/**
 * Dashboard Utilities
 * Helper functions for dashboard data processing and formatting
 */

import type { Activity, ActivityFilter, ActivityFilterConfig } from "@customer-portal/domain/dashboard";

/**
 * Activity filter configurations
 */
export const ACTIVITY_FILTERS: ActivityFilterConfig[] = [
  { key: "all", label: "All" },
  {
    key: "billing",
    label: "Billing",
    types: ["invoice_created", "invoice_paid"],
  },
  {
    key: "orders",
    label: "Orders",
    types: ["service_activated"],
  },
  {
    key: "support",
    label: "Support",
    types: ["case_created", "case_closed"],
  },
];

/**
 * Filter activities by type
 */
export function filterActivities(activities: Activity[], filter: ActivityFilter): Activity[] {
  if (filter === "all") {
    return activities;
  }

  const filterConfig = ACTIVITY_FILTERS.find(f => f.key === filter);
  if (!filterConfig?.types) {
    return activities;
  }

  return activities.filter(activity => filterConfig.types!.includes(activity.type));
}

/**
 * Check if an activity is clickable (navigable)
 */
export function isActivityClickable(activity: Activity): boolean {
  const clickableTypes: Activity["type"][] = ["invoice_created", "invoice_paid"];

  return clickableTypes.includes(activity.type) && !!activity.relatedId;
}

/**
 * Get navigation path for an activity
 */
export function getActivityNavigationPath(activity: Activity): string | null {
  if (!isActivityClickable(activity) || !activity.relatedId) {
    return null;
  }

  switch (activity.type) {
    case "invoice_created":
    case "invoice_paid":
      return `/billing/invoices/${activity.relatedId}`;
    case "service_activated":
      return `/subscriptions/${activity.relatedId}`;
    case "case_created":
    case "case_closed":
      return `/support/cases/${activity.relatedId}`;
    default:
      return null;
  }
}

/**
 * Format activity date for display
 */
export function formatActivityDate(date: string): string {
  try {
    const activityDate = new Date(date);
    const now = new Date();
    const diffInHours = (now.getTime() - activityDate.getTime()) / (1000 * 60 * 60);

    if (diffInHours < 1) {
      const diffInMinutes = Math.floor(diffInHours * 60);
      return diffInMinutes <= 1 ? "Just now" : `${diffInMinutes} minutes ago`;
    } else if (diffInHours < 24) {
      const hours = Math.floor(diffInHours);
      return `${hours} hour${hours === 1 ? "" : "s"} ago`;
    } else if (diffInHours < 48) {
      return "Yesterday";
    } else {
      return activityDate.toLocaleDateString("en-US", {
        month: "short",
        day: "numeric",
        year: activityDate.getFullYear() !== now.getFullYear() ? "numeric" : undefined,
      });
    }
  } catch {
    return "Unknown date";
  }
}

/**
 * Get activity icon gradient class
 */
export function getActivityIconGradient(activityType: Activity["type"]): string {
  const gradientMap: Record<Activity["type"], string> = {
    invoice_created: "from-blue-500 to-cyan-500",
    invoice_paid: "from-green-500 to-emerald-500",
    service_activated: "from-purple-500 to-pink-500",
    case_created: "from-yellow-500 to-orange-500",
    case_closed: "from-green-500 to-emerald-500",
  };

  return gradientMap[activityType] || "from-gray-500 to-slate-500";
}

/**
 * Truncate text to specified length
 */
export function truncateText(text: string, maxLength = 28): string {
  if (text.length <= maxLength) {
    return text;
  }
  return text.slice(0, Math.max(0, maxLength - 1)) + "…";
}

/**
 * Generate dashboard task suggestions based on summary data
 */
export function generateDashboardTasks(summary: {
  nextInvoice?: { id: number } | null;
  stats?: { unpaidInvoices?: number; openCases?: number };
}): Array<{ label: string; href: string }> {
  const tasks: Array<{ label: string; href: string }> = [];

  if (summary.nextInvoice) {
    tasks.push({
      label: "Pay upcoming invoice",
      href: "#attention",
    });
  }

  if (summary.stats?.unpaidInvoices && summary.stats.unpaidInvoices > 0) {
    tasks.push({
      label: "Review unpaid invoices",
      href: "/billing/invoices",
    });
  }

  if (summary.stats?.openCases && summary.stats.openCases > 0) {
    tasks.push({
      label: "Check support cases",
      href: "/support/cases",
    });
  }

  return tasks;
}

/**
 * Calculate dashboard loading progress
 */
export function calculateLoadingProgress(loadingStates: Record<string, boolean>): number {
  const states = Object.values(loadingStates);
  const completedCount = states.filter(loading => !loading).length;
  return Math.round((completedCount / states.length) * 100);
}