import { Grant, GrantEffect, GrantRole, GrantScopeType, GrantSubjectType } from '@dorfteich/shared';
import {
  GrantEffect as PrismaEffect,
  GrantRole as PrismaRole,
  GrantScopeType as PrismaScopeType,
  GrantSubjectType as PrismaSubjectType,
  RoleGrant,
} from '@prisma/client';

/**
 * Maps between the database's uppercase grant enums and the shared model's
 * lowercase strings (issue #51), so the resolution algorithm in
 * `@dorfteich/shared` sees one canonical shape regardless of storage.
 */

const SUBJECT_TO_DB: Record<GrantSubjectType, PrismaSubjectType> = {
  user: 'USER',
  authenticated: 'AUTHENTICATED',
  public: 'PUBLIC',
};
const ROLE_TO_DB: Record<GrantRole, PrismaRole> = {
  pond_admin: 'POND_ADMIN',
  editor: 'EDITOR',
  reader: 'READER',
};
const SCOPE_TO_DB: Record<GrantScopeType, PrismaScopeType> = {
  pond: 'POND',
  label: 'LABEL',
  page: 'PAGE',
};
const EFFECT_TO_DB: Record<GrantEffect, PrismaEffect> = { allow: 'ALLOW', deny: 'DENY' };

const SUBJECT_FROM_DB: Record<PrismaSubjectType, GrantSubjectType> = {
  USER: 'user',
  AUTHENTICATED: 'authenticated',
  PUBLIC: 'public',
};
const ROLE_FROM_DB: Record<PrismaRole, GrantRole> = {
  POND_ADMIN: 'pond_admin',
  EDITOR: 'editor',
  READER: 'reader',
};
const SCOPE_FROM_DB: Record<PrismaScopeType, GrantScopeType> = {
  POND: 'pond',
  LABEL: 'label',
  PAGE: 'page',
};
const EFFECT_FROM_DB: Record<PrismaEffect, GrantEffect> = { ALLOW: 'allow', DENY: 'deny' };

/** A stored grant row → the shared model shape. */
export function toGrant(row: RoleGrant): Grant {
  return {
    subjectType: SUBJECT_FROM_DB[row.subjectType],
    subjectId: row.subjectId,
    role: ROLE_FROM_DB[row.role],
    scopeType: SCOPE_FROM_DB[row.scopeType],
    scopeId: row.scopeId,
    effect: EFFECT_FROM_DB[row.effect],
  };
}

/** The shared grant shape → the Prisma enum columns (for writes). */
export function toGrantColumns(grant: Grant): {
  subjectType: PrismaSubjectType;
  subjectId: string | null;
  role: PrismaRole;
  scopeType: PrismaScopeType;
  scopeId: string | null;
  effect: PrismaEffect;
} {
  return {
    subjectType: SUBJECT_TO_DB[grant.subjectType],
    subjectId: grant.subjectId,
    role: ROLE_TO_DB[grant.role],
    scopeType: SCOPE_TO_DB[grant.scopeType],
    scopeId: grant.scopeId,
    effect: EFFECT_TO_DB[grant.effect],
  };
}