use i18n::{UiLocale, catalog};
use maud::Markup;
use maud::html;

use super::{append_query, mail_shell, url_join};

pub fn mail_verify_code(
    code: &str,
    minutes: u64,
    purpose: &str,
    link: Option<&str>,
    locale: UiLocale,
) -> Markup {
    let body = html! {
        h1 style="font-size:24px;font-weight:700;margin:0 0 8px;" { (purpose) }
        p style="color:#374151;margin:0 0 8px;" { (catalog::verify_body(locale, minutes)) }
        div class="code" { (code) }
        @if let Some(url) = link {
            p style="margin:24px 0 0;" {
                a href=(url) class="btn" { (catalog::verify_verify_button(locale)) }
            }
            p class="muted" style="margin:16px 0 0;" {
                (catalog::link_fallback(locale))
            }
            p style="word-break:break-all;font-size:13px;color:#2563eb;margin:4px 0 0;" { (url) }
        }
        p class="muted" style="margin:16px 0 0;" {
            (catalog::ignore_if_unrequested(locale))
        }
    };
    mail_shell(purpose, body, locale)
}

pub fn render(vars: &serde_json::Value) -> Markup {
    let code = vars.get("code").and_then(|v| v.as_str()).unwrap_or("");
    let minutes = vars.get("minutes").and_then(|v| v.as_u64()).unwrap_or(0);
    let purpose = vars
        .get("purpose")
        .and_then(|v| v.as_str())
        .unwrap_or("Verification");
    let link = build_link(vars);
    // Templates registered through `render_and_send` receive the already
    // localized `purpose`; the locale only drives the surrounding chrome.
    let locale = vars
        .get("locale")
        .and_then(|v| v.as_str())
        .and_then(UiLocale::parse)
        .unwrap_or(UiLocale::En);
    mail_verify_code(code, minutes, purpose, link.as_deref(), locale)
}

fn build_link(vars: &serde_json::Value) -> Option<String> {
    let base_url = vars.get("base_url").and_then(|v| v.as_str())?;
    let email = vars.get("email").and_then(|v| v.as_str())?;
    let temp_id = vars.get("temp_id").and_then(|v| v.as_str())?;
    let code = vars.get("code").and_then(|v| v.as_str()).unwrap_or("");
    let mut query = vec![("email", email), ("temp_id", temp_id), ("code", code)];
    // Optional slug (signup / password_reset / ...); the human-readable
    // `purpose` var is a heading and must not leak into the URL.
    let purpose_slug;
    if let Some(slug) = vars.get("purpose_slug").and_then(|v| v.as_str()) {
        purpose_slug = slug;
        query.push(("purpose", purpose_slug));
    }
    Some(append_query(
        &url_join(base_url, "/auth/verify-email"),
        &query,
    ))
}