package templates

import (
	"context"
	"io"
)

// HTMLComponent is the generic interface for rendered template output.
// Both templ.Component and pongo2 engine output satisfy this interface.
type HTMLComponent interface {
	Render(ctx context.Context, w io.Writer) error
}

// TemplateFunc is the signature for template functions loaded from plugins.
type TemplateFunc func(ctx context.Context, doc map[string]any) HTMLComponent

// PageTemplateMeta provides metadata about a page template within a system template.
type PageTemplateMeta struct {
	Key         string
	Title       string
	Description string
	Slots       []string
}

// SystemTemplateMeta provides metadata about a system template (theme).
type SystemTemplateMeta struct {
	Key         string
	Title       string
	Description string
}

// EmailWrapperFunc wraps body content in a branded email template.
type EmailWrapperFunc func(body string, ctx EmailContext) string

// EmailContext provides data for email wrapper rendering.
type EmailContext struct {
	Colors         EmailColors
	SiteSettings   EmailSiteData
	UnsubscribeURL string
	PreviewText    string
}

// EmailColors contains theme colors converted to hex for email inlining.
type EmailColors struct {
	Primary             string
	PrimaryForeground   string
	Secondary           string
	SecondaryForeground string
	Background          string
	Foreground          string
	Muted               string
	MutedForeground     string
	Border              string
	Card                string
	CardForeground      string
}

// EmailSiteData contains site information for email rendering.
type EmailSiteData struct {
	SiteName     string
	LogoURL      string
	SiteURL      string
	SupportEmail string
}