import { NavigationGroup, NavigationItem } from "./welcome-types.ts";

export type NavigationContext = "calendar" | "landlord" | "tenant" | "default";

function normalizePath(path: string): string {
  if (!path) return "/";

  const [pathname] = path.split(/[?#]/);
  if (!pathname || pathname === "/") return "/";

  return pathname.endsWith("/") ? pathname.slice(0, -1) : pathname;
}

/** Placeholder replaced at runtime with server or client calendar path for hydration-safe nav. */
export const CALENDAR_PATH_PLACEHOLDER = "__SERVER_CALENDAR_PATH__";

function getCurrentFinancialCalendarPath(date = new Date()): string {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, "0");
  return `/calendar/financial-calendar/${year}/${month}`;
}

export function resolveNavigationContext(
  currentRoute: string,
): NavigationContext {
  const route = normalizePath(currentRoute);

  if (route.startsWith("/calendar/")) return "calendar";
  if (route.startsWith("/landlord/")) return "landlord";
  if (route.startsWith("/tenant/")) return "tenant";

  return "default";
}

export function isNavigationItemActive(
  item: NavigationItem,
  currentRoute: string,
): boolean {
  if (item.isForm) return false;

  const route = normalizePath(currentRoute);
  const itemPath = normalizePath(item.path);

  if (route === itemPath) {
    return true;
  }

  if (item.matchPrefixes && item.matchPrefixes.length > 0) {
    return item.matchPrefixes.some((prefix) => {
      const normalizedPrefix = normalizePath(prefix);
      return route === normalizedPrefix ||
        route.startsWith(`${normalizedPrefix}/`);
    });
  }

  return false;
}

/**
 * Default navigation groups configuration.
 * Groups are filtered by current route context (calendar / landlord / tenant / default).
 */
export const defaultNavigationGroups: NavigationGroup[] = [
  {
    id: "auth",
    label: "Session",
    items: [
      {
        path: "/auth/login",
        label: "Sign In",
        requiresAuth: false,
        isForm: true,
        formAction: "/auth/login",
        formMethod: "get",
      },
      {
        path: "/auth/logout",
        label: "Logout",
        requiresAuth: true,
        isForm: true,
        formAction: "/auth/logout",
        formMethod: "post",
        onClick: () => {
          localStorage.setItem("lastClickedButton", "logout");
        },
      },
    ],
  },
  {
    id: "apps",
    label: "App Switch",
    items: [
      {
        path: CALENDAR_PATH_PLACEHOLDER,
        label: "Calendar",
        requiresAuth: true,
        matchPrefixes: ["/calendar/financial-calendar"],
      },
      {
        path: "/landlord/dashboard",
        label: "Landlord",
        requiresAuth: true,
      },
      {
        path: "/tenant/dashboard",
        label: "Tenant",
        requiresAuth: true,
      },
    ],
  },
  {
    id: "calendar",
    label: "Calendar",
    items: [
      {
        path: CALENDAR_PATH_PLACEHOLDER,
        label: "Financial Calendar",
        requiresAuth: true,
        matchPrefixes: ["/calendar/financial-calendar"],
      },
      {
        path: "/calendar/every-income",
        label: "Every Income",
        requiresAuth: true,
      },
      {
        path: "/calendar/budget-obligations",
        label: "Budget Obligations",
        requiresAuth: true,
      },
    ],
  },
  {
    id: "landlord",
    label: "Landlord",
    items: [
      { path: "/landlord/dashboard", label: "Dashboard", requiresAuth: true },
      { path: "/landlord/properties", label: "Properties", requiresAuth: true },
      { path: "/landlord/leases", label: "Leases", requiresAuth: true },
      { path: "/landlord/payments", label: "Payments", requiresAuth: true },
      {
        path: "/landlord/maintenance",
        label: "Maintenance",
        requiresAuth: true,
      },
      {
        path: "/landlord/applications",
        label: "Applications",
        requiresAuth: true,
      },
      { path: "/landlord/messages", label: "Messages", requiresAuth: true },
      { path: "/landlord/reminders", label: "Reminders", requiresAuth: true },
      { path: "/landlord/documents", label: "Documents", requiresAuth: true },
    ],
  },
  {
    id: "tenant",
    label: "Tenant",
    items: [
      { path: "/tenant/dashboard", label: "Dashboard", requiresAuth: true },
      { path: "/tenant/property", label: "Property", requiresAuth: true },
      { path: "/tenant/payments", label: "Payments", requiresAuth: true },
      {
        path: "/tenant/payment-methods",
        label: "Payment Methods",
        requiresAuth: true,
      },
      { path: "/tenant/maintenance", label: "Maintenance", requiresAuth: true },
      { path: "/tenant/messages", label: "Messages", requiresAuth: true },
      {
        path: "/tenant/applications",
        label: "Applications",
        requiresAuth: true,
      },
      { path: "/tenant/reminders", label: "Reminders", requiresAuth: true },
      { path: "/tenant/documents", label: "Documents", requiresAuth: true },
      { path: "/tenant/settings", label: "Settings", requiresAuth: true },
    ],
  },
  {
    id: "general",
    label: "General",
    items: [
      {
        path: "/",
        label: "Home",
        requiresAuth: false,
      },
      {
        path: "/user-profile",
        label: "Profile",
        requiresAuth: true,
      },
    ],
  },
];

const contextGroupOrder: Record<NavigationContext, string[]> = {
  default: ["auth", "apps", "general"],
  calendar: ["auth", "calendar", "apps", "general"],
  landlord: ["auth", "landlord", "apps", "general"],
  tenant: ["auth", "tenant", "apps", "general"],
};

/**
 * Get navigation groups filtered by authentication status and current route context.
 * serverCalendarPath: use when provided so server and client render the same calendar links (avoids hydration mismatch).
 */
export function getNavigationGroups(
  isLoggedIn: boolean,
  currentRoute: string,
  customGroups?: NavigationGroup[],
  serverCalendarPath?: string,
): NavigationGroup[] {
  const calendarPath = serverCalendarPath ?? getCurrentFinancialCalendarPath();
  const groups = customGroups || defaultNavigationGroups;
  const route = normalizePath(currentRoute);
  const context = resolveNavigationContext(route);
  const orderedGroupIds = contextGroupOrder[context];

  const substituteCalendarPath = (items: NavigationItem[]): NavigationItem[] =>
    items.map((item) =>
      item.path === CALENDAR_PATH_PLACEHOLDER
        ? { ...item, path: calendarPath }
        : item
    );

  return groups
    .filter((group) => {
      if (customGroups) return true;
      return orderedGroupIds.includes(group.id);
    })
    .sort((a, b) => {
      if (customGroups) return 0;
      return orderedGroupIds.indexOf(a.id) - orderedGroupIds.indexOf(b.id);
    })
    .map((group) => ({
      ...group,
      items: substituteCalendarPath(group.items).filter((item) => {
        if (item.requiresAuth && !isLoggedIn) {
          return false;
        }

        if (group.id === "auth") {
          if (item.path === "/auth/login" && isLoggedIn) {
            return false;
          }
          if (item.path === "/auth/logout" && !isLoggedIn) {
            return false;
          }
        }

        if (isNavigationItemActive(item, route)) {
          return false;
        }

        return true;
      }),
    }))
    .filter((group) => group.items.length > 0);
}