//go:build mage

package main

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

	"github.com/carlmjohnson/requests"
	"github.com/magefile/mage/sh"
	"golang.org/x/exp/slog"
)

var (
	GoReleaser = sh.RunCmd("goreleaser")
	GoInstall  = sh.RunCmd("go", "install")
	GoBuild    = sh.RunCmd("go", "build")
	GoRun      = sh.RunCmd("go", "run")
)

func getLatestReleaseTag(ctx context.Context, repo string) (tag string, err error) {
	type release struct {
		TagName string `json:"tag_name"`
	}

	var releases []release

	err = requests.
		URL(fmt.Sprintf("https://%s", path.Join("api.github.com/repos", repo, "releases"))).
		ToJSON(&releases).
		Fetch(ctx)

	if err != nil {
		return "", err
	}

	if len(releases) < 1 {
		return "", fmt.Errorf("no release found for repo %s", repo)
	}

	return releases[0].TagName, nil
}

func ensureURLTool(ctx context.Context, toolName, downloadURL string) error {
	return checkForTool(toolName, func() error {
		return requests.
			URL(downloadURL).
			ToFile(filepath.Join("/", "usr", "local", "bin", toolName)).
			Fetch(ctx)
	})
}

func ensureGoTool(toolName, importPath, version string) error {
	return checkForTool(toolName, func() error {
		toolToInstall := fmt.Sprintf("%s@%s", importPath, version)
		slog.Info("Installing Go tool", slog.String("toolToInstall", toolToInstall))
		return GoInstall(toolToInstall)
	})
}

func checkForTool(toolName string, fallbackAction func() error) error {
	if _, err := exec.LookPath(toolName); err != nil {
		slog.Warn("tool is missing", slog.String("toolName", toolName))
		return fallbackAction()
	}

	return nil
}