// Package peer sends clipboard content to remote clip-sync peers via HTTP POST.
package peer

import (
	"bytes"
	"encoding/json"
	"fmt"
	"log"
	"net"
	"net/http"
	"time"

	"git.dracodev.net/Projets/clip-sync/internal/config"
	"git.dracodev.net/Projets/clip-sync/internal/dedup"
)

const clipPath = "/clip"

// Broadcaster sends clip payloads to all configured peers concurrently.
type Broadcaster struct {
	peers  []config.PeerConfig
	origin string
	client *http.Client
}

// NewBroadcaster creates a Broadcaster for the configured peer list.
func NewBroadcaster(peers []config.PeerConfig, origin string) *Broadcaster {
	return &Broadcaster{
		peers:  peers,
		origin: origin,
		client: &http.Client{
			Timeout: 5 * time.Second,
			Transport: &http.Transport{
				DialContext: (&net.Dialer{
					Timeout: 3 * time.Second,
				}).DialContext,
				MaxIdleConnsPerHost: 2,
			},
		},
	}
}

// Broadcast sends the given text to all configured peers in parallel.
// Errors are logged but not returned — a single unreachable peer should not
// block other peers or the daemon loop.
func (b *Broadcaster) Broadcast(text string) {
	payload := dedup.Payload{
		Text:   text,
		Ts:     time.Now().UnixNano(),
		Origin: b.origin,
	}

	body, err := json.Marshal(payload)
	if err != nil {
		log.Printf("peer: marshal payload: %v", err)
		return
	}

	for i := range b.peers {
		go b.sendToPeer(b.peers[i], body)
	}
}

func (b *Broadcaster) sendToPeer(p config.PeerConfig, body []byte) {
	url := fmt.Sprintf("http://%s%s", p.Addr, clipPath)

	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(body))
	if err != nil {
		log.Printf("peer [%s]: create request: %v", p.Name, err)
		return
	}
	req.Header.Set("Content-Type", "application/json")

	resp, err := b.client.Do(req)
	if err != nil {
		log.Printf("peer [%s] %s: %v", p.Name, p.Addr, err)
		return
	}
	resp.Body.Close()

	if resp.StatusCode != http.StatusNoContent {
		log.Printf("peer [%s] %s: unexpected status %d", p.Name, p.Addr, resp.StatusCode)
	}
}