package service

import (
	"strconv"
	"strings"
)

type gerritMeta struct {
	patchSet int64
	changeId string
	commit   string
}

// parseGerritMetadata takes a NoteDB metadata entry and extracts info from it.
func parseGerritMetadata(messages []string) *gerritMeta {
	meta := &gerritMeta{}

	for _, message := range messages {
		for _, line := range strings.Split(message, "\n") {
			line = strings.TrimSpace(line)
			if len(line) == 0 {
				continue
			}

			parts := strings.SplitN(line, ":", 2)
			if len(parts) < 2 {
				continue
			}
			k, v := parts[0], strings.TrimSpace(parts[1])

			switch k {
			case "Patch-set":
				n, err := strconv.ParseInt(v, 10, 64)
				if err != nil {
					continue
				}
				meta.patchSet = n
			case "Change-id":
				meta.changeId = v
			case "Commit":
				meta.commit = v
			}
		}
	}

	if meta.patchSet == 0 {
		return nil
	}
	if meta.changeId == "" {
		return nil
	}
	if meta.commit == "" {
		return nil
	}
	return meta
}