/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

package proxmox

import (
	"errors"
	"fmt"
	"net/url"
	"sort"
	"strings"
	"time"

	"golang.org/x/crypto/ssh"
)

// ExecuteNodeCommands executes commands on a given node.
func (c *VirtualEnvironmentClient) ExecuteNodeCommands(nodeName string, commands []string) error {
	sshClient, err := c.OpenNodeShell(nodeName)

	if err != nil {
		return err
	}

	defer sshClient.Close()

	sshSession, err := sshClient.NewSession()

	if err != nil {
		return err
	}

	defer sshSession.Close()

	output, err := sshSession.CombinedOutput(
		fmt.Sprintf(
			"/bin/bash -c '%s'",
			strings.ReplaceAll(strings.Join(commands, " && \\\n"), "'", "'\"'\"'"),
		),
	)

	if err != nil {
		return errors.New(string(output))
	}

	return nil
}

// GetNodeIP retrieves the IP address of a node.
func (c *VirtualEnvironmentClient) GetNodeIP(nodeName string) (*string, error) {
	networkDevices, err := c.ListNodeNetworkDevices(nodeName)

	if err != nil {
		return nil, err
	}

	nodeAddress := ""

	for _, d := range networkDevices {
		if d.Address != nil {
			nodeAddress = *d.Address
			break
		}
	}

	if nodeAddress == "" {
		return nil, fmt.Errorf("Failed to determine the IP address of node \"%s\"", nodeName)
	}

	nodeAddressParts := strings.Split(nodeAddress, "/")

	return &nodeAddressParts[0], nil
}

// GetNodeTime retrieves the time information for a node.
func (c *VirtualEnvironmentClient) GetNodeTime(nodeName string) (*VirtualEnvironmentNodeGetTimeResponseData, error) {
	resBody := &VirtualEnvironmentNodeGetTimeResponseBody{}
	err := c.DoRequest(hmGET, fmt.Sprintf("nodes/%s/time", url.PathEscape(nodeName)), nil, resBody)

	if err != nil {
		return nil, err
	}

	if resBody.Data == nil {
		return nil, errors.New("The server did not include a data object in the response")
	}

	return resBody.Data, nil
}

// GetNodeTaskStatus retrieves the status of a node task.
func (c *VirtualEnvironmentClient) GetNodeTaskStatus(nodeName string, upid string) (*VirtualEnvironmentNodeGetTaskStatusResponseData, error) {
	resBody := &VirtualEnvironmentNodeGetTaskStatusResponseBody{}
	err := c.DoRequest(hmGET, fmt.Sprintf("nodes/%s/tasks/%s/status", url.PathEscape(nodeName), url.PathEscape(upid)), nil, resBody)

	if err != nil {
		return nil, err
	}

	if resBody.Data == nil {
		return nil, errors.New("The server did not include a data object in the response")
	}

	return resBody.Data, nil
}

// ListNodeNetworkDevices retrieves a list of network devices for a specific nodes.
func (c *VirtualEnvironmentClient) ListNodeNetworkDevices(nodeName string) ([]*VirtualEnvironmentNodeNetworkDeviceListResponseData, error) {
	resBody := &VirtualEnvironmentNodeNetworkDeviceListResponseBody{}
	err := c.DoRequest(hmGET, fmt.Sprintf("nodes/%s/network", url.PathEscape(nodeName)), nil, resBody)

	if err != nil {
		return nil, err
	}

	if resBody.Data == nil {
		return nil, errors.New("The server did not include a data object in the response")
	}

	sort.Slice(resBody.Data, func(i, j int) bool {
		return resBody.Data[i].Priority < resBody.Data[j].Priority
	})

	return resBody.Data, nil
}

// ListNodes retrieves a list of nodes.
func (c *VirtualEnvironmentClient) ListNodes() ([]*VirtualEnvironmentNodeListResponseData, error) {
	resBody := &VirtualEnvironmentNodeListResponseBody{}
	err := c.DoRequest(hmGET, "nodes", nil, resBody)

	if err != nil {
		return nil, err
	}

	if resBody.Data == nil {
		return nil, errors.New("The server did not include a data object in the response")
	}

	sort.Slice(resBody.Data, func(i, j int) bool {
		return resBody.Data[i].Name < resBody.Data[j].Name
	})

	return resBody.Data, nil
}

// OpenNodeShell establishes a new SSH connection to a node.
func (c *VirtualEnvironmentClient) OpenNodeShell(nodeName string) (*ssh.Client, error) {
	nodeAddress, err := c.GetNodeIP(nodeName)

	if err != nil {
		return nil, err
	}

	ur := strings.Split(c.Username, "@")

	sshConfig := &ssh.ClientConfig{
		User:            ur[0],
		Auth:            []ssh.AuthMethod{ssh.Password(c.Password)},
		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
	}

	sshClient, err := ssh.Dial("tcp", *nodeAddress+":22", sshConfig)

	if err != nil {
		return nil, err
	}

	return sshClient, nil
}

// UpdateNodeTime updates the time on a node.
func (c *VirtualEnvironmentClient) UpdateNodeTime(nodeName string, d *VirtualEnvironmentNodeUpdateTimeRequestBody) error {
	return c.DoRequest(hmPUT, fmt.Sprintf("nodes/%s/time", url.PathEscape(nodeName)), d, nil)
}

// WaitForNodeTask waits for a specific node task to complete.
func (c *VirtualEnvironmentClient) WaitForNodeTask(nodeName string, upid string, timeout int, delay int) error {
	timeDelay := int64(delay)
	timeMax := float64(timeout)
	timeStart := time.Now()
	timeElapsed := timeStart.Sub(timeStart)

	for timeElapsed.Seconds() < timeMax {
		if int64(timeElapsed.Seconds())%timeDelay == 0 {
			status, err := c.GetNodeTaskStatus(nodeName, upid)

			if err != nil {
				return err
			}

			if status.Status != "running" {
				if status.ExitCode != "OK" {
					return fmt.Errorf("Task \"%s\" on node \"%s\" failed to complete with error: %s", upid, nodeName, status.ExitCode)
				}
				return nil
			}

			time.Sleep(1 * time.Second)
		}

		time.Sleep(200 * time.Millisecond)

		timeElapsed = time.Now().Sub(timeStart)
	}

	return fmt.Errorf("Timeout while waiting for task \"%s\" on node \"%s\" to complete", upid, nodeName)
}