package handlers

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"strconv"

	"super-frpc/config"
	"super-frpc/database"
	"super-frpc/utils"
	"super-frpc/postLog"

	"github.com/BurntSushi/toml"
)

func CreateProxyHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := utils.Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		utils.SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[CreateProxyHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[CreateProxyHandler] Failed to read request body: %v", err))
		utils.SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[CreateProxyHandler] Failed to unmarshal request body: %v", err))
		utils.SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceID := getStringFromMap(reqMap, "instanceID")
	if instanceID == "" {
		postLog.Error("[CreateProxyHandler] instanceID is required")
		utils.SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	proxyInfoMap, ok := reqMap["proxyInfo"].(map[string]interface{})
	if !ok {
		postLog.Error("[CreateProxyHandler] Invalid proxyInfo format")
		utils.SendErrorResponse(w, http.StatusBadRequest, "Invalid proxyInfo format")
		return
	}

	proxyInfo := config.FrpcProxyInfo{
		Name:       getStringFromMap(proxyInfoMap, "name"),
		Type:       getStringFromMap(proxyInfoMap, "type"),
		LocalIP:    getStringFromMap(proxyInfoMap, "localIP"),
		LocalPort:  getNumFromMap(proxyInfoMap, "localPort"),
		RemotePort: getNumFromMap(proxyInfoMap, "remotePort"),
	}

	if proxyInfo.Name == "" || proxyInfo.Type == "" || proxyInfo.LocalIP == "" ||
		proxyInfo.LocalPort == 0 || proxyInfo.RemotePort == 0 {
		postLog.Error("[CreateProxyHandler] Missing required fields in proxyInfo")
		utils.SendErrorResponse(w, http.StatusBadRequest, "Missing required fields in proxyInfo")
		return
	}

	var instance database.FrpcInstance
	instanceIDInt, _ := strconv.Atoi(instanceID)
	instance, err = database.DBQueryFrpcInstanceByID(instanceIDInt)
	if err != nil {
		postLog.Error(fmt.Sprintf("[CreateProxyHandler] Failed to query instance: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		postLog.Error(fmt.Sprintf("[CreateProxyHandler] Instance not found for user %d", userID))
		utils.SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		return
	}

	configContent, err := os.ReadFile(instance.ConfigPath)
	if err != nil {
		postLog.Error(fmt.Sprintf("[CreateProxyHandler] Failed to read config file %s: %v", instance.ConfigPath, err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to read config file")
		return
	}

	updatedContent, err := config.AddFrpcProxy(string(configContent), proxyInfo)
	if err != nil {
		postLog.Error(fmt.Sprintf("[CreateProxyHandler] Failed to add proxy: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to add proxy")
		return
	}

	if err := os.WriteFile(instance.ConfigPath, []byte(updatedContent), 0644); err != nil {
		postLog.Error(fmt.Sprintf("[CreateProxyHandler] Failed to write config file %s: %v", instance.ConfigPath, err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to write config file")
		return
	}

	utils.SendSuccessResponse(w, "Proxy created successfully", map[string]interface{}{
		"instanceID": instance.ID,
		"configPath": instance.ConfigPath,
		"proxyName":  proxyInfo.Name,
	})
	postLog.Info(fmt.Sprintf("[CreateProxyHandler] Proxy %s created successfully for instance %d", proxyInfo.Name, instance.ID))
}

func ModifyProxyHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := utils.Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		utils.SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[ModifyProxyHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ModifyProxyHandler] Failed to read request body: %v", err))
		utils.SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[ModifyProxyHandler] Failed to unmarshal request body: %v", err))
		utils.SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceID := getStringFromMap(reqMap, "instanceID")
	if instanceID == "" {
		postLog.Error("[ModifyProxyHandler] instanceID is required")
		utils.SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	proxyInfoMap, ok := reqMap["proxyInfo"].(map[string]interface{})
	if !ok {
		postLog.Error("[ModifyProxyHandler] Invalid proxyInfo format")
		utils.SendErrorResponse(w, http.StatusBadRequest, "Invalid proxyInfo format")
		return
	}

	proxyInfo := config.FrpcProxyInfo{
		Name:       getStringFromMap(proxyInfoMap, "name"),
		Type:       getStringFromMap(proxyInfoMap, "type"),
		LocalIP:    getStringFromMap(proxyInfoMap, "localIP"),
		LocalPort:  getNumFromMap(proxyInfoMap, "localPort"),
		RemotePort: getNumFromMap(proxyInfoMap, "remotePort"),
	}

	if proxyInfo.Name == "" || proxyInfo.Type == "" || proxyInfo.LocalIP == "" ||
		proxyInfo.LocalPort == 0 || proxyInfo.RemotePort == 0 {
		postLog.Error("[ModifyProxyHandler] Missing required fields in proxyInfo")
		utils.SendErrorResponse(w, http.StatusBadRequest, "Missing required fields in proxyInfo")
		return
	}

	var instance database.FrpcInstance
	instanceIDInt, _ := strconv.Atoi(instanceID)
	instance, err = database.DBQueryFrpcInstanceByID(instanceIDInt)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ModifyProxyHandler] Failed to query instance: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		postLog.Error(fmt.Sprintf("[ModifyProxyHandler] Instance not found for user %d", userID))
		utils.SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		return
	}

	configContent, err := os.ReadFile(instance.ConfigPath)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ModifyProxyHandler] Failed to read config file %s: %v", instance.ConfigPath, err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to read config file")
		return
	}

	updatedContent, err := config.ModifyFrpcProxy(string(configContent), proxyInfo)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ModifyProxyHandler] Failed to modify proxy: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to modify proxy")
		return
	}

	if err := os.WriteFile(instance.ConfigPath, []byte(updatedContent), 0644); err != nil {
		postLog.Error(fmt.Sprintf("[ModifyProxyHandler] Failed to write config file %s: %v", instance.ConfigPath, err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to write config file")
		return
	}

	utils.SendSuccessResponse(w, "Proxy modified successfully", map[string]interface{}{
		"instanceID": instance.ID,
		"configPath": instance.ConfigPath,
		"proxyName":  proxyInfo.Name,
	})
	postLog.Info(fmt.Sprintf("[ModifyProxyHandler] Proxy %s modified successfully for instance %d", proxyInfo.Name, instance.ID))
}

func DeleteProxyHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := utils.Auth(w, r, http.MethodPost, "superuser", "admin")
	if err != nil {
		utils.SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[DeleteProxyHandler] Auth failed: %v", err))
		return
	}

	body, err := io.ReadAll(r.Body)
	if err != nil {
		postLog.Error(fmt.Sprintf("[DeleteProxyHandler] Failed to read request body: %v", err))
		utils.SendErrorResponse(w, http.StatusBadRequest, "Failed to read request body")
		return
	}
	defer r.Body.Close()

	var reqMap map[string]interface{}
	if err := json.Unmarshal(body, &reqMap); err != nil {
		postLog.Error(fmt.Sprintf("[DeleteProxyHandler] Failed to unmarshal request body: %v", err))
		utils.SendErrorResponse(w, http.StatusBadRequest, "Invalid request format")
		return
	}

	instanceID := getStringFromMap(reqMap, "instanceID")
	if instanceID == "" {
		postLog.Error("[DeleteProxyHandler] instanceID is required")
		utils.SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	proxyName := getStringFromMap(reqMap, "proxyName")
	if proxyName == "" {
		postLog.Error("[DeleteProxyHandler] proxyName is required")
		utils.SendErrorResponse(w, http.StatusBadRequest, "proxyName is required")
		return
	}

	var instance database.FrpcInstance
	instanceIDInt, _ := strconv.Atoi(instanceID)
	instance, err = database.DBQueryFrpcInstanceByID(instanceIDInt)
	if err != nil {
		postLog.Error(fmt.Sprintf("[DeleteProxyHandler] Failed to query instance: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		postLog.Error(fmt.Sprintf("[DeleteProxyHandler] Instance not found for user %d", userID))
		utils.SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		return
	}

	configContent, err := os.ReadFile(instance.ConfigPath)
	if err != nil {
		postLog.Error(fmt.Sprintf("[DeleteProxyHandler] Failed to read config file %s: %v", instance.ConfigPath, err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to read config file")
		return
	}

	updatedContent, err := config.RemoveFrpcProxy(string(configContent), proxyName)
	if err != nil {
		postLog.Error(fmt.Sprintf("[DeleteProxyHandler] Failed to remove proxy: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to remove proxy")
		return
	}

	if err := os.WriteFile(instance.ConfigPath, []byte(updatedContent), 0644); err != nil {
		postLog.Error(fmt.Sprintf("[DeleteProxyHandler] Failed to write config file %s: %v", instance.ConfigPath, err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to write config file")
		return
	}

	utils.SendSuccessResponse(w, "Proxy deleted successfully", map[string]interface{}{
		"instanceID": instance.ID,
		"configPath": instance.ConfigPath,
		"proxyName":  proxyName,
	})
	postLog.Info(fmt.Sprintf("[DeleteProxyHandler] Proxy %s deleted successfully from instance %d", proxyName, instance.ID))
}

func ListProxiesHandler(w http.ResponseWriter, r *http.Request) {
	userID, err := utils.Auth(w, r, http.MethodGet)
	if err != nil {
		utils.SendErrorResponse(w, http.StatusUnauthorized, err.Error())
		postLog.Warning(fmt.Sprintf("[ListProxiesHandler] Auth failed: %v", err))
		return
	}

	queryParams := r.URL.Query()
	instanceID := queryParams.Get("instanceID")
	if instanceID == "" {
		postLog.Error("[ListProxiesHandler] instanceID is required")
		utils.SendErrorResponse(w, http.StatusBadRequest, "instanceID is required")
		return
	}

	var instance database.FrpcInstance
	instanceIDInt, _ := strconv.Atoi(instanceID)
	instance, err = database.DBQueryFrpcInstanceByID(instanceIDInt)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ListProxiesHandler] Failed to query instance: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to query instance")
		return
	}

	if instance.UserID != userID {
		postLog.Error(fmt.Sprintf("[ListProxiesHandler] Instance not found for user %d", userID))
		utils.SendErrorResponse(w, http.StatusNotFound, "Instance not found")
		return
	}

	configContent, err := os.ReadFile(instance.ConfigPath)
	if err != nil {
		postLog.Error(fmt.Sprintf("[ListProxiesHandler] Failed to read config file %s: %v", instance.ConfigPath, err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to read config file")
		return
	}

	var cfg config.FrpcConfig
	if _, err := toml.Decode(string(configContent), &cfg); err != nil {
		postLog.Error(fmt.Sprintf("[ListProxiesHandler] Failed to parse config: %v", err))
		utils.SendErrorResponse(w, http.StatusInternalServerError, "Failed to parse config file")
		return
	}

	proxyList := make([]map[string]interface{}, len(cfg.Proxies))
	for i, proxy := range cfg.Proxies {
		proxyData := map[string]interface{}{
			"name":       proxy["name"],
			"type":       proxy["type"],
			"localIP":    proxy["localIP"],
			"localPort":  proxy["localPort"],
			"remotePort": proxy["remotePort"],
		}
		proxyList[i] = proxyData
	}

	utils.SendSuccessResponse(w, "Proxies listed successfully", map[string]interface{}{
		"instanceID": instance.ID,
		"proxyCount": len(proxyList),
		"proxies":    proxyList,
	})
	postLog.Info(fmt.Sprintf("[ListProxiesHandler] Retrieved %d proxies for instance %d", len(proxyList), instance.ID))
}