/**
 * Shared OpenAPI building blocks — response envelopes and standard error responses used across every route module.
 *
 * Part of the OpenAPI route table; aggregated in `./index.ts`.
 * Schemas come from `src/lib/validations/*` where shared with the
 * runtime request parsing, so the wire contract stays single-source.
 */
import { z } from "zod/v4";
import {
  createMeasurementSchema,
  listMeasurementsSchema,
  measurementTypeEnum,
  measurementSourceEnum,
} from "@/lib/validations/measurement";
import { loginPasswordSchema } from "@/lib/validations/auth";
import { coachPrefsSchema } from "@/lib/validations/coach-prefs";
import { createBatchWorkoutSchema } from "@/lib/validations/workout";

/**
 * Common envelopes — every HealthLog API response wraps payload in
 * `{ data, error, meta? }`. The OpenAPI surface mirrors that contract
 * so iOS / external-ingest clients can decode uniformly.
 */
export const errorEnvelope = z
  .object({
    data: z.null(),
    error: z.string(),
    meta: z
      .object({
        requestId: z.string().optional(),
        errorCode: z.string().optional(),
      })
      .optional(),
  })
  .meta({
    id: "ErrorEnvelope",
    description: "Standard error response: data is null, error is human prose.",
  });

export function dataEnvelope<T extends z.ZodType>(payload: T, id: string) {
  return z
    .object({
      data: payload,
      error: z.null(),
      meta: z.object({ requestId: z.string().optional() }).optional(),
    })
    .meta({ id });
}

// ── Schemas — annotated for spec emission ────────────────────────────

measurementTypeEnum.meta({
  id: "MeasurementType",
  description:
    "DB-stored measurement category. v1.4.23 added 7 Apple Health values (HRV, resting HR, active energy, flights, walking/running distance, VO2 max, body temperature).",
});

measurementSourceEnum.meta({
  id: "MeasurementSource",
  description:
    "Origin of the measurement. v1.4.23 added APPLE_HEALTH for the iOS HealthKit batch ingest path.",
});

loginPasswordSchema.meta({
  id: "LoginPasswordRequest",
  description:
    "Email-or-username login. The native-client flow returns a paired access + refresh token when X-Client-Type: native or the iOS UA prefix is present.",
});

createMeasurementSchema.meta({
  id: "CreateMeasurementRequest",
  description:
    "Single-measurement ingest body. Plausibility-range guard runs server-side; out-of-range values fail 422.",
});

listMeasurementsSchema.meta({
  id: "ListMeasurementsQuery",
  description:
    "Query params for the measurements list endpoint. `limit` capped at 500.",
});

coachPrefsSchema.meta({
  id: "CoachPrefs",
  description:
    "Per-user Coach prompt-tuning preferences (v1.4.23 H4). All fields default to the legacy v1.4.22 behaviour when omitted.",
});

createBatchWorkoutSchema.meta({
  id: "CreateBatchWorkoutRequest",
  description:
    "Typed workout batch ingest. Each entry is an HKWorkout-aligned record with an optional nested GeoJSON LineString route AND an optional route-independent per-workout heart-rate series (`samples`: `[{ t, hr?, speedMs?, power?, cadence? }]`, up to 30 000 points). The `samples` series is the strain-engine input for indoor workouts that have no GPS route. Up to 100 workouts per call; nested route geometry capped at 20 000 points. Withings server-to-server callers pass source: WITHINGS and ship no route (Withings reports aggregates only).",
});

// ── Standard 401 / 422 / 429 responses ───────────────────────────────

export const stdResponses = {
  "401": {
    description: "Authentication required or invalid credentials.",
    content: { "application/json": { schema: errorEnvelope } },
  },
  "422": {
    description: "Request validation failed.",
    content: { "application/json": { schema: errorEnvelope } },
  },
  "429": {
    description: "Rate limit exceeded.",
    content: { "application/json": { schema: errorEnvelope } },
  },
};

// ── AI-consent precondition (v1.16.13) ───────────────────────────────
// The server-managed AI-egress gate requires an active ConsentReceipt
// (`ai_full`, or the surface-specific `ai_insights_only` / `ai_coach`)
// before any health snapshot leaves for the operator's global LLM key.
// Interactive routes surface this as a 403 with
// `meta.errorCode = "consent.ai.required"`; clients render an inline
// grant-consent notice and call POST /api/consent/ai (or, on web, POST
// /api/consent/ai/web) to mint the receipt. BYOK / local / ChatGPT-OAuth
// chains are the user's own egress and never trip this gate.
export const consentRequiredResponse = {
  "403": {
    description:
      "AI consent required: no active ConsentReceipt for the server-managed provider. `meta.errorCode` = `consent.ai.required`. Mint a receipt via POST /api/consent/ai before retrying.",
    content: { "application/json": { schema: errorEnvelope } },
  },
};

// ── Module-disabled gate (v1.18.0) ───────────────────────────────────
// Every module-scoped route runs `requireModuleEnabled(userId, key)`,
// which returns a 403 when the account has the module turned off — even
// with a valid Bearer token. The envelope carries
// `meta.errorCode = "module.disabled"` and `meta.module` (the disabled
// module key) so the iOS retry classifier branches on it and the client
// can drop the whole surface. The errorEnvelope shape already declares
// `meta.errorCode`; `meta.module` is documented here in prose.
export const moduleDisabledResponse = {
  "403": {
    description:
      'Module disabled for this account: the user (or operator) has the module turned off. `meta.errorCode` = `module.disabled` and `meta.module` carries the disabled module key (e.g. "sleep"). Returned even for a valid Bearer token. Clients hide the whole module surface end-to-end rather than retry.',
    content: { "application/json": { schema: errorEnvelope } },
  },
};