package server

import (
	"encoding/csv"
	"fmt"
	"strconv"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

// consoleRefund refunds a paid order in full at the operator's request. The operator performs the
// actual money refund on the rail (Robokassa cabinet / VK support / Telegram refundStarPayment);
// this records it — a refund ledger row and a floor-0 chip revoke (never negative, D27). Idempotent.
func (s *Server) consoleRefund(c *gin.Context) {
	id, ok := s.consoleUUID(c, "/_gm/users")
	if !ok {
		return
	}
	back := "/_gm/users/" + id.String()
	if s.payments == nil {
		s.renderConsoleMessage(c, "Unavailable", "payments are not enabled", back)
		return
	}
	orderID, err := uuid.Parse(strings.TrimSpace(c.PostForm("order_id")))
	if err != nil {
		s.renderConsoleMessage(c, "Refund failed", "no order to refund", back)
		return
	}
	out, err := s.payments.RefundOrderFull(c.Request.Context(), orderID)
	if err != nil {
		s.renderConsoleMessage(c, "Refund failed", err.Error(), back)
		return
	}
	if out.AlreadyRefunded {
		s.renderConsoleMessage(c, "Already refunded", "this order was already refunded", back)
		return
	}
	s.publishBannerChange(id)
	msg := fmt.Sprintf("revoked %d chips", out.Revoked)
	if out.Loss > 0 {
		msg += fmt.Sprintf("; %d chips were already spent (recorded as a loss + abuse flag)", out.Loss)
	}
	s.renderConsoleMessage(c, "Refunded", msg, back)
}

// consoleLedgerExport streams the entire append-only ledger as a CSV attachment for tax reporting
// and rail reconciliation. The snapshot column carries the raw purchase/refund JSON.
func (s *Server) consoleLedgerExport(c *gin.Context) {
	rows, err := s.payments.LedgerExport(c.Request.Context())
	if err != nil {
		s.consoleError(c, err)
		return
	}
	c.Header("Content-Type", "text/csv; charset=utf-8")
	c.Header("Content-Disposition", `attachment; filename="ledger.csv"`)
	w := csv.NewWriter(c.Writer)
	_ = w.Write([]string{
		"created_at", "account_id", "kind", "source", "origin", "chips_delta",
		"product_id", "order_id", "provider", "provider_payment_id", "snapshot",
	})
	for _, r := range rows {
		_ = w.Write([]string{
			r.CreatedAt.UTC().Format(time.RFC3339), r.AccountID, r.Kind, r.Source, r.Origin,
			strconv.Itoa(r.ChipsDelta), r.ProductID, r.OrderID, r.Provider, r.ProviderPaymentID, r.Snapshot,
		})
	}
	w.Flush()
}
