from __future__ import annotations
import mimetypes
from pathlib import Path
from flask import Blueprint, request, jsonify, session, redirect, send_from_directory, abort, current_app

from modules.personalization_manager import load_personalization_config
from modules.user_manager import UserWorkspace

from .auth_helpers import login_required, api_login_required, get_current_user_record, get_current_username
from .security import (
    get_csrf_token,
    check_rate_limit,
    register_failure,
    is_action_blocked,
    clear_failures,
)
from .context import with_terminal, get_gui_manager
from . import state
from .utils_common import debug_log

auth_bp = Blueprint("auth", __name__)


@auth_bp.route('/api/csrf-token', methods=['GET'])
def issue_csrf_token():
    token = get_csrf_token()
    response = jsonify({"success": True, "token": token})
    response.headers['Cache-Control'] = 'no-store'
    return response


@auth_bp.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        if session.get('username'):
            return redirect('/new')
        if not state.container_manager.has_capacity():
            return current_app.send_static_file('resource_busy.html'), 503
        return current_app.send_static_file('login.html')

    data = request.get_json() or {}
    email = (data.get('email') or '').strip()
    password = data.get('password') or ''
    client_ip = request.headers.get('X-Forwarded-For', '').split(',')[0].strip() or request.remote_addr or 'unknown'

    limited, retry_after = check_rate_limit("login", 10, 60, client_ip)
    if limited:
        return jsonify({"success": False, "error": "登录请求过于频繁，请稍后再试。", "retry_after": retry_after}), 429

    blocked, block_for = is_action_blocked("login", identifier=client_ip)
    if blocked:
        return jsonify({"success": False, "error": f"尝试次数过多，请 {block_for} 秒后重试。", "retry_after": block_for}), 429

    record = state.user_manager.authenticate(email, password)
    if not record:
        wait_seconds = register_failure("login", state.FAILED_LOGIN_LIMIT, state.FAILED_LOGIN_LOCK_SECONDS, identifier=client_ip)
        error_payload = {"success": False, "error": "账号或密码错误"}
        status_code = 401
        if wait_seconds:
            error_payload.update({"error": f"尝试次数过多，请 {wait_seconds} 秒后重试。", "retry_after": wait_seconds})
            status_code = 429
        return jsonify(error_payload), status_code

    workspace = state.user_manager.ensure_user_workspace(record.username)
    preferred_run_mode = None
    try:
        personal_config = load_personalization_config(workspace.data_dir)
        candidate_mode = (personal_config or {}).get('default_run_mode')
        if isinstance(candidate_mode, str):
            normalized_mode = candidate_mode.lower()
            if normalized_mode in {"fast", "thinking", "deep"}:
                preferred_run_mode = normalized_mode
    except Exception as exc:
        debug_log(f"加载个性化偏好失败: {exc}")

    session['logged_in'] = True
    session['username'] = record.username
    session['role'] = record.role or 'user'
    default_thinking = current_app.config.get('DEFAULT_THINKING_MODE', False)
    session['thinking_mode'] = default_thinking
    session['run_mode'] = current_app.config.get('DEFAULT_RUN_MODE', "deep" if default_thinking else "fast")
    if preferred_run_mode:
        session['run_mode'] = preferred_run_mode
        session['thinking_mode'] = preferred_run_mode != 'fast'
    session.permanent = True
    clear_failures("login", identifier=client_ip)
    try:
        state.container_manager.ensure_container(record.username, str(workspace.project_path))
    except RuntimeError as exc:
        session.clear()
        return jsonify({"success": False, "error": str(exc), "code": "resource_busy"}), 503
    from .usage import record_user_activity
    record_user_activity(record.username)
    get_csrf_token(force_new=True)
    return jsonify({"success": True})


@auth_bp.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'GET':
        if session.get('username'):
            return redirect('/new')
        return current_app.send_static_file('register.html')

    data = request.get_json() or {}
    username = (data.get('username') or '').strip()
    email = (data.get('email') or '').strip()
    password = data.get('password') or ''
    invite_code = (data.get('invite_code') or '').strip()

    from .security import get_client_ip
    limited, retry_after = check_rate_limit("register", 5, 300, get_client_ip())
    if limited:
        return jsonify({"success": False, "error": "注册请求过于频繁，请稍后再试。", "retry_after": retry_after}), 429
    try:
        state.user_manager.register_user(username, email, password, invite_code)
        return jsonify({"success": True})
    except ValueError as exc:
        return jsonify({"success": False, "error": str(exc)}), 400
    except Exception as exc:
        return jsonify({"success": False, "error": str(exc)}), 500


@auth_bp.route('/logout', methods=['POST'])
def logout():
    username = session.get('username')
    session.clear()
    if username and username in state.user_terminals:
        state.user_terminals.pop(username, None)
    if username:
        state.container_manager.release_container(username, reason="logout")
        for token_value, meta in list(state.pending_socket_tokens.items()):
            if meta.get("username") == username:
                state.pending_socket_tokens.pop(token_value, None)
    return jsonify({"success": True})


@auth_bp.route('/')
@login_required
def index():
    return redirect('/new')


@auth_bp.route('/new')
@login_required
def new_page():
    return current_app.send_static_file('index.html')


@auth_bp.route('/<conv:conversation_id>')
@login_required
def conversation_page(conversation_id):
    return current_app.send_static_file('index.html')


@auth_bp.route('/terminal')
@login_required
def terminal_page():
    from .auth_helpers import resolve_admin_policy
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_realtime_terminal"):
        return "实时终端已被管理员禁用", 403
    return current_app.send_static_file('terminal.html')


@auth_bp.route('/file-manager')
@login_required
def gui_file_manager_page():
    from .auth_helpers import resolve_admin_policy
    policy = resolve_admin_policy(get_current_user_record())
    if policy.get("ui_blocks", {}).get("block_file_manager"):
        return "文件管理器已被管理员禁用", 403
    return send_from_directory(Path(current_app.static_folder) / 'file_manager', 'index.html')


@auth_bp.route('/file-manager/editor')
@login_required
def gui_file_editor_page():
    return send_from_directory(Path(current_app.static_folder) / 'file_manager', 'editor.html')


@auth_bp.route('/file-preview/<path:relative_path>')
@login_required
@with_terminal
def gui_file_preview(relative_path: str, terminal, workspace: UserWorkspace, username: str):
    manager = get_gui_manager(workspace)
    try:
        target = manager.prepare_download(relative_path)
        if not target.is_file():
            return "预览仅支持文件", 400
        return send_from_directory(directory=target.parent, path=target.name, mimetype='text/html')
    except Exception as exc:
        return f"无法预览文件: {exc}", 400


@auth_bp.route('/user_upload/<path:filename>')
@login_required
def serve_user_upload(filename: str):
    user = get_current_user_record()
    if not user:
        return redirect('/login')
    workspace = state.user_manager.ensure_user_workspace(user.username)
    uploads_dir = workspace.uploads_dir.resolve()
    target = (uploads_dir / filename).resolve()
    try:
        target.relative_to(uploads_dir)
    except ValueError:
        abort(403)
    if not target.exists() or not target.is_file():
        abort(404)
    return send_from_directory(str(uploads_dir), str(target.relative_to(uploads_dir)))


@auth_bp.route('/workspace/<path:filename>')
@login_required
def serve_workspace_file(filename: str):
    user = get_current_user_record()
    if not user:
        return redirect('/login')
    workspace = state.user_manager.ensure_user_workspace(user.username)
    project_root = workspace.project_path.resolve()
    target = (project_root / filename).resolve()
    try:
        target.relative_to(project_root)
    except ValueError:
        abort(403)
    if not target.exists() or not target.is_file():
        abort(404)
    mime_type, _ = mimetypes.guess_type(str(target))
    if not mime_type or not mime_type.startswith("image/"):
        abort(415)
    return send_from_directory(str(target.parent), target.name)


@auth_bp.route('/static/<path:filename>')
def static_files(filename):
    if filename.startswith('admin_dashboard'):
        abort(404)
    return send_from_directory('static', filename)

__all__ = ["auth_bp"]