package postcard_test

import (
	"context"
	"fmt"
	"strings"
	"testing/fstest"

	"git.golem15.com/golem15/summercms/modules/postcard"
)

// mailFS stands in for the plugin's embedded views/mail directory.
var mailFS = fstest.MapFS{
	"views/mail/welcome.htm": {Data: []byte(`subject = "Welcome, {{ .name }}"
layout = "blog"
description = "Sent after registration"
==
Hi **{{ .name }}**, thanks for joining the blog.
`)},
	"views/mail/layouts/blog.htm": {Data: []byte(`name = "Blog"
==
{{ .Content }}

-- The Acme blog
==
<div class="blog-mail">{{ .Content }}</div>
<style>{{ .brandCss }}{{ .css }}</style>
`)},
}

func ExampleMailer_Send() {
	// At boot, postcard.BootPlugin registers what pact.HasMailTemplates
	// declares; a test registers the same thing directly.
	cat := postcard.NewCatalog()
	err := cat.Register("acme.blog", mailFS,
		[]string{"acme.blog::mail.welcome"},
		map[string]string{"blog": "acme.blog::mail.layouts.blog"})
	if err != nil {
		fmt.Println(err)
		return
	}
	driver := postcard.NewMemoryDriver() // mail.driver: memory
	mailer := postcard.NewMailer(cat, driver, postcard.Options{From: "blog@example.com"})

	err = mailer.Send(context.Background(), postcard.Message{
		Template: "acme.blog::mail.welcome",
		To:       []string{"ada@example.com"},
		Vars:     map[string]any{"name": "Ada"},
	})
	if err != nil {
		fmt.Println(err)
		return
	}
	sent := driver.Messages()[0]
	fmt.Println(sent.From, sent.To, sent.Subject)
	fmt.Println(sent.Text)
	fmt.Println(strings.Contains(sent.HTML, `<div class="blog-mail"><p>Hi <strong>Ada</strong>`))

	// Header injection is refused before any driver sees the message.
	err = mailer.Send(context.Background(), postcard.Message{
		Template: "acme.blog::mail.welcome",
		To:       []string{"ada@example.com\r\nBcc: all@example.com"},
		Vars:     map[string]any{"name": "Ada"},
	})
	fmt.Println(err != nil, len(driver.Messages()))
	// Output:
	// blog@example.com [ada@example.com] Welcome, Ada
	// Hi **Ada**, thanks for joining the blog.
	//
	// -- The Acme blog
	// true
	// true 1
}