"""文件与GUI文件管理相关路由。"""
from __future__ import annotations
import os
import zipfile
from io import BytesIO
from pathlib import Path
from typing import Dict, Any

from flask import Blueprint, jsonify, request, send_file
from werkzeug.utils import secure_filename

from modules.upload_security import UploadSecurityError
from .auth_helpers import api_login_required, resolve_admin_policy, get_current_user_record
from .security import rate_limited
from .context import with_terminal, get_gui_manager, get_upload_guard, build_upload_error_response
from .utils_common import debug_log

files_bp = Blueprint("files", __name__)


def sanitize_filename_preserve_unicode(filename: str) -> str:
    """在保留中文等字符的同时，移除危险字符和路径成分"""
    import re
    if not filename:
        return ""
    cleaned = filename.strip().replace("\x00", "")
    if not cleaned:
        return ""
    cleaned = cleaned.replace("\\", "/").split("/")[-1]
    cleaned = re.sub(r'[<>:"\\|?*\n\r\t]', "_", cleaned)
    cleaned = cleaned.strip(". ")
    if not cleaned:
        return ""
    return cleaned[:255]

@files_bp.route('/api/files')
@api_login_required
@with_terminal
def get_files(terminal, workspace, username):
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("collapse_workspace") or policy.get("ui_blocks", {}).get("block_file_manager"):
        return jsonify({"success": False, "error": "文件浏览已被管理员禁用"}), 403
    structure = terminal.context_manager.get_project_structure()
    return jsonify(structure)


def _format_entry(entry) -> Dict[str, Any]:
    return {
        "name": entry.name,
        "path": entry.path,
        "type": entry.type,
        "size": entry.size,
        "modified_at": entry.modified_at,
        "extension": entry.extension,
        "is_editable": entry.is_editable,
    }


@files_bp.route('/api/gui/files/entries', methods=['GET'])
@api_login_required
@with_terminal
def gui_list_entries(terminal, workspace, username):
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_file_manager"):
        return jsonify({"success": False, "error": "文件管理已被管理员禁用"}), 403
    relative_path = request.args.get('path') or ""
    manager = get_gui_manager(workspace)
    try:
        resolved_path, entries = manager.list_directory(relative_path)
        breadcrumb = manager.breadcrumb(resolved_path)
        return jsonify({
            "success": True,
            "data": {
                "path": resolved_path,
                "breadcrumb": breadcrumb,
                "items": [_format_entry(entry) for entry in entries]
            }
        })
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/create', methods=['POST'])
@api_login_required
@with_terminal
@rate_limited("gui_file_create", 30, 60, scope="user")
def gui_create_entry(terminal, workspace, username):
    payload = request.get_json() or {}
    parent = payload.get('path') or ""
    name = payload.get('name') or ""
    entry_type = payload.get('type') or "file"
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_file_manager"):
        return jsonify({"success": False, "error": "文件管理已被管理员禁用"}), 403
    manager = get_gui_manager(workspace)
    try:
        new_path = manager.create_entry(parent, name, entry_type)
        return jsonify({"success": True, "path": new_path})
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/delete', methods=['POST'])
@api_login_required
@with_terminal
@rate_limited("gui_file_delete", 30, 60, scope="user")
def gui_delete_entries(terminal, workspace, username):
    payload = request.get_json() or {}
    paths = payload.get('paths') or []
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_file_manager"):
        return jsonify({"success": False, "error": "文件管理已被管理员禁用"}), 403
    manager = get_gui_manager(workspace)
    try:
        result = manager.delete_entries(paths)
        return jsonify({"success": True, "result": result})
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/rename', methods=['POST'])
@api_login_required
@with_terminal
@rate_limited("gui_file_rename", 30, 60, scope="user")
def gui_rename_entry(terminal, workspace, username):
    payload = request.get_json() or {}
    path = payload.get('path')
    new_name = payload.get('new_name')
    if not path or not new_name:
        return jsonify({"success": False, "error": "缺少 path 或 new_name"}), 400
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_file_manager"):
        return jsonify({"success": False, "error": "文件管理已被管理员禁用"}), 403
    manager = get_gui_manager(workspace)
    try:
        new_path = manager.rename_entry(path, new_name)
        return jsonify({"success": True, "path": new_path})
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/copy', methods=['POST'])
@api_login_required
@with_terminal
@rate_limited("gui_file_copy", 40, 120, scope="user")
def gui_copy_entries(terminal, workspace, username):
    payload = request.get_json() or {}
    paths = payload.get('paths') or []
    target_dir = payload.get('target_dir') or ""
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_file_manager"):
        return jsonify({"success": False, "error": "文件管理已被管理员禁用"}), 403
    manager = get_gui_manager(workspace)
    try:
        result = manager.copy_entries(paths, target_dir)
        return jsonify({"success": True, "result": result})
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/move', methods=['POST'])
@api_login_required
@with_terminal
@rate_limited("gui_file_move", 40, 120, scope="user")
def gui_move_entries(terminal, workspace, username):
    payload = request.get_json() or {}
    paths = payload.get('paths') or []
    target_dir = payload.get('target_dir') or ""
    manager = get_gui_manager(workspace)
    try:
        result = manager.move_entries(paths, target_dir)
        return jsonify({"success": True, "result": result})
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/upload', methods=['POST'])
@api_login_required
@with_terminal
@rate_limited("gui_file_upload", 10, 300, scope="user")
def gui_upload_entry(terminal, workspace, username):
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_upload"):
        return jsonify({"success": False, "error": "文件上传已被管理员禁用"}), 403
    if 'file' not in request.files:
        return jsonify({"success": False, "error": "未找到文件"}), 400
    file_obj = request.files['file']
    if not file_obj or not file_obj.filename:
        return jsonify({"success": False, "error": "文件名为空"}), 400
    current_dir = request.form.get('path') or ""
    raw_name = request.form.get('filename') or file_obj.filename
    filename = sanitize_filename_preserve_unicode(raw_name) or secure_filename(raw_name)
    if not filename:
        return jsonify({"success": False, "error": "非法文件名"}), 400
    manager = get_gui_manager(workspace)
    try:
        target_path = manager.prepare_upload(current_dir, filename)
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400
    try:
        relative_path = manager._to_relative(target_path)
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400
    guard = get_upload_guard(workspace)
    try:
        result = guard.process_upload(
            file_obj,
            target_path,
            username=username,
            source="web_gui",
            original_name=raw_name,
            relative_path=relative_path,
        )
    except UploadSecurityError as exc:
        return build_upload_error_response(exc)
    except Exception as exc:
        return jsonify({"success": False, "error": f"保存文件失败: {exc}"}), 500

    metadata = result.get("metadata", {})
    return jsonify({
        "success": True,
        "path": relative_path,
        "filename": target_path.name,
        "scan": metadata.get("scan"),
        "sha256": metadata.get("sha256"),
        "size": metadata.get("size"),
    })


@files_bp.route('/api/gui/files/download', methods=['GET'])
@api_login_required
@with_terminal
def gui_download_entry(terminal, workspace, username):
    path = request.args.get('path')
    if not path:
        return jsonify({"success": False, "error": "缺少 path"}), 400
    manager = get_gui_manager(workspace)
    try:
        target = manager.prepare_download(path)
        if target.is_dir():
            memory_file = BytesIO()
            with zipfile.ZipFile(memory_file, mode='w', compression=zipfile.ZIP_DEFLATED) as zf:
                for root, dirs, files in os.walk(target):
                    for file in files:
                        full_path = Path(root) / file
                        arcname = manager._to_relative(full_path)
                        zf.write(full_path, arcname=arcname)
            memory_file.seek(0)
            download_name = f"{target.name}.zip"
            return send_file(memory_file, as_attachment=True, download_name=download_name, mimetype='application/zip')
        return send_file(target, as_attachment=True, download_name=target.name)
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/download/batch', methods=['POST'])
@api_login_required
@with_terminal
def gui_download_batch(terminal, workspace, username):
    payload = request.get_json() or {}
    paths = payload.get('paths') or []
    if not paths:
        return jsonify({"success": False, "error": "缺少待下载的路径"}), 400
    manager = get_gui_manager(workspace)
    try:
        memory_file = BytesIO()
        with zipfile.ZipFile(memory_file, mode='w', compression=zipfile.ZIP_DEFLATED) as zf:
            for rel in paths:
                target = manager.prepare_download(rel)
                arc_base = rel.strip('/') or target.name
                if target.is_dir():
                    for root, _, files in os.walk(target):
                        for file in files:
                            full_path = Path(root) / file
                            relative_sub = full_path.relative_to(target)
                            arcname = Path(arc_base) / relative_sub
                            zf.write(full_path, arcname=str(arcname))
                else:
                    zf.write(target, arcname=arc_base)
        memory_file.seek(0)
        download_name = f"selected_{len(paths)}.zip"
        return send_file(memory_file, as_attachment=True, download_name=download_name, mimetype='application/zip')
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


@files_bp.route('/api/gui/files/text', methods=['GET', 'POST'])
@api_login_required
@with_terminal
def gui_text_entry(terminal, workspace, username):
    manager = get_gui_manager(workspace)
    if request.method == 'GET':
        path = request.args.get('path')
        if not path:
            return jsonify({"success": False, "error": "缺少 path"}), 400
        try:
            content, modified = manager.read_text(path)
            return jsonify({"success": True, "path": path, "content": content, "modified_at": modified})
        except Exception as exc:
            return jsonify({"success": False, "error": str(exc)}), 400

    payload = request.get_json() or {}
    path = payload.get('path')
    content = payload.get('content')
    if path is None or content is None:
        return jsonify({"success": False, "error": "缺少 path 或 content"}), 400
    try:
        result = manager.write_text(path, content)
        return jsonify({"success": True, "data": result})
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 400


__all__ = ["files_bp"]