using Api.SeaHavenIndustries.DTOs;
using Data.SeaHavenIndustries;
using FluentValidation;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using SeaHaven.Services.Interfaces;
using SeaHaven.Services.DTOs;
using System.Security.Claims;

namespace Api.SeaHavenIndustries.Controllers
{
    [Authorize]
    [ApiController]
    [Route("api/[controller]")]
    [Route("api/vendors")]
    public class VendorController : Controller
    {
        private readonly IVendorService _vendorService;
        private readonly ApplicationDbContext _db; // Keep for complex queries like nearby vendors
        private readonly Helper.ZipCodeDistance _zipDistance;
        private readonly Helper.VendorPortalTokenService _vendorTokens;
        private readonly IConfiguration _config;

        public VendorController(IVendorService vendorService, ApplicationDbContext db, Helper.ZipCodeDistance zipDistance, Helper.VendorPortalTokenService vendorTokens, IConfiguration config)
        {
            _vendorService = vendorService;
            _db = db;
            _zipDistance = zipDistance;
            _vendorTokens = vendorTokens;
            _config = config;
        }

        [HttpGet("GetVendorList")]
        public async Task<IActionResult> GetVendorList(
            string? search = "",
            int page = 1,
            int pageSize = 10,
            bool? isActive = true,
            [FromQuery] string[]? companies = null,
            [FromQuery] string[]? trades = null,
            [FromQuery] string[]? locations = null,
            [FromQuery] string[]? jobBuckets = null)
        {
            var pagedResult = await _vendorService.GetVendorsPagedAsync(
                page,
                pageSize,
                search,
                isActive,
                companies,
                trades,
                locations,
                jobBuckets);

            var data = pagedResult.Items.Select(v => new
            {
                v.Id,
                CompanyName = v.Name,
                v.CompanyId,
                v.ContactName,
                v.Email,
                v.Phone,
                v.CompanyPhone,
                v.PreferredContact,
                v.Address,
                v.City,
                v.State,
                Zip = v.Zipcode,
                v.TradeSpecialties,
                v.GoogleMapsUrl,
                v.Notes,
                v.IsActive,
                v.TotalJobs
            });

            return Ok(new Pagination_DTO
            {
                Data = data,
                PageNumber = page,
                PageSize = pageSize,
                TotalCount = pagedResult.TotalCount,
                TotalPages = (int)Math.Ceiling(pagedResult.TotalCount / (double)pageSize)
            });
        }

        [HttpGet("{id}")]
        [HttpGet("GetById")]
        public async Task<IActionResult> GetVendorById([FromRoute] int? id, [FromQuery(Name = "id")] int? queryId)
        {
            var vendorId = id ?? queryId;
            if (vendorId == null)
                return BadRequest(new Response { Status = "Error", Message = "Id is required" });

            var vendor = await _vendorService.GetVendorByIdAsync(vendorId.Value);

            if (vendor == null)
                return NotFound(new Response { Status = "Error", Message = "Vendor not found" });

            return Ok(new
            {
                vendor.Id,
                CompanyName = vendor.Name,
                vendor.CompanyId,
                vendor.ContactName,
                vendor.Email,
                vendor.Phone,
                vendor.CompanyPhone,
                vendor.PreferredContact,
                vendor.Address,
                vendor.City,
                vendor.State,
                Zip = vendor.Zipcode,
                vendor.TradeSpecialties,
                vendor.GoogleMapsUrl,
                vendor.Notes,
                vendor.IsActive,
                vendor.TotalJobs
            });
        }

        [HttpPost]
        [HttpPost("Create")]
        public async Task<IActionResult> Create([FromBody] Vendor_DTO model)
        {
            try
            {
                var createDto = new CreateVendorDTO
                {
                    Name = model.CompanyName ?? throw new ArgumentException("CompanyName is required"),
                    CompanyId = model.CompanyId,
                    ContactName = model.ContactName,
                    Email = model.Email,
                    Phone = model.Phone,
                    CompanyPhone = model.CompanyPhone,
                    PreferredContact = model.PreferredContact,
                    Address = model.Address,
                    City = model.City,
                    State = model.State,
                    Zipcode = model.Zip,
                    TradeSpecialties = model.TradeSpecialties,
                    GoogleMapsUrl = model.GoogleMapsUrl,
                    Notes = model.Notes,
                    IsActive = model.IsActive ?? true
                };

                var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
                if (userId == null)
                    return Unauthorized(new Response { Status = "Error", Message = "User not authenticated" });

                await _vendorService.CreateVendorAsync(createDto, userId);
                return Ok(new DataResponse { Message = "Vendor Created", Status = "200" });
            }
            catch (ValidationException vex)
            {
                var errors = string.Join(", ", vex.Errors.Select(e => e.ErrorMessage));
                return BadRequest(new Response { Status = "Validation Error", Message = errors });
            }
            catch (Exception ex)
            {
                return StatusCode(500, new Response { Status = "Error", Message = ex.Message });
            }
        }

        [HttpPut("{id}")]
        [HttpPost("Update")]
        public async Task<IActionResult> Update([FromRoute] int? id, [FromBody] EditVendor_DTO model)
        {
            try
            {
                // For named route, id comes from model
                int vendorId = id ?? model.Id;
                if (vendorId == 0)
                    return BadRequest(new Response { Status = "Error", Message = "Vendor Id is required" });

                var updateDto = new UpdateVendorDTO
                {
                    Name = model.CompanyName,
                    CompanyId = model.CompanyId,
                    ContactName = model.ContactName,
                    Email = model.Email,
                    Phone = model.Phone,
                    CompanyPhone = model.CompanyPhone,
                    PreferredContact = model.PreferredContact,
                    Address = model.Address,
                    City = model.City,
                    State = model.State,
                    Zipcode = model.Zip,
                    TradeSpecialties = model.TradeSpecialties,
                    GoogleMapsUrl = model.GoogleMapsUrl,
                    Notes = model.Notes,
                    IsActive = model.IsActive
                };

                var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
                if (userId == null)
                    return Unauthorized(new Response { Status = "Error", Message = "User not authenticated" });

                await _vendorService.UpdateVendorAsync(vendorId, updateDto, userId);
                return Ok(new DataResponse { Message = "Vendor Updated", Status = "200" });
            }
            catch (ValidationException vex)
            {
                var errors = string.Join(", ", vex.Errors.Select(e => e.ErrorMessage));
                return BadRequest(new Response { Status = "Validation Error", Message = errors });
            }
            catch (VendorDeactivationBlockedException dbex)
            {
                return Conflict(new
                {
                    Status = "Conflict",
                    Message = dbex.Message,
                    OpenWorkOrders = dbex.OpenWorkOrders
                });
            }
            catch (InvalidOperationException)
            {
                return NotFound(new Response { Status = "Error", Message = "Vendor not found" });
            }
            catch (Exception ex)
            {
                return StatusCode(500, new Response { Status = "Error", Message = ex.Message });
            }
        }

        [HttpDelete("{id}")]
        [HttpPost("Delete")]
        public async Task<IActionResult> Delete([FromRoute] int? id, [FromQuery(Name = "id")] int? queryId = null)
        {
            try
            {
                // Support both route parameter and query string
                int vendorId = id ?? queryId ?? 0;
                if (vendorId == 0)
                    return BadRequest(new Response { Status = "Error", Message = "Vendor Id is required" });

                var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
                if (userId == null)
                    return Unauthorized(new Response { Status = "Error", Message = "User not authenticated" });

                await _vendorService.DeleteVendorAsync(vendorId, userId);
                return Ok(new DataResponse { Message = "Vendor Deactivated", Status = "200" });
            }
            catch (VendorDeactivationBlockedException dbex)
            {
                return Conflict(new
                {
                    Status = "Conflict",
                    Message = dbex.Message,
                    OpenWorkOrders = dbex.OpenWorkOrders
                });
            }
            catch (InvalidOperationException)
            {
                return NotFound(new Response { Status = "Error", Message = "Vendor not found" });
            }
            catch (Exception ex)
            {
                return StatusCode(500, new Response { Status = "Error", Message = ex.Message });
            }
        }

        [HttpGet("{id:int}/deactivation-impact")]
        public async Task<IActionResult> GetDeactivationImpact(int id)
        {
            try
            {
                var impact = await _vendorService.GetDeactivationImpactAsync(id);
                return Ok(impact);
            }
            catch (InvalidOperationException)
            {
                return NotFound(new Response { Status = "Error", Message = "Vendor not found" });
            }
            catch (Exception ex)
            {
                return StatusCode(500, new Response { Status = "Error", Message = ex.Message });
            }
        }

        [HttpPut("{id:int}/work-order-update")]
        public async Task<IActionResult> UpdateFromWorkOrder(int id, [FromBody] WorkOrderVendorUpdate_DTO model)
        {
            try
            {
                if (model == null || model.WorkOrderId <= 0)
                    return BadRequest(new Response { Status = "Error", Message = "A valid workOrderId is required" });

                var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
                if (userId == null)
                    return Unauthorized(new Response { Status = "Error", Message = "User not authenticated" });

                var dto = new WorkOrderVendorUpdateDTO
                {
                    WorkOrderId = model.WorkOrderId,
                    ContactName = model.ContactName,
                    PreferredContact = model.PreferredContact,
                    Phone = model.Phone,
                    Email = model.Email,
                    Notes = model.Notes
                };

                var result = await _vendorService.UpdateVendorFromWorkOrderAsync(id, dto, userId);
                return Ok(result);
            }
            catch (ValidationException vex)
            {
                var errors = string.Join(", ", vex.Errors.Select(e => e.ErrorMessage));
                return BadRequest(new Response { Status = "Validation Error", Message = errors });
            }
            catch (InvalidOperationException)
            {
                return NotFound(new Response { Status = "Error", Message = "Vendor or work order link not found" });
            }
            catch (Exception ex)
            {
                return StatusCode(500, new Response { Status = "Error", Message = ex.Message });
            }
        }

        [HttpGet("Dropdown")]
        public async Task<IActionResult> GetDropdown([FromQuery] string? trade = null, [FromQuery] string? siteZip = null)
        {
            var query = _db.Vendors.Where(v => v.IsActive);

            var vendors = await query.OrderBy(v => v.CompanyName)
                .Select(v => new
                {
                    v.Id,
                    v.CompanyName,
                    v.ContactName,
                    v.PreferredContact,
                    v.TradeSpecialties,
                    v.Address,
                    v.City,
                    v.State,
                    v.Zip
                })
                .ToListAsync();

            var result = vendors.Select(v =>
            {
                var distance = _zipDistance.GetDistanceMiles(siteZip, v.Zip);
                var addr = new[] { v.Address, v.City, v.State, v.Zip }
                    .Where(s => !string.IsNullOrWhiteSpace(s));
                return new
                {
                    v.Id,
                    v.CompanyName,
                    v.ContactName,
                    v.PreferredContact,
                    v.TradeSpecialties,
                    address = string.Join(", ", addr),
                    distanceMiles = distance.HasValue ? Math.Round(distance.Value, 1) : (double?)null
                };
            }).ToList();

            if (!string.IsNullOrWhiteSpace(trade))
            {
                var tradeMatched = result.Where(v => (v.TradeSpecialties ?? "").Contains(trade)).ToList();
                var rest = result.Where(v => !(v.TradeSpecialties ?? "").Contains(trade)).ToList();
                result = tradeMatched.Concat(rest).ToList();
            }

            if (!string.IsNullOrWhiteSpace(siteZip))
            {
                result = result.OrderBy(v => v.distanceMiles ?? 99999).ToList();
            }

            return Ok(result);
        }

        [HttpGet("facets")]
        public async Task<IActionResult> GetFacets([FromQuery] bool? isActive = null)
        {
            var query = _db.Vendors
                .AsNoTracking()
                .Where(v => v.IsDeleted == null || v.IsDeleted == false);

            if (isActive.HasValue)
                query = query.Where(v => v.IsActive == isActive.Value);

            var vendors = await query
                .OrderByDescending(v => v.Id)
                .ToListAsync();

            var companies = vendors
                .Where(v => !string.IsNullOrWhiteSpace(v.CompanyName))
                .GroupBy(v => v.CompanyName!.Trim(), StringComparer.OrdinalIgnoreCase)
                .Select(group => group.First())
                .OrderBy(v => v.CompanyName)
                .Select(v => new
                {
                    Name = v.CompanyName,
                    v.CompanyId,
                    v.CompanyPhone,
                    v.Email,
                    v.PreferredContact,
                    v.Address,
                    v.City,
                    v.State,
                    Zip = v.Zip,
                    v.GoogleMapsUrl
                });

            var trades = vendors
                .SelectMany(v => (v.TradeSpecialties ?? "")
                    .Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
                .Distinct(StringComparer.OrdinalIgnoreCase)
                .OrderBy(value => value);

            var locations = vendors
                .Where(v => !string.IsNullOrWhiteSpace(v.City) || !string.IsNullOrWhiteSpace(v.State))
                .Select(v => new { v.City, v.State, Label = string.Join(", ", new[] { v.City, v.State }.Where(value => !string.IsNullOrWhiteSpace(value))) })
                .DistinctBy(location => location.Label, StringComparer.OrdinalIgnoreCase)
                .OrderBy(location => location.Label);

            return Ok(new
            {
                Companies = companies,
                Trades = trades,
                Locations = locations,
                JobBuckets = new[]
                {
                    new { Id = "under-50", Label = "Under 50" },
                    new { Id = "50-99", Label = "50–99" },
                    new { Id = "100-149", Label = "100–149" },
                    new { Id = "150-plus", Label = "150+" }
                }
            });
        }

        [HttpGet("{id:int}/portal-token")]
        public async Task<IActionResult> GetPortalToken(int id)
        {
            var vendor = await _db.Vendors.FindAsync(id);
            if (vendor == null) return NotFound();

            var token = await _vendorTokens.GetOrCreateActiveTokenAsync(id);
            return Ok(BuildPortalTokenResponse(token));
        }

        [HttpPost("{id:int}/portal-token/rotate")]
        public async Task<IActionResult> RotatePortalToken(int id)
        {
            var vendor = await _db.Vendors.FindAsync(id);
            if (vendor == null) return NotFound();

            var token = await _vendorTokens.RotateAsync(id);
            return Ok(BuildPortalTokenResponse(token));
        }

        [HttpPost("{id:int}/portal-token/revoke")]
        public async Task<IActionResult> RevokePortalToken(int id)
        {
            var vendor = await _db.Vendors.FindAsync(id);
            if (vendor == null) return NotFound();

            await _vendorTokens.RevokeAllAsync(id);
            return Ok(new { revoked = true });
        }

        private object BuildPortalTokenResponse(VendorAccessToken token)
        {
            var frontendBase = _config.GetValue<string>("FrontendBaseUrl")?.TrimEnd('/') ?? "";
            return new
            {
                token.Token,
                token.IssuedAt,
                token.ExpiresAt,
                token.LastUsedAt,
                PortalUrl = $"{frontendBase}/v/{token.Token}/dashboard"
            };
        }
    }
}