import os
import sys

# ==== Linux QGIS installation prefix ====
QGIS_PREFIX = "/usr"

# QGIS Environment
os.environ["QGIS_PREFIX_PATH"] = QGIS_PREFIX
os.environ["QGIS_HOME"] = QGIS_PREFIX

# GDAL + PROJ
os.environ["PROJ_LIB"] = "/usr/share/proj"
os.environ["GDAL_DATA"] = "/usr/share/gdal"

# QT plugin path (Umum untuk Ubuntu/Debian)
os.environ["QT_PLUGIN_PATH"] = "/usr/lib/x86_64-linux-gnu/qt5/plugins"

# Put QGIS bin into PATH
os.environ["PATH"] = "/usr/bin:" + os.environ.get("PATH", "")

# Python path milik QGIS (WAJIB ditambahkan SEBELUM import processing)
QGIS_PYTHON_PATHS = [
    "/usr/lib/python3/dist-packages",
    "/usr/lib/python3/dist-packages/qgis",
    "/usr/lib/python3/dist-packages/qgis/plugins",
    "/usr/lib/qgis",
    "/usr/lib/qgis/plugins",
    "/usr/lib/python3/dist-packages/PyQt5",
]

for p in QGIS_PYTHON_PATHS:
    if p not in sys.path:
        sys.path.insert(0, p)

# Setelah sys.path benar → Baru import QGIS & Processing
from qgis.core import QgsApplication
from qgis.analysis import QgsNativeAlgorithms
import processing
from processing.core.Processing import Processing


def start_qgis():
    qgs = QgsApplication([], False)
    qgs.initQgis()

    Processing.initialize()
    qgs.processingRegistry().addProvider(QgsNativeAlgorithms())

    return qgs