// Mgmt
// Copyright (C) James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
// Additional permission under GNU GPL version 3 section 7
//
// If you modify this program, or any covered work, by linking or combining it
// with embedded mcl code and modules (and that the embedded mcl code and
// modules which link with this program, contain a copy of their source code in
// the authoritative form) containing parts covered by the terms of any other
// license, the licensors of this program grant you additional permission to
// convey the resulting work. Furthermore, the licensors of this program grant
// the original author, James Shubin, additional permission to update this
// additional permission if he deems it necessary to achieve the goals of this
// additional permission.

package main

import (
	"context"
	_ "embed"
	"fmt"
	"log"
	"os"

	"github.com/purpleidea/mgmt/cli"
	cliUtil "github.com/purpleidea/mgmt/cli/util"
	"github.com/purpleidea/mgmt/entry"
	_ "github.com/purpleidea/mgmt/gapi/empty" // import so the gapi registers
	_ "github.com/purpleidea/mgmt/lang/gapi"  // import so the gapi registers
	"github.com/purpleidea/mgmt/util"
	"github.com/purpleidea/mgmt/util/pprof"
	_ "github.com/purpleidea/mgmt/yamlgraph" // import so the gapi registers
	"go.etcd.io/etcd/server/v3/etcdmain"
)

// These constants are some global variables that are used throughout the code.
const (
	tagline = "next generation config management"
	debug   = false // add additional log messages
)

// set at compile time
var (
	program string
	version string
)

//go:embed COPYING
var copying string

func main() {
	// embed etcd completely
	if len(os.Args) >= 2 && os.Args[1] == "etcd" {
		args := []string{}
		for i, s := range os.Args {
			if i == 0 { // pop off our argv[0] and let `etcd` be it
				continue
			}
			args = append(args, s)
		}
		etcdmain.Main(args) // this will os.Exit
		return              // for safety
	}

	cliUtil.LogSetup(debug)
	data := &cliUtil.Data{
		Program: program,
		Version: version,
		Copying: copying,
		Tagline: tagline,
		Flags: cliUtil.Flags{
			Debug: debug,
			Logf: func(format string, v ...interface{}) {
				log.Printf(format, v...) // the top-level log!
			},
		},
		Args: os.Args,
	}

	// Run profiling if it's activated.
	// TODO: Should we pass a logger into this?
	ctx, cancel := context.WithCancel(context.Background())
	if err := pprof.Run(ctx); err != nil {
		fmt.Println(err) // TODO: let pprof log errors
		os.Exit(util.ExitCode(err))
		//return // redundant
	}
	defer cancel()

	name := ""
	if len(data.Args) > 1 {
		name = data.Args[1]
	}
	// is there an alternate entry point for the cli?
	if cli, err := entry.Lookup(name); err == nil && cli.Name() == name {
		data.Args = data.Args[1:] // pop off "argv[0]"
		if err := cli.CLI(context.Background(), data); err != nil {
			//fmt.Println(err)
			os.Exit(util.ExitCode(err))
			//return // redundant
		}
		return
	}

	if err := cli.CLI(context.Background(), data); err != nil {
		//fmt.Println(err)
		os.Exit(util.ExitCode(err))
		//return // redundant
	}
}
