// Package response 提供统一的 JSON 响应封装
package response

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

// Response 是所有 API 的统一响应结构
type Response struct {
	Code    int         `json:"code"`
	Message string      `json:"message"`
	Data    interface{} `json:"data,omitempty"`
}

// Success 返回成功响应
func Success(c *gin.Context, data interface{}) {
	c.JSON(http.StatusOK, Response{
		Code:    0,
		Message: "ok",
		Data:    data,
	})
}

// Fail 返回业务错误（HTTP 200 + 非零业务码）
func Fail(c *gin.Context, code int, message string) {
	c.JSON(http.StatusOK, Response{
		Code:    code,
		Message: message,
	})
}

// BadRequest 返回参数错误
func BadRequest(c *gin.Context, message string) {
	c.JSON(http.StatusBadRequest, Response{
		Code:    4000,
		Message: message,
	})
}

// NotFound 返回资源不存在
func NotFound(c *gin.Context, message string) {
	c.JSON(http.StatusNotFound, Response{
		Code:    4040,
		Message: message,
	})
}

// InternalError 返回服务端内部错误
func InternalError(c *gin.Context, message string) {
	c.JSON(http.StatusInternalServerError, Response{
		Code:    5000,
		Message: message,
	})
}

// WebSocketMessage 是 WebSocket 推送的统一消息格式
type WebSocketMessage struct {
	Type  string      `json:"type"`
	Data  interface{} `json:"data,omitempty"`
	Error string      `json:"error,omitempty"`
}

// ── WS 事件快捷构造器 ──

// WSFullState 全量快照推送（发起方 submit 后广播给所有人）
func WSFullState(sess interface{}) WebSocketMessage {
	return WebSocketMessage{Type: "full_state", Data: sess}
}

// WSParticipantJoined 新参与者加入
func WSParticipantJoined(nickname string) WebSocketMessage {
	return WebSocketMessage{
		Type: "participant_joined",
		Data: map[string]string{"nickname": nickname},
	}
}

// WSParticipantLeft 参与者离开
func WSParticipantLeft(nickname string) WebSocketMessage {
	return WebSocketMessage{
		Type: "participant_left",
		Data: map[string]string{"nickname": nickname},
	}
}

// WSParticipantSubmitted 参与者提交文本
func WSParticipantSubmitted(nickname string, resp interface{}) WebSocketMessage {
	return WebSocketMessage{
		Type: "participant_submitted",
		Data: map[string]interface{}{
			"nickname": nickname,
			"submit":   resp,
		},
	}
}

// WSInitiatorReady 发起方刚提交（所有参与者都会收到）
func WSInitiatorReady() WebSocketMessage {
	return WebSocketMessage{Type: "initiator_ready"}
}

// WSSessionExpired 会话过期
func WSSessionExpired() WebSocketMessage {
	return WebSocketMessage{Type: "session_expired"}
}

// WSSessionEnded 会话被发起方主动结束
func WSSessionEnded() WebSocketMessage {
	return WebSocketMessage{Type: "session_ended"}
}

// WSResubmitChanged 发起方切换了"允许参与者重新提交"开关
func WSResubmitChanged(allow bool) WebSocketMessage {
	return WebSocketMessage{
		Type: "resubmit_changed",
		Data: map[string]bool{"allow": allow},
	}
}