/**
 * Zod schemas + types for the web app's HTTP API (browser ↔ Next.js route
 * handlers). One source of truth so the client and server can't drift.
 */
import { z } from "zod";

export const MAX_TEXT_LENGTH = 1000;
export const SESSION_TTL_SECONDS = 30 * 60;

/* ── Auth ─────────────────────────────────────────────────────────────── */

export const userSchema = z.object({
  id: z.number().int(),
  username: z.string(),
  hfId: z.string(),
  avatarUrl: z.string().nullable(),
  showInLeaderboard: z.boolean(),
  isAdmin: z.boolean(),
});
export type ApiUser = z.infer<typeof userSchema>;

export const meResponseSchema = z.object({
  user: userSchema.nullable(),
});
export type MeResponse = z.infer<typeof meResponseSchema>;

/* ── TTS generate ─────────────────────────────────────────────────────── */

export const ttsGenerateRequestSchema = z.object({
  text: z.string().trim().min(1).max(MAX_TEXT_LENGTH),
  /** True when the text came from the prompt pool (the Random button), not
   *  free-typed. Determines the vote's recorded sentenceOrigin. */
  fromPool: z.boolean().optional(),
  /** Signed proof that this exact prompt was served by the random endpoint. */
  promptToken: z.string().optional(),
});
export type TTSGenerateRequest = z.infer<typeof ttsGenerateRequestSchema>;

export const conversationalLineSchema = z.object({
  text: z.string().trim().min(1).max(MAX_TEXT_LENGTH),
  speaker: z.union([z.literal(0), z.literal(1)]),
});
export type ConversationalLine = z.infer<typeof conversationalLineSchema>;

export const conversationalGenerateRequestSchema = z.object({
  script: z.array(conversationalLineSchema).min(2),
});
export type ConversationalGenerateRequest = z.infer<
  typeof conversationalGenerateRequestSchema
>;

export const generateResponseSchema = z.object({
  sessionId: z.string().uuid(),
  audioA: z.string(),
  audioB: z.string(),
  expiresIn: z.number().int(),
});
export type GenerateResponse = z.infer<typeof generateResponseSchema>;

/* ── Vote ─────────────────────────────────────────────────────────────── */

export const voteRequestSchema = z.object({
  sessionId: z.string().uuid(),
  chosen: z.union([z.literal("a"), z.literal("b")]),
});
export type VoteRequest = z.infer<typeof voteRequestSchema>;

export const revealedModelSchema = z.object({
  id: z.string(),
  name: z.string(),
  open: z.boolean(),
  url: z.string(),
});

export const voteResponseSchema = z.object({
  chosen: revealedModelSchema,
  rejected: revealedModelSchema,
  /** Whether this vote affected the public Elo board. */
  counted: z.boolean(),
});
export type VoteResponse = z.infer<typeof voteResponseSchema>;

/**
 * When a captcha is required before the vote can be recorded, the vote endpoint
 * returns this instead (HTTP 200) — the client solves the Cap challenge and
 * retries with the token. Kept separate so the normal path stays unchanged.
 */
export const captchaRequiredSchema = z.object({
  needsCaptcha: z.literal(true),
});
export type CaptchaRequired = z.infer<typeof captchaRequiredSchema>;

/* ── Leaderboard ──────────────────────────────────────────────────────── */

export const leaderboardRowSchema = z.object({
  rank: z.number().int(),
  id: z.string(),
  name: z.string(),
  url: z.string(),
  /** Optional provider logo URL. */
  icon: z.string().nullable(),
  /** Displayed rating: Glicko-2 while preliminary, Bradley–Terry once established. */
  elo: z.number().int(),
  /** ± uncertainty on the rating (≈2·RD for Glicko, half the BT CI width). */
  uncertainty: z.number().int(),
  winRate: z.number(), // 0–100
  totalVotes: z.number().int(),
  tier: z.enum(["S", "A", "B"]).nullable(),
  open: z.boolean(),
  /** True while the model has < ESTABLISHED_THRESHOLD counted votes. */
  preliminary: z.boolean(),
  /**
   * False for retired models kept on the board for their historical rating
   * (no longer battled). The UI badges these "no longer active".
   */
  active: z.boolean(),
  /**
   * True when the model was pulled for misconduct (e.g. vote manipulation). It's
   * delisted from the ranking (rank 0) and shown with a "Suspended" badge; its
   * row and votes are preserved as evidence.
   */
  suspended: z.boolean(),
  /** Unix seconds when suspended (for the badge tooltip). */
  suspendedAt: z.number().int().nullable(),
  /** Human-readable suspension reason (badge tooltip). */
  suspendedReason: z.string().nullable(),
});
export type LeaderboardRow = z.infer<typeof leaderboardRowSchema>;

export const leaderboardResponseSchema = z.object({
  rows: z.array(leaderboardRowSchema),
});
export type LeaderboardResponse = z.infer<typeof leaderboardResponseSchema>;

export const topVoterSchema = z.object({
  rank: z.number().int(),
  username: z.string(),
  voteCount: z.number().int(),
});
export type TopVoter = z.infer<typeof topVoterSchema>;

/* ── Sentences ────────────────────────────────────────────────────────── */

export const randomSentenceResponseSchema = z.object({
  sentence: z.string(),
  promptToken: z.string(),
});
export type RandomSentenceResponse = z.infer<
  typeof randomSentenceResponseSchema
>;

export const sentenceStatsSchema = z.object({
  total: z.number().int(),
  consumed: z.number().int(),
  remaining: z.number().int(),
  consumptionPct: z.number(),
});
export type SentenceStats = z.infer<typeof sentenceStatsSchema>;

/* ── Errors ───────────────────────────────────────────────────────────── */

export const errorResponseSchema = z.object({
  error: z.string(),
  detail: z.string().optional(),
});
export type ErrorResponse = z.infer<typeof errorResponseSchema>;