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"`
	AllowComments        *bool     `json:"allow_comments"`
	AllowMessages        *bool     `json:"allow_messages"`
	PostCooldownHours    *int      `json:"post_cooldown_hours"`
	CodeBlockAutoFold    *bool     `json:"code_block_auto_fold"`
	CodeBlockFoldLines   *int      `json:"code_block_fold_lines"`
	UIAnimations         *bool     `json:"ui_animations"`
	AnimCodeFold         *bool     `json:"anim_code_fold"`
	AnimSmoothScroll     *bool     `json:"anim_smooth_scroll"`
	AnimChrome           *bool     `json:"anim_chrome"`
	PostLinkNewTab       *bool     `json:"post_link_new_tab"`
	AttachmentExtLimit   *bool     `json:"attachment_ext_limit"`
	AttachmentExts       *[]string `json:"attachment_exts"`
	AttachmentMaxMB      *int      `json:"attachment_max_mb"`
	AttachmentMaxCount   *int      `json:"attachment_max_count"`
	ImageMaxMB           *int      `json:"image_max_mb"`
	BgSiteURL            *string   `json:"bg_site_url"`
	BgSiteMode           *string   `json:"bg_site_mode"`
	BgAdminURL           *string   `json:"bg_admin_url"`
	BgAdminMode          *string   `json:"bg_admin_mode"`
	TimelineGitImport    *string   `json:"timeline_git_import"` // 超管专用；不进公开 settings / WS 广播
}

func settingsPayload(saved service.PublicSiteSettings) gin.H {
	return gin.H{
		"accent":                 saved.Accent,
		"trust_reviewed_publish": saved.TrustReviewedPublish,
		"site_name":              saved.SiteName,
		"site_description":       saved.SiteDescription,
		"allow_register":         saved.AllowRegister,
		"allow_comments":         saved.AllowComments,
		"allow_messages":         saved.AllowMessages,
		"post_cooldown_hours":    saved.PostCooldownHours,
		"code_block_auto_fold":   saved.CodeBlockAutoFold,
		"code_block_fold_lines":  saved.CodeBlockFoldLines,
		"ui_animations":          saved.UIAnimations,
		"anim_code_fold":         saved.AnimCodeFold,
		"anim_smooth_scroll":     saved.AnimSmoothScroll,
		"anim_chrome":            saved.AnimChrome,
		"post_link_new_tab":      saved.PostLinkNewTab,
		"attachment_ext_limit":   saved.AttachmentExtLimit,
		"attachment_exts":        saved.AttachmentExts,
		"attachment_max_mb":      saved.AttachmentMaxMB,
		"attachment_max_count":   saved.AttachmentMaxCount,
		"image_max_mb":           saved.ImageMaxMB,
		"bg_site_url":            saved.BgSiteURL,
		"bg_site_mode":           saved.BgSiteMode,
		"bg_admin_url":           saved.BgAdminURL,
		"bg_admin_mode":          saved.BgAdminMode,
	}
}

func (req *updateSettingsRequest) hasAny() bool {
	return req.Accent != nil || req.TrustReviewedPublish != nil || req.SiteName != nil ||
		req.SiteDescription != nil || req.AllowRegister != nil || req.AllowComments != nil ||
		req.AllowMessages != nil || req.PostCooldownHours != nil || req.CodeBlockAutoFold != nil ||
		req.CodeBlockFoldLines != nil || req.UIAnimations != nil || req.AnimCodeFold != nil ||
		req.AnimSmoothScroll != nil || req.AnimChrome != nil || req.PostLinkNewTab != nil ||
		req.AttachmentExtLimit != nil || req.AttachmentExts != nil || req.AttachmentMaxMB != nil ||
		req.AttachmentMaxCount != nil || req.ImageMaxMB != nil ||
		req.BgSiteURL != nil || req.BgSiteMode != nil ||
		req.BgAdminURL != nil || req.BgAdminMode != nil || req.TimelineGitImport != nil
}

// AdminGetSettings 超管读取站点设置（含 timeline_git_import，不进公开 /api/settings）
func (h *Handlers) AdminGetSettings(c *gin.Context) {
	saved, err := h.Setting.Public()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取站点设置失败"})
		return
	}
	adapter, err := h.Setting.TimelineGitAdapterJSON()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取提交导入配置失败"})
		return
	}
	out := settingsPayload(saved)
	out["timeline_git_import"] = adapter
	c.JSON(http.StatusOK, out)
}

// 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.hasAny() {
		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.AllowComments != nil {
		if err := h.Setting.SetAllowComments(*req.AllowComments); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AllowMessages != nil {
		if err := h.Setting.SetAllowMessages(*req.AllowMessages); 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
		}
	}
	if req.CodeBlockAutoFold != nil {
		if err := h.Setting.SetCodeBlockAutoFold(*req.CodeBlockAutoFold); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.CodeBlockFoldLines != nil {
		if err := h.Setting.SetCodeBlockFoldLines(*req.CodeBlockFoldLines); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "折叠行数须为 0–100"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.UIAnimations != nil {
		if err := h.Setting.SetUIAnimations(*req.UIAnimations); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AnimCodeFold != nil {
		if err := h.Setting.SetAnimCodeFold(*req.AnimCodeFold); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AnimSmoothScroll != nil {
		if err := h.Setting.SetAnimSmoothScroll(*req.AnimSmoothScroll); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AnimChrome != nil {
		if err := h.Setting.SetAnimChrome(*req.AnimChrome); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.PostLinkNewTab != nil {
		if err := h.Setting.SetPostLinkNewTab(*req.PostLinkNewTab); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AttachmentExtLimit != nil {
		if err := h.Setting.SetAttachmentExtLimit(*req.AttachmentExtLimit); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AttachmentExts != nil {
		if err := h.Setting.SetAttachmentExts(*req.AttachmentExts); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "扩展名无效或数量超限（最多 80 个，仅字母数字）"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AttachmentMaxMB != nil {
		if err := h.Setting.SetAttachmentMaxMB(*req.AttachmentMaxMB); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "附件上限须至少 1MB"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.AttachmentMaxCount != nil {
		if err := h.Setting.SetAttachmentMaxCount(*req.AttachmentMaxCount); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "每帖附件数须为 1–20"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.ImageMaxMB != nil {
		if err := h.Setting.SetImageMaxMB(*req.ImageMaxMB); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "插图上限须至少 1MB"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.BgSiteURL != nil {
		if err := h.applyBgURL(service.BgSurfaceSite, *req.BgSiteURL); err != nil {
			writeBgSettingError(c, err)
			return
		}
	}
	if req.BgAdminURL != nil {
		if err := h.applyBgURL(service.BgSurfaceAdmin, *req.BgAdminURL); err != nil {
			writeBgSettingError(c, err)
			return
		}
	}
	if req.BgSiteMode != nil {
		if err := h.Setting.SetBgSiteMode(*req.BgSiteMode); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "无效的背景铺放模式"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}
	if req.BgAdminMode != nil {
		if err := h.Setting.SetBgAdminMode(*req.BgAdminMode); err != nil {
			if errors.Is(err, service.ErrInvalidSiteSetting) {
				c.JSON(http.StatusBadRequest, gin.H{"error": "无效的背景铺放模式"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": "保存站点设置失败"})
			return
		}
	}

	var savedAdapter string
	if req.TimelineGitImport != nil {
		normalized, err := h.Setting.SetTimelineGitAdapterJSON(*req.TimelineGitImport)
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		savedAdapter = normalized
	}

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

	payload := settingsPayload(saved)
	h.Hub.BroadcastAll(realtime.Envelope{
		Type: realtime.EventSettingsChanged,
		Data: payload,
	})
	out := settingsPayload(saved)
	out["ok"] = true
	if req.TimelineGitImport != nil {
		out["timeline_git_import"] = savedAdapter
	}
	c.JSON(http.StatusOK, out)
}

func writeBgSettingError(c *gin.Context, err error) {
	if errors.Is(err, service.ErrInvalidSiteSetting) {
		c.JSON(http.StatusBadRequest, gin.H{"error": "背景图地址无效"})
		return
	}
	if errors.Is(err, service.ErrBgFileMissing) {
		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"})
}

// applyBgURL 写入对应轨的背景 URL，并删除不再被引用的旧文件
func (h *Handlers) applyBgURL(surface, url string) error {
	u, ok := service.NormalizeBgURL(url)
	if !ok {
		return service.ErrInvalidSiteSetting
	}
	if u != "" && !h.Upload.BackgroundFileExists(u) {
		return service.ErrBgFileMissing
	}
	oldSite, err := h.Setting.BgSiteURL()
	if err != nil {
		return err
	}
	oldAdmin, err := h.Setting.BgAdminURL()
	if err != nil {
		return err
	}
	if surface == service.BgSurfaceAdmin {
		if err := h.Setting.SetBgAdminURL(u); err != nil {
			return err
		}
		h.Upload.RemoveBackgroundIfUnused(oldAdmin, oldSite, u)
		return nil
	}
	if err := h.Setting.SetBgSiteURL(u); err != nil {
		return err
	}
	h.Upload.RemoveBackgroundIfUnused(oldSite, u, oldAdmin)
	return nil
}