using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using Oqtane.Models;
using Oqtane.Shared;
using Microsoft.AspNetCore.Authorization;
using System.IO;
using System.Reflection;
using System.Linq;
using Microsoft.AspNetCore.Hosting;
using Oqtane.Enums;
using Oqtane.Infrastructure;
using Oqtane.Repository;
using Oqtane.Security;
using System;
using Microsoft.Extensions.DependencyInjection;
using System.Text.Json;

namespace Oqtane.Controllers
{
    [Route(ControllerRoutes.ApiRoute)]
    public class ModuleDefinitionController : Controller
    {
        private readonly IModuleDefinitionRepository _moduleDefinitions;
        private readonly ITenantRepository _tenants;
        private readonly ISqlRepository _sql;
        private readonly IUserPermissions _userPermissions;
        private readonly IInstallationManager _installationManager;
        private readonly IWebHostEnvironment _environment;
        private readonly IServiceProvider _serviceProvider;
        private readonly ILogManager _logger;

        public ModuleDefinitionController(IModuleDefinitionRepository moduleDefinitions, ITenantRepository tenants, ISqlRepository sql, IUserPermissions userPermissions, IInstallationManager installationManager, IWebHostEnvironment environment, IServiceProvider serviceProvider, ILogManager logger)
        {
            _moduleDefinitions = moduleDefinitions;
            _tenants = tenants;
            _sql = sql;
            _userPermissions = userPermissions;
            _installationManager = installationManager;
            _environment = environment;
            _serviceProvider = serviceProvider;
            _logger = logger;
        }

        // GET: api/<controller>?siteid=x
        [HttpGet]
        public IEnumerable<ModuleDefinition> Get(string siteid)
        {
            List<ModuleDefinition> moduledefinitions = new List<ModuleDefinition>();
            foreach(ModuleDefinition moduledefinition in _moduleDefinitions.GetModuleDefinitions(int.Parse(siteid)))
            {
                if (_userPermissions.IsAuthorized(User,PermissionNames.Utilize, moduledefinition.Permissions))
                {
                    moduledefinitions.Add(moduledefinition);
                }
            }
            return moduledefinitions;
        }

        // GET api/<controller>/5?siteid=x
        [HttpGet("{id}")]
        public ModuleDefinition Get(int id, string siteid)
        {
            ModuleDefinition moduledefinition = _moduleDefinitions.GetModuleDefinition(id, int.Parse(siteid));
            if (_userPermissions.IsAuthorized(User,PermissionNames.Utilize, moduledefinition.Permissions))
            {
                return moduledefinition;
            }
            else
            {
                _logger.Log(LogLevel.Error, this, LogFunction.Read, "User Not Authorized To Access ModuleDefinition {ModuleDefinition}", moduledefinition);
                HttpContext.Response.StatusCode = 401;
                return null;
            }
        }

        // PUT api/<controller>/5
        [HttpPut("{id}")]
        [Authorize(Roles = RoleNames.Admin)]
        public void Put(int id, [FromBody] ModuleDefinition moduleDefinition)
        {
            if (ModelState.IsValid)
            {
                _moduleDefinitions.UpdateModuleDefinition(moduleDefinition);
                _logger.Log(LogLevel.Information, this, LogFunction.Update, "Module Definition Updated {ModuleDefinition}", moduleDefinition);
            }
        }

        [HttpGet("install")]
        [Authorize(Roles = RoleNames.Host)]
        public void InstallModules()
        {
            _logger.Log(LogLevel.Information, this, LogFunction.Create, "Modules Installed");
            _installationManager.InstallPackages("Modules");
        }

        // DELETE api/<controller>/5?siteid=x
        [HttpDelete("{id}")]
        [Authorize(Roles = RoleNames.Host)]
        public void Delete(int id, int siteid)
        {
            ModuleDefinition moduledefinition = _moduleDefinitions.GetModuleDefinition(id, siteid);
            if (moduledefinition != null && Utilities.GetAssemblyName(moduledefinition.ServerManagerType) != "Oqtane.Server")
            {
                // execute uninstall logic or scripts
                if (!string.IsNullOrEmpty(moduledefinition.ServerManagerType))
                {
                    Type moduletype = Type.GetType(moduledefinition.ServerManagerType);
                    foreach (Tenant tenant in _tenants.GetTenants())
                    {
                        try
                        {
                            if (moduletype.GetInterface("IInstallable") != null)
                            {
                                var moduleobject = ActivatorUtilities.CreateInstance(_serviceProvider, moduletype);
                                ((IInstallable)moduleobject).Uninstall(tenant);
                            }
                            else
                            {
                                _sql.ExecuteScript(tenant, moduletype.Assembly, Utilities.GetTypeName(moduledefinition.ModuleDefinitionName) + ".Uninstall.sql");
                            }
                            _logger.Log(LogLevel.Information, this, LogFunction.Delete, "{ModuleDefinitionName} Uninstalled For Tenant {Tenant}", moduledefinition.ModuleDefinitionName, tenant.Name);
                        }
                        catch (Exception ex)
                        {
                            _logger.Log(LogLevel.Error, this, LogFunction.Delete, "Error Uninstalling {ModuleDefinitionName} For Tenant {Tenant} {Error}", moduledefinition.ModuleDefinitionName, tenant.Name, ex.Message);
                        }
                    }
                }

                // remove module assets
                string assetpath = Path.Combine(_environment.WebRootPath, "Modules", Utilities.GetTypeName(moduledefinition.ModuleDefinitionName));
                if (System.IO.File.Exists(Path.Combine(assetpath, "assets.json")))
                {
                    // use assets.json to clean up file resources
                    List<string> assets = JsonSerializer.Deserialize<List<string>>(System.IO.File.ReadAllText(Path.Combine(assetpath, "assets.json")));
                    assets.Reverse();
                    foreach(string asset in assets)
                    {
                        // legacy support for assets that were stored as absolute paths
                        string filepath = asset.StartsWith("\\") ? Path.Combine(_environment.ContentRootPath, asset.Substring(1)) : asset;
                        if (System.IO.File.Exists(filepath))
                        {
                            System.IO.File.Delete(filepath);
                            if (!Directory.EnumerateFiles(Path.GetDirectoryName(filepath)).Any())
                            {
                                Directory.Delete(Path.GetDirectoryName(filepath));
                            }
                        }
                    }
                    _logger.Log(LogLevel.Information, this, LogFunction.Delete, "Module Assets Removed For {ModuleDefinitionName}", moduledefinition.ModuleDefinitionName);
                }
                else
                {
                    // attempt to delete assemblies based on naming convention
                    foreach(string asset in Directory.GetFiles(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), Utilities.GetTypeName(moduledefinition.ModuleDefinitionName) + "*.*"))
                    {
                        System.IO.File.Delete(asset);
                    }
                    _logger.Log(LogLevel.Warning, this, LogFunction.Delete, "Module Assets Removed For {ModuleDefinitionName}. Please Note That Some Assets May Have Been Missed Due To A Missing Asset Manifest. An Asset Manifest Is Only Created If A Module Is Installed From A Nuget Package.", moduledefinition.Name);
                }

                // clean up module static resource folder
                if (Directory.Exists(assetpath))
                {
                    Directory.Delete(assetpath, true);
                    _logger.Log(LogLevel.Information, this, LogFunction.Delete, "Module Static Resources Folder Removed For {ModuleDefinitionName}", moduledefinition.ModuleDefinitionName);
                }

                // remove module definition
                _moduleDefinitions.DeleteModuleDefinition(id);
                _logger.Log(LogLevel.Information, this, LogFunction.Delete, "Module Definition {ModuleDefinitionName} Deleted", moduledefinition.Name);
            }
        }

        // GET: api/<controller>/templates
        [HttpGet("templates")]
        [Authorize(Roles = RoleNames.Host)]
        public List<string> GetTemplates()
        {
            var templates = new List<string>();
            string templatePath = Utilities.PathCombine(_environment.WebRootPath, "Modules", "Templates", Path.DirectorySeparatorChar.ToString());
            foreach (string directory in Directory.GetDirectories(templatePath))
            {
                templates.Add(directory.Replace(templatePath, ""));
            }
            return templates;
        }

        // POST api/<controller>
        [HttpPost]
        [Authorize(Roles = RoleNames.Host)]
        public ModuleDefinition Post([FromBody] ModuleDefinition moduleDefinition)
        {
            if (ModelState.IsValid)
            {
                string rootPath;
                DirectoryInfo rootFolder = Directory.GetParent(_environment.ContentRootPath);
                string templatePath = Utilities.PathCombine(_environment.WebRootPath, "Modules", "Templates", moduleDefinition.Template,Path.DirectorySeparatorChar.ToString());

                rootPath = Utilities.PathCombine(rootFolder.Parent.FullName , moduleDefinition.Owner + "." + moduleDefinition.Name,Path.DirectorySeparatorChar.ToString());
                moduleDefinition.ModuleDefinitionName = moduleDefinition.Owner + "." + moduleDefinition.Name + ", " + moduleDefinition.Owner + "." + moduleDefinition.Name + ".Client.Oqtane";                    
                moduleDefinition.ServerManagerType = moduleDefinition.Owner + "." + moduleDefinition.Name + ".Manager." + moduleDefinition.Name + "Manager, " + moduleDefinition.Owner + "." + moduleDefinition.Name + ".Server.Oqtane";

                ProcessTemplatesRecursively(new DirectoryInfo(templatePath), rootPath, rootFolder.Name, templatePath, moduleDefinition);
                _logger.Log(LogLevel.Information, this, LogFunction.Create, "Module Definition Created {ModuleDefinition}", moduleDefinition);
            }

            return moduleDefinition;
        }

        private void ProcessTemplatesRecursively(DirectoryInfo current, string rootPath, string rootFolder, string templatePath, ModuleDefinition moduleDefinition)
        {
            // process folder
            string folderPath = Utilities.PathCombine(rootPath, current.FullName.Replace(templatePath, ""));
            folderPath = folderPath.Replace("[Owner]", moduleDefinition.Owner);
            folderPath = folderPath.Replace("[Module]", moduleDefinition.Name);
            if (!Directory.Exists(folderPath))
            {
                Directory.CreateDirectory(folderPath);
            }

            FileInfo[] files = current.GetFiles("*.*");
            if (files != null)
            {
                foreach (FileInfo file in files)
                {
                    // process file
                    string filePath = Path.Combine(folderPath, file.Name);
                    filePath = filePath.Replace("[Owner]", moduleDefinition.Owner);
                    filePath = filePath.Replace("[Module]", moduleDefinition.Name);

                    string text = System.IO.File.ReadAllText(file.FullName);
                    text = text.Replace("[Owner]", moduleDefinition.Owner);
                    text = text.Replace("[Module]", moduleDefinition.Name);
                    text = text.Replace("[Description]", moduleDefinition.Description);
                    text = text.Replace("[RootPath]", rootPath);
                    text = text.Replace("[RootFolder]", rootFolder);
                    text = text.Replace("[ServerManagerType]", moduleDefinition.ServerManagerType);
                    text = text.Replace("[Folder]", folderPath);
                    text = text.Replace("[File]", Path.GetFileName(filePath));
                    if (moduleDefinition.Version == "local")
                    {
                        text = text.Replace("[FrameworkVersion]", Constants.Version);
                        text = text.Replace("[ClientReference]", "<Reference Include=\"Oqtane.Client\"><HintPath>..\\..\\oqtane.framework\\Oqtane.Server\\bin\\Debug\\net5.0\\Oqtane.Client.dll</HintPath></Reference>");
                        text = text.Replace("[ServerReference]", "<Reference Include=\"Oqtane.Server\"><HintPath>..\\..\\oqtane.framework\\Oqtane.Server\\bin\\Debug\\net5.0\\Oqtane.Server.dll</HintPath></Reference>");
                        text = text.Replace("[SharedReference]", "<Reference Include=\"Oqtane.Shared\"><HintPath>..\\..\\oqtane.framework\\Oqtane.Server\\bin\\Debug\\net5.0\\Oqtane.Shared.dll</HintPath></Reference>");
                    }
                    else
                    {
                        text = text.Replace("[FrameworkVersion]", moduleDefinition.Version);
                        text = text.Replace("[ClientReference]", "<PackageReference Include=\"Oqtane.Client\" Version=\"" + moduleDefinition.Version + "\" />");
                        text = text.Replace("[ServerReference]", "<PackageReference Include=\"Oqtane.Server\" Version=\"" + moduleDefinition.Version + "\" />");
                        text = text.Replace("[SharedReference]", "<PackageReference Include=\"Oqtane.Shared\" Version=\"" + moduleDefinition.Version + "\" />");
                    }
                    System.IO.File.WriteAllText(filePath, text);
                }

                DirectoryInfo[] folders = current.GetDirectories();

                foreach (DirectoryInfo folder in folders.Reverse())
                {
                    ProcessTemplatesRecursively(folder, rootPath, rootFolder, templatePath, moduleDefinition);
                }
            }
        }
    }
}