# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:

import os.path as op
import warnings

import numpy as np
import networkx as nx

from ..base import (BaseInterface, BaseInterfaceInputSpec, traits,
                    File, TraitedSpec, InputMultiPath,
                    OutputMultiPath, isdefined)
from ...utils.misc import package_check
from ... import logging
iflogger = logging.getLogger('interface')

have_cv = True
try:
    package_check('cviewer')
except Exception as e:
    have_cv = False
else:
    import cviewer.libs.pyconto.groupstatistics.nbs as nbs


def ntwks_to_matrices(in_files, edge_key):
    first = nx.read_gpickle(in_files[0])
    files = len(in_files)
    nodes = len(first.nodes())
    matrix = np.zeros((nodes, nodes, files))
    for idx, name in enumerate(in_files):
        graph = nx.read_gpickle(name)
        for u, v, d in graph.edges(data=True):
            graph[u][v]['weight'] = d[edge_key]  # Setting the edge requested edge value as weight value
        matrix[:, :, idx] = nx.to_numpy_matrix(graph)  # Retrieve the matrix
    return matrix


class NetworkBasedStatisticInputSpec(BaseInterfaceInputSpec):
    in_group1 = InputMultiPath(File(exists=True), mandatory=True, desc='Networks for the first group of subjects')
    in_group2 = InputMultiPath(File(exists=True), mandatory=True, desc='Networks for the second group of subjects')
    node_position_network = File(desc='An optional network used to position the nodes for the output networks')
    number_of_permutations = traits.Int(1000, usedefault=True, desc='Number of permutations to perform')
    threshold = traits.Float(3, usedefault=True, desc='T-statistic threshold')
    t_tail = traits.Enum('left', 'right', 'both', usedefault=True, desc='Can be one of "left", "right", or "both"')
    edge_key = traits.Str('number_of_fibers', usedefault=True, desc='Usually "number_of_fibers, "fiber_length_mean", "fiber_length_std" for matrices made with CMTK'
                          'Sometimes "weight" or "value" for functional networks.')
    out_nbs_network = File(desc='Output network with edges identified by the NBS')
    out_nbs_pval_network = File(desc='Output network with p-values to weight the edges identified by the NBS')


class NetworkBasedStatisticOutputSpec(TraitedSpec):
    nbs_network = File(exists=True, desc='Output network with edges identified by the NBS')
    nbs_pval_network = File(exists=True, desc='Output network with p-values to weight the edges identified by the NBS')
    network_files = OutputMultiPath(File(exists=True), desc='Output network with edges identified by the NBS')


class NetworkBasedStatistic(BaseInterface):
    """
    Calculates and outputs the average network given a set of input NetworkX gpickle files

    For documentation of Network-based statistic parameters:

            https://github.com/LTS5/connectomeviewer/blob/master/cviewer/libs/pyconto/groupstatistics/nbs/_nbs.py

    Example
    -------

    >>> import nipype.interfaces.cmtk as cmtk
    >>> nbs = cmtk.NetworkBasedStatistic()
    >>> nbs.inputs.in_group1 = ['subj1.pck', 'subj2.pck'] # doctest: +SKIP
    >>> nbs.inputs.in_group2 = ['pat1.pck', 'pat2.pck'] # doctest: +SKIP
    >>> nbs.run()                 # doctest: +SKIP
    """
    input_spec = NetworkBasedStatisticInputSpec
    output_spec = NetworkBasedStatisticOutputSpec

    def _run_interface(self, runtime):
        THRESH = self.inputs.threshold
        K = self.inputs.number_of_permutations
        TAIL = self.inputs.t_tail
        edge_key = self.inputs.edge_key
        details = edge_key + '-thresh-' + str(THRESH) + '-k-' + str(K) + '-tail-' + TAIL + '.pck'

        # Fill in the data from the networks
        X = ntwks_to_matrices(self.inputs.in_group1, edge_key)
        Y = ntwks_to_matrices(self.inputs.in_group2, edge_key)

        PVAL, ADJ, _ = nbs.compute_nbs(X, Y, THRESH, K, TAIL)

        iflogger.info('p-values:')
        iflogger.info(PVAL)

        pADJ = ADJ.copy()
        for idx, _ in enumerate(PVAL):
            x, y = np.where(ADJ == idx + 1)
            pADJ[x, y] = PVAL[idx]

        # Create networkx graphs from the adjacency matrix
        nbsgraph = nx.from_numpy_matrix(ADJ)
        nbs_pval_graph = nx.from_numpy_matrix(pADJ)

        # Relabel nodes because they should not start at zero for our convention
        nbsgraph = nx.relabel_nodes(nbsgraph, lambda x: x + 1)
        nbs_pval_graph = nx.relabel_nodes(nbs_pval_graph, lambda x: x + 1)

        if isdefined(self.inputs.node_position_network):
            node_ntwk_name = self.inputs.node_position_network
        else:
            node_ntwk_name = self.inputs.in_group1[0]

        node_network = nx.read_gpickle(node_ntwk_name)
        iflogger.info('Populating node dictionaries with attributes from {node}'.format(node=node_ntwk_name))

        for nid, ndata in node_network.nodes_iter(data=True):
            nbsgraph.node[nid] = ndata
            nbs_pval_graph.node[nid] = ndata

        path = op.abspath('NBS_Result_' + details)
        iflogger.info(path)
        nx.write_gpickle(nbsgraph, path)
        iflogger.info('Saving output NBS edge network as {out}'.format(out=path))

        pval_path = op.abspath('NBS_P_vals_' + details)
        iflogger.info(pval_path)
        nx.write_gpickle(nbs_pval_graph, pval_path)
        iflogger.info('Saving output p-value network as {out}'.format(out=pval_path))
        return runtime

    def _list_outputs(self):
        outputs = self.output_spec().get()

        THRESH = self.inputs.threshold
        K = self.inputs.number_of_permutations
        TAIL = self.inputs.t_tail
        edge_key = self.inputs.edge_key
        details = edge_key + '-thresh-' + str(THRESH) + '-k-' + str(K) + '-tail-' + TAIL + '.pck'
        path = op.abspath('NBS_Result_' + details)
        pval_path = op.abspath('NBS_P_vals_' + details)

        outputs['nbs_network'] = path
        outputs['nbs_pval_network'] = pval_path
        outputs['network_files'] = [path, pval_path]
        return outputs

    def _gen_outfilename(self, name, ext):
        return name + '.' + ext
