package rp

import (
	"regexp"
	"strings"
)

const (
	InlineUpdateMarker = "x-releaser-pleaser-version"
)

var (
	SemVerRegex = regexp.MustCompile(`(?<major>\d+)\.(?<minor>\d+)\.(?<patch>\d+)(-(?<preRelease>[\w.]+))?(\+(?<build>[-\w.]+))?`)
)

type Updater interface {
	UpdateContent(content, version string) string
}

type GenericUpdater struct{}

func (u *GenericUpdater) UpdateContent(content, version string) string {
	// TODO: use buffered input/output
	output := strings.Builder{}
	output.Grow(len(content))
	for _, line := range strings.Split(content, "\n") {
		if strings.Contains(line, InlineUpdateMarker) {
			// We strip the "v" prefix to avoid adding/removing it from the users input.
			line = SemVerRegex.ReplaceAllLiteralString(line, strings.TrimPrefix(version, "v"))
		}

		output.WriteString(line)
		// TODO: Fix added newline
		output.WriteByte('\n')
	}

	return output.String()
}