package cloudflare

import (
	"context"
	"fmt"

	"sync-live/gen"
)

// Provider 暴露 Cloudflare Realtime 后端的能力信息，并持有底层 REST 客户端。
type Provider struct {
	client     *Client
	appID      string
	stun       string
	configured bool
}

func NewProvider(appID, appSecret, baseURL, stun string) *Provider {
	return &Provider{
		client:     NewClient(appID, appSecret, baseURL),
		appID:      appID,
		stun:       stun,
		configured: appID != "" && appSecret != "",
	}
}

func (p *Provider) Name() string      { return "cloudflare" }
func (p *Provider) Primary() bool      { return true }
func (p *Provider) Configured() bool   { return p.configured }

func (p *Provider) Kind() string { return "cf" }

func (p *Provider) Forward(ctx context.Context, room, stream string) (*ForwardResult, error) {
	if !p.configured {
		return nil, fmt.Errorf("cloudflare not configured")
	}
	if room == "" || stream == "" {
		return nil, fmt.Errorf("room and stream required")
	}
	// Stub: actual relay would create a CF session and push stream via WHIP/tracks.
	// Return forwarding status with a placeholder URL that frontend can use to detect readiness.
	return &ForwardResult{Kind: "cf", URL: fmt.Sprintf("/api/cf/forward/%s", stream), Status: "forwarding"}, nil
}

type ForwardResult struct {
	Kind   string
	URL    string
	Status string
}

func (p *Provider) Client() *Client    { return p.client }
func (p *Provider) AppID() string      { return p.appID }

func (p *Provider) Stun() string {
	if p.stun == "" {
		return "stun:stun.cloudflare.com:3478"
	}
	return p.stun
}

func (p *Provider) ApplyConfig(appID, appSecret, baseURL, stun string) {
	p.appID = appID
	// recreate client with new credentials/base
	p.client = NewClient(appID, appSecret, baseURL)
	if stun != "" {
		p.stun = stun
	}
	p.configured = appID != "" && appSecret != ""
}

func (p *Provider) BackendInfo() *gen.BackendInfo {
	return &gen.BackendInfo{
		Kind:       gen.BackendKind_BACKEND_KIND_CLOUDFLARE,
		Name:       "Cloudflare Realtime",
		Configured: p.configured,
		Primary:    true,
	}
}