"""
***************************************************************************
    DefineProjection.py
    ---------------------
    Date                 : January 2016
    Copyright            : (C) 2016 by Alexander Bruy
    Email                : alexander dot bruy at gmail dot com
***************************************************************************
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
***************************************************************************
"""

__author__ = "Alexander Bruy"
__date__ = "January 2016"
__copyright__ = "(C) 2016, Alexander Bruy"

import os
import re

from qgis.core import (
    QgsProcessing,
    QgsProcessingAlgorithm,
    QgsProcessingParameterVectorLayer,
    QgsProcessingParameterCrs,
    QgsProcessingOutputVectorLayer,
    QgsCoordinateReferenceSystem,
    QgsProjUtils,
)

from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm

pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]


class DefineProjection(QgisAlgorithm):
    INPUT = "INPUT"
    CRS = "CRS"

    def group(self):
        return self.tr("Vector general")

    def groupId(self):
        return "vectorgeneral"

    def __init__(self):
        super().__init__()

    def initAlgorithm(self, config=None):
        self.addParameter(
            QgsProcessingParameterVectorLayer(
                self.INPUT,
                self.tr("Input Shapefile"),
                types=[QgsProcessing.SourceType.TypeVectorAnyGeometry],
            )
        )
        self.addParameter(QgsProcessingParameterCrs(self.CRS, "CRS", "EPSG:4326"))
        self.addOutput(
            QgsProcessingOutputVectorLayer(self.INPUT, self.tr("Layer with projection"))
        )

    def name(self):
        return "definecurrentprojection"

    def displayName(self):
        return self.tr("Define Shapefile projection")

    def tags(self):
        return self.tr("layer,shp,prj,qpj,change,alter").split(",")

    def shortDescription(self):
        return self.tr(
            "Changes a Shapefile's projection to a new CRS without reprojecting features"
        )

    def flags(self):
        return super().flags() | QgsProcessingAlgorithm.Flag.FlagNoThreading

    def processAlgorithm(self, parameters, context, feedback):
        layer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
        crs = self.parameterAsCrs(parameters, self.CRS, context)

        provider = layer.dataProvider()
        ds = provider.dataSourceUri()
        p = re.compile(r"\|.*")
        dsPath = p.sub("", ds)

        if dsPath.lower().endswith(".shp"):
            dsPath = dsPath[:-4]

            wkt = crs.toWkt(QgsCoordinateReferenceSystem.WktVariant.WKT1_ESRI)
            with open(dsPath + ".prj", "w", encoding="utf-8") as f:
                f.write(wkt)

            qpjFile = dsPath + ".qpj"
            if os.path.exists(qpjFile):
                os.remove(qpjFile)
        else:
            feedback.pushConsoleInfo(
                self.tr("Data source isn't a Shapefile, skipping .prj/.qpj creation")
            )

        layer.setCrs(crs)
        layer.triggerRepaint()

        return {self.INPUT: layer}