import type {
  DataAccessPolicy,
  DataAccessRule,
  DataAccessSection,
  DataVisibility,
  DataVisibilityScopes,
  SectionDataAccess,
} from '@mento/shared';
import {
  DATA_ACCESS_LEGACY_SCOPE,
  DATA_ACCESS_SECTIONS,
  migrateVisibilityToSectionAccess,
  parseDataAccessPolicy,
  sectionHasDataAccessLimits,
} from '@mento/shared';
import { canViewAllRecords } from '@mento/shared';
import type { Prisma } from '@prisma/client';
import type { Actor } from './record-scope';

function elevated(role: string | null | undefined): boolean {
  return canViewAllRecords(role);
}

export type SectionAccessContext = {
  section: SectionDataAccess;
  source: 'role' | 'override' | 'default';
};

function ownerIdList(
  rule: DataAccessRule,
  ctx: { userId: string; teamPeerIds: string[] | null },
): string[] {
  const ownerIds = new Set<string>();
  if (!rule.owners?.length) return [];
  if (rule.owners.includes('self')) ownerIds.add(ctx.userId);
  if (rule.owners.includes('team')) {
    const peers = ctx.teamPeerIds?.length ? ctx.teamPeerIds : [ctx.userId];
    for (const id of peers) ownerIds.add(id);
  }
  return [...ownerIds];
}

/** Resolve یک بخش: override کاربر بر نقش؛ وگرنه مهاجرت از visibility قدیمی. */
export function resolveSectionAccess(
  sectionKey: DataAccessSection,
  input: {
    role: string;
    rolePolicy?: unknown;
    override?: unknown;
    legacyVisibility?: DataVisibility | string | null;
    legacyScopes?: DataVisibilityScopes | null;
  },
): SectionAccessContext {
  if (elevated(input.role)) {
    return { section: { mode: 'all', rules: [] }, source: 'default' };
  }
  const override = parseDataAccessPolicy(input.override);
  if (override[sectionKey]) {
    return { section: override[sectionKey]!, source: 'override' };
  }
  const rolePolicy = parseDataAccessPolicy(input.rolePolicy);
  if (rolePolicy[sectionKey]) {
    return { section: rolePolicy[sectionKey]!, source: 'role' };
  }
  // فرم محدودهٔ نقش، بخشِ ننوشته را «بدون محدودیت» نشان می‌دهد.
  // اگر نقش حتی یک بخش ذخیره کرده باشد، بقیه نباید به دید قدیمی own/team برگردند.
  if (Object.keys(rolePolicy).length > 0) {
    return { section: { mode: 'all', rules: [] }, source: 'role' };
  }
  if (input.legacyVisibility != null || input.legacyScopes) {
    return {
      section: migrateVisibilityToSectionAccess(
        input.legacyVisibility,
        input.legacyScopes,
        DATA_ACCESS_LEGACY_SCOPE[sectionKey],
      ),
      source: 'default',
    };
  }
  return { section: { mode: 'all', rules: [] }, source: 'default' };
}

/** @deprecated */
export function resolveCustomersAccess(input: {
  role: string;
  rolePolicy?: unknown;
  override?: unknown;
  legacyVisibility?: DataVisibility | string | null;
  legacyScopes?: DataVisibilityScopes | null;
}): SectionAccessContext {
  return resolveSectionAccess('customers', input);
}

export function resolveAllSectionAccess(input: {
  role: string;
  rolePolicy?: unknown;
  override?: unknown;
  legacyVisibility?: DataVisibility | string | null;
  legacyScopes?: DataVisibilityScopes | null;
}): DataAccessPolicy {
  const out: DataAccessPolicy = {};
  for (const key of DATA_ACCESS_SECTIONS) {
    out[key] = resolveSectionAccess(key, input).section;
  }
  return out;
}

export function buildContactRuleWhere(
  rule: DataAccessRule,
  ctx: { userId: string; teamPeerIds: string[] | null },
): Prisma.PersonWhereInput | null {
  const and: Prisma.PersonWhereInput[] = [];
  const ids = ownerIdList(rule, ctx);
  if (rule.owners?.length) {
    if (!ids.length) return null;
    and.push(ids.length === 1 ? { ownerId: ids[0]! } : { ownerId: { in: ids } });
  }
  if (rule.groupIds?.length) {
    and.push({ groupLinks: { some: { groupId: { in: rule.groupIds } } } });
  }
  if (rule.sources?.length) {
    and.push({
      OR: [{ importSource: { in: rule.sources } }, { sourceRef: { in: rule.sources } }],
    });
  }
  if (rule.moods?.length) {
    and.push({ mood: { in: rule.moods } });
  }
  if (!and.length) return null;
  return and.length === 1 ? and[0]! : { AND: and };
}

function orParts<T>(parts: T[]): T | { OR: T[] } | { id: string } {
  if (!parts.length) return { id: '__no_access__' } as T & { id: string };
  return parts.length === 1 ? parts[0]! : { OR: parts };
}

export function customersPersonWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'customersAccess' | 'teamPeerIds'>,
): Prisma.PersonWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.customersAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.PersonWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const w = buildContactRuleWhere(rule, {
      userId: actor.userId,
      teamPeerIds: actor.teamPeerIds ?? null,
    });
    if (w) parts.push(w);
  }
  return orParts(parts);
}

export function customersCompanyWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'customersAccess' | 'teamPeerIds'>,
): Prisma.CompanyWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.customersAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.CompanyWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.CompanyWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push(ids.length === 1 ? { ownerId: ids[0]! } : { ownerId: { in: ids } });
    }
    if (rule.groupIds?.length) {
      and.push({ groupLinks: { some: { groupId: { in: rule.groupIds } } } });
    }
    if (rule.sources?.length) {
      and.push({
        OR: [{ importSource: { in: rule.sources } }, { sourceRef: { in: rule.sources } }],
      });
    }
    if (
      rule.moods?.length &&
      !rule.owners?.length &&
      !rule.groupIds?.length &&
      !rule.sources?.length
    ) {
      continue;
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return orParts(parts);
}

export function leadsDeepWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'leadsAccess' | 'teamPeerIds'>,
): Prisma.LeadWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.leadsAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.LeadWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.LeadWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push(ids.length === 1 ? { assigneeId: ids[0]! } : { assigneeId: { in: ids } });
    }
    if (rule.stageIds?.length) {
      and.push({ stageId: { in: rule.stageIds } });
    }
    if (rule.sources?.length) {
      and.push({
        OR: rule.sources.map((s) => ({
          source: { equals: s, mode: 'insensitive' as const },
        })),
      });
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return orParts(parts);
}

export function dealsDeepWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'salesAccess' | 'teamPeerIds'>,
): Prisma.DealWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.salesAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.DealWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.DealWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push({
        OR: [
          { ownerId: { in: ids } },
          { assignees: { some: { id: { in: ids } } } },
        ],
      });
    }
    if (rule.pipelineIds?.length) {
      and.push({ pipelineId: { in: rule.pipelineIds } });
    }
    if (rule.stageIds?.length) {
      and.push({ stageId: { in: rule.stageIds } });
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return orParts(parts);
}

export function activitiesDeepWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'activitiesAccess' | 'teamPeerIds'>,
): Prisma.ActivityWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.activitiesAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.ActivityWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.ActivityWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push({
        OR: [
          { assigneeId: { in: ids } },
          { assignees: { some: { id: { in: ids } } } },
          { participantIds: { hasSome: ids } },
        ],
      });
    }
    if (rule.boardIds?.length) {
      and.push({ boardId: { in: rule.boardIds } });
    }
    if (rule.stageIds?.length) {
      and.push({ stageId: { in: rule.stageIds } });
    }
    if (rule.typeIds?.length) {
      and.push({ typeDefId: { in: rule.typeIds } });
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return orParts(parts);
}

export function notesDeepWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'notesAccess' | 'teamPeerIds'>,
): Prisma.NoteWhereInput {
  const personalGate: Prisma.NoteWhereInput = {
    OR: [
      { visibility: { not: 'personal' } },
      { visibility: 'personal', authorId: actor.userId },
    ],
  };
  if (elevated(actor.role)) return personalGate;
  const section = actor.notesAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return personalGate;
  const parts: Prisma.NoteWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.NoteWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push({
        OR: [
          { authorId: { in: ids } },
          {
            deal: {
              OR: [
                { ownerId: { in: ids } },
                { assignees: { some: { id: { in: ids } } } },
              ],
            },
          },
          { person: { ownerId: { in: ids } } },
          { company: { ownerId: { in: ids } } },
        ],
      });
    }
    if (rule.sources?.length) {
      and.push({ noteType: { in: rule.sources } });
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return {
    AND: [personalGate, orParts(parts)],
  };
}

export function ticketsDeepWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'ticketsAccess' | 'teamPeerIds'>,
): Prisma.TicketWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.ticketsAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.TicketWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.TicketWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push({
        OR: [{ assigneeId: { in: ids } }, { reporterId: { in: ids } }],
      });
    }
    if (rule.sources?.length) {
      and.push({
        status: {
          in: rule.sources as Array<'open' | 'in_progress' | 'waiting' | 'resolved' | 'closed'>,
        },
      });
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return orParts(parts);
}

export function projectsDeepWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'projectsAccess' | 'teamPeerIds'>,
): Prisma.ProjectCardWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.projectsAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.ProjectCardWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.ProjectCardWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push({
        OR: [
          { ownerId: { in: ids } },
          { assignees: { some: { id: { in: ids } } } },
        ],
      });
    }
    if (rule.boardIds?.length) {
      and.push({ boardId: { in: rule.boardIds } });
    }
    if (rule.stageIds?.length) {
      and.push({ stageId: { in: rule.stageIds } });
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return orParts(parts);
}

export function routinesDeepWhere(
  actor: Pick<Actor, 'userId' | 'role' | 'routinesAccess' | 'teamPeerIds'>,
): Prisma.RoutineTaskWhereInput {
  if (elevated(actor.role)) return {};
  const section = actor.routinesAccess ?? { mode: 'all' as const, rules: [] };
  if (!sectionHasDataAccessLimits(section)) return {};
  const parts: Prisma.RoutineTaskWhereInput[] = [];
  for (const rule of section.rules ?? []) {
    const and: Prisma.RoutineTaskWhereInput[] = [];
    if (rule.owners?.length) {
      const ids = ownerIdList(rule, {
        userId: actor.userId,
        teamPeerIds: actor.teamPeerIds ?? null,
      });
      if (!ids.length) continue;
      and.push(ids.length === 1 ? { assigneeId: ids[0]! } : { assigneeId: { in: ids } });
    }
    if (rule.typeIds?.length) {
      and.push({ categoryId: { in: rule.typeIds } });
    }
    if (!and.length) continue;
    parts.push(and.length === 1 ? and[0]! : { AND: and });
  }
  return orParts(parts);
}

/** اتحاد شناسهٔ owners در قوانین؛ null = بدون محدودیت مالکی (یا mode=all) */
export function sectionOwnerIdUnion(
  section: SectionDataAccess | null | undefined,
  ctx: { userId: string; teamPeerIds: string[] | null },
): string[] | null {
  if (!sectionHasDataAccessLimits(section)) return null;
  const ids = new Set<string>();
  let sawOwnerRule = false;
  let sawNonOwnerRule = false;
  for (const rule of section?.rules ?? []) {
    if (rule.owners?.length) {
      sawOwnerRule = true;
      for (const id of ownerIdList(rule, ctx)) ids.add(id);
    } else if (rule.groupIds?.length || rule.sources?.length || rule.moods?.length ||
      rule.stageIds?.length || rule.pipelineIds?.length || rule.boardIds?.length ||
      rule.typeIds?.length) {
      sawNonOwnerRule = true;
    }
  }
  if (sawNonOwnerRule && !sawOwnerRule) return null;
  if (!sawOwnerRule) return null;
  return [...ids];
}

export function sectionNeedsTeamPeers(section: SectionDataAccess | null | undefined): boolean {
  if (!sectionHasDataAccessLimits(section)) return false;
  return (section?.rules ?? []).some((r) => r.owners?.includes('team'));
}

export function sanitizeDataAccessPolicyInput(raw: unknown): DataAccessPolicy {
  return parseDataAccessPolicy(raw);
}