"""Interactive python shell with port_stats

What's in the box:

- load() -- (re)loads the task and packages information
- use(repo) -- switch to using <repo>
- load(repo) -- load stuff and start using the given repo instead of default
- pt(name) -- prints information about the package tasks
- spt(name) -- prints information about the package tasks, short version
- spi(name) -- prints the short package information
- gspi(pattern) -- prints the short package information for
  all the packages with name matching pattern ('g' for 'grep')
- list_spi(pkgs_list) -- same as gspi, but for python lists
  of strings instead of patterns
- ti(num) -- prints information about the task #num
- fti(num) -- prints information about the task #num, full version (a dict)
- logs(num, [idx]) -- print logs (logs/events.X.Y.log) for task #num
- next_tasks() -- display all non-done tasks that would update packages
- stats() -- prints packages statistics

You can also enjoy autocompletion with <TAB>.
"""

from __future__ import print_function

import atexit
import json
import logging
import os
import re
import readline
import sys

from pydoc import pager

from port_stats import colorize
from port_stats import lists
from port_stats import logs as m_logs
from port_stats import reports
from port_stats import task_predicates as tp
from port_stats import tasks
from port_stats import utils


LOG = logging.getLogger('port_stats.interactive')


def get_task(taskid, task_dict):
    try:
        return task_dict[int(taskid)]
    except Exception:
        raise ValueError('Task not found: %s' % taskid)


def package_tasks(pkg, data):
    ts = sorted(data[pkg], key=lambda t: int(t['taskid']))
    return '\n'.join(tasks.format_task(t) for t in ts)


# {{{ to= targets

def dump(string):
    print(string)


def append_to(filename):
    def _write(string):
        if os.path.exists(filename):
            LOG.info('File %s already exists, appending', filename)
        with open(filename, 'a') as f:
            f.write(string)
            f.write('\n')
    return _write


# }}}

# The Interactive Part

CONFIG = None
CURRENT = None
REPOS = {}
TASKS = {}
PACKAGE_TASKS = {}
BY_NAME = {}
BY_COLOR = {}


def repo_tasks(task_dict=None):
    for _, t in sorted(TASKS.iteritems()):
        if t['repo'] == CURRENT['new']:
            yield t


def use(repo=None):
    global PACKAGE_TASKS, BY_NAME, BY_COLOR, CURRENT
    if repo is not None:
        try:
            CURRENT = (c for c in CONFIG['colorize']
                       if c['name'] == repo).next()
        except StopIteration:
            raise ValueError('Unknown repo: ' + repo)
    elif CURRENT is None:
        CURRENT = CONFIG['colorize'][0]
    LOG.info("Updating data structures for  %s...", CURRENT['name'])
    sys.ps1 = CURRENT['name'] + '>>> '
    PACKAGE_TASKS = tasks.tasks_by_package(repo_tasks())
    BY_NAME, BY_COLOR = colorize.colorize(REPOS[CURRENT['base']],
                                          REPOS[CURRENT['new']])
    LOG.info("DONE")


def load(repo=None):
    global TASKS, REPOS
    TASKS = dict((t['taskid'], t)
                 for t in tasks.load_tasks(CONFIG['tasks'], cache=TASKS))
    REPOS = lists.read_all_srclists(CONFIG['repos'])
    LOG.info("Got %s tasks, %s repositories", len(TASKS), len(REPOS))
    for name in sorted(REPOS):
        LOG.info("  %s: %s srpms", name, len(REPOS[name]))
    use(repo)


def pt(pkg, to=print):
    to(package_tasks(pkg, PACKAGE_TASKS))


def spt(pkg, to=print):
    to(tasks.format_tasks_short(PACKAGE_TASKS.get(pkg)))


def spi(pkg, to=print):
    to(reports.package_one_line(pkg, BY_NAME, PACKAGE_TASKS))


def _spi_by_predicate(pred, colors):
    colors = colors or colorize.COLORS
    return '\n'.join(
        reports.package_one_line(name, BY_NAME, PACKAGE_TASKS)
        for name in sorted(BY_NAME)
        if pred(name) and BY_NAME[name][0] in colors)


def gspi(pattern, colors=None, to=print):
    p = re.compile(pattern)
    to(_spi_by_predicate(p.search, colors))


def list_spi(pkgs, colors=None, to=print):
    pset = frozenset(pkgs)
    lines = _spi_by_predicate(pset.__contains__, colors)
    unknown = pset - frozenset(BY_NAME)
    if unknown:
        lines += "\nNot in repos:\n\t" + "\n\t".join(sorted(unknown))
    to(lines)


def ti(num, to=print):
    to(reports.format_colored_task(get_task(num, TASKS), BY_NAME))


def display_tasks(infos, include=None, exclude=None, to=pager):
    tasks = (reports.format_colored_task(t, BY_NAME) for t in infos)
    if include:
        p = re.compile(include)
        tasks = (t for t in tasks if p.search(t))
    if exclude:
        p = re.compile(exclude)
        tasks = (t for t in tasks if not p.search(t))
    tasks = list(tasks)
    to("%s tasks\n\n%s" % (len(tasks), '\n\n'.join(tasks)))


def next_tasks(include=None, exclude=None, to=pager):
    filters = [tp.not_(tp.has('state', 'DONE')),
               tp.has('owner', 'recycler'),
               tp.has_fresh_subtasks(BY_NAME)]

    display_tasks((t for t in repo_tasks() if all(f(t) for f in filters)),
                  include, exclude, to)


def fti(num, to=print):
    to(utils.format_dict(get_task(num, TASKS), indent=True))


def logs(num, idx=-1, to=pager):
    log_file = m_logs.task_event_logs(get_task(num, TASKS))[idx]
    with open(log_file, 'r') as f:
        log = f.read().decode('utf-8', errors='replace')
    to(log_file + ':\n\n' + log)


def stats(names=None, to=dump):
    total = len(names) if names else len(REPOS[CURRENT['new']])
    to(reports.color_totals(BY_COLOR, names, total, summary=True))


def interactive_setup():
    # Bind ‘TAB’ to complete
    readline.parse_and_bind('tab:complete')

    # Set history file – ~\.pythonhistory
    histfile = os.path.join(os.environ['HOME'], '.pythonhistory')

    # Attempt read of histfile
    try:
        readline.read_history_file(histfile)
    except IOError:
        pass

    # Write history file at shell exit
    atexit.register(readline.write_history_file, histfile)

    # Configure logging
    logging.basicConfig(
        format='%(asctime)s %(levelname)-5s %(name)s - %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S',
        stream=sys.stderr, level=logging.INFO)

    config = sys.argv[1]
    LOG.info("Loading configuraition file: %s", config)
    with open(config, 'r') as f:
        global CONFIG
        CONFIG = json.load(f)


if __name__ == '__main__':
    interactive_setup()
    print(__doc__)