//go:build mage
// +build mage

package main

import (
	"errors"
	"fmt"
	"os"
	"os/exec"
	"time"

	"github.com/magefile/mage/mg" // mg contains helpful utility functions, like Deps
)

var (
	// Default target to run when none is specified
	// If not set, running mage will list available targets
	Default        = Build
	app     string = "tar-split"
	Stdout         = ourStdout
	Stderr         = ourStderr

	golangcilintVersion = "v1.61.0"

	cleanFiles = []string{}
)

// Run all-the-things
func All() error {
	mg.Deps(Vet)
	mg.Deps(Test)
	mg.Deps(Build)
	mg.Deps(Lint)
	return nil
}

// A build step that requires additional params, or platform specific steps for example
func Build() error {
	mg.Deps(InstallDeps)
	fmt.Println("Building...")
	cmd := exec.Command("go", "build", "-v", "-o", app, "./cmd/tar-split")
	cmd.Stdout = Stdout
	cmd.Stderr = Stderr
	return cmd.Run()
}

// Vet the codes
func Vet() error {
	fmt.Println("go vet...")
	cmd := exec.Command("go", "vet", "./...")
	cmd.Stdout = Stdout
	cmd.Stderr = Stderr
	return cmd.Run()
}

// Run the Linters
func Lint() error {
	mg.Deps(InstallToolsLint)
	fmt.Println("Linting...")
	cmd := exec.Command("golangci-lint", "run")
	cmd.Stdout = Stdout
	cmd.Stderr = Stderr
	return cmd.Run()
}

// Run the tests available
func Test() error {
	fmt.Println("Testing...")
	cmd := exec.Command("go", "test", "-cover", "-v", "-bench", "'.'", "-benchmem", "./...")
	cmd.Stdout = Stdout
	cmd.Stderr = Stderr
	return cmd.Run()
}

// A custom install step if you need your bin someplace other than go/bin
func Install() error {
	mg.Deps(Build)
	fmt.Println("Installing...")
	return os.Rename(app, "/usr/local/bin/"+app)
}

func init() {
	cleanFiles = append(cleanFiles, ".install.deps") // sloppy
}

// Manage your deps, or running package managers.
func InstallDeps() error {
	const fpath = ".install.deps"
	success := false
	defer func() {
		if success {
			fd, err := os.Create(fpath)
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
			}
			fd.Close()
		}
	}()
	if IsFresh(fpath, time.Now()) {
		return nil
	}

	mg.Deps(Tidy)
	fmt.Println("Installing Deps...")
	cmd := exec.Command("go", "get", "./...")
	cmd.Stdout = Stdout
	cmd.Stderr = Stderr
	err := cmd.Run()
	if err != nil {
		return err
	}
	success = true
	return nil
}

// Tools used during build/dev/test
func InstallTools() error {
	mg.Deps(InstallToolsLint)
	return nil
}

func InstallToolsLint() error {
	fmt.Println("Installing Deps...")
	cmd := exec.Command("go", "install", "github.com/golangci/golangci-lint/cmd/golangci-lint@"+golangcilintVersion)
	cmd.Stdout = Stdout
	cmd.Stderr = Stderr
	return cmd.Run()
}

// Tidy go modules
func Tidy() error {
	fmt.Println("Tidy up...")
	cmd := exec.Command("go", "mod", "tidy")
	cmd.Stdout = Stdout
	cmd.Stderr = Stderr
	return cmd.Run()
}

// Clean up after yourself
func Clean() {
	fmt.Println("Cleaning...")
	os.RemoveAll(app)
	for _, fpath := range cleanFiles {
		os.RemoveAll(fpath)
	}
}

// IsFresh checks if `fpath` exists (therefore `false`, it is not fresh) or if
// `fpath` is _newer_ than `t` (true, as in it's freshly built)
func IsFresh(fpath string, t time.Time) bool {
	fi, err := os.Stat(fpath)
	if err != nil && errors.Is(err, os.ErrNotExist) {
		return false
	}
	return fi.ModTime().Before(t)
}