package rules

import "strings"

// BlocklistRule rejects emails from configured senders.
type BlocklistRule struct {
	emails map[string]bool
}

// NewBlocklistRule creates a blocklist rule from a list of email addresses.
func NewBlocklistRule(emails []string) *BlocklistRule {
	m := make(map[string]bool, len(emails))
	for _, e := range emails {
		m[strings.ToLower(e)] = true
	}
	return &BlocklistRule{emails: m}
}

func (r *BlocklistRule) Name() string { return "blocklist" }

func (r *BlocklistRule) Evaluate(ctx EmailContext) RuleResult {
	if r.emails[strings.ToLower(ctx.Sender)] {
		return Reject("blocked sender")
	}
	return Accept()
}