package main

import (
	"fmt"
	"os"
	"path"
	"strings"

	"github.com/DarthSim/overmind/v2/start"
	"github.com/Envek/godotenv"

	"github.com/urfave/cli"
)

const version = "2.5.1"

func socketFlags(s, n *string) []cli.Flag {
	return []cli.Flag{
		cli.StringFlag{
			Name:        "socket, s",
			EnvVar:      "OVERMIND_SOCKET",
			Usage:       "Path to overmind socket (in case of using unix socket) or address to bind (in other cases)",
			Value:       "./.overmind.sock",
			Destination: s,
		},
		cli.StringFlag{
			Name:        "network, S",
			EnvVar:      "OVERMIND_NETWORK",
			Usage:       "Network to use for commands. Can be 'tcp', 'tcp4', 'tcp6' or 'unix'",
			Value:       "unix",
			Destination: n,
		},
	}
}

func setupStartCmd() cli.Command {
	c := start.Handler{}

	return cli.Command{
		Name:    "start",
		Aliases: []string{"s"},
		Usage:   "Run procfile",
		Action:  c.Run,
		Flags: append(
			[]cli.Flag{
				cli.StringFlag{Name: "title, w", EnvVar: "OVERMIND_TITLE", Usage: "Specify a title of the application", Destination: &c.Title},
				cli.StringFlag{Name: "procfile, f", EnvVar: "OVERMIND_PROCFILE", Usage: "Specify a Procfile to load", Value: "./Procfile", Destination: &c.Procfile},
				cli.StringFlag{Name: "processes, l", EnvVar: "OVERMIND_PROCESSES", Usage: "Specify process names to launch. Divide names with comma", Destination: &c.ProcNames},
				cli.StringFlag{Name: "root, d", Usage: "Specify a working directory of application. Default: directory containing the Procfile", Destination: &c.Root},
				cli.IntFlag{Name: "timeout, t", EnvVar: "OVERMIND_TIMEOUT", Usage: "Specify the amount of time (in seconds) processes have to shut down gracefully before being brutally killed", Value: 5, Destination: &c.Timeout},
				cli.IntFlag{Name: "port, p", EnvVar: "OVERMIND_PORT,PORT", Usage: "Specify a port to use as the base", Value: 5000, Destination: &c.PortBase},
				cli.IntFlag{Name: "port-step, P", EnvVar: "OVERMIND_PORT_STEP", Usage: "Specify a step to increase port number", Value: 100, Destination: &c.PortStep},
				cli.BoolFlag{Name: "no-port, N", EnvVar: "OVERMIND_NO_PORT", Usage: "Don't set $PORT variable for processes", Destination: &c.NoPort},
				cli.StringFlag{Name: "can-die, c", EnvVar: "OVERMIND_CAN_DIE", Usage: "Specify names of process which can die without interrupting the other processes. Divide names with comma", Destination: &c.CanDie},
				cli.BoolFlag{Name: "any-can-die", EnvVar: "OVERMIND_ANY_CAN_DIE", Usage: "No dead processes should stop Overmind. Overrides can-die", Destination: &c.AnyCanDie},
				cli.StringFlag{Name: "auto-restart, r", EnvVar: "OVERMIND_AUTO_RESTART", Usage: "Specify names of process which will be auto restarted on death. Divide names with comma. Use 'all' as a process name to auto restart all processes on death.", Destination: &c.AutoRestart},
				cli.StringFlag{Name: "colors, b", EnvVar: "OVERMIND_COLORS", Usage: "Specify the xterm color codes that will be used to colorize process names. Divide codes with comma"},
				cli.BoolFlag{Name: "show-timestamps, T", EnvVar: "OVERMIND_SHOW_TIMESTAMPS", Usage: "Add timestamps to the output", Destination: &c.ShowTimestamps},
				cli.StringFlag{Name: "formation, m", EnvVar: "OVERMIND_FORMATION", Usage: "Specify the number of each process type to run. The value passed in should be in the format process=num,process=num. Use 'all' as a process name to set value for all processes"},
				cli.IntFlag{Name: "formation-port-step", EnvVar: "OVERMIND_FORMATION_PORT_STEP", Usage: "Specify a step to increase port number for the next instance of a process", Value: 10, Destination: &c.FormationPortStep},
				cli.StringFlag{Name: "stop-signals, i", EnvVar: "OVERMIND_STOP_SIGNALS", Usage: "Specify a signal that will be sent to each process when Overmind will try to stop them. The value passed in should be in the format process=signal,process=signal. Supported signals are: ABRT, INT, KILL, QUIT, STOP, TERM, USR1, USR2"},
				cli.BoolFlag{Name: "daemonize, D", EnvVar: "OVERMIND_DAEMONIZE", Usage: "Launch Overmind as a daemon. Use 'overmind echo' to view logs and 'overmind quit' to gracefully quit daemonized instance", Destination: &c.Daemonize},
				cli.StringFlag{Name: "tmux-config, F", EnvVar: "OVERMIND_TMUX_CONFIG", Usage: "Specify an alternative tmux config path to be used by Overmind", Destination: &c.TmuxConfigPath},
				cli.StringFlag{Name: "ignored-processes, x", EnvVar: "OVERMIND_IGNORED_PROCESSES", Usage: "Specify process names to prevent from launching. Useful if you want to run all but one or two processes. Divide names with comma. Takes precedence over the 'processes' flag.", Destination: &c.IgnoredProcNames},
				cli.StringFlag{Name: "shell, H", EnvVar: "OVERMIND_SHELL", Usage: "Specify shell to run processes with.", Value: "sh", Destination: &c.Shell},
			},
			socketFlags(&c.SocketPath, &c.Network)...,
		),
	}
}

func setupRestartCmd() cli.Command {
	c := cmdRestartHandler{}

	return cli.Command{
		Name:      "restart",
		Aliases:   []string{"r"},
		Usage:     "Restart specified processes",
		Action:    c.Run,
		ArgsUsage: "[process name...]",
		Flags:     socketFlags(&c.SocketPath, &c.Network),
	}
}

func setupStopCmd() cli.Command {
	c := cmdStopHandler{}

	return cli.Command{
		Name:      "stop",
		Aliases:   []string{"interrupt", "i"},
		Usage:     "Stop specified processes without quitting Overmind itself",
		Action:    c.Run,
		ArgsUsage: "[process name...]",
		Flags:     socketFlags(&c.SocketPath, &c.Network),
	}
}

func setupConnectCmd() cli.Command {
	c := cmdConnectHandler{}

	return cli.Command{
		Name:      "connect",
		Aliases:   []string{"c"},
		Usage:     "Connect to the tmux session of the specified process",
		Action:    c.Run,
		ArgsUsage: "[process name]",
		Flags: append(
			[]cli.Flag{
				cli.BoolFlag{Name: "control-mode, c", EnvVar: "OVERMIND_CONTROL_MODE", Usage: "Connect to the tmux session in control mode", Destination: &c.ControlMode},
			},
			socketFlags(&c.SocketPath, &c.Network)...,
		),
	}
}

func setupQuitCmd() cli.Command {
	c := cmdQuitHandler{}

	return cli.Command{
		Name:    "quit",
		Aliases: []string{"q"},
		Usage:   "Gracefully quits Overmind. Same as sending SIGINT",
		Action:  c.Run,
		Flags:   socketFlags(&c.SocketPath, &c.Network),
	}
}

func setupKillCmd() cli.Command {
	c := cmdKillHandler{}

	return cli.Command{
		Name:    "kill",
		Aliases: []string{"k"},
		Usage:   "Kills all processes",
		Action:  c.Run,
		Flags:   socketFlags(&c.SocketPath, &c.Network),
	}
}

func setupRunCmd() cli.Command {
	c := cmdRunHandler{}

	return cli.Command{
		Name:            "run",
		Aliases:         []string{"exec", "e"},
		Usage:           "Runs provided command within the Overmind environment",
		Action:          c.Run,
		SkipFlagParsing: true,
	}
}

func setupEchoCmd() cli.Command {
	c := cmdEchoHandler{}

	return cli.Command{
		Name:   "echo",
		Usage:  "Echoes output from master Overmind instance",
		Action: c.Run,
		Flags:  socketFlags(&c.SocketPath, &c.Network),
	}
}

func setupStatusCmd() cli.Command {
	c := cmdStatusHandler{}

	return cli.Command{
		Name:    "status",
		Aliases: []string{"ps"},
		Usage:   "Prints process statuses",
		Action:  c.Run,
		Flags:   socketFlags(&c.SocketPath, &c.Network),
	}
}

func main() {
	loadEnvFiles()

	app := cli.NewApp()

	app.Name = "Overmind"
	app.HelpName = "overmind"
	app.Usage = "The mind to rule processes of your development environment"
	app.Description = strings.Join([]string{
		"Overmind runs commands specified in procfile in a tmux session.",
		"This allows to connect to each process and manage processes on fly.",
	}, " ")
	app.Author = "Sergey \"DarthSim\" Alexandrovich"
	app.Email = "darthsim@gmail.com"
	app.Version = version

	app.Commands = []cli.Command{
		setupStartCmd(),
		setupRestartCmd(),
		setupStopCmd(),
		setupConnectCmd(),
		setupQuitCmd(),
		setupKillCmd(),
		setupRunCmd(),
		setupEchoCmd(),
		setupStatusCmd(),
	}

	app.Run(os.Args)
}

func loadEnvFiles() {
	// First load the specifically named overmind env files
	userHomeDir, _ := os.UserHomeDir()
	loadEnvFile(path.Join(userHomeDir, ".overmind.env"))
	loadEnvFile("./.overmind.env")

	_, skipEnv := os.LookupEnv("OVERMIND_SKIP_ENV")
	if !skipEnv {
		loadEnvFile("./.env")
	}

	envs := strings.Split(os.Getenv("OVERMIND_ENV"), ",")
	for _, e := range envs {
		if len(e) > 0 {
			loadEnvFile(e)
		}
	}
}

func loadEnvFile(file string) {
	err := godotenv.Overload(file)
	if err != nil {
		if !os.IsNotExist(err) {
			fmt.Fprintln(os.Stderr, "overmind: skipping", file, "due to error:", err)
		}
	}
}