using System.Linq;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Authorization;
using Microsoft.Extensions.Logging;
using AyaNova.Models;
using AyaNova.Util;
using AyaNova.Api.ControllerHelpers;
using AyaNova.Biz;
using System.Threading.Tasks;
using System;
using System.IO;

namespace AyaNova.Api.Controllers
{

    /// <summary>
    /// Log files controller
    /// </summary>
    [ApiController]
    [Asp.Versioning.ApiVersion("8.0")]
    [Route("api/v{version:apiVersion}/log-file")]
    //[Produces("application/json")]
    [Authorize]
    public class LogFilesController : ControllerBase
    {
        private readonly AyContext ct;
        private readonly ILogger<LogFilesController> log;
        private readonly ApiServerState serverState;


        /// <summary>
        /// ctor
        /// </summary>
        /// <param name="dbcontext"></param>
        /// <param name="logger"></param>
        /// <param name="apiServerState"></param>
        public LogFilesController(AyContext dbcontext, ILogger<LogFilesController> logger, ApiServerState apiServerState)
        {
            ct = dbcontext;
            log = logger;
            serverState = apiServerState;
        }




        /// <summary>
        /// Get server log 
        /// </summary>
        /// <param name="logname"></param>
        /// <returns>A single log file in plain text</returns>
        [HttpGet("{logname}")]
        public ActionResult GetLog([FromRoute] string logname)
        {
            //NOTE: this route deliberately open even when server closed as a troubleshooting measure

            if (!Authorized.HasReadFullRole(HttpContext.Items, AyaType.LogFile))
            {
                return StatusCode(403, new ApiNotAuthorizedResponse());
            }

            if (!ModelState.IsValid)
            {
                return BadRequest(new ApiErrorResponse(ModelState));
            }

            //stream the file contents into a json object and return

            //build the full path from the log file name and defined path
            var logFilePath = System.IO.Path.Combine(ServerBootConfig.AYANOVA_LOG_PATH, logname);
            //does file exist?
            if (!System.IO.File.Exists(logFilePath))
            {
                return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
            }


            //Log

            //nlog update now locks file for writing so needs to be opened this way
            FileStreamOptions fso = new FileStreamOptions();
            fso.Access = FileAccess.Read;
            fso.Mode = FileMode.Open;
            fso.Share = FileShare.ReadWrite;
            using (StreamReader sr = new StreamReader(logFilePath, fso))
            {
                return Content(sr.ReadToEnd());
            }
            //return Content(System.IO.File.ReadAllText(logFilePath));

        }



        /// <summary>
        /// Get list of operations logs 
        /// </summary>
        /// <returns></returns>            
        [HttpGet()]
        public ActionResult ListLogs()
        {
            //NOTE: this route deliberately open even when server closed as a troubleshooting measure

            if (!Authorized.HasReadFullRole(HttpContext.Items, AyaType.LogFile))
            {
                return StatusCode(403, new ApiNotAuthorizedResponse());
            }

            if (!ModelState.IsValid)
            {
                return BadRequest(new ApiErrorResponse(ModelState));
            }


            //Iterate all log files and build return
            var files = System.IO.Directory.GetFiles(ServerBootConfig.AYANOVA_LOG_PATH, "log-ayanova*.txt");

            var ret = files.Where(z => !z.EndsWith("ayanova.txt")).OrderByDescending(z => z).Select(z => System.IO.Path.GetFileName(z)).ToList();
            ret.Insert(0, "log-ayanova.txt");
            return Ok(ApiOkResponse.Response(ret));
        }


        /// <summary>
        /// Download log
        /// </summary>
        /// <param name="logname"></param>
        /// <param name="t">download token</param>
        /// <returns>A single log file</returns>
        [AllowAnonymous]
        [HttpGet("download/{logname}")]
        public async Task<IActionResult> DownloadLog([FromRoute] string logname, [FromQuery] string t)
        {
            //NOTE: this route deliberately open even when server closed as a troubleshooting measure

            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));

            var user = await UserBiz.ValidateDownloadTokenAndReturnUserAsync(t, ct);
            if (user == null)
            {
                await Task.Delay(AyaNova.Util.ServerBootConfig.FAILED_AUTH_DELAY);//DOS protection
                return StatusCode(401, new ApiErrorResponse(ApiErrorCode.AUTHENTICATION_FAILED));
            }

            if (!Authorized.HasReadFullRole(user.Roles, AyaType.LogFile))
                return StatusCode(403, new ApiNotAuthorizedResponse());

            var logFilePath = System.IO.Path.Combine(ServerBootConfig.AYANOVA_LOG_PATH, logname);
            if (!System.IO.File.Exists(logFilePath))
                return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
                
            //Note: this works with new Nlog file locking for write so it must be opening it as read and shareable 
            return PhysicalFile(logFilePath, "text/plain", $"{DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss")}-{logname}");
        }

        //------------


    }
}