package expiry

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

	"github.com/gin-gonic/gin"

	"wx_service/internal/middleware"
	"wx_service/internal/model"
)

type apiResponse struct {
	Code    int             `json:"code"`
	Message string          `json:"message"`
	Data    json.RawMessage `json:"data"`
}

func newTestRouter(t *testing.T) *gin.Engine {
	t.Helper()
	gin.SetMode(gin.TestMode)

	db := newTestDB(t)
	repo := NewRepository(db)
	service := NewService(repo)
	handler := NewHandler(service)

	r := gin.New()
	r.Use(func(c *gin.Context) {
		c.Set(middleware.ContextCurrentUserKey, &model.User{ID: 1, MiniProgramID: 1})
		c.Next()
	})

	api := r.Group("/api/expiry")
	{
		api.GET("/summary", handler.GetSummary)
		api.GET("/items", handler.GetItems)
		api.POST("/items", handler.CreateItem)
		api.PUT("/items/:id", handler.UpdateItem)
		api.DELETE("/items/:id", handler.DeleteItem)
		api.POST("/items/:id/status", handler.UpdateStatus)
		api.GET("/settings", handler.GetSettings)
		api.POST("/settings", handler.UpdateSettings)
	}

	return r
}

func requestJSON(t *testing.T, r http.Handler, method, path string, body interface{}) *httptest.ResponseRecorder {
	t.Helper()

	var payload []byte
	if body != nil {
		var err error
		payload, err = json.Marshal(body)
		if err != nil {
			t.Fatalf("marshal body: %v", err)
		}
	}

	req := httptest.NewRequest(method, path, bytes.NewReader(payload))
	req.Header.Set("Content-Type", "application/json")

	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	return w
}

func decodeResponse(t *testing.T, w *httptest.ResponseRecorder) apiResponse {
	t.Helper()

	var resp apiResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode response: %v, body=%s", err, w.Body.String())
	}
	return resp
}

func TestHandler_ItemsFlow(t *testing.T) {
	r := newTestRouter(t)

	createResp := requestJSON(t, r, http.MethodPost, "/api/expiry/items", map[string]interface{}{
		"name":        "酸奶",
		"category":    "food",
		"expiry_date": "2030-06-01",
		"quantity":    2,
		"location":    "冰箱",
	})

	if createResp.Code != http.StatusOK {
		t.Fatalf("create status code = %d, body=%s", createResp.Code, createResp.Body.String())
	}

	createBody := decodeResponse(t, createResp)
	if createBody.Code != 0 {
		t.Fatalf("create business code = %d", createBody.Code)
	}

	var created struct {
		ID uint `json:"id"`
	}
	if err := json.Unmarshal(createBody.Data, &created); err != nil {
		t.Fatalf("decode create data: %v", err)
	}
	if created.ID == 0 {
		t.Fatalf("expected created id > 0")
	}

	updateResp := requestJSON(t, r, http.MethodPut, "/api/expiry/items/1", map[string]interface{}{
		"name":        "酸奶(更新)",
		"category":    "food",
		"expiry_date": "2030-06-02",
		"quantity":    1,
	})
	if updateResp.Code != http.StatusOK {
		t.Fatalf("update status code = %d, body=%s", updateResp.Code, updateResp.Body.String())
	}

	notFoundUpdateResp := requestJSON(t, r, http.MethodPut, "/api/expiry/items/999", map[string]interface{}{
		"name":        "不存在",
		"category":    "food",
		"expiry_date": "2030-06-02",
		"quantity":    1,
	})
	if notFoundUpdateResp.Code != http.StatusNotFound {
		t.Fatalf("update not found code = %d, body=%s", notFoundUpdateResp.Code, notFoundUpdateResp.Body.String())
	}

	listResp := requestJSON(t, r, http.MethodGet, "/api/expiry/items?status=all&page=1&page_size=20", nil)
	if listResp.Code != http.StatusOK {
		t.Fatalf("list status code = %d, body=%s", listResp.Code, listResp.Body.String())
	}

	listBody := decodeResponse(t, listResp)
	if listBody.Code != 0 {
		t.Fatalf("list business code = %d", listBody.Code)
	}

	statusResp := requestJSON(t, r, http.MethodPost, "/api/expiry/items/1/status", map[string]string{
		"status": "used",
	})
	if statusResp.Code != http.StatusOK {
		t.Fatalf("status update code = %d, body=%s", statusResp.Code, statusResp.Body.String())
	}

	delResp := requestJSON(t, r, http.MethodDelete, "/api/expiry/items/1", nil)
	if delResp.Code != http.StatusOK {
		t.Fatalf("delete code = %d, body=%s", delResp.Code, delResp.Body.String())
	}
}

func TestHandler_SettingsAndSummary(t *testing.T) {
	r := newTestRouter(t)

	settingsResp := requestJSON(t, r, http.MethodGet, "/api/expiry/settings", nil)
	if settingsResp.Code != http.StatusOK {
		t.Fatalf("get settings code=%d body=%s", settingsResp.Code, settingsResp.Body.String())
	}
	settingsBody := decodeResponse(t, settingsResp)
	if settingsBody.Code != 0 {
		t.Fatalf("get settings business code=%d", settingsBody.Code)
	}

	updateSettingsResp := requestJSON(t, r, http.MethodPost, "/api/expiry/settings", map[string]interface{}{
		"remind_days": []int{10, 5, 1},
	})
	if updateSettingsResp.Code != http.StatusOK {
		t.Fatalf("update settings code=%d body=%s", updateSettingsResp.Code, updateSettingsResp.Body.String())
	}
	updateSettingsBody := decodeResponse(t, updateSettingsResp)
	if updateSettingsBody.Code != 0 {
		t.Fatalf("update settings business code=%d", updateSettingsBody.Code)
	}

	summaryResp := requestJSON(t, r, http.MethodGet, "/api/expiry/summary", nil)
	if summaryResp.Code != http.StatusOK {
		t.Fatalf("summary code=%d body=%s", summaryResp.Code, summaryResp.Body.String())
	}
	summaryBody := decodeResponse(t, summaryResp)
	if summaryBody.Code != 0 {
		t.Fatalf("summary business code=%d", summaryBody.Code)
	}
}

func TestHandler_BadRequest(t *testing.T) {
	r := newTestRouter(t)

	badCreate := requestJSON(t, r, http.MethodPost, "/api/expiry/items", map[string]interface{}{
		"name":     "",
		"category": "food",
	})
	if badCreate.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d body=%s", badCreate.Code, badCreate.Body.String())
	}

	badSettings := requestJSON(t, r, http.MethodPost, "/api/expiry/settings", map[string]interface{}{
		"remind_days": []int{0},
	})
	if badSettings.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d body=%s", badSettings.Code, badSettings.Body.String())
	}
}