package middleware

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

	"with_you/internal/model"
	"with_you/internal/service"

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

// stubUserService 通过嵌入 service.UserService 接口（nil）仅覆盖 GetUserByID。
// 未覆盖方法若被调用会 panic，可在测试中暴露非预期的依赖调用。
type stubUserService struct {
	service.UserService // nil 嵌入

	user *model.User
	err  error
}

func (s *stubUserService) GetUserByID(ctx context.Context, id string) (*model.User, error) {
	if s.err != nil {
		return nil, s.err
	}
	return s.user, nil
}

// runMiddleware 构造一个 gin 引擎，挂载 RequireVerified + 一个标记 handler，
// 发起请求并返回 (status, body, nextCalled)。
func runMiddleware(t *testing.T, svc service.UserService, setUserID bool, userID any) (int, bool) {
	t.Helper()
	gin.SetMode(gin.TestMode)

	nextCalled := false
	r := gin.New()
	r.Use(func(c *gin.Context) {
		if setUserID {
			c.Set("user_id", userID)
		}
		c.Next()
	})
	r.GET("/test", RequireVerified(svc), func(c *gin.Context) {
		nextCalled = true
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	r.ServeHTTP(w, req)

	return w.Code, nextCalled
}

// TestRequireVerified_Approved 已认证用户 → 放行（200，next 被调用）。
func TestRequireVerified_Approved(t *testing.T) {
	svc := &stubUserService{
		user: &model.User{ID: "u1", VerificationStatus: model.VerificationStatusApproved},
	}
	code, next := runMiddleware(t, svc, true, "u1")
	if code != http.StatusOK {
		t.Errorf("status = %d, want %d", code, http.StatusOK)
	}
	if !next {
		t.Error("next handler should be called for verified user")
	}
}

// TestRequireVerified_NotApproved 未通过认证用户 → 403 VERIFICATION_REQUIRED。
func TestRequireVerified_NotApproved(t *testing.T) {
	svc := &stubUserService{
		user: &model.User{ID: "u1", VerificationStatus: model.VerificationStatusPending},
	}
	code, next := runMiddleware(t, svc, true, "u1")
	if code != http.StatusForbidden {
		t.Errorf("status = %d, want %d", code, http.StatusForbidden)
	}
	if next {
		t.Error("next handler should NOT be called for unverified user")
	}
}

// TestRequireVerified_UserLookupError 查询用户失败 → 500。
func TestRequireVerified_UserLookupError(t *testing.T) {
	svc := &stubUserService{err: errors.New("db down")}
	code, next := runMiddleware(t, svc, true, "u1")
	if code != http.StatusInternalServerError {
		t.Errorf("status = %d, want %d", code, http.StatusInternalServerError)
	}
	if next {
		t.Error("next handler should NOT be called on lookup error")
	}
}

// TestRequireVerified_NoUserID 未登录（无 user_id）→ 401。
func TestRequireVerified_NoUserID(t *testing.T) {
	svc := &stubUserService{
		user: &model.User{ID: "u1", VerificationStatus: model.VerificationStatusApproved},
	}
	code, next := runMiddleware(t, svc, false, nil)
	if code != http.StatusUnauthorized {
		t.Errorf("status = %d, want %d", code, http.StatusUnauthorized)
	}
	if next {
		t.Error("next handler should NOT be called when user_id missing")
	}
}