from reportlab.pdfgen import canvas
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
from PyPDF2 import PdfReader, PdfWriter
from datetime import datetime, timedelta
import random
import os
import uuid

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
FONT_DIR = os.path.join(BASE_DIR, "../assets/fonts")


def generate_jenius_pdf(data, template_path, output_path):
    from reportlab.lib.colors import HexColor
    TEMP_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "../static/tmp")
    os.makedirs(TEMP_DIR, exist_ok=True)

    packet_path = os.path.join(TEMP_DIR, f"temp_overlay_{uuid.uuid4().hex}.pdf")

    c = canvas.Canvas(packet_path)

    # Roboto-Medium
    FONT_ROBOTO_MEDIUM = os.path.join(FONT_DIR, "roboto-medium2.ttf")
    # Roboto-Bold
    FONT_ROBOTO_BOLD = os.path.join(FONT_DIR, "Roboto-Bold.ttf")
    
    pdfmetrics.registerFont(TTFont("Roboto-Medium", FONT_ROBOTO_MEDIUM))
    pdfmetrics.registerFont(TTFont("Roboto-Bold", FONT_ROBOTO_BOLD))

    # --- Data ---
    nama = data["nama"]
    cashtag = data["cashtag"]
    
    bulan_indo = [
        "", "Januari", "Februari", "Maret", "April", "Mei", "Juni",
        "Juli", "Agustus", "September", "Oktober", "November", "Desember"
    ]
    # Tanggal random dari 3 bulan ke belakang
    now = datetime.now()
    # List 3 bulan ke belakang (misal: Juli 2025 -> [4, 5, 6] = April, Mei, Juni)
    bulan_list = [(now.month - i - 1) % 12 + 1 for i in range(3)]
    tahun_list = [now.year if now.month - i - 1 >= 0 else now.year - 1 for i in range(3)]

    bulan_list = [(now.month - i - 1) % 12 + 1 for i in range(1, 4)]
    tahun_list = [now.year if now.month - i - 1 >= 0 else now.year - 1 for i in range(1, 4)]
    print("Bulan List:", bulan_list)

    # Pilih salah satu bulan dan tahun secara acak
    idx = random.randint(0, 2)
    bulan_target = bulan_list[idx]
    tahun_target = tahun_list[idx]

    awal = datetime(tahun_target, bulan_target, 1)

    periode_awal_str = f"{bulan_indo[awal.month]} {awal.year}"
    periode = periode_awal_str

    halaman = f"{random.randint(2, 9)}"

    total = f"{random.randint(1_000_000, 5_000_000):,}".replace(",", ".") + ""

    # norek random 11 digit, diawal selain 0
    norek = ''.join(random.choices('123456789', k=1) + random.choices('0123456789', k=10))

    # --- Draw ke PDF ---
    c.setFont("Roboto-Medium", 8)
    c.setFont("Roboto-Bold", 7.9)

    c.setFillColor(HexColor("#585858"))
    c.drawString(41, 759, nama)
    c.drawString(41, 735, norek)

    c.drawString(41, 715, cashtag)

    c.setFont("Roboto-Medium", 6)
    c.drawRightString(562, 791, "1 dari " + halaman)
    c.setFont("Roboto-Bold", 7.9)
    c.setFillColor(HexColor("#00a4de"))
    c.drawRightString(555, 758, 'Rp ' + total)

    c.setFillColor(HexColor("#585858"))
    c.drawRightString(555, 734, periode)
    
    c.save()

    background = PdfReader(template_path)
    overlay = PdfReader(packet_path)
    writer = PdfWriter()

    page = background.pages[0]
    page.merge_page(overlay.pages[0])
    writer.add_page(page)

    with open(output_path, "wb") as f:
        writer.write(f)

    # Bersihkan file sementara
    if os.path.exists(packet_path):
        os.remove(packet_path)