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#
#  This program is free software; you can redistribute it and/or
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#  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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# <pep8-80 compliant>

# Originally written by Matt Ebb

import bpy
from bpy.types import Operator
import os


def guess_player_path(preset):
    import sys

    if preset == 'BLENDER24':
        player_path = "blender"

        if sys.platform == "darwin":
            test_path = "/Applications/blender 2.49.app/Contents/MacOS/blender"
        elif sys.platform[:3] == "win":
            test_path = "/Program Files/Blender Foundation/Blender/blender.exe"

            if os.path.exists(test_path):
                player_path = test_path

    elif preset == 'DJV':
        player_path = "djv_view"

        if sys.platform == "darwin":
            # TODO, crummy supporting only 1 version,
            # could find the newest installed version
            test_path = ("/Applications/djv-0.8.2.app"
                         "/Contents/Resources/bin/djv_view")
            if os.path.exists(test_path):
                player_path = test_path

    elif preset == 'FRAMECYCLER':
        player_path = "framecycler"

    elif preset == 'RV':
        player_path = "rv"

    elif preset == 'MPLAYER':
        player_path = "mplayer"

    else:
        player_path = ""

    return player_path


class PlayRenderedAnim(Operator):
    '''Plays back rendered frames/movies using an external player'''
    bl_idname = "render.play_rendered_anim"
    bl_label = "Play Rendered Animation"
    bl_options = {'REGISTER'}

    def execute(self, context):
        import subprocess

        scene = context.scene
        rd = scene.render
        prefs = context.user_preferences

        preset = prefs.filepaths.animation_player_preset
        player_path = prefs.filepaths.animation_player
        # file_path = bpy.path.abspath(rd.filepath)  # UNUSED
        is_movie = rd.is_movie_format

        # try and guess a command line if it doesn't exist
        if player_path == "":
            player_path = guess_player_path(preset)

        if is_movie == False and preset in {'FRAMECYCLER', 'RV', 'MPLAYER'}:
            # replace the number with '#'
            file_a = rd.frame_path(frame=0)

            # TODO, make an api call for this
            frame_tmp = 9
            file_b = rd.frame_path(frame=frame_tmp)

            while len(file_a) == len(file_b):
                frame_tmp = (frame_tmp * 10) + 9
                file_b = rd.frame_path(frame=frame_tmp)
            file_b = rd.frame_path(frame=int(frame_tmp / 10))

            file = ("".join((c if file_b[i] == c else "#")
                    for i, c in enumerate(file_a)))
        else:
            # works for movies and images
            file = rd.frame_path(frame=scene.frame_start)

        file = bpy.path.abspath(file)  # expand '//'

        cmd = [player_path]
        # extra options, fps controls etc.
        if preset == 'BLENDER24':
            # -----------------------------------------------------------------
            # Check blender is not 2.5x until it supports playback again
            try:
                process = subprocess.Popen([player_path, '--version'],
                                           stdout=subprocess.PIPE,
                                           )
            except:
                # ignore and allow the main execution to catch the problem.
                process = None

            if process is not None:
                process.wait()
                out = process.stdout.read()
                process.stdout.close()
                out_split = out.strip().split()
                if out_split[0] == b'Blender':
                    if not out_split[1].startswith(b'2.4'):
                        self.report({'ERROR'},
                                    "Blender %s doesn't support playback: %r" %
                                    (out_split[1].decode(), player_path))
                        return {'CANCELLED'}
                del out, out_split
            del process
            # -----------------------------------------------------------------

            opts = ["-a", "-f", str(rd.fps), str(rd.fps_base), file]
            cmd.extend(opts)
        elif preset == 'DJV':
            opts = [file, "-playback_speed", "%d" % int(rd.fps / rd.fps_base)]
            cmd.extend(opts)
        elif preset == 'FRAMECYCLER':
            opts = [file, "%d-%d" % (scene.frame_start, scene.frame_end)]
            cmd.extend(opts)
        elif preset == 'RV':
            opts = ["-fps", str(rd.fps), "-play", "[ %s ]" % file]
            cmd.extend(opts)
        elif preset == 'MPLAYER':
            opts = []
            if is_movie:
                opts.append(file)
            else:
                opts += [("mf://%s" % file.replace("#", "?")),
                         "-mf",
                         "fps=%.4f" % (rd.fps / rd.fps_base),
                         ]

            opts += ["-loop", "0", "-really-quiet", "-fs"]
            cmd.extend(opts)
        else:  # 'CUSTOM'
            cmd.append(file)

        # launch it
        print("Executing command:\n  %r" % " ".join(cmd))

        try:
            process = subprocess.Popen(cmd)
        except Exception as e:
            import traceback
            self.report({'ERROR'},
                        "Couldn't run external animation player with command "
                        "%r\n%s" % (" ".join(cmd), str(e)))
            return {'CANCELLED'}

        return {'FINISHED'}