package handler

import (
	"crypto/rand"
	"encoding/base64"
	"encoding/json"
	"net/http"
	"strings"

	"soul-api/internal/cache"
	"soul-api/internal/database"
	"soul-api/internal/model"

	"github.com/gin-gonic/gin"
)

const linkedMpConfigKey = "linked_miniprograms"

// LinkedMpItem 关联小程序项，key 为 32 位密钥，链接标签存 key，小程序端用 key 查 appId
type LinkedMpItem struct {
	Key   string `json:"key"`
	Name  string `json:"name"`
	AppID string `json:"appId"`
	Path  string `json:"path,omitempty"`
	Sort  int    `json:"sort"`
}

// AdminLinkedMpList GET /api/admin/linked-miniprograms 管理端-关联小程序列表
func AdminLinkedMpList(c *gin.Context) {
	db := database.DB()
	var row model.SystemConfig
	if err := db.Where("config_key = ?", linkedMpConfigKey).First(&row).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": true, "data": []LinkedMpItem{}})
		return
	}
	var list []LinkedMpItem
	if err := json.Unmarshal(row.ConfigValue, &list); err != nil {
		c.JSON(http.StatusOK, gin.H{"success": true, "data": []LinkedMpItem{}})
		return
	}
	if list == nil {
		list = []LinkedMpItem{}
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": list})
}

// AdminLinkedMpCreate POST /api/admin/linked-miniprograms 管理端-新增关联小程序
func AdminLinkedMpCreate(c *gin.Context) {
	var body struct {
		Name  string `json:"name" binding:"required"`
		AppID string `json:"appId" binding:"required"`
		Path  string `json:"path"`
		Sort  int    `json:"sort"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "请填写小程序名称和 AppID"})
		return
	}
	body.Name = trimSpace(body.Name)
	body.AppID = trimSpace(body.AppID)
	if body.Name == "" || body.AppID == "" {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "小程序名称和 AppID 不能为空"})
		return
	}
	key, err := genMpKey()
	if err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "生成密钥失败"})
		return
	}
	item := LinkedMpItem{Key: key, Name: body.Name, AppID: body.AppID, Path: body.Path, Sort: body.Sort}
	db := database.DB()
	var row model.SystemConfig
	var list []LinkedMpItem
	if err := db.Where("config_key = ?", linkedMpConfigKey).First(&row).Error; err != nil {
		list = []LinkedMpItem{}
	} else {
		_ = json.Unmarshal(row.ConfigValue, &list)
		if list == nil {
			list = []LinkedMpItem{}
		}
	}
	list = append(list, item)
	valBytes, _ := json.Marshal(list)
	desc := "关联小程序列表，用于 wx.navigateToMiniProgram 跳转"
	if row.ConfigKey == "" {
		row = model.SystemConfig{ConfigKey: linkedMpConfigKey, ConfigValue: valBytes, Description: &desc}
		if err := db.Create(&row).Error; err != nil {
			c.JSON(http.StatusOK, gin.H{"success": false, "error": "保存失败: " + err.Error()})
			return
		}
	} else {
		row.ConfigValue = valBytes
		if err := db.Save(&row).Error; err != nil {
			c.JSON(http.StatusOK, gin.H{"success": false, "error": "保存失败: " + err.Error()})
			return
		}
	}
	cache.InvalidateConfig()
	c.JSON(http.StatusOK, gin.H{"success": true, "data": item})
}

// AdminLinkedMpUpdate PUT /api/admin/linked-miniprograms 管理端-编辑关联小程序
func AdminLinkedMpUpdate(c *gin.Context) {
	var body struct {
		Key   string `json:"key" binding:"required"`
		Name  string `json:"name" binding:"required"`
		AppID string `json:"appId" binding:"required"`
		Path  string `json:"path"`
		Sort  int    `json:"sort"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "参数无效"})
		return
	}
	body.Name = trimSpace(body.Name)
	body.AppID = trimSpace(body.AppID)
	if body.Name == "" || body.AppID == "" {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "小程序名称和 AppID 不能为空"})
		return
	}
	db := database.DB()
	var row model.SystemConfig
	if err := db.Where("config_key = ?", linkedMpConfigKey).First(&row).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "未找到该记录"})
		return
	}
	var list []LinkedMpItem
	if err := json.Unmarshal(row.ConfigValue, &list); err != nil || list == nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "数据格式错误"})
		return
	}
	found := false
	for i := range list {
		if list[i].Key == body.Key {
			list[i].Name = body.Name
			list[i].AppID = body.AppID
			list[i].Path = body.Path
			list[i].Sort = body.Sort
			found = true
			break
		}
	}
	if !found {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "未找到该记录"})
		return
	}
	valBytes, _ := json.Marshal(list)
	row.ConfigValue = valBytes
	if err := db.Save(&row).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "保存失败: " + err.Error()})
		return
	}
	cache.InvalidateConfig()
	c.JSON(http.StatusOK, gin.H{"success": true})
}

// AdminLinkedMpDelete DELETE /api/admin/linked-miniprograms/:id 管理端-删除（:id 实际传 key）
func AdminLinkedMpDelete(c *gin.Context) {
	key := c.Param("id")
	if key == "" {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "缺少密钥"})
		return
	}
	db := database.DB()
	var row model.SystemConfig
	if err := db.Where("config_key = ?", linkedMpConfigKey).First(&row).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "未找到该记录"})
		return
	}
	var list []LinkedMpItem
	if err := json.Unmarshal(row.ConfigValue, &list); err != nil || list == nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "数据格式错误"})
		return
	}
	newList := make([]LinkedMpItem, 0, len(list))
	for _, item := range list {
		if item.Key != key {
			newList = append(newList, item)
		}
	}
	valBytes, _ := json.Marshal(newList)
	row.ConfigValue = valBytes
	if err := db.Save(&row).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "删除失败: " + err.Error()})
		return
	}
	cache.InvalidateConfig()
	c.JSON(http.StatusOK, gin.H{"success": true})
}

// genMpKey 生成 32 位英文+数字密钥，供链接标签引用
func genMpKey() (string, error) {
	b := make([]byte, 24)
	if _, err := rand.Read(b); err != nil {
		return "", err
	}
	// base64 编码后取 32 位，去掉 +/= 仅保留字母数字
	s := base64.URLEncoding.EncodeToString(b)
	s = strings.ReplaceAll(s, "+", "")
	s = strings.ReplaceAll(s, "/", "")
	s = strings.ReplaceAll(s, "=", "")
	if len(s) >= 32 {
		return s[:32], nil
	}
	return s + "0123456789abcdefghijklmnopqrstuv"[:(32-len(s))], nil
}