defmodule MvWeb.Layouts.SidebarTest do
  @moduledoc """
  Unit tests for the Sidebar component.

  Tests cover:
  - Basic rendering and structure
  - Props handling (current_user, club_name, mobile)
  - Menu structure (flat and nested items)
  - Footer/Profile section
  - Accessibility attributes (ARIA labels, roles)
  - CSS classes (DaisyUI conformance)
  - Icon rendering
  - Conditional visibility
  """
  use MvWeb.ConnCase, async: true

  import Phoenix.LiveViewTest
  import MvWeb.Layouts.Sidebar

  # =============================================================================
  # Helper Functions
  # =============================================================================

  # Returns assigns for an authenticated user with all required attributes.
  defp authenticated_assigns(mobile \\ false) do
    %{
      current_user: %{id: "user-123", email: "test@example.com"},
      club_name: "Test Club",
      mobile: mobile
    }
  end

  # Returns assigns for a guest user (not authenticated).
  defp guest_assigns(mobile \\ false) do
    %{
      current_user: nil,
      club_name: "Test Club",
      mobile: mobile
    }
  end

  # Renders the sidebar component with the given assigns.
  defp render_sidebar(assigns) do
    render_component(&sidebar/1, assigns)
  end

  # Checks if the HTML contains a specific CSS class.
  defp has_class?(html, class) do
    html =~ class
  end

  # =============================================================================
  # Group 1: Basic Rendering (T1.1-T1.3)
  # =============================================================================

  describe "basic rendering" do
    test "T1.1: renders sidebar with main navigation structure" do
      html = render_sidebar(authenticated_assigns())

      # Check for navigation element with correct ID
      assert html =~ ~s(id="main-sidebar")
      assert html =~ ~s(aria-label="Main navigation")

      # Check for sidebar class
      assert has_class?(html, "sidebar")
    end

    test "T1.2: renders logo correctly" do
      html = render_sidebar(authenticated_assigns())

      # Check for logo image
      assert html =~ ~s(src="/images/mila.svg")
      assert html =~ ~s(alt="Mila Logo")

      # Check logo has correct size class
      assert has_class?(html, "size-8")
    end

    test "T1.3: renders toggle button with correct attributes (desktop only)" do
      html = render_sidebar(authenticated_assigns(false))

      # Check for toggle button
      assert html =~ ~s(id="sidebar-toggle")
      assert html =~ "onclick="

      # Check for DaisyUI button classes
      assert has_class?(html, "btn")
      assert has_class?(html, "btn-ghost")
      assert has_class?(html, "btn-sm")
      assert has_class?(html, "btn-square")

      # Check for both toggle icons (expanded and collapsed)
      assert has_class?(html, "sidebar-expanded-icon")
      assert has_class?(html, "sidebar-collapsed-icon")
    end

    test "T1.4: does not render toggle button on mobile" do
      html = render_sidebar(authenticated_assigns(true))

      # Toggle button should not be rendered on mobile
      refute html =~ ~s(id="sidebar-toggle")
    end
  end

  # =============================================================================
  # Group 2: Props Handling (T2.1-T2.3)
  # =============================================================================

  describe "props handling" do
    test "T2.1: displays club name when provided" do
      assigns = %{
        current_user: %{id: "user-1", email: "test@example.com"},
        club_name: "My Awesome Club",
        mobile: false
      }

      html = render_sidebar(assigns)

      assert html =~ "My Awesome Club"
    end

    test "T2.2: does not render menu items when current_user is nil" do
      html = render_sidebar(guest_assigns())

      # Navigation menu should not be rendered
      refute html =~ ~s(role="menubar")
      refute html =~ ~s(role="menuitem")

      # Footer section should not be rendered
      refute html =~ "theme-controller"
      refute html =~ "locale-select"
    end

    test "T2.3: renders menu items when current_user is present" do
      html = render_sidebar(authenticated_assigns())

      # Check that menu structure exists
      assert html =~ ~s(role="menubar")
      assert html =~ ~s(role="menuitem")

      # Check that top-level menu items exist (at least one)
      # Count menu items with tooltips (top-level items have tooltips)
      menu_item_count = html |> String.split("data-tip=") |> length() |> Kernel.-(1)
      assert menu_item_count > 0, "Should have at least one top-level menu item"

      # Check that nested menu groups exist
      assert html =~ "<details"
      assert has_class?(html, "expanded-menu-group")

      # Check that nested menu items exist
      assert html =~ ~s(role="menu")
    end

    test "T2.4: renders sidebar with main-sidebar ID" do
      html = render_sidebar(authenticated_assigns(true))

      assert html =~ ~s(id="main-sidebar")
    end

    test "T2.5: renders sidebar with main-sidebar ID on desktop" do
      html = render_sidebar(authenticated_assigns(false))

      assert html =~ ~s(id="main-sidebar")
    end
  end

  # =============================================================================
  # Group 3: Menu Structure (T3.1-T3.3)
  # =============================================================================

  describe "menu structure" do
    test "T3.1: renders flat menu items with icons and labels" do
      html = render_sidebar(authenticated_assigns())

      # Check that top-level menu items have structure
      # Top-level items have tooltips
      assert html =~ "data-tip="
      assert has_class?(html, "tooltip")
      assert has_class?(html, "tooltip-right")

      # Check that menu items have icons (hero-* classes)
      assert html =~ ~r/hero-\w+/

      # Check that menu items have labels
      assert has_class?(html, "menu-label")

      # Check that menu items have links
      assert html =~ ~s(role="menuitem")
    end

    test "T3.2: renders nested menu with details element for expanded state" do
      html = render_sidebar(authenticated_assigns())

      # Check for nested menu structure
      assert html =~ "<details"
      assert html =~ "<summary"
      assert has_class?(html, "expanded-menu-group")

      # Check that nested menu has subitems
      assert html =~ ~s(role="menu")

      # Check that subitems exist (at least one link in nested menu)
      # Submenu items have role="menuitem" but no data-tip attribute
      # (Top-level items have data-tip, nested items don't)
      # Count menuitems vs data-tips - nested items don't have data-tip
      menuitem_count = html |> String.split(~s(role="menuitem")) |> length() |> Kernel.-(1)
      data_tip_count = html |> String.split("data-tip=") |> length() |> Kernel.-(1)

      # There should be more menuitems than data-tips (nested items don't have data-tip)
      assert menuitem_count > data_tip_count,
        "Should have nested menu items (menuitems without data-tip)"
    end

    test "T3.3: renders nested menu with dropdown for collapsed state" do
      html = render_sidebar(authenticated_assigns())

      # Check for collapsed dropdown structure
      assert has_class?(html, "collapsed-menu-group")
      assert has_class?(html, "dropdown")
      assert has_class?(html, "dropdown-right")
      assert has_class?(html, "dropdown-content")

      # Check that dropdown button has icon (any hero icon)
      assert html =~ ~r/hero-\w+/

      # Check ARIA attributes
      assert html =~ ~s(aria-haspopup="menu")
    end
  end

  # =============================================================================
  # Group 4: Footer/Profile Section (T4.1-T4.3)
  # =============================================================================

  describe "footer/profile section" do
    test "T4.1: renders footer section when user is authenticated" do
      html = render_sidebar(authenticated_assigns())

      # Check for footer container with mt-auto
      assert has_class?(html, "mt-auto")

      # Check for language selector form
      assert html =~ ~s(action="/set_locale")

      # Check for theme toggle
      assert has_class?(html, "theme-controller")

      # Check for user menu/avatar
      assert has_class?(html, "avatar")
    end

    test "T4.2: renders language selector with form and options" do
      html = render_sidebar(authenticated_assigns())

      # Check for form with correct action
      assert html =~ ~s(action="/set_locale")
      assert html =~ ~s(method="post")

      # Check for CSRF token
      assert html =~ "_csrf_token"

      # Check for select element
      assert html =~ ~s(name="locale")

      # Check for language options
      assert html =~ ~s(value="de")
      assert html =~ "Deutsch"
      assert html =~ ~s(value="en")
      assert html =~ "English"

      # Check expanded-only class
      assert has_class?(html, "expanded-only")
    end

    test "T4.3: renders user dropdown with profile and logout links" do
      assigns = %{
        current_user: %{id: "user-456", email: "test@example.com"},
        club_name: "Test Club",
        mobile: false
      }

      html = render_sidebar(assigns)

      # Check for dropdown container
      assert has_class?(html, "dropdown")
      assert has_class?(html, "dropdown-top")

      # Check for avatar button
      assert html =~ ~s(aria-haspopup="menu")

      # Check for profile link (with user ID)
      assert html =~ ~s(href="/users/user-456")

      # Check for logout link
      assert html =~ ~s(href="/sign-out")

      # Check for DaisyUI dropdown classes
      assert has_class?(html, "dropdown-content")
    end

    test "T4.4: renders user avatar with placeholder" do
      assigns = %{
        current_user: %{id: "user-789", email: "alice@example.com"},
        club_name: "Test Club",
        mobile: false
      }

      html = render_sidebar(assigns)

      # Should have avatar placeholder classes
      assert has_class?(html, "avatar")
      assert has_class?(html, "placeholder")
      assert has_class?(html, "bg-neutral")
      assert has_class?(html, "text-neutral-content")
    end
  end

  # =============================================================================
  # Group 5: Accessibility Attributes (T5.1-T5.5)
  # =============================================================================

  describe "accessibility attributes" do
    test "T5.1: navigation has correct ARIA label" do
      html = render_sidebar(authenticated_assigns())

      assert html =~ ~s(aria-label="Main navigation")
    end

    test "T5.2: toggle button has correct ARIA attributes" do
      html = render_sidebar(authenticated_assigns(false))

      # Toggle button
      assert html =~ ~s(aria-label="Toggle sidebar")
      assert html =~ ~s(aria-controls="main-sidebar")
      assert html =~ ~s(aria-expanded="true")
    end

    test "T5.3: menu has correct roles" do
      html = render_sidebar(authenticated_assigns())

      # Main menu should have menubar role
      assert html =~ ~s(role="menubar")

      # List items should have role="none"
      assert html =~ ~s(role="none")

      # Links should have role="menuitem"
      assert html =~ ~s(role="menuitem")
    end

    test "T5.4: nested menu has correct ARIA attributes" do
      html = render_sidebar(authenticated_assigns())

      # Details summary should have haspopup
      assert html =~ ~s(aria-haspopup="true")

      # Dropdown button should have haspopup
      assert html =~ ~s(aria-haspopup="menu")

      # Nested menus should have role="menu"
      assert html =~ ~s(role="menu")
    end

    test "T5.5: icons are hidden from screen readers" do
      html = render_sidebar(authenticated_assigns())

      # Icons should have aria-hidden="true"
      assert html =~ ~s(aria-hidden="true")
    end
  end

  # =============================================================================
  # Group 6: CSS Classes - DaisyUI Conformance (T6.1-T6.4)
  # =============================================================================

  describe "CSS classes - DaisyUI conformance" do
    test "T6.1: uses correct DaisyUI menu classes" do
      html = render_sidebar(authenticated_assigns())

      # menu class on ul
      assert has_class?(html, "menu")
    end

    test "T6.2: uses correct DaisyUI button classes" do
      html = render_sidebar(authenticated_assigns(false))

      # Button classes
      assert has_class?(html, "btn")
      assert has_class?(html, "btn-ghost")
      assert has_class?(html, "btn-sm")
      assert has_class?(html, "btn-square")
    end

    test "T6.3: uses correct tooltip classes" do
      html = render_sidebar(authenticated_assigns())

      # Tooltip classes for menu items
      assert has_class?(html, "tooltip")
      assert has_class?(html, "tooltip-right")
    end

    test "T6.4: uses correct dropdown classes" do
      html = render_sidebar(authenticated_assigns())

      # Dropdown classes
      assert has_class?(html, "dropdown")
      assert has_class?(html, "dropdown-right")
      assert has_class?(html, "dropdown-top")
      assert has_class?(html, "dropdown-content")
      assert has_class?(html, "rounded-box")
    end
  end

  # =============================================================================
  # Group 7: Icon Rendering (T7.1-T7.2)
  # =============================================================================

  describe "icon rendering" do
    test "T7.1: renders hero icons for menu items" do
      html = render_sidebar(authenticated_assigns())

      # Check that hero icons are present (pattern matching)
      assert html =~ ~r/hero-\w+/

      # Check that icons have aria-hidden
      assert html =~ ~s(aria-hidden="true")

      # Check for specific structural icons (toggle, theme) that should always exist
      assert html =~ "hero-chevron-left"
      assert html =~ "hero-chevron-right"
      assert html =~ "hero-sun"
      assert html =~ "hero-moon"
    end

    test "T7.2: renders icons for theme toggle" do
      html = render_sidebar(authenticated_assigns())

      # Theme toggle icons (sun and moon)
      assert html =~ "hero-sun"
      assert html =~ "hero-moon"
    end
  end

  # =============================================================================
  # Group 8: State-dependent classes (T8.1-T8.3)
  # =============================================================================

  describe "state-dependent classes" do
    test "T8.1: expanded-only elements have correct CSS class" do
      html = render_sidebar(authenticated_assigns())

      # Language form should be expanded-only
      assert has_class?(html, "expanded-only")
    end

    test "T8.2: menu-label class is used for text that hides when collapsed" do
      html = render_sidebar(authenticated_assigns())

      # Menu labels that hide in collapsed state
      assert has_class?(html, "menu-label")
    end

    test "T8.3: toggle button has state icons" do
      html = render_sidebar(authenticated_assigns(false))

      # Expanded icon
      assert has_class?(html, "sidebar-expanded-icon")

      # Collapsed icon
      assert has_class?(html, "sidebar-collapsed-icon")
    end
  end

  # =============================================================================
  # Additional Edge Cases and Validation
  # =============================================================================

  describe "edge cases" do
    test "handles user with minimal attributes" do
      assigns = %{
        current_user: %{id: "minimal-user", email: "min@test.com"},
        club_name: "Minimal Club",
        mobile: false
      }

      html = render_sidebar(assigns)

      # Should render without error
      assert html =~ "Minimal Club"
      assert html =~ ~s(href="/users/minimal-user")
    end

    test "handles empty club name" do
      assigns = %{
        current_user: %{id: "user-1", email: "test@test.com"},
        club_name: "",
        mobile: false
      }

      html = render_sidebar(assigns)

      # Should render without error
      assert html =~ ~s(id="main-sidebar")
    end

    test "sidebar structure is complete with all sections" do
      html = render_sidebar(authenticated_assigns())

      # Header section
      assert html =~ "Mila Logo"
      assert html =~ ~s(src="/images/mila.svg")

      # Navigation section
      assert html =~ ~s(role="menubar")
      assert html =~ ~s(id="main-sidebar")

      # Check that menu has items (at least one top-level item)
      assert html =~ ~s(role="menuitem")

      # Check that nested menus exist
      assert html =~ "<details"

      # Footer section
      assert html =~ "theme-controller"
      assert html =~ ~s(action="/set_locale")

      # Check that critical navigation exists (at least /members)
      assert html =~ ~s(href="/members"), "Critical /members route should exist"
    end
  end

  # =============================================================================
  # Component Tests - sidebar_header/1
  # =============================================================================

  describe "sidebar_header/1" do
    test "renders logo with correct size" do
      html = render_sidebar(authenticated_assigns())

      # Logo is size-8 (32px)
      assert html =~ ~s(src="/images/mila.svg")
      assert html =~ ~s(alt="Mila Logo")
      assert has_class?(html, "size-8")

      # Logo is always visible (no conditional classes)
      assert html =~ ~s(<img)
    end

    test "renders club name" do
      assigns = %{
        current_user: %{id: "user-1", email: "test@example.com"},
        club_name: "My Test Club",
        mobile: false
      }

      html = render_sidebar(assigns)

      # Club name is present
      assert html =~ "My Test Club"
      assert has_class?(html, "menu-label")
    end

    test "renders toggle button for desktop" do
      html = render_sidebar(authenticated_assigns(false))

      # Toggle button has both icons
      assert has_class?(html, "sidebar-expanded-icon")
      assert has_class?(html, "sidebar-collapsed-icon")

      # Toggle button is not mobile (hidden on mobile)
      assert html =~ ~s(id="sidebar-toggle")
      assert html =~ ~s(aria-label="Toggle sidebar")
      assert html =~ ~s(aria-expanded="true")
    end

    test "does not render toggle button on mobile" do
      html = render_sidebar(authenticated_assigns(true))

      # Toggle button should not be rendered on mobile
      refute html =~ ~s(id="sidebar-toggle")
    end
  end

  # =============================================================================
  # Component Tests - menu_item/1
  # =============================================================================

  describe "menu_item/1" do
    test "renders icon and label" do
      html = render_sidebar(authenticated_assigns())

      # Icon is visible
      assert html =~ "hero-users"
      assert html =~ ~s(aria-hidden="true")

      # Label is present
      assert html =~ "Members"
      assert has_class?(html, "menu-label")
    end

    test "has tooltip with correct text" do
      html = render_sidebar(authenticated_assigns())

      # data-tip attribute set
      assert html =~ ~s(data-tip="Members")
      assert has_class?(html, "tooltip")
      assert has_class?(html, "tooltip-right")
    end

    test "has correct link" do
      html = render_sidebar(authenticated_assigns())

      # navigate attribute correct (rendered as href)
      assert html =~ ~s(href="/members")
      assert html =~ ~s(role="menuitem")
    end
  end

  # =============================================================================
  # Component Tests - menu_group/1
  # =============================================================================

  describe "menu_group/1" do
    test "renders expanded menu group" do
      html = render_sidebar(authenticated_assigns())

      # details/summary present
      assert html =~ "<details"
      assert html =~ "<summary"
      assert has_class?(html, "expanded-menu-group")
    end

    test "renders collapsed menu group" do
      html = render_sidebar(authenticated_assigns())

      # dropdown present
      assert has_class?(html, "collapsed-menu-group")
      assert has_class?(html, "dropdown")
      assert has_class?(html, "dropdown-right")
    end

    test "renders submenu items" do
      html = render_sidebar(authenticated_assigns())

      # Check that nested menu structure exists
      assert html =~ ~s(role="menu")

      # Check that subitems are rendered (links within nested menu)
      # Submenu items have role="menuitem" but no data-tip attribute
      # (Top-level items have data-tip, nested items don't)
      # Count menuitems vs data-tips - nested items don't have data-tip
      menuitem_count = html |> String.split(~s(role="menuitem")) |> length() |> Kernel.-(1)
      data_tip_count = html |> String.split("data-tip=") |> length() |> Kernel.-(1)

      # There should be more menuitems than data-tips (nested items don't have data-tip)
      assert menuitem_count > data_tip_count,
        "Should have nested menu items (menuitems without data-tip)"

      # Verify nested menu structure exists
      assert html =~ ~s(role="menu")
    end
  end

  # =============================================================================
  # Component Tests - sidebar_footer/1
  # =============================================================================

  describe "sidebar_footer/1" do
    test "renders at bottom of sidebar" do
      html = render_sidebar(authenticated_assigns())

      # mt-auto present
      assert has_class?(html, "mt-auto")
    end

    test "renders theme toggle" do
      html = render_sidebar(authenticated_assigns())

      # Toggle is always visible
      assert has_class?(html, "theme-controller")
      assert html =~ "hero-sun"
      assert html =~ "hero-moon"
    end

    test "renders language selector in expanded only" do
      html = render_sidebar(authenticated_assigns())

      # expanded-only class
      assert has_class?(html, "expanded-only")
      assert html =~ ~s(action="/set_locale")
    end

    test "renders user menu with avatar" do
      assigns = %{
        current_user: %{id: "user-123", email: "alice@example.com"},
        club_name: "Test Club",
        mobile: false
      }

      html = render_sidebar(assigns)

      # Avatar present
      assert has_class?(html, "avatar")
      assert has_class?(html, "placeholder")

      # First letter correct (A for alice@example.com)
      assert html =~ "A"
    end
  end

  # =============================================================================
  # Integration Tests - Sidebar State Management
  # =============================================================================

  describe "sidebar state management" do
    test "sidebar starts expanded by default" do
      # The data-sidebar-expanded attribute is set in layouts.ex, not in sidebar.ex
      # This test verifies the sidebar structure supports the expanded state
      html = render_sidebar(authenticated_assigns())

      # Sidebar has classes that support expanded state
      assert has_class?(html, "menu-label")
      assert has_class?(html, "expanded-only")
    end

    test "toggle button has correct onclick handler" do
      html = render_sidebar(authenticated_assigns(false))

      # Toggle button has onclick handler
      assert html =~ ~r/onclick="toggleSidebar\(\)"/
    end

    test "no duplicate IDs in layout" do
      html = render_sidebar(authenticated_assigns())

      # Check that main-sidebar ID appears only once
      id_count = html |> String.split(~r/id="main-sidebar"/) |> length() |> Kernel.-(1)
      assert id_count == 1, "main-sidebar ID should appear exactly once"

      # Check that sidebar-toggle ID appears only once (if present)
      if html =~ ~r/id="sidebar-toggle"/ do
        toggle_count = html |> String.split(~r/id="sidebar-toggle"/) |> length() |> Kernel.-(1)
        assert toggle_count == 1, "sidebar-toggle ID should appear exactly once"
      end
    end
  end

  # =============================================================================
  # Integration Tests - Mobile Drawer
  # =============================================================================

  describe "mobile drawer" do
    test "mobile header renders on small screens" do
      # Mobile header is in layouts.ex, not sidebar.ex
      # This test verifies sidebar works correctly with mobile flag
      html = render_sidebar(authenticated_assigns(true))

      # Sidebar should render without toggle button on mobile
      refute html =~ ~s(id="sidebar-toggle")
    end

    test "drawer overlay is present" do
      html = render_sidebar(authenticated_assigns())

      # Drawer overlay label for mobile
      assert html =~ ~s(for="mobile-drawer")
      assert has_class?(html, "drawer-overlay")
      assert html =~ ~s(lg:hidden)
    end
  end

  # =============================================================================
  # Accessibility Tests - Extended
  # =============================================================================

  describe "accessibility - extended" do
    test "sidebar has aria-label" do
      html = render_sidebar(authenticated_assigns())

      assert html =~ ~s(aria-label="Main navigation")
    end

    test "toggle button has aria-label and aria-expanded" do
      html = render_sidebar(authenticated_assigns(false))

      # aria-label present
      assert html =~ ~s(aria-label="Toggle sidebar")

      # aria-expanded="true" or "false"
      assert html =~ ~s(aria-expanded="true") || html =~ ~s(aria-expanded="false")
    end

    test "menu items have role attributes" do
      html = render_sidebar(authenticated_assigns())

      # role="menubar", "menuitem", "menu"
      assert html =~ ~s(role="menubar")
      assert html =~ ~s(role="menuitem")
      assert html =~ ~s(role="menu")
    end

    test "icons have aria-hidden" do
      html = render_sidebar(authenticated_assigns())

      # Decorative icons: aria-hidden="true"
      # Count occurrences to ensure multiple icons have it
      assert html =~ ~s(aria-hidden="true")
    end

    test "user menu has aria-haspopup" do
      html = render_sidebar(authenticated_assigns())

      # aria-haspopup="menu"
      assert html =~ ~s(aria-haspopup="menu")
    end
  end

  # =============================================================================
  # Regression Tests
  # =============================================================================

  describe "regression tests" do
    test "no duplicate profile links" do
      html = render_sidebar(authenticated_assigns())

      # Only one Profile link in DOM
      profile_count = html |> String.split(~s[href="/users/"]) |> length() |> Kernel.-(1)
      assert profile_count <= 1, "Should have at most one profile link"
    end

    test "nested menu has only one hover effect" do
      html = render_sidebar(authenticated_assigns())

      # Check that menu-group has proper structure
      # Both expanded and collapsed versions should be present
      assert has_class?(html, "expanded-menu-group")
      assert has_class?(html, "collapsed-menu-group")

      # Details element should not have duplicate hover classes
      # (CSS handles this, but we verify structure)
      assert html =~ "<details"
    end

    test "tooltips only visible when collapsed" do
      html = render_sidebar(authenticated_assigns())

      # Tooltip classes are present (CSS handles visibility)
      assert has_class?(html, "tooltip")
      assert has_class?(html, "tooltip-right")
      assert html =~ "data-tip="
    end

    test "user menu dropdown has correct structure" do
      html = render_sidebar(authenticated_assigns())

      # Dropdown should have proper classes
      assert has_class?(html, "dropdown")
      assert has_class?(html, "dropdown-top")
      assert has_class?(html, "dropdown-content")

      # Should have both Profile and Logout links
      assert html =~ "sign-out"
    end
  end
end