package tests_test

import (
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"

	"git.akyoto.dev/cli/q/src/build"
	"git.akyoto.dev/go/assert"
)

var programs = []struct {
	Name     string
	Input    string
	Output   string
	ExitCode int
}{
	{"empty", "", "", 0},
	{"math", "", "", 10},
	{"precedence", "", "", 10},
	{"square-sum", "", "", 25},
	{"chained-calls", "", "", 9},
	{"nested-calls", "", "", 4},
	{"param", "", "", 3},
	{"param-multi", "", "", 21},
	{"reuse", "", "", 3},
	{"return", "", "", 6},
	{"reassign", "", "", 2},
	{"branch", "", "", 0},
	{"branch-and", "", "", 0},
	{"branch-or", "", "", 0},
	{"branch-both", "", "", 0},
	{"jump-near", "", "", 0},
	{"loop", "", "", 0},
	{"loop-lifetime", "", "", 0},
	{"remainder", "", "", 0},
}

func TestPrograms(t *testing.T) {
	for _, test := range programs {
		t.Run(test.Name, func(t *testing.T) {
			run(t, filepath.Join("programs", test.Name+".q"), test.Input, test.Output, test.ExitCode)
		})
	}
}

func BenchmarkPrograms(b *testing.B) {
	for _, test := range programs {
		b.Run(test.Name, func(b *testing.B) {
			compiler := build.New(filepath.Join("programs", test.Name+".q"))

			for i := 0; i < b.N; i++ {
				_, err := compiler.Run()
				assert.Nil(b, err)
			}
		})
	}
}

// run builds and runs the file to check if the output matches the expected output.
func run(t *testing.T, name string, input string, expectedOutput string, expectedExitCode int) {
	b := build.New(name)
	assert.True(t, len(b.Executable()) > 0)

	result, err := b.Run()
	assert.Nil(t, err)

	err = result.Write(b.Executable())
	assert.Nil(t, err)

	stat, err := os.Stat(b.Executable())
	assert.Nil(t, err)
	assert.True(t, stat.Size() > 0)

	cmd := exec.Command(b.Executable())
	cmd.Stdin = strings.NewReader(input)
	output, err := cmd.Output()
	exitCode := 0

	if err != nil {
		exitError, ok := err.(*exec.ExitError)

		if !ok {
			t.Fatal(exitError)
		}

		exitCode = exitError.ExitCode()
	}

	assert.Equal(t, exitCode, expectedExitCode)
	assert.DeepEqual(t, string(output), expectedOutput)
}