package app

import (
	"verification-platform-backend/internal/database"
	"verification-platform-backend/internal/model"
	"verification-platform-backend/internal/service"
	"verification-platform-backend/pkg/response"

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

func SetupInfoRoutes(r *gin.RouterGroup) {
	r.GET("/info", handleAppGetInfo)
	r.GET("/check-update", handleAppCheckUpdate)
	r.GET("/announcements", handleAppGetAnnouncements)
}

func handleAppGetInfo(c *gin.Context) {
	appKey := c.Param("appKey")
	var app model.Application
	if err := database.DB.Where("app_key = ?", appKey).First(&app).Error; err != nil {
		response.Error(c, 404, "应用不存在")
		return
	}

	if service.GetApplicationDisabledStatus(app.ID) {
		response.Error(c, 403, "该应用已被禁用")
		return
	}

	response.Success(c, gin.H{
		"id":                 app.ID,
		"name":               app.Name,
		"description":        app.Description,
		"icon_url":           app.IconURL,
		"status":             app.Status,
		"billing_type":       app.BillingType,
		"login_policy":       app.LoginPolicy,
		"max_devices":        app.MaxDevices,
		"multi_open_mode":    app.MultiOpenMode,
		"max_instances":      app.MaxInstances,
		"enable_trial":       app.EnableTrial,
		"trial_balance":      app.TrialBalance,
		"heartbeat_interval": app.HeartbeatInterval,
		"heartbeat_timeout":  app.HeartbeatTimeout,
	})
}

func handleAppCheckUpdate(c *gin.Context) {
	appKey := c.Param("appKey")
	clientVersion := c.Query("version")

	var app model.Application
	if err := database.DB.Where("app_key = ?", appKey).First(&app).Error; err != nil {
		response.Error(c, 404, "应用不存在")
		return
	}

	if service.GetApplicationDisabledStatus(app.ID) {
		response.Error(c, 403, "该应用已被禁用")
		return
	}

	// 查询该应用的所有版本，按ID降序（创建顺序）
	var allVersions []model.Version
	if err := database.DB.Where("application_id = ? AND status = ?", app.ID, "active").
		Order("id DESC").
		Preload("Files").
		Find(&allVersions).Error; err != nil {
		response.Error(c, 500, "获取版本列表失败")
		return
	}

	// 没有任何版本
	if len(allVersions) == 0 {
		response.Success(c, gin.H{
			"has_update":      false,
			"current_version": clientVersion,
			"latest_version":  "",
			"download_url":    "",
			"update_notes":    "",
			"update_strategy": "",
			"update_method":   "",
			"files":           []interface{}{},
		})
		return
	}

	// 客户端必须提供版本号
	if clientVersion == "" {
		response.Error(c, 400, "请提供客户端版本号")
		return
	}

	// 找到客户端当前版本对应的版本记录
	var clientVersionRecord *model.Version
	for i := range allVersions {
		if allVersions[i].Version == clientVersion {
			clientVersionRecord = &allVersions[i]
			break
		}
	}

	// 客户端版本不存在于服务器版本列表中，返回错误
	if clientVersionRecord == nil {
		response.Error(c, 404, "客户端版本不存在")
		return
	}

	// 判断客户端版本状态：检查是否有更高ID的强制更新版本
	isSuperseded := false
	for i := range allVersions {
		v := &allVersions[i]
		// 存在ID更高（创建时间更晚）的强制更新版本
		if v.ID > clientVersionRecord.ID && v.UpdateStrategy == "forced" {
			isSuperseded = true
			break
		}
	}

	// 如果被取代（有强制更新），必须更新
	// 找到最新的强制更新版本
	var latestVersion *model.Version
	var updateStrategy string

	if isSuperseded {
		// 找到ID最高的强制更新版本
		for i := range allVersions {
			v := &allVersions[i]
			if v.ID > clientVersionRecord.ID && v.UpdateStrategy == "forced" {
				if latestVersion == nil || v.ID > latestVersion.ID {
					latestVersion = v
				}
			}
		}
		updateStrategy = "forced"
	} else {
		// 没有强制更新，检查是否有更高ID的版本（普通更新）
		// 最新版本就是ID最高的版本（已经是按ID降序排列，第一个就是最新）
		latestVersion = &allVersions[0]

		// 只有当最新版本ID大于客户端版本ID时才需要更新
		if latestVersion.ID > clientVersionRecord.ID {
			updateStrategy = latestVersion.UpdateStrategy // optional 或 forced
		} else {
			// 已经是最新版本
			response.Success(c, gin.H{
				"has_update":      false,
				"current_version": clientVersion,
				"latest_version":  clientVersionRecord.Version,
				"download_url":    "",
				"update_notes":    "",
				"update_strategy": "",
				"update_method":   "",
				"files":           []interface{}{},
			})
			return
		}
	}

	// 构建文件列表
	files := make([]map[string]interface{}, len(latestVersion.Files))
	for i, f := range latestVersion.Files {
		files[i] = map[string]interface{}{
			"file_path":   f.FilePath,
			"file_name":   f.FileName,
			"file_size":   f.FileSize,
			"file_hash":   f.FileHash,
			"file_type":   f.FileType,
			"is_required": f.IsRequired,
		}
	}

	// 构建返回结果
	result := map[string]interface{}{
		"has_update":      true,
		"current_version": clientVersion,
		"latest_version":  latestVersion.Version,
		"download_url":    latestVersion.FilePath,
		"file_size":       latestVersion.FileSize,
		"file_hash":       latestVersion.FileHash,
		"entry_file":      latestVersion.EntryFile,
		"update_notes":    latestVersion.Description,
		"update_strategy": updateStrategy,
		"update_type":     latestVersion.UpdateType,
		"update_method":   latestVersion.UpdateMethod,
		"changelog":       latestVersion.Changelog,
		"files":           files,
	}

	// 检查是否有适合客户端版本的增量更新
	// 查找以客户端版本为基础版本的 patch 更新
	var patchVersion model.Version
	err := database.DB.Where("application_id = ? AND update_type = ? AND base_version_id = ? AND status = ?",
		app.ID, "patch", clientVersionRecord.ID, "active").
		Order("id DESC").
		Preload("Files").
		First(&patchVersion).Error

	if err == nil {
		// 找到了增量更新
		result["is_patch"] = true
		result["base_version"] = clientVersion
		result["patch_url"] = patchVersion.FilePath
		result["patch_size"] = patchVersion.FileSize
		result["patch_hash"] = patchVersion.FileHash
	}

	response.Success(c, result)
}

func handleAppGetAnnouncements(c *gin.Context) {
	appKey := c.Param("appKey")
	var app model.Application
	if err := database.DB.Where("app_key = ?", appKey).First(&app).Error; err != nil {
		response.Error(c, 404, "应用不存在")
		return
	}

	if service.GetApplicationDisabledStatus(app.ID) {
		response.Error(c, 403, "该应用已被禁用")
		return
	}

	var announcements []model.Announcement
	if err := database.DB.Where("application_id = ? AND status = ?", app.ID, "active").Order("is_top DESC, created_at DESC").Find(&announcements).Error; err != nil {
		response.Error(c, 500, "获取公告失败")
		return
	}

	result := make([]gin.H, len(announcements))
	for i, a := range announcements {
		result[i] = gin.H{
			"id":         a.ID,
			"title":      a.Title,
			"content":    a.Content,
			"type":       a.Type,
			"is_top":     a.IsTop,
			"created_at": a.CreatedAt,
		}
	}

	response.Success(c, result)
}