package handler

import (
	"errors"
	"net/http"
	"strings"

	"github.com/freefire/jiang13-bbs/realtime"
	"github.com/freefire/jiang13-bbs/service"
	"github.com/gin-gonic/gin"
)

// PublicSettings 公开站点设置（无需登录）：前端 SSR 据此注入主题 CSS 变量等
// GET /api/settings
func (h *Handlers) PublicSettings(c *gin.Context) {
	accent, err := h.Setting.AccentColor()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取站点设置失败"})
		return
	}
	trust, err := h.Setting.TrustReviewedPublish()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取站点设置失败"})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"accent":                 accent,
		"trust_reviewed_publish": trust,
	})
}

// updateSettingsRequest 字段均为可选指针：只更新请求里出现的项，避免外观页覆盖审核策略
type updateSettingsRequest struct {
	// Accent 主题色 #RRGGBB；空串恢复默认
	Accent *string `json:"accent"`
	// TrustReviewedPublish 已过审用户后续内容免审
	TrustReviewedPublish *bool `json:"trust_reviewed_publish"`
}

// UpdateSettings 更新站点设置（管理员）
// PUT /api/admin/settings
func (h *Handlers) UpdateSettings(c *gin.Context) {
	var req updateSettingsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效"})
		return
	}
	if req.Accent == nil && req.TrustReviewedPublish == nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "未提供任何可更新的设置项"})
		return
	}

	savedAccent := ""
	if req.Accent != nil {
		if err := h.Setting.SetAccent(*req.Accent); err != nil {
			if errors.Is(err, service.ErrInvalidAccent) {
				c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
		savedAccent = strings.ToLower(strings.TrimSpace(*req.Accent))
	} else {
		var err error
		savedAccent, err = h.Setting.AccentColor()
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "获取站点设置失败"})
			return
		}
	}

	trustOn := true
	if req.TrustReviewedPublish != nil {
		if err := h.Setting.SetTrustReviewedPublish(*req.TrustReviewedPublish); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
		trustOn = *req.TrustReviewedPublish
	} else {
		var err error
		trustOn, err = h.Setting.TrustReviewedPublish()
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "获取站点设置失败"})
			return
		}
	}

	// 归一化后广播：主题色客户端热换肤；免审开关由下次发帖/发评读库生效
	h.Hub.BroadcastAll(realtime.Envelope{
		Type: realtime.EventSettingsChanged,
		Data: gin.H{
			"accent":                 savedAccent,
			"trust_reviewed_publish": trustOn,
		},
	})
	c.JSON(http.StatusOK, gin.H{
		"ok":                     true,
		"accent":                 savedAccent,
		"trust_reviewed_publish": trustOn,
	})
}