#!/usr/bin/env python
"""
MODULE:    r.in.wms

AUTHOR(S): Stepan Turek <stepan.turek AT seznam.cz>

PURPOSE:   Downloads and imports data from WMS/WMTS/NASA OnEarth server.

COPYRIGHT: (C) 2012 Stepan Turek, and by the GRASS Development Team

This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.
"""

#%module
#% description: Downloads and imports data from WMS/WMTS/NASA OnEarth server.
#% keyword: raster
#% keyword: import
#% keyword: OGC web services
#%end

#%option
#% key: url
#% type: string
#% description: Typically starts with "http://"
#% required: yes
#%end

#%option G_OPT_R_OUTPUT
#% description: Name for output raster map
#%end

#%option
#% key: layers
#% type: string
#% description: Layer(s) to request from the map server
#% multiple: yes
#% required: yes
#%end

#%option
#% key: styles
#% type: string
#% description: Layer style(s) to request from the map server
#% multiple: yes
#% guisection: Map style
#%end

#%option
#% key: format
#% type: string
#% description: Image format requested from the server
#% options: geotiff,tiff,jpeg,gif,png,png8
#% answer: png
#% guisection: Request
#%end

#%option
#% key: srs
#% type: integer
#% description: EPSG code of requested source projection
#% answer:4326
#% guisection: Request
#%end

#%option
#% key: driver
#% type:string
#% description: Driver used to communication with server
#% descriptions: WMS_GDAL;Download data using GDAL WMS driver;WMS_GRASS;Download data using native GRASS-WMS driver;WMTS_GRASS;Download data using native GRASS-WMTS driver;OnEarth_GRASS;Download data using native GRASS-OnEarth driver;
#% options:WMS_GDAL, WMS_GRASS, WMTS_GRASS, OnEarth_GRASS
#% answer:WMS_GRASS
#% guisection: Connection
#%end

#%option
#% key: wms_version
#% type:string
#% description: WMS standard version
#% options: 1.1.1,1.3.0
#% answer: 1.1.1
#% guisection: Request
#%end

#%option
#% key: maxcols
#% type:integer
#% description: Maximum columns to request at a time
#% answer:512
#% guisection: Request
#%end

#%option
#% key: maxrows
#% type: integer
#% description: Maximum rows to request at a time
#% answer: 512
#% guisection: Request
#%end

#%option
#% key: urlparams
#% type:string
#% description: Additional query parameters to pass to the server
#% guisection: Request
#%end

#%option
#% key: username
#% type:string
#% description: Username for server connection
#% guisection: Connection
#%end

#%option
#% key: password
#% type:string
#% description: Password for server connection
#% guisection: Connection
#%end

#%option
#% key: method
#% type: string
#% description: Interpolation method to use in reprojection
#% options:nearest,linear,cubic,cubicspline
#% answer:nearest
#% required: no
#%end

#%option
#% key: region
#% type: string
#% description: Request data for this named region instead of the current region bounds
#% guisection: Request
#%end

#%option
#% key: bgcolor
#% type: string
#% label: Background color
#% description: Format: 0xRRGGBB
#% guisection: Map style
#%end

#%option G_OPT_F_BIN_INPUT
#% key: capfile
#% required: no
#% description: Capabilities file to parse (input). It is relevant for WMTS_GRASS and OnEarth_GRASS drivers
#%end

#%option G_OPT_F_OUTPUT
#% key: capfile_output
#% required: no
#% description: File where the server capabilities will be saved ('c' flag)
#%end

#%flag
#% key: c
#% description: Get the server capabilities then exit
#% guisection: Request
#% suppress_required: yes
#%end

#%flag
#% key: o
#% description: Do not request transparent data
#% guisection: Map style
#%end

#%rules
#% exclusive: capfile_output, capfile
#%end

import os
import sys
sys.path.insert(1, os.path.join(os.path.dirname(sys.path[0]), 'etc', 'r.in.wms'))

import grass.script as grass


def GetRegionParams(opt_region):

    # set region
    if opt_region:
        reg_spl = opt_region.strip().split('@', 1)
        reg_mapset = '.'
        if len(reg_spl) > 1:
            reg_mapset = reg_spl[1]

        if not grass.find_file(name=reg_spl[0], element='windows', mapset=reg_mapset)['name']:
            grass.fatal(_("Region <%s> not found") % opt_region)

    if opt_region:
        s = grass.read_command('g.region',
                               quiet=True,
                               flags='ug',
                               region=opt_region)
        region_params = grass.parse_key_val(s, val_type=float)
    else:
        region_params = grass.region()

    return region_params


def main():

    if 'GRASS' in options['driver']:
        grass.debug("Using GRASS driver")
        from wms_drv import WMSDrv
        wms = WMSDrv()
    elif 'GDAL' in options['driver']:
        grass.debug("Using GDAL WMS driver")
        from wms_gdal_drv import WMSGdalDrv
        wms = WMSGdalDrv()

    if flags['c']:
        wms.GetCapabilities(options)
    else:
        from wms_base import GRASSImporter
        options['region'] = GetRegionParams(options['region'])
        fetched_map = wms.GetMap(options, flags)

        grass.message(_("Importing raster map into GRASS..."))
        if not fetched_map:
            grass.warning(_("Nothing to import.\nNo data has been downloaded from wms server."))
            return
        importer = GRASSImporter(options['output'])
        importer.ImportMapIntoGRASS(fetched_map)

    return 0


if __name__ == "__main__":
    options, flags = grass.parser()
    sys.exit(main())
