from django.core import mail
from django.contrib import admin, messages
from django.db.models.functions import Now

from .models import (
    CmsRedRiverVeteransScholarship,
    CertificationDefinition,
    Certification,
    CertificationVersion,
    InstructorOrVendor,
    SpecialProgram,
    Waiver,
)
from .certification_emails import all_certification_emails


class CertificationVersionInline(admin.TabularInline):
    model = CertificationVersion
    extra = 1


@admin.register(CertificationVersion)
class CertificationVersionAdmin(admin.ModelAdmin):
    search_fields = ["definition__certification_name", "version"]
    list_display = ["definition", "version"]
    list_filter = ["definition__department", "definition__certification_name"]


@admin.register(CertificationDefinition)
class CertificationDefinitionAdmin(admin.ModelAdmin):
    search_fields = ["certification_name"]
    list_display = ["certification_name", "department"]
    list_filter = ["department"]
    inlines = [CertificationVersionInline]


@admin.register(Certification)
class CertificationAdmin(admin.ModelAdmin):
    search_fields = [
        "name",
        "certification_version__definition__certification_name",
        "certification_version__definition__department",
    ]
    autocomplete_fields = ["member"]
    exclude = ["shop_lead_notified"]

    @admin.display(
        description="Certification Name",
        ordering="certification_version__definition__certification_name",
    )
    def certification_name(self, obj):
        return obj.certification_version.definition.certification_name

    @admin.display(
        description="Certification Version", ordering="certification_version__version"
    )
    def certification_version_version(self, obj):
        return obj.certification_version.version

    @admin.display(
        description="Department",
        ordering="certification_version__definition__department",
    )
    def certification_department(self, obj):
        return obj.certification_version.definition.department

    list_display = [
        "certification_name",
        "name",
        "certification_version_version",
        "certification_department",
        "date",
        "shop_lead_notified",
        "certified_by",
    ]
    list_display_links = [
        "certification_name",
        "name",
    ]
    list_filter = [
        "certification_version__definition__department",
        ("shop_lead_notified", admin.EmptyFieldListFilter),
    ]

    actions = ["send_notifications"]

    @admin.action(
        description="Notify Shop Leads and Members of selected certifications"
    )
    def send_notifications(self, request, queryset):
        try:
            emails = list(all_certification_emails(queryset))

            with mail.get_connection() as conn:
                conn.send_messages(emails)

            for cert in queryset:
                cert.shop_lead_notified = Now()
                cert.save()

            self.message_user(
                request,
                f"{len(emails)} notifications sent for {len(queryset)} certifications",
                messages.SUCCESS,
            )
        except Exception as e:
            self.message_user(
                request,
                f"Failed to send notifications! {e}",
                messages.ERROR,
            )
            raise


@admin.register(InstructorOrVendor)
class InstructorOrVendorAdmin(admin.ModelAdmin):
    search_fields = ["name"]


@admin.register(SpecialProgram)
class SpecialProgramAdmin(admin.ModelAdmin):
    search_fields = ["program_name"]


@admin.register(Waiver)
class WaiverAdmin(admin.ModelAdmin):
    search_fields = ["name"]


admin.site.register(CmsRedRiverVeteransScholarship)