using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using JetBrains.Annotations;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Localization;
using OpenIddict.Abstractions;
using Volo.Abp;
using Volo.Abp.Authorization.Permissions;
using Volo.Abp.Data;
using Volo.Abp.DependencyInjection;
using Volo.Abp.OpenIddict.Applications;
using Volo.Abp.OpenIddict.Scopes;
using Volo.Abp.PermissionManagement;
using Volo.Abp.Uow;

namespace WinIn.FasterZ.AuthSiteCenter.OpenIddict;

/* Creates initial data that is needed to property run the application
 * and make client-to-server communication possible.
 */
public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDependency
{
    private readonly IConfiguration _configuration;
    private readonly IOpenIddictApplicationRepository _openIddictApplicationRepository;
    private readonly IAbpApplicationManager _applicationManager;
    private readonly IOpenIddictScopeRepository _openIddictScopeRepository;
    private readonly IOpenIddictScopeManager _scopeManager;
    private readonly IPermissionDataSeeder _permissionDataSeeder;
    private readonly IStringLocalizer<OpenIddictResponse> L;

    public OpenIddictDataSeedContributor(
        IConfiguration configuration,
        IOpenIddictApplicationRepository openIddictApplicationRepository,
        IAbpApplicationManager applicationManager,
        IOpenIddictScopeRepository openIddictScopeRepository,
        IOpenIddictScopeManager scopeManager,
        IPermissionDataSeeder permissionDataSeeder,
        IStringLocalizer<OpenIddictResponse> l )
    {
        _configuration = configuration;
        _openIddictApplicationRepository = openIddictApplicationRepository;
        _applicationManager = applicationManager;
        _openIddictScopeRepository = openIddictScopeRepository;
        _scopeManager = scopeManager;
        _permissionDataSeeder = permissionDataSeeder;
        L = l;
    }

    [UnitOfWork]
    public virtual async Task SeedAsync(DataSeedContext context)
    {
        await CreateScopesAsync();
        await CreateApplicationsAsync();
    }

    private async Task CreateScopesAsync()
    {
        if (await _openIddictScopeRepository.FindByNameAsync("AuthSiteCenter") == null)
        {
            await _scopeManager.CreateAsync(new OpenIddictScopeDescriptor {
                Name = "AuthSiteCenter", DisplayName = "AuthSiteCenter API", Resources = { "AuthSiteCenter" }
            });
        }
    }

    private async Task CreateApplicationsAsync()
    {
        var commonScopes = new List<string> {
            OpenIddictConstants.Permissions.Scopes.Address,
            OpenIddictConstants.Permissions.Scopes.Email,
            OpenIddictConstants.Permissions.Scopes.Phone,
            OpenIddictConstants.Permissions.Scopes.Profile,
            OpenIddictConstants.Permissions.Scopes.Roles,
            "AuthSiteCenter"
        };

        var configurationSection = _configuration.GetSection("OpenIddict:Applications");

        //Web Client
        var webClientId = configurationSection["AuthSiteCenter_Web:ClientId"];
        if (!webClientId.IsNullOrWhiteSpace())
        {
            var webClientRootUrl = configurationSection["AuthSiteCenter_Web:RootUrl"].EnsureEndsWith('/');

            /* AuthSiteCenter_Web client is only needed if you created a tiered
             * solution. Otherwise, you can delete this client. */
            await CreateApplicationAsync(
                name: webClientId!,
                type: OpenIddictConstants.ClientTypes.Confidential,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Web Application",
                secret: configurationSection["AuthSiteCenter_Web:ClientSecret"] ?? "1q2w3e*",
                grantTypes: new List<string> //Hybrid flow
                {
                    OpenIddictConstants.GrantTypes.AuthorizationCode, OpenIddictConstants.GrantTypes.Implicit
                },
                scopes: commonScopes,
                redirectUri: $"{webClientRootUrl}signin-oidc",
                clientUri: webClientRootUrl,
                postLogoutRedirectUri: $"{webClientRootUrl}signout-callback-oidc"
            );
        }

        //Console Test / Angular Client
        var consoleAndAngularClientId = configurationSection["AuthSiteCenter_App:ClientId"];
        if (!consoleAndAngularClientId.IsNullOrWhiteSpace())
        {
            var consoleAndAngularClientRootUrl = configurationSection["AuthSiteCenter_App:RootUrl"]?.TrimEnd('/');
            await CreateApplicationAsync(
                name: consoleAndAngularClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Console Test / Angular Application",
                secret: null,
                grantTypes: new List<string> {
                    OpenIddictConstants.GrantTypes.AuthorizationCode,
                    OpenIddictConstants.GrantTypes.Password,
                    OpenIddictConstants.GrantTypes.ClientCredentials,
                    OpenIddictConstants.GrantTypes.RefreshToken
                },
                scopes: commonScopes,
                redirectUri: consoleAndAngularClientRootUrl,
                clientUri: consoleAndAngularClientRootUrl,
                postLogoutRedirectUri: consoleAndAngularClientRootUrl
            );
        }

        // Blazor Client
        var blazorClientId = configurationSection["AuthSiteCenter_Blazor:ClientId"];
        if (!blazorClientId.IsNullOrWhiteSpace())
        {
            var blazorRootUrl = configurationSection["AuthSiteCenter_Blazor:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
                name: blazorClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Blazor Application",
                secret: null,
                grantTypes: new List<string> { OpenIddictConstants.GrantTypes.AuthorizationCode, },
                scopes: commonScopes,
                redirectUri: $"{blazorRootUrl}/authentication/login-callback",
                clientUri: blazorRootUrl,
                postLogoutRedirectUri: $"{blazorRootUrl}/authentication/logout-callback"
            );
        }

        // Blazor Server Tiered Client
        var blazorServerTieredClientId = configurationSection["AuthSiteCenter_BlazorServerTiered:ClientId"];
        if (!blazorServerTieredClientId.IsNullOrWhiteSpace())
        {
            var blazorServerTieredRootUrl =
                configurationSection["AuthSiteCenter_BlazorServerTiered:RootUrl"].EnsureEndsWith('/');

            await CreateApplicationAsync(
                name: blazorServerTieredClientId!,
                type: OpenIddictConstants.ClientTypes.Confidential,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Blazor Server Application",
                secret: configurationSection["AuthSiteCenter_BlazorServerTiered:ClientSecret"] ?? "1q2w3e*",
                grantTypes: new List<string> //Hybrid flow
                {
                    OpenIddictConstants.GrantTypes.AuthorizationCode, OpenIddictConstants.GrantTypes.Implicit
                },
                scopes: commonScopes,
                redirectUri: $"{blazorServerTieredRootUrl}signin-oidc",
                clientUri: blazorServerTieredRootUrl,
                postLogoutRedirectUri: $"{blazorServerTieredRootUrl}signout-callback-oidc"
            );
        }

        // Swagger Client
        var swaggerClientId = configurationSection["AuthSiteCenter_Swagger:ClientId"];
        if (!swaggerClientId.IsNullOrWhiteSpace())
        {
            var swaggerRootUrl = configurationSection["AuthSiteCenter_Swagger:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
                name: swaggerClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Swagger Application",
                secret: null,
                grantTypes: new List<string> { OpenIddictConstants.GrantTypes.AuthorizationCode, },
                scopes: commonScopes,
                redirectUri: $"{swaggerRootUrl}/swagger/oauth2-redirect.html",
                clientUri: swaggerRootUrl
            );
        }
    }

    private async Task CreateApplicationAsync(
        [NotNull] string name,
        [NotNull] string type,
        [NotNull] string consentType,
        string displayName,
        string? secret,
        List<string> grantTypes,
        List<string> scopes,
        string? clientUri = null,
        string? redirectUri = null,
        string? postLogoutRedirectUri = null,
        List<string>? permissions = null)
    {
        if (!string.IsNullOrEmpty(secret) && string.Equals(type, OpenIddictConstants.ClientTypes.Public,
                StringComparison.OrdinalIgnoreCase))
        {
            throw new BusinessException(L["NoClientSecretCanBeSetForPublicApplications"]);
        }

        if (string.IsNullOrEmpty(secret) && string.Equals(type, OpenIddictConstants.ClientTypes.Confidential,
                StringComparison.OrdinalIgnoreCase))
        {
            throw new BusinessException(L["TheClientSecretIsRequiredForConfidentialApplications"]);
        }

        var client = await _openIddictApplicationRepository.FindByClientIdAsync(name);
        
        var application = new AbpApplicationDescriptor {
            ClientId = name,
            Type = type,
            ClientSecret = secret,
            ConsentType = consentType,
            DisplayName = displayName,
            ClientUri = clientUri,
        };

        Check.NotNullOrEmpty(grantTypes, nameof(grantTypes));
        Check.NotNullOrEmpty(scopes, nameof(scopes));

        if (new[] { OpenIddictConstants.GrantTypes.AuthorizationCode, OpenIddictConstants.GrantTypes.Implicit }.All(
                grantTypes.Contains))
        {
            application.Permissions.Add(OpenIddictConstants.Permissions.ResponseTypes.CodeIdToken);

            if (string.Equals(type, OpenIddictConstants.ClientTypes.Public, StringComparison.OrdinalIgnoreCase))
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.ResponseTypes.CodeIdTokenToken);
                application.Permissions.Add(OpenIddictConstants.Permissions.ResponseTypes.CodeToken);
            }
        }

        if (!redirectUri.IsNullOrWhiteSpace() || !postLogoutRedirectUri.IsNullOrWhiteSpace())
        {
            application.Permissions.Add(OpenIddictConstants.Permissions.Endpoints.Logout);
        }

        var buildInGrantTypes = new[] {
            OpenIddictConstants.GrantTypes.Implicit, OpenIddictConstants.GrantTypes.Password,
            OpenIddictConstants.GrantTypes.AuthorizationCode, OpenIddictConstants.GrantTypes.ClientCredentials,
            OpenIddictConstants.GrantTypes.DeviceCode, OpenIddictConstants.GrantTypes.RefreshToken
        };

        foreach (var grantType in grantTypes)
        {
            if (grantType == OpenIddictConstants.GrantTypes.AuthorizationCode)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.GrantTypes.AuthorizationCode);
                application.Permissions.Add(OpenIddictConstants.Permissions.ResponseTypes.Code);
            }

            if (grantType == OpenIddictConstants.GrantTypes.AuthorizationCode ||
                grantType == OpenIddictConstants.GrantTypes.Implicit)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.Endpoints.Authorization);
            }

            if (grantType == OpenIddictConstants.GrantTypes.AuthorizationCode ||
                grantType == OpenIddictConstants.GrantTypes.ClientCredentials ||
                grantType == OpenIddictConstants.GrantTypes.Password ||
                grantType == OpenIddictConstants.GrantTypes.RefreshToken ||
                grantType == OpenIddictConstants.GrantTypes.DeviceCode)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.Endpoints.Token);
                application.Permissions.Add(OpenIddictConstants.Permissions.Endpoints.Revocation);
                application.Permissions.Add(OpenIddictConstants.Permissions.Endpoints.Introspection);
            }

            if (grantType == OpenIddictConstants.GrantTypes.ClientCredentials)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.GrantTypes.ClientCredentials);
            }

            if (grantType == OpenIddictConstants.GrantTypes.Implicit)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.GrantTypes.Implicit);
            }

            if (grantType == OpenIddictConstants.GrantTypes.Password)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.GrantTypes.Password);
            }

            if (grantType == OpenIddictConstants.GrantTypes.RefreshToken)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.GrantTypes.RefreshToken);
            }

            if (grantType == OpenIddictConstants.GrantTypes.DeviceCode)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.GrantTypes.DeviceCode);
                application.Permissions.Add(OpenIddictConstants.Permissions.Endpoints.Device);
            }

            if (grantType == OpenIddictConstants.GrantTypes.Implicit)
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.ResponseTypes.IdToken);
                if (string.Equals(type, OpenIddictConstants.ClientTypes.Public, StringComparison.OrdinalIgnoreCase))
                {
                    application.Permissions.Add(OpenIddictConstants.Permissions.ResponseTypes.IdTokenToken);
                    application.Permissions.Add(OpenIddictConstants.Permissions.ResponseTypes.Token);
                }
            }

            if (!buildInGrantTypes.Contains(grantType))
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.Prefixes.GrantType + grantType);
            }
        }

        var buildInScopes = new[] {
            OpenIddictConstants.Permissions.Scopes.Address, OpenIddictConstants.Permissions.Scopes.Email,
            OpenIddictConstants.Permissions.Scopes.Phone, OpenIddictConstants.Permissions.Scopes.Profile,
            OpenIddictConstants.Permissions.Scopes.Roles
        };

        foreach (var scope in scopes)
        {
            if (buildInScopes.Contains(scope))
            {
                application.Permissions.Add(scope);
            }
            else
            {
                application.Permissions.Add(OpenIddictConstants.Permissions.Prefixes.Scope + scope);
            }
        }

        if (redirectUri != null)
        {
            if (!redirectUri.IsNullOrEmpty())
            {
                if (!Uri.TryCreate(redirectUri, UriKind.Absolute, out var uri) || !uri.IsWellFormedOriginalString())
                {
                    throw new BusinessException(L["InvalidRedirectUri", redirectUri]);
                }

                if (application.RedirectUris.All(x => x != uri))
                {
                    application.RedirectUris.Add(uri);
                }
            }
        }

        if (postLogoutRedirectUri != null)
        {
            if (!postLogoutRedirectUri.IsNullOrEmpty())
            {
                if (!Uri.TryCreate(postLogoutRedirectUri, UriKind.Absolute, out var uri) ||
                    !uri.IsWellFormedOriginalString())
                {
                    throw new BusinessException(L["InvalidPostLogoutRedirectUri", postLogoutRedirectUri]);
                }

                if (application.PostLogoutRedirectUris.All(x => x != uri))
                {
                    application.PostLogoutRedirectUris.Add(uri);
                }
            }
        }

        if (permissions != null)
        {
            await _permissionDataSeeder.SeedAsync(
                ClientPermissionValueProvider.ProviderName,
                name,
                permissions,
                null
            );
        }

        if (client == null)
        {
            await _applicationManager.CreateAsync(application);
            return;
        }

        if (!HasSameRedirectUris(client, application))
        {
            client.RedirectUris = JsonSerializer.Serialize(application.RedirectUris.Select(q => q.ToString().TrimEnd('/')));
            client.PostLogoutRedirectUris = JsonSerializer.Serialize(application.PostLogoutRedirectUris.Select(q => q.ToString().TrimEnd('/')));

            await _applicationManager.UpdateAsync(client.ToModel());
        }

        if (!HasSameScopes(client, application))
        {
            client.Permissions = JsonSerializer.Serialize(application.Permissions.Select(q => q.ToString()));
            await _applicationManager.UpdateAsync(client.ToModel());
        }
    }

    private bool HasSameRedirectUris(OpenIddictApplication existingClient, AbpApplicationDescriptor application)
    {
        return existingClient.RedirectUris == JsonSerializer.Serialize(application.RedirectUris.Select(q => q.ToString().TrimEnd('/')));
    }

    private bool HasSameScopes(OpenIddictApplication existingClient, AbpApplicationDescriptor application)
    {
        return existingClient.Permissions == JsonSerializer.Serialize(application.Permissions.Select(q => q.ToString().TrimEnd('/')));
    }
}