import {
  IconDatabaseExport,
  IconServer2,
  IconShieldLock,
} from "@tabler/icons-react";
import { desc, eq } from "drizzle-orm";
import { redirect } from "next/navigation";
import { Suspense } from "react";
import { TmdbLogo } from "@/components/tmdb-logo";
import { Card } from "@/components/ui/card";
import { getSession } from "@/lib/auth/session";
import { db } from "@/lib/db/client";
import { integrationEvents, integrations } from "@/lib/db/schema";
import { listBackups } from "@/lib/services/backup";
import { getSetting } from "@/lib/services/settings";
import { getSystemHealth } from "@/lib/services/system-health";
import {
  getCachedUpdateCheck,
  isUpdateCheckEnabled,
} from "@/lib/services/update-check";
import { AccountSection } from "./_components/account-section";
import { BackupRestoreSection } from "./_components/backup-restore-section";
import { BackupScheduleSection } from "./_components/backup-schedule-section";
import { BackupSection } from "./_components/backup-section";
import { IntegrationsSection } from "./_components/integrations-section";
import { RegistrationSection } from "./_components/registration-section";
import { SettingsShell } from "./_components/settings-shell";
import {
  SkeletonCards,
  SystemHealthCards,
} from "./_components/system-health-section";
import { UpdateCheckSection } from "./_components/update-check-section";

export default async function SettingsPage() {
  const session = await getSession();
  if (!session?.user) redirect("/login");

  const isAdmin = session.user.role === "admin";

  const connRows = db
    .select()
    .from(integrations)
    .where(eq(integrations.userId, session.user.id))
    .all();

  const connIds = connRows.map((c) => c.id);

  // Fetch only the 10 most recent events per connection (index-optimized)
  const eventsByConn = new Map<
    string,
    (typeof integrationEvents.$inferSelect)[]
  >();
  for (const connId of connIds) {
    const events = db
      .select()
      .from(integrationEvents)
      .where(eq(integrationEvents.integrationId, connId))
      .orderBy(desc(integrationEvents.receivedAt))
      .limit(10)
      .all();
    eventsByConn.set(connId, events);
  }

  const connections = connRows.map((conn) => ({
    id: conn.id,
    provider: conn.provider,
    type: conn.type,
    token: conn.token,
    enabled: conn.enabled,
    lastEventAt: conn.lastEventAt?.toISOString() ?? null,
    recentEvents: (eventsByConn.get(conn.id) ?? []).map((e) => ({
      id: e.id,
      eventType: e.eventType,
      mediaType: e.mediaType,
      mediaTitle: e.mediaTitle,
      status: e.status,
      receivedAt: e.receivedAt.toISOString(),
    })),
  }));

  const registrationOpen = isAdmin
    ? getSetting("registrationOpen") === "true"
    : false;

  const backups = isAdmin ? await listBackups() : [];
  const scheduledBackupsEnabled = isAdmin
    ? getSetting("scheduledBackups") === "true"
    : false;
  const maxBackupRetention = isAdmin
    ? Number.parseInt(getSetting("maxBackupRetention") ?? "7", 10)
    : 7;
  const backupFrequency = isAdmin
    ? (getSetting("backupScheduleFrequency") ?? "1d")
    : "1d";
  const backupTime = isAdmin
    ? (getSetting("backupScheduleTime") ?? "02:00")
    : "02:00";
  const backupDow = isAdmin
    ? Number.parseInt(getSetting("backupScheduleDow") ?? "0", 10)
    : 0;

  const updateCheckEnabled = isAdmin ? isUpdateCheckEnabled() : true;
  const updateCheck =
    isAdmin && updateCheckEnabled ? getCachedUpdateCheck() : null;

  const GITHUB_REPO = "jakejarvis/sofa";
  const APP_VERSION = process.env.APP_VERSION || "0.0.0";
  const GIT_COMMIT_SHA = process.env.GIT_COMMIT_SHA?.slice(0, 7) || "";

  return (
    <SettingsShell
      footer={
        <footer className="border-border/50 border-t pt-6 pb-2 text-center text-muted-foreground text-xs">
          <p>
            <a
              href={`https://github.com/${GITHUB_REPO}`}
              target="_blank"
              rel="noopener noreferrer"
              className="font-medium text-primary/80 transition-colors hover:text-primary"
            >
              Sofa
            </a>{" "}
            v{APP_VERSION}
            {GIT_COMMIT_SHA && (
              <>
                {" "}
                (
                <a
                  href={`https://github.com/${GITHUB_REPO}/commit/${GIT_COMMIT_SHA}`}
                  target="_blank"
                  rel="noopener noreferrer"
                  className="font-mono transition-colors hover:text-primary"
                >
                  {GIT_COMMIT_SHA}
                </a>
                )
              </>
            )}
            {updateCheck?.updateAvailable && (
              <span className="ml-1.5 inline-flex items-center gap-1 rounded-full bg-primary/15 px-2 py-0.5 font-medium text-[10px] text-primary">
                <span className="relative flex h-1.5 w-1.5">
                  <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-primary opacity-75" />
                  <span className="relative inline-flex h-1.5 w-1.5 rounded-full bg-primary" />
                </span>
                <a
                  href={
                    updateCheck.releaseUrl ??
                    `https://github.com/${GITHUB_REPO}/releases`
                  }
                  target="_blank"
                  rel="noopener noreferrer"
                  className="hover:underline"
                >
                  v{updateCheck.latestVersion} available
                </a>
              </span>
            )}
          </p>
          <div className="mt-4 flex flex-col items-center gap-2">
            <a
              href="https://www.themoviedb.org/"
              target="_blank"
              rel="noopener noreferrer"
              className="transition-opacity hover:opacity-70"
            >
              <TmdbLogo className="h-3" />
            </a>
            <p className="text-[10px] text-muted-foreground leading-relaxed">
              This product uses the TMDB API but is not endorsed or certified by
              TMDB.
            </p>
          </div>
        </footer>
      }
    >
      <AccountSection
        user={{
          name: session.user.name,
          email: session.user.email,
          image: session.user.image || undefined,
          createdAt: session.user.createdAt.toISOString(),
          role: session.user.role ?? undefined,
        }}
      />
      <IntegrationsSection initialConnections={connections} />
      {isAdmin && (
        <>
          {/* Server health */}
          <div>
            <div className="mb-3 flex items-center gap-2">
              <IconServer2
                aria-hidden={true}
                className="size-4 text-muted-foreground"
              />
              <h2 className="font-medium text-muted-foreground text-xs uppercase tracking-wider">
                Server
              </h2>
              <span className="rounded-md bg-primary/10 px-1.5 py-0.5 font-medium text-[10px] text-primary">
                Admin only
              </span>
            </div>
            <Suspense fallback={<SkeletonCards />}>
              <SystemHealthLoader />
            </Suspense>
          </div>

          {/* Security */}
          <div>
            <div className="mb-3 flex items-center gap-2">
              <IconShieldLock
                aria-hidden={true}
                className="size-4 text-muted-foreground"
              />
              <h2 className="font-medium text-muted-foreground text-xs uppercase tracking-wider">
                Security
              </h2>
              <span className="rounded-md bg-primary/10 px-1.5 py-0.5 font-medium text-[10px] text-primary">
                Admin only
              </span>
            </div>
            <div className="space-y-3">
              <Card className="border-l-2 border-l-primary/30">
                <RegistrationSection
                  initialRegistrationOpen={registrationOpen}
                />
              </Card>
              <Card className="border-l-2 border-l-primary/30">
                <UpdateCheckSection initialEnabled={updateCheckEnabled} />
              </Card>
            </div>
          </div>

          {/* Backups */}
          <div>
            <div className="mb-3 flex items-center gap-2">
              <IconDatabaseExport
                aria-hidden={true}
                className="size-4 text-muted-foreground"
              />
              <h2 className="font-medium text-muted-foreground text-xs uppercase tracking-wider">
                Backups
              </h2>
              <span className="rounded-md bg-primary/10 px-1.5 py-0.5 font-medium text-[10px] text-primary">
                Admin only
              </span>
            </div>
            <div className="space-y-3">
              <Card className="border-l-2 border-l-primary/30">
                <BackupSection initialBackups={backups} />
              </Card>
              <Card className="border-l-2 border-l-primary/30">
                <BackupScheduleSection
                  initialScheduledEnabled={scheduledBackupsEnabled}
                  initialMaxRetention={maxBackupRetention}
                  initialFrequency={
                    backupFrequency as "6h" | "12h" | "1d" | "7d"
                  }
                  initialTime={backupTime}
                  initialDow={backupDow}
                />
              </Card>
              <Card className="border-l-2 border-l-primary/30">
                <BackupRestoreSection />
              </Card>
            </div>
          </div>
        </>
      )}
    </SettingsShell>
  );
}

async function SystemHealthLoader() {
  const data = await getSystemHealth();
  return <SystemHealthCards initialData={data} />;
}