#!/usr/bin/env python
###############################################################################
# $Id$
#
# Project:  GDAL/OGR Test Suite
# Purpose:  Test overviews in bands in VRT driver
# Author:   Even Rouault <even dot rouault at mines dash paris dot org>
# 
###############################################################################
# Copyright (c) 2010, Even Rouault <even dot rouault at mines dash paris dot org>
# 
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################

import os
import sys
import gdal

sys.path.append( '../pymod' )

import gdaltest

###############################################################################
# Simple test

def vrtovr_1():

    vrt_string = """<VRTDataset rasterXSize="20" rasterYSize="20">
  <VRTRasterBand dataType="Byte" band="1">
    <ColorInterp>Gray</ColorInterp>
    <SimpleSource>
      <SourceFilename relativeToVRT="0">data/byte.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SourceProperties RasterXSize="20" RasterYSize="20" DataType="Byte" BlockXSize="20" BlockYSize="20" />
      <SrcRect xOff="0" yOff="0" xSize="20" ySize="20" />
      <DstRect xOff="0" yOff="0" xSize="20" ySize="20" />
    </SimpleSource>
    <Overview>
      <SourceFilename relativeToVRT="0">data/byte.tif</SourceFilename>
      <SourceBand>1</SourceBand>
    </Overview>
  </VRTRasterBand>
</VRTDataset>"""

    ds = gdal.Open(vrt_string)
    if ds.GetRasterBand(1).GetOverviewCount() != 1:
        gdaltest.post_reason('did not get expected overview count')
        print(ds.GetRasterBand(1).GetOverviewCount())
        return 'fail'

    cs = ds.GetRasterBand(1).GetOverview(0).Checksum()
    if cs != 4672:
        gdaltest.post_reason('did not get expected overview checksum')
        print(cs)
        return 'fail'

    ds = None

    return 'success'

###############################################################################
# Test serialization

def vrtovr_2():

    vrt_string = """<VRTDataset rasterXSize="20" rasterYSize="20">
  <VRTRasterBand dataType="Byte" band="1">
    <ColorInterp>Gray</ColorInterp>
    <SimpleSource>
      <SourceFilename relativeToVRT="0">data/byte.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SourceProperties RasterXSize="20" RasterYSize="20" DataType="Byte" BlockXSize="20" BlockYSize="20" />
      <SrcRect xOff="0" yOff="0" xSize="20" ySize="20" />
      <DstRect xOff="0" yOff="0" xSize="20" ySize="20" />
    </SimpleSource>
    <Overview>
      <SourceFilename relativeToVRT="0">data/byte.tif</SourceFilename>
      <SourceBand>1</SourceBand>
    </Overview>
  </VRTRasterBand>
</VRTDataset>"""

    f = gdal.VSIFOpenL("/vsimem/vrtovr_2.vrt", "wb")
    gdal.VSIFWriteL(vrt_string, len(vrt_string), 1, f)
    gdal.VSIFCloseL(f)

    ds = gdal.Open("/vsimem/vrtovr_2.vrt", gdal.GA_Update)
    ds.GetRasterBand(1).SetDescription('foo')
    ds = None

    ds = gdal.Open("/vsimem/vrtovr_2.vrt")
    if ds.GetRasterBand(1).GetOverviewCount() != 1:
        gdaltest.post_reason('did not get expected overview count')
        print(ds.GetRasterBand(1).GetOverviewCount())
        return 'fail'

    cs = ds.GetRasterBand(1).GetOverview(0).Checksum()
    if cs != 4672:
        gdaltest.post_reason('did not get expected overview checksum')
        print(cs)
        return 'fail'

    ds = None

    gdal.Unlink("/vsimem/vrtovr_2.vrt")

    return 'success'


###############################################################################
# Cleanup.

def vrtovr_cleanup():
    return 'success'

gdaltest_list = [
    vrtovr_1,
    vrtovr_2,
    vrtovr_cleanup ]

if __name__ == '__main__':

    gdaltest.setup_run( 'vrtovr' )

    gdaltest.run_tests( gdaltest_list )

    gdaltest.summarize()