package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"testing"

	"gcy_hpc_server/internal/testutil/testenv"
)

// folderData mirrors the FolderResponse DTO returned by the API.
type folderData struct {
	ID             int64  `json:"id"`
	Name           string `json:"name"`
	ParentID       *int64 `json:"parent_id,omitempty"`
	Path           string `json:"path"`
	FileCount      int64  `json:"file_count"`
	SubFolderCount int64  `json:"subfolder_count"`
}

// folderMessageData mirrors the delete endpoint response data structure.
type folderMessageData struct {
	Message string `json:"message"`
}

// folderDoRequest marshals body and calls env.DoRequest.
func folderDoRequest(env *testenv.TestEnv, method, path string, body interface{}) *http.Response {
	var r io.Reader
	if body != nil {
		b, err := json.Marshal(body)
		if err != nil {
			panic(fmt.Sprintf("folderDoRequest marshal: %v", err))
		}
		r = bytes.NewReader(b)
	}
	return env.DoRequest(method, path, r)
}

// folderDecodeAll decodes the response and returns status, success, and raw data.
func folderDecodeAll(env *testenv.TestEnv, resp *http.Response) (statusCode int, success bool, data json.RawMessage, err error) {
	statusCode = resp.StatusCode
	success, data, err = env.DecodeResponse(resp)
	return
}

// folderSeed creates a folder via HTTP and returns its ID.
func folderSeed(env *testenv.TestEnv, name string) int64 {
	body := map[string]interface{}{"name": name}
	resp := folderDoRequest(env, http.MethodPost, "/api/v1/files/folders", body)
	status, success, data, err := folderDecodeAll(env, resp)
	if err != nil {
		panic(fmt.Sprintf("folderSeed decode: %v", err))
	}
	if status != http.StatusCreated {
		panic(fmt.Sprintf("folderSeed: expected 201, got %d", status))
	}
	if !success {
		panic("folderSeed: expected success=true")
	}
	var f folderData
	if err := json.Unmarshal(data, &f); err != nil {
		panic(fmt.Sprintf("folderSeed unmarshal: %v", err))
	}
	return f.ID
}

// TestIntegration_Folder_Create verifies POST /api/v1/files/folders creates a folder.
func TestIntegration_Folder_Create(t *testing.T) {
	env := testenv.NewTestEnv(t)

	body := map[string]interface{}{"name": "test-folder-create"}
	resp := folderDoRequest(env, http.MethodPost, "/api/v1/files/folders", body)
	status, success, data, err := folderDecodeAll(env, resp)
	if err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if status != http.StatusCreated {
		t.Fatalf("expected status 201, got %d", status)
	}
	if !success {
		t.Fatal("expected success=true")
	}

	var created folderData
	if err := json.Unmarshal(data, &created); err != nil {
		t.Fatalf("unmarshal created data: %v", err)
	}
	if created.ID <= 0 {
		t.Fatalf("expected positive id, got %d", created.ID)
	}
	if created.Name != "test-folder-create" {
		t.Fatalf("expected name=test-folder-create, got %s", created.Name)
	}
}

// TestIntegration_Folder_List verifies GET /api/v1/files/folders returns a list.
func TestIntegration_Folder_List(t *testing.T) {
	env := testenv.NewTestEnv(t)

	// Seed two folders.
	folderSeed(env, "list-folder-1")
	folderSeed(env, "list-folder-2")

	resp := env.DoRequest(http.MethodGet, "/api/v1/files/folders", nil)
	status, success, data, err := folderDecodeAll(env, resp)
	if err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if status != http.StatusOK {
		t.Fatalf("expected status 200, got %d", status)
	}
	if !success {
		t.Fatal("expected success=true")
	}

	var folders []folderData
	if err := json.Unmarshal(data, &folders); err != nil {
		t.Fatalf("unmarshal list data: %v", err)
	}
	if len(folders) < 2 {
		t.Fatalf("expected at least 2 folders, got %d", len(folders))
	}
}

// TestIntegration_Folder_Get verifies GET /api/v1/files/folders/:id returns folder details.
func TestIntegration_Folder_Get(t *testing.T) {
	env := testenv.NewTestEnv(t)
	id := folderSeed(env, "test-folder-get")

	path := fmt.Sprintf("/api/v1/files/folders/%d", id)
	resp := env.DoRequest(http.MethodGet, path, nil)
	status, success, data, err := folderDecodeAll(env, resp)
	if err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if status != http.StatusOK {
		t.Fatalf("expected status 200, got %d", status)
	}
	if !success {
		t.Fatal("expected success=true")
	}

	var f folderData
	if err := json.Unmarshal(data, &f); err != nil {
		t.Fatalf("unmarshal folder data: %v", err)
	}
	if f.ID != id {
		t.Fatalf("expected id=%d, got %d", id, f.ID)
	}
	if f.Name != "test-folder-get" {
		t.Fatalf("expected name=test-folder-get, got %s", f.Name)
	}
}

// TestIntegration_Folder_Delete verifies DELETE /api/v1/files/folders/:id removes a folder.
func TestIntegration_Folder_Delete(t *testing.T) {
	env := testenv.NewTestEnv(t)
	id := folderSeed(env, "test-folder-delete")

	path := fmt.Sprintf("/api/v1/files/folders/%d", id)
	resp := env.DoRequest(http.MethodDelete, path, nil)
	status, success, data, err := folderDecodeAll(env, resp)
	if err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if status != http.StatusOK {
		t.Fatalf("expected status 200, got %d", status)
	}
	if !success {
		t.Fatal("expected success=true")
	}

	var msg folderMessageData
	if err := json.Unmarshal(data, &msg); err != nil {
		t.Fatalf("unmarshal message data: %v", err)
	}
	if msg.Message != "folder deleted" {
		t.Fatalf("expected message 'folder deleted', got %q", msg.Message)
	}

	// Verify it's gone via GET → 404.
	getResp := env.DoRequest(http.MethodGet, path, nil)
	getStatus, getSuccess, _, _ := folderDecodeAll(env, getResp)
	if getStatus != http.StatusNotFound {
		t.Fatalf("expected status 404 after delete, got %d", getStatus)
	}
	if getSuccess {
		t.Fatal("expected success=false after delete")
	}
}