# coding=utf-8
import csv

import os
from autosubmit.date.chunk_date_lib import parse_date, add_months

from earthdiagnostics.datamanager import DataManager, NetCDFFile
from earthdiagnostics.utils import TempFile, Utils
import urllib

from earthdiagnostics.variable import Variable


class THREDDSManager(DataManager):
    """
    Data manager class for CMORized experiments
    """
    def __init__(self, config):
        super(THREDDSManager, self).__init__(config)
        self.server_url = config.thredds.server_url
        data_folders = self.config.data_dir.split(':')
        self.config.data_dir = None
        for data_folder in data_folders:
            if os.path.isdir(os.path.join(data_folder, self.experiment.institute.lower(),
                                          self.experiment.model.lower())):
                self.config.data_dir = data_folder
                break

        if not self.config.data_dir:
            raise Exception('Can not find model data')

    def get_leadtimes(self, domain, variable, startdate, member, leadtimes, frequency=None):
        if not frequency:
            frequency = self.config.frequency
        aggregation_path = self.get_var_url(variable, startdate, frequency, None, False)
        temp = TempFile.get()
        startdate = parse_date(startdate)
        selected_months = ','.join([str(add_months(startdate, i, 'standard').month) for i in leadtimes])
        select_months = '-selmonth,{0} {1}'.format(selected_months, aggregation_path)
        selected_years = ','.join([str(add_months(startdate, i, 'standard').year) for i in leadtimes])
        Utils.cdo.selyear(selected_years, input=select_months, output=temp)
        return temp

    def get_file(self, domain, var, startdate, member, chunk, grid=None, box=None, frequency=None):
        """
        Copies a given file from the CMOR repository to the scratch folder and returns the path to the scratch's copy

        :param domain: CMOR domain
        :type domain: str
        :param var: variable name
        :type var: str
        :param startdate: file's startdate
        :type startdate: str
        :param member: file's member
        :type member: int
        :param chunk: file's chunk
        :type chunk: int
        :param grid: file's grid (only needed if it is not the original)
        :type grid: str
        :param box: file's box (only needed to retrieve sections or averages)
        :type box: Box
        :param frequency: file's frequency (only needed if it is different from the default)
        :type frequency: str
        :return: path to the copy created on the scratch folder
        :rtype: str
        """
        if not frequency:
            frequency = self.config.frequency
        aggregation_path = self.get_var_url(var, startdate, frequency, box, True)
        temp = TempFile.get()
        urllib.urlretrieve(aggregation_path, temp)
        if not Utils.check_netcdf_file(temp):
            raise THREDDSError('Can not retrieve {0} from server'.format(aggregation_path))
        return temp

    def send_file(self, filetosend, domain, var, startdate, member, chunk=None, grid=None, region=None, box=None,
                  rename_var=None, frequency=None, year=None, date_str=None, move_old=False,
                  diagnostic=None, cmorized=False):
        """
        Copies a given file to the CMOR repository. It also automatically converts to netCDF 4 if needed and can merge
        with already existing ones as needed

        :param move_old: if true, moves files following older conventions that may be found on the links folder
        :type move_old: bool
        :param date_str: exact date_str to use in the cmorized file
        :type: str
        :param year: if frequency is yearly, this parameter is used to give the corresponding year
        :type year: int
        :param rename_var: if exists, the given variable will be renamed to the one given by var
        :type rename_var: str
        :param filetosend: path to the file to send to the CMOR repository
        :type filetosend: str
        :param region: specifies the region represented by the file. If it is defined, the data will be appended to the
            CMOR repository as a new region in the file or will overwrite if region was already present
        :type region: str
        :param domain: CMOR domain
        :type domain: Domain
        :param var: variable name
        :type var: str
        :param startdate: file's startdate
        :type startdate: str
        :param member: file's member
        :type member: int
        :param chunk: file's chunk
        :type chunk: int
        :param grid: file's grid (only needed if it is not the original)
        :type grid: str
        :param box: file's box (only needed to retrieve sections or averages)
        :type box: Box
        :param frequency: file's frequency (only needed if it is different from the default)
        :type frequency: str
        :param diagnostic: diagnostic used to generate the file
        :type diagnostic: Diagnostic
        :param cmorized: flag to indicate if file was generated in cmorization process
        :type cmorized: bool

        """
        if cmorized:
            raise ValueError('cmorized is not supported in THREDDS manager')
        original_var = var
        cmor_var = Variable.get_variable(var)
        var = self._get_final_var_name(box, var)

        if rename_var and rename_var != var:
            Utils.rename_variable(filetosend, rename_var, var)
        elif original_var != var:
            Utils.rename_variable(filetosend, original_var, var)

        if not frequency:
            frequency = self.config.frequency

        filepath = self.get_file_path(startdate, domain, var, frequency, box,
                                      grid)
        netcdf_file = NetCDFFile(filepath, filetosend, domain, var, cmor_var)
        if diagnostic:
            netcdf_file.add_diagnostic_history(diagnostic)
        else:
            raise ValueError('You must provide a diagnostic to store data using the THREDDSmanager')
        netcdf_file.send()

    def get_file_path(self, startdate, domain, var, frequency,
                      box=None, grid=None):
        """
        Returns the path to a concrete file
        :param startdate: file's startdate
        :type startdate: str
        :param domain: file's domain
        :type domain: str
        :param var: file's var
        :type var: str
        :param frequency: file's frequency
        :type frequency: str
        :param box: file's box
        :type box: Box
        :param grid: file's grid
        :type grid: str
        :return: path to the file
        :rtype: str
        """
        if not frequency:
            frequency = self.config.frequency
        var = self._get_final_var_name(box, var)

        folder_path = self._get_folder_path(frequency, domain, var, grid)
        if startdate:
            file_name = '{0}_{1}.nc'.format(var, startdate)
        else:
            file_name = '{0}.nc'.format(var)

        filepath = os.path.join(folder_path, file_name)
        return filepath

    def _get_folder_path(self, frequency, domain, variable, grid):
        folder_path = os.path.join(self.config.data_dir,
                                   self.experiment.institute.lower(),
                                   self.experiment.model.lower(),
                                   self.frequency_folder_name(frequency),
                                   self.get_varfolder(domain, variable, grid))
        return folder_path

    def get_year(self, domain, var, startdate, member, year, grid=None, box=None):
        """
        Ge a file containing all the data for one year for one variable
        :param domain: variable's domain
        :type domain: str
        :param var: variable's name
        :type var: str
        :param startdate: startdate to retrieve
        :type startdate: str
        :param member: member to retrieve
        :type member: int
        :param year: year to retrieve
        :type year: int
        :param grid: variable's grid
        :type grid: str
        :param box: variable's box
        :type box: Box
        :return:
        """

    def get_var_url(self, var, startdate, frequency, box, fileserver):
        var = self._get_final_var_name(box, var)
        if fileserver:
            protocol = 'fileServer'
        else:
            protocol = 'dodsC'
        return os.path.join(self.server_url, protocol, 'exp', self.experiment.institute,
                            self.experiment.model, self.frequency_folder_name(frequency),
                            var, '{0}_{1}.nc'.format(var, startdate))

    def link_file(self, domain, var, startdate, member, chunk=None, grid=None, box=None,
                  frequency=None, year=None, date_str=None, move_old=False):
        """
        Creates the link of a given file from the CMOR repository.

        :param move_old:
        :param date_str:
        :param year: if frequency is yearly, this parameter is used to give the corresponding year
        :type year: int
        :param domain: CMOR domain
        :type domain: str
        :param var: variable name
        :type var: str
        :param startdate: file's startdate
        :type startdate: str
        :param member: file's member
        :type member: int
        :param chunk: file's chunk
        :type chunk: int
        :param grid: file's grid (only needed if it is not the original)
        :type grid: str
        :param box: file's box (only needed to retrieve sections or averages)
        :type box: Box
        :param frequency: file's frequency (only needed if it is different from the default)
        :type frequency: str
        :return: path to the copy created on the scratch folder
        :rtype: str
        """
        # THREDDSManager does not require links
        pass


class THREDDSError(Exception):
    pass