package payments

import (
	"context"
	"log/slog"
	"strconv"
	"time"

	"github.com/noderunners/nip05api/internal/audit"
	"github.com/noderunners/nip05api/internal/dm"
	"github.com/noderunners/nip05api/internal/invoice"
	"github.com/noderunners/nip05api/internal/nostr"
	"github.com/noderunners/nip05api/internal/user"
	"github.com/noderunners/nip05api/internal/webhook"
)

func (w *Worker) dispatchEvents(ctx context.Context, u *user.User, p *invoice.PendingInvoice, ev dm.EventType) {
	vars := buildVars(u, w.domain, w.frontend)
	if err := w.dms.Send(ctx, ev, u.Pubkey, vars); err != nil {
		slog.Error("dm enqueue", "err", err)
	}
	data := map[string]any{
		"pubkey":            u.Pubkey,
		"npub":              nostr.HexToNpub(u.Pubkey),
		"username":          u.Username,
		"subscription_type": string(u.SubscriptionType),
		"amount_sats":       p.AmountSats,
		"payment_hash":      p.PaymentHash,
		"is_renewal":        p.IsRenewal,
	}
	if u.ExpiresAt != nil {
		data["expires_at"] = u.ExpiresAt.UTC().Format(time.RFC3339)
	}
	if err := w.hooks.Enqueue(ctx, webhook.EventUserPaid, data); err != nil {
		slog.Error("webhook enqueue", "err", err)
	}
	w.audit.Log(ctx, audit.ActionPaymentConfirmed, audit.ActorSystem, u.Pubkey, map[string]any{
		"payment_hash": p.PaymentHash,
		"amount_sats":  p.AmountSats,
		"is_renewal":   p.IsRenewal,
		"event":        string(ev),
	})
	slog.Info("payment confirmed",
		"pubkey", u.Pubkey, "username", u.Username,
		"amount_sats", p.AmountSats, "renewal", p.IsRenewal)
}

func buildVars(u *user.User, domain, frontend string) map[string]string {
	expires := "lifetime"
	days := ""
	if u.ExpiresAt != nil {
		expires = u.ExpiresAt.Format("2006-01-02")
		d := int(time.Until(*u.ExpiresAt).Hours() / 24)
		if d < 0 {
			d = 0
		}
		days = strconv.Itoa(d)
	}
	return map[string]string{
		"username":          u.Username,
		"npub":              nostr.HexToNpub(u.Pubkey),
		"pubkey":            u.Pubkey,
		"domain":            domain,
		"expires_at":        expires,
		"days_remaining":    days,
		"frontend_url":      frontend,
		"subscription_type": string(u.SubscriptionType),
	}
}