package com.iot.gateway.mcp;

import com.fasterxml.jackson.databind.JsonNode;
import com.iot.gateway.common.BackendInternalClient;
import com.iot.gateway.common.BizException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class McpToolRegistry {

    @Autowired
    private BackendInternalClient internalClient;

    /**
     * 演示/开发模式开关。生产环境下必须为 false，避免将后端故障误报为“成功”或演示响应
     */
    @Value("${gateway.mock.enabled:false}")
    private boolean mockEnabled;

    public List<Map<String, Object>> getToolDefinitions() {
        List<Map<String, Object>> tools = new ArrayList<>();

        // 1. iot_device_list
        Map<String, Object> t1 = new HashMap<>();
        t1.put("name", "iot_device_list");
        t1.put("description", "查询当前租户名下的所有工业物联网设备台账与实时运行状态（在线/报警/停机）。所需权限范围: device.read");
        Map<String, Object> s1 = new HashMap<>();
        s1.put("type", "object");
        Map<String, Object> p1 = new HashMap<>();
        p1.put("status", Map.of("type", "string", "description", "设备状态过滤: online/offline/alarm，默认全部"));
        p1.put("pageNum", Map.of("type", "integer", "description", "分页页码，默认 1"));
        p1.put("pageSize", Map.of("type", "integer", "description", "每页条数，默认 10"));
        s1.put("properties", p1);
        t1.put("inputSchema", s1);
        tools.add(t1);

        // 2. iot_telemetry_latest
        Map<String, Object> t2 = new HashMap<>();
        t2.put("name", "iot_telemetry_latest");
        t2.put("description", "召测指定工业设备的最新实时点位遥测数据（注塑机温度、注塑压力、螺杆转速、能耗电流等）。所需权限范围: telemetry.read");
        Map<String, Object> s2 = new HashMap<>();
        s2.put("type", "object");
        Map<String, Object> p2 = new HashMap<>();
        p2.put("deviceId", Map.of("type", "string", "description", "设备唯一标识编码或编号"));
        s2.put("properties", p2);
        s2.put("required", List.of("deviceId"));
        t2.put("inputSchema", s2);
        tools.add(t2);

        // 3. iot_device_control
        Map<String, Object> t3 = new HashMap<>();
        t3.put("name", "iot_device_control");
        t3.put("description", "向边缘物联设备安全下发反写控制指令（如设定注塑温度、设备启停控制、工艺参数微调）。所需权限范围: device.control");
        Map<String, Object> s3 = new HashMap<>();
        s3.put("type", "object");
        Map<String, Object> p3 = new HashMap<>();
        p3.put("deviceId", Map.of("type", "string", "description", "目标设备编码"));
        p3.put("command", Map.of("type", "string", "description", "指令动作: start/stop/reboot/set_param"));
        p3.put("params", Map.of("type", "object", "description", "指令参数键值对"));
        s3.put("properties", p3);
        s3.put("required", List.of("deviceId", "command"));
        t3.put("inputSchema", s3);
        tools.add(t3);

        // 4. iot_alarm_query
        Map<String, Object> t4 = new HashMap<>();
        t4.put("name", "iot_alarm_query");
        t4.put("description", "按设备与时间范围检索未处理的设备故障与历史严重告警记录。所需权限范围: alarm.read");
        Map<String, Object> s4 = new HashMap<>();
        s4.put("type", "object");
        Map<String, Object> p4 = new HashMap<>();
        p4.put("deviceId", Map.of("type", "string", "description", "设备编码(可选)"));
        p4.put("severity", Map.of("type", "integer", "description", "严重级别: 1提示, 2次要, 3严重, 4紧急"));
        s4.put("properties", p4);
        t4.put("inputSchema", s4);
        tools.add(t4);

        return tools;
    }

    /**
     * 执行 MCP 工具调用，严格校验租户上下文与授权范围 Scope
     */
    public Map<String, Object> executeTool(String toolName, Map<String, Object> args, Long tenantId, List<String> scopes, boolean isAdmin) {
        log.info("执行 MCP 工具调用: tool={}, tenantId={}, args={}, scopes={}, isAdmin={}",
                toolName, tenantId, args, scopes, isAdmin);

        // 1. 严格租户隔离校验
        if (tenantId == null) {
            throw new BizException(401, "MCP 工具执行拒绝: 缺少有效的租户上下文，严禁匿名或跨租户执行");
        }

        // 2. 细粒度 Scope 校验
        checkToolScope(toolName, scopes, isAdmin);

        Map<String, Object> result = new HashMap<>();

        if ("iot_device_list".equals(toolName)) {
            Map<String, String> params = new HashMap<>();
            if (args != null && args.containsKey("status")) {
                String st = String.valueOf(args.get("status"));
                if ("online".equalsIgnoreCase(st)) params.put("online", "1");
                else if ("offline".equalsIgnoreCase(st)) params.put("online", "0");
            }
            if (args != null && args.containsKey("pageNum")) params.put("pageNum", String.valueOf(args.get("pageNum")));
            if (args != null && args.containsKey("pageSize")) params.put("pageSize", String.valueOf(args.get("pageSize")));

            // 专线调用核心业务后端多租户独立数据库
            JsonNode resp = internalClient.get("/api/internal/open/devices", tenantId, params);
            if (resp != null && resp.has("code") && resp.get("code").asInt() == 200 && resp.has("data")) {
                JsonNode data = resp.get("data");
                result.put("tenantId", tenantId);
                result.put("total", data.has("total") ? data.get("total").asLong() : 0);
                result.put("devices", data.has("records") ? data.get("records") : List.of());
                return result;
            }

            // 非 mock 模式下直接明确报错
            if (!mockEnabled) {
                String errMsg = resp != null && resp.has("message") ? resp.get("message").asText() : "核心物联后端服务不可用或查询超时";
                throw new BizException(502, "召测设备列表失败: " + errMsg);
            }

            // 开发演示兜底
            result.put("tenantId", tenantId);
            result.put("isMock", true);
            result.put("total", 2);
            result.put("devices", List.of(
                    Map.of("deviceCode", "DEV20261009001", "deviceName", "1号注塑机 (海天MA1200)", "online", 1),
                    Map.of("deviceCode", "DEV20261009002", "deviceName", "2号注塑机 (海天MA2000)", "online", 0)
            ));
        } else if ("iot_telemetry_latest".equals(toolName)) {
            String deviceId = args != null && args.containsKey("deviceId") ? String.valueOf(args.get("deviceId")) : "";
            if (deviceId.isEmpty()) {
                throw new BizException(400, "缺少必填参数: deviceId");
            }

            JsonNode resp = internalClient.get("/api/internal/open/telemetry/latest", tenantId, Map.of("deviceId", deviceId));
            if (resp != null && resp.has("code") && resp.get("code").asInt() == 200 && resp.has("data")) {
                result.put("tenantId", tenantId);
                result.put("deviceId", deviceId);
                result.put("data", resp.get("data"));
                return result;
            }

            if (!mockEnabled) {
                String errMsg = resp != null && resp.has("message") ? resp.get("message").asText() : "后端遥测接口不可用或设备无数据";
                throw new BizException(502, "召测设备遥测失败: " + errMsg);
            }

            result.put("isMock", true);
            result.put("deviceId", deviceId);
            result.put("timestamp", System.currentTimeMillis());
            result.put("telemetry", Map.of(
                    "barrel_temp_zone1", 215.4,
                    "barrel_temp_zone2", 220.1,
                    "injection_pressure_mpa", 13.8,
                    "screw_speed_rpm", 85.0
            ));
        } else if ("iot_device_control".equals(toolName)) {
            // 控制指令下发：绝不能在后端失败时误报“EXECUTED”
            JsonNode resp = internalClient.post("/api/internal/open/commands", tenantId, args);
            if (resp != null && resp.has("code") && resp.get("code").asInt() == 200 && resp.has("data")) {
                result.put("tenantId", tenantId);
                result.put("success", true);
                result.put("status", "EXECUTED");
                result.put("data", resp.get("data"));
                return result;
            }

            String errMsg = resp != null && resp.has("message") ? resp.get("message").asText() : "后端指令网关通信超时或未响应";
            if (!mockEnabled) {
                log.error("下发设备控制指令失败: tool={}, tenantId={}, args={}, err={}", toolName, tenantId, args, errMsg);
                throw new BizException(502, "控制指令执行失败: " + errMsg);
            }

            result.put("isMock", true);
            result.put("success", false);
            result.put("status", "MOCK_MODE_REFUSED");
            result.put("message", "当前为开发演示模式，已拒绝向物理设备真实下发控制指令: " + errMsg);
        } else if ("iot_alarm_query".equals(toolName)) {
            Map<String, String> params = new HashMap<>();
            if (args != null && args.containsKey("deviceId")) params.put("deviceId", String.valueOf(args.get("deviceId")));
            if (args != null && args.containsKey("severity")) params.put("severity", String.valueOf(args.get("severity")));

            JsonNode resp = internalClient.get("/api/internal/open/alarms", tenantId, params);
            if (resp != null && resp.has("code") && resp.get("code").asInt() == 200 && resp.has("data")) {
                result.put("tenantId", tenantId);
                result.put("alarms", resp.get("data"));
                return result;
            }

            if (!mockEnabled) {
                String errMsg = resp != null && resp.has("message") ? resp.get("message").asText() : "后端告警接口不可用";
                throw new BizException(502, "查询告警失败: " + errMsg);
            }

            result.put("isMock", true);
            result.put("alarms", List.of(
                    Map.of("alarmId", "ALM-2026100901", "deviceId", "DEV20261009001", "severity", 3, "title", "模具温度异常过高")
            ));
        } else {
            throw new BizException(400, "未知的 MCP 工具名称: " + toolName);
        }

        return result;
    }

    private void checkToolScope(String toolName, List<String> scopes, boolean isAdmin) {
        if (isAdmin) return;

        String requiredScope;
        switch (toolName) {
            case "iot_device_list" -> requiredScope = "device.read";
            case "iot_telemetry_latest" -> requiredScope = "telemetry.read";
            case "iot_device_control" -> requiredScope = "device.control";
            case "iot_alarm_query" -> requiredScope = "alarm.read";
            default -> requiredScope = "all";
        }

        if (scopes == null || scopes.isEmpty()) {
            throw new BizException(403, "权限不足: 客户端未具备任何授权范围，无法调用 [" + toolName + "]");
        }

        String normReq = requiredScope.replace(":", ".");
        boolean match = false;
        for (String s : scopes) {
            String norm = s.trim().replace(":", ".");
            if (norm.equals(normReq) || norm.equals("all") || norm.equals("*")) {
                match = true;
                break;
            }
        }

        if (!match) {
            throw new BizException(403, "权限不足: 调用工具 [" + toolName + "] 需要具备 [" + requiredScope + "] 授权范围");
        }
    }
}