//go:build mage

package main

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

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

const (
	binary               = "pelican"
	defaultInstallPrefix = "/usr/local"
)

var Default = Build

// Test run the go tests
// To enable verbose mode set PELICAN_TEST_VERBOSE=1.
// To enable coverage mode set PELICAN_TEST_COVER=1.
func Test() error {
	test := sh.RunCmd("go", "test")

	args := []string{"./..."}

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

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

	return test(args...)
}

// Lint runs golangci-lint against the code.
func Lint() error {
	return sh.RunV("golangci-lint", "run", "--color", "always")
}

// Build build the executable
// To rebuild packages that are already up-to-date set PELICAN_BUILD_REBUILD_ALL=1
// To enable verbose mode set PELICAN_BUILD_VERBOSE=1
func Build() error {
	main := "./cmd/" + binary
	flags := ldflags()

	build := sh.RunCmd("go", "build")

	args := []string{"-ldflags=" + flags, "-o", binary}

	if os.Getenv("PELICAN_BUILD_REBUILD_ALL") == "1" {
		args = append(args, "-a")
	}

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

	args = append(args, main)

	return build(args...)
}

func Install() error {
	mg.Deps(Build)

	installPrefix := os.Getenv("PELICAN_INSTALL_PREFIX")
	if installPrefix == "" {
		installPrefix = defaultInstallPrefix
	}

	dest := filepath.Join(installPrefix, "bin", binary)

	if err := sh.Copy(dest, binary); err != nil {
		return fmt.Errorf("unable to install %s; %w", dest, err)
	}

	fmt.Printf("%s successfully installed to %s\n", binary, dest)

	return nil
}

// Clean clean the workspace
func Clean() error {
	if err := sh.Rm(binary); err != nil {
		return err
	}

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

	testDBDir := "./test/databases"

	files, err := os.ReadDir(testDBDir)
	if err != nil {
		return err
	}

	for _, f := range files {
		filename := f.Name()
		if strings.HasSuffix(filename, ".db") {
			sh.Rm(testDBDir + "/" + filename)
		}
	}

	return nil
}

// ldflags returns the build flags.
func ldflags() string {
	ldflagsfmt := "-s -w -X main.binaryVersion=%s -X main.gitCommit=%s -X main.goVersion=%s -X main.buildTime=%s"
	buildTime := time.Now().UTC().Format(time.RFC3339)

	return fmt.Sprintf(ldflagsfmt, version(), gitCommit(), runtime.Version(), buildTime)
}

// version returns the latest git tag using git describe.
func version() string {
	version, err := sh.Output("git", "describe", "--tags")
	if err != nil {
		version = "N/A"
	}

	return version
}

// gitCommit returns the current git commit
func gitCommit() string {
	commit, err := sh.Output("git", "rev-parse", "--short", "HEAD")
	if err != nil {
		commit = "N/A"
	}

	return commit
}