#!/usr/bin/env python

import json
import morphlib
import os
import subprocess
import sys
import urllib
import urllib2
import urlparse
import yaml
import re

# NOTE: The following reimplements part of morphlib's remote repo cache stuff
def parse_repo_alias(repo):
    domain, path = repo.split(':')
    if domain == 'baserock':
        repo = 'ssh://git@git.baserock.org/baserock/%s' % path
    elif domain == 'upstream':
        repo = 'ssh://git@git.baserock.org/delta/%s' % path
    else:
        raise Exception("I don't know how to parse the repo-alias \"%s\"" % repo)
    return repo

def make_request(path):
    server_url = 'http://git.baserock.org:8080/'
    url = urlparse.urljoin(server_url, '/1.0/%s' % path)
    handle = urllib2.urlopen(url)
    return handle.read()

def quote(*args):
    return tuple(urllib.quote(string) for string in args)

def cat_file(repo, ref, filename):
    return make_request('files?repo=%s&ref=%s&filename=%s' %
                         quote(repo, ref, filename))

# NOTE: This function reimplement part of morphlib's loader
def sanitise_morphology_path(morph_field, morph_kind, belongs_to='None'):
    '''This function receives the name or the morph field of one morphology
    and returns the path of the morphology depending on the name, kind and
    if it belongs to other morphologies.
    '''
    # Dictionary which match morphology's kind and morphology's
    # directory in definitions.git
    morph_dir = { 'chunk': 'chunks', 'stratum': 'strata',
                  'system':'systems', 'cluster': 'clusters'}
    # For chunks morphologies we need to know to which stratums
    # belongs this chunk.
    if morph_kind == 'chunk':
        if belongs_to == 'None':
            raise morphlib.Error('Chunk morphologies need the stratum name'
                                 'to create the path. Please add the stratum'
                                 'which belongs this morphology')
        # Get the name of the chunk which we assume is at the end
        # of the morph file
        if '/' in morph_field:
            morph_field = morph_field.split('/')[-1]

        # Add the stratum name to the chunk name
        morph_field = belongs_to + '/' + morph_field

        # Reset the kind to stratum because chunk contains stratum
        # name in its path.
        morph_kind = 'stratum'

    # Add the morphology path to the morph field.
    if morph_dir[morph_kind] not in morph_field:
        morph_field = morph_dir[morph_kind] + '/' + morph_field

    # Add the morphology suffix if the morphology.
    if not morph_field.endswith('.morph'):
        morph_field = morph_field + '.morph'

    return morph_field

def create_directory(name, path):
    directory = os.path.join(path, name)
    subprocess.call(['mkdir','-p', directory])
    return directory

def move_file(morph, directory, path):
    if not morph.filename.startswith(directory):
        filename = morph.filename.split('/')[-1]
        new_location = os.path.join(path, filename)
        print 'Moving %s into %s' % (filename, new_location)
        subprocess.call(['git', 'mv', morph.filename, new_location])
        morph.filename = new_location
        loader.save_to_file(morph.filename, morph)

def move_morphologies(morphs, kind, directory, path):
    # Dictionary which match morphology's kind and morphology's
    # directory in definitions.git
    morph_dir = { 'chunk': 'chunks', 'stratum': 'strata',
                  'system':'systems', 'cluster': 'clusters'}
    # Create the morphology's directory and move the morphologies to it
    full_path = create_directory(directory, path)
    for morph in morphs:
        # Add the correct path to the morph fields in the morphology.
        for submorph in morph[morph_dir[kind]]:
            submorph['morph'] = sanitise_morphology_path(submorph['morph'], kind)
        move_file(morph, directory, full_path)

def move_clusters(morphs):
    kind = 'system'
    directory = 'clusters'
    path = definitions_repo
    # Move cluster morphologies to clusters folder fixing their dependent
    # morphologies which are systems.
    move_morphologies(morphs, kind, directory, path)

def move_systems(morphs):
    kind = 'stratum'
    directory = 'systems'
    path = definitions_repo
    # Move system morphologies to systems folder fixing their dependent
    # morphologies which are strata.
    move_morphologies(morphs, kind, directory, path)

def move_chunks(morphs):
    # There are not spec for this yet
    print "No spec defined"

def download_chunks(morph):
    # Download chunks morphologies defined on the stratum and
    # add them to the directory tree.
    for chunk in morph['chunks']:
        name = chunk['name'] + '.morph'
        chunk['morph'] = sanitise_morphology_path(chunk['morph'], 'chunk', morph['name'])
        ref = chunk['ref']
        repo = parse_repo_alias(chunk['repo'])
        try:
            chunk_morph = cat_file(repo, ref, name)
            new_chunk = loader.load_from_string(chunk_morph)
            loader.save_to_file(chunk['morph'], new_chunk)
            print "Downloading %s from %s into %s" %(name, repo, chunk['morph'])
        except urllib2.HTTPError as err:
            # If there is no morphology in the repository we assume that the morphology
            # system will be autodetected, so we don't have to create a new one
            # unless we shut down the autodetecting system (fallback system).
            if err.code == 404:
                print "%s not found in %s" %(name, repo)
        except morphlib.morphloader.InvalidFieldError as err:
            print "ERROR: %s in chunk \n%s" % (err, chunk_morph)
            if "comments" in str(err):
                # This error is caused because there are old morphologies which
                # contain the field "comments" instead of "description".
                # Replacing "comments" field by "description" will allow the morphology
                # to pass parse_morphology_text check and ready to be written to a file.
                fixed_chunk = loader.parse_morphology_text(chunk_morph, name)
                fixed_chunk['description'] = fixed_chunk.pop('comments')
                loader.save_to_file(chunk['morph'], fixed_chunk)
                print "Downloading %s from %s into %s" %(name, repo, chunk['morph'])
            if "buildsystem" in str(err):
                # This error is caused because a typo in a morphology which
                # has a field "buildsystem" instead of "build-system".
                fixed_chunk = loader.parse_morphology_text(chunk_morph, name)
                fixed_chunk['build-system'] = fixed_chunk.pop('buildsystem')
                loader.save_to_file(chunk['morph'], fixed_chunk)
                print "Downloading %s from %s into %s" %(name, repo, chunk['morph'])
        except morphlib.morphloader.MorphologyNotYamlError as err:
            print "ERROR: %s in chunk \n%s" % (err, chunk_morph)
            # This error is caused because there are old morphologies written
            # in JSON which contain '\t' characters. When try to load this
            # kind of morphologies load_from_string fails when parse_morphology_text.
            # Removing this characters will make load_from_string to load the morphology
            # and translate it into a correct yaml format.
            fix_chunk = chunk_morph.replace('\t','')
            new_chunk = loader.load_from_string(fix_chunk)
            loader.save_to_file(chunk['morph'], new_chunk)
            print "Downloading %s from %s into %s" %(name, repo, chunk['morph'])

def move_strata(morphs):
    # Create strata directory
    strata_dir = 'strata/'
    strata_path = create_directory(strata_dir, definitions_repo)
    for morph in morphs:
        # Create stratum directory where downloading its chunks.
        stratum_path = strata_path + morph['name']
        stratum_dir = create_directory(stratum_path, definitions_repo)

        # Download chunks which belongs to the stratum
        download_chunks(morph)

        # Add to build-depends the correct path to the dependent stratum morphologies.
        for build_depends in morph['build-depends']:
            build_depends['morph'] = sanitise_morphology_path(build_depends['morph'], 'stratum')
        # Move stratum morphologies to strata
        move_file(morph, strata_dir, strata_path)

# Load all morphologies in the definitions repo
sb = morphlib.sysbranchdir.open_from_within('.')
loader = morphlib.morphloader.MorphologyLoader()
morphs = [m for m in sb.load_all_morphologies(loader)]


# Clasify the morphologies regarding of their kind field
morphologies = { 'chunk': '', 'stratum': '', 'system' : '', 'cluster': '' }

for key in morphologies.iterkeys():
    morphologies[key] = [m for m in morphs if m['kind'] == key]
    print 'There are: %d %s' %(len(morphologies[key]), key)

# Get the path from definitions repo
definitions_repo = sb.get_git_directory_name(sb.root_repository_url)

# Move the morphologies to its directories
for key in morphologies.iterkeys():
    print "Moving %s....\n" %key
    if key == 'cluster': move_clusters(morphologies[key])
    elif key == 'system': move_systems(morphologies[key])
    elif key == 'stratum': move_strata(morphologies[key])
    elif key == 'chunk': move_chunks(morphologies[key])
    else: print 'ERROR: Morphology not know %' % key