from django.contrib import admin
from django.core.urlresolvers import reverse
from django.utils.html import escape
from django.utils.translation import ugettext_lazy as _

from orchestra.admin.html import monospace_format
from orchestra.admin.utils import link

from .models import Server, Route, BackendLog, BackendOperation


STATE_COLORS = {
    BackendLog.RECEIVED: 'darkorange',
    BackendLog.TIMEOUT: 'red',
    BackendLog.STARTED: 'blue',
    BackendLog.SUCCESS: 'green',
    BackendLog.FAILURE: 'red',
    BackendLog.ERROR: 'red',
    BackendLog.REVOKED: 'magenta',
}


class RouteAdmin(admin.ModelAdmin):
    list_display = [
        'id', 'backend', 'host', 'match', 'display_model', 'is_active'
    ]
    list_editable = ['backend', 'host', 'match', 'is_active']
    list_filter = ['backend', 'host', 'is_active']
    
    def display_model(self, route):
        try:
            return route.get_backend().model
        except KeyError:
            return "<span style='color: red;'>NOT AVAILABLE</span>"
    display_model.short_description = _("model")
    display_model.allow_tags = True


class BackendOperationInline(admin.TabularInline):
    model = BackendOperation
    fields = ('action', 'instance_link')
    readonly_fields = ('action', 'instance_link')
    extra = 0
    can_delete = False
    
    class Media:
        css = {
            'all': ('orchestra/css/hide-inline-id.css',)
        }
    
    def instance_link(self, operation):
        try:
            return link('instance')(self, operation)
        except:
            return _("deleted %s %s") % (operation.content_type, operation.object_id)
    instance_link.allow_tags = True
    instance_link.short_description = _("Instance")
    
    def has_add_permission(self, *args, **kwargs):
        return False


class BackendLogAdmin(admin.ModelAdmin):
    list_display = (
        'id', 'backend', 'server_link', 'display_state', 'exit_code', 'created',
        'execution_time',
    )
    list_display_links = ('id', 'backend')
    list_filter = ('state', 'backend')
    date_hierarchy = 'last_update'
    inlines = [BackendOperationInline]
    fields = [
        'backend', 'server', 'state', 'mono_script', 'mono_stdout', 'mono_stderr',
        'mono_traceback', 'exit_code', 'task_id', 'created', 'last_update',
        'execution_time'
    ]
    readonly_fields = [
        'backend', 'server', 'state', 'mono_script', 'mono_stdout', 'mono_stderr',
        'mono_traceback', 'exit_code', 'task_id', 'created', 'last_update',
        'execution_time'
    ]
    
    def server_link(self, log):
        url = reverse('admin:orchestration_server_change', args=(log.server.pk,))
        return '<a href="%s">%s</a>' % (url, log.server.name)
    server_link.short_description = _("server")
    server_link.allow_tags = True
    
    def display_state(self, log):
        color = STATE_COLORS.get(log.state, 'grey')
        return '<span style="color: %s;">%s</span>' % (color, log.state)
    display_state.short_description = _("state")
    display_state.allow_tags = True
    display_state.admin_order_field = 'state'
    
    def mono_script(self, log):
        return monospace_format(escape(log.script))
    mono_script.short_description = _("script")
    
    def mono_stdout(self, log):
        return monospace_format(escape(log.stdout))
    mono_stdout.short_description = _("stdout")
    
    def mono_stderr(self, log):
        return monospace_format(escape(log.stderr))
    mono_stderr.short_description = _("stderr")
    
    def mono_traceback(self, log):
        return monospace_format(escape(log.traceback))
    mono_traceback.short_description = _("traceback")
    
    def get_queryset(self, request):
        """ Order by structured name and imporve performance """
        qs = super(BackendLogAdmin, self).get_queryset(request)
        return qs.select_related('server')


class ServerAdmin(admin.ModelAdmin):
    list_display = ('name', 'address', 'os')
    list_filter = ('os',)


admin.site.register(Server, ServerAdmin)
admin.site.register(BackendLog, BackendLogAdmin)
admin.site.register(Route, RouteAdmin)