from django.contrib import admin
from django.shortcuts import redirect
from django.urls import path, reverse
from django.utils import timezone
from django.utils.html import format_html

from .models import Claim, ClaimLog, Project


class ClaimLogInline(admin.TabularInline):
    model = ClaimLog
    extra = 0
    readonly_fields = ("action", "from_status", "to_status", "note", "performed_by", "created_at")
    can_delete = False


@admin.register(Claim)
class ClaimAdmin(admin.ModelAdmin):
    list_display = ("full_name", "amount", "currency", "project", "status", "paid", "created_at", "submitted_by")
    list_filter = ("status", "created_at", "project", "paid_at")
    search_fields = ("full_name", "email", "description")
    base_readonly = ("created_at", "updated_at", "paid_at", "paid_by", "reset_paid_button")
    readonly_fields = base_readonly
    inlines = [ClaimLogInline]
    actions = ("mark_as_paid", "mark_as_unpaid")

    @admin.display(boolean=True, description="Betald")
    def paid(self, obj):
        return obj.is_paid

    @admin.display(description="Återställ betalning")
    def reset_paid_button(self, obj):
        if not obj.is_paid:
            return "Ej betald"
        url = reverse("admin:claims_claim_reset_payment", args=[obj.pk])
        return format_html(
            '<a class="button" href="{}" onclick="return confirm(\'Ta bort betalningsmarkeringen?\');">Resetta</a>',
            url,
        )

    @admin.action(description="Markera valda som betalda")
    def mark_as_paid(self, request, queryset):
        count = 0
        for claim in queryset.filter(status=Claim.Status.APPROVED, paid_at__isnull=True):
            claim.paid_at = timezone.now()
            claim.paid_by = request.user
            claim.save(update_fields=["paid_at", "paid_by"])
            claim.add_log(
                action=ClaimLog.Action.MARKED_PAID,
                performed_by=request.user,
                note="Markerad som betald via Django admin.",
            )
            count += 1
        if count:
            self.message_user(request, f"{count} utlägg markerades som betalda.")
        else:
            self.message_user(request, "Inga utlägg markerades – kontrollera status/betalning.", level="warning")

    @admin.action(description="Återställ betalningsstatus (markera som obetalda)")
    def mark_as_unpaid(self, request, queryset):
        count = 0
        for claim in queryset.filter(paid_at__isnull=False):
            claim.paid_at = None
            claim.paid_by = None
            claim.save(update_fields=["paid_at", "paid_by"])
            claim.add_log(
                action=ClaimLog.Action.MARKED_PAID,
                performed_by=request.user,
                note="Betalningsstatus återställd via Django admin.",
            )
            count += 1
        if count:
            self.message_user(request, f"{count} utlägg markerades som obetalda.")
        else:
            self.message_user(request, "Inga utlägg behövde återställas.", level="warning")

    def save_model(self, request, obj, form, change):
        super().save_model(request, obj, form, change)

    def get_urls(self):
        urls = super().get_urls()
        custom_urls = [
            path(
                "<int:claim_id>/reset-payment/",
                self.admin_site.admin_view(self.reset_payment_view),
                name="claims_claim_reset_payment",
            ),
        ]
        return custom_urls + urls

    def reset_payment_view(self, request, claim_id):
        claim = Claim.objects.filter(pk=claim_id).first()
        if not claim:
            self.message_user(request, "Utlägget hittades inte.", level="error")
            return redirect("admin:claims_claim_changelist")
        claim.paid_at = None
        claim.paid_by = None
        claim.save(update_fields=["paid_at", "paid_by"])
        claim.add_log(
            action=ClaimLog.Action.MARKED_PAID,
            performed_by=request.user,
            note="Betalningsstatus återställd via reset-knapp i admin.",
        )
        self.message_user(request, f"{claim} markerades som obetald.")
        return redirect("admin:claims_claim_change", claim_id)

    def get_readonly_fields(self, request, obj=None):
        if obj and obj.is_paid:
            return self.base_readonly + ("status", "decision_note")
        return self.base_readonly


@admin.register(ClaimLog)
class ClaimLogAdmin(admin.ModelAdmin):
    list_display = ("claim", "action", "from_status", "to_status", "performed_by", "created_at")
    list_filter = ("action", "to_status", "created_at")


@admin.register(Project)
class ProjectAdmin(admin.ModelAdmin):
    list_display = ("name", "code", "is_active", "updated_at")
    list_filter = ("is_active",)
    search_fields = ("name", "code")