import interpret from "../../../interpretor";
import { IncompatibleTypeError } from "errors";

describe("conditional", () => {
    it("supports if-then-else with null", () => {
        expect(interpret('if null then "not null" else "null"', {})).toEqual("null");
        expect(interpret('if true then null else "false"', {})).toBeNull();
        expect(interpret("if false then true else null", {})).toBeNull();
    });
    it("supports if-then-else", () => {
        expect(interpret('if (true) then "true" else "false"', {})).toEqual("true");
        expect(interpret('if (false) then "true" else "false"', {})).toEqual("false");
        expect(() => interpret('if (false) then "notnumber" else 42', {})).toThrow(
            IncompatibleTypeError
        );
    });
    it.skip("supports case with null", () => {
        expect(interpret('case when null then "then" else "else"', {})).toEqual("else");
        expect(interpret('case when true then null else "else"', {})).toBeNull();
        expect(interpret('case when false then "then" else null', {})).toBeNull();
    });
    it.skip("supports case", () => {
        expect(interpret('case when true then "then1" else "else"', {})).toEqual("then1");
        expect(interpret('case when false then "then1" when true then "then2" else "else"', {})).toEqual(
            "then2"
        );
        expect(
            interpret('case when false then "then1" when 1 = 2 then "then2" else "else"', {})
        ).toEqual("else");
        expect(() => interpret('case when true then "then1" else 1', {})).toThrow(IncompatibleTypeError);
    });
    it("tests on the nvl function", () => {
        expect(interpret("nvl(5, 0)", {})).toEqual(5);
        expect(interpret("nvl(5, null)", {})).toEqual(5);
        expect(interpret("nvl(null, 0)", {})).toEqual(0);
        expect(interpret("nvl(null, null)", {})).toBeNull();
        expect(interpret("nvl(0, 12)", {})).toEqual(0);
        expect(interpret('nvl("foo", "bar")', {})).toEqual("foo");
        expect(interpret('nvl(null, "bar")', {})).toEqual("bar");
    });
    it("supports if-then-else with integer & number", () => {
        expect(interpret("if true then 1.1 else 0", {})).toEqual(1.1);
    });
});