"""设备事件日志 API"""

import csv
import io

from flask import Blueprint, jsonify, render_template, request, Response
from flask_login import login_required, current_user
from app.models import get_device_logs, export_device_logs, delete_device_logs, insert_log

bp = Blueprint("device_logs", __name__)


@bp.route("/device-logs")
@login_required
def index():
    """设备日志页面"""
    return render_template("device_logs.html")


@bp.route("/api/device-logs")
@login_required
def api_device_logs():
    """查询设备事件日志"""
    page = request.args.get("page", 1, type=int)
    per_page = request.args.get("per_page", 30, type=int)
    serial = request.args.get("serial", "", type=str)
    event_type = request.args.get("event_type", "", type=str)
    date_from = request.args.get("date_from", "", type=str)
    date_to = request.args.get("date_to", "", type=str)

    records, total = get_device_logs(
        page=page, per_page=per_page,
        serial=serial, event_type=event_type,
        date_from=date_from, date_to=date_to,
    )
    pages = max(1, (total + per_page - 1) // per_page)
    return jsonify({"records": records, "total": total, "pages": pages})


@bp.route("/api/device-logs/export")
@login_required
def api_export():
    """导出设备事件日志为 CSV"""
    serial = request.args.get("serial", "", type=str)
    event_type = request.args.get("event_type", "", type=str)
    date_from = request.args.get("date_from", "", type=str)
    date_to = request.args.get("date_to", "", type=str)

    records = export_device_logs(
        serial=serial, event_type=event_type,
        date_from=date_from, date_to=date_to,
    )

    output = io.StringIO()
    writer = csv.writer(output)

    if records:
        headers = list(records[0].keys())
        writer.writerow(headers)
        for r in records:
            writer.writerow(r.values())

    output.seek(0)
    return Response(
        output.getvalue(),
        mimetype="text/csv",
        headers={"Content-Disposition": "attachment; filename=device_logs.csv"},
    )


@bp.route("/api/device-logs/delete", methods=["POST"])
@login_required
def api_device_logs_delete():
    """删除设备日志（admin 权限）"""
    if current_user.role != "admin":
        return jsonify({"ok": False, "error": "无权限"}), 403

    data = request.get_json()
    serial = data.get("serial", "")
    event_type = data.get("event_type", "")
    date_from = data.get("date_from", "")
    date_to = data.get("date_to", "")

    deleted = delete_device_logs(
        serial=serial, event_type=event_type,
        date_from=date_from, date_to=date_to,
    )
    insert_log(
        current_user.id, current_user.username, "delete",
        target="device_log",
        detail=f"删除 {deleted} 条设备日志 serial={serial} type={event_type}",
        result="ok",
        ip=request.remote_addr or "",
    )
    return jsonify({"ok": True, "deleted": deleted})