import "server-only";

import { count, desc, eq } from "drizzle-orm";

import { getDb, type Database } from "@/db";
import { auditLog as auditLogTable, type AuditLogValue } from "@/db/schema";
import { securityLog } from "@/lib/security/http";

export const AUDIT_ACTIONS = [
  "guide.created",
  "guide.overview.saved",
  "guide.weapon.saved",
  "guide.artifact.saved",
  "guide.constellations.saved",
  "guide.team.saved",
  "guide.extra.created",
  "guide.extra.saved",
  "guide.extra.deleted",
  "guide.extra.reordered",
  "guide.trashed",
  "guide.restored",
  "guide.published",
  "guide.unpublished",
  "guide.permanently_deleted",
  "glossary_alias.created",
  "glossary_alias.deleted",
  "media.uploaded",
  "media.deleted",
  "admin_account.created",
  "admin_account.removed",
  "catalog_sync.requested",
  "catalog_sync.cancel_requested",
  "catalog_sync.completed",
  "catalog_sync.unchanged",
  "catalog_sync.cancelled",
  "catalog_sync.failed",
] as const;

export const AUDIT_TARGET_TYPES = [
  "guide",
  "extra_section",
  "glossary_alias",
  "media",
  "admin_account",
  "catalog_sync",
] as const;

export type AuditAction = (typeof AUDIT_ACTIONS)[number];
export type AuditTargetType = (typeof AUDIT_TARGET_TYPES)[number];
export type AuditMetadata = Record<string, AuditLogValue>;

export interface AuditActor {
  id: string;
  label: string;
}

export interface AuditLogInput {
  action: AuditAction;
  targetType: AuditTargetType;
  targetId: string;
  scope?: string;
  resultingVersion?: number;
  metadata?: AuditMetadata;
}

type AuditWriter = Pick<Database, "insert">;

export function auditActor(user: {
  id: string;
  name?: string | null;
  email?: string | null;
}): AuditActor {
  return {
    id: user.id,
    label: (user.name?.trim() || user.email?.trim() || user.id).slice(0, 160),
  };
}

export async function writeAuditLog(
  writer: AuditWriter,
  actor: AuditActor,
  event: AuditLogInput,
): Promise<void> {
  await writer.insert(auditLogTable).values({
    authorId: actor.id,
    author: actor.label,
    text: AUDIT_ACTION_LABELS[event.action],
    details: {
      target: {
        type: event.targetType,
        id: event.targetId,
      },
      ...(event.scope ? { scope: event.scope } : {}),
      ...(event.resultingVersion
        ? { version: event.resultingVersion }
        : {}),
      ...event.metadata,
    },
  });
}

export async function writeAuditLogBestEffort(
  actor: AuditActor,
  event: AuditLogInput,
): Promise<void> {
  try {
    await writeAuditLog(getDb(), actor, event);
  } catch {
    securityLog("audit-write-failed", {
      actorId: actor.id,
      targetId: event.targetId,
    });
  }
}

export interface AuditLogFilters {
  actorId?: string;
  page?: number;
  pageSize?: number;
}

export async function listAuditLogs(filters: AuditLogFilters = {}) {
  const page = Math.max(1, Math.floor(filters.page ?? 1));
  const pageSize = Math.max(1, Math.min(100, Math.floor(filters.pageSize ?? 50)));
  const where = filters.actorId
    ? eq(auditLogTable.authorId, filters.actorId)
    : undefined;
  const db = getDb();
  const [events, [total]] = await Promise.all([
    db
      .select()
      .from(auditLogTable)
      .where(where)
      .orderBy(desc(auditLogTable.time), desc(auditLogTable.id))
      .limit(pageSize)
      .offset((page - 1) * pageSize),
    db
      .select({ value: count() })
      .from(auditLogTable)
      .where(where),
  ]);
  return {
    events,
    page,
    pageSize,
    total: total.value,
    pageCount: Math.max(1, Math.ceil(total.value / pageSize)),
  };
}

export async function listAuditActors() {
  const rows = await getDb()
    .selectDistinctOn([auditLogTable.authorId], {
      id: auditLogTable.authorId,
      label: auditLogTable.author,
    })
    .from(auditLogTable)
    .orderBy(auditLogTable.authorId, desc(auditLogTable.id));
  const actors = rows.filter(
    (row): row is { id: string; label: string } =>
      Boolean(row.id && row.label),
  );
  return actors.sort((left, right) =>
    left.label.localeCompare(right.label, "th"),
  );
}

export const AUDIT_TARGET_LABELS: Record<
  AuditTargetType,
  string
> = {
  guide: "Guide",
  extra_section: "Extra section",
  glossary_alias: "Glossary",
  media: "Media",
  admin_account: "Admin account",
  catalog_sync: "Catalog sync",
};

export const AUDIT_ACTION_LABELS: Record<AuditAction, string> = {
  "guide.created": "สร้าง Guide",
  "guide.overview.saved": "บันทึก Overview",
  "guide.weapon.saved": "บันทึก Weapons",
  "guide.artifact.saved": "บันทึก Artifacts",
  "guide.constellations.saved": "บันทึก Constellations",
  "guide.team.saved": "บันทึก Team",
  "guide.extra.created": "สร้าง Extra section",
  "guide.extra.saved": "บันทึก Extra section",
  "guide.extra.deleted": "ลบ Extra section",
  "guide.extra.reordered": "เรียง Extra sections",
  "guide.trashed": "ย้าย Guide ไปถังขยะ",
  "guide.restored": "กู้คืน Guide",
  "guide.published": "เผยแพร่ Guide",
  "guide.unpublished": "ยกเลิกเผยแพร่ Guide",
  "guide.permanently_deleted": "ลบ Guide ถาวร",
  "glossary_alias.created": "เพิ่ม Glossary shortcut",
  "glossary_alias.deleted": "ลบ Glossary shortcut",
  "media.uploaded": "อัปโหลด Media",
  "media.deleted": "ลบ Media",
  "admin_account.created": "สร้างบัญชี Admin",
  "admin_account.removed": "ลบบัญชี Admin",
  "catalog_sync.requested": "เริ่ม Catalog sync",
  "catalog_sync.cancel_requested": "ขอยกเลิก Catalog sync",
  "catalog_sync.completed": "Catalog sync สำเร็จ",
  "catalog_sync.unchanged": "Catalog เป็นเวอร์ชันล่าสุด",
  "catalog_sync.cancelled": "ยกเลิก Catalog sync แล้ว",
  "catalog_sync.failed": "Catalog sync ล้มเหลว",
};

export function isAuditTargetType(
  value: string | undefined,
): value is AuditTargetType {
  return AUDIT_TARGET_TYPES.some((type) => type === value);
}