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#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
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#
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#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
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#  along with this program; if not, write to the Free Software Foundation,
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# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

"""
This module contains utility functions specific to blender but
not assosiated with blenders internal data.
"""

import bpy as _bpy
import os as _os
import sys as _sys

from _bpy import blend_paths, user_resource
from _bpy import script_paths as _bpy_script_paths


def _test_import(module_name, loaded_modules):
    import traceback
    import time
    if module_name in loaded_modules:
        return None
    if "." in module_name:
        print("Ignoring '%s', can't import files containing multiple periods." % module_name)
        return None

    t = time.time()
    try:
        mod = __import__(module_name)
    except:
        traceback.print_exc()
        return None

    if _bpy.app.debug:
        print("time %s %.4f" % (module_name, time.time() - t))

    loaded_modules.add(mod.__name__)  # should match mod.__name__ too
    return mod


def _sys_path_ensure(path):
    if path not in _sys.path:  # reloading would add twice
        _sys.path.insert(0, path)


def modules_from_path(path, loaded_modules):
    """
    Load all modules in a path and return them as a list.

    :arg path: this path is scanned for scripts and packages.
    :type path: string
    :arg loaded_modules: already loaded module names, files matching these names will be ignored.
    :type loaded_modules: set
    :return: all loaded modules.
    :rtype: list
    """
    import traceback
    import time

    modules = []

    for mod_name, mod_path in _bpy.path.module_names(path):
        mod = _test_import(mod_name, loaded_modules)
        if mod:
            modules.append(mod)

    return modules


_global_loaded_modules = []  # store loaded module names for reloading.
import bpy_types as _bpy_types  # keep for comparisons, never ever reload this.


def load_scripts(reload_scripts=False, refresh_scripts=False):
    """
    Load scripts and run each modules register function.

    :arg reload_scripts: Causes all scripts to have their unregister method called before loading.
    :type reload_scripts: bool
    :arg refresh_scripts: only load scripts which are not already loaded as modules.
    :type refresh_scripts: bool
    """
    import traceback
    import time

    # must be set back to True on exits
    _bpy_types._register_immediate = False

    t_main = time.time()

    loaded_modules = set()

    if refresh_scripts:
        original_modules = _sys.modules.values()

    if reload_scripts:
        _bpy_types.TypeMap.clear()
        _bpy_types.PropertiesMap.clear()

        # just unload, dont change user defaults, this means we can sync to reload.
        # note that they will only actually reload of the modification time changes.
        # this `wont` work for packages so... its not perfect.
        for module_name in [ext.module for ext in _bpy.context.user_preferences.addons]:
            addon_disable(module_name, default_set=False)

    def register_module_call(mod):
        _bpy_types._register_module(mod.__name__)
        register = getattr(mod, "register", None)
        if register:
            try:
                register()
            except:
                traceback.print_exc()
        else:
            print("\nWarning! '%s' has no register function, this is now a requirement for registerable scripts." % mod.__file__)

    def unregister_module_call(mod):
        _bpy_types._unregister_module(mod.__name__)
        unregister = getattr(mod, "unregister", None)
        if unregister:
            try:
                unregister()
            except:
                traceback.print_exc()

    def test_reload(mod):
        # reloading this causes internal errors
        # because the classes from this module are stored internally
        # possibly to refresh internal references too but for now, best not to.
        if mod == _bpy_types:
            return mod

        try:
            return reload(mod)
        except:
            traceback.print_exc()

    def test_register(mod):

        if refresh_scripts and mod in original_modules:
            return

        if reload_scripts and mod:
            print("Reloading:", mod)
            mod = test_reload(mod)

        if mod:
            register_module_call(mod)
            _global_loaded_modules.append(mod.__name__)

    if reload_scripts:

        # module names -> modules
        _global_loaded_modules[:] = [_sys.modules[mod_name] for mod_name in _global_loaded_modules]

        # loop over and unload all scripts
        _global_loaded_modules.reverse()
        for mod in _global_loaded_modules:
            unregister_module_call(mod)

        for mod in _global_loaded_modules:
            test_reload(mod)

        _global_loaded_modules[:] = []

    user_path = user_script_path()

    for base_path in script_paths():
        for path_subdir in ("", "ui", "op", "io", "keyingsets", "modules"):
            path = _os.path.join(base_path, path_subdir)
            if _os.path.isdir(path):
                _sys_path_ensure(path)

                # only add this to sys.modules, dont run
                if path_subdir == "modules":
                    continue

                if user_path != base_path and path_subdir == "":
                    continue  # avoid loading 2.4x scripts

                for mod in modules_from_path(path, loaded_modules):
                    test_register(mod)

    _bpy_types._register_immediate = True

    # deal with addons seperately
    addon_reset_all()


    # run the active integration preset
    filepath = preset_find(_bpy.context.user_preferences.inputs.active_keyconfig, "keyconfig")
    if filepath:
        keyconfig_set(filepath)


    if reload_scripts:
        import gc
        print("gc.collect() -> %d" % gc.collect())

    if _bpy.app.debug:
        print("Python Script Load Time %.4f" % (time.time() - t_main))


# base scripts
_scripts = _os.path.join(_os.path.dirname(__file__), _os.path.pardir, _os.path.pardir)
_scripts = (_os.path.normpath(_scripts), )


def user_script_path():
    path = _bpy.context.user_preferences.filepaths.script_directory

    if path:
        path = _os.path.normpath(path)
        return path
    else:
        return None


def script_paths(subdir=None, user=True):
    """
    Returns a list of valid script paths from the home directory and user preferences.

    Accepts any number of string arguments which are joined to make a path.
    """
    scripts = list(_scripts)

    # add user scripts dir
    if user:
        user_script_path = _bpy.context.user_preferences.filepaths.script_directory
    else:
        user_script_path = None

    for path in _bpy_script_paths() + (user_script_path, ):
        if path:
            path = _os.path.normpath(path)
            if path not in scripts and _os.path.isdir(path):
                scripts.append(path)

    if not subdir:
        return scripts

    script_paths = []
    for path in scripts:
        path_subdir = _os.path.join(path, subdir)
        if _os.path.isdir(path_subdir):
            script_paths.append(path_subdir)

    return script_paths


_presets = _os.path.join(_scripts[0], "presets")  # FIXME - multiple paths


def preset_paths(subdir):
    """
    Returns a list of paths for a specific preset.
    """
    dirs = []
    for path in script_paths("presets"):
        directory = _os.path.join(path, subdir)
        if _os.path.isdir(directory):
            dirs.append(directory)
    return dirs


def smpte_from_seconds(time, fps=None):
    """
    Returns an SMPTE formatted string from the time in seconds: "HH:MM:SS:FF".

    If the *fps* is not given the current scene is used.
    """
    import math

    if fps is None:
        fps = _bpy.context.scene.render.fps

    hours = minutes = seconds = frames = 0

    if time < 0:
        time = - time
        neg = "-"
    else:
        neg = ""

    if time >= 3600.0:  # hours
        hours = int(time / 3600.0)
        time = time % 3600.0
    if time >= 60.0:  # mins
        minutes = int(time / 60.0)
        time = time % 60.0

    seconds = int(time)
    frames = int(round(math.floor(((time - seconds) * fps))))

    return "%s%02d:%02d:%02d:%02d" % (neg, hours, minutes, seconds, frames)


def smpte_from_frame(frame, fps=None, fps_base=None):
    """
    Returns an SMPTE formatted string from the frame: "HH:MM:SS:FF".

    If *fps* and *fps_base* are not given the current scene is used.
    """

    if fps is None:
        fps = _bpy.context.scene.render.fps

    if fps_base is None:
        fps_base = _bpy.context.scene.render.fps_base

    return smpte_from_seconds((frame * fps_base) / fps, fps)


def addon_check(module_name):
    """
    Returns the loaded state of the addon.

    :arg module_name: The name of the addon and module.
    :type module_name: string
    :return: (loaded_default, loaded_state)
    :rtype: tuple of booleans
    """
    loaded_default = module_name in _bpy.context.user_preferences.addons

    mod = _sys.modules.get(module_name)
    loaded_state = mod and getattr(mod, "__addon_enabled__", Ellipsis)

    if loaded_state is Ellipsis:
        print("Warning: addon-module %r found module but without"
               " __addon_enabled__ field, possible name collision from file: %r" %
               (module_name, getattr(mod, "__file__", "<unknown>")))

        loaded_state = False

    return loaded_default, loaded_state


def addon_enable(module_name, default_set=True):
    """
    Enables an addon by name.

    :arg module_name: The name of the addon and module.
    :type module_name: string
    :return: the loaded module or None on failier.
    :rtype: module
    """
    # note, this still gets added to _bpy_types.TypeMap

    import os
    import sys
    import bpy_types as _bpy_types


    _bpy_types._register_immediate = False

    def handle_error():
        import traceback
        traceback.print_exc()
        _bpy_types._register_immediate = True


    # reload if the mtime changes
    mod = sys.modules.get(module_name)
    if mod:
        mod.__addon_enabled__ = False
        mtime_orig = getattr(mod, "__time__", 0)
        mtime_new = os.path.getmtime(mod.__file__)
        if mtime_orig != mtime_new:
            print("module changed on disk:", mod.__file__, "reloading...")

            try:
                reload(mod)
            except:
                handle_error()
                del sys.modules[module_name]
                return None
            mod.__addon_enabled__ = False

    # Split registering up into 3 steps so we can undo if it fails par way through
    # 1) try import
    try:
        mod = __import__(module_name)
        mod.__time__ = os.path.getmtime(mod.__file__)
        mod.__addon_enabled__ = False
    except:
        handle_error()
        return None

    # 2) try register collected modules
    try:
        _bpy_types._register_module(module_name)
    except:
        handle_error()
        del sys.modules[module_name]
        return None

    # 3) try run the modules register function
    try:
        mod.register()
    except:
        handle_error()
        _bpy_types._unregister_module(module_name)
        del sys.modules[module_name]
        return None

    # * OK loaded successfully! *
    if default_set:
        # just incase its enabled alredy
        ext = _bpy.context.user_preferences.addons.get(module_name)
        if not ext:
            ext = _bpy.context.user_preferences.addons.new()
            ext.module = module_name
    
    _bpy_types._register_immediate = True

    mod.__addon_enabled__ = True

    print("\tbpy.utils.addon_enable", mod.__name__)

    return mod


def addon_disable(module_name, default_set=True):
    """
    Disables an addon by name.

    :arg module_name: The name of the addon and module.
    :type module_name: string
    """
    import traceback
    import bpy_types as _bpy_types

    mod = _sys.modules.get(module_name)

    # possible this addon is from a previous session and didnt load a module this time.
    # so even if the module is not found, still disable the addon in the user prefs.
    if mod:
        mod.__addon_enabled__ = False

        try:
            _bpy_types._unregister_module(module_name, free=False)  # dont free because we may want to enable again.
            mod.unregister()
        except:
            traceback.print_exc()
    else:
        print("addon_disable", module_name, "not loaded")

    # could be in more then once, unlikely but better do this just incase.
    addons = _bpy.context.user_preferences.addons

    if default_set:
        while module_name in addons:
            addon = addons.get(module_name)
            if addon:
                addons.remove(addon)
    
    print("\tbpy.utils.addon_disable", module_name)


def addon_reset_all():
    """
    Sets the addon state based on the user preferences.
    """
    
    # RELEASE SCRIPTS: official scripts distributed in Blender releases
    paths = script_paths("addons")
    
    # CONTRIB SCRIPTS: good for testing but not official scripts yet
    paths += script_paths("addons_contrib")
    
    # EXTERN SCRIPTS: external projects scripts
    paths += script_paths("addons_extern")

    for path in paths:
        _sys_path_ensure(path)
        for mod_name, mod_path in _bpy.path.module_names(path):
            is_enabled, is_loaded = addon_check(mod_name)
            if is_enabled == is_loaded:
                pass
            elif is_enabled:
                addon_enable(mod_name)
            elif is_loaded:
                print("\taddon_reset_all unloading", mod_name)
                addon_disable(mod_name)

def preset_find(name, preset_path, display_name=False):
    if not name:
        return None
    
    for directory in preset_paths(preset_path):
        
        if display_name:
            filename = ""
            for fn in _os.listdir(directory):
                if fn.endswith(".py") and name == _bpy.path.display_name(fn):
                    filename = fn
                    break
        else:
            filename = name + ".py"

        if filename:
            filepath = _os.path.join(directory, filename)
            if _os.path.exists(filepath):
                return filepath


def keyconfig_set(filepath):
    from os.path import basename, splitext

    print("loading preset:", filepath)
    keyconfigs = _bpy.context.window_manager.keyconfigs
    kc_orig = keyconfigs.active

    keyconfigs_old = keyconfigs[:]

    try:
        exec(compile(open(filepath).read(), filepath, 'exec'), {"__file__": filepath})
    except:
        import traceback
        traceback.print_exc()

    kc_new = [kc for kc in keyconfigs if kc not in keyconfigs_old][0]

    kc_new.name = ""

    # remove duplicates
    name = splitext(basename(filepath))[0]
    while True:
        kc_dupe = keyconfigs.get(name)
        if kc_dupe:
            keyconfigs.remove(kc_dupe)
        else:
            break
    
    kc_new.name = name
    keyconfigs.active = kc_new