import csv
import json

from pygments import highlight
from pygments.lexers.data import JsonLexer
from pygments.formatters.html import HtmlFormatter

from ajax_select import make_ajax_form
from django.contrib import admin
from django.http import HttpResponse
from django.utils.translation import ugettext_lazy as _
from django.utils.safestring import mark_safe

from commonnet.admin_site import admin_site
from commcrawler import models


def export_as_csv_action(field_names,
                         description=_("Export selected as CSV file"),
                         header=True):
    def export_as_csv(modeladmin, request, queryset):
        """
        Generic csv export admin action.
        based on http://djangosnippets.org/snippets/1697/
        """
        opts = modeladmin.model._meta

        response = HttpResponse(content_type='text/csv')
        response['Content-Disposition'] = 'attachment; filename=%s.csv' % \
            str(opts).replace('.', '_')

        writer = csv.writer(response)
        if header:
            writer.writerow(list(field_names))
        for obj in queryset.values(*field_names).order_by('pk'):
            row = []
            for field in field_names:
                value = obj[field]
                if value is None:
                    value = ""
                else:
                    value = str(value)
                row.append(value)

            writer.writerow(row)
        return response
    export_as_csv.short_description = description
    return export_as_csv




class CrawlAdmin(admin.ModelAdmin):
    model = models.Crawl
    list_display = ("name", "status", "target_nb", "created", "started",
                    "pre_crawl_ended", "crawl_ended", "ended", "progress")
    list_filter = ("status",)
    exclude = ("progression", "created", "started", "pre_crawl_ended",
               "crawl_ended", "ended")
    readonly_fields = ()
    form = make_ajax_form(model, {'targets': 'target'})


admin_site.register(models.Crawl, CrawlAdmin)


class CrawlResultAdmin(admin.ModelAdmin):
    model = models.CrawlResult
    list_display = (
        "short_name", "open_link", "crawl", "started", "duration", "status",
        "is_online", "bad_ssl", "nb_external_link", "nb_internal_link",
        "nb_images", "nb_facebook", "nb_twitter", "nb_instagram", "nb_youtube",
        "nb_dailymotion", "nb_vimeo", "nb_video", "nb_audio", "nb_internal_pdf",
        "nb_external_pdf", "nb_internal_office", "nb_external_office"
    )
    list_filter = ("status", "crawl", "is_online", "bad_ssl")
    search_fields = ("target__name",)

    readonly_fields = (
        "started", "duration", "status", "nb_external_link", "nb_internal_link",
        "nb_images", "nb_facebook", "nb_twitter", "nb_instagram", "nb_youtube",
        "nb_dailymotion", "nb_vimeo", "nb_video", "nb_audio", "nb_internal_pdf",
        "nb_external_pdf", "nb_internal_office", "nb_external_office",
        "is_online", "redirection", "crawl_result_prettified"
    )
    exclude = ("crawl_result",)
    form = make_ajax_form(model, {'target': 'target'})
    actions = [
        export_as_csv_action(
            ("target_id", "target__name", "target__url", "nb_external_link",
             "nb_internal_link", "nb_images", "nb_facebook", "nb_twitter",
             "nb_instagram", "nb_youtube", "nb_dailymotion", "nb_vimeo",
             "nb_video", "nb_audio", "nb_internal_pdf", "nb_external_pdf",
             "nb_internal_office", "nb_external_office", "is_online",
             "redirection")
        )
    ]

    def open_link(self, obj):
        url = obj.url()
        if not url:
            return "-"
        return mark_safe("<a href='{}' target='blank_'>{}</a>".format(url, url))

    def crawl_result_prettified(self, instance):
        response = json.dumps(instance.crawl_result, sort_keys=True, indent=2)
        formatter = HtmlFormatter(style='colorful')
        response = highlight(response, JsonLexer(), formatter)
        style = "<style>" + formatter.get_style_defs() + "</style><br>"
        return mark_safe(style + response)

    crawl_result_prettified.short_description = _("Crawl result")


admin_site.register(models.CrawlResult, CrawlResultAdmin)


class CrawlRelationAdmin(admin.ModelAdmin):
    model = models.CrawlRelation
    list_display = ("crawl", "source", "destination", "number")
    list_filter = ("crawl",)
    search_fields = ["source__name", "destination__name"]
    form = make_ajax_form(model, {'source': 'target', 'destination': 'target'})
    actions = [
        export_as_csv_action(
            ("source_id", "destination_id", "number")
        )
    ]


admin_site.register(models.CrawlRelation, CrawlRelationAdmin)


class ExcludedDomainAdmin(admin.ModelAdmin):
    list_display = ('domain',)
    search_fields = ('domain',)


admin_site.register(models.ExludedDomains, ExcludedDomainAdmin)