package diff2

import "strings"

func processPurge(instructions ChangeList, nopurge bool) ChangeList {

	if nopurge {
		return instructions
	}

	// TODO(tlim): This can probably be done without allocations but it
	// works and I won't want to prematurely optimize.

	var msgs []string

	newinstructions := make(ChangeList, 0, len(instructions))
	for _, j := range instructions {
		if j.Type == DELETE {
			msgs = append(msgs, j.Msgs...)
			continue
		}
		newinstructions = append(newinstructions, j)
	}

	// Report what would have been purged
	if len(msgs) != 0 {
		for i := range msgs {
			msgs[i] = "NO_PURGE: Skipping " + msgs[i]
		}
		msgs = append([]string{"NO_PURGE Activated! Skipping these actions:"}, msgs...)
		newinstructions = append(newinstructions, Change{
			Type:       REPORT,
			Msgs:       msgs,
			MsgsJoined: strings.Join(msgs, "\n"),
		})
	}

	return newinstructions

}