package app

import (
	"context"
	"fmt"
	"io"
	"strings"
)

var supportedCommands = []string{"run", "run-stage", "resume", "analyze", "publish", "clean", "session"}

// Execute dispatches CLI commands and returns a process exit code.
func Execute(args []string, stdout, stderr io.Writer) int {
	if len(args) == 0 {
		printUsage(stderr)
		return 1
	}

	ctx := context.Background()
	cmd := args[0]
	cmdArgs := args[1:]

	var err error
	switch cmd {
	case "run":
		err = Run(ctx, cmdArgs, stdout)
	case "resume":
		err = Resume(ctx, cmdArgs, stdout)
	case "run-stage":
		err = RunStage(ctx, cmdArgs, stdout)
	case "analyze":
		err = Analyze(ctx, cmdArgs, stdout)
	case "publish":
		err = Publish(ctx, cmdArgs, stdout)
	case "session":
		err = Session(ctx, cmdArgs, stdout)
	case "clean":
		err = Clean(ctx, cmdArgs, stdout)
	default:
		fmt.Fprintf(stderr, "unknown command: %q\n\n", cmd)
		printUsage(stderr)
		return 1
	}

	if err != nil {
		fmt.Fprintf(stderr, "%v\n", err)
		return 1
	}

	return 0
}

func printUsage(w io.Writer) {
	fmt.Fprintf(w, "Usage: narratio <%s>\n", strings.Join(supportedCommands, "|"))
}

func placeholder(out io.Writer, command string) error {
	_, err := fmt.Fprintf(out, "narratio %s: not yet implemented\n", command)
	return err
}