package bridge

import (
	"context"
	"sync"
	"testing"
	"time"

	"git.daviestechlabs.io/daviestechlabs/ntfy-discord/internal/ntfy"
)

func TestBridge_IsReady(t *testing.T) {
	// Create a minimal bridge for testing ready state
	b := &Bridge{}

	// Initially not ready
	if b.IsReady() {
		t.Error("bridge should not be ready before Run()")
	}

	// Set ready
	b.ready.Store(true)
	if !b.IsReady() {
		t.Error("bridge should be ready after ready.Store(true)")
	}

	// Unset ready
	b.ready.Store(false)
	if b.IsReady() {
		t.Error("bridge should not be ready after ready.Store(false)")
	}
}

func TestMetricsRegistered(t *testing.T) {
	// Verify metrics are registered by checking they're not nil
	if messagesReceived == nil {
		t.Error("messagesReceived metric not registered")
	}
	if messagesSent == nil {
		t.Error("messagesSent metric not registered")
	}
	if messagesErrors == nil {
		t.Error("messagesErrors metric not registered")
	}
}

// Test that Bridge correctly uses the ready atomic
func TestBridge_ReadyState_Concurrent(t *testing.T) {
	b := &Bridge{}

	// Test concurrent access
	var wg sync.WaitGroup
	for i := 0; i < 100; i++ {
		wg.Add(2)
		go func() {
			defer wg.Done()
			b.ready.Store(true)
		}()
		go func() {
			defer wg.Done()
			_ = b.IsReady()
		}()
	}
	wg.Wait()

	// Should not have any race conditions
}

// Test message channel buffer
func TestMessageChannelBuffer(t *testing.T) {
	msgCh := make(chan ntfy.Message, 100)

	// Should be able to buffer 100 messages without blocking
	for i := 0; i < 100; i++ {
		select {
		case msgCh <- ntfy.Message{ID: "test"}:
			// OK
		default:
			t.Fatalf("channel blocked at message %d", i)
		}
	}

	// 101st should block (use select to avoid blocking test)
	select {
	case msgCh <- ntfy.Message{ID: "overflow"}:
		t.Error("channel should be full")
	default:
		// Expected - channel full
	}
}

// Test context cancellation behavior
func TestContextCancellation(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())

	done := make(chan struct{})
	go func() {
		// Simulate Run() loop behavior
		select {
		case <-ctx.Done():
			close(done)
		case <-time.After(5 * time.Second):
			// Should not reach here
		}
	}()

	cancel()

	select {
	case <-done:
		// Success
	case <-time.After(time.Second):
		t.Error("context cancellation not handled")
	}
}