import { execFile, execFileSync } from "node:child_process";
import { mkdir } from "node:fs/promises";
import { join } from "node:path";
import { promisify } from "node:util";
import { beforeAll, expect, test } from "vitest";

const execFileAsync = promisify(execFile);
const testDir = import.meta.dirname;
const bin = join(testDir, "build", "test_json");

// Built with ASan + the RC audit: a clean exit also proves the checked-dynamic tree's
// recursive ownership — including trees abandoned mid-parse by syntax
// errors — leaks nothing and frees nothing twice.
beforeAll(async () => {
  await mkdir(join(testDir, "build"), { recursive: true });
  await execFileAsync("clang", [
    "-std=c11",
    "-O1",
    "-Wall",
    "-Wextra",
    "-fsanitize=address",
    "-DSCR_RC_AUDIT",
    "-I",
    join(testDir, "../src"),
    "-o",
    bin,
    join(testDir, "test_json.c"),
    join(testDir, "../src/scr_json.c"),
    join(testDir, "../src/scr_bigint.c"),
    join(testDir, "../src/scr_string.c"),
    join(testDir, "../src/scr_array.c"),
    join(testDir, "../src/scr_arena.c"),
    join(testDir, "../src/scr_map.c"),
    join(testDir, "../src/scr_exception.c"),
    join(testDir, "../src/scr_error.c"),
    join(testDir, "../src/scr_number.c"),
    join(testDir, "../src/scr_console.c"),
    join(testDir, "../src/scr_closure.c"),
    join(testDir, "../src/scr_object.c"),
    join(testDir, "../src/scr_union.c"),
    join(testDir, "../src/scr_cycle.c"),
    join(testDir, "../src/scr_alloc.c"),
    join(testDir, "../src/scr_lib.c"),
    join(testDir, "../src/scr_hash.c"),
    join(testDir, "../src/scr_url.c"),
    join(testDir, "../src/scr_url_params.c"),
    join(testDir, "../src/scr_path.c"),
    join(testDir, "../src/scr_bytes.c"),
    join(testDir, "../src/scr_shared.c"),
    ...(process.platform === "linux" ? ["-D_GNU_SOURCE", "-lm"] : []),
  ]);
});

// The C side parses/inspects dyn values as checks and routes each expected
// failure through scr_exc_print_uncaught. Parse failures are SyntaxError
// INSTANCES (the depth cap a RangeError, dynCheck failures TypeErrors), so
// every uncaught line renders "name: message"; the JSON syntax error
// messages are Node's (V8's wording, positions and line/column).
test("json runtime: parser, dyn, dynCheck failure path, stringify buffer", async () => {
  const { stdout, stderr } = await execFileAsync(bin);
  expect(stdout).toMatch(/^(\d+)\/\1 checks passed\n$/);
  expect(stderr).toBe(
    [
      `Uncaught SyntaxError: Unexpected end of JSON input`,
      `Uncaught SyntaxError: Unexpected end of JSON input`,
      `Uncaught SyntaxError: Expected property name or '}' in JSON at position 1 (line 1 column 2)`,
      `Uncaught SyntaxError: Unexpected end of JSON input`,
      `Uncaught SyntaxError: Expected ',' or ']' after array element in JSON at position 3 (line 1 column 4)`,
      `Uncaught SyntaxError: Expected ':' after property name in JSON at position 4 (line 1 column 5)`,
      `Uncaught SyntaxError: Expected double-quoted property name in JSON at position 7 (line 1 column 8)`,
      `Uncaught SyntaxError: Expected property name or '}' in JSON at position 1 (line 1 column 2)`,
      `Uncaught SyntaxError: Unterminated string in JSON at position 13 (line 1 column 14)`,
      `Uncaught SyntaxError: Bad escaped character in JSON at position 6 (line 1 column 7)`,
      `Uncaught SyntaxError: Bad control character in string literal in JSON at position 6 (line 1 column 7)`,
      `Uncaught SyntaxError: Bad Unicode escape in JSON at position 5 (line 1 column 6)`,
      `Uncaught SyntaxError: No number after minus sign in JSON at position 1 (line 1 column 2)`,
      `Uncaught SyntaxError: Unterminated fractional number in JSON at position 2 (line 1 column 3)`,
      `Uncaught SyntaxError: Exponent part is missing a number in JSON at position 3 (line 1 column 4)`,
      `Uncaught SyntaxError: Unexpected non-whitespace character after JSON at position 2 (line 1 column 3)`,
      `Uncaught SyntaxError: Unexpected end of JSON input`,
      `Uncaught RangeError: Maximum call stack size exceeded`,
      `Uncaught TypeError: expected number at $.items[2].price, got string`,
      `Uncaught TypeError: expected object at $, got undefined`,
      ``,
    ].join("\n"),
  );
});

function zigOnPath(): boolean {
  try {
    execFileSync("zig", ["version"], { stdio: "ignore" });
    return true;
  } catch {
    return false;
  }
}

// 32-bit uintptr_t: the weak-collection hashes mix in 64 bits, so no shift
// exceeds the width of its operand on wasm32.
test.skipIf(!zigOnPath())("json runtime builds for wasm32 without oversized shifts", async () => {
  await execFileAsync("zig", [
    "cc",
    "-target",
    "wasm32-wasi",
    "-std=c11",
    "-O2",
    "-D_GNU_SOURCE",
    "-D_WASI_EMULATED_SIGNAL",
    "-D_WASI_EMULATED_PROCESS_CLOCKS",
    "-Werror=shift-count-overflow",
    "-c",
    "-o",
    join(testDir, "build", "scr_json.wasm32.o"),
    join(testDir, "../src/scr_json.c"),
  ]);
});