import { eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { app_settings } from "@/lib/db/schema"

const MAINTENANCE_KEY = "maintenance_mode"

export type MaintenanceState = {
  enabled: boolean
  message: string | null
}

const DEFAULT_MAINTENANCE: MaintenanceState = { enabled: false, message: null }

/**
 * Reads the site maintenance-mode flag from app_settings.
 *
 * Fails OPEN: any DB/read error returns "disabled" so a database hiccup can
 * never accidentally lock the entire site (including admins) out. This is
 * called from the marketing + dashboard layouts on navigation.
 */
export async function getMaintenanceMode(): Promise<MaintenanceState> {
  try {
    const row = await db.query.app_settings.findFirst({
      where: eq(app_settings.key, MAINTENANCE_KEY),
    })
    if (!row) return DEFAULT_MAINTENANCE
    const v = row.value as Partial<MaintenanceState> | null
    return {
      enabled: Boolean(v?.enabled),
      message: typeof v?.message === "string" && v.message.trim() ? v.message : null,
    }
  } catch {
    return DEFAULT_MAINTENANCE
  }
}

/** Upserts the site maintenance-mode flag. Admin-gated by the calling action. */
export async function setMaintenanceMode(state: MaintenanceState): Promise<void> {
  await db
    .insert(app_settings)
    .values({ key: MAINTENANCE_KEY, value: state })
    .onConflictDoUpdate({
      target: app_settings.key,
      set: { value: state, updated_at: new Date().toISOString() },
    })
}