package l7

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

func TestPolicyMiddlewareNoPolicies(t *testing.T) {
	called := false
	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		called = true
		w.WriteHeader(200)
	})

	handler := PolicyMiddleware(nil, next)

	req := httptest.NewRequest("GET", "/", nil)
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if !called {
		t.Fatal("next handler was not called")
	}
	if w.Code != 200 {
		t.Fatalf("status = %d, want 200", w.Code)
	}
}

func TestPolicyBlockUserAgentMatch(t *testing.T) {
	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(200)
	})

	policies := []PolicyRule{
		{Type: "block_user_agent", Value: "BadBot"},
	}
	handler := PolicyMiddleware(policies, next)

	req := httptest.NewRequest("GET", "/", nil)
	req.Header.Set("User-Agent", "Mozilla/5.0 BadBot/1.0")
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if w.Code != 403 {
		t.Fatalf("status = %d, want 403", w.Code)
	}
}

func TestPolicyBlockUserAgentNoMatch(t *testing.T) {
	called := false
	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		called = true
		w.WriteHeader(200)
	})

	policies := []PolicyRule{
		{Type: "block_user_agent", Value: "BadBot"},
	}
	handler := PolicyMiddleware(policies, next)

	req := httptest.NewRequest("GET", "/", nil)
	req.Header.Set("User-Agent", "Mozilla/5.0 GoodBrowser/1.0")
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if !called {
		t.Fatal("next handler was not called")
	}
	if w.Code != 200 {
		t.Fatalf("status = %d, want 200", w.Code)
	}
}

func TestPolicyRequireHeaderPresent(t *testing.T) {
	called := false
	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		called = true
		w.WriteHeader(200)
	})

	policies := []PolicyRule{
		{Type: "require_header", Value: "X-API-Key"},
	}
	handler := PolicyMiddleware(policies, next)

	req := httptest.NewRequest("GET", "/", nil)
	req.Header.Set("X-API-Key", "secret")
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if !called {
		t.Fatal("next handler was not called")
	}
	if w.Code != 200 {
		t.Fatalf("status = %d, want 200", w.Code)
	}
}

func TestPolicyRequireHeaderAbsent(t *testing.T) {
	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(200)
	})

	policies := []PolicyRule{
		{Type: "require_header", Value: "X-API-Key"},
	}
	handler := PolicyMiddleware(policies, next)

	req := httptest.NewRequest("GET", "/", nil)
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)

	if w.Code != 403 {
		t.Fatalf("status = %d, want 403", w.Code)
	}
}

func TestPolicyMultipleRules(t *testing.T) {
	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(200)
	})

	policies := []PolicyRule{
		{Type: "block_user_agent", Value: "BadBot"},
		{Type: "require_header", Value: "X-Token"},
	}
	handler := PolicyMiddleware(policies, next)

	// Blocked by UA even though header is present.
	req := httptest.NewRequest("GET", "/", nil)
	req.Header.Set("User-Agent", "BadBot/1.0")
	req.Header.Set("X-Token", "abc")
	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)
	if w.Code != 403 {
		t.Fatalf("UA block: status = %d, want 403", w.Code)
	}

	// Good UA but missing header.
	req2 := httptest.NewRequest("GET", "/", nil)
	req2.Header.Set("User-Agent", "GoodBot/1.0")
	w2 := httptest.NewRecorder()
	handler.ServeHTTP(w2, req2)
	if w2.Code != 403 {
		t.Fatalf("missing header: status = %d, want 403", w2.Code)
	}

	// Good UA and header present — passes.
	req3 := httptest.NewRequest("GET", "/", nil)
	req3.Header.Set("User-Agent", "GoodBot/1.0")
	req3.Header.Set("X-Token", "abc")
	w3 := httptest.NewRecorder()
	handler.ServeHTTP(w3, req3)
	if w3.Code != 200 {
		t.Fatalf("pass: status = %d, want 200", w3.Code)
	}
}