//go:build mage

package main

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

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

const binaryName = "csv2excel"

func ldflags() (string, error) {
	version, err := sh.Output("git", "describe", "--tags", "--always")
	if err != nil {
		version = "dev"
	}
	commit, err := sh.Output("git", "rev-parse", "--short", "HEAD")
	if err != nil {
		commit = "none"
	}
	buildDate := time.Now().UTC().Format(time.RFC3339)
	return fmt.Sprintf(
		`-X code.beautifulmachines.dev/jakoubek/csv2excel/internal/version.Version=%s -X code.beautifulmachines.dev/jakoubek/csv2excel/internal/version.Commit=%s -X code.beautifulmachines.dev/jakoubek/csv2excel/internal/version.BuildDate=%s`,
		version, commit, buildDate,
	), nil
}

// Build builds the binary for the current platform.
func Build() error {
	switch runtime.GOOS {
	case "windows":
		return BuildWindows()
	default:
		return BuildLinux()
	}
}

// BuildLinux builds a static binary for Linux amd64.
func BuildLinux() error {
	mg.Deps(ensureDistDir)
	flags, err := ldflags()
	if err != nil {
		return err
	}
	out := filepath.Join("dist", binaryName)
	env := map[string]string{
		"GOOS":        "linux",
		"GOARCH":      "amd64",
		"CGO_ENABLED": "0",
	}
	return sh.RunWithV(env, "go", "build", "-ldflags", flags, "-o", out, ".")
}

// BuildWindows builds a binary for Windows amd64.
func BuildWindows() error {
	mg.Deps(ensureDistDir)
	flags, err := ldflags()
	if err != nil {
		return err
	}
	out := filepath.Join("dist", binaryName+".exe")
	env := map[string]string{
		"GOOS":        "windows",
		"GOARCH":      "amd64",
		"CGO_ENABLED": "0",
	}
	return sh.RunWithV(env, "go", "build", "-ldflags", flags, "-o", out, ".")
}

// Install installs the binary to $GOBIN or $GOPATH/bin.
func Install() error {
	mg.Deps(Build)
	fmt.Println("Installing", binaryName, "...")
	flags, err := ldflags()
	if err != nil {
		return err
	}
	err = sh.RunV("go", "install", "-ldflags", flags, ".")
	if err != nil {
		return err
	}
	fmt.Println("Done.")
	return nil
}

// Clean removes the dist/ directory.
func Clean() error {
	return sh.Rm("dist")
}

func ensureDistDir() error {
	return os.MkdirAll("dist", 0o755)
}