"use client";

import { useEffect, useState } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import axiosInstance from "@/lib/axiosInstance";
import { fmt12 } from "@/lib/timeslot-utils";

interface BookingRow {
  id: number;
  booking_date: string;
  start_time: string;
  end_time: string;
  schedule_id: number;
}

interface DashboardData {
  todaysClasses: BookingRow[];
  upcomingClasses: BookingRow[];
  nextClass: BookingRow | null;
  stats: {
    totalScheduled: number;
    upcomingCount: number;
    completedCount: number;
    pendingRequestsCount: number;
  };
}

const formatDateLabel = (dateKey: string) =>
  new Date(dateKey + "T00:00:00").toLocaleDateString(undefined, {
    weekday: "short",
    month: "short",
    day: "numeric",
  });

export default function Dashboard() {
  const router = useRouter();
  const [data, setData] = useState<DashboardData | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    loadDashboard();
  }, []);

  const loadDashboard = async () => {
    setLoading(true);
    try {
      const { data } = await axiosInstance.get("/student/dashboard");
      setData(data.data);
    } finally {
      setLoading(false);
    }
  };

  const handleLogout = async () => {
    try {
      const res = await fetch("/api/student/logout", { method: "POST" });
      const result = await res.json();
      if (result.success) {
        router.push("/student/login");
      }
    } catch (err) {
      console.log(err);
    }
  };

  return (
    <div className="dashboard-page">
      <div className="admin-page-wrapper">
        {/* <div className="admin-page-header mb-4">
          <div className="d-flex justify-content-between align-items-center">
            <div>
              <h2 className="admin-page-title">Student Dashboard</h2>
              <p className="admin-page-subtitle">Overview of class and schedule requests</p>
            </div>
            <button className="btn btn-light btn-sm" onClick={handleLogout}>
              <i className="bi bi-box-arrow-right me-1" />
              Logout
            </button>
          </div>
        </div> */}

        {/* Stat cards */}
        <div className="row g-4 mb-4">
          <div className="col-xl-3 col-lg-6 col-md-6">
            <Link href="/student/schedule" className="text-decoration-none">
              <div className="card stat-orb orb-indigo">
                <div className="card-body">
                  <div className="orb-icon">
                    <i className="bi bi-calendar-check" />
                  </div>
                  <div className="orb-value">{loading ? "—" : data?.stats.totalScheduled ?? 0}</div>
                  <div className="orb-label">Total Classes Scheduled</div>
                </div>
              </div>
            </Link>
          </div>

          <div className="col-xl-3 col-lg-6 col-md-6">
            <Link href="/student/schedule" className="text-decoration-none">
              <div className="card stat-orb orb-emerald">
                <div className="card-body">
                  <div className="orb-icon">
                    <i className="bi bi-calendar-event" />
                  </div>
                  <div className="orb-value">{loading ? "—" : data?.stats.upcomingCount ?? 0}</div>
                  <div className="orb-label">Upcoming Classes</div>
                </div>
              </div>
            </Link>
          </div>

          <div className="col-xl-3 col-lg-6 col-md-6">
            <Link href="/student/schedule" className="text-decoration-none">
              <div className="card stat-orb orb-amber">
                <div className="card-body">
                  <div className="orb-icon">
                    <i className="bi bi-check-circle" />
                  </div>
                  <div className="orb-value">{loading ? "—" : data?.stats.completedCount ?? 0}</div>
                  <div className="orb-label">Completed Classes</div>
                </div>
              </div>
            </Link>
          </div>

          <div className="col-xl-3 col-lg-6 col-md-6">
            <Link href="/student/schedule" className="text-decoration-none">
              <div className="card stat-orb orb-cyan">
                <div className="card-body">
                  <div className="orb-icon">
                    <i className="bi bi-hourglass-split" />
                  </div>
                  <div className="orb-value">{loading ? "—" : data?.stats.pendingRequestsCount ?? 0}</div>
                  <div className="orb-label">Pending Change Requests</div>
                </div>
              </div>
            </Link>
          </div>
        </div>

        <div className="row g-4">
          {/* Today's class */}
          <div className="col-lg-6">
            <div className="card-theme p-4 h-100">
              <h6 className="mb-3">Today's Class</h6>

              {loading && <p className="text-muted small mb-0">Loading...</p>}

              {!loading && (!data || data.todaysClasses.length === 0) && (
                <p className="text-muted small mb-0">No class scheduled for today.</p>
              )}

              {!loading &&
                data?.todaysClasses.map((c) => (
                  <div key={c.id} className="border rounded p-3 mb-2 d-flex justify-content-between align-items-center">
                    <div>
                      <p className="fw-semibold mb-0">{fmt12(c.start_time)} - {fmt12(c.end_time)}</p>
                      <p className="text-muted small mb-0">Today</p>
                    </div>
                    <span className="badge bg-primary-subtle text-primary">Today</span>
                  </div>
                ))}
            </div>
          </div>

          {/* Upcoming classes */}
          <div className="col-lg-6">
            <div className="card-theme p-4 h-100">
              <div className="d-flex justify-content-between align-items-center mb-3">
                <h6 className="mb-0">Upcoming Classes</h6>
                <Link href="/student/schedule" className="small">
                  View all
                </Link>
              </div>

              {loading && <p className="text-muted small mb-0">Loading...</p>}

              {!loading && (!data || data.upcomingClasses.length === 0) && (
                <p className="text-muted small mb-0">No upcoming classes.</p>
              )}

              {!loading &&
                data?.upcomingClasses.map((c) => (
                  <div key={c.id} className="border rounded p-2 mb-2 d-flex justify-content-between align-items-center">
                    <span className="small">{formatDateLabel(c.booking_date)}</span>
                    <span className="small fw-medium">
                      {fmt12(c.start_time)} - {fmt12(c.end_time)}
                    </span>
                  </div>
                ))}
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}