// Native JSON decoding and resource admission; row-wise validation bounds errors.
import { z } from "zod";
import { FactFailure } from "./fact-error.mjs";
import { NATIVE_OUTPUT_BYTES } from "./limits.mjs";
import { readCallFacet } from "./native-call-contract.mjs";
import {
  hex,
  ordinal,
  valueId,
  operationId,
  value,
  rowParser,
  requireFact,
  formatFailure,
  readNativeFacet,
} from "./native-contract.mjs";
const edgeId = z.string().regex(/^\d+:\d+$/u);
const edge = z.strictObject({
  id: edgeId,
  target: ordinal,
  index: ordinal,
  polarity: z.enum(["true", "false"]).nullable(),
  condition_value: valueId.nullable(),
  condition_test: z.enum(["eq-zero", "ne-zero"]).nullable(),
});
const operation = z.strictObject({
  id: operationId,
  address: hex,
  block: ordinal,
  opcode: z.string(),
  statement: z.string(),
  is_dead: z.boolean(),
  inputs: z.array(
    z.strictObject({
      input_index: ordinal,
      value_id: valueId.nullable(),
      phi_predecessor: ordinal.nullable(),
      phi_predecessor_edge: edgeId.nullable(),
    }),
  ),
  output: valueId.nullable(),
});
const factsSchema = z.strictObject({
  schema_version: z.literal(3),
  blocks: z
    .array(
      z.strictObject({
        id: ordinal,
        start: hex,
        operations: z.array(operationId),
        predecessors: z.array(ordinal),
        successors: z.array(edge),
      }),
    )
    .min(1)
    .max(12000),
  operations: z.array(operation).max(12000),
  values: z.array(value).max(36000),
  coverage: z.strictObject({
    scope: z.string(),
    machine_semantic_equivalence: z.literal("unknown"),
    indirect_branch_operations: z.array(operationId),
    omitted_definition_ids: z.array(operationId),
    issues: z.array(z.string()),
  }),
});
const documentSchema = z.object({
  binary: z.string(),
  count: z.literal(1),
  language: z.string(),
  error: z.null(),
  functions: z
    .array(
      z.object({
        address_hex: hex,
        code: z.string(),
        error: z.null(),
        atomic_facts: z.unknown().optional(),
        atomic_facts_error: z.string().optional(),
        atomic_calls: z.unknown().optional(),
        atomic_calls_error: z.string().optional(),
      }),
    )
    .length(1),
});

// Parse one row at a time: a bad provider must not expand thousands of malformed
// records into a giant Zod issue list before the caller can reject the source.
const nativeBlock = factsSchema.shape.blocks.element;
const parseBlock = rowParser(nativeBlock, {
  operations: (id) => operationId.parse(id),
  predecessors: (id) => ordinal.parse(id),
  successors: (row) => edge.parse(row),
});
const parseOperation = rowParser(operation, {
  inputs: (row) => operation.shape.inputs.element.parse(row),
});
const parseFacts = rowParser(factsSchema, {
  blocks: parseBlock,
  operations: parseOperation,
  values: (row) => value.parse(row),
});

function preflight(facts) {
  requireFact(
    facts && typeof facts === "object",
    "Native atomic facts facet is unavailable; inspect the retained source for its reason and C",
  );
  requireFact(
    facts.schema_version === 3,
    "Unsupported native atomic facts schema version; expected 3",
  );
  requireFact(
    facts.blocks?.length > 0,
    "Native recovered graph is unavailable",
  );
  for (const [key, limit] of [
    ["blocks", 12000],
    ["operations", 12000],
    ["values", 36000],
  ])
    requireFact(
      Array.isArray(facts[key]) && facts[key].length <= limit,
      `Native ${key} exceeds resource capacity or has invalid shape`,
    );
  const inputs = facts.operations.reduce(
    (sum, op) => sum + (Array.isArray(op?.inputs) ? op.inputs.length : 0),
    0,
  );
  const members = facts.blocks.reduce(
    (sum, block) =>
      sum + (Array.isArray(block?.operations) ? block.operations.length : 0),
    0,
  );
  const edges = facts.blocks.reduce(
    (sum, block) =>
      sum +
      (Array.isArray(block?.successors) ? block.successors.length : 0) +
      (Array.isArray(block?.predecessors) ? block.predecessors.length : 0),
    0,
  );
  requireFact(
    inputs <= 50000 && members <= 12000 && edges <= 100000,
    "Native relationships exceed resource capacity",
  );
}
const readGraph = (fn) =>
  readNativeFacet(fn, "atomic_facts", "recovered IR", (raw) => {
    preflight(raw);
    return parseFacts(raw);
  });

export function parseNativeFunction(text, entry, expectedInput) {
  try {
    requireFact(
      Buffer.byteLength(text) <= NATIVE_OUTPUT_BYTES,
      "Native JSON source exceeds transport budget",
    );
    const raw = JSON.parse(text);
    requireFact(
      Array.isArray(raw?.functions) && raw.functions.length === 1,
      "Native source must describe exactly one function",
    );
    const doc = documentSchema.parse(raw),
      fn = doc.functions[0];
    if (expectedInput !== undefined && doc.binary !== expectedInput)
      throw new FactFailure(
        "subject_mismatch",
        "Native source names a different command input",
        { expected: expectedInput, observed: doc.binary },
      );
    if (fn.address_hex !== entry)
      throw new FactFailure(
        "subject_mismatch",
        "Native function entry differs from requested subject",
      );
    return {
      code: fn.code,
      language: doc.language,
      facts: readGraph(fn),
      calls: readCallFacet(fn),
    };
  } catch (error) {
    throw formatFailure(error);
  }
}