import prisma from '../utils/db';
import { catatAudit } from '../utils/audit';
import { generateKodeShift } from '../utils/kodeGenerator';
import { APIError } from '../utils/errors';
import fs from 'fs';
import path from 'path';
import PDFDocument from 'pdfkit';
import { uploadBufferToSupabase } from '../utils/supabase';

export class OpsService {
  static async getActiveShift(userId: number) {
    return await prisma.shift.findFirst({
      where: {
        user_id: userId,
        status: 'buka',
      },
    });
  }

  static async bukaShift(modalAwal: number, catatan: string | null, actorId: number, ip: string, userAgent: string) {
    const existing = await this.getActiveShift(actorId);
    if (existing) {
      throw new APIError(`Anda sudah memiliki shift yang aktif (${existing.kode}). Tutup terlebih dahulu.`, 400);
    }

    const kode = await generateKodeShift();

    const shift = await prisma.shift.create({
      data: {
        user_id: actorId,
        kode: kode,
        modal_awal: modalAwal,
        waktu_buka: new Date(),
        status: 'buka',
        catatan: catatan,
      },
    });

    await catatAudit({
      userId: actorId,
      aksi: 'update',
      entitas: 'shift',
      entitasId: shift.id,
      dataBaru: { kode, modal_awal: modalAwal },
      ipAddress: ip,
      userAgent,
    });

    return shift;
  }

  static async tutupShift(modalAkhirFisik: number, catatan: string | null, actorId: number, ip: string, userAgent: string) {
    const shift = await this.getActiveShift(actorId);
    if (!shift) {
      throw new APIError('Tidak ada shift aktif yang dapat ditutup.', 400);
    }

    const saldoSistem = Number(shift.modal_awal) + Number(shift.total_tunai);
    const selisih = modalAkhirFisik - saldoSistem;

    let newCatatan = shift.catatan || '';
    if (catatan) {
      newCatatan = `${newCatatan} | Penutupan: ${catatan}`.trim().replace(/^ \| /, '');
    }

    const updated = await prisma.shift.update({
      where: { id: shift.id },
      data: {
        total_selisih: selisih,
        waktu_tutup: new Date(),
        status: 'tutup',
        catatan: newCatatan,
      },
    });

    // Buat notifikasi
    const selisihRupiah = Math.floor(selisih).toLocaleString('id-ID').replace(/,/g, '.');
    const pesanNotif = `Kasir (User ID ${actorId}) telah menutup shift ${shift.kode}. Modal Awal: Rp ${Number(shift.modal_awal).toLocaleString('id-ID')}. Selisih Kas Fisik vs Sistem: Rp ${selisihRupiah}.`;

    await prisma.notifikasi.create({
      data: {
        tipe: 'shift_tutup',
        judul: `Shift Ditutup: ${shift.kode}`,
        pesan: pesanNotif,
        referensi_id: shift.id,
      },
    });

    await catatAudit({
      userId: actorId,
      aksi: 'update',
      entitas: 'shift',
      entitasId: shift.id,
      dataLama: { status: 'buka' },
      dataBaru: { status: 'tutup', total_selisih: selisih, fisik: modalAkhirFisik },
      ipAddress: ip,
      userAgent,
    });

    return updated;
  }

  // Settings
  static async getSettings() {
    return await prisma.pengaturan.findMany();
  }

  static async getSettingByKey(key: string) {
    const setting = await prisma.pengaturan.findUnique({
      where: { kunci: key },
    });
    if (!setting) {
      throw new APIError(`Pengaturan '${key}' tidak ditemukan`, 404);
    }
    return setting.nilai;
  }

  static async updateSetting(key: string, data: any, actorId: number, ip: string, userAgent: string) {
    const existing = await prisma.pengaturan.findUnique({
      where: { kunci: key },
    });

    const dataLama = existing ? { nilai: existing.nilai } : null;

    const setting = await prisma.pengaturan.upsert({
      where: { kunci: key },
      create: {
        kunci: key,
        nilai: data.nilai,
        deskripsi: data.deskripsi ?? null,
      },
      update: {
        nilai: data.nilai,
        deskripsi: data.deskripsi !== undefined ? data.deskripsi : undefined,
      },
    });

    await catatAudit({
      userId: actorId,
      aksi: 'update',
      entitas: 'pengaturan',
      entitasId: setting.id,
      dataLama,
      dataBaru: { nilai: data.nilai },
      ipAddress: ip,
      userAgent,
    });

    return setting;
  }

  // Notifikasi
  static async getNotifications(skip = 0, limit = 20, isDibaca?: number) {
    const where: any = {};
    if (isDibaca !== undefined) {
      where.is_dibaca = isDibaca;
    }

    return await prisma.notifikasi.findMany({
      where,
      orderBy: { created_at: 'desc' },
      skip,
      take: limit,
    });
  }

  static async markAllNotifAsRead() {
    const result = await prisma.notifikasi.updateMany({
      where: { is_dibaca: 0 },
      data: { is_dibaca: 1 },
    });
    return result.count;
  }

  static async markNotifAsRead(id: number) {
    const notif = await prisma.notifikasi.findUnique({ where: { id } });
    if (!notif) {
      throw new APIError('Notifikasi tidak ditemukan', 404);
    }

    return await prisma.notifikasi.update({
      where: { id },
      data: { is_dibaca: 1 },
    });
  }

  static async getUnreadNotifCount() {
    return await prisma.notifikasi.count({
      where: { is_dibaca: 0 },
    });
  }

  // Dashboard Reports
  static async getDashboardSummary() {
    const today = new Date();
    today.setHours(0, 0, 0, 0);
    const tomorrow = new Date(today);
    tomorrow.setDate(tomorrow.getDate() + 1);

    // 1. Total Penjualan Hari Ini
    const sumResult = await prisma.transaksi.aggregate({
      where: {
        tanggal: { gte: today, lt: tomorrow },
        status: { not: 'void' },
      },
      _sum: { total: true },
    });
    const penjualanHariIni = Number(sumResult._sum.total ?? 0);

    // 2. Total Transaksi Hari Ini
    const jumlahTransaksiHariIni = await prisma.transaksi.count({
      where: {
        tanggal: { gte: today, lt: tomorrow },
        status: { not: 'void' },
      },
    });

    // 3. Total Produk Terdaftar
    const totalProduk = await prisma.produk.count({
      where: { deleted_at: null },
    });

    // 4. Produk Stok Rendah
    const products = await prisma.produk.findMany({
      where: { deleted_at: null },
    });
    const stokRendah = products.filter((p) => Number(p.stok) <= Number(p.stok_min)).length;

    // 5. Total Piutang
    const sumPiutang = await prisma.member.aggregate({
      where: { aktif: 1 },
      _sum: { total_bon: true },
    });
    const totalPiutang = Number(sumPiutang._sum.total_bon ?? 0);

    // 6. Grafik penjualan 7 hari terakhir
    const grafik7Hari: any[] = [];
    const todayForGraph = new Date();
    todayForGraph.setHours(0, 0, 0, 0);

    for (let i = 6; i >= 0; i--) {
      const targetDay = new Date(todayForGraph);
      targetDay.setDate(targetDay.getDate() - i);
      const nextDay = new Date(targetDay);
      nextDay.setDate(nextDay.getDate() + 1);

      const daySum = await prisma.transaksi.aggregate({
        where: {
          tanggal: { gte: targetDay, lt: nextDay },
          status: { not: 'void' },
        },
        _sum: { total: true },
      });

      const dayStr = `${String(targetDay.getDate()).padStart(2, '0')}/${String(targetDay.getMonth() + 1).padStart(2, '0')}`;
      grafik7Hari.push({
        tanggal: dayStr,
        nominal: Number(daySum._sum.total ?? 0),
      });
    }

    // 7. Top 5 Produk Terlaris (7 hari terakhir)
    const tujuhHariLalu = new Date();
    tujuhHariLalu.setDate(tujuhHariLalu.getDate() - 7);
    tujuhHariLalu.setHours(0, 0, 0, 0);

    const terlarisRaw = await prisma.$queryRaw<any[]>`
      SELECT td.nama_produk as nama, SUM(td.qty) as terjual
      FROM transaksi_detail td
      JOIN transaksi t ON t.id = td.transaksi_id
      WHERE t.deleted_at IS NULL AND t.status != 'void' AND t.tanggal >= ${tujuhHariLalu}
      GROUP BY td.produk_id, td.nama_produk
      ORDER BY terjual DESC
      LIMIT 5
    `;

    const produkTerlaris = terlarisRaw.map((p) => ({
      nama: p.nama,
      terjual: Number(p.terjual),
    }));

    // 8. Bon Jatuh Tempo Aktif
    const bonJatuhTempoRaw = await prisma.bon.findMany({
      where: { status: 'aktif' },
      include: { member: { select: { nama: true } } },
      orderBy: { jatuh_tempo: 'asc' },
      take: 5,
    });

    const bonJatuhTempo = bonJatuhTempoRaw.map((b) => ({
      nama: b.member.nama,
      nominal: Number(b.sisa_bon),
      jatuhTempo: b.jatuh_tempo ? b.jatuh_tempo.toISOString().split('T')[0] : '',
      status: b.status,
    }));

    return {
      penjualan_hari_ini: penjualanHariIni,
      jumlah_transaksi_hari_ini: jumlahTransaksiHariIni,
      total_produk: totalProduk,
      stok_rendah: stokRendah,
      total_piutang: totalPiutang,
      grafik_penjualan_7_hari: grafik7Hari,
      produk_terlaris: produkTerlaris,
      bon_jatuh_tempo: bonJatuhTempo,
    };
  }

  static async buatLaporanPenjualan(tglMulai: Date, tglSelesai: Date) {
    const endOfDay = new Date(tglSelesai);
    endOfDay.setHours(23, 59, 59, 999);

    const transaksiList = await prisma.transaksi.findMany({
      where: {
        tanggal: { gte: tglMulai, lte: endOfDay },
        status: { not: 'void' },
      },
      include: {
        pembayaran: true,
      },
    });

    let totalOmset = 0;
    let totalDiskon = 0;
    const metodePembayaranSummary: Record<string, number> = {
      tunai: 0,
      qris: 0,
      transfer: 0,
      bon: 0,
      voucher: 0,
    };

    for (const t of transaksiList) {
      totalOmset += Number(t.total);
      totalDiskon += Number(t.diskon_total);
      for (const p of t.pembayaran) {
        if (metodePembayaranSummary[p.metode] !== undefined) {
          metodePembayaranSummary[p.metode] += Number(p.nominal);
        }
      }
    }

    const kontribusiPersen: Record<string, number> = {};
    for (const k in metodePembayaranSummary) {
      if (totalOmset > 0) {
        kontribusiPersen[k] = Number(((metodePembayaranSummary[k] / totalOmset) * 100).toFixed(2));
      } else {
        kontribusiPersen[k] = 0;
      }
    }

    return {
      periode: {
        mulai: tglMulai.toISOString().slice(0, 10),
        selesai: tglSelesai.toISOString().slice(0, 10),
      },
      total_transaksi: transaksiList.length,
      total_omset: totalOmset,
      total_diskon: totalDiskon,
      metode_pembayaran: metodePembayaranSummary,
      kontribusi_pembayaran_persen: kontribusiPersen,
    };
  }

  static async buatLaporanLabaRugi(tglMulai: Date, tglSelesai: Date) {
    const endOfDay = new Date(tglSelesai);
    endOfDay.setHours(23, 59, 59, 999);

    const sumResult = await prisma.transaksi.aggregate({
      where: {
        tanggal: { gte: tglMulai, lte: endOfDay },
        status: { not: 'void' },
      },
      _sum: { total: true },
    });
    const omset = Number(sumResult._sum.total ?? 0);

    const detailList = await prisma.transaksi_detail.findMany({
      where: {
        transaksi: {
          tanggal: { gte: tglMulai, lte: endOfDay },
          status: { not: 'void' },
        },
      },
      include: {
        produk: true,
      },
    });

    const hpp = detailList.reduce((acc, detail) => {
      const hargaBeli = Number(detail.produk?.harga_beli ?? detail.harga_satuan);
      return acc + Number(detail.qty) * hargaBeli;
    }, 0);

    const labaKotor = omset - hpp;
    const marginLaba = omset > 0 ? Number(((labaKotor / omset) * 100).toFixed(2)) : 0;

    return {
      periode: {
        mulai: tglMulai.toISOString().slice(0, 10),
        selesai: tglSelesai.toISOString().slice(0, 10),
      },
      pendapatan_omset: omset,
      harga_pokok_penjualan: hpp,
      laba_kotor: labaKotor,
      margin_laba_persen: marginLaba,
    };
  }

  static async eksporLaporan(params: {
    jenis: 'penjualan' | 'laba-rugi' | 'mutasi-stok';
    format: 'csv' | 'excel' | 'pdf';
    tglMulai: Date;
    tglSelesai: Date;
  }): Promise<{ filename: string; url: string }> {
    const { jenis, format, tglMulai, tglSelesai } = params;
    const endOfDay = new Date(tglSelesai);
    endOfDay.setHours(23, 59, 59, 999);

    const timestamp = Date.now();
    const ext = format === 'pdf' ? 'pdf' : 'csv';
    const filename = `laporan_${jenis}_${timestamp}.${ext}`;
    const filePath = path.join(__dirname, '../public/exports', filename);

    // Pastikan folder exports ada sebelum menulis berkas
    const exportDir = path.dirname(filePath);
    if (!fs.existsSync(exportDir)) {
      fs.mkdirSync(exportDir, { recursive: true });
    }

    if (ext === 'csv') {
      let content = '';
      if (jenis === 'penjualan') {
        const data = await prisma.transaksi.findMany({
          where: { tanggal: { gte: tglMulai, lte: endOfDay }, deleted_at: null },
          include: { pembayaran: true, user: { select: { nama: true } } },
          orderBy: { tanggal: 'asc' },
        });

        content = 'No. Invoice;Tanggal;Waktu;Kasir;Total;Diskon;Kembalian;Status;Metode Pembayaran\n';
        data.forEach((tx) => {
          const metode = tx.pembayaran.map((p) => p.metode).join(', ');
          content += `${tx.no_transaksi};${new Date(tx.tanggal).toISOString().split('T')[0]};${tx.waktu || ''};${tx.user?.nama || ''};${Number(tx.total)};${Number(tx.diskon_total)};${Number(tx.kembalian)};${tx.status};${metode}\n`;
        });
      } else if (jenis === 'laba-rugi') {
        const details = await prisma.transaksi_detail.findMany({
          where: { transaksi: { tanggal: { gte: tglMulai, lte: endOfDay }, deleted_at: null, status: { not: 'void' } } },
          include: { produk: true, transaksi: true },
        });

        content = 'No. Invoice;Tanggal;Produk;Qty;Harga Satuan;Subtotal;Harga Beli (HPP);Laba Kotor\n';
        details.forEach((d) => {
          const hpp = Number(d.produk?.harga_beli ?? d.harga_satuan);
          const laba = Number(d.subtotal) - (hpp * Number(d.qty));
          content += `${d.transaksi.no_transaksi};${new Date(d.transaksi.tanggal).toISOString().split('T')[0]};${d.nama_produk};${Number(d.qty)};${Number(d.harga_satuan)};${Number(d.subtotal)};${hpp * Number(d.qty)};${laba}\n`;
        });
      } else if (jenis === 'mutasi-stok') {
        const logs = await prisma.stok_log.findMany({
          where: { created_at: { gte: tglMulai, lte: endOfDay } },
          include: { produk: true, user: { select: { nama: true } } },
          orderBy: { created_at: 'desc' },
        });

        content = 'Tanggal;Produk;Tipe Mutasi;Qty;Stok Sebelum;Stok Sesudah;Kasir;Catatan\n';
        logs.forEach((log) => {
          content += `${new Date(log.created_at).toISOString().replace('T', ' ').substring(0, 19)};${log.produk.nama};${log.tipe};${Number(log.qty)};${Number(log.stok_sebelum)};${Number(log.stok_sesudah)};${log.user?.nama || ''};${log.catatan || ''}\n`;
        });
      }
      fs.writeFileSync(filePath, content, 'utf-8');
    } else {
      // PDF format menggunakan pdfkit
      const doc = new PDFDocument({ margin: 30 });
      const stream = fs.createWriteStream(filePath);
      doc.pipe(stream);

      // Header PDF
      doc.fontSize(18).text('TOKIVA POINT OF SALE', { align: 'center' });
      doc.fontSize(12).text(`Laporan ${jenis.toUpperCase().replace('-', ' ')}`, { align: 'center' });
      doc.fontSize(9).text(`Periode: ${tglMulai.toISOString().split('T')[0]} s/d ${tglSelesai.toISOString().split('T')[0]}`, { align: 'center' });
      doc.moveDown(1.5);

      if (jenis === 'penjualan') {
        const data = await prisma.transaksi.findMany({
          where: { tanggal: { gte: tglMulai, lte: endOfDay }, deleted_at: null },
          include: { user: { select: { nama: true } } },
          orderBy: { tanggal: 'asc' },
        });

        doc.fontSize(10).text('Daftar Transaksi:', { underline: true });
        doc.moveDown(0.5);
        let totalOmset = 0;

        data.forEach((tx, idx) => {
          totalOmset += Number(tx.total);
          doc.fontSize(9).text(`${idx + 1}. Invoice: ${tx.no_transaksi} | Tanggal: ${new Date(tx.tanggal).toISOString().split('T')[0]} | Kasir: ${tx.user?.nama || '-'} | Total: Rp ${Number(tx.total).toLocaleString('id-ID')} (${tx.status})`);
        });

        doc.moveDown(1);
        doc.font('Helvetica-Bold').fontSize(11).text(`TOTAL OMZET: Rp ${totalOmset.toLocaleString('id-ID')}`);
        doc.font('Helvetica');
      } else if (jenis === 'laba-rugi') {
        const details = await prisma.transaksi_detail.findMany({
          where: { transaksi: { tanggal: { gte: tglMulai, lte: endOfDay }, deleted_at: null, status: { not: 'void' } } },
          include: { produk: true },
        });

        let totalOmset = 0;
        let totalHpp = 0;

        details.forEach((d) => {
          totalOmset += Number(d.subtotal);
          const hppVal = Number(d.produk?.harga_beli ?? d.harga_satuan) * Number(d.qty);
          totalHpp += hppVal;
        });

        const labaKotor = totalOmset - totalHpp;
        const margin = totalOmset > 0 ? (labaKotor / totalOmset) * 100 : 0;

        doc.fontSize(10).text('Ringkasan Laba Rugi:', { underline: true });
        doc.moveDown(0.5);
        doc.fontSize(9).text(`Total Omzet Penjualan: Rp ${totalOmset.toLocaleString('id-ID')}`);
        doc.fontSize(9).text(`Total Harga Pokok Penjualan (HPP): Rp ${totalHpp.toLocaleString('id-ID')}`);
        doc.moveDown(0.5);
        doc.font('Helvetica-Bold').fontSize(11).text(`LABA KOTOR: Rp ${labaKotor.toLocaleString('id-ID')}`);
        doc.font('Helvetica');
        doc.fontSize(9).text(`Margin Laba: ${margin.toFixed(2)}%`);
      } else if (jenis === 'mutasi-stok') {
        const logs = await prisma.stok_log.findMany({
          where: { created_at: { gte: tglMulai, lte: endOfDay } },
          include: { produk: true },
          orderBy: { created_at: 'desc' },
        });

        doc.fontSize(10).text('Mutasi Stok Barang:', { underline: true });
        doc.moveDown(0.5);

        logs.forEach((log, idx) => {
          doc.fontSize(8).text(`${idx + 1}. [${new Date(log.created_at).toISOString().replace('T', ' ').substring(0, 19)}] ${log.produk.nama} | Tipe: ${log.tipe} | Qty: ${Number(log.qty)} | Stok: ${Number(log.stok_sebelum)} -> ${Number(log.stok_sesudah)} | Catatan: ${log.catatan || '-'}`);
        });
      }

      doc.end();

      // Tunggu stream selesai menulis file ke disk
      await new Promise<void>((resolve) => stream.on('finish', () => resolve()));
    }

    // Upload ke Supabase Storage
    let fileBuffer: Buffer | null = null;
    try {
      fileBuffer = fs.readFileSync(filePath);
    } catch (readErr) {
      console.error('Gagal membaca file laporan:', readErr);
    }

    let downloadUrl = '';
    if (fileBuffer) {
      const mimeType = format === 'pdf' ? 'application/pdf' : 'text/csv';
      const supabaseUrl = await uploadBufferToSupabase('exports', filename, fileBuffer, mimeType);
      if (supabaseUrl) {
        downloadUrl = supabaseUrl;
      }
    }

    if (!downloadUrl) {
      const host = process.env.BACKEND_URL || 'http://localhost:5000';
      downloadUrl = `${host}/exports/${filename}`;
    }

    return {
      filename,
      url: downloadUrl,
    };
  }
}