package middleware

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
)

func TestRateLimitAllowsUnderLimit(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.Use(RateLimit())
	router.GET("/test", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	for i := 0; i < 10; i++ {
		req := httptest.NewRequest(http.MethodGet, "/test", nil)
		req.RemoteAddr = "192.168.1.1:12345"
		resp := httptest.NewRecorder()
		router.ServeHTTP(resp, req)
		if resp.Code != http.StatusOK {
			t.Fatalf("request %d should be allowed, got %d", i+1, resp.Code)
		}
	}
}

func TestRateLimitBlocksOverLimit(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.Use(RateLimit())
	router.GET("/test", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	// 发送 11 个请求，第 11 个应被限流
	for i := 0; i < 11; i++ {
		req := httptest.NewRequest(http.MethodGet, "/test", nil)
		req.RemoteAddr = "192.168.1.2:12345"
		resp := httptest.NewRecorder()
		router.ServeHTTP(resp, req)
		if i < 10 && resp.Code != http.StatusOK {
			t.Fatalf("request %d should be allowed, got %d", i+1, resp.Code)
		}
		if i == 10 && resp.Code != http.StatusTooManyRequests {
			t.Fatalf("request 11 should be rate limited, got %d", resp.Code)
		}
	}
}

func TestRateLimitWindowReset(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.Use(RateLimit())
	router.GET("/test", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	// 先发送 10 个请求达到上限
	for i := 0; i < 10; i++ {
		req := httptest.NewRequest(http.MethodGet, "/test", nil)
		req.RemoteAddr = "192.168.1.3:12345"
		resp := httptest.NewRecorder()
		router.ServeHTTP(resp, req)
	}

	// 模拟时间过去 61 秒（超过 1 分钟窗口）
	// 注意：由于实现使用真实时间，这里只能验证当前窗口内的行为
	// 实际窗口重置测试需要 mock 时间或等待
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.RemoteAddr = "192.168.1.3:12345"
	resp := httptest.NewRecorder()
	router.ServeHTTP(resp, req)
	if resp.Code != http.StatusTooManyRequests {
		t.Fatalf("should still be rate limited within window, got %d", resp.Code)
	}
}

func TestAuthRejectsMissingToken(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.Use(Auth())
	router.GET("/protected", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	req := httptest.NewRequest(http.MethodGet, "/protected", nil)
	resp := httptest.NewRecorder()
	router.ServeHTTP(resp, req)
	if resp.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", resp.Code)
	}
}

func TestAuthRejectsMalformedToken(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.Use(Auth())
	router.GET("/protected", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	req := httptest.NewRequest(http.MethodGet, "/protected", nil)
	req.Header.Set("Authorization", "InvalidFormat token123")
	resp := httptest.NewRecorder()
	router.ServeHTTP(resp, req)
	if resp.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401, got %d", resp.Code)
	}
}

func TestCORSAllowsConfiguredOrigin(t *testing.T) {
	gin.SetMode(gin.TestMode)
	t.Setenv("CORS_ORIGINS", "https://example.com,https://app.example.com")
	router := gin.New()
	router.Use(CORS())
	router.GET("/api/test", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	req := httptest.NewRequest(http.MethodGet, "/api/test", nil)
	req.Header.Set("Origin", "https://example.com")
	resp := httptest.NewRecorder()
	router.ServeHTTP(resp, req)
	if resp.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", resp.Code)
	}
	if resp.Header().Get("Access-Control-Allow-Origin") != "https://example.com" {
		t.Fatalf("expected CORS header for allowed origin, got %s", resp.Header().Get("Access-Control-Allow-Origin"))
	}
}

func TestCORSRejectsUnconfiguredOrigin(t *testing.T) {
	gin.SetMode(gin.TestMode)
	t.Setenv("CORS_ORIGINS", "https://example.com")
	router := gin.New()
	router.Use(CORS())
	router.GET("/api/test", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	req := httptest.NewRequest(http.MethodGet, "/api/test", nil)
	req.Header.Set("Origin", "https://evil.com")
	resp := httptest.NewRecorder()
	router.ServeHTTP(resp, req)
	// 非白名单源不应返回 CORS 头
	if resp.Header().Get("Access-Control-Allow-Origin") == "https://evil.com" {
		t.Fatal("should not allow unconfigured origin")
	}
}