package server

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

	"galaxy/backend/internal/adminconsole"
	"galaxy/backend/internal/server/middleware/basicauth"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

func newConsoleTestRouter(t *testing.T) http.Handler {
	t.Helper()
	handler, err := NewRouter(RouterDependencies{
		Logger:        zap.NewNop(),
		AdminVerifier: basicauth.NewStaticVerifier("secret"),
		AdminConsole:  NewAdminConsoleHandlers(nil, adminconsole.NewCSRF([]byte("test-key")), nil),
	})
	if err != nil {
		t.Fatalf("NewRouter: %v", err)
	}
	return handler
}

func TestAdminConsoleRequiresAuth(t *testing.T) {
	router := newConsoleTestRouter(t)

	req := httptest.NewRequest(http.MethodGet, "/_gm/", nil)
	rec := httptest.NewRecorder()
	router.ServeHTTP(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("status = %d, want 401", rec.Code)
	}
	if got := rec.Header().Get("WWW-Authenticate"); !strings.Contains(got, "Basic") {
		t.Fatalf("WWW-Authenticate = %q, want a Basic challenge", got)
	}
}

func TestAdminConsoleDashboardRenders(t *testing.T) {
	router := newConsoleTestRouter(t)

	for _, path := range []string{"/_gm", "/_gm/"} {
		req := httptest.NewRequest(http.MethodGet, path, nil)
		req.SetBasicAuth("ops", "secret")
		rec := httptest.NewRecorder()
		router.ServeHTTP(rec, req)

		if rec.Code != http.StatusOK {
			t.Fatalf("GET %s status = %d, want 200; body=%s", path, rec.Code, rec.Body.String())
		}
		if ct := rec.Header().Get("Content-Type"); !strings.HasPrefix(ct, "text/html") {
			t.Errorf("GET %s content-type = %q, want text/html", path, ct)
		}
		body := rec.Body.String()
		if !strings.Contains(body, "Dashboard") {
			t.Errorf("GET %s body missing the dashboard heading", path)
		}
		if !strings.Contains(body, "ops") {
			t.Errorf("GET %s body missing the operator name", path)
		}
	}
}

func TestAdminConsoleServesAsset(t *testing.T) {
	router := newConsoleTestRouter(t)

	req := httptest.NewRequest(http.MethodGet, "/_gm/assets/console.css", nil)
	req.SetBasicAuth("ops", "secret")
	rec := httptest.NewRecorder()
	router.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("asset status = %d, want 200", rec.Code)
	}
	if ct := rec.Header().Get("Content-Type"); !strings.Contains(ct, "text/css") {
		t.Errorf("asset content-type = %q, want text/css", ct)
	}
}

func TestAdminConsoleRequireCSRF(t *testing.T) {
	gin.SetMode(gin.TestMode)

	csrf := adminconsole.NewCSRF([]byte("test-key"))
	console := NewAdminConsoleHandlers(nil, csrf, nil)

	engine := gin.New()
	engine.Use(func(c *gin.Context) {
		c.Request = c.Request.WithContext(basicauth.WithUsername(c.Request.Context(), "ops"))
		c.Next()
	})
	engine.Use(console.RequireCSRF())
	engine.GET("/x", func(c *gin.Context) { c.Status(http.StatusOK) })
	engine.POST("/x", func(c *gin.Context) { c.Status(http.StatusOK) })

	token := csrf.Token("ops")

	cases := []struct {
		name   string
		method string
		form   string
		origin string
		host   string
		want   int
	}{
		{"get is a safe method", http.MethodGet, "", "", "galaxy.lan", http.StatusOK},
		{"valid token, same origin", http.MethodPost, "_csrf=" + token, "https://galaxy.lan", "galaxy.lan", http.StatusOK},
		{"valid token, no origin header", http.MethodPost, "_csrf=" + token, "", "galaxy.lan", http.StatusOK},
		{"missing token", http.MethodPost, "", "https://galaxy.lan", "galaxy.lan", http.StatusForbidden},
		{"wrong token", http.MethodPost, "_csrf=bogus", "https://galaxy.lan", "galaxy.lan", http.StatusForbidden},
		{"cross-origin", http.MethodPost, "_csrf=" + token, "https://evil.example", "galaxy.lan", http.StatusForbidden},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			var body io.Reader
			if tc.form != "" {
				body = strings.NewReader(tc.form)
			}
			req := httptest.NewRequest(tc.method, "/x", body)
			if tc.form != "" {
				req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
			}
			if tc.origin != "" {
				req.Header.Set("Origin", tc.origin)
			}
			req.Host = tc.host

			rec := httptest.NewRecorder()
			engine.ServeHTTP(rec, req)

			if rec.Code != tc.want {
				t.Fatalf("status = %d, want %d (body=%s)", rec.Code, tc.want, rec.Body.String())
			}
		})
	}
}