// Toasts/Components/AC_ToastSystem.ts

import type { S_ToastMessage } from '#root/Toasts/Structs/S_ToastMessage.ts';
import type { WBP_Toast } from '#root/Toasts/UI/WBP_Toast.ts';
import { WBP_ToastContainer } from '#root/Toasts/UI/WBP_ToastContainer.ts';
import { ActorComponent } from '#root/UE/ActorComponent.ts';
import { CreateWidget } from '#root/UE/CteateWidget.ts';
import type { Float } from '#root/UE/Float.ts';
import type { Integer } from '#root/UE/Integer.ts';
import { SystemLibrary } from '#root/UE/SystemLibrary.ts';
import type { Text } from '#root/UE/Text.ts';
import { UEArray } from '#root/UE/UEArray.ts';
import { E_MessageType } from '#root/UI/Enums/E_MessageType.ts';

/**
 * Toast Notification System Component
 * Manages temporary status messages with automatic positioning and lifecycle
 * Provides visual feedback for debug operations and system events
 */
export class AC_ToastSystem extends ActorComponent {
  // ════════════════════════════════════════════════════════════════════════════════════════
  //                                    FUNCTIONS
  // ════════════════════════════════════════════════════════════════════════════════════════

  /**
   * Check if toast system should process updates this frame
   * @returns True if system is initialized and enabled
   * @pure
   * @category Toast Management
   */
  private ShouldProcessToasts(): boolean {
    /**
     * Validate system state and settings
     */

    return this.IsInitialized && this.IsEnabled;
  }

  /**
   * Remove expired toasts from the system
   * @category Toast Lifecycle
   */
  private RemoveExpiredToasts(): void {
    let i = 0;

    /**
     * Check if there are more toasts to process
     */
    const HasMoreToastsToCheck = (activeToastsLength: Integer): boolean =>
      i < activeToastsLength;

    while (HasMoreToastsToCheck(this.ActiveToasts.length)) {
      /**
       * Check if toast has exceeded its display duration
       */
      const IsToastExpired = (
        currentTime: Float,
        createdTime: Float,
        duration: Float
      ): boolean => currentTime - createdTime > duration;

      const el = this.ActiveToasts.Get(i);

      if (
        IsToastExpired(
          SystemLibrary.GetGameTimeInSeconds(),
          el.CreatedTime,
          el.Duration
        )
      ) {
        const widget = this.ToastWidgets.Get(i);

        if (SystemLibrary.IsValid(widget)) {
          if (SystemLibrary.IsValid(this.ToastContainer)) {
            this.ToastContainer.RemoveToast(widget);
          }
        }

        this.ActiveToasts.RemoveIndex(i);
        this.ToastWidgets.RemoveIndex(i);
      } else {
        i++;
      }
    }
  }

  /**
   * Enforce maximum visible toasts limit
   * Removes oldest toasts when limit is exceeded
   * @category Toast Lifecycle
   */
  private EnforceToastLimit(): void {
    /**
     * Check if current toast count exceeds maximum allowed
     */
    const ExceedsToastLimit = (
      activeToastsLength: Integer,
      maxVisibleToasts: Integer
    ): boolean => activeToastsLength >= maxVisibleToasts;

    while (ExceedsToastLimit(this.ActiveToasts.length, this.MaxVisibleToasts)) {
      const widget = this.ToastWidgets.Get(0);

      if (SystemLibrary.IsValid(widget)) {
        if (SystemLibrary.IsValid(this.ToastContainer)) {
          this.ToastContainer.RemoveToast(widget);
        }
      }

      this.ActiveToasts.RemoveIndex(0);
      this.ToastWidgets.RemoveIndex(0);
    }
  }

  /**
   * Create and display a new toast message
   * @param Message - Text to display in the toast
   * @param Type - Type of toast (affects color and styling)
   * @param Duration - How long to display toast (optional, uses default)
   * @returns Toast ID for tracking
   * @example
   * // Create success toast
   * ShowToast("Test passed!", E_MessageType.Success, 2.0)
   * // Create error toast with default duration
   * ShowToast("Test failed!", E_MessageType.Error)
   * @category Toast Creation
   */
  public ShowToast(
    Message: Text = '',
    Type: E_MessageType = E_MessageType.Info,
    Duration: Float = 5
  ): Integer {
    if (this.ShouldProcessToasts()) {
      const currentTime = SystemLibrary.GetGameTimeInSeconds();

      const newToast: S_ToastMessage = {
        ID: this.NextToastID++,
        Message,
        Type,
        Duration,
        CreatedTime: currentTime,
      };

      this.EnforceToastLimit();

      if (SystemLibrary.IsValid(this.ToastContainer)) {
        const toastWidget = this.ToastContainer.AddToast(Message, Type);

        if (SystemLibrary.IsValid(toastWidget)) {
          this.ActiveToasts.Add(newToast);
          this.ToastWidgets.Add(toastWidget);
          this.LogToConsole(Type, Message);
          return newToast.ID;
        } else {
          return -1;
        }
      }
    }

    this.LogToConsole(Type, Message);
    return -1;
  }

  /**
   * Main update loop for toast system
   * Removes expired toasts automatically
   * @category System Main Loop
   */
  public UpdateToastSystem(): void {
    if (this.ShouldProcessToasts()) {
      this.RemoveExpiredToasts();
    }
  }

  /**
   * Get system state and configuration for testing purposes
   * Provides read-only access to private configuration and active widgets
   * @returns Object containing toast widgets array and system configuration
   * @category Testing
   */
  public GetTestData(): {
    ToastWidgets: UEArray<WBP_Toast>;
    MaxVisibleToasts: Integer;
    IsEnabled: boolean;
  } {
    return {
      ToastWidgets: this.ToastWidgets,
      MaxVisibleToasts: this.MaxVisibleToasts,
      IsEnabled: this.IsEnabled,
    };
  }

  /**
   * Initialize toast system with container widget
   * @example
   * // Initialize toast system in main character
   * this.ToastSystemComponent.InitializeToastSystem();
   * @category System Setup
   */
  public InitializeToastSystem(): void {
    this.ToastContainer = CreateWidget(WBP_ToastContainer);
    this.ToastContainer.InitializeContainer();
    this.IsInitialized = true;
    this.NextToastID = 1;
  }

  /**
   * Log toast message to console if enabled
   * @param Type - Message type for formatting
   * @param Message - Message text to log
   * @category System Utilities
   */
  public LogToConsole(Type: E_MessageType, Message: Text): void {
    if (this.AlsoLogToConsole) {
      SystemLibrary.PrintString(`[${Type}] ${Message}`, false);
    }
  }

  // ════════════════════════════════════════════════════════════════════════════════════════
  //                                    VARIABLES
  // ════════════════════════════════════════════════════════════════════════════════════════

  /**
   * Maximum number of simultaneously visible toast notifications
   * When limit is exceeded, oldest toasts are automatically removed
   * @default 5
   * @range 1-10 recommended
   * @category System Config
   * @instanceEditable true
   */
  private readonly MaxVisibleToasts: Integer = 5;

  /**
   * Duplicate all toast messages to console output for debugging
   * Format: [MessageType] Message text
   * @default true
   * @recommendation Set false in production builds for performance
   * @category System Config
   * @instanceEditable true
   */
  private readonly AlsoLogToConsole: boolean = true;

  /**
   * Master switch for the entire toast system
   * When disabled: ShowToast() returns -1, widgets are not created
   * LogToConsole still works if AlsoLogToConsole is true
   * @default true
   * @category System Config
   * @instanceEditable true
   */
  private readonly IsEnabled: boolean = true;

  /**
   * System initialization state flag
   * Set to true after successful InitializeToastSystem call
   * @category System State
   */
  private IsInitialized: boolean = false;

  /**
   * Next unique ID for new toasts
   * Incremented for each new toast
   * @category System State
   */
  private NextToastID: Integer = 1;

  /**
   * Toast container widget that handles positioning and layout
   * @category Container Management
   */
  private ToastContainer: WBP_ToastContainer | null = null;

  /**
   * Array of currently active toast messages
   * Contains all visible toasts with metadata
   * @category Toast Management
   */
  private ActiveToasts: UEArray<S_ToastMessage> = new UEArray([]);

  /**
   * Array of toast widget instances
   * Corresponds to ActiveToasts array for UI display
   * @category Widget Management
   */
  private ToastWidgets: UEArray<WBP_Toast> = new UEArray([]);
}