import { z } from 'zod';

/**
 * Runtime mirrors of the TypeScript interfaces in `src/types/index.ts`.
 *
 * A TS interface is a compile-time-only promise: nothing stops the Django
 * side from renaming a field, changing its nullability, or dropping a facet,
 * and the frontend would only find out at runtime, in production, as a blank
 * screen or a silently-wrong render. These schemas are validated against the
 * real API response in `search-response.contract.test.ts`, so that class of
 * drift fails a test instead.
 */

export const FacetBucketSchema = z.object({
  key: z.string(),
  count: z.number().int().nonnegative(),
});

export const FACET_NAMES = [
  'skills',
  'job_title_role',
  'seniority',
  'country',
  'industry',
  'company',
] as const;

export const SearchHitSchema = z.object({
  id: z.number(),
  score: z.number(),
  full_name: z.string(),
  headline: z.string(),
  job_title: z.string(),
  job_title_role: z.string(),
  seniority_levels: z.array(z.string()),
  company: z.string(),
  industry: z.string(),
  location_name: z.string(),
  location_country: z.string(),
  years_experience: z.number().nullable(),
  linkedin_url: z.string(),
  skills: z.array(z.string()),
  highlight: z.record(z.string(), z.array(z.string())),
});

export const SearchResponseSchema = z.object({
  count: z.number().int().nonnegative(),
  page: z.number().int().positive(),
  page_size: z.number().int().positive(),
  total_pages: z.number().int().nonnegative(),
  took_ms: z.number().int().nonnegative(),
  backend: z.string(),
  results: z.array(SearchHitSchema),
  facets: z.record(z.enum(FACET_NAMES), z.array(FacetBucketSchema)),
});

export const UserSchema = z.object({
  id: z.number(),
  email: z.string(),
  full_name: z.string(),
  role: z.enum(['admin', 'analyst', 'viewer']),
  can_view_pii: z.boolean(),
  date_joined: z.string(),
});

export const TokenPairSchema = z.object({
  access: z.string(),
  refresh: z.string(),
  user: UserSchema,
});

export const ApiErrorSchema = z.object({
  error: z.object({
    code: z.string(),
    message: z.string(),
    details: z.unknown().optional(),
    request_id: z.string(),
  }),
});