defmodule PhoenixKit.Modules.Billing.Web.UserBillingProfileForm do
  @moduledoc """
  User billing profile form LiveView for creating and editing own billing profiles.
  """

  use PhoenixKitWeb, :live_view

  alias PhoenixKit.Modules.Billing
  alias PhoenixKit.Modules.Billing.BillingProfile
  alias PhoenixKit.Modules.Billing.CountryData
  alias PhoenixKit.Utils.Routes

  @impl true
  def mount(params, _session, socket) do
    user = get_current_user(socket)

    cond do
      not Billing.enabled?() ->
        {:ok,
         socket
         |> put_flash(:error, "Billing module is not enabled")
         |> push_navigate(to: Routes.path("/dashboard"))}

      is_nil(user) ->
        {:ok,
         socket
         |> put_flash(:error, "Please log in to manage billing profiles")
         |> push_navigate(to: Routes.path("/phoenix_kit/users/log-in"))}

      true ->
        countries = CountryData.countries_for_select()
        return_to = params["return_to"]

        socket =
          socket
          |> assign(:user, user)
          |> assign(:countries, countries)
          |> assign(:profile_type, "individual")
          |> assign(:subdivision_label, "Region")
          |> assign(:return_to, return_to)
          |> load_profile(params["id"])

        {:ok, socket}
    end
  end

  defp load_profile(socket, nil) do
    # New profile
    changeset = Billing.change_billing_profile(%BillingProfile{type: "individual"})

    socket
    |> assign(:page_title, "New Billing Profile")
    |> assign(:profile, nil)
    |> assign(:form, to_form(changeset))
  end

  defp load_profile(socket, id) do
    case Billing.get_billing_profile(id) do
      nil ->
        socket
        |> put_flash(:error, "Billing profile not found")
        |> push_navigate(to: Routes.path("/dashboard/billing-profiles"))

      profile ->
        # Verify ownership
        if profile.user_id != socket.assigns.user.id do
          socket
          |> put_flash(:error, "Access denied")
          |> push_navigate(to: Routes.path("/dashboard/billing-profiles"))
        else
          changeset = Billing.change_billing_profile(profile)

          socket
          |> assign(:page_title, "Edit Billing Profile")
          |> assign(:profile, profile)
          |> assign(:form, to_form(changeset))
          |> assign(:profile_type, profile.type)
          |> assign(:subdivision_label, CountryData.get_subdivision_label(profile.country))
        end
    end
  end

  @impl true
  def handle_event("change_type", %{"type" => type}, socket) do
    {:noreply, assign(socket, :profile_type, type)}
  end

  @impl true
  def handle_event("validate", %{"billing_profile" => params}, socket) do
    changeset =
      (socket.assigns.profile || %BillingProfile{})
      |> Billing.change_billing_profile(params)
      |> Map.put(:action, :validate)

    # Update subdivision label when country changes
    subdivision_label = CountryData.get_subdivision_label(params["country"])

    {:noreply,
     socket
     |> assign(:form, to_form(changeset))
     |> assign(:subdivision_label, subdivision_label)}
  end

  @impl true
  def handle_event("save", %{"billing_profile" => params}, socket) do
    params =
      params
      |> Map.put("user_id", socket.assigns.user.id)
      |> Map.put("type", socket.assigns.profile_type)

    save_profile(socket, params)
  end

  defp save_profile(socket, params) do
    result =
      if socket.assigns.profile do
        Billing.update_billing_profile(socket.assigns.profile, params)
      else
        Billing.create_billing_profile(socket.assigns.user.id, params)
      end

    case result do
      {:ok, _profile} ->
        action = if socket.assigns.profile, do: "updated", else: "created"
        redirect_path = socket.assigns.return_to || Routes.path("/dashboard/billing-profiles")

        {:noreply,
         socket
         |> put_flash(:info, "Billing profile #{action} successfully")
         |> push_navigate(to: redirect_path)}

      {:error, changeset} ->
        {:noreply, assign(socket, :form, to_form(changeset))}
    end
  end

  @impl true
  def render(assigns) do
    ~H"""
    <PhoenixKitWeb.Layouts.dashboard {dashboard_assigns(assigns)}>
      <div class="p-6 max-w-3xl mx-auto">
        <%!-- Header --%>
        <div class="flex items-center gap-4 mb-8">
          <.link
            navigate={@return_to || Routes.path("/dashboard/billing-profiles")}
            class="btn btn-ghost btn-sm"
          >
            <.icon name="hero-arrow-left" class="w-5 h-5" />
          </.link>
          <div>
            <h1 class="text-2xl font-bold">{@page_title}</h1>
            <p class="text-base-content/60 text-sm">
              <%= if @profile do %>
                Update your billing information
              <% else %>
                Create a new billing profile for orders
              <% end %>
            </p>
          </div>
        </div>

        <form phx-change="validate" phx-submit="save" class="space-y-6">
          <%!-- Profile Type Selection --%>
          <div class="card bg-base-100 shadow-lg">
            <div class="card-body">
              <h2 class="card-title text-lg">
                <.icon name="hero-user-circle" class="w-5 h-5" /> Profile Type
              </h2>

              <div class="flex gap-4 mt-2">
                <label class="flex items-center gap-2 cursor-pointer">
                  <input
                    type="radio"
                    name="profile_type"
                    value="individual"
                    class="radio radio-primary"
                    checked={@profile_type == "individual"}
                    phx-click="change_type"
                    phx-value-type="individual"
                  />
                  <span class="label-text">Individual</span>
                </label>
                <label class="flex items-center gap-2 cursor-pointer">
                  <input
                    type="radio"
                    name="profile_type"
                    value="company"
                    class="radio radio-primary"
                    checked={@profile_type == "company"}
                    phx-click="change_type"
                    phx-value-type="company"
                  />
                  <span class="label-text">Company</span>
                </label>
              </div>
            </div>
          </div>

          <%!-- Individual Fields --%>
          <%= if @profile_type == "individual" do %>
            <div class="card bg-base-100 shadow-lg">
              <div class="card-body">
                <h2 class="card-title text-lg">
                  <.icon name="hero-user" class="w-5 h-5" /> Personal Information
                </h2>

                <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">First Name *</span>
                    </label>
                    <input
                      type="text"
                      name="billing_profile[first_name]"
                      value={@form[:first_name].value}
                      class="input input-bordered"
                      placeholder="John"
                    />
                    <.error :for={msg <- @form[:first_name].errors |> Enum.map(&elem(&1, 0))}>
                      {msg}
                    </.error>
                  </div>

                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">Last Name *</span>
                    </label>
                    <input
                      type="text"
                      name="billing_profile[last_name]"
                      value={@form[:last_name].value}
                      class="input input-bordered"
                      placeholder="Doe"
                    />
                    <.error :for={msg <- @form[:last_name].errors |> Enum.map(&elem(&1, 0))}>
                      {msg}
                    </.error>
                  </div>
                </div>

                <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mt-4">
                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">Email</span>
                    </label>
                    <input
                      type="email"
                      name="billing_profile[email]"
                      value={@form[:email].value}
                      class="input input-bordered"
                      placeholder="john@example.com"
                    />
                  </div>

                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">Phone</span>
                    </label>
                    <input
                      type="tel"
                      name="billing_profile[phone]"
                      value={@form[:phone].value}
                      class="input input-bordered"
                      placeholder="+372 5555 5555"
                    />
                  </div>
                </div>
              </div>
            </div>
          <% end %>

          <%!-- Company Fields --%>
          <%= if @profile_type == "company" do %>
            <div class="card bg-base-100 shadow-lg">
              <div class="card-body">
                <h2 class="card-title text-lg">
                  <.icon name="hero-building-office" class="w-5 h-5" /> Company Information
                </h2>

                <div class="form-control">
                  <label class="label">
                    <span class="label-text">Company Name *</span>
                  </label>
                  <input
                    type="text"
                    name="billing_profile[company_name]"
                    value={@form[:company_name].value}
                    class="input input-bordered"
                    placeholder="Acme Corp OÜ"
                  />
                  <.error :for={msg <- @form[:company_name].errors |> Enum.map(&elem(&1, 0))}>
                    {msg}
                  </.error>
                </div>

                <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mt-4">
                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">VAT Number</span>
                    </label>
                    <input
                      type="text"
                      name="billing_profile[company_vat_number]"
                      value={@form[:company_vat_number].value}
                      class="input input-bordered font-mono"
                      placeholder="EE123456789"
                    />
                    <label class="label">
                      <span class="label-text-alt">EU VAT format: Country code + number</span>
                    </label>
                  </div>

                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">Registration Number</span>
                    </label>
                    <input
                      type="text"
                      name="billing_profile[company_registration_number]"
                      value={@form[:company_registration_number].value}
                      class="input input-bordered font-mono"
                      placeholder="12345678"
                    />
                  </div>
                </div>

                <div class="form-control mt-4">
                  <label class="label">
                    <span class="label-text">Legal Address</span>
                  </label>
                  <textarea
                    name="billing_profile[company_legal_address]"
                    class="textarea textarea-bordered"
                    rows="2"
                    placeholder="Registered legal address"
                  >{@form[:company_legal_address].value}</textarea>
                </div>

                <div class="divider">Contact</div>

                <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">Contact Email</span>
                    </label>
                    <input
                      type="email"
                      name="billing_profile[email]"
                      value={@form[:email].value}
                      class="input input-bordered"
                      placeholder="billing@company.com"
                    />
                  </div>

                  <div class="form-control">
                    <label class="label">
                      <span class="label-text">Phone</span>
                    </label>
                    <input
                      type="tel"
                      name="billing_profile[phone]"
                      value={@form[:phone].value}
                      class="input input-bordered"
                      placeholder="+372 5555 5555"
                    />
                  </div>
                </div>
              </div>
            </div>
          <% end %>

          <%!-- Billing Address (Country FIRST) --%>
          <div class="card bg-base-100 shadow-lg">
            <div class="card-body">
              <h2 class="card-title text-lg">
                <.icon name="hero-map-pin" class="w-5 h-5" /> Billing Address
              </h2>

              <%!-- Country first --%>
              <div class="form-control">
                <label class="label">
                  <span class="label-text">Country *</span>
                </label>
                <select name="billing_profile[country]" class="select select-bordered">
                  <option value="">Select country...</option>
                  <%= for {name, code} <- @countries do %>
                    <option value={code} selected={@form[:country].value == code}>
                      {name}
                    </option>
                  <% end %>
                </select>
              </div>

              <div class="form-control mt-4">
                <label class="label">
                  <span class="label-text">Address Line 1</span>
                </label>
                <input
                  type="text"
                  name="billing_profile[address_line1]"
                  value={@form[:address_line1].value}
                  class="input input-bordered"
                  placeholder="Street address"
                />
              </div>

              <div class="form-control">
                <label class="label">
                  <span class="label-text">Address Line 2</span>
                </label>
                <input
                  type="text"
                  name="billing_profile[address_line2]"
                  value={@form[:address_line2].value}
                  class="input input-bordered"
                  placeholder="Apartment, suite, etc."
                />
              </div>

              <div class="grid grid-cols-1 sm:grid-cols-3 gap-4 mt-4">
                <div class="form-control">
                  <label class="label">
                    <span class="label-text">City</span>
                  </label>
                  <input
                    type="text"
                    name="billing_profile[city]"
                    value={@form[:city].value}
                    class="input input-bordered"
                    placeholder="Tallinn"
                  />
                </div>

                <div class="form-control">
                  <label class="label">
                    <span class="label-text">{@subdivision_label}</span>
                  </label>
                  <input
                    type="text"
                    name="billing_profile[state]"
                    value={@form[:state].value}
                    class="input input-bordered"
                    placeholder="Harju"
                  />
                </div>

                <div class="form-control">
                  <label class="label">
                    <span class="label-text">Postal Code</span>
                  </label>
                  <input
                    type="text"
                    name="billing_profile[postal_code]"
                    value={@form[:postal_code].value}
                    class="input input-bordered"
                    placeholder="10115"
                  />
                </div>
              </div>
            </div>
          </div>

          <%!-- Options --%>
          <div class="card bg-base-100 shadow-lg">
            <div class="card-body">
              <h2 class="card-title text-lg">
                <.icon name="hero-cog-6-tooth" class="w-5 h-5" /> Options
              </h2>

              <div class="form-control">
                <label class="cursor-pointer label justify-start gap-4">
                  <input
                    type="checkbox"
                    name="billing_profile[is_default]"
                    value="true"
                    class="checkbox checkbox-primary"
                    checked={@form[:is_default].value == true || @form[:is_default].value == "true"}
                  />
                  <div>
                    <span class="label-text font-medium">Set as default profile</span>
                    <span class="label-text-alt block">
                      This profile will be used by default for new orders
                    </span>
                  </div>
                </label>
              </div>

              <div class="form-control mt-4">
                <label class="label">
                  <span class="label-text">Profile Name (Optional)</span>
                </label>
                <input
                  type="text"
                  name="billing_profile[name]"
                  value={@form[:name].value}
                  class="input input-bordered"
                  placeholder="e.g., Home Address, Work"
                />
                <label class="label">
                  <span class="label-text-alt">Custom name to identify this profile</span>
                </label>
              </div>
            </div>
          </div>

          <%!-- Actions --%>
          <div class="flex justify-end gap-4">
            <.link
              navigate={@return_to || Routes.path("/dashboard/billing-profiles")}
              class="btn btn-ghost"
            >
              Cancel
            </.link>
            <button type="submit" class="btn btn-primary">
              <.icon name="hero-check" class="w-5 h-5 mr-2" />
              {if @profile, do: "Save Changes", else: "Create Profile"}
            </button>
          </div>
        </form>
      </div>
    </PhoenixKitWeb.Layouts.dashboard>
    """
  end

  # Private helpers

  defp get_current_user(socket) do
    case socket.assigns[:phoenix_kit_current_scope] do
      %{user: %{id: _} = user} -> user
      _ -> nil
    end
  end
end