module specs.runtime.switch;

import core.util;

import math.random;

describe runtime() {
	describe _d_switch_string {
		it should_handle_empty_switch_statements {
			string foo = "hello";

			switch(foo) {
				default:
					break;
			}
		}

		it should_handle_one_case {
			string foo = "hello";

			switch(foo) {
				case "hello":
					should(true);
					break;
				default:
					should(false);
					break;
			}
		}

		it should_handle_three_cases {
			string foo = "hello";

			switch(foo) {
				case "abc":
				case "zzt":
					should(false);
					break;
				case "hello":
					should(true);
					break;
				default:
					should(false);
					break;
			}
		}

		template StringList(int idx) {
			static if (idx == 50) {
				const char[] StringList = `"` ~ IntToStr!(idx, 16) ~ `"
					`;
			}
			else {
				const char[] StringList = `"` ~ IntToStr!(idx, 16) ~ `",
					` ~ StringList!(idx+1);
			}
		}

		template StringArray() {
			const char[] StringArray = `
				string[] foo = [
				` ~ StringList!(0) ~ `
				];`;	
		}

		template CaseList(int idx) {
			static if (idx == 50) {
				const char[] CaseList = `case "` ~ IntToStr!(idx, 16) ~ `":
					picked = "` ~ IntToStr!(idx, 16) ~ `";
					break;`;
			}
			else {
				const char[] CaseList = `case "` ~ IntToStr!(idx, 16) ~ `":
					picked = "` ~ IntToStr!(idx, 16) ~ `";
					break;
				` ~ CaseList!(idx+1);
			}
		}

		template SwitchList() {
			const char[] SwitchList = `
				switch(foo[idx]) {
					` ~ CaseList!(0) ~ `
					default:
						picked = "";
						break;
				}`;
		}

		it should_handle_many_cases {

			mixin(StringArray!());

			auto r = new Random();
			for (size_t i=0; i<50; i++) {
				size_t idx = cast(size_t)r.nextLong(50);
				string picked;

				mixin(SwitchList!());

				should(picked == foo[idx]);
			}
		}

		it should_handle_empty_string {
			switch("") {
				case "":
					should(true);
					break;
				case "abc":
				case "zsdf":
				case "asdf":
				case "afsfdfas":
					should(false);
					break;
				default:
					should(false);
					break;
			}
		}
	}
}