using ClosedXML.Excel;
using line_gestao_api.Data;
using line_gestao_api.Dtos;
using line_gestao_api.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System.Globalization;
using System.Text;

namespace line_gestao_api.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    //[Authorize] 
    public class LinesController : ControllerBase
    {
        private readonly AppDbContext _db;

        public LinesController(AppDbContext db)
        {
            _db = db;
        }

        public class ImportExcelForm
        {
            public IFormFile File { get; set; } = default!;
        }

        // ==========================================================
        // ✅ 1. ENDPOINT: AGRUPAR POR CLIENTE (COM BUSCA E PAGINAÇÃO)
        // ==========================================================
        // Alterado para aceitar 'search', 'page' e retornar PagedResult
        [HttpGet("groups")]
        public async Task<ActionResult<PagedResult<ClientGroupDto>>> GetClientGroups(
            [FromQuery] string? skil,
            [FromQuery] string? search, // 🔍 Busca por Nome do Cliente
            [FromQuery] int page = 1,   // 📄 Paginação
            [FromQuery] int pageSize = 10)
        {
            page = page < 1 ? 1 : page;
            pageSize = pageSize < 1 ? 10 : pageSize;

            var query = _db.MobileLines.AsNoTracking().Where(x => !string.IsNullOrEmpty(x.Cliente));

            // 1. Filtro SKIL (PF, PJ ou RESERVA)
            if (!string.IsNullOrWhiteSpace(skil))
            {
                var sSkil = skil.Trim();

                if (sSkil.Equals("RESERVA", StringComparison.OrdinalIgnoreCase))
                {
                    query = query.Where(x => x.Skil == "RESERVA" || EF.Functions.ILike(x.Skil ?? "", "%RESERVA%"));
                }
                else
                {
                    query = query.Where(x => EF.Functions.ILike(x.Skil ?? "", $"%{sSkil}%"));
                }
            }

            // 2. Filtro SEARCH (Busca pelo Nome do Cliente nos grupos)
            // Aqui garantimos que se o usuário digitar "ADR", filtramos apenas os clientes que tem ADR no nome
            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.Trim();
                query = query.Where(x => EF.Functions.ILike(x.Cliente ?? "", $"%{s}%"));
            }

            // Montagem do Agrupamento
            var groupedQuery = query
                .GroupBy(x => x.Cliente)
                .Select(g => new ClientGroupDto
                {
                    Cliente = g.Key!,
                    TotalLinhas = g.Count(),
                    Ativos = g.Count(x => EF.Functions.ILike(x.Status ?? "", "%ativo%")),
                    Bloqueados = g.Count(x => EF.Functions.ILike(x.Status ?? "", "%bloque%") ||
                                              EF.Functions.ILike(x.Status ?? "", "%perda%") ||
                                              EF.Functions.ILike(x.Status ?? "", "%roubo%"))
                });

            // Contagem total para a paginação
            var totalGroups = await groupedQuery.CountAsync();

            // Aplicação da Paginação
            var items = await groupedQuery
                .OrderBy(x => x.Cliente)
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .ToListAsync();

            // Retorna formato paginado
            return Ok(new PagedResult<ClientGroupDto>
            {
                Page = page,
                PageSize = pageSize,
                Total = totalGroups,
                Items = items
            });
        }

        // ==========================================================
        // ✅ 2. ENDPOINT: LISTAR NOMES DE CLIENTES
        // ==========================================================
        [HttpGet("clients")]
        public async Task<ActionResult<List<string>>> GetClients()
        {
            var clients = await _db.MobileLines
                .AsNoTracking()
                .Select(x => x.Cliente)
                .Where(x => !string.IsNullOrEmpty(x))
                .Distinct()
                .OrderBy(x => x)
                .ToListAsync();

            return Ok(clients);
        }

        // ==========================================================
        // ✅ 3. GET ALL (TABELA / DETALHES DO GRUPO / BUSCA ESPECÍFICA)
        // ==========================================================
        [HttpGet]
        public async Task<ActionResult<PagedResult<MobileLineListDto>>> GetAll(
            [FromQuery] string? search,
            [FromQuery] string? skil,
            [FromQuery] string? client,
            [FromQuery] int page = 1,
            [FromQuery] int pageSize = 20,
            [FromQuery] string? sortBy = "item",
            [FromQuery] string? sortDir = "asc")
        {
            page = page < 1 ? 1 : page;
            pageSize = pageSize < 1 ? 20 : pageSize;

            var q = _db.MobileLines.AsNoTracking();

            // Filtro SKIL
            if (!string.IsNullOrWhiteSpace(skil))
            {
                var sSkil = skil.Trim();
                if (sSkil.Equals("RESERVA", StringComparison.OrdinalIgnoreCase))
                    q = q.Where(x => x.Skil == "RESERVA" || EF.Functions.ILike(x.Skil ?? "", "%RESERVA%"));
                else
                    q = q.Where(x => EF.Functions.ILike(x.Skil ?? "", $"%{sSkil}%"));
            }

            // Filtro Cliente Específico (usado ao expandir o grupo)
            if (!string.IsNullOrWhiteSpace(client))
            {
                var sClient = client.Trim();
                q = q.Where(x => EF.Functions.ILike(x.Cliente ?? "", sClient));
            }

            // Busca Genérica (usada quando o frontend detecta números ou busca específica)
            if (!string.IsNullOrWhiteSpace(search))
            {
                var s = search.Trim();
                q = q.Where(x =>
                    EF.Functions.ILike(x.Linha ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.Chip ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.Cliente ?? "", $"%{s}%") || // Busca cliente aqui também caso seja modo tabela
                    EF.Functions.ILike(x.Usuario ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.Conta ?? "", $"%{s}%") ||
                    EF.Functions.ILike(x.Status ?? "", $"%{s}%"));
            }

            var total = await q.CountAsync();

            var sb = (sortBy ?? "item").Trim().ToLowerInvariant();
            var desc = string.Equals((sortDir ?? "asc").Trim(), "desc", StringComparison.OrdinalIgnoreCase);

            if (sb == "plano") sb = "planocontrato";
            if (sb == "contrato") sb = "vencconta";

            q = sb switch
            {
                "conta" => desc ? q.OrderByDescending(x => x.Conta ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Conta ?? "").ThenBy(x => x.Item),
                "linha" => desc ? q.OrderByDescending(x => x.Linha ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Linha ?? "").ThenBy(x => x.Item),
                "chip" => desc ? q.OrderByDescending(x => x.Chip ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Chip ?? "").ThenBy(x => x.Item),
                "cliente" => desc ? q.OrderByDescending(x => x.Cliente ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Cliente ?? "").ThenBy(x => x.Item),
                "usuario" => desc ? q.OrderByDescending(x => x.Usuario ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Usuario ?? "").ThenBy(x => x.Item),
                "planocontrato" => desc ? q.OrderByDescending(x => x.PlanoContrato ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.PlanoContrato ?? "").ThenBy(x => x.Item),
                "vencconta" => desc ? q.OrderByDescending(x => x.VencConta ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.VencConta ?? "").ThenBy(x => x.Item),
                "status" => desc ? q.OrderByDescending(x => x.Status ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Status ?? "").ThenBy(x => x.Item),
                "skil" => desc ? q.OrderByDescending(x => x.Skil ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Skil ?? "").ThenBy(x => x.Item),
                "modalidade" => desc ? q.OrderByDescending(x => x.Modalidade ?? "").ThenBy(x => x.Item) : q.OrderBy(x => x.Modalidade ?? "").ThenBy(x => x.Item),
                _ => desc ? q.OrderByDescending(x => x.Item) : q.OrderBy(x => x.Item)
            };

            var items = await q
                .Skip((page - 1) * pageSize)
                .Take(pageSize)
                .Select(x => new MobileLineListDto
                {
                    Id = x.Id,
                    Item = x.Item,
                    Conta = x.Conta,
                    Linha = x.Linha,
                    Chip = x.Chip,
                    Cliente = x.Cliente,
                    Usuario = x.Usuario,
                    PlanoContrato = x.PlanoContrato,
                    Status = x.Status,
                    Skil = x.Skil,
                    Modalidade = x.Modalidade,
                    VencConta = x.VencConta
                })
                .ToListAsync();

            return Ok(new PagedResult<MobileLineListDto>
            {
                Page = page,
                PageSize = pageSize,
                Total = total,
                Items = items
            });
        }

        // ==========================================================
        // DEMAIS MÉTODOS (CRUD, IMPORT, HELPERS) - MANTIDOS
        // ==========================================================
        [HttpGet("{id:guid}")] public async Task<ActionResult<MobileLineDetailDto>> GetById(Guid id) { var x = await _db.MobileLines.AsNoTracking().FirstOrDefaultAsync(a => a.Id == id); if (x == null) return NotFound(); return Ok(ToDetailDto(x)); }

        [HttpPut("{id:guid}")]
        public async Task<IActionResult> Update(Guid id, [FromBody] UpdateMobileLineRequest req)
        {
            var x = await _db.MobileLines.FirstOrDefaultAsync(a => a.Id == id);
            if (x == null) return NotFound();
            var newLinha = OnlyDigits(req.Linha);
            if (!string.IsNullOrWhiteSpace(newLinha) && !string.Equals((x.Linha ?? ""), newLinha, StringComparison.Ordinal)) { var exists = await _db.MobileLines.AsNoTracking().AnyAsync(m => m.Linha == newLinha && m.Id != id); if (exists) return Conflict(new { message = "Já existe registro com essa LINHA.", linha = newLinha }); }

            x.Item = req.Item; x.Conta = req.Conta?.Trim(); x.Linha = newLinha; x.Chip = OnlyDigits(req.Chip); x.Cliente = req.Cliente?.Trim(); x.Usuario = req.Usuario?.Trim();
            x.PlanoContrato = req.PlanoContrato?.Trim(); x.FranquiaVivo = req.FranquiaVivo; x.ValorPlanoVivo = req.ValorPlanoVivo; x.GestaoVozDados = req.GestaoVozDados;
            x.Skeelo = req.Skeelo; x.VivoNewsPlus = req.VivoNewsPlus; x.VivoTravelMundo = req.VivoTravelMundo; x.VivoGestaoDispositivo = req.VivoGestaoDispositivo;
            x.ValorContratoVivo = req.ValorContratoVivo; x.FranquiaLine = req.FranquiaLine; x.FranquiaGestao = req.FranquiaGestao; x.LocacaoAp = req.LocacaoAp;
            x.ValorContratoLine = req.ValorContratoLine; x.Desconto = req.Desconto; x.Lucro = req.Lucro; x.Status = req.Status?.Trim();
            x.DataBloqueio = ToUtc(req.DataBloqueio); x.Skil = req.Skil?.Trim(); x.Modalidade = req.Modalidade?.Trim(); x.Cedente = req.Cedente?.Trim();
            x.Solicitante = req.Solicitante?.Trim(); x.DataEntregaOpera = ToUtc(req.DataEntregaOpera); x.DataEntregaCliente = ToUtc(req.DataEntregaCliente);
            x.VencConta = req.VencConta?.Trim(); ApplyReservaRule(x); x.UpdatedAt = DateTime.UtcNow;

            try { await _db.SaveChangesAsync(); } catch (DbUpdateException) { return Conflict(new { message = "Conflito ao salvar." }); }
            return NoContent();
        }

        [HttpDelete("{id:guid}")] public async Task<IActionResult> Delete(Guid id) { var x = await _db.MobileLines.FirstOrDefaultAsync(a => a.Id == id); if (x == null) return NotFound(); _db.MobileLines.Remove(x); await _db.SaveChangesAsync(); return NoContent(); }

        [HttpPost("import-excel")]
        [Consumes("multipart/form-data")]
        [RequestSizeLimit(50_000_000)]
        public async Task<ActionResult<ImportResultDto>> ImportExcel([FromForm] ImportExcelForm form)
        {
            var file = form.File; if (file == null || file.Length == 0) return BadRequest("Arquivo inválido.");
            using var stream = file.OpenReadStream(); using var wb = new XLWorkbook(stream);
            var ws = wb.Worksheets.FirstOrDefault(w => w.Name.Trim().Equals("GERAL", StringComparison.OrdinalIgnoreCase));
            if (ws == null) return BadRequest("Aba 'GERAL' não encontrada.");
            var headerRow = ws.RowsUsed().FirstOrDefault(r => r.CellsUsed().Any(c => NormalizeHeader(c.GetString()) == "ITEM"));
            if (headerRow == null) return BadRequest("Cabeçalho 'ITEM' não encontrado.");
            var map = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
            foreach (var cell in headerRow.CellsUsed()) { var k = NormalizeHeader(cell.GetString()); if (!string.IsNullOrWhiteSpace(k) && !map.ContainsKey(k)) map[k] = cell.Address.ColumnNumber; }
            int colItem = GetCol(map, "ITEM"); if (colItem == 0) return BadRequest("Coluna 'ITEM' não encontrada.");
            var startRow = headerRow.RowNumber() + 1;
            await _db.MobileLines.ExecuteDeleteAsync();
            var buffer = new List<MobileLine>(600); var imported = 0;
            for (int r = startRow; r <= ws.LastRowUsed().RowNumber(); r++)
            {
                var itemStr = GetCellString(ws, r, colItem); if (string.IsNullOrWhiteSpace(itemStr)) break;
                var e = new MobileLine
                {
                    Item = TryInt(itemStr),
                    Conta = GetCellByHeader(ws, r, map, "CONTA"),
                    Linha = OnlyDigits(GetCellByHeader(ws, r, map, "LINHA")),
                    Chip = OnlyDigits(GetCellByHeader(ws, r, map, "CHIP")),
                    Cliente = GetCellByHeader(ws, r, map, "CLIENTE"),
                    Usuario = GetCellByHeader(ws, r, map, "USUARIO"),
                    PlanoContrato = GetCellByHeader(ws, r, map, "PLANO CONTRATO"),
                    FranquiaVivo = TryDecimal(GetCellByHeader(ws, r, map, "FRAQUIA")),
                    ValorPlanoVivo = TryDecimal(GetCellByHeader(ws, r, map, "VALOR DO PLANO R$")),
                    GestaoVozDados = TryDecimal(GetCellByHeader(ws, r, map, "GESTAO VOZ E DADOS R$")),
                    Skeelo = TryDecimal(GetCellByHeader(ws, r, map, "SKEELO")),
                    VivoNewsPlus = TryDecimal(GetCellByHeader(ws, r, map, "VIVO NEWS PLUS")),
                    VivoTravelMundo = TryDecimal(GetCellByHeader(ws, r, map, "VIVO TRAVEL MUNDO")),
                    VivoGestaoDispositivo = TryDecimal(GetCellByHeader(ws, r, map, "VIVO GESTAO DISPOSITIVO")),
                    ValorContratoVivo = TryDecimal(GetCellByHeader(ws, r, map, "VALOR CONTRATO VIVO")),
                    FranquiaLine = TryDecimal(GetCellByHeader(ws, r, map, "FRANQUIA LINE")),
                    FranquiaGestao = TryDecimal(GetCellByHeader(ws, r, map, "FRANQUIA GESTAO")),
                    LocacaoAp = TryDecimal(GetCellByHeader(ws, r, map, "LOCACAO AP.")),
                    ValorContratoLine = TryDecimal(GetCellByHeader(ws, r, map, "VALOR CONTRATO LINE")),
                    Desconto = TryDecimal(GetCellByHeader(ws, r, map, "DESCONTO")),
                    Lucro = TryDecimal(GetCellByHeader(ws, r, map, "LUCRO")),
                    Status = GetCellByHeader(ws, r, map, "STATUS"),
                    DataBloqueio = TryDate(ws, r, map, "DATA DO BLOQUEIO"),
                    Skil = GetCellByHeader(ws, r, map, "SKIL"),
                    Modalidade = GetCellByHeader(ws, r, map, "MODALIDADE"),
                    Cedente = GetCellByHeader(ws, r, map, "CEDENTE"),
                    Solicitante = GetCellByHeader(ws, r, map, "SOLICITANTE"),
                    DataEntregaOpera = TryDate(ws, r, map, "DATA DA ENTREGA OPERA."),
                    DataEntregaCliente = TryDate(ws, r, map, "DATA DA ENTREGA CLIENTE"),
                    VencConta = GetCellByHeader(ws, r, map, "VENC. DA CONTA")
                };
                ApplyReservaRule(e); buffer.Add(e); imported++;
                if (buffer.Count >= 500) { await _db.MobileLines.AddRangeAsync(buffer); await _db.SaveChangesAsync(); buffer.Clear(); }
            }
            if (buffer.Count > 0) { await _db.MobileLines.AddRangeAsync(buffer); await _db.SaveChangesAsync(); }
            return Ok(new ImportResultDto { Imported = imported });
        }

        // Helpers
        private static DateTime? ToUtc(DateTime? dt) { if (dt == null) return null; var v = dt.Value; return v.Kind == DateTimeKind.Utc ? v : (v.Kind == DateTimeKind.Local ? v.ToUniversalTime() : DateTime.SpecifyKind(v, DateTimeKind.Utc)); }
        private static MobileLineDetailDto ToDetailDto(MobileLine x) => new() { Id = x.Id, Item = x.Item, Conta = x.Conta, Linha = x.Linha, Chip = x.Chip, Cliente = x.Cliente, Usuario = x.Usuario, PlanoContrato = x.PlanoContrato, FranquiaVivo = x.FranquiaVivo, ValorPlanoVivo = x.ValorPlanoVivo, GestaoVozDados = x.GestaoVozDados, Skeelo = x.Skeelo, VivoNewsPlus = x.VivoNewsPlus, VivoTravelMundo = x.VivoTravelMundo, VivoGestaoDispositivo = x.VivoGestaoDispositivo, ValorContratoVivo = x.ValorContratoVivo, FranquiaLine = x.FranquiaLine, FranquiaGestao = x.FranquiaGestao, LocacaoAp = x.LocacaoAp, ValorContratoLine = x.ValorContratoLine, Desconto = x.Desconto, Lucro = x.Lucro, Status = x.Status, DataBloqueio = x.DataBloqueio, Skil = x.Skil, Modalidade = x.Modalidade, Cedente = x.Cedente, Solicitante = x.Solicitante, DataEntregaOpera = x.DataEntregaOpera, DataEntregaCliente = x.DataEntregaCliente, VencConta = x.VencConta };
        private static void ApplyReservaRule(MobileLine x) { if ((x.Cliente ?? "").Trim().ToUpper() == "RESERVA" || (x.Usuario ?? "").Trim().ToUpper() == "RESERVA") { x.Cliente = "RESERVA"; x.Usuario = "RESERVA"; x.Skil = "RESERVA"; } }
        private static int GetCol(Dictionary<string, int> map, string name) => map.TryGetValue(NormalizeHeader(name), out var c) ? c : 0;
        private static string GetCellByHeader(IXLWorksheet ws, int row, Dictionary<string, int> map, string header) { var k = NormalizeHeader(header); return map.TryGetValue(k, out var c) ? GetCellString(ws, row, c) : ""; }
        private static string GetCellString(IXLWorksheet ws, int row, int col) { var c = ws.Cell(row, col); return c == null ? "" : (c.GetValue<string>() ?? "").Trim(); }
        private static DateTime? TryDate(IXLWorksheet ws, int row, Dictionary<string, int> map, string header) { var k = NormalizeHeader(header); if (!map.TryGetValue(k, out var c)) return null; var cell = ws.Cell(row, c); if (cell.DataType == XLDataType.DateTime) return ToUtc(cell.GetDateTime()); var s = cell.GetValue<string>()?.Trim(); if (string.IsNullOrWhiteSpace(s)) return null; if (DateTime.TryParse(s, new CultureInfo("pt-BR"), DateTimeStyles.None, out var d)) return ToUtc(d); return null; }
        private static decimal? TryDecimal(string? s) { if (string.IsNullOrWhiteSpace(s)) return null; s = s.Replace("R$", "").Trim(); if (decimal.TryParse(s, NumberStyles.Any, new CultureInfo("pt-BR"), out var d)) return d; if (decimal.TryParse(s, NumberStyles.Any, CultureInfo.InvariantCulture, out d)) return d; return null; }
        private static int TryInt(string s) => int.TryParse(OnlyDigits(s), out var n) ? n : 0;
        private static string OnlyDigits(string? s) { if (string.IsNullOrWhiteSpace(s)) return ""; var sb = new StringBuilder(); foreach (var c in s) if (char.IsDigit(c)) sb.Append(c); return sb.ToString(); }
        private static string NormalizeHeader(string? s) { if (string.IsNullOrWhiteSpace(s)) return ""; s = s.Trim().ToUpperInvariant().Normalize(NormalizationForm.FormD); var sb = new StringBuilder(); foreach (var c in s) if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark) sb.Append(c); return sb.ToString().Normalize(NormalizationForm.FormC).Replace("ITEM", "ITEM").Replace("USUARIO", "USUARIO").Replace("GESTAO", "GESTAO").Replace("LOCACAO", "LOCACAO").Replace(" ", ""); }
    }
}