let traverse = require("../lib").default;
let assert = require("assert");
let parse = require("babylon").parse;

function getPath(code) {
  let ast = parse(code);
  let path;
  traverse(ast, {
    Program: function (_path) {
      path = _path;
      _path.stop();
    }
  });
  return path;
}

suite("evaluation", function () {
  suite("evaluateTruthy", function () {
    test("it should work with null", function () {
      assert.strictEqual(
        getPath("false || a.length === 0;").get("body")[0].evaluateTruthy(),
        undefined
      );
    });

    test("it should not mistake lack of confidence for falsy", function () {
      assert.strictEqual(
        getPath("foo || 'bar'").get("body")[0].evaluate().value,
        undefined
      );
    });
  });

  test("should bail out on recursive evaluation", function () {
    assert.strictEqual(
      getPath("function fn(a) { var g = a ? 1 : 2, a = g * this.foo; }").get("body.0.body.body.0.declarations.1.init").evaluate().confident,
      false
    );
  });

  test("should work with repeated, indeterminate identifiers", function () {
    assert.strictEqual(
      getPath("var num = foo(); (num > 0 && num < 100);").get("body")[1].evaluateTruthy(),
      undefined
    );
  });

  test("should work with repeated, determinate identifiers", function () {
    assert.strictEqual(
      getPath("var num = 5; (num > 0 && num < 100);").get("body")[1].evaluateTruthy(),
      true
    );
  });

  test("should deopt when var is redeclared in the same scope", function () {
    assert.strictEqual(
      getPath("var x = 2; var y = x + 2; { var x = 3 }").get("body.1.declarations.0.init").evaluate().confident,
      false
    );
  });

  test("it should not deopt vars in different scope", function () {
    const input = "var a = 5; function x() { var a = 5; var b = a + 1; } var b = a + 2";
    assert.strictEqual(
      getPath(input).get("body.1.body.body.1.declarations.0.init").evaluate().value,
      6
    );
    assert.strictEqual(
      getPath(input).get("body.2.declarations.0.init").evaluate().value,
      7
    );
  });

  test("it should not deopt let/const inside blocks", function () {
    assert.strictEqual(
      getPath("let x = 5; { let x = 1; } let y = x + 5").get("body.2.declarations.0.init").evaluate().value,
      10
    );
    const constExample = "const d = true; if (d && true || false) { const d = false; d && 5; }";
    assert.strictEqual(
      getPath(constExample).get("body.1.test").evaluate().value,
      true
    );
    assert.strictEqual(
      getPath(constExample).get("body.1.consequent.body.1").evaluate().value,
      false
    );
  });
});