defmodule BerrypodWeb.CoreComponents do
  @moduledoc """
  Provides core UI components.

  At first glance, this module may seem daunting, but its goal is to provide
  core building blocks for your application, such as tables, forms, and
  inputs. The components consist mostly of markup and are well-documented
  with doc strings and declarative assigns. You may customize and style
  them in any way you want, based on your application growth and needs.

  Styled with custom admin CSS (`assets/css/admin/components.css`).

    * [Heroicons](https://heroicons.com) - see `icon/1` for usage.

    * [Phoenix.Component](https://hexdocs.pm/phoenix_live_view/Phoenix.Component.html) -
      the component system used by Phoenix. Some components, such as `<.link>`
      and `<.form>`, are defined there.

  """
  use Phoenix.Component
  use Gettext, backend: BerrypodWeb.Gettext

  alias Phoenix.LiveView.JS

  @doc """
  Renders flash notices.

  ## Examples

      <.flash kind={:info} flash={@flash} />
      <.flash kind={:info} phx-mounted={show("#flash")}>Welcome Back!</.flash>
  """
  attr :id, :string, doc: "the optional id of flash container"
  attr :flash, :map, default: %{}, doc: "the map of flash messages to display"
  attr :title, :string, default: nil
  attr :kind, :atom, values: [:info, :error], doc: "used for styling and flash lookup"
  attr :rest, :global, doc: "the arbitrary HTML attributes to add to the flash container"

  slot :inner_block, doc: "the optional inner block that renders the flash message"

  def flash(assigns) do
    assigns = assign_new(assigns, :id, fn -> "flash-#{assigns.kind}" end)

    ~H"""
    <div
      :if={msg = render_slot(@inner_block) || Phoenix.Flash.get(@flash, @kind)}
      id={@id}
      phx-click={JS.push("lv:clear-flash", value: %{key: @kind}) |> hide("##{@id}")}
      role="alert"
      class="admin-toast"
      {@rest}
    >
      <div class={[
        "admin-alert",
        @kind == :info && "admin-alert-info",
        @kind == :error && "admin-alert-error"
      ]}>
        <.icon :if={@kind == :info} name="hero-information-circle" class="size-5 shrink-0" />
        <.icon :if={@kind == :error} name="hero-exclamation-circle" class="size-5 shrink-0" />
        <div>
          <p :if={@title} class="admin-alert-title">{@title}</p>
          <p>{msg}</p>
        </div>
        <div class="admin-alert-spacer" />
        <button type="button" class="admin-alert-close" aria-label={gettext("close")}>
          <.icon name="hero-x-mark" class="size-5" />
        </button>
      </div>
    </div>
    """
  end

  @doc """
  Renders a button with navigation support.

  ## Examples

      <.button>Send!</.button>
      <.button phx-click="go" variant="primary">Send!</.button>
      <.button navigate={~p"/"}>Home</.button>
  """
  attr :rest, :global, include: ~w(href navigate patch method download name value disabled)
  attr :class, :string
  attr :variant, :string, values: ~w(primary outline)
  slot :inner_block, required: true

  def button(%{rest: rest} = assigns) do
    variants = %{
      "primary" => "admin-btn-primary",
      "outline" => "admin-btn-outline",
      nil => "admin-btn-primary admin-btn-soft"
    }

    variant_class = Map.fetch!(variants, assigns[:variant])

    assigns =
      assign(assigns, :class, [
        "admin-btn",
        variant_class,
        assigns[:class]
      ])

    if rest[:href] || rest[:navigate] || rest[:patch] do
      ~H"""
      <.link class={@class} {@rest}>
        {render_slot(@inner_block)}
      </.link>
      """
    else
      ~H"""
      <button class={@class} {@rest}>
        {render_slot(@inner_block)}
      </button>
      """
    end
  end

  @doc """
  Renders an input with label and error messages.

  A `Phoenix.HTML.FormField` may be passed as argument,
  which is used to retrieve the input name, id, and values.
  Otherwise all attributes may be passed explicitly.

  ## Types

  This function accepts all HTML input types, considering that:

    * You may also set `type="select"` to render a `<select>` tag

    * `type="checkbox"` is used exclusively to render boolean values

    * For live file uploads, see `Phoenix.Component.live_file_input/1`

  See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input
  for more information. Unsupported types, such as hidden and radio,
  are best written directly in your templates.

  ## Examples

      <.input field={@form[:email]} type="email" />
      <.input name="my-input" errors={["oh no!"]} />
  """
  attr :id, :any, default: nil
  attr :name, :any
  attr :label, :string, default: nil
  attr :value, :any

  attr :type, :string,
    default: "text",
    values: ~w(checkbox color date datetime-local email file month number password
               search select tel text textarea time url week)

  attr :field, Phoenix.HTML.FormField,
    doc: "a form field struct retrieved from the form, for example: @form[:email]"

  attr :errors, :list, default: []
  attr :checked, :boolean, doc: "the checked flag for checkbox inputs"
  attr :prompt, :string, default: nil, doc: "the prompt for select inputs"
  attr :options, :list, doc: "the options to pass to Phoenix.HTML.Form.options_for_select/2"
  attr :multiple, :boolean, default: false, doc: "the multiple flag for select inputs"
  attr :class, :string, default: nil, doc: "the input class to use over defaults"
  attr :error_class, :string, default: nil, doc: "the input error class to use over defaults"

  attr :rest, :global,
    include: ~w(accept autocomplete capture cols disabled form list max maxlength min minlength
                multiple pattern placeholder readonly required rows size step)

  def input(%{field: %Phoenix.HTML.FormField{} = field} = assigns) do
    errors = if Phoenix.Component.used_input?(field), do: field.errors, else: []

    assigns
    |> assign(field: nil, id: assigns.id || field.id)
    |> assign(:errors, Enum.map(errors, &translate_error(&1)))
    |> assign_new(:name, fn -> if assigns.multiple, do: field.name <> "[]", else: field.name end)
    |> assign_new(:value, fn -> field.value end)
    |> input()
  end

  def input(%{type: "checkbox"} = assigns) do
    assigns =
      assign_new(assigns, :checked, fn ->
        Phoenix.HTML.Form.normalize_value("checkbox", assigns[:value])
      end)

    ~H"""
    <div class="admin-fieldset">
      <label>
        <input type="hidden" name={@name} value="false" disabled={@rest[:disabled]} />
        <span class="admin-label">
          <input
            type="checkbox"
            id={@id}
            name={@name}
            value="true"
            checked={@checked}
            class={@class || "admin-checkbox admin-checkbox-sm"}
            {@rest}
          />{@label}
        </span>
      </label>
      <.error :for={msg <- @errors}>{msg}</.error>
    </div>
    """
  end

  def input(%{type: "select"} = assigns) do
    assigns = assign(assigns, :error_id, assigns.id && "#{assigns.id}-error")

    ~H"""
    <div class="admin-fieldset">
      <label>
        <span :if={@label} class="admin-label">{@label}</span>
        <select
          id={@id}
          name={@name}
          class={[@class || "admin-select", @errors != [] && (@error_class || "admin-input-error")]}
          multiple={@multiple}
          aria-invalid={@errors != [] && "true"}
          aria-describedby={@errors != [] && @error_id}
          {@rest}
        >
          <option :if={@prompt} value="">{@prompt}</option>
          {Phoenix.HTML.Form.options_for_select(@options, @value)}
        </select>
      </label>
      <.error :for={msg <- @errors} id={@error_id}>{msg}</.error>
    </div>
    """
  end

  def input(%{type: "textarea"} = assigns) do
    assigns = assign(assigns, :error_id, assigns.id && "#{assigns.id}-error")

    ~H"""
    <div class="admin-fieldset">
      <label>
        <span :if={@label} class="admin-label">{@label}</span>
        <textarea
          id={@id}
          name={@name}
          class={[
            @class || "admin-textarea",
            @errors != [] && (@error_class || "admin-input-error")
          ]}
          aria-invalid={@errors != [] && "true"}
          aria-describedby={@errors != [] && @error_id}
          {@rest}
        >{Phoenix.HTML.Form.normalize_value("textarea", @value)}</textarea>
      </label>
      <.error :for={msg <- @errors} id={@error_id}>{msg}</.error>
    </div>
    """
  end

  # All other inputs text, datetime-local, url, password, etc. are handled here...
  def input(assigns) do
    assigns = assign(assigns, :error_id, assigns.id && "#{assigns.id}-error")

    ~H"""
    <div class="admin-fieldset">
      <label>
        <span :if={@label} class="admin-label">{@label}</span>
        <input
          type={@type}
          name={@name}
          id={@id}
          value={Phoenix.HTML.Form.normalize_value(@type, @value)}
          class={[
            @class || "admin-input",
            @errors != [] && (@error_class || "admin-input-error")
          ]}
          aria-invalid={@errors != [] && "true"}
          aria-describedby={@errors != [] && @error_id}
          {@rest}
        />
      </label>
      <.error :for={msg <- @errors} id={@error_id}>{msg}</.error>
    </div>
    """
  end

  # Helper used by inputs to generate form errors
  attr :id, :string, default: nil
  slot :inner_block, required: true

  defp error(assigns) do
    ~H"""
    <p class="admin-error" id={@id} role="alert">
      <.icon name="hero-exclamation-circle" class="admin-error-icon" />
      {render_slot(@inner_block)}
    </p>
    """
  end

  @doc """
  Renders a header with title.
  """
  slot :inner_block, required: true
  slot :subtitle
  slot :actions

  def header(assigns) do
    ~H"""
    <header class={[
      "admin-header",
      @actions != [] && "admin-header-with-actions"
    ]}>
      <div>
        <h1 class="admin-header-title">
          {render_slot(@inner_block)}
        </h1>
        <p :if={@subtitle != []} class="admin-header-subtitle">
          {render_slot(@subtitle)}
        </p>
      </div>
      <div class="admin-header-actions">{render_slot(@actions)}</div>
    </header>
    """
  end

  @doc """
  Renders a table with generic styling.

  ## Examples

      <.table id="users" rows={@users}>
        <:col :let={user} label="id">{user.id}</:col>
        <:col :let={user} label="username">{user.username}</:col>
      </.table>
  """
  attr :id, :string, required: true
  attr :rows, :list, required: true
  attr :row_id, :any, default: nil, doc: "the function for generating the row id"
  attr :row_click, :any, default: nil, doc: "the function for handling phx-click on each row"

  attr :row_item, :any,
    default: &Function.identity/1,
    doc: "the function for mapping each row before calling the :col and :action slots"

  slot :col, required: true do
    attr :label, :string
  end

  slot :action, doc: "the slot for showing user actions in the last table column"

  def table(assigns) do
    assigns =
      with %{rows: %Phoenix.LiveView.LiveStream{}} <- assigns do
        assign(assigns, row_id: assigns.row_id || fn {id, _item} -> id end)
      end

    ~H"""
    <div class="admin-table-wrap">
      <table class="admin-table admin-table-zebra">
        <thead>
          <tr>
            <th :for={col <- @col}>{col[:label]}</th>
            <th :if={@action != []}>
              <span class="sr-only">{gettext("Actions")}</span>
            </th>
          </tr>
        </thead>
        <tbody id={@id} phx-update={is_struct(@rows, Phoenix.LiveView.LiveStream) && "stream"}>
          <tr :for={row <- @rows} id={@row_id && @row_id.(row)}>
            <td
              :for={col <- @col}
              phx-click={@row_click && @row_click.(row)}
              class={@row_click && "admin-table-row-clickable"}
            >
              {render_slot(col, @row_item.(row))}
            </td>
            <td :if={@action != []} class="admin-table-actions">
              <div class="admin-table-actions-row">
                <%= for action <- @action do %>
                  {render_slot(action, @row_item.(row))}
                <% end %>
              </div>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    """
  end

  @doc """
  Renders a data list.

  ## Examples

      <.list>
        <:item title="Title">{@post.title}</:item>
        <:item title="Views">{@post.views}</:item>
      </.list>
  """
  slot :item, required: true do
    attr :title, :string, required: true
  end

  def list(assigns) do
    ~H"""
    <ul class="admin-list">
      <li :for={item <- @item} class="admin-list-row">
        <div class="admin-list-grow">
          <div class="admin-list-title">{item.title}</div>
          <div>{render_slot(item)}</div>
        </div>
      </li>
    </ul>
    """
  end

  @doc """
  Renders a [Heroicon](https://heroicons.com).

  Heroicons come in three styles – outline, solid, and mini.
  By default, the outline style is used, but solid and mini may
  be applied by using the `-solid` and `-mini` suffix.

  You can customize the size and colors of the icons by setting
  width, height, and background color classes.

  Icons are extracted from the `deps/heroicons` directory and bundled into
  `admin/icons.css` by `mix generate_admin_icons`.

  ## Examples

      <.icon name="hero-x-mark" />
      <.icon name="hero-arrow-path" class="ml-1 size-3 motion-safe:animate-spin" />
  """
  attr :name, :string, required: true
  attr :class, :string, default: "size-4"

  def icon(%{name: "hero-" <> _} = assigns) do
    ~H"""
    <span class={[@name, @class]} />
    """
  end

  @doc """
  Renders a link to an external site with proper security attributes,
  an external-link icon, and screen reader context.

  Set `icon={false}` when the link already contains its own visual indicator.
  """
  attr :href, :string, required: true
  attr :class, :string, default: nil
  attr :icon, :boolean, default: true
  attr :rest, :global
  slot :inner_block, required: true

  def external_link(assigns) do
    ~H"""
    <a href={@href} target="_blank" rel="noopener noreferrer" class={@class} {@rest}>
      {render_slot(@inner_block)}
      <.icon :if={@icon} name="hero-arrow-top-right-on-square" class="external-link-icon" />
      <span class="sr-only">(opens in new tab)</span>
    </a>
    """
  end

  ## JS Commands

  def show(js \\ %JS{}, selector) do
    JS.show(js,
      to: selector,
      time: 300,
      transition:
        {"transition-all ease-out duration-300",
         "opacity-0 translate-y-4 sm:translate-y-0 sm:scale-95",
         "opacity-100 translate-y-0 sm:scale-100"}
    )
  end

  def hide(js \\ %JS{}, selector) do
    JS.hide(js,
      to: selector,
      time: 200,
      transition:
        {"transition-all ease-in duration-200", "opacity-100 translate-y-0 sm:scale-100",
         "opacity-0 translate-y-4 sm:translate-y-0 sm:scale-95"}
    )
  end

  @doc """
  Translates an error message using gettext.
  """
  def translate_error({msg, opts}) do
    # When using gettext, we typically pass the strings we want
    # to translate as a static argument:
    #
    #     # Translate the number of files with plural rules
    #     dngettext("errors", "1 file", "%{count} files", count)
    #
    # However the error messages in our forms and APIs are generated
    # dynamically, so we need to translate them by calling Gettext
    # with our gettext backend as first argument. Translations are
    # available in the errors.po file (as we use the "errors" domain).
    if count = opts[:count] do
      Gettext.dngettext(BerrypodWeb.Gettext, "errors", msg, msg, count, opts)
    else
      Gettext.dgettext(BerrypodWeb.Gettext, "errors", msg, opts)
    end
  end

  @doc """
  Translates the errors for a field from a keyword list of errors.
  """
  def translate_errors(errors, field) when is_list(errors) do
    for {^field, {msg, opts}} <- errors, do: translate_error({msg, opts})
  end

  @doc """
  Renders a modal dialog.

  Uses daisyUI's modal component with proper accessibility.

  ## Examples

      <.modal id="confirm-modal">
        Are you sure?
        <:actions>
          <button class="btn">Cancel</button>
          <button class="btn btn-primary">Confirm</button>
        </:actions>
      </.modal>

  """
  attr :id, :string, required: true
  attr :show, :boolean, default: false
  attr :on_cancel, JS, default: %JS{}

  slot :inner_block, required: true
  slot :actions

  def modal(assigns) do
    ~H"""
    <dialog
      id={@id}
      class="admin-modal"
      phx-mounted={@show && show_modal(@id)}
      phx-remove={hide_modal(@id)}
    >
      <div class="admin-modal-box">
        <form method="dialog" class="admin-modal-close">
          <button
            class="admin-btn admin-btn-ghost admin-btn-icon-round admin-btn-sm"
            phx-click={@on_cancel}
            aria-label={gettext("close")}
          >
            <.icon name="hero-x-mark" class="size-5" />
          </button>
        </form>
        {render_slot(@inner_block)}
        <div :if={@actions != []} class="admin-modal-actions">
          {render_slot(@actions)}
        </div>
      </div>
    </dialog>
    """
  end

  @doc """
  Renders a radio card group — a set of selectable cards backed by radio inputs.

  Each option is a map with `:value` and `:name`, plus optional `:description`,
  `:tags`, `:url`, `:badge`, and `:disabled` keys.

  The `display` attr controls card content layout:
  - `:tags` (default) — name + tag pills + short description
  - `:description` — name + description text + link

  ## Examples

      <.card_radio_group
        name="email[adapter]"
        value={@selected}
        legend="Email provider"
        options={[
          %{value: "postmark", name: "Postmark", description: "Fast email.", tags: ["Transactional", "US"]},
          %{value: "smtp", name: "SMTP", description: "Any SMTP server.", tags: ["Any type"]}
        ]}
      />
  """
  attr :name, :string, required: true
  attr :value, :string, default: nil
  attr :legend, :string, required: true
  attr :options, :list, required: true
  attr :disabled, :boolean, default: false
  attr :display, :atom, default: :tags, values: [:description, :tags]

  def card_radio_group(assigns) do
    ~H"""
    <fieldset class="card-radio-fieldset" disabled={@disabled}>
      <legend class="admin-label">{@legend}</legend>
      <div class="card-radio-grid">
        <label
          :for={option <- @options}
          class={[
            "card-radio-card",
            @value == option.value && "card-radio-card-selected",
            option[:disabled] && "card-radio-card-disabled"
          ]}
        >
          <input
            type="radio"
            id={"#{@name}-#{option.value}"}
            name={@name}
            value={option.value}
            checked={@value == option.value}
            disabled={option[:disabled] || @disabled}
            class="card-radio-input"
          />
          <span class="card-radio-name">{option.name}</span>
          <.card_radio_content option={option} display={@display} />
        </label>
      </div>
    </fieldset>
    """
  end

  attr :option, :map, required: true
  attr :display, :atom, required: true

  defp card_radio_content(%{display: :tags} = assigns) do
    ~H"""
    <span :if={@option[:tags]} class="card-radio-tags">
      <span :for={tag <- @option.tags} class="card-radio-tag">{tag}</span>
    </span>
    <span :if={@option[:description]} class="card-radio-description">
      {@option.description}
    </span>
    <span :if={@option[:badge]} class="card-radio-badge">{@option.badge}</span>
    """
  end

  defp card_radio_content(assigns) do
    ~H"""
    <span :if={@option[:description]} class="card-radio-description">
      {@option.description}
    </span>
    <span :if={@option[:badge]} class="card-radio-badge">{@option.badge}</span>
    <.external_link
      :if={@option[:url]}
      href={@option.url}
      icon={false}
      class="card-radio-link"
      onclick="event.stopPropagation();"
      aria-label={@option.name}
    >
      {@option.name} &nearr;
    </.external_link>
    """
  end

  def show_modal(js \\ %JS{}, id) when is_binary(id) do
    js
    |> JS.exec("showModal()", to: "##{id}")
  end

  def hide_modal(js \\ %JS{}, id) when is_binary(id) do
    js
    |> JS.exec("close()", to: "##{id}")
    |> JS.pop_focus()
  end

  # ── Pagination ───────────────────────────────────────────────────

  @doc """
  Renders pagination controls for admin lists.

  Hidden when there's only one page. Shows "Showing X-Y of Z" on the left,
  page number buttons with ellipsis on the right.

  ## Attributes

    * `page` - Required. A `%Berrypod.Pagination{}` struct.
    * `patch` - Required. Base URL path for pagination links (e.g. "/admin/products").
    * `params` - Extra query params to preserve (e.g. %{"tab" => "broken"}). Default `%{}`.
  """
  attr :page, Berrypod.Pagination, required: true
  attr :patch, :string, required: true
  attr :params, :map, default: %{}

  def admin_pagination(assigns) do
    assigns =
      assigns
      |> assign(:showing, Berrypod.Pagination.showing_text(assigns.page))
      |> assign(:numbers, Berrypod.Pagination.page_numbers(assigns.page))

    ~H"""
    <nav
      :if={@page.total_pages > 1}
      aria-label="Pagination"
      class="admin-pagination"
    >
      <p class="admin-pagination-showing">{@showing}</p>

      <div class="admin-pagination-buttons">
        <.link
          patch={admin_page_url(@patch, @page.page - 1, @params)}
          class={["admin-btn admin-btn-sm admin-btn-ghost", @page.page == 1 && "admin-btn-disabled"]}
          aria-label="Previous page"
          aria-disabled={@page.page == 1 && "true"}
          tabindex={@page.page == 1 && "-1"}
        >
          <.icon name="hero-chevron-left" class="size-4" />
        </.link>

        <%= for item <- @numbers do %>
          <%= case item do %>
            <% :ellipsis -> %>
              <span class="admin-pagination-ellipsis" aria-hidden="true">&hellip;</span>
            <% n -> %>
              <.link
                patch={admin_page_url(@patch, n, @params)}
                aria-label={"Page #{n}"}
                aria-current={n == @page.page && "page"}
                class={[
                  "admin-btn admin-btn-sm",
                  if(n == @page.page, do: "admin-btn-primary", else: "admin-btn-ghost")
                ]}
              >
                {n}
              </.link>
          <% end %>
        <% end %>

        <.link
          patch={admin_page_url(@patch, @page.page + 1, @params)}
          class={[
            "admin-btn admin-btn-sm admin-btn-ghost",
            @page.page == @page.total_pages && "admin-btn-disabled"
          ]}
          aria-label="Next page"
          aria-disabled={@page.page == @page.total_pages && "true"}
          tabindex={@page.page == @page.total_pages && "-1"}
        >
          <.icon name="hero-chevron-right" class="size-4" />
        </.link>
      </div>
    </nav>
    """
  end

  defp admin_page_url(base, page, params) do
    query = if page > 1, do: Map.put(params, "page", to_string(page)), else: params
    if query == %{}, do: base, else: base <> "?" <> URI.encode_query(query)
  end
end