//go:build mage

package main

import (
	"os"
	"fmt"
	//"path/filepath"

	"github.com/magefile/mage/sh"
)

const (
	binary = "greet"
)

var Default = Build

// Test runs the go tests.
// To enable verbose mode set GO_TEST_VERBOSE=1.
// To enable coverage mode set GO_TEST_COVER=1.
func Test() error {
	if err := changeToProjectRoot(); err != nil {
		return fmt.Errorf("unable to begin tests; %w", err)
	}

	goTest := sh.RunCmd("go", "test")

	args := []string{"."}

	if os.Getenv("GO_TEST_VERBOSE") == "1" {
		args = append(args, "-v")
	}

	if os.Getenv("GO_TEST_COVER") == "1" {
		args = append(args, "-cover")
	}

	return goTest(args...)
}

// Lint runs golangci-lint against the code.
func Lint() error {
	if err := changeToProjectRoot(); err != nil {
		return fmt.Errorf("unable to start the lint tests; %w", err)
	}

	return sh.RunV("golangci-lint", "run", "--color", "always")
}

// Build builds the executable.
func Build() error {
	if err := changeToProjectRoot(); err != nil {
		return fmt.Errorf("unable to start building the binary; %w", err)
	}

	main := "greet.go"
	return sh.Run("go", "build", "-o", binary, main)
}

// Clean cleans the workspace.
func Clean() error {
	if err := changeToProjectRoot(); err != nil {
		return fmt.Errorf("unable to start the cleaning process; %w", err)
	}

	if err := sh.Rm(binary); err != nil {
		return err
	}

	if err := sh.Run("go", "clean", "."); err != nil {
		return err
	}

	return nil
}

func changeToProjectRoot() error {
	if err := os.Chdir("../.."); err != nil {
		return fmt.Errorf("unable to change directory; %w", err)
	}

	return nil
}