<commit_before>"""Provides models for processes and process patches.
"""


# System imports
import warnings
from inspect import getsource
from copy import copy
from os.path import isfile

# Six imports
from six import string_types

# ROOT imports
from ROOT import TChain, TColor

# owls-hep imports
from owls_hep.expression import multiplied
from owls_hep.output import print_warning


# Set up default exports
__all__ = [
    'Patch',
    'Process',
]

class Patch(object):
    """A reusable process patch weighs/filters events according to an
    expression.
    """

    def __init__(self, selection):
        """Initializes a new instance of the Patch class.

        Args:
            selection: The selection expression to apply to the process data
        """
        self._selection = selection

    def state(self):
        """Returns a representation of the patch's internal state, if any.
        """
        return (self._selection,)

    def selection(self):
        """Returns the selection string for the patch.

        Returns:
            The selection string.
        """
        return self._selection


class Process(object):
    """Represents a physical process whose events may be encoded in one or more
    data files and which should be rendered according to a certain style.
    """

    def __init__(self,
                 files,
                 tree,
                 label,
                 line_color = 1,
                 fill_color = 0,
                 marker_style = None,
                 metadata = None):
        """Initializes a new instance of the Process class.

        Args:
            files: An iterable of ROOT file paths for files representing the
                process
            tree: The ROOT TTree path within the files to use
            label: The ROOT TLatex label string to use when rendering the
                process
            line_color: The ROOT TColor number or hex string (#rrggbb) to use
                as the line color when rendering the process
            fill_color: The ROOT TColor number or hex string (#rrggbb) to use
                as the fill color when rendering the process
            marker_style: The ROOT TMarker number to use as the marker style
                when rendering the process
            metadata: A (pickleable) object containing optional metadata
        """
        # Store parameters
        self._files = tuple(files)
        self._tree = tree
        self._label = label
        self._line_color = line_color
        self._fill_color = fill_color
        self._marker_style = marker_style
        self._metadata = metadata

        # Translate hex colors if necessary
        if isinstance(self._line_color, string_types):
            self._line_color = TColor.GetColor(self._line_color)
        if isinstance(self._fill_color, string_types):
            self._fill_color = TColor.GetColor(self._fill_color)

        # Create initial patches container
        self._patches = ()

    def __hash__(self):
        """Returns a hash for the process.
        """
        # Hash only files, tree, and patches since those are all that really
        # matter for data loading
        return hash((self._files, self._tree, self._patches))

    def metadata(self):
        """Returns the metadata for the process, if any.
        """
        return self._metadata

    def patches(self):
        """Returns an expression of patches for the process, if any.
        """
        return multiplied(*self._patches)

    # NOTE: We could instead return a list of TTrees/TFiles, because using
    # individual TFile/TTree objects might be slightly faster than creating
    # one huge TChain.
    def load(self):
        """Loads the given properties of the process data.

        The tree weights of the TTrees are included in the resultant DataFrame
        as the 'tree_weight' property.

        Returns:
            A TChain for the process.
        """

        chain = TChain(self._tree)
        for f in self._files:
            if not isfile(f):
                raise RuntimeError('filed does not exist {0}'.format(f))
            chain.Add(f)

        # All done
        return chain

    def retreed(self, tree):
        """Creates a new copy of the process with a different tree.

        Args:
            tree: The tree to set for the new process

        Returns:
            A copy of the process with the tree modified.
        """
        # Create the copy
        result = copy(self)

        # Retree<commit_msg>Fixed typo and doc string<commit_after>"""Provides models for processes and process patches.
"""


# System imports
import warnings
from inspect import getsource
from copy import copy
from os.path import isfile

# Six imports
from six import string_types

# ROOT imports
from ROOT import TChain, TColor

# owls-hep imports
from owls_hep.expression import multiplied
from owls_hep.output import print_warning


# Set up default exports
__all__ = [
    'Patch',
    'Process',
]

class Patch(object):
    """A reusable process patch weighs/filters events according to an
    expression.
    """

    def __init__(self, selection):
        """Initializes a new instance of the Patch class.

        Args:
            selection: The selection expression to apply to the process data
        """
        self._selection = selection

    def state(self):
        """Returns a representation of the patch's internal state, if any.
        """
        return (self._selection,)

    def selection(self):
        """Returns the selection string for the patch.

        Returns:
            The selection string.
        """
        return self._selection


class Process(object):
    """Represents a physical process whose events may be encoded in one or more
    data files and which should be rendered according to a certain style.
    """

    def __init__(self,
                 files,
                 tree,
                 label,
                 line_color = 1,
                 fill_color = 0,
                 marker_style = None,
                 metadata = None):
        """Initializes a new instance of the Process class.

        Args:
            files: An iterable of ROOT file paths for files representing the
                process
            tree: The ROOT TTree path within the files to use
            label: The ROOT TLatex label string to use when rendering the
                process
            line_color: The ROOT TColor number or hex string (#rrggbb) to use
                as the line color when rendering the process
            fill_color: The ROOT TColor number or hex string (#rrggbb) to use
                as the fill color when rendering the process
            marker_style: The ROOT TMarker number to use as the marker style
                when rendering the process
            metadata: A (pickleable) object containing optional metadata
        """
        # Store parameters
        self._files = tuple(files)
        self._tree = tree
        self._label = label
        self._line_color = line_color
        self._fill_color = fill_color
        self._marker_style = marker_style
        self._metadata = metadata

        # Translate hex colors if necessary
        if isinstance(self._line_color, string_types):
            self._line_color = TColor.GetColor(self._line_color)
        if isinstance(self._fill_color, string_types):
            self._fill_color = TColor.GetColor(self._fill_color)

        # Create initial patches container
        self._patches = ()

    def __hash__(self):
        """Returns a hash for the process.
        """
        # Hash only files, tree, and patches since those are all that really
        # matter for data loading
        return hash((self._files, self._tree, self._patches))

    def metadata(self):
        """Returns the metadata for the process, if any.
        """
        return self._metadata

    def patches(self):
        """Returns an expression of patches for the process, if any.
        """
        return multiplied(*self._patches)

    # NOTE: We could instead return a list of TTrees/TFiles, because using
    # individual TFile/TTree objects might be slightly faster than creating
    # one huge TChain.
    def load(self):
        """Loads the process data.

        Returns:
            A TChain for the process.
        """

        chain = TChain(self._tree)
        for f in self._files:
            if not isfile(f):
                raise RuntimeError('file does not exist {0}'.format(f))
            chain.Add(f)

        # All done
        return chain

    def retreed(self, tree):
        """Creates a new copy of the process with a different tree.

        Args:
            tree: The tree to set for the new process

        Returns:
            A copy of the process with the tree modified.
        """
        # Create the copy
        result = copy(self)

        # Retree
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