//go:build mage

// Package main provides build targets for rampage.
// Targets follow the same style as other projects: Default builds, Test runs tests,
// Bench runs benchmarks, Install copies binary to GOPATH/bin.
package main

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

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

const binaryName = "rampage"

// Default builds the project.
func Default() {
	mg.Deps(Build)
}

// Build compiles the binary.
func Build() error {
	return sh.RunV("go", "build", "-o", binaryName, "./cmd/rampage")
}

// Test runs all unit tests.
func Test() error {
	return sh.RunV("go", "test", "./...")
}

// Bench runs all benchmarks in the cpu package.
func Bench() error {
	return sh.RunV("go", "test", "-bench=.", "-benchmem", "./internal/cpu/...")
}

// Install builds and copies the binary to GOPATH/bin.
func Install() error {
	mg.Deps(Build)

	gopath := os.Getenv("GOPATH")
	if gopath == "" {
		home, err := os.UserHomeDir()
		if err != nil {
			return fmt.Errorf("get home dir: %w", err)
		}
		gopath = filepath.Join(home, "go")
	}

	binDir := filepath.Join(gopath, "bin")
	if err := os.MkdirAll(binDir, 0755); err != nil {
		return fmt.Errorf("create bin dir: %w", err)
	}

	return sh.RunV("cp", "-v", binaryName, binDir)
}

// Uninstall removes the binary from GOPATH/bin.
func Uninstall() error {
	gopath := os.Getenv("GOPATH")
	if gopath == "" {
		home, err := os.UserHomeDir()
		if err != nil {
			return fmt.Errorf("get home dir: %w", err)
		}
		gopath = filepath.Join(home, "go")
	}

	binPath := filepath.Join(gopath, "bin", binaryName)
	return os.Remove(binPath)
}