defmodule PlausibleWeb.Email do
  use Bamboo.Phoenix, view: PlausibleWeb.EmailView
  import Bamboo.PostmarkHelper

  def mailer_email_from do
    Application.get_env(:plausible, :mailer_email)
  end

  def activation_email(user, code) do
    base_email()
    |> to(user)
    |> tag("activation-email")
    |> subject("#{code} is your Plausible email verification code")
    |> render("activation_email.html", user: user, code: code)
  end

  def welcome_email(user) do
    base_email()
    |> to(user)
    |> tag("welcome-email")
    |> subject("Welcome to Plausible")
    |> render("welcome_email.html", user: user, unsubscribe: true)
  end

  def create_site_email(user) do
    base_email()
    |> to(user)
    |> tag("create-site-email")
    |> subject("Your Plausible setup: Add your website details")
    |> render("create_site_email.html", user: user, unsubscribe: true)
  end

  def site_setup_help(user, site) do
    base_email()
    |> to(user)
    |> tag("help-email")
    |> subject("Your Plausible setup: Waiting for the first page views")
    |> render("site_setup_help_email.html",
      user: user,
      site: site,
      unsubscribe: true
    )
  end

  def site_setup_success(user, site) do
    base_email()
    |> to(user)
    |> tag("setup-success-email")
    |> subject("Plausible is now tracking your website stats")
    |> render("site_setup_success_email.html",
      user: user,
      site: site,
      unsubscribe: true
    )
  end

  def check_stats_email(user) do
    base_email()
    |> to(user)
    |> tag("check-stats-email")
    |> subject("Check your Plausible website stats")
    |> render("check_stats_email.html", user: user, unsubscribe: true)
  end

  def password_reset_email(email, reset_link) do
    base_email(%{layout: nil})
    |> to(email)
    |> tag("password-reset-email")
    |> subject("Plausible password reset")
    |> render("password_reset_email.html", reset_link: reset_link)
  end

  def trial_one_week_reminder(user) do
    base_email()
    |> to(user)
    |> tag("trial-one-week-reminder")
    |> subject("Your Plausible trial expires next week")
    |> render("trial_one_week_reminder.html", user: user, unsubscribe: true)
  end

  def trial_upgrade_email(user, day, {pageviews, custom_events}) do
    suggested_plan = Plausible.Billing.Plans.suggested_plan(user, pageviews + custom_events)

    base_email()
    |> to(user)
    |> tag("trial-upgrade-email")
    |> subject("Your Plausible trial ends #{day}")
    |> render("trial_upgrade_email.html",
      user: user,
      day: day,
      custom_events: custom_events,
      usage: pageviews + custom_events,
      suggested_plan: suggested_plan,
      unsubscribe: true
    )
  end

  def trial_over_email(user) do
    base_email()
    |> to(user)
    |> tag("trial-over-email")
    |> subject("Your Plausible trial has ended")
    |> render("trial_over_email.html", user: user, unsubscribe: true)
  end

  def weekly_report(email, site, assigns) do
    base_email(%{layout: nil})
    |> to(email)
    |> tag("weekly-report")
    |> subject("#{assigns[:name]} report for #{site.domain}")
    |> render("weekly_report.html", Keyword.put(assigns, :site, site))
  end

  def spike_notification(email, site, current_visitors, sources, dashboard_link) do
    base_email()
    |> to(email)
    |> tag("spike-notification")
    |> subject("Traffic spike on #{site.domain}")
    |> render("spike_notification.html", %{
      site: site,
      current_visitors: current_visitors,
      sources: sources,
      link: dashboard_link
    })
  end

  def over_limit_email(user, usage, last_cycle, suggested_plan) do
    base_email()
    |> to(user)
    |> tag("over-limit")
    |> subject("[Action required] You have outgrown your Plausible subscription tier")
    |> render("over_limit.html", %{
      user: user,
      usage: usage,
      last_cycle: last_cycle,
      suggested_plan: suggested_plan,
      unsubscribe: true
    })
  end

  def enterprise_over_limit_internal_email(user, usage, last_cycle, site_usage, site_allowance) do
    base_email(%{layout: nil})
    |> to("enterprise@plausible.io")
    |> tag("enterprise-over-limit")
    |> subject("#{user.email} has outgrown their enterprise plan")
    |> render("enterprise_over_limit_internal.html", %{
      user: user,
      usage: usage,
      last_cycle: last_cycle,
      site_usage: site_usage,
      site_allowance: site_allowance
    })
  end

  def dashboard_locked(user, usage, last_cycle, suggested_plan) do
    base_email()
    |> to(user)
    |> tag("dashboard-locked")
    |> subject("[Action required] Your Plausible dashboard is now locked")
    |> render("dashboard_locked.html", %{
      user: user,
      usage: usage,
      last_cycle: last_cycle,
      suggested_plan: suggested_plan
    })
  end

  def yearly_renewal_notification(user) do
    date = Timex.format!(user.subscription.next_bill_date, "{Mfull} {D}, {YYYY}")

    base_email()
    |> to(user)
    |> tag("yearly-renewal")
    |> subject("Your Plausible subscription is up for renewal")
    |> render("yearly_renewal_notification.html", %{
      user: user,
      date: date,
      next_bill_amount: user.subscription.next_bill_amount,
      currency: user.subscription.currency_code
    })
  end

  def yearly_expiration_notification(user) do
    date = Timex.format!(user.subscription.next_bill_date, "{Mfull} {D}, {YYYY}")

    base_email()
    |> to(user)
    |> tag("yearly-expiration")
    |> subject("Your Plausible subscription is about to expire")
    |> render("yearly_expiration_notification.html", %{
      user: user,
      date: date
    })
  end

  def cancellation_email(user) do
    base_email()
    |> to(user.email)
    |> tag("cancelled-email")
    |> subject("Your Plausible Analytics subscription has been canceled")
    |> render("cancellation_email.html", user: user)
  end

  def new_user_invitation(invitation) do
    base_email()
    |> to(invitation.email)
    |> tag("new-user-invitation")
    |> subject("[Plausible Analytics] You've been invited to #{invitation.site.domain}")
    |> render("new_user_invitation.html",
      invitation: invitation
    )
  end

  def existing_user_invitation(invitation) do
    base_email()
    |> to(invitation.email)
    |> tag("existing-user-invitation")
    |> subject("[Plausible Analytics] You've been invited to #{invitation.site.domain}")
    |> render("existing_user_invitation.html",
      invitation: invitation
    )
  end

  def ownership_transfer_request(invitation, new_owner_account) do
    base_email()
    |> to(invitation.email)
    |> tag("ownership-transfer-request")
    |> subject("[Plausible Analytics] Request to transfer ownership of #{invitation.site.domain}")
    |> render("ownership_transfer_request.html",
      invitation: invitation,
      new_owner_account: new_owner_account
    )
  end

  def invitation_accepted(invitation) do
    base_email()
    |> to(invitation.inviter.email)
    |> tag("invitation-accepted")
    |> subject(
      "[Plausible Analytics] #{invitation.email} accepted your invitation to #{invitation.site.domain}"
    )
    |> render("invitation_accepted.html",
      user: invitation.inviter,
      invitation: invitation
    )
  end

  def invitation_rejected(invitation) do
    base_email()
    |> to(invitation.inviter.email)
    |> tag("invitation-rejected")
    |> subject(
      "[Plausible Analytics] #{invitation.email} rejected your invitation to #{invitation.site.domain}"
    )
    |> render("invitation_rejected.html",
      user: invitation.inviter,
      invitation: invitation
    )
  end

  def ownership_transfer_accepted(invitation) do
    base_email()
    |> to(invitation.inviter.email)
    |> tag("ownership-transfer-accepted")
    |> subject(
      "[Plausible Analytics] #{invitation.email} accepted the ownership transfer of #{invitation.site.domain}"
    )
    |> render("ownership_transfer_accepted.html",
      user: invitation.inviter,
      invitation: invitation
    )
  end

  def ownership_transfer_rejected(invitation) do
    base_email()
    |> to(invitation.inviter.email)
    |> tag("ownership-transfer-rejected")
    |> subject(
      "[Plausible Analytics] #{invitation.email} rejected the ownership transfer of #{invitation.site.domain}"
    )
    |> render("ownership_transfer_rejected.html",
      user: invitation.inviter,
      invitation: invitation
    )
  end

  def site_member_removed(membership) do
    base_email()
    |> to(membership.user.email)
    |> tag("site-member-removed")
    |> subject("[Plausible Analytics] Your access to #{membership.site.domain} has been revoked")
    |> render("site_member_removed.html",
      user: membership.user,
      membership: membership
    )
  end

  def import_success(user, site) do
    base_email()
    |> to(user)
    |> tag("import-success-email")
    |> subject("Google Analytics data imported for #{site.domain}")
    |> render("google_analytics_import.html", %{
      site: site,
      link: PlausibleWeb.Endpoint.url() <> "/" <> URI.encode_www_form(site.domain),
      user: user,
      success: true
    })
  end

  def import_failure(user, site) do
    base_email()
    |> to(user)
    |> tag("import-failure-email")
    |> subject("Google Analytics import failed for #{site.domain}")
    |> render("google_analytics_import.html", %{
      user: user,
      site: site,
      success: false
    })
  end

  def error_report(reported_by, trace_id, feedback) do
    Map.new()
    |> Map.put(:layout, nil)
    |> base_email()
    |> to("bugs@plausible.io")
    |> put_param("ReplyTo", reported_by)
    |> tag("sentry")
    |> subject("Feedback to Sentry Trace #{trace_id}")
    |> render("error_report_email.html", %{
      reported_by: reported_by,
      feedback: feedback,
      trace_id: trace_id
    })
  end

  def base_email(), do: base_email(%{layout: "base_email.html"})

  def base_email(%{layout: layout}) do
    mailer_from = Application.get_env(:plausible, :mailer_email)

    new_email()
    |> put_param("TrackOpens", false)
    |> from(mailer_from)
    |> maybe_put_layout(layout)
  end

  defp maybe_put_layout(email, nil), do: email

  defp maybe_put_layout(email, layout) do
    put_html_layout(email, {PlausibleWeb.LayoutView, layout})
  end
end