// Copyright 2020 the Drone Authors. All rights reserved.
// Use of this source code is governed by the Blue Oak Model License
// that can be found in the LICENSE file.

package plugin

import (
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"os"
	"os/exec"
)

type GetLatestGitTagOption func() error

var FetchTags = func() error {
	err := exec.Command("git", "fetch", "--tags")

	return err.Err
}

func getLatestGitTag(options ...GetLatestGitTagOption) (string, error) {
	for _, opt := range options {
		err := opt()
		if err != nil {
			return "", err
		}
	}

	tag, err := exec.Command("git", "describe", "--tags", "--abbrev=0").Output()

	if err != nil {
		return "", fmt.Errorf("error getting git tag %w", err)
	}

	return string(tag), err
}

func writeCard(path, schema string, card interface{}) {
	data, _ := json.Marshal(map[string]interface{}{
		"schema": schema,
		"data":   card,
	})
	switch {
	case path == "/dev/stdout":
		writeCardTo(os.Stdout, data)
	case path == "/dev/stderr":
		writeCardTo(os.Stderr, data)
	case path != "":
		os.WriteFile(path, data, 0644)
	}
}

func writeCardTo(out io.Writer, data []byte) {
	encoded := base64.StdEncoding.EncodeToString(data)
	io.WriteString(out, "\u001B]1338;")
	io.WriteString(out, encoded)
	io.WriteString(out, "\u001B]0m")
	io.WriteString(out, "\n")
}