from django.contrib import admin
from django.utils.translation import ugettext_lazy as _
from django.core.urlresolvers import reverse
from django.db.models import F
from boards.models import Post, Tag, Ban, Thread, Banner, PostImage, KeyPair, GlobalId


@admin.register(Post)
class PostAdmin(admin.ModelAdmin):

    list_display = ('id', 'title', 'text', 'poster_ip', 'linked_images',
            'foreign')
    list_filter = ('pub_time',)
    search_fields = ('id', 'title', 'text', 'poster_ip')
    exclude = ('referenced_posts', 'refmap', 'images', 'global_id')
    readonly_fields = ('poster_ip', 'threads', 'thread', 'linked_images',
            'attachments', 'uid', 'url', 'pub_time', 'opening', 'linked_global_id',
            'version', 'foreign')

    def ban_poster(self, request, queryset):
        bans = 0
        for post in queryset:
            poster_ip = post.poster_ip
            ban, created = Ban.objects.get_or_create(ip=poster_ip)
            if created:
                bans += 1
        self.message_user(request, _('{} posters were banned').format(bans))

    def ban_with_hiding(self, request, queryset):
        bans = 0
        hidden = 0
        for post in queryset:
            poster_ip = post.poster_ip
            ban, created = Ban.objects.get_or_create(ip=poster_ip)
            if created:
                bans += 1
            posts = Post.objects.filter(poster_ip=poster_ip, id__gte=post.id)
            hidden += posts.count()
            posts.update(hidden=True)
        self.message_user(request, _('{} posters were banned, {} messages were hidden').format(bans, hidden))

    def linked_images(self, obj: Post):
        images = obj.images.all()
        image_urls = ['<a href="{}"><img src="{}" /></a>'.format(
            reverse('admin:%s_%s_change' % (image._meta.app_label,
                                            image._meta.model_name),
                    args=[image.id]), image.image.url_200x150) for image in images]
        return ', '.join(image_urls)
    linked_images.allow_tags = True

    def linked_global_id(self, obj: Post):
        global_id = obj.global_id
        if global_id is not None:
            return '<a href="{}">{}</a>'.format(
                reverse('admin:%s_%s_change' % (global_id._meta.app_label,
                                                global_id._meta.model_name),
                        args=[global_id.id]), str(global_id))
    linked_global_id.allow_tags = True

    def save_model(self, request, obj, form, change):
        obj.increment_version()
        obj.save()
        obj.clear_cache()

    def foreign(self, obj: Post):
        return obj is not None and obj.global_id is not None and\
                not obj.global_id.is_local()

    actions = ['ban_poster', 'ban_with_hiding']


@admin.register(Tag)
class TagAdmin(admin.ModelAdmin):

    def thread_count(self, obj: Tag) -> int:
        return obj.get_thread_count()

    def display_children(self, obj: Tag):
        return ', '.join([str(child) for child in obj.get_children().all()])

    def save_model(self, request, obj, form, change):
        super().save_model(request, obj, form, change)
        for thread in obj.get_threads().all():
            thread.refresh_tags()
    list_display = ('name', 'thread_count', 'display_children')
    search_fields = ('name',)


@admin.register(Thread)
class ThreadAdmin(admin.ModelAdmin):

    def title(self, obj: Thread) -> str:
        return obj.get_opening_post().get_title()

    def reply_count(self, obj: Thread) -> int:
        return obj.get_reply_count()

    def ip(self, obj: Thread):
        return obj.get_opening_post().poster_ip

    def display_tags(self, obj: Thread):
        return ', '.join([str(tag) for tag in obj.get_tags().all()])

    def op(self, obj: Thread):
        return obj.get_opening_post_id()

    # Save parent tags when editing tags
    def save_related(self, request, form, formsets, change):
        super().save_related(request, form, formsets, change)
        form.instance.refresh_tags()

    def save_model(self, request, obj, form, change):
        op = obj.get_opening_post()
        op.increment_version()
        op.save(update_fields=['version'])
        obj.save()
        op.clear_cache()

    list_display = ('id', 'op', 'title', 'reply_count', 'status', 'ip',
            'display_tags')
    list_filter = ('bump_time', 'status')
    search_fields = ('id', 'title')
    filter_horizontal = ('tags',)


@admin.register(KeyPair)
class KeyPairAdmin(admin.ModelAdmin):
    list_display = ('public_key', 'primary')
    list_filter = ('primary',)
    search_fields = ('public_key',)


@admin.register(Ban)
class BanAdmin(admin.ModelAdmin):
    list_display = ('ip', 'can_read')
    list_filter = ('can_read',)
    search_fields = ('ip',)


@admin.register(Banner)
class BannerAdmin(admin.ModelAdmin):
    list_display = ('title', 'text')


@admin.register(PostImage)
class PostImageAdmin(admin.ModelAdmin):
    search_fields = ('alias',)


@admin.register(GlobalId)
class GlobalIdAdmin(admin.ModelAdmin):
    def is_linked(self, obj):
        return Post.objects.filter(global_id=obj).exists()

    list_display = ('__str__', 'is_linked',)
    readonly_fields = ('content',)