package handler

import (
	"errors"
	"net/http"

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

// GET /api/settings
func (h *Handlers) PublicSettings(c *gin.Context) {
	s, err := h.Setting.Public()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取站点设置失败"})
		return
	}
	c.JSON(http.StatusOK, s)
}

// updateSettingsRequest 字段均为可选指针：只更新请求里出现的项，避免外观页覆盖其它设置
type updateSettingsRequest struct {
	Accent               *string `json:"accent"`
	TrustReviewedPublish *bool   `json:"trust_reviewed_publish"`
	SiteName             *string `json:"site_name"`
	SiteDescription      *string `json:"site_description"`
	AllowRegister        *bool   `json:"allow_register"`
	PostCooldownHours    *int    `json:"post_cooldown_hours"`
}

// 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 && req.SiteName == nil &&
		req.SiteDescription == nil && req.AllowRegister == nil && req.PostCooldownHours == nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "未提供任何可更新的设置项"})
		return
	}

	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
		}
	}
	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
		}
	}
	if req.SiteName != nil {
		if err := h.Setting.SetSiteName(*req.SiteName); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "站点名称过长或无效"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.SiteDescription != nil {
		if err := h.Setting.SetSiteDescription(*req.SiteDescription); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "站点简介过长"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AllowRegister != nil {
		if err := h.Setting.SetAllowRegister(*req.AllowRegister); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.PostCooldownHours != nil {
		if err := h.Setting.SetPostCooldownHours(*req.PostCooldownHours); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "冷静期须为 0–168 小时"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}

	saved, err := h.Setting.Public()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取站点设置失败"})
		return
	}

	h.Hub.BroadcastAll(realtime.Envelope{
		Type: realtime.EventSettingsChanged,
		Data: gin.H{
			"accent":                 saved.Accent,
			"trust_reviewed_publish": saved.TrustReviewedPublish,
			"site_name":              saved.SiteName,
			"site_description":       saved.SiteDescription,
			"allow_register":         saved.AllowRegister,
			"post_cooldown_hours":    saved.PostCooldownHours,
		},
	})
	c.JSON(http.StatusOK, gin.H{
		"ok":                     true,
		"accent":                 saved.Accent,
		"trust_reviewed_publish": saved.TrustReviewedPublish,
		"site_name":              saved.SiteName,
		"site_description":       saved.SiteDescription,
		"allow_register":         saved.AllowRegister,
		"post_cooldown_hours":    saved.PostCooldownHours,
	})
}