package handler

import (
	"net/http"
	"strconv"
	"strings"
	"time"

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

// ============ 访问统计管理端 API（全部 RequirePerm(PermSettings)） ============

func statsRange(c *gin.Context) string { return c.DefaultQuery("range", "7d") }

// GET /api/admin/stats/overview
func (h *Handlers) StatsOverview(c *gin.Context) {
	data, err := h.Visit.Overview(statsRange(c))
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取概览失败", "detail": err.Error()})
		return
	}
	c.JSON(http.StatusOK, data)
}

// GET /api/admin/stats/realtime
func (h *Handlers) StatsRealtime(c *gin.Context) {
	data, err := h.Visit.Realtime()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取实时数据失败", "detail": err.Error()})
		return
	}
	c.JSON(http.StatusOK, data)
}

// GET /api/admin/stats/sources
func (h *Handlers) StatsSources(c *gin.Context) {
	data, err := h.Visit.Sources(statsRange(c))
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取来源分析失败"})
		return
	}
	c.JSON(http.StatusOK, data)
}

// GET /api/admin/stats/pages?q=&page=&size=
func (h *Handlers) StatsPages(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
	data, err := h.Visit.Pages(statsRange(c), strings.TrimSpace(c.Query("q")), page, size)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取受访页面失败"})
		return
	}
	c.JSON(http.StatusOK, data)
}

// GET /api/admin/stats/visitors
func (h *Handlers) StatsVisitors(c *gin.Context) {
	data, err := h.Visit.Visitors(statsRange(c))
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取访客画像失败"})
		return
	}
	c.JSON(http.StatusOK, data)
}

// GET /api/admin/stats/security
func (h *Handlers) StatsSecurity(c *gin.Context) {
	data, err := h.Visit.Security(statsRange(c))
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取安全数据失败"})
		return
	}
	c.JSON(http.StatusOK, data)
}

// GET /api/admin/stats/events?kind=&bot=&path=&ip=&start=&end=&page=&size=
func (h *Handlers) StatsEvents(c *gin.Context) {
	f := service.VisitEventFilter{
		Kind: strings.TrimSpace(c.Query("kind")),
		Bot:  strings.TrimSpace(c.Query("bot")),
		Path: strings.TrimSpace(c.Query("path")),
		IP:   strings.TrimSpace(c.Query("ip")),
	}
	if v := c.Query("start"); v != "" {
		if t, err := time.Parse(time.RFC3339, v); err == nil {
			f.Start = t
		}
	}
	if v := c.Query("end"); v != "" {
		if t, err := time.Parse(time.RFC3339, v); err == nil {
			f.End = t
		}
	}
	f.Page, _ = strconv.Atoi(c.DefaultQuery("page", "1"))
	f.Size, _ = strconv.Atoi(c.DefaultQuery("size", "50"))
	data, err := h.Visit.Events(f)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取访问明细失败"})
		return
	}
	c.JSON(http.StatusOK, data)
}

// GET /api/admin/stats/settings — 开关/保留天数 + 容量信息
func (h *Handlers) StatsGetSettings(c *gin.Context) {
	data, err := h.Visit.SettingsPayload()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取设置失败"})
		return
	}
	c.JSON(http.StatusOK, data)
}

// PUT /api/admin/stats/settings
func (h *Handlers) StatsSaveSettings(c *gin.Context) {
	var body struct {
		Enabled       *bool `json:"enabled"`
		RetentionDays *int  `json:"retention_days"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "参数无效"})
		return
	}
	cur, err := h.Visit.SettingsPayload()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "读取当前设置失败"})
		return
	}
	enabled := cur.Enabled
	if body.Enabled != nil {
		enabled = *body.Enabled
	}
	days := cur.RetentionDays
	if body.RetentionDays != nil {
		days = *body.RetentionDays
	}
	if err := h.Visit.SaveSettings(enabled, days); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "保存失败，保留天数需在 7–365 之间"})
		return
	}
	data, err := h.Visit.SettingsPayload()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取设置失败"})
		return
	}
	c.JSON(http.StatusOK, data)
}

// POST /api/admin/stats/purge — 立即清理 N 天前明细（异步分批执行，受理即返回）
func (h *Handlers) StatsPurge(c *gin.Context) {
	var body struct {
		Days int `json:"days"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "参数无效"})
		return
	}
	if !h.Visit.PurgeBefore(body.Days) {
		c.JSON(http.StatusBadRequest, gin.H{"error": "天数需在 7–365 之间"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"ok": true})
}