/**
 * Renders the email carrying a password reset link. `requestPasswordReset`
 * (`password-reset-service.ts`) sends it, in the instance's style and
 * language: whoever asks isn't signed in, so their own settings don't apply.
 *
 * @module
 */

import { OG_SITE_NAME } from "../config.ts";
import { i18n } from "./i18n.ts";
import {
  EmailKit,
  escMd,
  lookOf,
  mdLink,
  type RenderedEmail,
} from "./layout.ts";

/**
 * Returns the reset email of `username`, whose button opens `resetUrl`. The
 * link stays usable for `hours`, which the email states.
 */
export function renderPasswordResetEmail(
  username: string,
  resetUrl: string,
  hours: number,
): RenderedEmail {
  const markdown = [
    `# ${
      escMd(i18n._({ id: "email.reset.title", message: "Reset your password" }))
    }`,
    escMd(i18n._({
      id: "email.reset.hi",
      message: "Hi {username},",
      values: { username },
    })),
    escMd(i18n._({
      id: "email.reset.body",
      message:
        "Someone asked to reset the password of your {site} account. The button below lets you choose a new one. It works once, for {hours, plural, one {# hour} other {# hours}}.",
      values: { site: OG_SITE_NAME, hours },
    })),
    mdLink(
      i18n._({ id: "email.reset.button", message: "Reset password" }),
      resetUrl,
    ),
    `*${
      escMd(i18n._({
        id: "email.reset.fallback",
        message:
          "If the button doesn't work, paste this link into your browser:",
      }))
    }*`,
    "```\n" + resetUrl + "\n```",
    `*${
      escMd(i18n._({
        id: "email.reset.ignore",
        message:
          "If you didn't ask for this, ignore this email. Your password stays the same.",
      }))
    }*`,
    "---",
    escMd(i18n._({
      id: "email.reset.reason",
      message:
        "You're getting this email because a password reset was requested for this address.",
    })),
  ].join("\n\n");

  return new EmailKit(lookOf()).render({
    subject: i18n._({
      id: "email.reset.subject",
      message: "Reset your {site} password",
      values: { site: OG_SITE_NAME },
    }),
    preheader: i18n._({
      id: "email.reset.preheader",
      message:
        "The link works once, for {hours, plural, one {# hour} other {# hours}}.",
      values: { hours },
    }),
    markdown,
  });
}