package campaigns
import (
"fmt"
"strings"
)
// TemplateKey is a seasonal or custom campaign template identifier.
type TemplateKey string
const (
TemplateChristmas TemplateKey = "christmas"
TemplateBlackFriday TemplateKey = "black_friday"
TemplateSpring TemplateKey = "spring"
TemplateCustom TemplateKey = "custom"
)
type Template struct {
Key string `json:"key"`
Name string `json:"name"`
Season string `json:"season"`
DefaultSubject string `json:"default_subject"`
DefaultPrompt string `json:"default_prompt"`
Description string `json:"description"`
}
var builtInTemplates = []Template{
{
Key: string(TemplateChristmas),
Name: "Christmas",
Season: "christmas",
DefaultSubject: "Holiday picks from {{brand}}",
DefaultPrompt: "Warm Christmas email for these products. Festive, concise, clear CTA. JSON only.",
Description: "Festive seasonal campaign for holiday shoppers.",
},
{
Key: string(TemplateBlackFriday),
Name: "Black Friday",
Season: "black_friday",
DefaultSubject: "Black Friday deals from {{brand}}",
DefaultPrompt: "Urgent Black Friday email for these products. Limited-time value, no false claims, strong CTA. JSON only.",
Description: "Deal-focused Black Friday / Cyber Week campaign.",
},
{
Key: string(TemplateSpring),
Name: "Spring",
Season: "spring",
DefaultSubject: "Fresh for spring — {{brand}}",
DefaultPrompt: "Light spring email for these products. Renewal + practical benefits, clear CTA. JSON only.",
Description: "Seasonal spring refresh campaign.",
},
{
Key: string(TemplateCustom),
Name: "Custom",
Season: "custom",
DefaultSubject: "News from {{brand}}",
DefaultPrompt: "Clear marketing email for these products. Short subject, scannable body, CTA. JSON only.",
Description: "Blank slate with sensible defaults.",
},
}
func ListTemplates() []Template {
out := make([]Template, len(builtInTemplates))
copy(out, builtInTemplates)
return out
}
func GetTemplate(key string) (Template, error) {
key = strings.TrimSpace(strings.ToLower(key))
if key == "" {
key = string(TemplateCustom)
}
for _, t := range builtInTemplates {
if t.Key == key {
return t, nil
}
}
return Template{}, ErrInvalidTemplate
}
func ValidTemplateKey(key string) bool {
_, err := GetTemplate(key)
return err == nil
}
func renderSubject(tpl Template, brand string) string {
if brand == "" {
brand = "our store"
}
return strings.ReplaceAll(tpl.DefaultSubject, "{{brand}}", brand)
}
func templateHTML(subject, intro, productBlock, ctaURL, logoURL string) string {
if ctaURL == "" {
ctaURL = "#"
}
logoBlock := ""
if strings.TrimSpace(logoURL) != "" {
logoBlock = fmt.Sprintf(
`
`,
escapeAttr(logoURL),
)
}
return fmt.Sprintf(`
%s%s
%s
%s
Shop now
`, logoBlock, escapeHTML(subject), escapeHTML(intro), productBlock, escapeAttr(ctaURL))
}
func escapeHTML(s string) string {
r := strings.NewReplacer("&", "&", "<", "<", ">", ">", `"`, """)
return r.Replace(s)
}
func escapeAttr(s string) string {
return escapeHTML(s)
}