package com.baiyue.eventbridge.controller;

import com.baiyue.common.core.api.ApiResponse;
import com.baiyue.common.event.EventEnvelope;
import com.baiyue.eventbridge.dto.BridgeStatus;
import com.baiyue.eventbridge.dto.EventReceiveResult;
import com.baiyue.eventbridge.service.EventInboxService;
import com.baiyue.eventbridge.security.InternalServiceTokenGuard;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.responses.ApiResponses;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 事件桥内部接口。生产环境必须在网关或基础设施层增加 mTLS 与来源白名单。
 */
@Tag(name = "事件桥内部接口", description = "跨区域事件的幂等接收与能力状态")
@RestController
@RequestMapping("/internal/event-bridge")
@RequiredArgsConstructor
public class EventBridgeController {
    private final EventInboxService eventInboxService;
    private final InternalServiceTokenGuard internalServiceTokenGuard;

    @Value("${baiyue.region:CN}")
    private String region;

    @Operation(summary = "幂等接收事件", description = "当前仅完成数据库接收骨架，不代表生产跨区传输和 mTLS 已开通")
    @ApiResponses({
            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "事件已接收或判定为重复"),
            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "401", description = "内部服务令牌无效"),
            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "503", description = "内部服务令牌未配置，接收接口关闭")
    })
    @PostMapping("/events")
    public ApiResponse<EventReceiveResult> receive(
            @Parameter(description = "内部服务共享令牌")
            @RequestHeader(value = "X-Internal-Service-Token", required = false) String token,
            @RequestBody EventEnvelope envelope) {
        internalServiceTokenGuard.verify(token);
        return ApiResponse.success(eventInboxService.receive(envelope));
    }

    @Operation(summary = "查询事件桥能力状态")
    @ApiResponses(@io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "查询成功"))
    @GetMapping("/status")
    public ApiResponse<BridgeStatus> status() {
        return ApiResponse.success(new BridgeStatus("运行中", region, true, false));
    }
}