defmodule ToweropsWeb.CheckLive.FormComponent do
  @moduledoc false
  use ToweropsWeb, :live_component

  alias Towerops.Agents
  alias Towerops.Monitoring

  @impl true
  def render(assigns) do
    ~H"""
    <div class="relative z-50">
      <div class="fixed inset-0 bg-gray-500 dark:bg-gray-900 bg-opacity-75 dark:bg-opacity-80 transition-opacity">
      </div>

      <div class="fixed inset-0 z-10 overflow-y-auto">
        <div class="flex min-h-full items-end justify-center p-4 text-center sm:items-center sm:p-0">
          <div class="relative transform overflow-hidden rounded-lg bg-white dark:bg-gray-800 text-left shadow-xl transition-all sm:my-8 sm:w-full sm:max-w-lg">
            <.form
              for={@form}
              id="check-form"
              phx-target={@myself}
              phx-change="validate"
              phx-submit="save"
            >
              <div class="bg-white dark:bg-gray-800 px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
                <div class="flex items-start justify-between mb-4">
                  <h3 class="text-lg font-semibold text-gray-900 dark:text-white">
                    {if @action == :edit, do: "Edit Service Check", else: "Add Service Check"}
                  </h3>
                  <button
                    type="button"
                    phx-click="close"
                    phx-target={@myself}
                    class="text-gray-400 hover:text-gray-500 dark:hover:text-gray-300"
                  >
                    <.icon name="hero-x-mark" class="h-6 w-6" />
                  </button>
                </div>

                <div class="space-y-4">
                  <!-- Check Type Selection -->
                  <div>
                    <label class="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1">
                      Check Type
                    </label>
                    <.input
                      field={@form[:check_type]}
                      type="select"
                      options={[
                        {"HTTP/HTTPS Check", "http"},
                        {"TCP Port Check", "tcp"},
                        {"DNS Check", "dns"},
                        {"SSL Certificate Check", "ssl"}
                      ]}
                      phx-change="change_type"
                      phx-target={@myself}
                      disabled={@action == :edit}
                    />
                  </div>
                  
    <!-- Check Name -->
                  <div>
                    <.input
                      field={@form[:name]}
                      type="text"
                      label="Check Name"
                      placeholder="e.g., Web Server Check"
                    />
                  </div>
                  
    <!-- Dynamic fields based on check type -->
                  <%= case @selected_type do %>
                    <% "http" -> %>
                      {render_http_fields(assigns)}
                    <% "tcp" -> %>
                      {render_tcp_fields(assigns)}
                    <% "dns" -> %>
                      {render_dns_fields(assigns)}
                    <% "ssl" -> %>
                      {render_ssl_fields(assigns)}
                    <% _ -> %>
                      <div class="text-sm text-gray-500 dark:text-gray-400">
                        Select a check type to configure
                      </div>
                  <% end %>
                  
    <!-- Common Settings -->
                  <div class="grid grid-cols-2 gap-4">
                    <div>
                      <.input
                        field={@form[:interval_seconds]}
                        type="number"
                        label="Interval (seconds)"
                      />
                    </div>
                    <div>
                      <.input field={@form[:timeout_ms]} type="number" label="Timeout (ms)" />
                    </div>
                  </div>
                </div>
              </div>

              <div class="bg-gray-50 dark:bg-gray-900/50 px-4 py-3 sm:flex sm:flex-row-reverse sm:px-6 gap-3">
                <.button
                  type="submit"
                  phx-disable-with={if @action == :edit, do: "Saving...", else: "Creating..."}
                >
                  {if @action == :edit, do: "Save Changes", else: "Create Check"}
                </.button>
                <button
                  type="button"
                  phx-click="close"
                  phx-target={@myself}
                  class="text-sm font-semibold text-gray-700 dark:text-gray-300 hover:text-gray-900 dark:hover:text-white"
                >
                  Cancel
                </button>
              </div>
            </.form>
          </div>
        </div>
      </div>
    </div>
    """
  end

  defp render_http_fields(assigns) do
    ~H"""
    <div class="space-y-4">
      <div>
        <.input field={@form[:url]} type="text" label="URL" placeholder="https://example.com/health" />
      </div>

      <div class="grid grid-cols-2 gap-4">
        <div>
          <.input
            field={@form[:method]}
            type="select"
            label="Method"
            options={["GET", "POST", "PUT", "DELETE", "HEAD"]}
          />
        </div>
        <div>
          <.input
            field={@form[:expected_status]}
            type="number"
            label="Expected Status"
            placeholder="200"
          />
        </div>
      </div>

      <div class="flex items-center gap-6">
        <.input field={@form[:verify_ssl]} type="checkbox" label="Verify SSL Certificate" />
        <.input field={@form[:follow_redirects]} type="checkbox" label="Follow Redirects" />
      </div>

      <details class="border border-gray-200 dark:border-gray-700 rounded-lg p-3">
        <summary class="cursor-pointer text-sm font-medium text-gray-700 dark:text-gray-300">
          Advanced Options
        </summary>
        <div class="mt-3 space-y-3">
          <div>
            <.input
              field={@form[:content_match]}
              type="text"
              label="Content Match (regex)"
              placeholder="Optional regex pattern"
            />
          </div>
        </div>
      </details>
    </div>
    """
  end

  defp render_tcp_fields(assigns) do
    ~H"""
    <div class="space-y-4">
      <div class="grid grid-cols-2 gap-4">
        <div>
          <.input field={@form[:host]} type="text" label="Host" placeholder="example.com" />
        </div>
        <div>
          <.input field={@form[:port]} type="number" label="Port" placeholder="80" />
        </div>
      </div>

      <div>
        <.input
          field={@form[:send_string]}
          type="text"
          label="Send String (optional)"
          placeholder="Text to send after connecting"
        />
      </div>

      <div>
        <.input
          field={@form[:expect_string]}
          type="text"
          label="Expect String (optional)"
          placeholder="Expected response pattern"
        />
      </div>
    </div>
    """
  end

  defp render_dns_fields(assigns) do
    ~H"""
    <div class="space-y-4">
      <div>
        <.input field={@form[:hostname]} type="text" label="Hostname" placeholder="example.com" />
      </div>

      <div class="grid grid-cols-2 gap-4">
        <div>
          <.input
            field={@form[:record_type]}
            type="select"
            label="Record Type"
            options={["A", "AAAA", "CNAME", "MX", "TXT", "NS"]}
          />
        </div>
        <div>
          <.input
            field={@form[:dns_server]}
            type="text"
            label="DNS Server (optional)"
            placeholder="8.8.8.8"
          />
        </div>
      </div>

      <div>
        <.input
          field={@form[:expected_result]}
          type="text"
          label="Expected Result (optional)"
          placeholder="Expected IP or value"
        />
      </div>
    </div>
    """
  end

  defp render_ssl_fields(assigns) do
    ~H"""
    <div class="space-y-4">
      <div class="grid grid-cols-2 gap-4">
        <div>
          <.input field={@form[:host]} type="text" label="Host" placeholder="example.com" />
        </div>
        <div>
          <.input field={@form[:port]} type="number" label="Port" placeholder="443" />
        </div>
      </div>

      <div>
        <.input
          field={@form[:warning_days]}
          type="number"
          label="Warning Days"
          placeholder="30"
        />
        <p class="mt-1 text-xs text-gray-500 dark:text-gray-400">
          Alert when certificate expires within this many days
        </p>
      </div>
    </div>
    """
  end

  @impl true
  def mount(socket) do
    {:ok, socket}
  end

  @impl true
  def update(assigns, socket) do
    action = assigns[:action] || :new
    check = assigns[:check]

    {selected_type, changeset} =
      if action == :edit && check do
        # Editing: populate from existing check
        type = check.check_type
        config = check.config || %{}

        form_attrs =
          config
          |> config_to_form_fields(type)
          |> Map.merge(%{
            "name" => check.name,
            "check_type" => type,
            "interval_seconds" => check.interval_seconds,
            "timeout_ms" => check.timeout_ms
          })

        {type, Monitoring.change_check(check, form_attrs)}
      else
        # Creating: start with defaults
        {"http", Monitoring.change_check(%Monitoring.Check{})}
      end

    {:ok,
     socket
     |> assign(assigns)
     |> assign(:action, action)
     |> assign(:selected_type, selected_type)
     |> assign(:form, to_form(changeset))
     |> assign_default_config(selected_type)}
  end

  @impl true
  def handle_event("change_type", %{"check" => %{"check_type" => type}}, socket) do
    socket =
      socket
      |> assign(:selected_type, type)
      |> assign_default_config(type)

    # Auto-fill host from device IP for TCP and SSL checks
    socket =
      if type in ["tcp", "ssl"] && socket.assigns[:device] do
        device = socket.assigns.device

        if device.ip_address && device.ip_address != "" do
          ip_str = to_string(device.ip_address)
          form = socket.assigns.form
          params = form.params || %{}
          params = Map.put(params, "host", ip_str)
          changeset = Monitoring.change_check(%Monitoring.Check{}, params)
          assign(socket, :form, to_form(changeset))
        else
          socket
        end
      else
        socket
      end

    {:noreply, socket}
  end

  @impl true
  def handle_event("validate", %{"check" => check_params}, socket) do
    check_params = merge_config_params(check_params, socket.assigns.selected_type)

    check =
      if socket.assigns.action == :edit,
        do: socket.assigns.check,
        else: %Monitoring.Check{}

    changeset =
      check
      |> Monitoring.change_check(check_params)
      |> Map.put(:action, :validate)

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

  @impl true
  def handle_event("save", %{"check" => check_params}, socket) do
    check_params = merge_config_params(check_params, socket.assigns.selected_type)

    if socket.assigns.action == :edit do
      save_edit(socket, check_params)
    else
      save_new(socket, check_params)
    end
  end

  @impl true
  def handle_event("close", _params, socket) do
    notify_parent(:close)
    {:noreply, socket}
  end

  defp save_new(socket, check_params) do
    device = socket.assigns.device
    effective_agent_token_id = Agents.get_effective_agent_token(device)

    check_params =
      check_params
      |> Map.put("organization_id", device.organization_id)
      |> Map.put("device_id", device.id)
      |> Map.put("source_type", "manual")
      |> Map.put("agent_token_id", effective_agent_token_id)

    case Monitoring.create_check(check_params) do
      {:ok, check} ->
        _ = Monitoring.schedule_check(check)
        notify_parent({:check_created, check})
        {:noreply, socket}

      {:error, %Ecto.Changeset{} = changeset} ->
        {:noreply, assign(socket, form: to_form(changeset))}
    end
  end

  defp save_edit(socket, check_params) do
    check = socket.assigns.check

    case Monitoring.update_check(check, check_params) do
      {:ok, updated_check} ->
        notify_parent({:check_updated, updated_check})
        {:noreply, socket}

      {:error, %Ecto.Changeset{} = changeset} ->
        {:noreply, assign(socket, form: to_form(changeset))}
    end
  end

  @doc false
  def config_to_form_fields(config, "http") do
    %{
      "url" => config["url"] || "",
      "method" => config["method"] || "GET",
      "expected_status" => to_string(config["expected_status"] || 200),
      "verify_ssl" => to_string(config["verify_ssl"] != false),
      "follow_redirects" => to_string(config["follow_redirects"] != false),
      "content_match" => config["regex"] || ""
    }
  end

  def config_to_form_fields(config, "tcp") do
    %{
      "host" => config["host"] || "",
      "port" => to_string(config["port"] || ""),
      "send_string" => config["send"] || "",
      "expect_string" => config["expect"] || ""
    }
  end

  def config_to_form_fields(config, "dns") do
    %{
      "hostname" => config["hostname"] || "",
      "record_type" => config["record_type"] || "A",
      "dns_server" => config["server"] || "",
      "expected_result" => config["expected"] || ""
    }
  end

  def config_to_form_fields(config, "ssl") do
    %{
      "host" => config["host"] || "",
      "port" => to_string(config["port"] || 443),
      "warning_days" => to_string(config["warning_days"] || 30)
    }
  end

  def config_to_form_fields(_config, _type), do: %{}

  defp assign_default_config(socket, type) do
    assign(socket, :default_config, default_config_for_type(socket, type))
  end

  defp default_config_for_type(_socket, "http"), do: default_config_by_type("http", "")

  defp default_config_for_type(socket, "tcp"), do: default_config_by_type("tcp", device_host_from_socket(socket))

  defp default_config_for_type(_socket, "dns"), do: default_config_by_type("dns", "")

  defp default_config_for_type(socket, "ssl"), do: default_config_by_type("ssl", device_host_from_socket(socket))

  defp default_config_for_type(_socket, _type), do: %{}

  @doc false
  def default_config_by_type("http", _host) do
    %{
      "url" => "",
      "method" => "GET",
      "expected_status" => "200",
      "verify_ssl" => "true",
      "follow_redirects" => "true"
    }
  end

  def default_config_by_type("tcp", host), do: %{"host" => host, "port" => ""}
  def default_config_by_type("dns", _host), do: %{"hostname" => "", "record_type" => "A"}

  def default_config_by_type("ssl", host), do: %{"host" => host, "port" => "443", "warning_days" => "30"}

  def default_config_by_type(_type, _host), do: %{}

  @doc false
  def device_host(nil), do: ""
  def device_host(%{ip_address: nil}), do: ""
  def device_host(%{ip_address: ip}), do: to_string(ip)
  def device_host(_), do: ""

  defp device_host_from_socket(socket) do
    device_host(socket.assigns[:device])
  end

  @doc false
  def merge_config_params(check_params, type) do
    check_params
    |> Map.put("config", config_from_params(check_params, type))
    |> Map.put("check_type", type)
  end

  def config_from_params(check_params, "http") do
    maybe_add(
      %{
        "url" => check_params["url"],
        "method" => check_params["method"] || "GET",
        "expected_status" => String.to_integer(check_params["expected_status"] || "200"),
        "verify_ssl" => check_params["verify_ssl"] == "true",
        "follow_redirects" => check_params["follow_redirects"] == "true"
      },
      "regex",
      check_params["content_match"]
    )
  end

  def config_from_params(check_params, "tcp") do
    %{
      "host" => check_params["host"],
      "port" => String.to_integer(check_params["port"] || "0")
    }
    |> maybe_add("send", check_params["send_string"])
    |> maybe_add("expect", check_params["expect_string"])
  end

  def config_from_params(check_params, "dns") do
    %{
      "hostname" => check_params["hostname"],
      "record_type" => check_params["record_type"] || "A"
    }
    |> maybe_add("server", check_params["dns_server"])
    |> maybe_add("expected", check_params["expected_result"])
  end

  def config_from_params(check_params, "ssl") do
    %{
      "host" => check_params["host"],
      "port" => String.to_integer(check_params["port"] || "443"),
      "warning_days" => String.to_integer(check_params["warning_days"] || "30")
    }
  end

  def config_from_params(_check_params, _type), do: %{}

  defp maybe_add(map, _key, nil), do: map
  defp maybe_add(map, _key, ""), do: map
  defp maybe_add(map, key, value), do: Map.put(map, key, value)

  defp notify_parent(msg), do: send(self(), {__MODULE__, msg})
end