package main

import (
	"time"
)

func combine(x, y Change) Change {
	x.Count++
	if x.Body == "" {
		x.Body = y.Body
	} else {
		x.Body += " " + y.Body
	}
	x.EndDate = y.Date

	return x
}

func changeEqual(x, y Change) bool {
	return x.Page == y.Page && x.Date.Truncate(24*time.Hour) == y.Date.Truncate(24*time.Hour)
}

func groupRecentChanges(changes []Change) int {
	if len(changes) <= 1 {
		return 0
	}

	f := len(changes) - 1
	i := f - 1

	for {
		if changeEqual(changes[f], changes[i]) {
			changes[f] = combine(changes[f], changes[i])
		} else {
			f--
			changes[f] = changes[i]
		}

		if i <= 0 {
			break
		}

		i--
	}

	return f
}