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_jakom_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)

    FONT_HELVETICA = os.path.join(FONT_DIR, "Helvetica.ttf")
    pdfmetrics.registerFont(TTFont("Helvetica", FONT_HELVETICA))
    
    # --- Data ---
    nama = data["nama"]
    alamat1 = data["alamat1"]
    
    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(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) 
    # format April 2025
    periode_awal_str = f"{bulan_indo[awal.month]}  {awal.year}"
    periode = periode_awal_str 

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

    # --- Draw ke PDF ---
    c.setFont("Helvetica", 10)
    c.setFillColor(HexColor("#ff3300"))
    c.drawString(20, 724, nama)      
    c.drawString(20, 683, alamat1)   
    
    # periode draw right
    c.drawRightString(574, 683, periode)

    c.setFillColor(HexColor("#000000"))
    c.drawString(528, 623, halaman)
    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)