package savedrecipe_test

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/food-ai/backend/internal/domain/savedrecipe"
	savedrecipemocks "github.com/food-ai/backend/internal/domain/savedrecipe/mocks"
	"github.com/food-ai/backend/internal/infra/middleware"
	"github.com/go-chi/chi/v5"
)

type alwaysAuthValidator struct{ userID string }

func (v *alwaysAuthValidator) ValidateAccessToken(_ string) (*middleware.TokenClaims, error) {
	return &middleware.TokenClaims{UserID: v.userID}, nil
}

func buildRouter(handler *savedrecipe.Handler, userID string) *chi.Mux {
	router := chi.NewRouter()
	router.Use(middleware.Auth(&alwaysAuthValidator{userID: userID}))
	router.Post("/saved-recipes", handler.Save)
	router.Get("/saved-recipes", handler.List)
	router.Get("/saved-recipes/{id}", handler.GetByID)
	router.Delete("/saved-recipes/{id}", handler.Delete)
	return router
}

func authorizedRequest(method, target string, body []byte) *http.Request {
	request := httptest.NewRequest(method, target, bytes.NewReader(body))
	request.Header.Set("Authorization", "Bearer test-token")
	request.Header.Set("Content-Type", "application/json")
	return request
}

func makeUserSavedRecipe(id string) *savedrecipe.UserSavedRecipe {
	return &savedrecipe.UserSavedRecipe{
		ID:          id,
		UserID:      "user-1",
		RecipeID:    "recipe-1",
		SavedAt:     time.Now(),
		DishName:    "Pasta Carbonara",
		Ingredients: []savedrecipe.RecipeIngredient{},
		Steps:       []savedrecipe.RecipeStep{},
		Tags:        []string{},
	}
}

func TestSave_MissingTitleAndRecipeID(t *testing.T) {
	handler := savedrecipe.NewHandler(&savedrecipemocks.MockSavedRecipeRepository{})
	router := buildRouter(handler, "user-1")

	body, _ := json.Marshal(map[string]string{"cuisine": "italian"})
	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodPost, "/saved-recipes", body))

	if recorder.Code != http.StatusBadRequest {
		t.Errorf("expected 400, got %d", recorder.Code)
	}
}

func TestSave_WithTitle(t *testing.T) {
	mockRepo := &savedrecipemocks.MockSavedRecipeRepository{
		SaveFn: func(ctx context.Context, userID string, req savedrecipe.SaveRequest) (*savedrecipe.UserSavedRecipe, error) {
			return makeUserSavedRecipe("saved-1"), nil
		},
	}
	handler := savedrecipe.NewHandler(mockRepo)
	router := buildRouter(handler, "user-1")

	body, _ := json.Marshal(savedrecipe.SaveRequest{Title: "My Recipe"})
	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodPost, "/saved-recipes", body))

	if recorder.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d", recorder.Code)
	}
}

func TestSave_WithRecipeID(t *testing.T) {
	mockRepo := &savedrecipemocks.MockSavedRecipeRepository{
		SaveFn: func(ctx context.Context, userID string, req savedrecipe.SaveRequest) (*savedrecipe.UserSavedRecipe, error) {
			return makeUserSavedRecipe("saved-2"), nil
		},
	}
	handler := savedrecipe.NewHandler(mockRepo)
	router := buildRouter(handler, "user-1")

	body, _ := json.Marshal(savedrecipe.SaveRequest{RecipeID: "recipe-42"})
	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodPost, "/saved-recipes", body))

	if recorder.Code != http.StatusCreated {
		t.Errorf("expected 201, got %d", recorder.Code)
	}
}

func TestList_Success(t *testing.T) {
	mockRepo := &savedrecipemocks.MockSavedRecipeRepository{
		ListFn: func(ctx context.Context, userID string) ([]*savedrecipe.UserSavedRecipe, error) {
			return []*savedrecipe.UserSavedRecipe{makeUserSavedRecipe("saved-1")}, nil
		},
	}
	handler := savedrecipe.NewHandler(mockRepo)
	router := buildRouter(handler, "user-1")

	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodGet, "/saved-recipes", nil))

	if recorder.Code != http.StatusOK {
		t.Errorf("expected 200, got %d", recorder.Code)
	}
}

func TestGetByID_NotFound(t *testing.T) {
	mockRepo := &savedrecipemocks.MockSavedRecipeRepository{
		GetByIDFn: func(ctx context.Context, userID, id string) (*savedrecipe.UserSavedRecipe, error) {
			return nil, nil
		},
	}
	handler := savedrecipe.NewHandler(mockRepo)
	router := buildRouter(handler, "user-1")

	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodGet, "/saved-recipes/nonexistent", nil))

	if recorder.Code != http.StatusNotFound {
		t.Errorf("expected 404, got %d", recorder.Code)
	}
}

func TestGetByID_Success(t *testing.T) {
	mockRepo := &savedrecipemocks.MockSavedRecipeRepository{
		GetByIDFn: func(ctx context.Context, userID, id string) (*savedrecipe.UserSavedRecipe, error) {
			return makeUserSavedRecipe(id), nil
		},
	}
	handler := savedrecipe.NewHandler(mockRepo)
	router := buildRouter(handler, "user-1")

	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodGet, "/saved-recipes/saved-1", nil))

	if recorder.Code != http.StatusOK {
		t.Errorf("expected 200, got %d", recorder.Code)
	}
}

func TestDelete_NotFound(t *testing.T) {
	mockRepo := &savedrecipemocks.MockSavedRecipeRepository{
		DeleteFn: func(ctx context.Context, userID, id string) error {
			return savedrecipe.ErrNotFound
		},
	}
	handler := savedrecipe.NewHandler(mockRepo)
	router := buildRouter(handler, "user-1")

	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodDelete, "/saved-recipes/nonexistent", nil))

	if recorder.Code != http.StatusNotFound {
		t.Errorf("expected 404, got %d", recorder.Code)
	}
}

func TestDelete_Success(t *testing.T) {
	mockRepo := &savedrecipemocks.MockSavedRecipeRepository{
		DeleteFn: func(ctx context.Context, userID, id string) error {
			return nil
		},
	}
	handler := savedrecipe.NewHandler(mockRepo)
	router := buildRouter(handler, "user-1")

	recorder := httptest.NewRecorder()
	router.ServeHTTP(recorder, authorizedRequest(http.MethodDelete, "/saved-recipes/saved-1", nil))

	if recorder.Code != http.StatusNoContent {
		t.Errorf("expected 204, got %d", recorder.Code)
	}
}