package main

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"

	"hnyfkj.com.cn/rtu/linux/baseapp"
)

const maxUploadSize = 1 << 30 // 1GB

func downloadAppInstallLog(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	filename := fmt.Sprintf("app-install.log.%s.tar.gz", time.Now().Format("20060102150405"))
	tmpFile := fmt.Sprintf("/tmp/%d.tar.gz", time.Now().UnixNano())

	defer os.Remove(tmpFile)

	cmd := exec.Command(
		"tar",
		"--warning=no-file-changed",
		"-czf",
		tmpFile,
		"-C",
		"/opt/yfkj/app-install.service/log",
		".",
	)

	out, err := cmd.CombinedOutput()
	if err != nil {
		if exitErr, ok := err.(*exec.ExitError); !ok || exitErr.ExitCode() != 1 {
			http.Error(w, string(out), http.StatusInternalServerError)
			return
		}
	}

	w.Header().Set("Content-Type", "application/gzip")
	w.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, filename))

	http.ServeFile(w, r, tmpFile)
}

func restartAppInstallService(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	cmd := exec.Command("systemctl", "restart", "yfkj-app-install.service")

	if out, err := cmd.CombinedOutput(); err != nil {
		http.Error(w, string(out)+err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.Write([]byte(`{"status":"ok"}`))
}

func getUserAppStatus() (string, string) {
	status := noValue
	pid := noValue

	out, err := exec.Command("systemctl", "show", "yfkj-user-app.service",
		"-p", "LoadState",
		"-p", "ActiveState",
		"-p", "SubState",
		"-p", "MainPID").Output()
	if err != nil {
		return status, pid
	}

	v := string(out)
	switch {
	case strings.Contains(v, "ActiveState=active") &&
		strings.Contains(v, "SubState=running"):
		status = "🟢运行中"

	case strings.Contains(v, "ActiveState=active") &&
		strings.Contains(v, "SubState=exited"):
		status = "🔵已完成"

	case strings.Contains(v, "LoadState=loaded") &&
		strings.Contains(v, "ActiveState=inactive"):
		status = "🟡已停止"
	}

	for _, line := range strings.Split(v, "\n") {
		if after, ok := strings.CutPrefix(line, "MainPID="); ok {
			if after != "" && after != "0" {
				pid = after
			}
			break
		}
	}

	return status, pid
}

func appInstallStatusHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	var info *struct {
		Pkg struct {
			FileName   string `json:"fileName"`
			FileSize   int64  `json:"fileSize"`
			FileMD5    string `json:"fileMD5"`
			UploadTime string `json:"uploadTime"`
		} `json:"pkg"`
		App struct {
			Name        string `json:"name"`
			Version     string `json:"version"`
			Executable  string `json:"executable"`
			Description string `json:"description"`
			ReadmeFile  string `json:"readmeFile"`
		} `json:"app"`
		Ins struct {
			Installed   bool   `json:"installed"`
			InstallTime string `json:"installTime"`
		} `json:"ins"`
	}

	callErr := callRPCResult(r.Context(), 7004, "core.getInstallInfo", nil, &info)

	data := map[string]string{
		"state": "0",
		"avar1": noValue,
		"avar2": noValue,
		"avar3": noValue,
		"avar4": noValue,
		"bvar1": noValue,
		"bvar2": noValue,
		"bvar3": noValue,
		"bvar4": noValue,
		"bvar5": noValue,
		"cvar1": noValue,
		"cvar2": noValue,
		"cvar3": noValue,
		"cvar4": noValue,
		"cvar5": noValue,
	}

	if callErr == nil {
		data["avar1"] = "🟢正常"

		if info != nil {
			data["bvar1"] = info.Pkg.FileName
			data["bvar2"] = fmt.Sprintf("%d 字节", info.Pkg.FileSize)
			data["bvar3"] = info.Pkg.FileMD5
			data["bvar4"] = info.Pkg.UploadTime

			data["cvar1"] = info.App.Name
			data["cvar2"] = info.App.Version
			data["cvar3"] = info.App.Executable
			data["cvar4"] = info.Ins.InstallTime
			data["cvar5"] = info.App.ReadmeFile

			if info.Ins.Installed {
				data["state"] = "2"
				data["avar2"] = info.App.Name
				data["avar3"], data["avar4"] = getUserAppStatus()
				data["bvar5"] = "已安装"
			} else {
				data["state"] = "1"
				data["bvar5"] = "未安装"
			}
		}
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	json.NewEncoder(w).Encode(data)
}

func uploadUserAppPkg(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	r.Body = http.MaxBytesReader(w, r.Body, maxUploadSize)

	mr, err := r.MultipartReader()
	if err != nil {
		http.Error(w, "解析上传请求失败: "+err.Error(), http.StatusBadRequest)
		return
	}

	for {
		part, err := mr.NextPart()
		if err == io.EOF {
			break
		}

		if err != nil {
			http.Error(w, "读取上传数据失败: "+err.Error(), http.StatusBadRequest)
			return
		}

		if part.FormName() != "file" {
			part.Close()
			continue
		}

		filename := filepath.Base(part.FileName())
		if filename == "" || filename == "." {
			part.Close()
			http.Error(w, "文件名为空", http.StatusBadRequest)
			return
		}

		if !strings.HasSuffix(strings.ToLower(filename), ".tar.gz") {
			part.Close()
			http.Error(w, "只允许上传 tar.gz 类型的文件", http.StatusBadRequest)
			return
		}

		path := filepath.Join("/tmp", filename)

		err = saveUploadFile(part, path)
		part.Close()

		if err != nil {
			http.Error(w, "保存上传文件失败: "+err.Error(), http.StatusInternalServerError)
			return
		}

		size := int64(0)
		if stat, err := os.Stat(path); err == nil {
			size = stat.Size()
		}

		baseapp.Logger.Infof(
			"[上传文件成功] 上传文件名: %s, 上传文件大小: %d 字节, 本地存储路径: %s",
			filename, size, path)

		break
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	json.NewEncoder(w).Encode(map[string]string{"result": "success"})
}

func saveUploadFile(src io.Reader, path string) error {
	dst, err := os.Create(path)
	if err != nil {
		return err
	}
	defer dst.Close()

	_, err = io.Copy(dst, src)
	if err != nil {
		os.Remove(path)
		return err
	}

	return nil
}

func appPkgImportHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	var params struct {
		File string `json:"file"`
	}

	if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	if params.File == "" {
		http.Error(w, "missing file", http.StatusBadRequest)
		return
	}

	callErr := callRPCResult(r.Context(), 7004, "core.package.import",
		map[string]string{"file": params.File}, nil)
	if callErr != nil {
		http.Error(w, callErr.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	json.NewEncoder(w).Encode(map[string]string{"result": "success"})
}

func appPkgRemoveHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	callErr := callRPCResult(r.Context(), 7004, "core.package.remove", nil, nil)
	if callErr != nil {
		http.Error(w, callErr.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	json.NewEncoder(w).Encode(map[string]string{"result": "success"})
}

func appInstallHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	callErr := callRPCResult(r.Context(), 7004, "core.app.install", nil, nil)
	if callErr != nil {
		http.Error(w, callErr.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	json.NewEncoder(w).Encode(map[string]string{"result": "success"})
}

func appUninstallHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	callErr := callRPCResult(r.Context(), 7004, "core.app.uninstall", nil, nil)
	if callErr != nil {
		http.Error(w, callErr.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	json.NewEncoder(w).Encode(map[string]string{"result": "success"})
}

func restartUserAppService(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	cmd := exec.Command("systemctl", "restart", "yfkj-user-app.service")

	if out, err := cmd.CombinedOutput(); err != nil {
		http.Error(w, string(out)+err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.Write([]byte(`{"status":"ok"}`))
}

var userAppPkgDir = "/opt/yfkj/app-install.service/user-app-pkg"

func downloadUserAppPkg(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	var info struct {
		Pkg struct {
			FileName string `json:"fileName"`
		} `json:"pkg"`
	}

	data, err := os.ReadFile(filepath.Join(userAppPkgDir, "appins.json"))
	if err != nil {
		http.Error(w, "用户应用安装包不存在", http.StatusNotFound)
		return
	}

	if err := json.Unmarshal(data, &info); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	if info.Pkg.FileName == "" {
		http.Error(w, "用户应用安装包不存在", http.StatusNotFound)
		return
	}

	filename := filepath.Base(info.Pkg.FileName)
	file := filepath.Join(userAppPkgDir, filename)

	stat, err := os.Stat(file)
	if err != nil || !stat.Mode().IsRegular() {
		http.Error(w, "用户应用安装包不存在", http.StatusNotFound)
		return
	}

	w.Header().Set("Content-Type", "application/gzip")
	w.Header().Set("Content-Disposition",
		fmt.Sprintf(`attachment; filename="%s"`, filename))

	http.ServeFile(w, r, file)
}