/**
 * Customer Domain - Schemas
 *
 * Zod validation schemas for customer domain types.
 * Pattern matches billing and subscriptions domains.
 *
 * Architecture:
 * - UserAuth: Auth state from portal database (Prisma)
 * - WhmcsClient: Full WHMCS data (raw field names, internal to providers)
 * - User: API response type (normalized camelCase)
 */

import { z } from "zod";

import { countryCodeSchema } from "../common/schema.js";
import {
  whmcsRequiredNumber,
  whmcsOptionalNumber,
  whmcsOptionalBoolean,
} from "../common/providers/whmcs-utils/index.js";
import {
  whmcsClientSchema as whmcsRawClientSchema,
  whmcsCustomFieldSchema,
} from "./providers/whmcs/raw.types.js";

// ============================================================================
// Helper Schemas
// ============================================================================

const stringOrNull = z.union([z.string(), z.null()]);

// ============================================================================
// Address Schemas
// ============================================================================

/**
 * Address schema - matches pattern from other domains (not "CustomerAddress")
 */
export const addressSchema = z.object({
  address1: stringOrNull.optional(),
  address2: stringOrNull.optional(),
  city: stringOrNull.optional(),
  state: stringOrNull.optional(),
  postcode: stringOrNull.optional(),
  country: stringOrNull.optional(),
  countryCode: stringOrNull.optional(),
  phoneNumber: stringOrNull.optional(),
  phoneCountryCode: stringOrNull.optional(),
});

export const addressFormSchema = z.object({
  address1: z
    .string()
    .min(1, "Address line 1 is required")
    .max(200, "Address line 1 is too long")
    .trim(),
  address2: z.string().max(200, "Address line 2 is too long").trim().optional(),
  city: z.string().min(1, "City is required").max(100, "City name is too long").trim(),
  state: z
    .string()
    .min(1, "State/Prefecture is required")
    .max(100, "State/Prefecture name is too long")
    .trim(),
  postcode: z.string().min(1, "Postcode is required").max(20, "Postcode is too long").trim(),
  country: z.string().min(1, "Country is required").max(100, "Country name is too long").trim(),
  countryCode: countryCodeSchema.optional(),
  phoneNumber: z.string().optional(),
  phoneCountryCode: z.string().optional(),
});

// ============================================================================
// Profile Edit Schemas
// ============================================================================

/**
 * Profile edit form schema for frontend forms
 * Contains basic editable user profile fields (WHMCS field names)
 */
export const profileEditFormSchema = z.object({
  email: z.string().email("Enter a valid email").trim(),
  phonenumber: z.string().optional(),
});

// ============================================================================
// UserAuth Schema (Portal Database - Auth State Only)
// ============================================================================

/**
 * UserAuth - Authentication state from portal database
 *
 * Source: Portal database (Prisma)
 * Provider: customer/providers/portal/
 *
 * Contains ONLY auth-related fields:
 * - User ID, email, role
 * - Email verification status
 * - MFA enabled status
 * - Last login timestamp
 */
export const userAuthSchema = z.object({
  id: z.string().uuid(),
  email: z.string().email(),
  role: z.enum(["USER", "ADMIN"]),
  emailVerified: z.boolean(),
  mfaEnabled: z.boolean(),
  lastLoginAt: z.string().optional(),
  createdAt: z.string(),
  updatedAt: z.string(),
});

// ============================================================================
// WHMCS-Specific Schemas (Internal to Providers)
// ============================================================================

/**
 * Email preferences from WHMCS
 * Internal to Providers.Whmcs namespace
 */
const emailPreferencesSchema = z.object({
  general: whmcsOptionalBoolean,
  invoice: whmcsOptionalBoolean,
  support: whmcsOptionalBoolean,
  product: whmcsOptionalBoolean,
  domain: whmcsOptionalBoolean,
  affiliate: whmcsOptionalBoolean,
});

/**
 * Sub-user from WHMCS
 * Internal to Providers.Whmcs namespace
 */
const subUserSchema = z.object({
  id: whmcsRequiredNumber,
  name: z.string(),
  email: z.string(),
  is_owner: whmcsOptionalBoolean,
});

/**
 * Billing stats from WHMCS
 * Internal to Providers.Whmcs namespace
 */
const statsSchema = z.record(z.string(), z.union([z.string(), z.number(), z.boolean()])).optional();

const normalizeCustomFields = (input: unknown): unknown => {
  if (!input) return input;
  if (Array.isArray(input)) return input;
  if (typeof input === "object" && input !== null && "customfield" in input) {
    const cf = (input as Record<string, unknown>)["customfield"];
    if (Array.isArray(cf)) return cf;
    return cf ? [cf] : input;
  }
  return input;
};

const whmcsCustomFieldsSchema = z
  .preprocess(normalizeCustomFields, z.array(whmcsCustomFieldSchema).optional())
  .optional();

const normalizeUsers = (input: unknown): unknown => {
  if (!input) return input;
  if (Array.isArray(input)) return input;
  if (typeof input === "object" && input !== null && "user" in input) {
    const u = (input as Record<string, unknown>)["user"];
    if (Array.isArray(u)) return u;
    return u ? [u] : input;
  }
  return input;
};

const whmcsUsersSchema = z.preprocess(normalizeUsers, z.array(subUserSchema).optional()).optional();

/**
 * WhmcsClient - Full WHMCS client data
 *
 * Raw WHMCS structure with field names as they come from the API.
 * Internal to Providers.Whmcs namespace - not exported at top level.
 *
 * Includes:
 * - Profile data (firstname, lastname, companyname, etc.)
 * - Billing info (currency_code, defaultgateway, status)
 * - Preferences (email_preferences, allowSingleSignOn)
 * - Relations (users, stats, customfields)
 */
const nullableProfileFields = [
  "firstname",
  "lastname",
  "fullname",
  "companyname",
  "phonenumber",
  "phonenumberformatted",
  "telephoneNumber",
  "status",
  "language",
  "defaultgateway",
  "currency_code",
  "tax_id",
  "notes",
  "datecreated",
  "lastlogin",
] as const;

const nullableProfileOverrides = nullableProfileFields.reduce<Record<string, z.ZodTypeAny>>(
  (acc, field) => {
    acc[field] = z.string().nullable().optional();
    return acc;
  },
  {}
);

export const whmcsClientSchema = whmcsRawClientSchema.extend({
  ...nullableProfileOverrides,
  defaultpaymethodid: whmcsOptionalNumber.nullable(),
  currency: whmcsOptionalNumber.nullable(),
  allowSingleSignOn: whmcsOptionalBoolean.nullable(),
  email_verified: whmcsOptionalBoolean.nullable(),
  marketing_emails_opt_in: whmcsOptionalBoolean.nullable(),
  address: addressSchema.nullable().optional(),
  email_preferences: emailPreferencesSchema.nullable().optional(),
  customfields: whmcsCustomFieldsSchema,
  users: whmcsUsersSchema,
  stats: statsSchema.optional(),
});

// ============================================================================
// User Schema (API Response - Normalized camelCase)
// ============================================================================

/**
 * User - Complete user profile for API responses
 *
 * Composition: UserAuth (portal DB) + WhmcsClient (WHMCS)
 * Field names match WHMCS API exactly (no transformation)
 *
 * Use combineToUser() helper to construct from sources
 */
export const userSchema = userAuthSchema.extend({
  // Profile fields (WHMCS field names - direct from API)
  firstname: z.string().nullable().optional(),
  lastname: z.string().nullable().optional(),
  fullname: z.string().nullable().optional(),
  companyname: z.string().nullable().optional(),
  phonenumber: z.string().nullable().optional(),
  language: z.string().nullable().optional(),
  currency_code: z.string().nullable().optional(), // WHMCS uses snake_case for this
  address: addressSchema.optional(),

  // Common portal-visible identifiers/custom fields (derived in BFF)
  sfNumber: z.string().nullable().optional(),
  dateOfBirth: z.string().nullable().optional(),
  gender: z.string().nullable().optional(),
});

// ============================================================================
// Helper Functions
// ============================================================================

/**
 * Convert address form data to address request format
 * Trims strings and converts empty strings to null
 */
export function addressFormToRequest(form: AddressFormData): Address {
  const emptyToNull = (value?: string | null) => {
    if (value === undefined) return;
    const trimmed = value?.trim();
    return trimmed ? trimmed : null;
  };

  return addressSchema.parse({
    address1: emptyToNull(form.address1),
    address2: emptyToNull(form.address2 ?? null),
    city: emptyToNull(form.city),
    state: emptyToNull(form.state),
    postcode: emptyToNull(form.postcode),
    country: emptyToNull(form.country),
    countryCode: emptyToNull(form.countryCode ?? null),
    phoneNumber: emptyToNull(form.phoneNumber ?? null),
    phoneCountryCode: emptyToNull(form.phoneCountryCode ?? null),
  });
}

/**
 * Convert profile form data to update request format
 * No transformation needed - form already uses WHMCS field names
 */
export function profileFormToRequest(form: ProfileEditFormData): {
  email: string;
  phonenumber?: string | undefined;
} {
  return {
    email: form.email.trim(),
    phonenumber: form.phonenumber?.trim() || undefined,
  };
}

/**
 * Combine UserAuth and WhmcsClient into User
 *
 * This is the single source of truth for constructing User from its sources.
 * No field name transformation - User schema uses WHMCS field names directly.
 *
 * @param userAuth - Authentication state from portal database
 * @param whmcsClient - Full client data from WHMCS
 * @returns User object for API responses with WHMCS field names
 */
export function combineToUser(userAuth: UserAuth, whmcsClient: WhmcsClient): User {
  return userSchema.parse({
    // Auth state from portal DB
    id: userAuth.id,
    email: userAuth.email,
    role: userAuth.role,
    emailVerified: userAuth.emailVerified,
    mfaEnabled: userAuth.mfaEnabled,
    lastLoginAt: userAuth.lastLoginAt,
    createdAt: userAuth.createdAt,
    updatedAt: userAuth.updatedAt,

    // Profile from WHMCS (no transformation - keep field names as-is)
    firstname: whmcsClient.firstname || null,
    lastname: whmcsClient.lastname || null,
    fullname: whmcsClient.fullname || null,
    companyname: whmcsClient.companyname || null,
    phonenumber:
      whmcsClient.phonenumberformatted ||
      whmcsClient.phonenumber ||
      whmcsClient.telephoneNumber ||
      null,
    language: whmcsClient.language || null,
    currency_code: whmcsClient.currency_code || null,
    address: whmcsClient.address || undefined,
  });
}

// ============================================================================
// Verification (Customer-facing)
// ============================================================================

/**
 * Residence card verification status shown in the portal.
 *
 * Stored in Salesforce on the Account record.
 */
export const residenceCardVerificationStatusSchema = z.enum([
  "not_submitted",
  "pending",
  "verified",
  "rejected",
]);

export const residenceCardVerificationSchema = z.object({
  status: residenceCardVerificationStatusSchema,
  submittedAt: z.string().datetime().nullable(),
  reviewedAt: z.string().datetime().nullable(),
  reviewerNotes: z.string().nullable(),
});

// ============================================================================
// Exported Types (Public API)
// ============================================================================

export type User = z.infer<typeof userSchema>;
export type UserAuth = z.infer<typeof userAuthSchema>;
export type UserRole = "USER" | "ADMIN";
export type Address = z.infer<typeof addressSchema>;
export type AddressFormData = z.infer<typeof addressFormSchema>;
export type ProfileEditFormData = z.infer<typeof profileEditFormSchema>;
export type ResidenceCardVerificationStatus = z.infer<typeof residenceCardVerificationStatusSchema>;
export type ResidenceCardVerification = z.infer<typeof residenceCardVerificationSchema>;

// Convenience aliases
export type UserProfile = User; // Alias for user profile
export type AuthenticatedUser = User; // Alias for authenticated user context

// ============================================================================
// Internal Types (For Providers)
// ============================================================================

export type WhmcsClient = z.infer<typeof whmcsClientSchema>;
export type EmailPreferences = z.infer<typeof emailPreferencesSchema>;
export type SubUser = z.infer<typeof subUserSchema>;
export type Stats = z.infer<typeof statsSchema>;

// Export schemas for provider use
export { emailPreferencesSchema, subUserSchema, statsSchema };