package main

import (
	"archive/zip"
	"fmt"
	"os"
	"strings"
)

type Command struct {
	Name        string
	Description string
	Action      func([]string) Result
	Arguments   []string
	IsVarargs   bool
}

func Failed(message string) Result {
	return Result{
		HasFailed: true,
		Message:   message,
	}
}

func Ok(message string) Result {
	return Result{
		HasFailed: false,
		Message:   message,
	}
}

type Result struct {
	Message   string
	HasFailed bool
}

var commands = []Command{
	{
		Name:        "install",
		Description: "Install one or more mod archives into modman",
		Arguments:   []string{"archive path"},
		IsVarargs:   true,

		Action: func(arguments []string) Result {
			var processed = 0

			for i := range arguments {
				var archivePath = arguments[i]

				if strings.HasSuffix(archivePath, ".zip") {
					var reader, err = zip.OpenReader(archivePath)

					if err == nil {
						defer reader.Close()

						processed += 1
					}

					continue
				}
			}

			return Ok(fmt.Sprint(processed, "of", len(arguments), "installed"))
		},
	},

	{
		Name:        "remove",
		Description: "Remove one or more mods from modman",
		Arguments:   []string{"mod name"},
		IsVarargs:   true,

		Action: func(arguments []string) Result {
			// TODO: Implement.
			return Failed("Not implemented")
		},
	},

	{
		Name:        "rename",
		Description: "Rename a mod within modman",
		Arguments:   []string{"mod name", "new name"},
		IsVarargs:   false,

		Action: func(arguments []string) Result {
			// TODO: Implement.
			return Failed("Not implemented")
		},
	},

	{
		Name:        "list",
		Description: "List all installed mods",
		Arguments:   []string{},
		IsVarargs:   false,

		Action: func(arguments []string) Result {
			// TODO: Implement.
			return Failed("Not implemented")
		},
	},

	{
		Name:        "deploy",
		Description: "Deploy all installed and enabled mods",
		Arguments:   []string{},
		IsVarargs:   false,

		Action: func(arguments []string) Result {
			// TODO: Implement.
			return Failed("Not implemented")
		},
	},
}

func main() {
	var argCount = len(os.Args)

	if argCount == 1 {
		fmt.Println("Modman v0.1")
		fmt.Println("Enter one of the following commands following modman:")

		for i := range commands {
			var command = commands[i]

			fmt.Print("\t", command.Name)

			for j := range command.Arguments {
				fmt.Print(" [", command.Arguments[j], "]")
			}

			if command.IsVarargs {
				fmt.Println("...")
			} else {
				fmt.Println()
			}
		}

		return
	}

	var commandName = os.Args[1]

	for i := range commands {
		var command = commands[i]

		if command.Name == commandName {
			var result = command.Action(os.Args[2:])

			if result.HasFailed {
				fmt.Fprint(os.Stderr, result.Message)
				os.Exit(1)
			}

			fmt.Print(result.Message)

			return
		}
	}
}