"""
Space time dataset import functions

Usage:

.. code-block:: python

    import grass.temporal as tgis

    input="/tmp/temp_1950_2012.tar.gz"
    output="temp_1950_2012"
    directory="/tmp"
    title="My new dataset"
    descr="May new shiny dataset"
    location=None
    link=True
    exp=True
    overr=False
    create=False
    tgis.import_stds(input, output, directory, title, descr, location,
                    link, exp, overr, create, "strds")


(C) 2012-2013 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.

:authors: Soeren Gebbert
"""

import os
import os.path
import tarfile

from .core import get_current_mapset, get_tgis_message_interface
from .register import register_maps_in_space_time_dataset
from .factory import dataset_factory
import grass.script as gscript
from grass.exceptions import CalledModuleError

proj_file_name = "proj.txt"
init_file_name = "init.txt"
list_file_name = "list.txt"

# This global variable is for unique vector map export,
# since single vector maps may have several layer
# and therefore several attribute tables
imported_maps = {}

############################################################################


def _import_raster_maps_from_gdal(
    maplist, overr, exp, location, link, format_, set_current_region=False, memory=300
):
    impflags = ""
    if overr:
        impflags += "o"
    if exp or location:
        impflags += "e"
    for row in maplist:
        name = row["name"]
        if format_ == "GTiff":
            filename = row["filename"] + ".tif"
        elif format_ == "AAIGrid":
            filename = row["filename"] + ".asc"
            if not overr:
                impflags += "o"

        try:
            if link:
                gscript.run_command(
                    "r.external",
                    input=filename,
                    output=name,
                    flags=impflags,
                    overwrite=gscript.overwrite(),
                )
            else:
                gscript.run_command(
                    "r.in.gdal",
                    input=filename,
                    output=name,
                    memory=memory,
                    flags=impflags,
                    overwrite=gscript.overwrite(),
                )

        except CalledModuleError:
            gscript.fatal(
                _("Unable to import/link raster map <%s> from file" " %s.")
                % (name, filename)
            )

        # Set the color rules if present
        filename = row["filename"] + ".color"
        if os.path.isfile(filename):
            try:
                gscript.run_command(
                    "r.colors", map=name, rules=filename, overwrite=gscript.overwrite()
                )
            except CalledModuleError:
                gscript.fatal(
                    _("Unable to set the color rules for " "raster map <%s>.") % name
                )

    # Set the computational region from the last map imported
    if set_current_region is True:
        gscript.run_command("g.region", raster=name)


############################################################################


def _import_raster_maps(maplist, set_current_region=False):
    # We need to disable the projection check because of its
    # simple implementation
    impflags = "o"
    for row in maplist:
        name = row["name"]
        filename = row["filename"] + ".pack"
        try:
            gscript.run_command(
                "r.unpack",
                input=filename,
                output=name,
                flags=impflags,
                overwrite=gscript.overwrite(),
                verbose=True,
            )

        except CalledModuleError:
            gscript.fatal(
                _("Unable to unpack raster map <%s> from file " "%s.")
                % (name, filename)
            )

    # Set the computational region from the last map imported
    if set_current_region is True:
        gscript.run_command("g.region", raster=name)


############################################################################


def _import_vector_maps_from_gml(maplist, overr, exp, location, link):
    impflags = "o"
    if exp or location:
        impflags += "e"
    for row in maplist:
        name = row["name"]
        filename = row["filename"] + ".xml"

        try:
            gscript.run_command(
                "v.in.ogr",
                input=filename,
                output=name,
                flags=impflags,
                overwrite=gscript.overwrite(),
            )

        except CalledModuleError:
            gscript.fatal(
                _("Unable to import vector map <%s> from file " "%s.")
                % (name, filename)
            )


############################################################################


def _import_vector_maps(maplist):
    # We need to disable the projection check because of its
    # simple implementation
    impflags = "o"
    for row in maplist:
        # Separate the name from the layer
        name = row["name"].split(":")[0]
        # Import only unique maps
        if name in imported_maps:
            continue
        filename = row["filename"] + ".pack"
        try:
            gscript.run_command(
                "v.unpack",
                input=filename,
                output=name,
                flags=impflags,
                overwrite=gscript.overwrite(),
                verbose=True,
            )

        except CalledModuleError:
            gscript.fatal(
                _("Unable to unpack vector map <%s> from file " "%s.")
                % (name, filename)
            )

        imported_maps[name] = name


############################################################################


def import_stds(
    input,
    output,
    directory,
    title=None,
    descr=None,
    location=None,
    link=False,
    exp=False,
    overr=False,
    create=False,
    stds_type="strds",
    base=None,
    set_current_region=False,
    memory=300,
):
    """Import space time datasets of type raster and vector

    :param input: Name of the input archive file
    :param output: The name of the output space time dataset
    :param directory: The extraction directory
    :param title: The title of the new created space time dataset
    :param descr: The description of the new created
                 space time dataset
    :param location: The name of the location that should be created,
                    maps are imported into this location
    :param link: Switch to link raster maps instead importing them
    :param exp: Extend location extents based on new dataset
    :param overr: Override projection (use location's projection)
    :param create: Create the location specified by the "location"
                  parameter and exit.
                  Do not import the space time datasets.
    :param stds_type: The type of the space time dataset that
                     should be imported
    :param base: The base name of the new imported maps, it will be
                 extended using a numerical index.
    :param memory: Cache size for raster rows, used in r.in.gdal
    """

    old_state = gscript.raise_on_error
    gscript.set_raise_on_error(True)

    # Check if input file and extraction directory exits
    if not os.path.exists(input):
        gscript.fatal(_("Space time raster dataset archive <%s> not found") % input)
    if not create and not os.path.exists(directory):
        gscript.fatal(_("Extraction directory <%s> not found") % directory)

    tar = tarfile.open(name=input, mode="r")

    # Check for important files
    msgr = get_tgis_message_interface()
    msgr.message(
        _(
            "Checking validity of input file (size: %0.1f MB). Make take a while..."
            % (os.path.getsize(input) / (1024 * 1024.0))
        )
    )
    members = tar.getnames()
    # Make sure that the basenames of the files are used for comparison
    member_basenames = [os.path.basename(name) for name in members]

    if init_file_name not in member_basenames:
        gscript.fatal(_("Unable to find init file <%s>") % init_file_name)
    if list_file_name not in member_basenames:
        gscript.fatal(_("Unable to find list file <%s>") % list_file_name)
    if proj_file_name not in member_basenames:
        gscript.fatal(_("Unable to find projection file <%s>") % proj_file_name)

    msgr.message(_("Extracting data..."))
    tar.extractall(path=directory)
    tar.close()

    # We use a new list file name for map registration
    new_list_file_name = list_file_name + "_new"
    # Save current working directory path
    old_cwd = os.getcwd()

    # Switch into the data directory
    os.chdir(directory)

    # Check projection information
    if not location:
        temp_name = gscript.tempfile()
        temp_file = open(temp_name, "w")
        proj_name = os.path.abspath(proj_file_name)

        # We need to convert projection strings generated
        # from other programs than g.proj into
        # new line format so that the grass file comparison function
        # can be used to compare the projections
        proj_name_tmp = temp_name + "_in_projection"
        proj_file = open(proj_name, "r")
        proj_content = proj_file.read()
        proj_content = proj_content.replace(" +", "\n+")
        proj_content = proj_content.replace("\t+", "\n+")
        proj_file.close()

        proj_file = open(proj_name_tmp, "w")
        proj_file.write(proj_content)
        proj_file.close()

        p = gscript.start_command("g.proj", flags="j", stdout=temp_file)
        p.communicate()
        temp_file.close()

        if not gscript.compare_key_value_text_files(temp_name, proj_name_tmp, sep="="):
            if overr:
                gscript.warning(
                    _("Projection information does not match. " "Proceeding...")
                )
            else:
                diff = "".join(gscript.diff_files(temp_name, proj_name))
                gscript.warning(
                    _(
                        "Difference between PROJ_INFO file of "
                        "imported map and of current location:"
                        "\n{diff}"
                    ).format(diff=diff)
                )
                gscript.fatal(_("Projection information does not match. " "Aborting."))

    # Create a new location based on the projection information and switch
    # into it
    old_env = gscript.gisenv()
    if location:
        try:
            proj4_string = open(proj_file_name, "r").read()
            gscript.create_location(
                dbase=old_env["GISDBASE"], location=location, proj4=proj4_string
            )
            # Just create a new location and return
            if create:
                os.chdir(old_cwd)
                return
        except Exception as e:
            gscript.fatal(
                _("Unable to create location %(l)s. Reason: %(e)s")
                % {"l": location, "e": str(e)}
            )
        # Switch to the new created location
        try:
            gscript.run_command(
                "g.mapset",
                mapset="PERMANENT",
                location=location,
                dbase=old_env["GISDBASE"],
            )
        except CalledModuleError:
            gscript.fatal(_("Unable to switch to location %s") % location)
        # create default database connection
        try:
            gscript.run_command("t.connect", flags="d")
        except CalledModuleError:
            gscript.fatal(
                _("Unable to create default temporal database " "in new location %s")
                % location
            )

    try:
        # Make sure the temporal database exists
        from .core import init

        init()

        fs = "|"
        maplist = []
        mapset = get_current_mapset()
        list_file = open(list_file_name, "r")
        new_list_file = open(new_list_file_name, "w")

        # get number of lines to correctly form the suffix
        max_count = -1
        for max_count, l in enumerate(list_file):
            pass
        max_count += 1
        list_file.seek(0)

        # Read the map list from file
        line_count = 0
        while True:
            line = list_file.readline()
            if not line:
                break

            line_list = line.split(fs)

            # The filename is actually the base name of the map
            # that must be extended by the file suffix
            filename = line_list[0].strip().split(":")[0]
            if base:
                mapname = "%s_%s" % (
                    base,
                    gscript.get_num_suffix(line_count + 1, max_count),
                )
                mapid = "%s@%s" % (mapname, mapset)
            else:
                mapname = filename
                mapid = mapname + "@" + mapset

            row = {}
            row["filename"] = filename
            row["name"] = mapname
            row["id"] = mapid
            row["start"] = line_list[1].strip()
            row["end"] = line_list[2].strip()

            new_list_file.write(
                "%s%s%s%s%s\n" % (mapname, fs, row["start"], fs, row["end"])
            )

            maplist.append(row)
            line_count += 1

        list_file.close()
        new_list_file.close()

        # Read the init file
        fs = "="
        init = {}
        init_file = open(init_file_name, "r")
        while True:
            line = init_file.readline()
            if not line:
                break

            kv = line.split(fs)
            init[kv[0]] = kv[1].strip()

        init_file.close()

        if (
            "temporal_type" not in init
            or "semantic_type" not in init
            or "number_of_maps" not in init
        ):
            gscript.fatal(
                _("Key words %(t)s, %(s)s or %(n)s not found in init" " file.")
                % {"t": "temporal_type", "s": "semantic_type", "n": "number_of_maps"}
            )

        if line_count != int(init["number_of_maps"]):
            gscript.fatal(_("Number of maps mismatch in init and list file."))

        format_ = "GTiff"
        type_ = "strds"

        if "stds_type" in init:
            type_ = init["stds_type"]
        if "format" in init:
            format_ = init["format"]

        if stds_type != type_:
            gscript.fatal(_("The archive file is of wrong space time dataset" " type"))

        # Check the existence of the files
        if format_ == "GTiff":
            for row in maplist:
                filename = row["filename"] + ".tif"
                if not os.path.exists(filename):
                    gscript.fatal(
                        _("Unable to find GeoTIFF raster file " "<%s> in archive.")
                        % filename
                    )
        elif format_ == "AAIGrid":
            for row in maplist:
                filename = row["filename"] + ".asc"
                if not os.path.exists(filename):
                    gscript.fatal(
                        _("Unable to find AAIGrid raster file " "<%s> in archive.")
                        % filename
                    )
        elif format_ == "GML":
            for row in maplist:
                filename = row["filename"] + ".xml"
                if not os.path.exists(filename):
                    gscript.fatal(
                        _("Unable to find GML vector file " "<%s> in archive.")
                        % filename
                    )
        elif format_ == "pack":
            for row in maplist:
                if type_ == "stvds":
                    filename = str(row["filename"].split(":")[0]) + ".pack"
                else:
                    filename = row["filename"] + ".pack"
                if not os.path.exists(filename):
                    gscript.fatal(
                        _("Unable to find GRASS package file " "<%s> in archive.")
                        % filename
                    )
        else:
            gscript.fatal(_("Unsupported input format"))

        # Check the space time dataset
        id = output + "@" + mapset
        sp = dataset_factory(type_, id)
        if sp.is_in_db() and gscript.overwrite() is False:
            gscript.fatal(
                _(
                    "Space time %(t)s dataset <%(sp)s> is already in"
                    " the database. Use the overwrite flag."
                )
                % {"t": type_, "sp": sp.get_id()}
            )

        # Import the maps
        if type_ == "strds":
            if format_ == "GTiff" or format_ == "AAIGrid":
                _import_raster_maps_from_gdal(
                    maplist,
                    overr,
                    exp,
                    location,
                    link,
                    format_,
                    set_current_region,
                    memory,
                )
            if format_ == "pack":
                _import_raster_maps(maplist, set_current_region)
        elif type_ == "stvds":
            if format_ == "GML":
                _import_vector_maps_from_gml(maplist, overr, exp, location, link)
            if format_ == "pack":
                _import_vector_maps(maplist)

        # Create the space time dataset
        if sp.is_in_db() and gscript.overwrite() is True:
            gscript.info(
                _(
                    "Overwrite space time %(sp)s dataset "
                    "<%(id)s> and unregister all maps."
                )
                % {"sp": sp.get_new_map_instance(None).get_type(), "id": sp.get_id()}
            )
            sp.delete()
            sp = sp.get_new_instance(id)

        temporal_type = init["temporal_type"]
        semantic_type = init["semantic_type"]
        relative_time_unit = None
        if temporal_type == "relative":
            if "relative_time_unit" not in init:
                gscript.fatal(
                    _("Key word %s not found in init file.") % ("relative_time_unit")
                )
            relative_time_unit = init["relative_time_unit"]
            sp.set_relative_time_unit(relative_time_unit)

        gscript.verbose(
            _("Create space time %s dataset.")
            % sp.get_new_map_instance(None).get_type()
        )

        sp.set_initial_values(
            temporal_type=temporal_type,
            semantic_type=semantic_type,
            title=title,
            description=descr,
        )
        sp.insert()

        # register the maps
        fs = "|"
        register_maps_in_space_time_dataset(
            type=sp.get_new_map_instance(None).get_type(),
            name=output,
            file=new_list_file_name,
            start="file",
            end="file",
            unit=relative_time_unit,
            dbif=None,
            fs=fs,
            update_cmd_list=False,
        )

        os.chdir(old_cwd)
    # Make sure the location is switched back correctly
    finally:
        if location:
            # Switch to the old location
            try:
                gscript.run_command(
                    "g.mapset",
                    mapset=old_env["MAPSET"],
                    location=old_env["LOCATION_NAME"],
                    gisdbase=old_env["GISDBASE"],
                )
            except CalledModuleError:
                gscript.warning(_("Switching to original location failed"))

        gscript.set_raise_on_error(old_state)
