// Copyright 2023 Harness, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package ide

import (
	"context"
	"fmt"
	"os"
	"strconv"

	"github.com/harness/gitness/app/gitspace/orchestrator/devcontainer"
	"github.com/harness/gitness/app/gitspace/orchestrator/template"
	"github.com/harness/gitness/types"
	"github.com/harness/gitness/types/enum"
)

var _ IDE = (*VSCode)(nil)

const templateSetupSSHServer string = "setup_ssh_server.sh"
const templateRunSSHServer string = "run_ssh_server.sh"

type VSCodeConfig struct {
	Port int
}

type VSCode struct {
	config *VSCodeConfig
}

func NewVsCodeService(config *VSCodeConfig) *VSCode {
	return &VSCode{config: config}
}

// Setup installs the SSH server inside the container.
func (v *VSCode) Setup(
	ctx context.Context,
	exec *devcontainer.Exec,
) ([]byte, error) {
	osInfoScript, err := os.ReadFile("app/gitspace/orchestrator/common/script/os_info.sh")
	if err != nil {
		return nil, fmt.Errorf("failed to read os_info.sh: %w", err)
	}
	sshServerScript, err := template.GenerateScriptFromTemplate(
		templateSetupSSHServer, &template.SetupSSHServerPayload{
			Username:     exec.UserIdentifier,
			AccessType:   exec.AccessType,
			OSInfoScript: string(osInfoScript),
		})
	if err != nil {
		return nil, fmt.Errorf(
			"failed to generate scipt to setup ssh server from template %s: %w", templateSetupSSHServer, err)
	}

	output := "Installing ssh-server inside container\n"

	_, err = exec.ExecuteCommandInHomeDirectory(ctx, sshServerScript, true, false)
	if err != nil {
		return nil, fmt.Errorf("failed to setup SSH serverr: %w", err)
	}

	output += "Successfully installed ssh-server\n"

	return []byte(output), nil
}

// Run runs the SSH server inside the container.
func (v *VSCode) Run(ctx context.Context, exec *devcontainer.Exec) ([]byte, error) {
	var output = ""

	runSSHScript, err := template.GenerateScriptFromTemplate(
		templateRunSSHServer, &template.RunSSHServerPayload{
			Port: strconv.Itoa(v.config.Port),
		})
	if err != nil {
		return nil, fmt.Errorf(
			"failed to generate scipt to run ssh server from template %s: %w", templateRunSSHServer, err)
	}

	execOutput, err := exec.ExecuteCommandInHomeDirectory(ctx, runSSHScript, true, false)
	if err != nil {
		return nil, fmt.Errorf("failed to run SSH serverr: %w", err)
	}

	output += "SSH server run output...\n" + string(execOutput) + "\nSuccessfully run ssh-server\n"

	return []byte(output), nil
}

// Port returns the port on which the ssh-server is listening.
func (v *VSCode) Port() *types.GitspacePort {
	return &types.GitspacePort{
		Port:     v.config.Port,
		Protocol: enum.CommunicationProtocolSSH,
	}
}

func (v *VSCode) Type() enum.IDEType {
	return enum.IDETypeVSCode
}