import { useEffect, useState } from "react";
import { Dialog, DialogContent, DialogHeader } from "../components/ui/dialog";
import { api } from "../utils/api";
import { useAuthStore } from "../stores/authStore";
import { Loader, X } from "lucide-react";

interface LessonModalProps {
  lessonId: string | null;
  open: boolean;
  onOpenChange: (open: boolean) => void;
}

const STYLES = `
  @import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;700;800;900&family=Nunito+Sans:wght@400;600;700&display=swap');

  /* Override Dialog defaults */
  .lm-content {
    font-family: 'Nunito', sans-serif;
    background: #fffbf4;
    border: 2.5px solid #f3f4f6;
    border-radius: 28px !important;
    padding: 0;
    overflow: hidden;
    max-width: 680px;
    width: calc(100vw - 2rem);
    box-shadow: 0 20px 60px rgba(0,0,0,0.12);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
  }

  /* Header bar */
  .lm-header {
    display: flex; align-items: flex-start; justify-content: space-between;
    padding: 1.25rem 1.5rem 0;
    flex-shrink: 0;
    gap: 1rem;
  }
  .lm-title-wrap { display:flex;flex-direction:column;gap:0.2rem; flex:1; }
  .lm-eyebrow {
    font-size: 0.62rem; font-weight: 800; letter-spacing: 0.16em;
    text-transform: uppercase; color: #a855f7;
  }
  .lm-title {
    font-size: 1.2rem; font-weight: 900; color: #1e1b4b;
    letter-spacing: -0.01em; line-height: 1.25;
  }
  .lm-close-btn {
    width: 34px; height: 34px; flex-shrink: 0;
    border-radius: 50%; border: 2.5px solid #f3f4f6;
    background: white; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: all 0.15s ease;
  }
  .lm-close-btn:hover { border-color: #fecdd3; background: #fff1f2; }

  /* Scrollable body */
  .lm-body {
    overflow-y: auto;
    flex: 1;
    padding: 1rem 1.5rem 1.5rem;
    display: flex; flex-direction: column; gap: 1rem;
    -webkit-overflow-scrolling: touch;
  }

  /* Video player */
  .lm-video {
    width: 100%; border-radius: 18px;
    aspect-ratio: 16/9; background: #1e1b4b;
    display: block;
  }

  /* Topic chip */
  .lm-topic-chip {
    display: inline-flex; align-items: center; gap: 0.4rem;
    background: #f3e8ff; border: 2px solid #e9d5ff;
    border-radius: 100px; padding: 0.3rem 0.8rem;
    font-size: 0.7rem; font-weight: 800;
    letter-spacing: 0.08em; text-transform: uppercase;
    color: #9333ea; width: fit-content;
  }

  /* Description & content cards */
  .lm-card {
    background: white; border: 2.5px solid #f3f4f6;
    border-radius: 18px; padding: 1rem 1.1rem;
    box-shadow: 0 3px 10px rgba(0,0,0,0.04);
  }
  .lm-card-label {
    font-size: 0.62rem; font-weight: 800; letter-spacing: 0.14em;
    text-transform: uppercase; color: #9ca3af; margin-bottom: 0.4rem;
  }
  .lm-card-text {
    font-family: 'Nunito Sans', sans-serif;
    font-size: 0.88rem; font-weight: 600; color: #374151;
    line-height: 1.6;
  }

  /* Loading state */
  .lm-loading {
    display: flex; flex-direction: column; align-items: center;
    justify-content: center; gap: 0.75rem;
    padding: 3rem 1.5rem;
    flex: 1;
  }
  .lm-loading-spinner { animation: lmSpin 0.8s linear infinite; }
  @keyframes lmSpin { to { transform: rotate(360deg); } }
  .lm-loading-text {
    font-size: 0.85rem; font-weight: 700; color: #9ca3af;
  }
`;

export const LessonModal = ({
  lessonId,
  open,
  onOpenChange,
}: LessonModalProps) => {
  const user = useAuthStore((state) => state.user);
  const [loading, setLoading] = useState(false);
  const [lesson, setLesson] = useState<any>(null);

  useEffect(() => {
    if (!open || !lessonId || !user) return;
    const fetchLesson = async () => {
      try {
        setLoading(true);
        const authStorage = localStorage.getItem("auth-storage");
        if (!authStorage) return;
        const {
          state: { token },
        } = JSON.parse(authStorage) as { state?: { token?: string } };
        if (!token) return;
        const response = await api.fetchLessonById(token, lessonId);
        setLesson(response);
      } catch (err) {
        console.error("Failed to fetch lesson", err);
      } finally {
        setLoading(false);
      }
    };
    fetchLesson();
  }, [open, lessonId, user]);

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <style>{STYLES}</style>
      <DialogContent className="lm-content" showCloseButton={false}>
        <DialogHeader style={{ display: "none" }} />

        {/* Header */}
        <div className="lm-header">
          <div className="lm-title-wrap">
            <span className="lm-eyebrow">📖 Lesson</span>
            <h2 className="lm-title">
              {loading ? "Loading..." : (lesson?.title ?? "Lesson details")}
            </h2>
          </div>
          <button className="lm-close-btn" onClick={() => onOpenChange(false)}>
            <X size={16} color="#6b7280" />
          </button>
        </div>

        {/* Body */}
        {loading ? (
          <div className="lm-loading">
            <Loader size={28} color="#a855f7" className="lm-loading-spinner" />
            <p className="lm-loading-text">Loading lesson...</p>
          </div>
        ) : (
          lesson && (
            <div className="lm-body">
              {lesson.video_url && (
                <video src={lesson.video_url} controls className="lm-video" />
              )}

              {lesson.topic?.name && (
                <div>
                  <span className="lm-topic-chip">
                    <span
                      style={{
                        width: 6,
                        height: 6,
                        borderRadius: "50%",
                        background: "#a855f7",
                        flexShrink: 0,
                      }}
                    />
                    {lesson.topic.name}
                  </span>
                </div>
              )}

              {lesson.description && (
                <div className="lm-card">
                  <p className="lm-card-label">About this lesson</p>
                  <p className="lm-card-text">{lesson.description}</p>
                </div>
              )}

              {lesson.content && (
                <div className="lm-card">
                  <p className="lm-card-label">Content</p>
                  <p className="lm-card-text">{lesson.content}</p>
                </div>
              )}
            </div>
          )
        )}
      </DialogContent>
    </Dialog>
  );
};