import type { z } from "zod";

import { AnalysisInputError } from "../analysisErrorCore.js";
import { projectInputIssues } from "../inputIssueProjection.js";
import type { Evidence } from "../evidence.js";
import { safeParseEvidence } from "../evidenceValidation.js";

const OPERATION = "reconcile_javascript_runtime";

/** Parse one caller-owned source value and prefix failures with its request path. */
export const parseInputAtPath = <Schema extends z.ZodType>(
  schema: Schema,
  input: unknown,
  path: readonly (string | number)[],
): z.output<Schema> => {
  const parsed = schema.safeParse(input);
  if (!parsed.success)
    throw inputErrorAtPath(parsed.error.issues, input, path, parsed.error);
  return parsed.data;
};

/** Authenticate Evidence while preserving the reconciliation input contract. */
export const authenticateRuntimeEvidence = (
  input: unknown,
  path: readonly (string | number)[],
): Evidence => {
  const parsed = safeParseEvidence(input);
  if (parsed.ok) return parsed.value;
  throw inputErrorAtPath(parsed.error.issues, input, path, parsed.error);
};

/** Represent one cross-field caller constraint as a standard input issue. */
export const invalidInput = (
  path: readonly (string | number)[],
  message: string,
): AnalysisInputError =>
  new AnalysisInputError(OPERATION, undefined, [
    { path: [...path], reason: "invalid_value", message },
  ]);

/** Verify authenticated Evidence against one supported producer contract. */
export const assertEvidenceIdentity = (
  evidence: Evidence,
  expected: {
    readonly operation: string;
    readonly predicate: string;
    readonly providerId: string;
    readonly providerName: string;
    readonly providerVersion: string;
    readonly authority: Evidence["authority"];
    readonly confidence: Evidence["confidence"];
  },
  path: readonly (string | number)[],
): void => {
  if (
    evidence.operation !== expected.operation ||
    evidence.predicate_type !== expected.predicate ||
    evidence.provider.id !== expected.providerId ||
    evidence.provider.name !== expected.providerName ||
    evidence.provider.version !== expected.providerVersion ||
    evidence.authority !== expected.authority ||
    evidence.confidence !== expected.confidence
  )
    throw invalidInput(
      path,
      `Evidence does not match the supported ${expected.operation} contract`,
    );
};

const inputErrorAtPath = (
  issues: readonly z.core.$ZodIssue[],
  input: unknown,
  path: readonly (string | number)[],
  cause: unknown,
): AnalysisInputError =>
  new AnalysisInputError(
    OPERATION,
    { cause },
    projectInputIssues(issues, input).map((issue) => ({
      ...issue,
      path: [...path, ...issue.path],
    })),
  );