from django.contrib import admin

from .models import CallRecord, ExchangeRate, PointsLedger, PricingRule, RechargeOrder


class ReadOnlyLedgerAdmin(admin.ModelAdmin):
    def get_readonly_fields(self, request, obj=None):
        return tuple(field.name for field in self.model._meta.fields)

    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


@admin.register(PointsLedger)
class PointsLedgerAdmin(ReadOnlyLedgerAdmin):
    list_display = (
        "created_at",
        "user",
        "change_type",
        "points_delta",
        "balance_after",
        "ref_order_id",
        "ref_call",
    )
    list_filter = ("change_type", "created_at")
    search_fields = ("user__username", "user__email", "=ref_order_id", "reason")
    ordering = ("-created_at", "-id")
    date_hierarchy = "created_at"
    list_select_related = ("user", "ref_call")


@admin.register(PricingRule)
class PricingRuleAdmin(admin.ModelAdmin):
    list_display = (
        "operation_type",
        "alias",
        "resolution_display",
        "points_cost",
        "is_active",
        "updated_at",
    )
    list_filter = ("operation_type", "is_active")
    search_fields = ("alias", "resolution")
    ordering = ("operation_type", "alias", "resolution")
    readonly_fields = ("created_at", "updated_at")
    list_editable = ("points_cost", "is_active")

    @admin.display(description="resolution")
    def resolution_display(self, obj):
        return obj.resolution or "*"


@admin.register(ExchangeRate)
class ExchangeRateAdmin(admin.ModelAdmin):
    list_display = (
        "currency",
        "points_per_unit",
        "is_active",
        "effective_from",
        "updated_at",
    )
    list_filter = ("currency", "is_active")
    search_fields = ("currency", "note")
    ordering = ("-effective_from", "-id")
    readonly_fields = ("created_at", "updated_at")
    list_editable = ("is_active",)
    date_hierarchy = "effective_from"


@admin.register(RechargeOrder)
class RechargeOrderAdmin(ReadOnlyLedgerAdmin):
    list_display = (
        "created_at",
        "order_no",
        "user",
        "pay_method",
        "status",
        "amount_money",
        "currency",
        "points_granted",
        "payment_txn_no",
        "paid_at",
    )
    list_filter = ("pay_method", "status", "currency", "created_at")
    search_fields = (
        "order_no",
        "user__username",
        "user__email",
        "payment_txn_no",
    )
    ordering = ("-created_at", "-id")
    date_hierarchy = "created_at"
    list_select_related = ("user",)


@admin.register(CallRecord)
class CallRecordAdmin(ReadOnlyLedgerAdmin):
    list_display = (
        "created_at",
        "user",
        "api_key",
        "operation_type",
        "alias",
        "model_used",
        "points_cost",
        "status",
        "upstream_latency_ms",
    )
    list_filter = ("operation_type", "status", "created_at")
    search_fields = (
        "user__username",
        "user__email",
        "api_key__key_prefix",
        "alias",
        "model_used",
        "prompt",
        "error_message",
        "result_ref",
        "result_summary",
    )
    ordering = ("-created_at", "-id")
    date_hierarchy = "created_at"
    list_select_related = ("user", "api_key")