package console

import (
	"context"
	"fmt"
	"log"
	"net/url"
	"strings"
	"time"

	"github.com/carlosframework/platform/internal/objstore"
)

// notifyStoreEntitlement sends the best-effort nudge attached to a durable
// entitlement write. Callers launch it after PutEntitlement succeeds, off the
// request goroutine. A notification failure never changes the stored result.
func (s *Server) notifyStoreEntitlement(account string, e *objstore.Entitlement) {
	if s.sendApp == nil || e == nil || e.Applied == nil {
		return
	}
	if e.Decision == nil {
		s.notifyStoreApplied(account)
		return
	}
	s.notifyStoreDecided(account, e)
}

func (s *Server) notifyStoreApplied(account string) {
	run, err := s.storeNotificationRecipients()
	if err != nil {
		log.Printf("console: store application %s: recipients: %v", account, err)
		return
	}
	if len(run.missing) != 0 {
		log.Printf("console: store application %s: no keymail grant for %s — not notified (they must sign in to the console once)",
			account, strings.Join(run.missing, ", "))
	}
	subject := fmt.Sprintf("[carlos] Object storage application for %s", account)
	body := fmt.Sprintf("Account %s applied for object storage.\n\nReview storage applications:\n%s/fleet/store\n", account, s.cfg.Origin)
	for _, op := range run.to {
		s.sendStoreNotification(op, subject, body, "application "+account)
	}
}

// storeNotificationRecipients is the intersection of the configured storage
// operators and the fleet-operator role. The configured list narrows the role;
// it never grants authority by itself.
func (s *Server) storeNotificationRecipients() (*alertRun, error) {
	operators, err := s.store.Operators()
	if err != nil {
		return nil, fmt.Errorf("operators: %w", err)
	}
	fleet := make(map[string]bool, len(operators))
	for _, address := range operators {
		fleet[strings.ToLower(strings.TrimSpace(address))] = true
	}
	configured := make([]string, 0, len(s.cfg.StoreOperators))
	for _, address := range s.cfg.StoreOperators {
		address = strings.ToLower(strings.TrimSpace(address))
		if fleet[address] {
			configured = append(configured, address)
		}
	}
	return s.grantRecipients(configured)
}

func (s *Server) notifyStoreDecided(account string, e *objstore.Entitlement) {
	address := strings.ToLower(strings.TrimSpace(e.Applied.By))
	run, err := s.grantRecipients([]string{address})
	if err != nil {
		log.Printf("console: store decision %s: recipient: %v", account, err)
		return
	}
	state := "declined"
	if e.Decision.Approved {
		state = "approved"
	}
	subject := fmt.Sprintf("[carlos] Object storage application %s", state)
	body := fmt.Sprintf("Object storage for account %s was %s.\n\nAccount settings:\n%s/a/%s/settings\n",
		account, state, s.cfg.Origin, url.PathEscape(account))
	for _, recipient := range run.to {
		s.sendStoreNotification(recipient, subject, body, "decision "+account)
	}
	// Someone who signed in by email has no grant: the notice goes by
	// Keymail federation or the console's own email instead.
	for _, missing := range run.missing {
		ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
		if _, err := s.deliver(ctx, missing, subject, body, 12*time.Second); err != nil {
			log.Printf("console: store decision %s: delivery to %s: %v", account, missing, err)
		}
		cancel()
	}
}

func (s *Server) sendStoreNotification(recipient operatorGrant, subject, body, event string) {
	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()
	if _, err := s.sendApp(ctx, recipient.token, recipient.address, subject, body); err != nil {
		log.Printf("console: store %s: keymail to %s: %v", event, recipient.address, err)
	}
}