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#!/usr/bin/python
# -*- coding: latin1 -*-

### Copyright (C) 2011 Damon Lynch <damonlynch@gmail.com>

### 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 of the License, or
### (at your option) any later version.

### This program is distributed in the hope that it will be useful,
### 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.

### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software
### Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import os
import multiprocessing
import re

import gio
import gtk

import pyexiv2

import rpdmultiprocessing as rpdmp
import rpdfile
import prefsrapid


import logging
logger = multiprocessing.get_logger()

# python whitespace is significant - don't remove the leading whitespace on
# the second line

file_attributes = "standard::name,standard::display-name,\
standard::type,standard::size,time::modified,access::can-read,id::file"


def get_video_THM_file(full_file_name_no_ext):
    """
    Checks to see if a thumbnail file (THM) is in the same directory as the 
    file. Expects a full path to be part of the file name.
    
    Returns the filename, including path, if found, else returns None.
    """
    
    f = None
    for e in rpdfile.VIDEO_THUMBNAIL_EXTENSIONS:
        if os.path.exists(full_file_name_no_ext + '.' + e):
            f = full_file_name_no_ext + '.' + e
            break
        if os.path.exists(full_file_name_no_ext + '.' + e.upper()):
            f = full_file_name_no_ext + '.' + e.upper()
            break
        
    return f 

class Scan(multiprocessing.Process):

    """Scans the given path for files of a specified type.
    
    Returns results in batches, finishing with a total of the size of all the
    files in bytes.
    """
    
    def __init__(self, path, ignored_paths, use_re_ignored_paths,
                 batch_size, results_pipe, 
                 terminate_queue, run_event):
                     
        """Setup values needed to conduct the scan.
        
        'path' is a string of the path to be scanned, which is passed to gio.
        
        'ignored_paths' is a list of paths that should not be scanned. Any path
        ending with one of the values will be ignored.
        
        'use_re_ignored_paths': if true, pytho regular expressions will be used
        to determine which paths to ignore
        
        'batch_size' is the number of files that should be sent back to the 
        calling function at one time.
        
        'results_pipe' is a connection on which to send the results.
        
        'terminate_queue' is a queue whose sole purpose is to notify the 
        process that it should terminate and not return any results.
        
        'run_event' is an Event that is used to temporarily halt execution.
        
        """
        
        multiprocessing.Process.__init__(self)
        self.path = path
        self.ignored_paths = ignored_paths
        self.use_re_ignored_paths = use_re_ignored_paths
        self.results_pipe = results_pipe
        self.terminate_queue = terminate_queue
        self.run_event = run_event
        self.batch_size = batch_size
        self.counter = 0
        self.files = []
        self.file_type_counter = rpdfile.FileTypeCounter()
        
    def _gio_scan(self, path, file_size_sum):
        """recursive function to scan a directory and its subdirectories
        for photos and possibly videos"""
        
        children = path.enumerate_children(file_attributes)
        
        for child in children:
            
            # pause if instructed by the caller
            self.run_event.wait()
            
            if not self.terminate_queue.empty():
                x = self.terminate_queue.get()
                # terminate immediately
                logger.info("terminating scan...")
                self.files = []
                return None

            # only collect files and scan in directories we can actually read
            # cannot assume that users will download only from memory cards
            
            if child.get_attribute_boolean(gio.FILE_ATTRIBUTE_ACCESS_CAN_READ):
                file_type = child.get_file_type()
                name = child.get_name()
                if file_type == gio.FILE_TYPE_DIRECTORY:
                    if not self.ignore_this_path(name):
                        file_size_sum = self._gio_scan(path.get_child(name), 
                                                   file_size_sum)
                    if file_size_sum is None:
                        return None

                elif file_type == gio.FILE_TYPE_REGULAR:
                    base_name, ext = os.path.splitext(name)
                    ext = ext.lower()[1:]
                    
                    file_type = rpdfile.file_type(ext)
                    if file_type is not None:
                        file_id = child.get_attribute_string(
                                                gio.FILE_ATTRIBUTE_ID_FILE)
                        if file_id is not None:
                            # count how many files of each type are included
                            # e.g. photo, video
                            self.file_type_counter.add(file_type)
                            self.counter += 1
                            display_name = child.get_display_name()
                            size = child.get_size()
                            modification_time = child.get_modification_time()
                            path_name = path.get_path()
                            
                            # look for thumbnail file for videos
                            if file_type == rpdfile.FILE_TYPE_VIDEO:
                                thm_full_name = get_video_THM_file(os.path.join(path_name, base_name))
                            else:
                                thm_full_name = None
                                
                            scanned_file = rpdfile.get_rpdfile(ext, 
                                             name, 
                                             display_name, 
                                             path_name,
                                             size,
                                             modification_time,
                                             thm_full_name, 
                                             self.pid,
                                             file_id,
                                             file_type)
                                         
                            self.files.append(scanned_file)
                        
                            if self.counter == self.batch_size:
                                # send batch of results
                                self.results_pipe.send((rpdmp.CONN_PARTIAL, 
                                                        self.files))
                                self.files = []
                                self.counter = 0
                            
                            file_size_sum += size

        return file_size_sum
        

    def run(self):
        """start the actual scan."""
        
        if self.use_re_ignored_paths and len(self.ignored_paths):
            self.re_pattern = prefsrapid.check_and_compile_re(self.ignored_paths)
        
        source = gio.File(self.path)
        try:
            if not self.ignore_this_path(self.path):
                size = self._gio_scan(source, 0)
            else:
                size = None
        except gio.Error, inst:
            logger.error("Error while scanning %s: %s", self.path, inst)
            size = None
            
        if size is not None:
            if self.counter > 0:
                # send any remaining results
                self.results_pipe.send((rpdmp.CONN_PARTIAL, self.files))
            self.results_pipe.send((rpdmp.CONN_COMPLETE, (size, 
                                    self.file_type_counter, self.pid)))
            self.results_pipe.close()                

    def ignore_this_path(self, path):
        """
        determines if the path should be ignored according to the preferences
        chosen by the user
        """
        
        if len(self.ignored_paths):
            if self.use_re_ignored_paths and self.re_pattern:
                # regular expressions are being used
                if self.re_pattern.match(path):
                    return True
            else:
                # regular expressions are not being used
                if path.endswith(tuple(self.ignored_paths)):
                    return True
                    
        return False