defmodule MicrowavepropWeb.SubmitLive.CsvUploadComponent do
  @moduledoc false
  use MicrowavepropWeb, :html

  @doc false
  @spec csv_upload_form(map()) :: Phoenix.LiveView.Rendered.t()
  def csv_upload_form(assigns) do
    ~H"""
    <div class="space-y-6">
      <div class="alert text-sm">
        <div>
          <p class="mb-2">Upload a CSV file with multiple contacts. Columns:</p>
          <code class="text-xs">
            station1, station2, grid1, grid2, band, mode, qso_timestamp, notes
          </code>
          <ul class="list-disc list-outside pl-5 mt-2 space-y-1 text-base-content/60">
            <li>
              Timestamps in most formats accepted (e.g. <code>2024-06-15T14:30:00Z</code>, <code>6/15/2024 2:30 PM</code>, <code>2024-06-15 14:30</code>). All times assumed UTC.
            </li>
            <li>
              Grid squares should be as detailed as possible (8 characters preferred, e.g. EM12kp37)
            </li>
            <li>Band in MHz (e.g. 10000, 24000)</li>
            <li>
              Mode is <strong>optional</strong> — omit the <code>mode</code> column entirely
              (6 columns total) or leave its value blank.
            </li>
            <li>
              Notes is <strong>optional</strong> — free-form operator commentary up to
              2000 characters. Leave the cell blank to store NULL.
            </li>
          </ul>
          <p class="mt-2">
            <a href="/downloads/sample_contacts.csv" download class="link link-primary">
              <.icon name="hero-arrow-down-tray" class="w-4 h-4" /> Download sample CSV
            </a>
          </p>
        </div>
      </div>

      <form id="csv-upload-form" phx-submit="upload_csv" phx-change="validate_csv" class="space-y-4">
        <div class="fieldset mb-2">
          <label>
            <span class="label mb-1">CSV File</span>
            <.live_file_input upload={@uploads.csv} class="file-input file-input-bordered w-full" />
          </label>
        </div>

        <div :for={entry <- @uploads.csv.entries} class="space-y-1">
          <div class="flex items-center justify-between text-xs tabular-nums">
            <span class="truncate pr-2">{entry.client_name}</span>
            <span class="flex items-center gap-2 shrink-0">
              <span :if={uploading?(entry)}>{entry.progress}%</span>
              <button
                type="button"
                class="btn btn-ghost btn-xs"
                phx-click="cancel_csv_upload"
                phx-value-ref={entry.ref}
                aria-label="Cancel upload"
              >
                <.icon name="hero-x-mark" class="w-4 h-4" />
              </button>
            </span>
          </div>
          <progress
            :if={uploading?(entry)}
            class="progress progress-primary w-full"
            value={entry.progress}
            max="100"
          ></progress>
          <div :for={err <- upload_errors(@uploads.csv, entry)} class="text-xs text-error">
            {error_to_string(err)}
          </div>
        </div>

        <div :for={err <- upload_errors(@uploads.csv)} class="text-xs text-error">
          {error_to_string(err)}
        </div>

        <%= if @current_user do %>
          <input type="hidden" name="submitter_email" value={@current_user.email} />
        <% end %>

        <label class="flex items-center gap-2 cursor-pointer mt-2">
          <input type="checkbox" name="private" value="true" class="checkbox checkbox-sm" />
          <span class="text-sm">Private — only visible to me and administrators</span>
        </label>

        <div class="mt-6">
          <button type="submit" class="btn btn-primary btn-lg w-full sm:w-auto">
            <.icon name="hero-arrow-up-tray" class="w-5 h-5" /> Upload Contacts
          </button>
        </div>
      </form>
    </div>
    """
  end

  defp error_to_string(:too_large), do: "File is too large"
  defp error_to_string(:too_many_files), do: "Only one file allowed"
  defp error_to_string(:not_accepted), do: "File type not accepted"
  defp error_to_string(other), do: to_string(other)

  # An upload entry is actively streaming when its progress is partway
  # between 0 and 100. With `auto_upload: false` entries sit at
  # `progress: 0` after the user picks a file and only start streaming
  # when the form is submitted, so gating the progress bar and percent
  # text on the 0 < progress < 100 window keeps them hidden until the
  # upload is actually in flight.
  defp uploading?(%{progress: progress}), do: progress > 0 and progress < 100
  defp uploading?(_), do: false
end