import os
import sys
import re
import contextlib

from openpype.lib import Logger
from openpype.client import (
    get_asset_by_name,
    get_subset_by_name,
    get_last_version_by_subset_id,
    get_representation_by_id,
    get_representation_by_name,
    get_representation_parents,
)
from openpype.pipeline import (
    switch_container,
    legacy_io,
)
from openpype.pipeline.context_tools import get_current_project_asset

self = sys.modules[__name__]
self._project = None


def update_frame_range(start, end, comp=None, set_render_range=True,
                       handle_start=0, handle_end=0):
    """Set Fusion comp's start and end frame range

    Args:
        start (float, int): start frame
        end (float, int): end frame
        comp (object, Optional): comp object from fusion
        set_render_range (bool, Optional): When True this will also set the
            composition's render start and end frame.
        handle_start (float, int, Optional): frame handles before start frame
        handle_end (float, int, Optional): frame handles after end frame

    Returns:
        None

    """

    if not comp:
        comp = get_current_comp()

    # Convert any potential none type to zero
    handle_start = handle_start or 0
    handle_end = handle_end or 0

    attrs = {
        "COMPN_GlobalStart": start - handle_start,
        "COMPN_GlobalEnd": end + handle_end
    }

    # set frame range
    if set_render_range:
        attrs.update({
            "COMPN_RenderStart": start,
            "COMPN_RenderEnd": end
        })

    with comp_lock_and_undo_chunk(comp):
        comp.SetAttrs(attrs)


def set_asset_framerange():
    """Set Comp's frame range based on current asset"""
    asset_doc = get_current_project_asset()
    start = asset_doc["data"]["frameStart"]
    end = asset_doc["data"]["frameEnd"]
    handle_start = asset_doc["data"]["handleStart"]
    handle_end = asset_doc["data"]["handleEnd"]
    update_frame_range(start, end, set_render_range=True,
                       handle_start=handle_start,
                       handle_end=handle_end)


def set_asset_resolution():
    """Set Comp's resolution width x height default based on current asset"""
    asset_doc = get_current_project_asset()
    width = asset_doc["data"]["resolutionWidth"]
    height = asset_doc["data"]["resolutionHeight"]
    comp = get_current_comp()

    print("Setting comp frame format resolution to {}x{}".format(width,
                                                                 height))
    comp.SetPrefs({
        "Comp.FrameFormat.Width": width,
        "Comp.FrameFormat.Height": height,
    })


def validate_comp_prefs(comp=None, force_repair=False):
    """Validate current comp defaults with asset settings.

    Validates fps, resolutionWidth, resolutionHeight, aspectRatio.

    This does *not* validate frameStart, frameEnd, handleStart and handleEnd.
    """

    if comp is None:
        comp = get_current_comp()

    log = Logger.get_logger("validate_comp_prefs")

    fields = [
        "name",
        "data.fps",
        "data.resolutionWidth",
        "data.resolutionHeight",
        "data.pixelAspect"
    ]
    asset_doc = get_current_project_asset(fields=fields)
    asset_data = asset_doc["data"]

    comp_frame_format_prefs = comp.GetPrefs("Comp.FrameFormat")

    # Pixel aspect ratio in Fusion is set as AspectX and AspectY so we convert
    # the data to something that is more sensible to Fusion
    asset_data["pixelAspectX"] = asset_data.pop("pixelAspect")
    asset_data["pixelAspectY"] = 1.0

    validations = [
        ("fps", "Rate", "FPS"),
        ("resolutionWidth", "Width", "Resolution Width"),
        ("resolutionHeight", "Height", "Resolution Height"),
        ("pixelAspectX", "AspectX", "Pixel Aspect Ratio X"),
        ("pixelAspectY", "AspectY", "Pixel Aspect Ratio Y")
    ]

    invalid = []
    for key, comp_key, label in validations:
        asset_value = asset_data[key]
        comp_value = comp_frame_format_prefs.get(comp_key)
        if asset_value != comp_value:
            invalid_msg = "{} {} should be {}".format(label,
                                                      comp_value,
                                                      asset_value)
            invalid.append(invalid_msg)

            if not force_repair:
                # Do not log warning if we force repair anyway
                log.warning(
                    "Comp {pref} {value} does not match asset "
                    "'{asset_name}' {pref} {asset_value}".format(
                        pref=label,
                        value=comp_value,
                        asset_name=asset_doc["name"],
                        asset_value=asset_value)
                )

    if invalid:

        def _on_repair():
            attributes = dict()
            for key, comp_key, _label in validations:
                value = asset_data[key]
                comp_key_full = "Comp.FrameFormat.{}".format(comp_key)
                attributes[comp_key_full] = value
            comp.SetPrefs(attributes)

        if force_repair:
            log.info("Applying default Comp preferences..")
            _on_repair()
            return

        from . import menu
        from openpype.widgets import popup
        from openpype.style import load_stylesheet
        dialog = popup.Popup(parent=menu.menu)
        dialog.setWindowTitle("Fusion comp has invalid configuration")

        msg = "Comp preferences mismatches '{}'".format(asset_doc["name"])
        msg += "\n" + "\n".join(invalid)
        dialog.setMessage(msg)
        dialog.setButtonText("Repair")
        dialog.on_clicked.connect(_on_repair)
        dialog.show()
        dialog.raise_()
        dialog.activateWindow()
        dialog.setStyleSheet(load_stylesheet())


def switch_item(container,
                asset_name=None,
                subset_name=None,
                representation_name=None):
    """Switch container asset, subset or representation of a container by name.

    It'll always switch to the latest version - of course a different
    approach could be implemented.

    Args:
        container (dict): data of the item to switch with
        asset_name (str): name of the asset
        subset_name (str): name of the subset
        representation_name (str): name of the representation

    Returns:
        dict

    """

    if all(not x for x in [asset_name, subset_name, representation_name]):
        raise ValueError("Must have at least one change provided to switch.")

    # Collect any of current asset, subset and representation if not provided
    #   so we can use the original name from those.
    project_name = legacy_io.active_project()
    if any(not x for x in [asset_name, subset_name, representation_name]):
        repre_id = container["representation"]
        representation = get_representation_by_id(project_name, repre_id)
        repre_parent_docs = get_representation_parents(representation)
        if repre_parent_docs:
            version, subset, asset, _ = repre_parent_docs
        else:
            version = subset = asset = None

        if asset_name is None:
            asset_name = asset["name"]

        if subset_name is None:
            subset_name = subset["name"]

        if representation_name is None:
            representation_name = representation["name"]

    # Find the new one
    asset = get_asset_by_name(project_name, asset_name, fields=["_id"])
    assert asset, ("Could not find asset in the database with the name "
                   "'%s'" % asset_name)

    subset = get_subset_by_name(
        project_name, subset_name, asset["_id"], fields=["_id"]
    )
    assert subset, ("Could not find subset in the database with the name "
                    "'%s'" % subset_name)

    version = get_last_version_by_subset_id(
        project_name, subset["_id"], fields=["_id"]
    )
    assert version, "Could not find a version for {}.{}".format(
        asset_name, subset_name
    )

    representation = get_representation_by_name(
        project_name, representation_name, version["_id"]
    )
    assert representation, ("Could not find representation in the database "
                            "with the name '%s'" % representation_name)

    switch_container(container, representation)

    return representation


@contextlib.contextmanager
def maintained_selection():
    comp = get_current_comp()
    previous_selection = comp.GetToolList(True).values()
    try:
        yield
    finally:
        flow = comp.CurrentFrame.FlowView
        flow.Select()  # No args equals clearing selection
        if previous_selection:
            for tool in previous_selection:
                flow.Select(tool, True)


def get_frame_path(path):
    """Get filename for the Fusion Saver with padded number as '#'

    >>> get_frame_path("C:/test.exr")
    ('C:/test', 4, '.exr')

    >>> get_frame_path("filename.00.tif")
    ('filename.', 2, '.tif')

    >>> get_frame_path("foobar35.tif")
    ('foobar', 2, '.tif')

    Args:
        path (str): The path to render to.

    Returns:
        tuple: head, padding, tail (extension)

    """
    filename, ext = os.path.splitext(path)

    # Find a final number group
    match = re.match('.*?([0-9]+)$', filename)
    if match:
        padding = len(match.group(1))
        # remove number from end since fusion
        # will swap it with the frame number
        filename = filename[:-padding]
    else:
        padding = 4  # default Fusion padding

    return filename, padding, ext


def get_fusion_module():
    """Get current Fusion instance"""
    fusion = getattr(sys.modules["__main__"], "fusion", None)
    return fusion


def get_current_comp():
    """Get current comp in this session"""
    fusion = get_fusion_module()
    if fusion:
        comp = fusion.CurrentComp
        return comp


@contextlib.contextmanager
def comp_lock_and_undo_chunk(comp, undo_queue_name="Script CMD"):
    """Lock comp and open an undo chunk during the context"""
    try:
        comp.Lock()
        comp.StartUndo(undo_queue_name)
        yield
    finally:
        comp.Unlock()
        comp.EndUndo()