/*
 * Copyright (c) Mengning Software. 2025. All rights reserved.
 * Authors: DevStar Team,  panshuxiao
 * Create: 2025-11-19
 * Description: User settings handlers for AppStore UI.
 */

// Copyright 2024 The Devstar Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package setting

import (
	"io"
	"net/http"
	"strings"

	appstore_model "code.gitea.io/gitea/models/appstore"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/templates"
	"code.gitea.io/gitea/services/appstore"
	"code.gitea.io/gitea/services/context"
)

const (
	tplSettingsAppStore templates.TplName = "user/settings/appstore"
)

// AppStore displays the app store page
func AppStore(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("settings.appstore")
	ctx.Data["PageIsSettingsAppStore"] = true
	ctx.Data["UserDisabledFeatures"] = user_model.DisabledFeaturesWithLoginType(ctx.Doer)
	ctx.HTML(http.StatusOK, tplSettingsAppStore)
}

// AppStoreAPI handles API requests for app store data
func AppStoreAPI(ctx *context.Context) {
	action := ctx.PathParam("action")

	switch action {
	case "apps":
		handleGetApps(ctx)
	case "categories":
		handleGetCategories(ctx)
	case "tags":
		handleGetTags(ctx)
	default:
		ctx.JSON(http.StatusBadRequest, map[string]interface{}{
			"error": "Invalid action",
		})
	}
}

// handleGetApps returns the list of apps from database
func handleGetApps(ctx *context.Context) {
	// Get query parameters
	category := ctx.FormString("category")
	tag := ctx.FormString("tag")
	search := ctx.FormString("search")
	deployment := ctx.FormString("deployment") // docker, kubernetes
	source := ctx.FormString("source")         // local | devstar

	manager := appstore.NewManager(ctx, ctx.Doer.ID)

	var apps []appstore.App
	var err error

	if source == "devstar" {
		apps, err = manager.ListAppsFromDevstar()
		if err == nil {
			// 与本地一致的过滤逻辑（先拿全量，再在服务端筛选）
			if category != "" || tag != "" || search != "" || deployment != "" {
				var filtered []appstore.App
				for _, a := range apps {
					if category != "" && a.Category != category {
						continue
					}
					if tag != "" {
						matched := false
						for _, t := range a.Tags {
							if t == tag {
								matched = true
								break
							}
						}
						if !matched {
							continue
						}
					}
					if deployment != "" {
						// 处理部署类型过滤，包括 'both' 类型
						appDeployment := a.DeploymentType
						if appDeployment == "" {
							// 如果没有 deployment_type 字段，尝试从其他字段获取
							if a.Deploy.Type != "" {
								appDeployment = a.Deploy.Type
							} else {
								appDeployment = "docker" // 默认值
							}
						}

						if appDeployment != "both" && appDeployment != deployment {
							continue
						}
					}
					if search != "" {
						low := strings.ToLower(search)
						nameOk := strings.Contains(strings.ToLower(a.Name), low)
						descOk := strings.Contains(strings.ToLower(a.Description), low)
						authorOk := strings.Contains(strings.ToLower(a.Author), low)
						if !(nameOk || descOk || authorOk) {
							continue
						}
					}
					filtered = append(filtered, a)
				}
				apps = filtered
			}
		}
	} else {
		if search != "" {
			// Convert tag parameter to tags slice
			var tags []string
			if tag != "" {
				tags = strings.Split(tag, ",")
			}
			apps, err = manager.SearchApps(search, category, tags)
		} else {
			apps, err = manager.ListApps()

			// Filter by category, tag and deployment if specified
			if category != "" || tag != "" || deployment != "" {
				var filteredApps []appstore.App
				for _, app := range apps {
					matchCategory := category == "" || app.Category == category
					matchTag := tag == ""
					if tag != "" {
						for _, appTag := range app.Tags {
							if appTag == tag {
								matchTag = true
								break
							}
						}
					}

					// 处理部署类型过滤，包括 'both' 类型
					matchDeployment := deployment == ""
					if deployment != "" {
						appDeployment := app.DeploymentType
						if appDeployment == "" {
							// 如果没有 deployment_type 字段，尝试从其他字段获取
							if app.Deploy.Type != "" {
								appDeployment = app.Deploy.Type
							} else {
								appDeployment = "docker" // 默认值
							}
						}

						matchDeployment = appDeployment == "both" || appDeployment == deployment
					}

					if matchCategory && matchTag && matchDeployment {
						filteredApps = append(filteredApps, app)
					}
				}
				apps = filteredApps
			}
		}
	}

	if err != nil {
		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
			"error": err.Error(),
		})
		return
	}

	ctx.JSON(http.StatusOK, map[string]interface{}{
		"apps": apps,
	})
}

// handleGetCategories returns the list of categories
func handleGetCategories(ctx *context.Context) {
	categories, err := appstore_model.GetCategories(ctx)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
			"error": err.Error(),
		})
		return
	}

	ctx.JSON(http.StatusOK, map[string]interface{}{
		"categories": categories,
	})
}

// handleGetTags returns the list of tags
func handleGetTags(ctx *context.Context) {
	tags, err := appstore_model.GetTags(ctx)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, map[string]interface{}{
			"error": err.Error(),
		})
		return
	}

	ctx.JSON(http.StatusOK, map[string]interface{}{
		"tags": tags,
	})
}

// AppStoreStatus handles app instance status requests
func AppStoreStatus(ctx *context.Context) {
	appID := ctx.PathParam("app_id")
	if appID == "" {
		ctx.JSON(http.StatusBadRequest, map[string]interface{}{
			"error": "应用ID不能为空",
		})
		return
	}

	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	status, err := manager.GetAppStatus(appID)
	if err != nil {
		if appErr, ok := err.(*appstore.AppStoreError); ok {
			ctx.JSON(http.StatusNotFound, map[string]interface{}{
				"error": appErr.Message,
			})
		} else {
			ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
				"error": "获取应用状态失败",
			})
		}
		return
	}

	ctx.JSON(http.StatusOK, status)
}

// AppStoreInstall handles app installation
func AppStoreInstall(ctx *context.Context) {
	// 检查用户登录状态
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	if ctx.Req.Method != "POST" {
		ctx.JSON(405, map[string]string{"error": "Method Not Allowed"})
		return
	}

	// 解析表单数据
	appID := ctx.FormString("app_id")
	configJSON := ctx.FormString("config")
	installTarget := ctx.FormString("install_target")
	k8sURL := ctx.FormString("k8s_url")
	token := ctx.FormString("k8s_token")

	if appID == "" {
		ctx.JSON(400, map[string]string{"error": "应用ID不能为空"})
		return
	}

	// 权限校验：仅管理员可选择默认位置
	if installTarget == "local" && (ctx.Doer == nil || !ctx.Doer.IsAdmin) {
		ctx.JSON(403, map[string]string{"error": "仅管理员可选择默认位置"})
		return
	}

	// 创建 manager 并执行安装
	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	if err := manager.InstallApp(appID, configJSON, installTarget, k8sURL, token); err != nil {
		// 根据错误类型返回相应的状态码和消息
		if appErr, ok := err.(*appstore.AppStoreError); ok {
			switch appErr.Code {
			case "APP_NOT_FOUND", "CONFIG_MERGE_ERROR":
				ctx.JSON(400, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "KUBERNETES_INSTALL_ERROR":
				ctx.JSON(500, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "NOT_IMPLEMENTED":
				ctx.JSON(501, map[string]string{"error": appErr.Message})
			default:
				ctx.JSON(500, map[string]string{"error": appErr.Message})
			}
		} else {
			ctx.JSON(500, map[string]string{"error": "安装失败: " + err.Error()})
		}
		return
	}

	// 安装成功
	if installTarget == "kubeconfig" && k8sURL != "" && token != "" {
		ctx.Flash.Success("应用已成功安装到自定义位置")
	} else {
		ctx.Flash.Success("应用已成功安装到默认位置")
	}

	// 优先根据表单的 redirect_to 回跳（前端会带上当前路径）
	if redirectTo := ctx.FormString("redirect_to"); redirectTo != "" {
		ctx.RedirectToCurrentSite(redirectTo)
	} else {
		ctx.Redirect(setting.AppSubURL + "/user/settings/appstore")
	}
}

// AppStoreUpdate handles app update
func AppStoreUpdate(ctx *context.Context) {
	// 检查用户登录状态
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	if ctx.Req.Method != "POST" {
		ctx.JSON(405, map[string]string{"error": "Method Not Allowed"})
		return
	}

	// 解析表单数据
	appID := ctx.FormString("app_id")
	configJSON := ctx.FormString("config")
	installTarget := ctx.FormString("install_target")
	k8sURL := ctx.FormString("k8s_url")
	token := ctx.FormString("k8s_token")

	if appID == "" {
		ctx.JSON(400, map[string]string{"error": "应用ID不能为空"})
		return
	}

	// 权限校验：仅管理员可选择默认位置
	if installTarget == "local" && (ctx.Doer == nil || !ctx.Doer.IsAdmin) {
		ctx.JSON(403, map[string]string{"error": "仅管理员可选择默认位置"})
		return
	}

	// 创建 manager 并执行更新
	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	if err := manager.UpdateInstalledApp(appID, configJSON, installTarget, k8sURL, token); err != nil {
		// 根据错误类型返回相应的状态码和消息
		if appErr, ok := err.(*appstore.AppStoreError); ok {
			switch appErr.Code {
			case "APP_NOT_FOUND", "CONFIG_MERGE_ERROR":
				ctx.JSON(400, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "KUBERNETES_UPDATE_ERROR":
				ctx.JSON(500, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "NOT_IMPLEMENTED":
				ctx.JSON(501, map[string]string{"error": appErr.Message})
			default:
				ctx.JSON(500, map[string]string{"error": appErr.Message})
			}
		} else {
			ctx.JSON(500, map[string]string{"error": "更新失败: " + err.Error()})
		}
		return
	}

	// 更新成功
	if installTarget == "kubeconfig" && k8sURL != "" && token != "" {
		ctx.Flash.Success("应用已成功更新到自定义位置")
	} else {
		ctx.Flash.Success("应用已成功更新到默认位置")
	}

	// 优先根据表单的 redirect_to 回跳（前端会带上当前路径）
	if redirectTo := ctx.FormString("redirect_to"); redirectTo != "" {
		ctx.RedirectToCurrentSite(redirectTo)
	} else {
		ctx.Redirect(setting.AppSubURL + "/user/settings/appstore")
	}
}

// AppStoreUninstall handles app uninstallation
func AppStoreUninstall(ctx *context.Context) {
	// 检查用户登录状态
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	if ctx.Req.Method != "POST" {
		ctx.JSON(405, map[string]string{"error": "Method Not Allowed"})
		return
	}

	// 解析表单数据
	appID := ctx.FormString("app_id")

	if appID == "" {
		ctx.JSON(400, map[string]string{"error": "应用ID不能为空"})
		return
	}

	// 创建 manager 并执行卸载
	// UninstallApp 会自动从数据库读取保存的 Kubernetes 凭据判断是外部集群还是本地集群
	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	if err := manager.UninstallApp(appID); err != nil {
		// 根据错误类型返回相应的状态码和消息
		if appErr, ok := err.(*appstore.AppStoreError); ok {
			switch appErr.Code {
			case "APP_NOT_FOUND":
				ctx.JSON(400, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "KUBERNETES_UNINSTALL_ERROR":
				ctx.JSON(500, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "NOT_IMPLEMENTED":
				ctx.JSON(501, map[string]string{"error": appErr.Message})
			default:
				ctx.JSON(500, map[string]string{"error": appErr.Message})
			}
		} else {
			ctx.JSON(500, map[string]string{"error": "卸载失败: " + err.Error()})
		}
		return
	}

	// 卸载成功
	ctx.Flash.Success("应用已成功卸载")

	// 根据来源页面决定重定向位置
	referer := ctx.Req.Header.Get("Referer")
	if strings.Contains(referer, "/admin/appstore") {
		ctx.Redirect(setting.AppSubURL + "/admin/appstore")
	} else {
		ctx.Redirect(setting.AppSubURL + "/user/settings/appstore")
	}
}

// AppStoreResume handles app resuming (restoring original replica count)
func AppStoreResume(ctx *context.Context) {
	// 检查用户登录状态
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	if ctx.Req.Method != "POST" {
		ctx.JSON(405, map[string]string{"error": "Method Not Allowed"})
		return
	}

	// 解析表单数据
	appID := ctx.FormString("app_id")
	installTarget := ctx.FormString("install_target")
	k8sURL := ctx.FormString("k8s_url")
	token := ctx.FormString("k8s_token")

	if appID == "" {
		ctx.JSON(400, map[string]string{"error": "应用ID不能为空"})
		return
	}

	// 创建 manager 并执行恢复
	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	if err := manager.ResumeApp(appID, installTarget, k8sURL, token); err != nil {
		// 根据错误类型返回相应的状态码和消息
		if appErr, ok := err.(*appstore.AppStoreError); ok {
			switch appErr.Code {
			case "APP_NOT_FOUND":
				ctx.JSON(400, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "KUBERNETES_RESUME_ERROR":
				ctx.JSON(500, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "UNSUPPORTED_DEPLOYMENT_TYPE":
				ctx.JSON(400, map[string]string{"error": appErr.Message})
			default:
				ctx.JSON(500, map[string]string{"error": appErr.Message})
			}
		} else {
			ctx.JSON(500, map[string]string{"error": "恢复失败: " + err.Error()})
		}
		return
	}

	// 恢复成功
	if installTarget == "kubeconfig" && k8sURL != "" && token != "" {
		ctx.Flash.Success("应用已成功在指定位置恢复")
	} else {
		ctx.Flash.Success("应用已成功恢复")
	}

	// 根据来源页面决定重定向位置
	referer := ctx.Req.Header.Get("Referer")
	if strings.Contains(referer, "/admin/appstore") {
		ctx.Redirect(setting.AppSubURL + "/admin/appstore")
	} else {
		ctx.Redirect(setting.AppSubURL + "/user/settings/appstore")
	}
}

// AppStoreStop handles app stopping (setting replicas to 0)
func AppStoreStop(ctx *context.Context) {
	// 检查用户登录状态
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	if ctx.Req.Method != "POST" {
		ctx.JSON(405, map[string]string{"error": "Method Not Allowed"})
		return
	}

	// 解析表单数据
	appID := ctx.FormString("app_id")
	installTarget := ctx.FormString("install_target")
	k8sURL := ctx.FormString("k8s_url")
	token := ctx.FormString("k8s_token")

	if appID == "" {
		ctx.JSON(400, map[string]string{"error": "应用ID不能为空"})
		return
	}

	// 创建 manager 并执行暂停
	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	if err := manager.StopApp(appID, installTarget, k8sURL, token); err != nil {
		// 根据错误类型返回相应的状态码和消息
		if appErr, ok := err.(*appstore.AppStoreError); ok {
			switch appErr.Code {
			case "APP_NOT_FOUND":
				ctx.JSON(400, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "KUBERNETES_STOP_ERROR":
				ctx.JSON(500, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "UNSUPPORTED_DEPLOYMENT_TYPE":
				ctx.JSON(400, map[string]string{"error": appErr.Message})
			default:
				ctx.JSON(500, map[string]string{"error": appErr.Message})
			}
		} else {
			ctx.JSON(500, map[string]string{"error": "暂停失败: " + err.Error()})
		}
		return
	}

	// 暂停成功
	if installTarget == "kubeconfig" && k8sURL != "" && token != "" {
		ctx.Flash.Success("应用已成功在指定位置暂停")
	} else {
		ctx.Flash.Success("应用已成功暂停")
	}

	// 根据来源页面决定重定向位置
	referer := ctx.Req.Header.Get("Referer")
	if strings.Contains(referer, "/admin/appstore") {
		ctx.Redirect(setting.AppSubURL + "/admin/appstore")
	} else {
		ctx.Redirect(setting.AppSubURL + "/user/settings/appstore")
	}
}

// AppStoreConfigure handles app configuration
func AppStoreConfigure(ctx *context.Context) {
	// TODO: Load app configuration form
	ctx.Data["Title"] = "App Configuration"
	ctx.Data["PageIsSettingsAppStore"] = true
	ctx.Data["UserDisabledFeatures"] = user_model.DisabledFeaturesWithLoginType(ctx.Doer)
	ctx.HTML(http.StatusOK, tplSettingsAppStore)
}

// AppStoreConfigurePost handles app configuration form submission
func AppStoreConfigurePost(ctx *context.Context) {
	// 检查用户登录状态
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	// TODO: Handle configuration form submission
	ctx.Flash.Success("App configuration feature coming soon")
	if redirectTo := ctx.FormString("redirect_to"); redirectTo != "" {
		ctx.RedirectToCurrentSite(redirectTo)
	} else {
		ctx.Redirect(setting.AppSubURL + "/user/settings/appstore")
	}
}

// 添加应用API
func AddAppAPI(ctx *context.Context) {
	// 检查 CSRF token
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	if ctx.Req.Method != "POST" {
		ctx.JSON(405, map[string]string{"error": "Method Not Allowed"})
		return
	}
	defer ctx.Req.Body.Close()
	jsonBytes, err := io.ReadAll(ctx.Req.Body)
	if err != nil {
		ctx.JSON(400, map[string]string{"error": "读取请求体失败"})
		return
	}
	if err := manager.AddAppFromJSON(jsonBytes); err != nil {
		ctx.JSON(400, map[string]string{"error": err.Error()})
		return
	}
	ctx.JSON(200, map[string]string{"msg": "ok"})
}

// AppStoreDelete handles app deletion from database
func AppStoreDelete(ctx *context.Context) {
	// 检查用户登录状态
	if !ctx.IsSigned {
		ctx.JSON(401, map[string]string{"error": "未登录"})
		return
	}

	if ctx.Req.Method != "POST" {
		ctx.JSON(405, map[string]string{"error": "Method Not Allowed"})
		return
	}

	// 从路径参数获取应用ID
	appID := ctx.PathParam("app_id")

	if appID == "" {
		ctx.JSON(400, map[string]string{"error": "应用ID不能为空"})
		return
	}

	// 创建 manager 并执行删除
	manager := appstore.NewManager(ctx, ctx.Doer.ID)
	if err := manager.RemoveApp(appID); err != nil {
		// 根据错误类型返回相应的状态码和消息
		if appErr, ok := err.(*appstore.AppStoreError); ok {
			switch appErr.Code {
			case "APP_NOT_FOUND":
				ctx.JSON(400, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			case "DATABASE_ERROR":
				ctx.JSON(500, map[string]string{"error": appErr.Message + ": " + appErr.Details})
			default:
				ctx.JSON(500, map[string]string{"error": appErr.Message})
			}
		} else {
			ctx.JSON(500, map[string]string{"error": "删除失败: " + err.Error()})
		}
		return
	}

	// 删除成功
	ctx.Flash.Success("应用已成功删除")

	// 根据来源页面决定重定向位置
	referer := ctx.Req.Header.Get("Referer")
	if strings.Contains(referer, "/admin/appstore") {
		ctx.Redirect(setting.AppSubURL + "/admin/appstore")
	} else {
		ctx.Redirect(setting.AppSubURL + "/user/settings/appstore")
	}
}