// Cross-origin API client. All requests send the session cookie (connect.sid)
// via credentials: "include". The API origin comes from NEXT_PUBLIC_API_ORIGIN.

import type {
  AuthUser,
  BalanceFilter,
  BalanceListResponse,
  BalanceSort,
  BankCleared,
  BankDirection,
  BankFacets,
  BankListResponse,
  BankSort,
  BankStats,
  BankSummary,
  BillingFacets,
  BillingStats,
  BusinessLine,
  CreateBankMovementInput,
  CreateMovementInput,
  CustomerDetail,
  CustomerInput,
  CustomerListResponse,
  CustomerStats,
  LedgerCurrency,
  LedgerDirection,
  MovementListResponse,
  MovementSort,
  PolicyDetail,
  PolicyFacets,
  PolicyInput,
  PolicyListResponse,
  PolicySort,
  PolicyStats,
  PolicyStatus,
  LookupsResponse,
  OpsJob,
  OpsJobKind,
  IngestFile,
  BackupFile,
  PropertyDetail,
  PropertyFacets,
  PropertyInput,
  PropertyListResponse,
  PropertySort,
  PropertyStats,
  ServiceInput,
  TrustInput,
  Role,
  ServiceKind,
  Statement,
  Transaction,
  TransactionDomain,
  TrustFilter,
  UserRow,
} from "./types";

// Resolve the API origin at runtime, not build time. In the browser it comes
// from window.__API_ORIGIN__, injected server-side by the root layout from the
// deploy .env (API_ORIGIN) — so one built image serves any deployment. On the
// server (SSR) read process.env directly. NEXT_PUBLIC_API_ORIGIN stays as the
// dev/build fallback.
function resolveApiOrigin(): string {
  if (typeof window !== "undefined") {
    const injected = (window as { __API_ORIGIN__?: string }).__API_ORIGIN__;
    if (injected) return injected;
  }
  return (
    process.env.API_ORIGIN ??
    process.env.NEXT_PUBLIC_API_ORIGIN ??
    "http://localhost:3001"
  );
}

export const API_ORIGIN = resolveApiOrigin();

export class ApiError extends Error {
  status: number;
  constructor(status: number, message: string) {
    super(message);
    this.status = status;
    this.name = "ApiError";
  }
}

async function apiFetch<T>(
  path: string,
  init?: RequestInit,
): Promise<T> {
  let res: Response;
  try {
    res = await fetch(`${API_ORIGIN}${path}`, {
      credentials: "include",
      headers: {
        "Content-Type": "application/json",
        ...(init?.headers ?? {}),
      },
      ...init,
    });
  } catch (e) {
    throw new ApiError(
      0,
      "No se pudo conectar con el servidor. Verifica tu conexión.",
    );
  }

  if (!res.ok) {
    let message = `Error ${res.status}`;
    try {
      const body = await res.json();
      if (body?.message) message = body.message;
    } catch {
      /* ignore non-JSON error bodies */
    }
    throw new ApiError(res.status, message);
  }

  if (res.status === 204) return undefined as T;
  return (await res.json()) as T;
}

export function login(email: string, password: string): Promise<AuthUser> {
  return apiFetch<AuthUser>("/auth/login", {
    method: "POST",
    body: JSON.stringify({ email, password }),
  });
}

export function me(): Promise<AuthUser> {
  return apiFetch<AuthUser>("/auth/me");
}

export function logout(): Promise<{ success: boolean }> {
  return apiFetch<{ success: boolean }>("/auth/logout", { method: "POST" });
}

export function getStats(): Promise<CustomerStats> {
  return apiFetch<CustomerStats>("/customers/stats");
}

export interface CustomerQuery {
  query?: string;
  page?: number;
  pageSize?: number;
  line?: BusinessLine;
}

export function listCustomers(
  q: CustomerQuery,
): Promise<CustomerListResponse> {
  const params = new URLSearchParams();
  if (q.query) params.set("query", q.query);
  if (q.page) params.set("page", String(q.page));
  if (q.pageSize) params.set("pageSize", String(q.pageSize));
  if (q.line) params.set("line", q.line);
  const qs = params.toString();
  return apiFetch<CustomerListResponse>(`/customers${qs ? `?${qs}` : ""}`);
}

export function getCustomer(id: string): Promise<CustomerDetail> {
  return apiFetch<CustomerDetail>(`/customers/${id}`);
}

export function createCustomer(input: CustomerInput): Promise<CustomerDetail> {
  return apiFetch<CustomerDetail>("/customers", {
    method: "POST",
    body: JSON.stringify(input),
  });
}

export function updateCustomer(
  id: string,
  input: Partial<CustomerInput>,
): Promise<CustomerDetail> {
  return apiFetch<CustomerDetail>(`/customers/${id}`, {
    method: "PATCH",
    body: JSON.stringify(input),
  });
}

export function archiveCustomer(id: string): Promise<CustomerDetail> {
  return apiFetch<CustomerDetail>(`/customers/${id}`, { method: "DELETE" });
}

export function restoreCustomer(id: string): Promise<CustomerDetail> {
  return apiFetch<CustomerDetail>(`/customers/${id}/restore`, { method: "POST" });
}

/* ------------------------------------------------------ Policies module */

/** Renewal horizon in days, shared by the list, stats and detail calls so the
 *  "por vencer" bucket means the same thing everywhere. */
export const EXPIRY_WINDOW_DAYS = 30;

export interface PolicyQuery {
  query?: string;
  page?: number;
  pageSize?: number;
  status?: PolicyStatus;
  days?: number;
  typeId?: string;
  providerId?: string;
  liquidated?: boolean;
  sort?: PolicySort;
}

export function listPolicies(q: PolicyQuery): Promise<PolicyListResponse> {
  const params = new URLSearchParams();
  if (q.query) params.set("query", q.query);
  if (q.page) params.set("page", String(q.page));
  if (q.pageSize) params.set("pageSize", String(q.pageSize));
  if (q.status) params.set("status", q.status);
  if (q.days) params.set("days", String(q.days));
  if (q.typeId) params.set("typeId", q.typeId);
  if (q.providerId) params.set("providerId", q.providerId);
  if (q.liquidated !== undefined) params.set("liquidated", String(q.liquidated));
  if (q.sort) params.set("sort", q.sort);
  const qs = params.toString();
  return apiFetch<PolicyListResponse>(`/policies${qs ? `?${qs}` : ""}`);
}

export function getPolicyStats(
  days: number = EXPIRY_WINDOW_DAYS,
): Promise<PolicyStats> {
  return apiFetch<PolicyStats>(`/policies/stats?days=${days}`);
}

export function getPolicyFacets(): Promise<PolicyFacets> {
  return apiFetch<PolicyFacets>("/policies/facets");
}

export function getPolicy(
  id: string,
  days: number = EXPIRY_WINDOW_DAYS,
): Promise<PolicyDetail> {
  return apiFetch<PolicyDetail>(`/policies/${id}?days=${days}`);
}

export function createPolicy(input: PolicyInput): Promise<PolicyDetail> {
  return apiFetch<PolicyDetail>("/policies", {
    method: "POST",
    body: JSON.stringify(input),
  });
}
export function updatePolicy(
  id: string,
  input: Partial<PolicyInput>,
): Promise<PolicyDetail> {
  return apiFetch<PolicyDetail>(`/policies/${id}`, {
    method: "PATCH",
    body: JSON.stringify(input),
  });
}
export function archivePolicy(id: string): Promise<PolicyDetail> {
  return apiFetch<PolicyDetail>(`/policies/${id}`, { method: "DELETE" });
}
export function restorePolicy(id: string): Promise<PolicyDetail> {
  return apiFetch<PolicyDetail>(`/policies/${id}/restore`, { method: "POST" });
}

// Generic policy-child CRUD. `kind` is the URL segment
// (installments|vehicles|drivers|beneficiaries|claims).
export function addPolicyChild<T>(
  policyId: string,
  kind: string,
  input: T,
): Promise<unknown> {
  return apiFetch(`/policies/${policyId}/${kind}`, {
    method: "POST",
    body: JSON.stringify(input),
  });
}
export function updatePolicyChild<T>(
  policyId: string,
  kind: string,
  childId: string,
  input: T,
): Promise<unknown> {
  return apiFetch(`/policies/${policyId}/${kind}/${childId}`, {
    method: "PATCH",
    body: JSON.stringify(input),
  });
}
export function removePolicyChild(
  policyId: string,
  kind: string,
  childId: string,
): Promise<unknown> {
  return apiFetch(`/policies/${policyId}/${kind}/${childId}`, {
    method: "DELETE",
  });
}

/* ------------------------------------------------- Lookups (insurance ref) */

export function getLookups(): Promise<LookupsResponse> {
  return apiFetch<LookupsResponse>("/lookups");
}
export function createLookup(kind: string, input: unknown): Promise<unknown> {
  return apiFetch(`/lookups/${kind}`, { method: "POST", body: JSON.stringify(input) });
}
export function updateLookup(
  kind: string,
  id: string,
  input: unknown,
): Promise<unknown> {
  return apiFetch(`/lookups/${kind}/${id}`, {
    method: "PATCH",
    body: JSON.stringify(input),
  });
}
export function removeLookup(kind: string, id: string): Promise<unknown> {
  return apiFetch(`/lookups/${kind}/${id}`, { method: "DELETE" });
}

/* ----------------------------------------------------- Utilities module */

export interface PropertyQuery {
  query?: string;
  page?: number;
  pageSize?: number;
  serviceKind?: ServiceKind;
  municipality?: string;
  bank?: string;
  trust?: TrustFilter;
  hasServices?: boolean;
  customerId?: string;
  days?: number;
  sort?: PropertySort;
}

export function listProperties(q: PropertyQuery): Promise<PropertyListResponse> {
  const params = new URLSearchParams();
  if (q.query) params.set("query", q.query);
  if (q.page) params.set("page", String(q.page));
  if (q.pageSize) params.set("pageSize", String(q.pageSize));
  if (q.serviceKind) params.set("serviceKind", q.serviceKind);
  if (q.municipality) params.set("municipality", q.municipality);
  if (q.bank) params.set("bank", q.bank);
  if (q.trust) params.set("trust", q.trust);
  if (q.hasServices !== undefined)
    params.set("hasServices", String(q.hasServices));
  if (q.customerId) params.set("customerId", q.customerId);
  if (q.days) params.set("days", String(q.days));
  if (q.sort) params.set("sort", q.sort);
  const qs = params.toString();
  return apiFetch<PropertyListResponse>(`/properties${qs ? `?${qs}` : ""}`);
}

export function getPropertyStats(
  days: number = EXPIRY_WINDOW_DAYS,
): Promise<PropertyStats> {
  return apiFetch<PropertyStats>(`/properties/stats?days=${days}`);
}

export function getPropertyFacets(): Promise<PropertyFacets> {
  return apiFetch<PropertyFacets>("/properties/facets");
}

export function getProperty(
  id: string,
  days: number = EXPIRY_WINDOW_DAYS,
): Promise<PropertyDetail> {
  return apiFetch<PropertyDetail>(`/properties/${id}?days=${days}`);
}

export function createProperty(input: PropertyInput): Promise<PropertyDetail> {
  return apiFetch<PropertyDetail>("/properties", {
    method: "POST",
    body: JSON.stringify(input),
  });
}
export function updateProperty(
  id: string,
  input: Partial<PropertyInput>,
): Promise<PropertyDetail> {
  return apiFetch<PropertyDetail>(`/properties/${id}`, {
    method: "PATCH",
    body: JSON.stringify(input),
  });
}
export function archiveProperty(id: string): Promise<PropertyDetail> {
  return apiFetch<PropertyDetail>(`/properties/${id}`, { method: "DELETE" });
}
export function restoreProperty(id: string): Promise<PropertyDetail> {
  return apiFetch<PropertyDetail>(`/properties/${id}/restore`, { method: "POST" });
}

// Service child CRUD.
export function addService(propertyId: string, input: ServiceInput): Promise<unknown> {
  return apiFetch(`/properties/${propertyId}/services`, {
    method: "POST",
    body: JSON.stringify(input),
  });
}
export function updateService(
  propertyId: string,
  serviceId: string,
  input: Partial<ServiceInput>,
): Promise<unknown> {
  return apiFetch(`/properties/${propertyId}/services/${serviceId}`, {
    method: "PATCH",
    body: JSON.stringify(input),
  });
}
export function removeService(propertyId: string, serviceId: string): Promise<unknown> {
  return apiFetch(`/properties/${propertyId}/services/${serviceId}`, {
    method: "DELETE",
  });
}

// Trust account (1:1 upsert).
export function upsertTrust(propertyId: string, input: TrustInput): Promise<unknown> {
  return apiFetch(`/properties/${propertyId}/trust`, {
    method: "PUT",
    body: JSON.stringify(input),
  });
}
export function removeTrust(propertyId: string): Promise<unknown> {
  return apiFetch(`/properties/${propertyId}/trust`, { method: "DELETE" });
}

export function removePropertyDocument(
  propertyId: string,
  documentId: string,
): Promise<unknown> {
  return apiFetch(`/properties/${propertyId}/documents/${documentId}`, {
    method: "DELETE",
  });
}

export function propertyDocumentDownloadUrl(
  propertyId: string,
  documentId: string,
): string {
  return `${API_ORIGIN}/properties/${propertyId}/documents/${documentId}/download`;
}

export function uploadPropertyDocument(
  propertyId: string,
  file: File,
  type?: string,
): Promise<unknown> {
  const q = type ? `?type=${encodeURIComponent(type)}` : "";
  return uploadFile(`/properties/${propertyId}/documents${q}`, file);
}

export function removePolicyDocument(
  policyId: string,
  documentId: string,
): Promise<unknown> {
  return apiFetch(`/policies/${policyId}/documents/${documentId}`, {
    method: "DELETE",
  });
}

export function policyDocumentDownloadUrl(
  policyId: string,
  documentId: string,
): string {
  return `${API_ORIGIN}/policies/${policyId}/documents/${documentId}/download`;
}

export function uploadPolicyDocument(
  policyId: string,
  file: File,
  type?: string,
): Promise<unknown> {
  const q = type ? `?type=${encodeURIComponent(type)}` : "";
  return uploadFile(`/policies/${policyId}/documents${q}`, file);
}

/* ------------------------------------------- Billing / statements module */

export interface MovementQuery {
  query?: string;
  page?: number;
  pageSize?: number;
  domain?: TransactionDomain;
  currency?: LedgerCurrency;
  direction?: LedgerDirection;
  typeId?: string;
  source?: string;
  customerId?: string;
  /** `YYYY-MM-DD`, inclusive on both ends. */
  from?: string;
  to?: string;
  sort?: MovementSort;
}

export function listMovements(q: MovementQuery): Promise<MovementListResponse> {
  const params = new URLSearchParams();
  if (q.query) params.set("query", q.query);
  if (q.page) params.set("page", String(q.page));
  if (q.pageSize) params.set("pageSize", String(q.pageSize));
  if (q.domain) params.set("domain", q.domain);
  if (q.currency) params.set("currency", q.currency);
  if (q.direction) params.set("direction", q.direction);
  if (q.typeId) params.set("typeId", q.typeId);
  if (q.source) params.set("source", q.source);
  if (q.customerId) params.set("customerId", q.customerId);
  if (q.from) params.set("from", q.from);
  if (q.to) params.set("to", q.to);
  if (q.sort) params.set("sort", q.sort);
  const qs = params.toString();
  return apiFetch<MovementListResponse>(`/billing${qs ? `?${qs}` : ""}`);
}

export interface BalanceQuery {
  query?: string;
  page?: number;
  pageSize?: number;
  currency?: LedgerCurrency;
  balance?: BalanceFilter;
  domain?: TransactionDomain;
  sort?: BalanceSort;
}

export function listBalances(q: BalanceQuery): Promise<BalanceListResponse> {
  const params = new URLSearchParams();
  if (q.query) params.set("query", q.query);
  if (q.page) params.set("page", String(q.page));
  if (q.pageSize) params.set("pageSize", String(q.pageSize));
  if (q.currency) params.set("currency", q.currency);
  if (q.balance) params.set("balance", q.balance);
  if (q.domain) params.set("domain", q.domain);
  if (q.sort) params.set("sort", q.sort);
  const qs = params.toString();
  return apiFetch<BalanceListResponse>(`/billing/balances${qs ? `?${qs}` : ""}`);
}

export function getBillingStats(): Promise<BillingStats> {
  return apiFetch<BillingStats>("/billing/stats");
}

export function getBillingFacets(): Promise<BillingFacets> {
  return apiFetch<BillingFacets>("/billing/facets");
}

export function getStatement(customerId: string): Promise<Statement> {
  return apiFetch<Statement>(`/billing/customers/${customerId}`);
}

/** Append a new ledger movement. Booked movements are never edited — fix
 *  mistakes with voidMovement + a fresh capture. */
export function createMovement(
  input: CreateMovementInput,
): Promise<Transaction> {
  return apiFetch<Transaction>("/billing", {
    method: "POST",
    body: JSON.stringify(input),
  });
}

/** Reverse a movement by marking it voided; totals drop it. 400 if already void. */
export function voidMovement(id: string): Promise<Transaction> {
  return apiFetch<Transaction>(`/billing/${id}/void`, { method: "POST" });
}

/* ------------------------------------------------- Bank register (chequera) */

export interface BankQuery {
  query?: string;
  page?: number;
  pageSize?: number;
  direction?: BankDirection;
  cleared?: BankCleared;
  /** `YYYY-MM-DD`, inclusive on both ends. */
  from?: string;
  to?: string;
  sort?: BankSort;
}

export function listBankMovements(q: BankQuery): Promise<BankListResponse> {
  const params = new URLSearchParams();
  if (q.query) params.set("query", q.query);
  if (q.page) params.set("page", String(q.page));
  if (q.pageSize) params.set("pageSize", String(q.pageSize));
  if (q.direction) params.set("direction", q.direction);
  if (q.cleared) params.set("cleared", q.cleared);
  if (q.from) params.set("from", q.from);
  if (q.to) params.set("to", q.to);
  if (q.sort) params.set("sort", q.sort);
  const qs = params.toString();
  return apiFetch<BankListResponse>(`/bank${qs ? `?${qs}` : ""}`);
}

export function getBankStats(): Promise<BankStats> {
  return apiFetch<BankStats>("/bank/stats");
}

export function getBankFacets(): Promise<BankFacets> {
  return apiFetch<BankFacets>("/bank/facets");
}

export function getBankSummary(year?: number): Promise<BankSummary> {
  return apiFetch<BankSummary>(`/bank/summary${year ? `?year=${year}` : ""}`);
}

/** Append a new chequera movement. Booked rows are never edited — fix mistakes
 *  with voidBankMovement + a fresh capture. */
export function createBankMovement(
  input: CreateBankMovementInput,
): Promise<unknown> {
  return apiFetch("/bank", {
    method: "POST",
    body: JSON.stringify(input),
  });
}

/** Reverse a chequera movement by marking it voided; totals drop it. */
export function voidBankMovement(id: string): Promise<unknown> {
  return apiFetch(`/bank/${id}/void`, { method: "POST" });
}

/* ------------------------------------------------- Users / administration */

export function listUsers(): Promise<UserRow[]> {
  return apiFetch<UserRow[]>("/users");
}

export interface CreateUserInput {
  name: string;
  email: string;
  password: string;
  role: Role;
  active?: boolean;
}

export function createUser(input: CreateUserInput): Promise<UserRow> {
  return apiFetch<UserRow>("/users", {
    method: "POST",
    body: JSON.stringify(input),
  });
}

export interface UpdateUserInput {
  name?: string;
  email?: string;
  role?: Role;
  active?: boolean;
}

export function updateUser(id: string, input: UpdateUserInput): Promise<UserRow> {
  return apiFetch<UserRow>(`/users/${id}`, {
    method: "PATCH",
    body: JSON.stringify(input),
  });
}

export function resetUserPassword(id: string, password: string): Promise<UserRow> {
  return apiFetch<UserRow>(`/users/${id}/reset-password`, {
    method: "POST",
    body: JSON.stringify({ password }),
  });
}

export function deleteUser(id: string): Promise<void> {
  return apiFetch<void>(`/users/${id}`, { method: "DELETE" });
}

/* ------------------------------------------- DB operations (admin only) */

export function listIngest(): Promise<IngestFile[]> {
  return apiFetch<IngestFile[]>("/ops/ingest");
}

/**
 * Multipart upload — not JSON, so it bypasses apiFetch's Content-Type. `path`
 * is API-relative (may include a query string); `filename` overrides the part
 * name sent to the server.
 */
export async function uploadFile(
  path: string,
  file: File,
  filename?: string,
): Promise<unknown> {
  const body = new FormData();
  body.append("file", file, filename ?? file.name);
  const res = await fetch(`${API_ORIGIN}${path}`, {
    method: "POST",
    credentials: "include",
    body,
  });
  if (!res.ok) {
    let message = `Error ${res.status}`;
    try {
      const b = await res.json();
      if (b?.message) message = b.message;
    } catch {
      /* ignore */
    }
    throw new ApiError(res.status, message);
  }
  return res.status === 204 ? undefined : res.json().catch(() => undefined);
}

export function uploadIngest(name: string, file: File): Promise<unknown> {
  return uploadFile(`/ops/ingest/${encodeURIComponent(name)}`, file, name);
}

export function deleteIngest(name: string): Promise<unknown> {
  return apiFetch(`/ops/ingest/${encodeURIComponent(name)}`, { method: "DELETE" });
}

export function listBackups(): Promise<BackupFile[]> {
  return apiFetch<BackupFile[]>("/ops/backups");
}

export function backupDownloadUrl(name: string): string {
  return `${API_ORIGIN}/ops/backups/${encodeURIComponent(name)}/download`;
}

export function deleteBackup(name: string): Promise<unknown> {
  return apiFetch(`/ops/backups/${encodeURIComponent(name)}`, { method: "DELETE" });
}

export function listOpsJobs(): Promise<OpsJob[]> {
  return apiFetch<OpsJob[]>("/ops/jobs");
}

export function getOpsJob(id: string): Promise<OpsJob> {
  return apiFetch<OpsJob>(`/ops/jobs/${id}`);
}

/** Start a mutating op. `file` is required for RESTORE. 409 if one is running. */
export function startOpsJob(kind: OpsJobKind, file?: string): Promise<OpsJob> {
  return apiFetch<OpsJob>("/ops/jobs", {
    method: "POST",
    body: JSON.stringify({ kind, file }),
  });
}