#! /usr/bin/env python
#
# RTEMS Tools Project (http://www.rtems.org/)
# Copyright 2022 Chris Johns (chris@contemporary.software)
# All rights reserved.
#
# This file is part of the RTEMS Tools package in 'rtems-tools'.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

import argparse
import sys

import trac
import tickets
import reports


def get_notes(notes_file):
    return [l[:-1] for l in open(notes_file, 'r').readlines()] if notes_file is not None else None


def milestone_to_major_minor(release):
    rtems_major, rtems_minor = release.split('.', 1)
    try:
        major = int(rtems_major)
        rm = ''
        for c in rtems_minor:
            if c.isdigit():
                rm += c
            else:
                break
        try:
            minor = int(rm)
        except:
            raise RuntimeError('invalid release: ' + milestone)
    except:
        raise RuntimeError('invalid release: ' + milestone)
    return major, minor


def milestone_from_major_minor(major, minor):
    return '%d.%d' % (major, minor)


def milestones(release, reverse=False):
    major, minor = milestone_to_major_minor(release)
    ms = [milestone_from_major_minor(major, m) for m in range(1, minor + 1)]
    if reverse:
        ms.reverse()
    return ms


def collect_tickets(release, cache, force):
    '''
    Collect the tickets for the release and all previous release milestones

    A release is major.minor[-.*] from minor back to 1.
    '''
    ticks = {}
    for milestone in milestones(release):
        print(
            f"Fetching and processing tickets for release {release} milestone {milestone}."
        )
        tcache = trac.cache(milestone, cache, force)
        ticks[milestone] = tickets.tickets(release=release, milestone=milestone)
        ticks[milestone].load(cache=tcache)
    return ticks


def generate(ticks, release, notes_file):
    rtems_major, rtems_minor = milestone_to_major_minor(release)
    notes = {}
    for milestone in milestones(release):
        notes[milestone] = get_notes(notes_file % (milestone))
    gen = reports.generator(release)
    gen.generator.gen_heading('Table of Content', reports.heading_base)
    for milestone in milestones(release, reverse=True):
        print(
            f"Formatting tickets for release {release} milestone {milestone}."
        )
        t = ticks[milestone]
        gen.set_milestone(milestone)
        gen.gen_toc(notes[milestone])
    for milestone in milestones(release, reverse=True):
        t = ticks[milestone]
        gen.generator.gen_page_break()
        gen.generator.gen_line_break()
        gen.set_milestone(milestone)
        gen.gen_start(notes[milestone])
        gen.gen_overall_progress(t.tickets['overall_progress'])
        gen.gen_tickets_summary(t.tickets['tickets'])
        gen.gen_tickets_stats_by_category(t.tickets['by_category'])
        gen.gen_individual_tickets_info(t.tickets['tickets'])
    return gen.generator.content


if __name__ == '__main__':

    args = argparse.ArgumentParser()

    args.add_argument('-r',
                      '--release',
                      required=True,
                      dest='release',
                      help='The release to report',
                      type=str,
                      default=None)
    args.add_argument('-f',
                      '--force',
                      dest='force',
                      help='Force downloading of tickets',
                      action='store_true')
    args.add_argument('-c',
                      '--cache',
                      dest='cache',
                      help='Cache file base name of ticket data, one per milestone',
                      type=str,
                      default=None)
    args.add_argument('-o',
                      '--output',
                      required=True,
                      dest='output',
                      help='Output file',
                      type=str,
                      default=None)
    args.add_argument('-N',
                      '--notes',
                      dest='notes',
                      help='Top-level, manually-written release notes',
                      default=None)

    opts = args.parse_args()

    if opts.cache is not None:
        cache = opts.cache
    else:
        cache = '.rng-cache'

    ticks = collect_tickets(release=opts.release, cache=cache, force=opts.force)
    contents = generate(ticks, opts.release, opts.notes)

    print('Writing ' + opts.output)

    with open(opts.output, 'w') as f:
        f.write(contents)