import { z } from 'zod';

import type { BackupStatus, RestoreStatus } from './backup-status';

/**
 * Site-Admin system panel (issue #86): maintenance jobs, backup status,
 * audit trail, and storage overview — the operator's single glance for
 * instance health (operations.md §Maintenance jobs).
 */

export interface SystemJobView {
  name: string;
  cadenceSeconds: number;
  status: 'IDLE' | 'RUNNING' | 'FAILED';
  lastRunAt: string | null;
  lastDurationMs: number | null;
  lastError: string | null;
  /** False for a database row whose job no longer registers in this build. */
  registered: boolean;
}

export type JobTriggerOutcome = 'succeeded' | 'failed' | 'already_running';

export interface JobTriggerResult {
  outcome: JobTriggerOutcome;
  job: SystemJobView;
}

export interface SystemBackupView {
  /** False when no status.json exists (sidecar never ran / not deployed). */
  available: boolean;
  /** Freshness verdict mirroring the readyz `backup` check (issue #85). */
  fresh: boolean;
  status: BackupStatus | null;
  maxAgeHours: number;
  /** Whether a Nextcloud target is fully configured (issue #103). */
  remoteConfigured: boolean;
  /** Progress/result of the last in-app restore, if any (issue #103). */
  restore: RestoreStatus | null;
}

/**
 * Backup configuration surface of the admin settings page (issue #103).
 * The app password is write-only: the view only says whether one is stored.
 */
export interface BackupSettingsView {
  localRetentionDays: number | null;
  remoteRetentionDays: number;
  /**
   * Deploy-level target policy (issue #192, ADR 0026): `allowed` is false
   * when `BACKUP_ALLOWED_TARGETS` is empty — remote targets are then
   * UNAVAILABLE by policy, which the UI must distinguish from merely
   * unconfigured. `allowlist` lets the admin see which hosts qualify.
   */
  remoteTargets: { allowed: boolean; allowlist: string[] };
  nextcloud: {
    enabled: boolean;
    baseUrl: string;
    username: string;
    folder: string;
    uploadSchedule: 'off' | 'daily' | 'weekly';
    passwordSet: boolean;
  };
}

export const backupSettingsInputSchema = z.object({
  /** `null` = no override; the sidecar's env value stays authoritative. */
  localRetentionDays: z.number().int().min(1).max(3650).nullable(),
  remoteRetentionDays: z.number().int().min(1).max(3650),
  nextcloud: z.object({
    enabled: z.boolean(),
    baseUrl: z.string().trim().url({ message: 'validation.url' }).or(z.literal('')),
    username: z.string().trim().max(200),
    folder: z.string().trim().min(1).max(500),
    uploadSchedule: z.enum(['off', 'daily', 'weekly']),
    /** Empty or omitted = keep the stored app password. */
    password: z.string().max(500).optional(),
  }),
});

export type BackupSettingsInput = z.infer<typeof backupSettingsInputSchema>;

export const backupConnectionTestInputSchema = z.object({
  baseUrl: z.string().trim().url({ message: 'validation.url' }),
  username: z.string().trim().min(1).max(200),
  folder: z.string().trim().min(1).max(500),
  /** Empty or omitted = test with the stored app password. */
  password: z.string().max(500).optional(),
});

export type BackupConnectionTestInput = z.infer<typeof backupConnectionTestInputSchema>;

export interface BackupConnectionTestResult {
  ok: boolean;
  /** Raw transport/server error for the admin, like the SMTP test (#80). */
  error?: string;
}

/** One restorable set as offered in the restore picker (issue #103). */
export interface BackupSetView {
  backupId: string;
  /** UTC run start derived from the backup id. */
  startedAt: string;
  /** Bundle size (remote) or dump+archive sum (local); null when unknown. */
  sizeBytes: number | null;
}

export interface BackupSetsView {
  local: BackupSetView[];
  remoteConfigured: boolean;
  remote: BackupSetView[];
  /** Present when a configured remote target could not be listed. */
  remoteError?: string;
}

export const backupIdSchema = z.string().regex(/^\d{8}-\d{6}$/);

export const backupRestoreInputSchema = z.object({
  source: z.enum(['local', 'remote']),
  backupId: backupIdSchema,
  /** Type-to-confirm safety: must repeat the backup id verbatim. */
  confirm: z.string(),
});

export type BackupRestoreInput = z.infer<typeof backupRestoreInputSchema>;

/** Response of the public, maintenance-exempt restore status endpoint. */
export type RestoreStatusResponse = { state: 'idle' } | RestoreStatus;

export interface AuditActorView {
  id: string;
  username: string;
  displayName: string;
}

export interface AuditEntryView {
  id: string;
  at: string;
  action: string;
  actor: AuditActorView | null;
  targetType: string | null;
  targetId: string | null;
  details: Record<string, unknown> | null;
}

export const AUDIT_PAGE_SIZE = 50;

export const auditListQuerySchema = z.object({
  /** Exact username of the acting user. */
  actor: z.string().trim().min(1).optional(),
  /** Action id or prefix, e.g. `grant.` matches created and deleted. */
  action: z.string().trim().min(1).optional(),
  from: z.coerce.date().optional(),
  to: z.coerce.date().optional(),
  page: z.coerce.number().int().min(1).default(1),
});

export type AuditListQuery = z.infer<typeof auditListQuerySchema>;

export interface AuditListView {
  entries: AuditEntryView[];
  page: number;
  pageCount: number;
  total: number;
}

/**
 * Site-Admin query path over the read-access trail (issue #224, ADR 0023) —
 * evidence nobody can read is not evidence. Answers the two expected
 * questions: "who read page X" (pageId) and "what did user Y read" (actor),
 * both within a period.
 */
export const READ_EVENT_PAGE_SIZE = 50;

export const readEventListQuerySchema = z.object({
  /** Page id the events belong to. */
  pageId: z.string().trim().min(1).optional(),
  /** Exact username of the reading user. */
  actor: z.string().trim().min(1).optional(),
  channel: z.string().trim().min(1).optional(),
  from: z.coerce.date().optional(),
  to: z.coerce.date().optional(),
  page: z.coerce.number().int().min(1).default(1),
});

export type ReadEventListQuery = z.infer<typeof readEventListQuerySchema>;

export interface ReadEventView {
  id: string;
  occurredAt: string;
  actor: AuditActorView | null;
  /** Null for pond-level attachments (no page); the details name the file. */
  pageId: string | null;
  pondId: string;
  channel: string;
  classification: string;
  /** Seconds the event's dedup window spans (#223) — the row represents up
   * to this much access time, not a single request. */
  windowSeconds: number;
  details: Record<string, unknown> | null;
}

export interface ReadEventListView {
  entries: ReadEventView[];
  page: number;
  pageCount: number;
  total: number;
}

export interface StoragePondView {
  pondId: string;
  name: string;
  slug: string;
  /** Lowercase like PondView's `type` (the api's wire convention). */
  type: 'personal' | 'shared';
  storageBytesUsed: number;
}

export interface StorageOverviewView {
  totalBytes: number;
  /** Top ponds by storage use, largest first. */
  ponds: StoragePondView[];
}