package handler

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

	"img_infinite_canvas/internal/domain/design"
	sharingmodule "img_infinite_canvas/internal/modules/sharing"
)

type fakeBearerAuthenticator struct{}

func (fakeBearerAuthenticator) UserIDFromBearer(_ context.Context, authorization string) (string, bool) {
	if authorization == "Bearer valid" {
		return "91cd197b-8255-4172-9981-77391fd38f33", true
	}
	return "", false
}

type fakeShareAuthorizer struct {
	access sharingmodule.Access
	err    error
}

func (f fakeShareAuthorizer) ResolveAccess(_ context.Context, _ string, _ sharingmodule.Actor) (sharingmodule.Access, error) {
	return f.access, f.err
}

func TestUserContextMiddlewareUsesAuthorizationHeader(t *testing.T) {
	req := httptest.NewRequest(http.MethodGet, "/api/projects", nil)
	req.Header.Set("Authorization", "Bearer valid")
	rec := httptest.NewRecorder()

	called := false
	UserContextMiddleware(fakeBearerAuthenticator{})(func(w http.ResponseWriter, r *http.Request) {
		called = true
		if got := design.UserIDFromContext(r.Context()); got != "91cd197b-8255-4172-9981-77391fd38f33" {
			t.Fatalf("expected authenticated user in context, got %s", got)
		}
		w.WriteHeader(http.StatusNoContent)
	})(rec, req)

	if !called {
		t.Fatal("expected next handler to be called")
	}
	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected status %d, got %d", http.StatusNoContent, rec.Code)
	}
}

func TestUserContextMiddlewareIgnoresLegacyTokenHeaderAndCookie(t *testing.T) {
	req := httptest.NewRequest(http.MethodGet, "/api/projects", nil)
	req.Header.Set("token", "valid")
	req.AddCookie(&http.Cookie{Name: "usertoken", Value: "valid"})
	rec := httptest.NewRecorder()

	called := false
	UserContextMiddleware(fakeBearerAuthenticator{})(func(w http.ResponseWriter, r *http.Request) {
		called = true
	})(rec, req)

	if called {
		t.Fatal("expected next handler not to be called")
	}
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected status %d, got %d", http.StatusUnauthorized, rec.Code)
	}
}

func TestUserContextMiddlewareIgnoresSpoofedUserIDOnPublicRoute(t *testing.T) {
	req := httptest.NewRequest(http.MethodGet, "/api/dashboard", nil)
	req.Header.Set("X-User-Id", "91cd197b-8255-4172-9981-77391fd38f33")
	rec := httptest.NewRecorder()

	UserContextMiddleware(fakeBearerAuthenticator{})(func(w http.ResponseWriter, r *http.Request) {
		if got := design.UserIDFromContext(r.Context()); got != design.DefaultUserID {
			t.Fatalf("expected spoofed identity to be ignored, got %s", got)
		}
		w.WriteHeader(http.StatusNoContent)
	})(rec, req)

	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected public route to continue, got %d", rec.Code)
	}
}

func TestUserContextMiddlewareAuthorizesAnonymousCanvasShare(t *testing.T) {
	ownerID := "d1d2fbbb-97bb-4406-8d0b-ec814cc65092"
	authorizer := fakeShareAuthorizer{access: sharingmodule.Access{
		ProjectID:    "project-1",
		OwnerID:      ownerID,
		Permission:   sharingmodule.PermissionCanvas,
		Capabilities: sharingmodule.PermissionCanvas.Capabilities(),
	}}
	req := httptest.NewRequest(http.MethodGet, "/api/projects/project-1", nil)
	req.Header.Set("X-Share-Id", "XhRewKnS4it7X9kEMFLcdVJentg")
	rec := httptest.NewRecorder()

	UserContextMiddleware(fakeBearerAuthenticator{}, authorizer)(func(w http.ResponseWriter, r *http.Request) {
		if got := design.UserIDFromContext(r.Context()); got != ownerID {
			t.Fatalf("expected owner-scoped repository context, got %s", got)
		}
		if _, ok := sharingmodule.AccessFromContext(r.Context()); !ok {
			t.Fatal("expected effective share access in context")
		}
		w.WriteHeader(http.StatusNoContent)
	})(rec, req)

	if rec.Code != http.StatusNoContent {
		t.Fatalf("expected shared read to continue, got %d", rec.Code)
	}
}

func TestUserContextMiddlewareDeniesCanvasShareChatHistory(t *testing.T) {
	authorizer := fakeShareAuthorizer{access: sharingmodule.Access{
		ProjectID:    "project-1",
		OwnerID:      "d1d2fbbb-97bb-4406-8d0b-ec814cc65092",
		Permission:   sharingmodule.PermissionCanvas,
		Capabilities: sharingmodule.PermissionCanvas.Capabilities(),
	}}
	req := httptest.NewRequest(http.MethodGet, "/api/projects/project-1/history", nil)
	req.Header.Set("X-Share-Id", "XhRewKnS4it7X9kEMFLcdVJentg")
	rec := httptest.NewRecorder()
	called := false

	UserContextMiddleware(fakeBearerAuthenticator{}, authorizer)(func(http.ResponseWriter, *http.Request) {
		called = true
	})(rec, req)

	if called {
		t.Fatal("expected canvas-only chat history to be blocked")
	}
	if rec.Code != http.StatusForbidden {
		t.Fatalf("expected forbidden, got %d", rec.Code)
	}
}

func TestUserContextMiddlewareDoesNotLetHeaderOverridePathProject(t *testing.T) {
	authorizer := fakeShareAuthorizer{access: sharingmodule.Access{
		ProjectID:    "shared-project",
		OwnerID:      "d1d2fbbb-97bb-4406-8d0b-ec814cc65092",
		Permission:   sharingmodule.PermissionEditor,
		Capabilities: sharingmodule.PermissionEditor.Capabilities(),
	}}
	req := httptest.NewRequest(http.MethodGet, "/api/projects/other-project", nil)
	req.Header.Set("X-Share-Id", "XhRewKnS4it7X9kEMFLcdVJentg")
	req.Header.Set("X-Share-Project-Id", "shared-project")
	rec := httptest.NewRecorder()
	called := false

	UserContextMiddleware(fakeBearerAuthenticator{}, authorizer)(func(http.ResponseWriter, *http.Request) {
		called = true
	})(rec, req)

	if called {
		t.Fatal("expected mismatched path project to be blocked")
	}
	if rec.Code != http.StatusNotFound {
		t.Fatalf("expected not found, got %d", rec.Code)
	}
}

func TestUserContextMiddlewareRequiresEditorForGeneratorTasks(t *testing.T) {
	authorizer := fakeShareAuthorizer{access: sharingmodule.Access{
		ProjectID:    "project-1",
		OwnerID:      "d1d2fbbb-97bb-4406-8d0b-ec814cc65092",
		Permission:   sharingmodule.PermissionViewer,
		Capabilities: sharingmodule.PermissionViewer.Capabilities(),
	}}
	req := httptest.NewRequest(http.MethodGet, "/api/generator/tasks?project_id=project-1&task_id=task-1", nil)
	req.Header.Set("X-Share-Id", "XhRewKnS4it7X9kEMFLcdVJentg")
	rec := httptest.NewRecorder()

	UserContextMiddleware(fakeBearerAuthenticator{}, authorizer)(func(http.ResponseWriter, *http.Request) {
		t.Fatal("expected viewer generator access to be blocked")
	})(rec, req)

	if rec.Code != http.StatusForbidden {
		t.Fatalf("expected forbidden, got %d", rec.Code)
	}
}

func TestUserContextMiddlewareProtectsV1Routes(t *testing.T) {
	req := httptest.NewRequest(http.MethodPost, "/v1/generator/tasks", nil)
	rec := httptest.NewRecorder()
	called := false

	UserContextMiddleware(fakeBearerAuthenticator{})(func(http.ResponseWriter, *http.Request) {
		called = true
	})(rec, req)

	if called {
		t.Fatal("expected v1 route to require authentication")
	}
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected unauthorized, got %d", rec.Code)
	}
}