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


namespace AyaNova.Api.Controllers
{
    [ApiController]
    [ApiVersion("8.0")]
    [Route("api/v{version:apiVersion}/part")]
    [Produces("application/json")]
    [Authorize]
    public class PartController : ControllerBase
    {
        private readonly AyContext ct;
        private readonly ILogger<PartController> log;
        private readonly ApiServerState serverState;

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

        /// <summary>
        /// Create Part
        /// </summary>
        /// <param name="newObject"></param>
        /// <param name="apiVersion">From route path</param>
        /// <returns></returns>
        [HttpPost]
        public async Task<IActionResult> PostPart([FromBody] Part newObject, ApiVersion apiVersion)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasCreateRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            Part o = await biz.CreateAsync(newObject);
            if (o == null)
                return BadRequest(new ApiErrorResponse(biz.Errors));
            else
                return CreatedAtAction(nameof(PartController.GetPart), new { id = o.Id, version = apiVersion.ToString() }, new ApiCreatedResponse(o));
        }



        /// <summary>
        /// Get Part
        /// </summary>
        /// <param name="id"></param>
        /// <returns>Part</returns>
        [HttpGet("{id}")]
        public async Task<IActionResult> GetPart([FromRoute] long id)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasReadFullRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            var o = await biz.GetAsync(id);
            if (o == null) return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
            return Ok(ApiOkResponse.Response(o));
        }

        /// <summary>
        /// Update Part
        /// </summary>        
        /// <param name="updatedObject"></param>
        /// <returns></returns>
        [HttpPut]
        public async Task<IActionResult> PutPart([FromBody] Part updatedObject)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasModifyRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            var o = await biz.PutAsync(updatedObject);
            if (o == null)
            {
                if (biz.Errors.Exists(z => z.Code == ApiErrorCode.CONCURRENCY_CONFLICT))
                    return StatusCode(409, new ApiErrorResponse(biz.Errors));
                else
                    return BadRequest(new ApiErrorResponse(biz.Errors));
            }
            return Ok(ApiOkResponse.Response(new { Concurrency = o.Concurrency })); ;
        }

        /// <summary>
        /// Delete Part
        /// </summary>
        /// <param name="id"></param>
        /// <returns>NoContent</returns>
        [HttpDelete("{id}")]
        public async Task<IActionResult> DeletePart([FromRoute] long id)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasDeleteRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            if (!await biz.DeleteAsync(id))
                return BadRequest(new ApiErrorResponse(biz.Errors));
            return NoContent();
        }



        /// <summary>
        /// Get Part serial numbers for part id
        /// </summary>
        /// <param name="id"></param>
        /// <returns>Part</returns>
        [HttpGet("serials/{id}")]
        public async Task<IActionResult> GetPartSerials([FromRoute] long id)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));

            if (!Authorized.HasReadFullRole(HttpContext.Items, AyaType.Part))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            var o = await ct.PartSerial.AsNoTracking().Where(z => z.PartId == id).OrderBy(z => z.Serial).Select(z => z.Serial).ToListAsync();
            // if (o == null) return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
            return Ok(ApiOkResponse.Response(o));
        }

        /// <summary>
        /// Update PartSerials for part
        /// </summary>        
        /// <param name="serials">array of serial numbers to replace existing array of part serials</param>
        ///<param name="id">PartId</param>
        /// <returns></returns>
        [HttpPut("serials/{id}")]
        public async Task<IActionResult> PutPartSerials([FromRoute] long id, [FromBody] List<string> serials)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasModifyRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());


            var o = await biz.PutSerialsAsync(id, serials);
            if (o == null)
            {
                if (biz.Errors.Exists(z => z.Code == ApiErrorCode.CONCURRENCY_CONFLICT))
                    return StatusCode(409, new ApiErrorResponse(biz.Errors));
                else
                    return BadRequest(new ApiErrorResponse(biz.Errors));
            }

            return Ok(ApiOkResponse.Response(o));
        }

        /// <summary>
        /// Get stock levels for part 
        /// </summary>
        /// <param name="id"></param>
        /// <returns>Array of part stock levels</returns>
        [HttpGet("stock-levels/{id}")]
        public async Task<IActionResult> GetPartStockLevels([FromRoute] long id)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));

            if (!Authorized.HasReadFullRole(HttpContext.Items, AyaType.Part))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            var o = await ct.PartStockLevel.AsNoTracking().Where(z => z.PartId == id).OrderBy(z => z.PartWarehouseId).ToListAsync();
            foreach (PartStockLevel ps in o)
            {
                ps.PartWarehouseDisplay = await ct.PartWarehouse.AsNoTracking().Where(z => z.Id == ps.PartWarehouseId).Select(z => z.Name).FirstOrDefaultAsync();
            }

            return Ok(ApiOkResponse.Response(o));
        }

        /// <summary>
        /// Update stock levels for part
        /// </summary>        
        /// <param name="partStockLevels">array of part stock levels</param>
        ///<param name="id">PartId</param>
        /// <returns></returns>
        [HttpPut("stock-levels/{id}")]
        public async Task<IActionResult> PutPartStockLevels([FromRoute] long id, [FromBody] List<PartStockLevel> partStockLevels)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasModifyRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());


            var o = await biz.PutStockLevelsAsync(id, partStockLevels);
            if (o == null)
            {
                if (biz.Errors.Exists(z => z.Code == ApiErrorCode.CONCURRENCY_CONFLICT))
                    return StatusCode(409, new ApiErrorResponse(biz.Errors));
                else
                    return BadRequest(new ApiErrorResponse(biz.Errors));
            }

            return Ok(ApiOkResponse.Response(o));
        }

        /// <summary>
        /// Update part cost for part
        /// </summary>        
        /// <param name="newCost">new cost of part</param>
        ///<param name="id">PartId</param>
        /// <returns></returns>
        [HttpPut("part-cost/{id}")]
        public async Task<IActionResult> PutPartCost([FromRoute] long id, [FromBody] decimal newCost)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasModifyRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());

            if (await biz.PutPartCostAsync(id, newCost) == false)
            {
                if (biz.Errors.Exists(z => z.Code == ApiErrorCode.CONCURRENCY_CONFLICT))
                    return StatusCode(409, new ApiErrorResponse(biz.Errors));
                else
                    return BadRequest(new ApiErrorResponse(biz.Errors));
            }
            return NoContent();
        }


        /// <summary>
        /// Get most recent Part inventory records in all warehouses for part id specified
        /// most recent is the latest "end" of the inventory chain containing the current balance as of the point in time this is fetched
        /// these values are required to make inventory adjustments
        /// </summary>
        /// <param name="partId"></param>
        /// <returns>List of part inventory records for each warehouse</returns>
        [HttpGet("latest-inventory/{partId}")]
        public async Task<IActionResult> GetLatestInventory([FromRoute] long partId)
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));

            if (!Authorized.HasReadFullRole(HttpContext.Items, AyaType.PartInventory))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));

            //get all warehouses
            var allWhs = await ct.PartWarehouse.AsNoTracking().ToListAsync();

            //iterate them and compile the last inventory for each warehouse for this part
            List<PartInventory> ret = new List<PartInventory>();
            foreach (PartWarehouse pw in allWhs)
            {
                var LastEntry = await ct.PartInventory.AsNoTracking().OrderByDescending(m => m.EntryDate).FirstOrDefaultAsync(m => m.PartId == partId && m.PartWarehouseId == pw.Id);
                if (LastEntry != null)
                {
                    ret.Add(LastEntry);
                }
            }
            return Ok(ApiOkResponse.Response(ret));
        }



        /// <summary>
        /// Get list of distinct prior units of meaasure entered
        /// </summary>       
        /// <returns>list of UOM</returns>
        [HttpGet("prior-unit-of-measure-list")]
        public async Task<IActionResult> GetPriorUnitsOfMeausre()
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            if (!Authorized.HasReadFullRole(HttpContext.Items, AyaType.Part))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            // if (!ModelState.IsValid)
            //     return BadRequest(new ApiErrorResponse(ModelState));
            var o = await ct.Part.AsNoTracking().Select(x => x.UnitOfMeasure).Where(x => x != null).Distinct().OrderBy(x => x).ToListAsync();
            if (o == null) return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
            return Ok(ApiOkResponse.Response(o));
        }

        /// <summary>
        /// Get list for accounting integrations
        /// </summary>       
        /// <returns>NameIdActiveChargeCost list</returns>
        [HttpGet("accounting-list")]
        public async Task<IActionResult> GetAccountingList()
        {
            if (!serverState.IsOpen)
                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
            PartBiz biz = PartBiz.GetBiz(ct, HttpContext);
            if (!Authorized.HasReadFullRole(HttpContext.Items, biz.BizType))
                return StatusCode(403, new ApiNotAuthorizedResponse());
            if (!ModelState.IsValid)
                return BadRequest(new ApiErrorResponse(ModelState));
            var o = await biz.GetNameIdActiveChargeCostItemsAsync();
            if (o == null) return NotFound(new ApiErrorResponse(ApiErrorCode.NOT_FOUND));
            return Ok(ApiOkResponse.Response(o));
        }
        //------------


    }//eoc
}//eons