package chat

import (
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"go.uber.org/zap/zaptest"
)

func TestRateLimiter_InMemoryFallback_AllowsWithinLimit(t *testing.T) {
	logger := zaptest.NewLogger(t)
	rl := NewRateLimiter(nil, logger)

	userID := uuid.New()
	for i := 0; i < 10; i++ {
		assert.True(t, rl.Allow(userID, "send_message"), "request %d should be allowed", i+1)
	}
	assert.False(t, rl.Allow(userID, "send_message"), "11th request should be denied")
}

func TestRateLimiter_InMemoryFallback_WindowReset(t *testing.T) {
	logger := zaptest.NewLogger(t)
	rl := NewRateLimiter(nil, logger)

	rl.limits["test_action"] = rateConfig{maxRequests: 2, window: 50 * time.Millisecond}

	userID := uuid.New()
	assert.True(t, rl.Allow(userID, "test_action"))
	assert.True(t, rl.Allow(userID, "test_action"))
	assert.False(t, rl.Allow(userID, "test_action"))

	time.Sleep(60 * time.Millisecond)
	assert.True(t, rl.Allow(userID, "test_action"), "should allow after window reset")
}

func TestRateLimiter_UnknownAction_AlwaysAllowed(t *testing.T) {
	logger := zaptest.NewLogger(t)
	rl := NewRateLimiter(nil, logger)

	userID := uuid.New()
	for i := 0; i < 100; i++ {
		assert.True(t, rl.Allow(userID, "unknown_action"))
	}
}

func TestRateLimiter_DifferentUsers_IndependentLimits(t *testing.T) {
	logger := zaptest.NewLogger(t)
	rl := NewRateLimiter(nil, logger)

	user1 := uuid.New()
	user2 := uuid.New()

	for i := 0; i < 10; i++ {
		assert.True(t, rl.Allow(user1, "send_message"))
	}
	assert.False(t, rl.Allow(user1, "send_message"))

	assert.True(t, rl.Allow(user2, "send_message"), "user2 should be independent of user1")
}

func TestRateLimiter_DifferentActions_IndependentLimits(t *testing.T) {
	logger := zaptest.NewLogger(t)
	rl := NewRateLimiter(nil, logger)

	userID := uuid.New()

	for i := 0; i < 10; i++ {
		assert.True(t, rl.Allow(userID, "send_message"))
	}
	assert.False(t, rl.Allow(userID, "send_message"))

	assert.True(t, rl.Allow(userID, "typing"), "typing should be independent of send_message")
}