed("ui_up"):            # up to select an element above
        match active_context:
            ui_context.DROPZONE:
                selected_dropzone_element -= 1
            ui_context.POST_IT_LIST:
                selected_postit_list_element -= 1
            ui_context.ASSIGN_POST_IT:
                selected_card_for_assignment -= 1
                
    elif event.is_action_pressed("ui_down"):       # down to select an element beneath
        match active_context:
            ui_context.DROPZONE:
                selected_dropzone_element += 1
            ui_context.POST_IT_LIST:
                selected_postit_list_element += 1
            ui_context.ASSIGN_POST_IT:
                selected_card_for_assignment += 1
                
    elif event.is_action_pressed("ui_left"):        # left to switch context to the left
        active_context -= 1
        if active_context < 0:
            active_context = ui_context.POST_IT_LIST
            
    elif event.is_action_pressed("ui_right"):       # right to switch context to the right
        active_context += 1
        if active_context > 2:
            active_context = ui_context.DROPZONE
            
    elif event.is_action_pressed("ui_select"):              # select the selected post it
        if active_context == ui_context.ASSIGN_POST_IT:     # to assign it to a card
            attach_postit_to_card(currently_selected_node, 
            currently_selected_card_for_assigning, true)
            _leave_assignment_context()
        else:
            _enter_assignment_context()
        
    
    # do some adjustments to loop elements (after last element, select first one etc.)
    if selected_dropzone_element < 0:
        selected_dropzone_element = area_dict["dropzone_content"].size()-1
    elif selected_dropzone_element > area_dict["dropzone_content"].size()-1:
        selected_dropzone_element = 0

    if selected_postit_list_element < 0:
        selected_postit_list_element = area_dict["post_its_in_list"].size()-1
    elif selected_postit_list_element > area_dict["post_its_in_list"].size()-1:
        selected_postit_list_element = 0
    
    if active_context == ui_context.ASSIGN_POST_IT:       # skip this if we're not in assign post it context
        if selected_card_for_assignment < 0:
            selected_card_for_assignment = area_dict["dropzone_content"].size()-1
        elif selected_card_for_assignment > area_dict["dropzone_content"].size()-1:
            selected_card_for_assignment = 0
    
    # highlight the selected element
    match active_context:
        ui_context.DROPZONE:
            currently_selected_node.highlighted = false
            currently_selected_node = area_dict["dropzone_content"][selected_dropzone_element]
            currently_selected_node.highlighted = true
        ui_context.POST_IT_LIST:
            currently_selected_node.highlighted = false
            currently_selected_node = area_dict["post_its_in_list"][selected_postit_list_element]
            currently_selected_node.highlighted = true
        ui_context.ASSIGN_POST_IT:
            currently_selected_card_for_assigning.highlighted = false
            currently_selected_card_for_assigning = area_dict["dropzone_content"][selected_card_for_assignment]
            currently_selected_card_for_assigning.highlighted = true
    
    # update dictiornary orders
    reorder_areas("dropzone_content")
    reorder_areas("post_its_in_list")


# Sets everything up to enter the context where postits can be assigned via button controls
func _enter_assignment_context():
    # cards are currently not moved, only post its. Exit function if a card should be moved.
    if currently_selected_node == null or currently_selected_node.get_meta("type") != "post-it" : return
    
    # if the postit is already attached, remove it and return it to the post it panels
    if currently_selected_node.is_postit_attached():
        _return_postit_to_panels(currently_selected_node)
        active_context = ui_context.POST_IT_LIST
        return
    
    # adjust everything for the post it to select its attach-target
    active_context = ui_context.ASSIGN_POST_IT
    selected_card_for_assignment = 0
    currently_selected_card_for_assigning = area_dict["dropzone_content"][0]
    currently_selected_card_for_assigning.highlighted = true


# leaves the context for assigning postit via button controls
func _leave_assignment_context():
    currently_selected_node.highlighted = false
    active_context = ui_context.DROPZONE
    currently_selected_node = currently_selected_card_for_assigning


# handles everything to return a post it to the panels
func _return_postit_to_panels(postit: Area2D):
    for panel in area_dict["post_it_panels"]:
        if panel.get_child_count() == 1:
            postit.reparent(panel)
            postit.set_owner(self)
            area_dict["dropzone_content"].erase(postit)
            area_dict["post_its_in_list"].push_back(postit)
            postit.position = panel.get_child(0).position
            postit.rotation = postit.base_rotation
            postit.scale = postit.base_scale
            reorder_areas("dropzone_content")
            reorder_areas("post_its_in_list")
            break