import { notFound } from "next/navigation";
import { requireUser } from "@/lib/auth/requireUser";
import CourseDetailHeader from "@/components/courses/CourseDetailHeader";
import CourseProgressCard from "@/components/courses/CourseProgressCard";
import ProgramContentList from "@/components/courses/ProgramContentList";
import { getCourseDetailViewModel } from "@/lib/courses/publicCourses";

export const dynamic = "force-dynamic";

type PageProps = {
  params: Promise<{ slug: string }>;
};

type DetailActionState = {
  primaryAction: {
    label: string;
    href?: string;
    disabled?: boolean;
  };
  secondaryAction?: {
    label: string;
    href?: string;
    disabled?: boolean;
  };
  helperText?: string;
};

function buildActionState(args: {
  slug: string;
  isAuthenticated: boolean;
  isEnrolled: boolean;
  availabilityState: "published" | "upcoming" | "draft";
  progressPercent: number;
  firstPreviewLessonId: string | null;
  price: number;
}): DetailActionState {
  const learnUrl = `/courses/${args.slug}/learn`;
  const loginUrl = `/auth/login?redirectTo=${encodeURIComponent(`/courses/${args.slug}`)}`;
  const previewUrl = args.firstPreviewLessonId ? `${learnUrl}?lesson=${args.firstPreviewLessonId}` : undefined;

  if (args.availabilityState !== "published") {
    return {
      primaryAction: {
        label: "Próximamente",
        disabled: true,
      },
      helperText: "Este programa se encuentra en preparación editorial y estará habilitado en próximas publicaciones.",
    };
  }

  if (args.isAuthenticated && args.isEnrolled) {
    const label = args.progressPercent >= 100 ? "Revisar programa" : args.progressPercent > 0 ? "Continuar" : "Comenzar";
    return {
      primaryAction: {
        label,
        href: learnUrl,
      },
      helperText:
        args.progressPercent > 0
          ? "Tu avance se conserva automáticamente. Puedes continuar desde la lección más reciente."
          : "Inicia el recorrido académico desde el primer módulo.",
    };
  }

  if (args.isAuthenticated) {
    if (args.price <= 0) {
      return {
        primaryAction: {
          label: "Comenzar",
          href: learnUrl,
        },
        helperText: "Programa con acceso abierto para iniciar de inmediato.",
      };
    }

    if (previewUrl) {
      return {
        primaryAction: {
          label: "Ver clase de muestra",
          href: previewUrl,
        },
        helperText: "El contenido completo está disponible para estudiantes inscritos en el programa.",
      };
    }

    return {
      primaryAction: {
        label: "Inscripción próximamente",
        disabled: true,
      },
      helperText: "La inscripción completa para este programa estará disponible en breve.",
    };
  }

  if (previewUrl) {
    return {
      primaryAction: {
        label: "Ver clase de muestra",
        href: previewUrl,
      },
      secondaryAction: {
        label: "Iniciar sesión",
        href: loginUrl,
      },
      helperText: "Puedes revisar una vista previa o iniciar sesión para gestionar tu itinerario académico.",
    };
  }

  return {
    primaryAction: {
      label: "Iniciar sesión para comenzar",
      href: loginUrl,
    },
    helperText: "Accede con tu cuenta para comenzar este programa y registrar tu progreso.",
  };
}

export default async function CourseDetailPage({ params }: PageProps) {
  const { slug } = await params;
  const user = await requireUser().catch(() => null);

  const course = await getCourseDetailViewModel(slug, user?.id ?? null);
  if (!course) notFound();

  const actions = buildActionState({
    slug: course.slug,
    isAuthenticated: Boolean(user?.id),
    isEnrolled: course.isEnrolled,
    availabilityState: course.availabilityState,
    progressPercent: course.progressPercent,
    firstPreviewLessonId: course.firstPreviewLessonId,
    price: course.price,
  });

  return (
    <div className="acve-page">
      <section className="grid items-start gap-5 xl:grid-cols-[1.55fr_0.95fr]">
        <CourseDetailHeader
          availabilityLabel={course.availabilityLabel}
          availabilityState={course.availabilityState}
          description={course.longDescription}
          durationLabel={course.durationLabel}
          instructor={course.instructor}
          lessonCount={course.lessonCount}
          proficiencyLabel={course.proficiencyLabel}
          stageLabel={course.stage.levelLabel}
          studentsCount={course.studentsCount}
          thumbnailUrl={course.thumbnailUrl}
          title={course.title}
        />

        <CourseProgressCard
          availabilityLabel={course.availabilityLabel}
          completedLessons={course.completedLessons}
          durationLabel={course.durationLabel}
          helperText={actions.helperText}
          instructor={course.instructor}
          primaryAction={actions.primaryAction}
          progressPercent={course.progressPercent}
          secondaryAction={actions.secondaryAction}
          stageLabel={course.stage.levelLabel}
          totalLessons={course.totalLessons}
        />
      </section>

      <ProgramContentList modules={course.modules} />
    </div>
  );
}