using System.Reflection;
using FluentAssertions;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using ProposalSystem.Api.Controllers;
using Xunit;

namespace ProposalSystem.Tests.Controllers;

/// <summary>
/// QA-C3: Authorization attribute tests.
/// Verifies that controllers and actions have correct [Authorize] and role requirements.
/// These are static metadata tests — they verify the security annotations exist
/// and are correct without needing to spin up an HTTP server.
/// </summary>
public class AuthorizationAttributeTests
{
    #region Controller-Level Authorization

    [Fact(DisplayName = "QA-C3: ProposalsController requires authentication")]
    public void ProposalsController_HasAuthorizeAttribute()
    {
        typeof(ProposalsController)
            .GetCustomAttribute<AuthorizeAttribute>()
            .Should().NotBeNull("ProposalsController should require authentication");
    }

    [Fact(DisplayName = "QA-C3: AdminController requires admins or sysadmins role")]
    public void AdminController_RequiresAdminOrSysAdminRole()
    {
        var attr = typeof(AdminController).GetCustomAttribute<AuthorizeAttribute>();
        attr.Should().NotBeNull("AdminController should require authentication");
        attr!.Roles.Should().NotBeNull();
        attr.Roles!.Split(',').Select(r => r.Trim()).Should()
            .Contain("admins").And.Contain("sysadmins");
    }

    [Fact(DisplayName = "QA-C3: UsersController requires authentication")]
    public void UsersController_HasAuthorizeAttribute()
    {
        typeof(UsersController)
            .GetCustomAttribute<AuthorizeAttribute>()
            .Should().NotBeNull("UsersController should require authentication");
    }

    #endregion

    #region Action-Level Role Requirements

    [Theory(DisplayName = "QA-C3: Admin-only proposal actions require admins/sysadmins role")]
    [InlineData("Update")]
    [InlineData("Approve")]
    [InlineData("MarkSent")]
    [InlineData("Revise")]
    [InlineData("GetAudit")]
    [InlineData("GetSimilar")]
    [InlineData("GenerateSuggestions")]
    [InlineData("Regenerate")]
    [InlineData("AddSimilarReference")]
    public void ProposalsController_AdminActions_RequireAdminRole(string methodName)
    {
        var method = typeof(ProposalsController).GetMethod(methodName);
        method.Should().NotBeNull($"ProposalsController should have a {methodName} method");

        var attr = method!.GetCustomAttribute<AuthorizeAttribute>();
        attr.Should().NotBeNull($"{methodName} should have [Authorize] attribute");
        attr!.Roles.Should().NotBeNull($"{methodName} should specify roles");
        attr.Roles!.Split(',').Select(r => r.Trim()).Should()
            .Contain("admins", $"{methodName} should allow admins")
            .And.Contain("sysadmins", $"{methodName} should allow sysadmins");
    }

    [Theory(DisplayName = "QA-C3: Dispatcher-accessible proposal actions do NOT have role restrictions")]
    [InlineData("Create")]
    [InlineData("GetAll")]
    [InlineData("GetById")]
    [InlineData("GetHistory")]
    [InlineData("GetStats")]
    public void ProposalsController_DispatcherActions_NoRoleRestriction(string methodName)
    {
        var method = typeof(ProposalsController).GetMethod(methodName);
        method.Should().NotBeNull($"ProposalsController should have a {methodName} method");

        var attr = method!.GetCustomAttribute<AuthorizeAttribute>();
        // These methods rely on controller-level [Authorize] but have no role restriction
        if (attr != null)
        {
            attr.Roles.Should().BeNullOrEmpty($"{methodName} should be accessible to all authenticated users");
        }
    }

    [Theory(DisplayName = "QA-C3: SysAdmin-only user management actions require sysadmins role")]
    [InlineData("GetAll")]
    [InlineData("UpdateRole")]
    public void UsersController_SysAdminActions_RequireSysAdminRole(string methodName)
    {
        var method = typeof(UsersController).GetMethod(methodName);
        method.Should().NotBeNull($"UsersController should have a {methodName} method");

        var attr = method!.GetCustomAttribute<AuthorizeAttribute>();
        attr.Should().NotBeNull($"{methodName} should have [Authorize] attribute");
        attr!.Roles.Should().NotBeNull($"{methodName} should specify roles");
        attr.Roles!.Split(',').Select(r => r.Trim()).Should()
            .Contain("sysadmins", $"{methodName} should require sysadmins role");
    }

    [Fact(DisplayName = "QA-C3: UsersController.GetMe is accessible to all authenticated users")]
    public void UsersController_GetMe_NoRoleRestriction()
    {
        var method = typeof(UsersController).GetMethod("GetMe");
        method.Should().NotBeNull();

        var attr = method!.GetCustomAttribute<AuthorizeAttribute>();
        // GetMe should rely on controller-level [Authorize] without role restriction
        if (attr != null)
        {
            attr.Roles.Should().BeNullOrEmpty("GetMe should be accessible to all authenticated users");
        }
    }

    #endregion

    #region Role Hierarchy Verification

    [Fact(DisplayName = "QA-C3: Dispatchers cannot access admin dashboard")]
    public void AdminController_NotAccessibleToDispatchers()
    {
        var attr = typeof(AdminController).GetCustomAttribute<AuthorizeAttribute>();
        attr.Should().NotBeNull();
        attr!.Roles.Should().NotBeNull();

        var roles = attr.Roles!.Split(',').Select(r => r.Trim()).ToList();
        roles.Should().NotContain("dispatchers",
            "dispatchers must not have access to admin controller");
    }

    [Fact(DisplayName = "QA-C3: Dispatchers cannot access user management")]
    public void UsersController_GetAll_NotAccessibleToDispatchers()
    {
        var method = typeof(UsersController).GetMethod("GetAll");
        var attr = method!.GetCustomAttribute<AuthorizeAttribute>();
        attr.Should().NotBeNull();
        attr!.Roles.Should().NotBeNull();

        var roles = attr.Roles!.Split(',').Select(r => r.Trim()).ToList();
        roles.Should().NotContain("dispatchers",
            "dispatchers must not have access to user management");
    }

    [Fact(DisplayName = "QA-C3: Admins cannot access sysadmin-only user management")]
    public void UsersController_UpdateRole_NotAccessibleToAdmins()
    {
        var method = typeof(UsersController).GetMethod("UpdateRole");
        var attr = method!.GetCustomAttribute<AuthorizeAttribute>();
        attr.Should().NotBeNull();

        var roles = attr!.Roles!.Split(',').Select(r => r.Trim()).ToList();
        roles.Should().NotContain("admins",
            "admins must not have access to role management (sysadmins only)");
    }

    #endregion

    #region All Controllers Must Have [Authorize]

    [Theory(DisplayName = "QA-C3: All API controllers (except AuthController) require authentication")]
    [InlineData(typeof(ProposalsController))]
    [InlineData(typeof(AdminController))]
    [InlineData(typeof(UsersController))]
    [InlineData(typeof(CustomersController))]
    [InlineData(typeof(LineItemsController))]
    [InlineData(typeof(GeneratedPdfsController))]
    [InlineData(typeof(FilesController))]
    [InlineData(typeof(VendorProposalsController))]
    public void AllControllers_HaveAuthorizeAttribute(Type controllerType)
    {
        var attr = controllerType.GetCustomAttribute<AuthorizeAttribute>();
        attr.Should().NotBeNull(
            $"{controllerType.Name} must have [Authorize] attribute to prevent unauthenticated access");
    }

    #endregion
}