package handlers

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

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

	"veza-backend-api/internal/core/education"
)

func TestNewEducationHandler(t *testing.T) {
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	if handler == nil {
		t.Fatal("expected non-nil handler")
	}
	if handler.service == nil {
		t.Error("expected non-nil service")
	}
}

func TestEducationHandler_CreateCourse_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/courses", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.CreateCourse(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_CreateCourse_InvalidBody(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Set("user_id", uuid.New())
	c.Request = httptest.NewRequest(http.MethodPost, "/courses", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.CreateCourse(c)

	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["success"] != false {
		t.Error("expected success=false for invalid request")
	}
}

func TestEducationHandler_GetCourse_InvalidID(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "id", Value: "not-a-uuid"}}
	c.Request = httptest.NewRequest(http.MethodGet, "/courses/not-a-uuid", nil)

	handler.GetCourse(c)

	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["success"] != false {
		t.Error("expected success=false for invalid ID")
	}
}

func TestEducationHandler_GetCourseBySlug_EmptySlug(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "slug", Value: ""}}
	c.Request = httptest.NewRequest(http.MethodGet, "/courses/slug/", nil)

	handler.GetCourseBySlug(c)

	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["success"] != false {
		t.Error("expected success=false for empty slug")
	}
}

func TestEducationHandler_Enroll_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/courses/123/enroll", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.Enroll(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_UpdateProgress_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/lessons/123/progress", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.UpdateProgress(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_IssueCertificate_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/courses/123/certificate", nil)

	handler.IssueCertificate(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_CreateReview_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/courses/123/reviews", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.CreateReview(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_GetMyEnrollments_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodGet, "/enrollments", nil)

	handler.GetMyEnrollments(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_UploadLessonVideo_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/courses/123/lessons/456/video", nil)
	c.Request.Header.Set("Content-Type", "multipart/form-data")

	handler.UploadLessonVideo(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_UploadLessonVideo_InvalidCourseID(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Set("user_id", uuid.New())
	c.Params = gin.Params{{Key: "id", Value: "not-a-uuid"}}
	c.Request = httptest.NewRequest(http.MethodPost, "/courses/not-a-uuid/lessons/456/video", nil)

	handler.UploadLessonVideo(c)

	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["success"] != false {
		t.Error("expected success=false for invalid course ID")
	}
}

func TestEducationHandler_UploadLessonVideo_InvalidLessonID(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Set("user_id", uuid.New())
	c.Params = gin.Params{
		{Key: "id", Value: uuid.New().String()},
		{Key: "lesson_id", Value: "not-a-uuid"},
	}
	c.Request = httptest.NewRequest(http.MethodPost, "/courses/123/lessons/not-a-uuid/video", nil)

	handler.UploadLessonVideo(c)

	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["success"] != false {
		t.Error("expected success=false for invalid lesson ID")
	}
}

func TestEducationHandler_DeleteLesson_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodDelete, "/courses/123/lessons/456", nil)

	handler.DeleteLesson(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_ReorderLessons_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/courses/123/lessons/reorder", strings.NewReader(`{}`))
	c.Request.Header.Set("Content-Type", "application/json")

	handler.ReorderLessons(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_GetCourseProgress_NoAuth(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodGet, "/courses/123/progress", nil)

	handler.GetCourseProgress(c)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401, got %d", w.Code)
	}
}

func TestEducationHandler_VerifyCertificate_EmptyCode(t *testing.T) {
	gin.SetMode(gin.TestMode)
	logger := zap.NewNop()
	svc := education.NewService(nil, logger)
	handler := NewEducationHandler(svc, logger)

	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Params = gin.Params{{Key: "code", Value: ""}}
	c.Request = httptest.NewRequest(http.MethodGet, "/certificates/", nil)

	handler.VerifyCertificate(c)

	var resp map[string]interface{}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("failed to decode response: %v", err)
	}
	if resp["success"] != false {
		t.Error("expected success=false for empty code")
	}
}