package handler

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

	"gcy_hpc_server/internal/model"
	"gcy_hpc_server/internal/service"
	"gcy_hpc_server/internal/store"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	gormlogger "gorm.io/gorm/logger"
)

func setupFolderHandler() (*FolderHandler, *gorm.DB) {
	db, _ := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{Logger: gormlogger.Default.LogMode(gormlogger.Silent)})
	db.AutoMigrate(&model.Folder{}, &model.File{})
	folderStore := store.NewFolderStore(db)
	fileStore := store.NewFileStore(db)
	svc := service.NewFolderService(folderStore, fileStore, zap.NewNop())
	h := NewFolderHandler(svc, zap.NewNop())
	return h, db
}

func setupFolderRouter(h *FolderHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	v1 := r.Group("/api/v1")
	folders := v1.Group("/files/folders")
	folders.POST("", h.CreateFolder)
	folders.GET("/:id", h.GetFolder)
	folders.GET("", h.ListFolders)
	folders.DELETE("/:id", h.DeleteFolder)
	return r
}

func createTestFolder(h *FolderHandler, r *gin.Engine) int64 {
	body, _ := json.Marshal(model.CreateFolderRequest{Name: "test-folder"})
	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/files/folders", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	data := resp["data"].(map[string]interface{})
	return int64(data["id"].(float64))
}

func TestCreateFolder_Success(t *testing.T) {
	h, _ := setupFolderHandler()
	r := setupFolderRouter(h)

	body, _ := json.Marshal(model.CreateFolderRequest{Name: "my-folder"})
	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/files/folders", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("expected 201, got %d: %s", w.Code, w.Body.String())
	}
	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	if !resp["success"].(bool) {
		t.Fatal("expected success=true")
	}
	data := resp["data"].(map[string]interface{})
	if data["name"] != "my-folder" {
		t.Fatalf("expected name=my-folder, got %v", data["name"])
	}
	if data["path"] != "/my-folder/" {
		t.Fatalf("expected path=/my-folder/, got %v", data["path"])
	}
}

func TestCreateFolder_PathTraversal(t *testing.T) {
	h, _ := setupFolderHandler()
	r := setupFolderRouter(h)

	body, _ := json.Marshal(model.CreateFolderRequest{Name: ".."})
	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/files/folders", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d: %s", w.Code, w.Body.String())
	}
}

func TestCreateFolder_MissingName(t *testing.T) {
	h, _ := setupFolderHandler()
	r := setupFolderRouter(h)

	body, _ := json.Marshal(map[string]interface{}{})
	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/files/folders", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d: %s", w.Code, w.Body.String())
	}
}

func TestGetFolder_Success(t *testing.T) {
	h, _ := setupFolderHandler()
	r := setupFolderRouter(h)

	id := createTestFolder(h, r)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/files/folders/"+itoa(id), nil)
	r.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
	}
	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	data := resp["data"].(map[string]interface{})
	if data["name"] != "test-folder" {
		t.Fatalf("expected name=test-folder, got %v", data["name"])
	}
}

func TestGetFolder_NotFound(t *testing.T) {
	h, _ := setupFolderHandler()
	r := setupFolderRouter(h)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/files/folders/999", nil)
	r.ServeHTTP(w, req)

	if w.Code != http.StatusNotFound {
		t.Fatalf("expected 404, got %d: %s", w.Code, w.Body.String())
	}
}

func TestListFolders_Success(t *testing.T) {
	h, _ := setupFolderHandler()
	r := setupFolderRouter(h)

	createTestFolder(h, r)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/files/folders", nil)
	r.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
	}
	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	if !resp["success"].(bool) {
		t.Fatal("expected success=true")
	}
	data := resp["data"].([]interface{})
	if len(data) < 1 {
		t.Fatal("expected at least 1 folder")
	}
}

func TestDeleteFolder_Success(t *testing.T) {
	h, _ := setupFolderHandler()
	r := setupFolderRouter(h)

	id := createTestFolder(h, r)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/files/folders/"+itoa(id), nil)
	r.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
	}
}

func TestDeleteFolder_NonEmpty(t *testing.T) {
	h, db := setupFolderHandler()
	r := setupFolderRouter(h)

	parentID := createTestFolder(h, r)

	child := &model.Folder{
		Name:     "child-folder",
		ParentID: &parentID,
		Path:     "/test-folder/child-folder/",
	}
	db.Create(child)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/files/folders/"+itoa(parentID), nil)
	r.ServeHTTP(w, req)

	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d: %s", w.Code, w.Body.String())
	}
}