from django.contrib import admin
from django.utils.html import format_html

from .models import AuditEvent, BackfillRun


class ActorTypeFilter(admin.SimpleListFilter):
    title = "Actor type"
    parameter_name = "actor_type"

    def lookups(self, request, model_admin):
        return (
            ("named", "Named actor"),
            ("programmatic", "Programmatic"),
        )

    def queryset(self, request, queryset):
        if self.value() == "named":
            return queryset.filter(actor__isnull=False)
        if self.value() == "programmatic":
            return queryset.filter(actor__isnull=True)
        return queryset


@admin.register(AuditEvent)
class AuditEventAdmin(admin.ModelAdmin):
    list_display = (
        "event_time",
        "actor_display",
        "action_detail_display",
        "target_summary",
        "evidence_display",
        "reconstructed_display",
        "message_display",
    )

    list_filter = (
        "action",
        ActorTypeFilter,
        "evidence_category",
        "source",
        "is_reconstructed",
        "actor",
        "event_time",
        "target_type",
    )

    search_fields = (
        'actor__username',
        'actor__email',
        'target_repr',
        'target_id',
        'message',
        "source_id",
    )

    readonly_fields = (
        "id",
        "timestamp",
        "event_time",
        "actor",
        "action",
        "evidence_category",
        "control_family",
        "target_type",
        "target_id",
        "target_repr",
        "old_values_display",
        "new_values_display",
        "old_values",
        "new_values",
        "message",
        "source",
        "source_id",
        "is_reconstructed",
        "request_path",
        "ip_address",
    )

    date_hierarchy = "event_time"

    def message_display(self, obj):
        return obj.message or ""

    message_display.short_description = "Message"

    def actor_display(self, obj):
        return obj.actor_display

    actor_display.short_description = "Actor"
    actor_display.admin_order_field = "actor"

    def action_display(self, obj):
        return obj.action_display

    action_display.short_description = "Action"
    action_display.admin_order_field = "action"

    def action_detail_display(self, obj):
        return obj.action_detail_display

    action_detail_display.short_description = "Action"
    action_detail_display.admin_order_field = "action"

    def transition_display(self, obj):
        return obj.transition_display

    transition_display.short_description = "Transition"

    def target_summary(self, obj):
        return obj.target_summary

    target_summary.short_description = "Target"
    target_summary.admin_order_field = "target_repr"

    def evidence_summary(self, obj):
        return obj.evidence_summary

    evidence_summary.short_description = "Evidence"
    evidence_summary.admin_order_field = "evidence_category"

    def evidence_display(self, obj):
        return format_html("{}<br><span>{}</span>", obj.evidence_area_display, f"Source: {obj.source_display}")

    evidence_display.short_description = "Evidence"
    evidence_display.admin_order_field = "evidence_category"

    def reconstructed_display(self, obj):
        return obj.reconstructed_display

    reconstructed_display.short_description = "Reconstructed"
    reconstructed_display.admin_order_field = "is_reconstructed"

    def old_values_display(self, obj):
        return obj.old_values_display

    old_values_display.short_description = "Old values (resolved)"

    def new_values_display(self, obj):
        return obj.new_values_display

    new_values_display.short_description = "New values (resolved)"

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return False

    def has_delete_permission(self, request, obj=None):
        return False

    def log_addition(self, request, obj, message):
        return None

    def log_change(self, request, obj, message):
        return None

    def log_deletion(self, request, obj, object_repr):
        return None

    def log_deletions(self, request, queryset):
        return []


@admin.register(BackfillRun)
class BackfillRunAdmin(admin.ModelAdmin):
    list_display = ("name", "started", "completed", "created_events", "dry_run")
    readonly_fields = ("name", "started", "completed", "created_events", "dry_run", "notes")
    search_fields = ("name", "notes")
    list_filter = ("dry_run", "started", "completed")

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return False

    def has_delete_permission(self, request, obj=None):
        return False