import os
import re
import subprocess

from django.conf import settings
from django.db import models

class Project(models.Model):
    title = models.CharField(max_length=50)
    slug = models.SlugField()

    def __unicode__(self):
        return self.title


class Platform(models.Model):
    project = models.ForeignKey('Project')
    title = models.CharField(max_length=50)
    slug = models.SlugField()
    order = models.PositiveIntegerField()

    class Meta:
        ordering = ['order']

    def __unicode__(self):
        return '%s / %s' % (self.project.title, self.title)


class Service(models.Model):
    project = models.ForeignKey('Project')
    title = models.CharField(max_length=50)
    slug = models.SlugField()

    def __unicode__(self):
        return '%s / %s' % (self.project.title, self.title)

    def get_modules(self, platforms=None):
        modules = {}
        if platforms is None:
            platforms = self.project.platform_set.all()
        for platform in platforms:
            try:
                installed_service = InstalledService.objects.get(service=self,
                        platform=platform)
            except InstalledService.DoesNotExist:
                continue
            seen_modules = []
            uninstalled_modules = []
            for installed_version in InstalledVersion.objects.filter(
                    service=installed_service).order_by('-timestamp'):
                if installed_version.version.module in seen_modules:
                    continue
                seen_modules.append(installed_version.version.module)
                if not installed_version.version.version:
                    uninstalled_modules.append(installed_version.version.module)
                    continue
                modules[installed_version.version.module.name] = installed_version.version.module
        return sorted(modules.values(), key=lambda x: x.name)

    def get_installed_service(self, platform):
        try:
            installed_service = InstalledService.objects.get(service=self,
                    platform=platform)
        except InstalledService.DoesNotExist:
            return None
        return installed_service


class InstalledService(models.Model):
    platform = models.ForeignKey('Platform')
    service = models.ForeignKey('Service')
    url = models.URLField()

    def __unicode__(self):
        return '%s / %s / %s (@ %s)' % (self.platform.project.title,
                self.platform.title, self.service.title,
                self.url)


class Module(models.Model):
    name = models.CharField(max_length=50)
    repository_url = models.URLField()

    def __unicode__(self):
        return self.name

    def get_installed_version(self, platform, service):
        try:
            installed_service = InstalledService.objects.get(
                    platform=platform, service=service)
        except InstalledService.DoesNotExist:
            return None
        try:
            v = InstalledVersion.objects.filter(
                    service=installed_service, version__module=self).order_by('-timestamp')[0]
        except IndexError:
            return None
        return v

    def get_git_log(self):
        kws = {}
        kws['stdout'] = subprocess.PIPE
        kws['stderr'] = subprocess.STDOUT
        kws['cwd'] = os.path.join(settings.MEDIA_ROOT, 'src', self.name)
        cmd = ['git', 'log', '--cherry-pick', '--format=oneline']
        p = subprocess.Popen(cmd, **kws)
        stdout = p.communicate()[0]
        p.wait()
        return [x.split(' ', 1) for x in stdout.splitlines()]

    def get_version_hash(self, version_number):
        if re.findall(r'\.g([0-9a-f]{7})', version_number):
            return re.findall(r'\.g([0-9a-f]{7})', version_number)[0]
        if re.findall(r'\+g([0-9a-f]{7})', version_number):
            return re.findall(r'\+g([0-9a-f]{7})', version_number)[0]
        tagname = 'v' + version_number
        kws = {}
        kws['stdout'] = subprocess.PIPE
        kws['stderr'] = subprocess.STDOUT
        kws['cwd'] = os.path.join(settings.MEDIA_ROOT, 'src', self.name)
        cmd = ['git', 'rev-list', '-1', tagname]
        p = subprocess.Popen(cmd, **kws)
        stdout = p.communicate()[0]
        p.wait()
        return stdout[:7]

    def get_diff_log(self, v1, v2, format='oneline', grep=None):
        kws = {}
        kws['stdout'] = subprocess.PIPE
        kws['stderr'] = subprocess.STDOUT
        kws['cwd'] = os.path.join(settings.MEDIA_ROOT, 'src', self.name)
        cmd = ['git', 'log', '--left-right', '--cherry-pick', '--format=%s' % format]
        if grep:
            cmd.append('--grep')
            cmd.append(grep)
        def get_ref(v):
            if re.findall(r'\.g([0-9a-f]{7})', v):
                return re.findall(r'\.g([0-9a-f]{7})', v)[0]
            if re.findall(r'\+g([0-9a-f]{7})', v):
                return re.findall(r'\+g([0-9a-f]{7})', v)[0]
            return 'v' + v
        cmd.append('%s...%s' % (get_ref(v1), get_ref(v2)))

        p = subprocess.Popen(cmd, **kws)
        stdout = p.communicate()[0]
        p.wait()
        return stdout.decode('utf-8')

    def get_all_installed_versions(self):
        versions = set()
        for service in InstalledService.objects.all():
            version = self.get_installed_version(service.platform, service.service)
            if version and version.version.version:
                versions.add(version.version.version)
        return versions

class Version(models.Model):
    module = models.ForeignKey('Module')
    version = models.CharField(max_length=100, blank=True)

    def __unicode__(self):
        return '%s %s' % (self.module.name, self.version)


class InstalledVersion(models.Model):
    service = models.ForeignKey('InstalledService')
    version = models.ForeignKey('Version')
    timestamp = models.DateTimeField()

    def get_previous_version(self):
        try:
            return InstalledVersion.objects.filter(service=self.service,
                    version__module=self.version.module,
                    timestamp__lt=self.timestamp
                    ).order_by('-timestamp')[0]
        except IndexError:
            return None