package cli

import (
	"fmt"
	"io"
	"os"
	"strings"

	"git.hrafn.xyz/aether/gosick/internal/homesick/core"
	"git.hrafn.xyz/aether/gosick/internal/homesick/version"
)

func Run(args []string, stdout io.Writer, stderr io.Writer) int {
	app, err := core.New(stdout, stderr)
	if err != nil {
		_, _ = fmt.Fprintf(stderr, "error: %v\n", err)
		return 1
	}

	if len(args) == 0 {
		printHelp(stdout)
		return 0
	}

	command := args[0]
	switch command {
	case "-v", "--version", "version":
		if err := app.Version(version.String); err != nil {
			_, _ = fmt.Fprintf(stderr, "error: %v\n", err)
			return 1
		}
		return 0
	case "help", "--help", "-h":
		printHelp(stdout)
		return 0
	case "clone":
		if len(args) < 2 {
			_, _ = fmt.Fprintln(stderr, "error: clone requires URI")
			return 1
		}
		destination := ""
		if len(args) > 2 {
			destination = args[2]
		}
		if err := app.Clone(args[1], destination); err != nil {
			_, _ = fmt.Fprintf(stderr, "error: %v\n", err)
			return 1
		}
		return 0
	case "list":
		if err := app.List(); err != nil {
			_, _ = fmt.Fprintf(stderr, "error: %v\n", err)
			return 1
		}
		return 0
	case "show_path":
		castle := defaultCastle(args)
		if err := app.ShowPath(castle); err != nil {
			_, _ = fmt.Fprintf(stderr, "error: %v\n", err)
			return 1
		}
		return 0
	case "status":
		castle := defaultCastle(args)
		if err := app.Status(castle); err != nil {
			_, _ = fmt.Fprintf(stderr, "error: %v\n", err)
			return 1
		}
		return 0
	case "diff":
		castle := defaultCastle(args)
		if err := app.Diff(castle); err != nil {
			_, _ = fmt.Fprintf(stderr, "error: %v\n", err)
			return 1
		}
		return 0
	case "link", "unlink", "track", "pull", "push", "commit", "destroy", "cd", "open", "exec", "exec_all", "rc", "generate":
		_, _ = fmt.Fprintf(stderr, "error: %s is not implemented in Go yet\n", command)
		return 2
	default:
		_, _ = fmt.Fprintf(stderr, "error: unknown command %q\n\n", command)
		printHelp(stderr)
		return 1
	}
}

func defaultCastle(args []string) string {
	if len(args) > 1 && strings.TrimSpace(args[1]) != "" {
		return args[1]
	}
	return "dotfiles"
}

func printHelp(w io.Writer) {
	_, _ = fmt.Fprintln(w, "homesick (Go scaffold)")
	_, _ = fmt.Fprintln(w, "")
	_, _ = fmt.Fprintln(w, "Implemented commands:")
	_, _ = fmt.Fprintln(w, "  clone URI [CASTLE_NAME]")
	_, _ = fmt.Fprintln(w, "  list")
	_, _ = fmt.Fprintln(w, "  show_path [CASTLE]")
	_, _ = fmt.Fprintln(w, "  status [CASTLE]")
	_, _ = fmt.Fprintln(w, "  diff [CASTLE]")
	_, _ = fmt.Fprintln(w, "  version | -v | --version")
	_, _ = fmt.Fprintln(w, "")
	_, _ = fmt.Fprintln(w, "Not implemented yet:")
	_, _ = fmt.Fprintln(w, "  link, unlink, track, pull, push, commit, destroy, cd, open, exec, exec_all, rc, generate")
	_, _ = fmt.Fprintln(w, "")
	_, _ = fmt.Fprintln(w, "Build: go build -o dist/homesick-go ./cmd/homesick")
}

func init() {
	_ = os.Setenv("GIT_TERMINAL_PROMPT", "0")
}