package main

import (
	"bytes"
	"context"
	"fmt"

	"git.dev.alexdunmow.com/block/core/templates"
)

// MagazineBoldEmailWrapper wraps body content in the Magazine Bold email template.
// The template is a 600px paper-toned table with a PP Editorial New wordmark,
// an ink hairline, body in Inter 16/24, and a mono colophon strip.
func MagazineBoldEmailWrapper(body string, emailCtx templates.EmailContext) string {
	var buf bytes.Buffer
	_ = magazineBoldEmailTemplate(emailCtx, body).Render(context.Background(), &buf)
	return buf.String()
}

// Hex defaults map onto the paper-pink light preset so wallets / clients that
// don't ship custom colours still resolve to the brand's paper tone.
// Spec §4 paper-pink light: background `38 30% 96%` → ~#F7F2EB
//                            foreground `0 0% 8%`   → ~#141414
//                            border     `0 0% 88%`  → ~#E0E0E0
//                            muted      `38 20% 92%`→ ~#EEE9E0
//                            mutedFg    `0 0% 40%`  → ~#666666
//                            accent     `330 95% 58%` → ~#F0298A
func mbEmailBg(ctx templates.EmailContext) string {
	if ctx.Colors.Background != "" {
		return ctx.Colors.Background
	}
	return "#F7F2EB"
}

func mbEmailFg(ctx templates.EmailContext) string {
	if ctx.Colors.Foreground != "" {
		return ctx.Colors.Foreground
	}
	return "#141414"
}

func mbEmailMuted(ctx templates.EmailContext) string {
	if ctx.Colors.Muted != "" {
		return ctx.Colors.Muted
	}
	return "#EEE9E0"
}

func mbEmailMutedFg(ctx templates.EmailContext) string {
	if ctx.Colors.MutedForeground != "" {
		return ctx.Colors.MutedForeground
	}
	return "#666666"
}

func mbEmailBorder(ctx templates.EmailContext) string {
	if ctx.Colors.Border != "" {
		return ctx.Colors.Border
	}
	return "#E0E0E0"
}

func mbEmailCard(ctx templates.EmailContext) string {
	if ctx.Colors.Card != "" {
		return ctx.Colors.Card
	}
	return "#FFFFFF"
}

// mbEmailDisplayStack is the serif fallback the wordmark falls back to in
// clients that strip @font-face (Outlook 365 web). System serifs only.
const mbEmailDisplayStack = `'PP Editorial New', Georgia, 'Times New Roman', serif`

// mbEmailBodyStack is the sans fallback used for body copy in clients that
// strip @font-face.
const mbEmailBodyStack = `'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif`

// mbEmailMonoStack is the mono fallback used for the colophon strip.
const mbEmailMonoStack = `'JetBrains Mono', 'Courier New', Courier, monospace`

// mbEmailStyleBody styles the outer body tag.
func mbEmailStyleBody(ctx templates.EmailContext) string {
	return fmt.Sprintf("background-color: %s; margin: 0; padding: 0; font-family: %s;", mbEmailBg(ctx), mbEmailBodyStack)
}

func mbEmailStyleHeader(ctx templates.EmailContext) string {
	return fmt.Sprintf("padding: 32px 40px; background-color: %s; border-bottom: 1px solid %s;", mbEmailCard(ctx), mbEmailBorder(ctx))
}

func mbEmailStyleWordmark(ctx templates.EmailContext) string {
	return fmt.Sprintf("margin: 0; font-family: %s; font-style: italic; font-weight: 200; font-size: 42px; line-height: 1; letter-spacing: -0.02em; color: %s;", mbEmailDisplayStack, mbEmailFg(ctx))
}

func mbEmailStyleBodyContent(ctx templates.EmailContext) string {
	return fmt.Sprintf("padding: 40px 48px; background-color: %s; color: %s; font-family: %s; font-size: 16px; line-height: 24px;", mbEmailCard(ctx), mbEmailFg(ctx), mbEmailBodyStack)
}

func mbEmailStyleColophon(ctx templates.EmailContext) string {
	return fmt.Sprintf("padding: 24px 48px; background-color: %s; border-top: 1px solid %s; font-family: %s; font-size: 12px; line-height: 18px; color: %s; letter-spacing: 0.08em; text-transform: uppercase;", mbEmailMuted(ctx), mbEmailBorder(ctx), mbEmailMonoStack, mbEmailMutedFg(ctx))
}