// subscriptions 演示订阅管理和幂等回执；事件消费及Inbox完整示例随后独立提供。
package main

import (
	"context"
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"os"
	"time"

	orbit "git.yuntuo.hk/k2safe/orbit/sdk/go"
)

func main() {
	if err := run(); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}
func run() error {
	token, queue := os.Getenv("ORBIT_TOKEN"), os.Getenv("ORBIT_QUEUE_ID")
	if path := os.Getenv("ORBIT_CREDENTIALS_FILE"); path != "" {
		raw, err := os.ReadFile(path)
		if err != nil {
			return err
		}
		var credential struct {
			Token   string `json:"token"`
			QueueID string `json:"queue_id"`
		}
		if err = json.Unmarshal(raw, &credential); err != nil {
			return err
		}
		if token == "" {
			token = credential.Token
		}
		if queue == "" {
			queue = credential.QueueID
		}
	}
	if token == "" || queue == "" {
		return errors.New("provide an event-enabled credential and queue via ORBIT_CREDENTIALS_FILE or environment")
	}
	client, err := orbit.NewClient(os.Getenv("ORBIT_URL"), orbit.Options{Token: token})
	if err != nil {
		return err
	}
	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()
	var random [16]byte
	if _, err = rand.Read(random[:]); err != nil {
		return err
	}
	operation := hex.EncodeToString(random[:])
	input := orbit.CreateSubscriptionRequest{Name: "results-" + operation, QueueID: queue, Types: []string{"task.succeeded", "task.failed", "task.cancelled", "task.needs_review"}, MaxPending: 100, MaxAttempts: 20}
	created, err := client.CreateSubscription(ctx, "create-"+operation, input)
	if err != nil {
		return err
	}
	duplicate, err := client.CreateSubscription(ctx, "create-"+operation, input)
	if err != nil {
		return err
	}
	if !duplicate.Deduplicated || duplicate.Subscription.ID != created.Subscription.ID {
		return errors.New("subscription identity was not preserved")
	}
	sub := created.Subscription
	configure := func(enabled bool, key string) error {
		out, err := client.ConfigureSubscription(ctx, sub.ID, key, orbit.ConfigureSubscriptionRequest{ExpectedRevision: sub.Revision, Enabled: enabled, Reason: "subscription management example"})
		if err == nil {
			sub = out.Subscription
		}
		return err
	}
	if err = configure(false, "pause-"+operation); err != nil {
		return err
	}
	if err = configure(true, "resume-"+operation); err != nil {
		return err
	}
	current, err := client.GetSubscription(ctx, sub.ID)
	if err != nil {
		return err
	}
	if !current.Enabled || current.Revision != 3 {
		return errors.New("subscription control state mismatch")
	}
	page, err := client.ListSubscriptions(ctx, queue, orbit.SubscriptionPageRequest{Limit: 100})
	if err != nil {
		return err
	}
	found := false
	for _, item := range page.Items {
		found = found || item.ID == sub.ID
	}
	if !found {
		return errors.New("subscription absent from scoped listing")
	}
	// 示例不启动消费者。结束时暂停本次订阅，保留配置和审计以便核查。
	if err = configure(false, "finish-"+operation); err != nil {
		return err
	}
	fmt.Printf("subscription=%s duplicate=true resumed_revision=3\n", sub.ID)
	fmt.Printf("final_enabled=%t revision=%d pending=%d\n", sub.Enabled, sub.Revision, sub.PendingCount)
	return nil
}