"""Web 管理面板路由。"""
from flask import Blueprint, render_template, request, redirect, url_for, flash, current_app
from auth import login_required, permission_required
from database import db
from models import Instance, User
from services import stats_service, backup_service

bp = Blueprint("web", __name__)


# ── 通用模板上下文 ─────────────────────────────────────────────
@bp.app_context_processor
def inject_nav():
    from flask import session as flask_session
    p = request.path
    if p == "/" or p.startswith("/dashboard"):
        page_name = "仪表盘"
    elif p.startswith("/instances"):
        page_name = "代理实例"
    elif p.startswith("/users"):
        page_name = "用户管理"
    elif p == "/stats":
        page_name = "流量统计"
    elif p.startswith("/stats/connections"):
        page_name = "活跃连接"
    elif p.startswith("/logs"):
        page_name = "审计日志"
    elif p.startswith("/system/admins"):
        page_name = "管理员账户"
    elif p.startswith("/system"):
        page_name = "系统管理"
    else:
        page_name = ""
    return {
        "nav": {
            "dashboard": p == "/" or p.startswith("/dashboard"),
            "instances": p.startswith("/instances"),
            "users": p.startswith("/users"),
            "stats": p.startswith("/stats"),
            "logs": p.startswith("/logs"),
            "system": p.startswith("/system") and not p.startswith("/system/admins"),
            "admins": p.startswith("/system/admins"),
        },
        "page_name": page_name,
        "logged_in": flask_session.get("logged_in", False),
    }


# ── 仪表盘 ─────────────────────────────────────────────────────
@bp.route("/")
@bp.route("/dashboard")
@login_required
def index():
    summary = stats_service.get_dashboard_summary()
    return render_template("dashboard.html", s=summary)


# ── 实例管理 ───────────────────────────────────────────────────
@bp.route("/instances")
@login_required
def instances():
    inst_list = current_app.instance_manager.get_status()
    return render_template("instances.html", instances=inst_list)


@bp.route("/instances/<int:iid>/start", methods=["POST"])
@login_required
def start_instance(iid):
    try:
        current_app.instance_manager.start_instance(iid)
        flash("实例已启动", "success")
    except OSError as e:
        flash(f"启动失败（端口可能被占用）: {e}", "danger")
    return redirect(url_for("web.instances"))


@bp.route("/instances/<int:iid>/stop", methods=["POST"])
@login_required
def stop_instance(iid):
    current_app.instance_manager.stop_instance(iid)
    flash("实例已停止", "warning")
    return redirect(url_for("web.instances"))


@bp.route("/instances/<int:iid>/restart", methods=["POST"])
@login_required
def restart_instance(iid):
    try:
        current_app.instance_manager.restart_instance(iid)
        flash("实例已重启", "info")
    except OSError as e:
        flash(f"重启失败（端口可能被占用）: {e}", "danger")
    return redirect(url_for("web.instances"))


@bp.route("/instances/add", methods=["POST"])
@login_required
def add_instance():
    name = request.form.get("name", "").strip()
    if not name:
        flash("名称不能为空", "danger")
        return redirect(url_for("web.instances"))
    if db.session.query(Instance).filter_by(name=name).first():
        flash("名称已存在", "danger")
        return redirect(url_for("web.instances"))

    inst = Instance(
        name=name,
        listen_host=request.form.get("listen_host", "0.0.0.0"),
        listen_port=int(request.form.get("listen_port", 1080)),
        timeout=int(request.form.get("timeout", 30)),
        auth_method=request.form.get("auth_method", "none"),
        bandwidth_down=float(request.form.get("bandwidth_down", 0)),
        bandwidth_up=float(request.form.get("bandwidth_up", 0)),
        max_concurrent=int(request.form.get("max_concurrent", 10)),
        notes=request.form.get("notes", ""),
    )
    db.session.add(inst)
    db.session.commit()

    if request.form.get("start") == "on":
        current_app.instance_manager.start_instance(inst.id)

    flash(f"实例 {name} 已创建", "success")
    return redirect(url_for("web.instances"))


@bp.route("/instances/<int:iid>/edit", methods=["POST"])
@login_required
def edit_instance(iid):
    inst = db.session.query(Instance).get(iid)
    if not inst:
        return "实例不存在", 404
    data = request.form
    inst.listen_host = data.get("listen_host", inst.listen_host)
    inst.listen_port = int(data.get("listen_port", inst.listen_port))
    inst.timeout = int(data.get("timeout", inst.timeout))
    inst.auth_method = data.get("auth_method", inst.auth_method)
    inst.bandwidth_down = float(data.get("bandwidth_down", inst.bandwidth_down))
    inst.bandwidth_up = float(data.get("bandwidth_up", inst.bandwidth_up))
    inst.max_concurrent = int(data.get("max_concurrent", inst.max_concurrent))
    inst.notes = data.get("notes", inst.notes)
    db.session.commit()

    if inst.running:
        try:
            current_app.instance_manager.restart_instance(iid)
        except OSError as e:
            flash(f"重启失败（端口可能被占用）: {e}", "warning")

    flash("配置已更新", "success")
    return redirect(url_for("web.instances"))


@bp.route("/instances/<int:iid>/delete", methods=["POST"])
@login_required
def delete_instance(iid):
    inst = db.session.query(Instance).get(iid)
    if not inst:
        return "实例不存在", 404
    current_app.instance_manager.stop_instance(iid)
    db.session.delete(inst)
    db.session.commit()
    flash("实例已删除", "warning")
    return redirect(url_for("web.instances"))


# ── 用户管理 ───────────────────────────────────────────────────
@bp.route("/users")
@login_required
def users():
    page = int(request.args.get("page", 1))
    search = request.args.get("search", "")
    data = current_app.user_service.list_users(page=page, search=search)
    return render_template("users.html", **data, search=search)


@bp.route("/users/add", methods=["POST"])
@login_required
def add_user():
    data = request.form
    result = current_app.user_service.create_user(
        username=data.get("username", "").strip(),
        password=data.get("password", ""),
        bandwidth_down=float(data.get("bandwidth_down", 0)),
        bandwidth_up=float(data.get("bandwidth_up", 0)),
        max_concurrent=int(data.get("max_concurrent", 10)),
        total_traffic_mb=float(data.get("total_traffic_mb", 0)),
        monthly_traffic_mb=float(data.get("monthly_traffic_mb", 0)),
        ip_whitelist=data.get("ip_whitelist", ""),
        ip_blacklist=data.get("ip_blacklist", ""),
        expire_at=data.get("expire_at"),
    )
    if "error" in result:
        flash(result["error"], "danger")
    else:
        flash("用户已创建", "success")
    return redirect(url_for("web.users"))


@bp.route("/users/<int:uid>/edit", methods=["POST"])
@login_required
def edit_user(uid):
    data = request.form
    kwargs = {
        "password": data.get("password", ""),
        "bandwidth_down": float(data.get("bandwidth_down", 0)),
        "bandwidth_up": float(data.get("bandwidth_up", 0)),
        "max_concurrent": int(data.get("max_concurrent", 10)),
        "total_traffic_mb": float(data.get("total_traffic_mb", 0)),
        "monthly_traffic_mb": float(data.get("monthly_traffic_mb", 0)),
        "ip_whitelist": data.get("ip_whitelist", ""),
        "ip_blacklist": data.get("ip_blacklist", ""),
        "expire_at": data.get("expire_at"),
    }
    result = current_app.user_service.update_user(uid, **kwargs)
    if "error" in result:
        flash(result["error"], "danger")
    else:
        flash("用户已更新", "success")
    return redirect(url_for("web.users"))


@bp.route("/users/<int:uid>/delete", methods=["POST"])
@login_required
def delete_user(uid):
    result = current_app.user_service.delete_user(uid)
    if "error" in result:
        flash(result["error"], "danger")
    else:
        flash("用户已删除", "warning")
    return redirect(url_for("web.users"))


@bp.route("/users/<int:uid>/toggle", methods=["POST"])
@login_required
def toggle_user(uid):
    # 支持两种调用方式:
    # 1) 隐藏字段 enabled=on/off (web form)
    # 2) 不带字段时切换当前状态 (传统行为, 防止表单无字段导致总是禁用)
    if "enabled" in request.form:
        enabled = request.form.get("enabled") in ("on", "true", "1", "yes")
    else:
        from models import User
        from database import db
        u = db.session.query(User).get(uid)
        if not u:
            flash("用户不存在", "danger")
            return redirect(url_for("web.users"))
        enabled = not u.enabled
    result = current_app.user_service.toggle_user(uid, enabled)
    flash("已" + ("启用" if enabled else "禁用") + "该用户", "success")
    return redirect(url_for("web.users"))


@bp.route("/users/<int:uid>/ban", methods=["POST"])
@login_required
def ban_user(uid):
    # 同 toggle_user 的两种调用方式
    if "ban" in request.form:
        banned = request.form.get("ban") in ("on", "true", "1", "yes")
    else:
        from models import User
        from database import db
        u = db.session.query(User).get(uid)
        if not u:
            flash("用户不存在", "danger")
            return redirect(url_for("web.users"))
        banned = not u.banned
    result = current_app.user_service.ban_user(uid, banned)
    flash("已" + ("封禁" if banned else "解封") + "该用户", "success")
    return redirect(url_for("web.users"))


# ── 统计 ───────────────────────────────────────────────────────
@bp.route("/stats")
@login_required
def stats():
    return render_template("stats.html",
                           trend=stats_service.get_traffic_trend(30),
                           users=stats_service.get_user_stats(),
                           instances=stats_service.get_instance_stats())


# ── 活跃连接 ───────────────────────────────────────────────────
@bp.route("/stats/connections")
@login_required
def connections():
    return render_template("connections.html",
                           conns=stats_service.get_active_connections())


# ── 审计日志 ───────────────────────────────────────────────────
@bp.route("/logs")
@login_required
def logs():
    page = int(request.args.get("page", 1))
    data = current_app.user_service.query_logs(
        page=page,
        event=request.args.get("event", ""),
        user=request.args.get("user", ""),
        src_ip=request.args.get("src_ip", ""),
    )
    return render_template("logs.html", **data,
                           event_filter=request.args.get("event", ""),
                           user_filter=request.args.get("user", ""),
                           ip_filter=request.args.get("src_ip", ""))


# ── 系统管理 ───────────────────────────────────────────────────
@bp.route("/system")
@login_required
@permission_required("system:read")
def system():
    import platform, time
    from auth import current_admin
    backups = backup_service.list_backups()
    admin = current_admin()
    return render_template("system.html", backups=backups,
                           sys_version=platform.python_version(),
                           sys_platform=platform.platform(),
                           sys_hostname=platform.node(),
                           uptime=time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
                           current_admin=admin)


@bp.route("/system/backup", methods=["POST"])
@login_required
@permission_required("system:write")
def create_backup():
    backup_service.create_backup()
    flash("备份已完成", "success")
    return redirect(url_for("web.system"))


@bp.route("/system/restore/<int:bid>", methods=["POST"])
@login_required
@permission_required("system:write")
def restore_backup(bid):
    result = backup_service.restore_backup(bid)
    if "error" in result:
        flash(result["error"], "danger")
    else:
        flash("恢复完成，请刷新页面", "success")
    return redirect(url_for("web.system"))


# ── 管理员账户管理 ────────────────────────────────────────────────
@bp.route("/system/admins")
@login_required
@permission_required("admins:read")
def admins():
    from models import AdminUser
    from auth import current_admin
    admin_list = AdminUser.query.order_by(AdminUser.id.asc()).all()
    return render_template("admins.html", admins=admin_list,
                           current_admin=current_admin())


@bp.route("/system/admins/add", methods=["POST"])
@login_required
@permission_required("admins:write")
def add_admin():
    from models import AdminUser
    username = request.form.get("username", "").strip()
    password = request.form.get("password", "")
    role = request.form.get("role", "viewer")
    if not username or not password:
        flash("用户名和密码不能为空", "danger")
        return redirect(url_for("web.admins"))
    if role not in AdminUser.ROLE_LABELS:
        role = "viewer"
    if AdminUser.query.filter_by(username=username).first():
        flash("用户名已存在", "danger")
        return redirect(url_for("web.admins"))
    if len(password) < 4:
        flash("密码至少 4 位", "danger")
        return redirect(url_for("web.admins"))
    admin = AdminUser()
    admin.username = username
    admin.role = role
    admin.enabled = True
    admin.set_password(password)
    db.session.add(admin)
    db.session.commit()
    flash(f"已创建管理员 {username}", "success")
    return redirect(url_for("web.admins"))


@bp.route("/system/admins/<int:aid>/toggle", methods=["POST"])
@login_required
@permission_required("admins:write")
def toggle_admin(aid):
    from models import AdminUser
    from auth import current_admin
    admin = AdminUser.query.get_or_404(aid)
    # 不能禁用自己
    curr = current_admin()
    if curr and curr.id == admin.id:
        flash("不能禁用当前登录账户", "danger")
        return redirect(url_for("web.admins"))
    admin.enabled = not admin.enabled
    db.session.commit()
    flash(f"{'已启用' if admin.enabled else '已禁用'} {admin.username}", "info")
    return redirect(url_for("web.admins"))


@bp.route("/system/admins/<int:aid>/role", methods=["POST"])
@login_required
@permission_required("admins:write")
def change_admin_role(aid):
    from models import AdminUser
    admin = AdminUser.query.get_or_404(aid)
    role = request.form.get("role", "viewer")
    if role not in AdminUser.ROLE_LABELS:
        flash("无效的角色", "danger")
        return redirect(url_for("web.admins"))
    admin.role = role
    db.session.commit()
    flash(f"{admin.username} 角色已更新为 {admin.role_label}", "success")
    return redirect(url_for("web.admins"))


@bp.route("/system/admins/<int:aid>/password", methods=["POST"])
@login_required
@permission_required("admins:write")
def reset_admin_password(aid):
    from models import AdminUser
    password = request.form.get("password", "")
    if not password or len(password) < 4:
        flash("密码至少 4 位", "danger")
        return redirect(url_for("web.admins"))
    admin = AdminUser.query.get_or_404(aid)
    admin.set_password(password)
    db.session.commit()
    flash(f"{admin.username} 密码已重置", "success")
    return redirect(url_for("web.admins"))


@bp.route("/system/admins/<int:aid>/delete", methods=["POST"])
@login_required
@permission_required("admins:write")
def delete_admin(aid):
    from models import AdminUser
    from auth import current_admin
    admin = AdminUser.query.get_or_404(aid)
    curr = current_admin()
    if curr and curr.id == admin.id:
        flash("不能删除当前登录账户", "danger")
        return redirect(url_for("web.admins"))
    # 至少保留一个 superadmin
    if admin.role == "superadmin":
        super_count = AdminUser.query.filter_by(role="superadmin", enabled=True).count()
        if super_count <= 1:
            flash("至少需要保留一个启用的超级管理员", "danger")
            return redirect(url_for("web.admins"))
    db.session.delete(admin)
    db.session.commit()
    flash(f"已删除管理员 {admin.username}", "warning")
    return redirect(url_for("web.admins"))


@bp.route("/system/change-password", methods=["POST"])
@login_required
def change_my_password():
    """当前登录用户修改自己的密码。"""
    from models import AdminUser
    from auth import current_admin
    old_pwd = request.form.get("old_password", "")
    new_pwd = request.form.get("new_password", "")
    confirm_pwd = request.form.get("confirm_password", "")
    admin = current_admin()
    if not admin:
        return redirect(url_for("auth.logout"))
    if not admin.check_password(old_pwd):
        flash("原密码错误", "danger")
        return redirect(url_for("web.system"))
    if not new_pwd or len(new_pwd) < 4:
        flash("新密码至少 4 位", "danger")
        return redirect(url_for("web.system"))
    if new_pwd != confirm_pwd:
        flash("两次输入的新密码不一致", "danger")
        return redirect(url_for("web.system"))
    admin.set_password(new_pwd)
    db.session.commit()
    flash("密码修改成功", "success")
    return redirect(url_for("web.system"))