package parsekit_test

// This file only provides building blocks for writing tests.
// No actual tests belong in this file.

import (
	"regexp"
	"testing"

	"git.makaay.nl/mauricem/go-parsekit"
)

// Easy access to the parsekit definitions.
var c, a, m, tok = parsekit.C, parsekit.A, parsekit.M, parsekit.T

type TokenHandlerTest struct {
	Input        string
	TokenHandler parsekit.TokenHandler
	MustMatch    bool
	Expected     string
}

func RunTokenHandlerTests(t *testing.T, testSet []TokenHandlerTest) {
	for _, test := range testSet {
		RunTokenHandlerTest(t, test)
	}
}

func RunTokenHandlerTest(t *testing.T, test TokenHandlerTest) {
	result, err := parsekit.NewMatcher(test.TokenHandler, "a match").Execute(test.Input)
	if test.MustMatch {
		if err != nil {
			t.Errorf("Test %q failed with error: %s", test.Input, err)
		} else if output := result.String(); output != test.Expected {
			t.Errorf("Test %q failed: not expected output:\nexpected: %q\nactual: %q\n", test.Input, test.Expected, output)
		}
	} else {
		if err == nil {
			t.Errorf("Test %q failed: should not match, but it did", test.Input)
		}
	}
}

type TokenMakerTest struct {
	Input        string
	TokenHandler parsekit.TokenHandler
	Expected     []parsekit.Token
}

func RunTokenMakerTest(t *testing.T, test TokenMakerTest) {
	result, err := parsekit.NewMatcher(test.TokenHandler, "a match").Execute(test.Input)
	if err != nil {
		t.Errorf("Test %q failed with error: %s", test.Input, err)
	} else {
		if len(result.Tokens()) != len(test.Expected) {
			t.Errorf("Unexpected number of tokens in output:\nexpected: %d\nactual: %d", len(test.Expected), len(result.Tokens()))
		}
		for i, expected := range test.Expected {
			actual := result.Token(i)
			if expected.Type != actual.Type {
				t.Errorf("Unexpected Type in result.Tokens[%d]:\nexpected: (%T) %s\nactual: (%T) %s", i, expected.Type, expected.Type, actual.Type, actual.Type)
			}
			if string(expected.Runes) != string(actual.Runes) {
				t.Errorf("Unexpected Runes in result.Tokens[%d]:\nexpected: %q\nactual: %q", i, expected.Runes, actual.Runes)
			}
			if expected.Value != actual.Value {
				t.Errorf("Unexpected Value in result.Tokens[%d]:\nexpected: (%T) %s\nactual: (%T) %s", i, expected.Value, expected.Value, actual.Value, actual.Value)
			}
		}
	}
}

func RunTokenMakerTests(t *testing.T, testSet []TokenMakerTest) {
	for _, test := range testSet {
		RunTokenMakerTest(t, test)
	}
}

type PanicTest struct {
	function func()
	expected string
}

func RunPanicTest(t *testing.T, p PanicTest) {
	defer func() {
		if r := recover(); r != nil {
			if !regexp.MustCompile(p.expected).MatchString(r.(string)) {
				t.Errorf("Function did panic, but unexpected panic message received:\nexpected: %q\nactual: %q\n", p.expected, r)
			}
		} else {
			t.Errorf("Function did not panic (expected panic message: %s)", p.expected)
		}
	}()
	p.function()
}

func RunPanicTests(t *testing.T, testSet []PanicTest) {
	for _, test := range testSet {
		RunPanicTest(t, test)
	}
}