// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: MIT

// Command statements walks the top-level statements of a TOML document with
// interpres.Statements, the shape a configuration tool uses to read the
// sections it cares about and skip the rest.
package main

import (
	"fmt"
	"io"
	"os"

	"sourcedock.dev/petrbalvin/interpres/v2"
)

func main() {
	if err := run(os.Stdin, os.Stdout); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

func run(stdin io.Reader, stdout io.Writer) error {
	for stmt, err := range interpres.Statements(stdin) {
		if err != nil {
			return err
		}
		switch {
		case stmt.Index >= 0:
			fmt.Fprintf(stdout, "[[%s]] #%d\n", stmt.Key, stmt.Index)
		case stmt.Table != nil:
			fmt.Fprintf(stdout, "[%s] keys: %v\n", stmt.Key, stmt.Table.Keys())
		default:
			fmt.Fprintf(stdout, "%s = %v\n", stmt.Key, stmt.Value)
		}
	}
	return nil
}