import os
import pandas as pd
from pathlib import Path
from pypsa.descriptors import Dict
from pypsa.components import components, component_attrs

import logging
logger = logging.getLogger(__name__)


def override_component_attrs(directory):
    """Tell PyPSA that links can have multiple outputs by
    overriding the component_attrs. This can be done for
    as many buses as you need with format busi for i = 2,3,4,5,....
    See https://pypsa.org/doc/components.html#link-with-multiple-outputs-or-inputs

    Parameters
    ----------
    directory : string
        Folder where component attributes to override are stored 
        analogous to ``pypsa/component_attrs``, e.g. `links.csv`.

    Returns
    -------
    Dictionary of overriden component attributes.
    """

    attrs = Dict({k : v.copy() for k,v in component_attrs.items()})

    for component, list_name in components.list_name.items():
        fn = f"{directory}/{list_name}.csv"
        if os.path.isfile(fn):
            overrides = pd.read_csv(fn, index_col=0, na_values="n/a")
            attrs[component] = overrides.combine_first(attrs[component])

    return attrs


# from pypsa-eur/_helpers.py
def mock_snakemake(rulename, **wildcards):
    """
    This function is expected to be executed from the 'scripts'-directory of '
    the snakemake project. It returns a snakemake.script.Snakemake object,
    based on the Snakefile.

    If a rule has wildcards, you have to specify them in **wildcards.

    Parameters
    ----------
    rulename: str
        name of the rule for which the snakemake object should be generated
    **wildcards:
        keyword arguments fixing the wildcards. Only necessary if wildcards are
        needed.
    """
    import snakemake as sm
    import os
    from pypsa.descriptors import Dict
    from snakemake.script import Snakemake

    script_dir = Path(__file__).parent.resolve()
    assert Path.cwd().resolve() == script_dir, \
      f'mock_snakemake has to be run from the repository scripts directory {script_dir}'
    os.chdir(script_dir.parent)
    for p in sm.SNAKEFILE_CHOICES:
        if os.path.exists(p):
            snakefile = p
            break
    workflow = sm.Workflow(snakefile)
    workflow.include(snakefile)
    workflow.global_resources = {}
    rule = workflow.get_rule(rulename)
    dag = sm.dag.DAG(workflow, rules=[rule])
    wc = Dict(wildcards)
    job = sm.jobs.Job(rule, dag, wc)

    def make_accessable(*ios):
        for io in ios:
            for i in range(len(io)):
                io[i] = os.path.abspath(io[i])

    make_accessable(job.input, job.output, job.log)
    snakemake = Snakemake(job.input, job.output, job.params, job.wildcards,
                          job.threads, job.resources, job.log,
                          job.dag.workflow.config, job.rule.name, None,)
    # create log and output dir if not existent
    for path in list(snakemake.log) + list(snakemake.output):
        Path(path).parent.mkdir(parents=True, exist_ok=True)

    os.chdir(script_dir)
    return snakemake

# from pypsa-eur/_helpers.py
def progress_retrieve(url, file):
    import urllib
    from progressbar import ProgressBar

    pbar = ProgressBar(0, 100)

    def dlProgress(count, blockSize, totalSize):
        pbar.update( int(count * blockSize * 100 / totalSize) )

    urllib.request.urlretrieve(url, file, reporthook=dlProgress)