package app

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

// RegenerateArtifacts expands the convenience command into its canonical run
// invocation. The run command remains the sole owner of parsing and execution.
func RegenerateArtifacts(ctx context.Context, args []string, out io.Writer) error {
	if containsHelpOption(args) {
		printRegenerateArtifactsHelp(out)
		return nil
	}

	expanded := make([]string, 0, len(args)+5)
	if len(args) > 0 && !isCLIFlagToken(args[0]) {
		expanded = append(expanded, args[0])
		args = args[1:]
	}
	expanded = append(expanded, "--force", "--from", "extract", "--through", "analyze")
	expanded = append(expanded, args...)
	return runCommandFn(ctx, expanded, out)
}

func containsHelpOption(args []string) bool {
	for _, arg := range args {
		if arg == "-h" || arg == "--help" {
			return true
		}
	}
	return false
}

func printRegenerateArtifactsHelp(out io.Writer) {
	_, _ = fmt.Fprintln(out, "Usage: narratio regenerate-artifacts <session_id> [--artifacts <name[,name...]>] [common config flags]")
	_, _ = fmt.Fprintln(out)
	_, _ = fmt.Fprintln(out, "Exactly equivalent to:")
	_, _ = fmt.Fprintln(out, "  narratio run <session_id> --force --from extract --through analyze [caller options]")
	_, _ = fmt.Fprintln(out)
	_, _ = fmt.Fprintln(out, "Extraction always runs; selected analysis artifacts and their required prerequisites are rebuilt. Publish and notify never run.")
}