#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# (c) 2010 by Ingo Weinzierl <ingo.weinzierl@intevation.de>
# (c) 2011 by Björn Ricks <bjoern.ricks@intevation.de>
#
# A python worklog-alike to log what you have 'getan' (done).
#
# This is Free Software licensed under the terms of GPLv3 or later.
# For details see LICENSE coming with the source of 'getan'.
#

import logging
import sys
from   datetime import datetime
from optparse import OptionParser

import getan.config  as config
from   getan.backend import *
from   getan.view    import *
from   getan.utils   import format_time

logger = logging.getLogger()

class GetanController:
    def __init__(self, backend, pv_class, ev_class):
        self.ev_class = ev_class
        self.pv_class = pv_class

        self.projects = backend.load_projects()
        if self.projects:
            entries = backend.load_entries(self.projects[0].id)
        else:
            entries = []
        self.running  = []

        self.backend      = backend
        self.project_view = pv_class(self, self.projects)
        self.entries_view = ev_class(entries)

        self.view  = GetanView(self, self.project_view, self.entries_view)
        self.state = PausedProjectsState(self, self.project_view)

    def main(self):
        self.view.run()

    def unhandled_keypress(self, key):
        self.state = self.state.keypress(key)

    def input_filter(self, input, raw_input):
        if 'window resize' in input:
            self.view.loop.screen_size = None
            self.view.loop.draw_screen()
        else:
            self.state = self.state.keypress(input)

    def update_entries(self, project):
        logger.debug("GetanController: update entries.")
        if project: entries = self.backend.load_entries(project.id)
        else:       entries = []
        self.entries_view.set_rows(entries)
        self.view.update_view()

    def move_selected_entries(self, project):
        old_project = None
        entries = []
        try:
            while self.entries_view.selection:
                node = self.entries_view.selection.pop()
                if node.selected: node.select()
                entries.append(node.item)
                logger.info("GetanController: move entry '%s' (id = %d, "\
                            "project id = %d) to project '%s'"
                            % (node.item.desc, node.item.id,
                               node.item.project_id, project.desc))

                if not old_project:
                    old_project = self.project_by_id(node.item.project_id)
        finally:
            self.backend.move_entries(entries, project.id)
            if not old_project: return
            project.entries     = self.backend.load_entries(project.id)
            old_project.entries = self.backend.load_entries(old_project.id)
            self.update_entries(old_project)
            self.project_view.update_all()

    def delete_entries(self, entry_nodes):
        if not entry_nodes: return
        proj    = None
        entries = []
        try:
            while self.entries_view.selection:
                node = self.entries_view.selection.pop()
                if node.selected: node.select()
                entries.append(node.item)
                logger.info("GetanController: delete entry '%s' (id = %d, "\
                            "project id = %d)"
                            % (node.item.desc, node.item.id,
                               node.item.project_id))

                if proj is None:
                    proj = self.project_by_id(node.item.project_id)
        finally:
            self.backend.delete_entries(entries)
            proj.entries = self.backend.load_entries(proj.id)
            self.update_entries(proj)
            self.project_view.update()

    def update_project_list(self):
        self.project_view.update()
        self.view.update_view()

    def exit(self):
        self.view.exit()

    def project_by_key(self, key):
        for proj in self.projects:
            if proj.key == key:
                return proj
        return None

    def project_by_id(self, id):
        for proj in self.projects:
            if proj.id == id:
                return proj
        return None

    def start_project(self, project):
        if not project: return
        self.running.append(project)
        project.start = datetime.now()
        logger.info("Start project '%s' at %s."
                    % (project.desc, format_time(datetime.now())))
        self.view.set_footer_text(" Running on '%s'" % project.desc, 'running')
        logger.debug('All running projects: %r' % self.running)

    def stop_project(self, desc='-no description-', display=True):
        if not self.running: return
        project = self.running.pop()
        if not project: return
        logger.info("Stop project '%s' at %s."
                    % (project.desc, format_time(datetime.now())))
        project.stop = datetime.now()
        self.backend.insert_project_entry(project, datetime.now(), desc)
        if display:
            self.update_entries(project)
            self.update_project_list()
        logger.debug('Still running projects: %r' % self.running)

    def add_project(self, key, description):
        if not key or not description:
            return
        self.backend.insert_project(key, description)
        self.update_project_list()

    def update_entry(self, entry):
        self.backend.update_entry(entry)

    def shutdown(self):
        for project in self.running:
            self.stop_project(display=False)


def main():

    usage = "usage: %prog [options] [databasefile (default: " + \
             DEFAULT_DATABASE + ")]"
    parser = OptionParser(usage=usage)
    parser.add_option("-d", "--debug", action="store_true", dest="debug",
                      help="Set verbosity to debug")
    parser.add_option("-l", "--logfile", dest="logfile", metavar="FILE",
                      help="Write log information to FILE [default: %default]",
                      default="getan.log")
    (options, args) = parser.parse_args()
    logargs = dict()
    if options.debug:
        logargs["level"] = logging.DEBUG
    if options.logfile:
        logargs["filename"] = options.logfile
    config.initialize(**logargs)
    global logger

    if len(args) > 0:
        backend = Backend(args[0])
        logging.info("Use database '%s'." % args[0])
    else:
        backend = Backend()
        logging.info("Use database '%s'." % DEFAULT_DATABASE)

    controller = GetanController(backend, ProjectList, EntryList)

    try:
        controller.main()
    except KeyboardInterrupt:
        pass
    finally:
        controller.shutdown()


if __name__ == '__main__':
    main()