package api

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"

	"ws_usernode/internal/service"
)

// SettingsHandler 系统设置接口（admin，PLAN F7）。
type SettingsHandler struct {
	svc *service.SettingService
}

// NewSettingsHandler 创建设置 handler。
func NewSettingsHandler(svc *service.SettingService) *SettingsHandler {
	return &SettingsHandler{svc: svc}
}

// List GET /settings —— 全部设置项（config 默认值 + settings 覆盖）。
func (h *SettingsHandler) List(c *gin.Context) {
	items, err := h.svc.GetAll(c.Request.Context())
	if err != nil {
		fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	ok(c, gin.H{"items": items})
}

// SettingUpdateRequest 更新单个设置项。
type SettingUpdateRequest struct {
	Key   string `json:"key" binding:"required"`
	Value string `json:"value" binding:"required"`
}

// Update PUT /settings —— 更新设置项（仅白名单 key，值为时长格式）。
func (h *SettingsHandler) Update(c *gin.Context) {
	var req SettingUpdateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		fail(c, http.StatusBadRequest, "请求参数不合法: "+err.Error())
		return
	}
	if err := h.svc.Set(c.Request.Context(), req.Key, req.Value); err != nil {
		switch {
		case errors.Is(err, service.ErrSettingKeyUnknown):
			fail(c, http.StatusBadRequest, err.Error())
		case errors.Is(err, service.ErrSettingValueInvalid):
			fail(c, http.StatusBadRequest, err.Error())
		default:
			fail(c, http.StatusInternalServerError, err.Error())
		}
		return
	}
	ok(c, gin.H{"status": "updated", "key": req.Key, "value": req.Value})
}