package nixbuild

import (
	"context"
	"errors"
	"io"
	"iter"
)

// Build builds all entries yielded by installables.
func Build(ctx context.Context, installables iter.Seq[string]) error {
	c, cancel := context.WithCancel(ctx)
	defer cancel()

	cmd := Nix(c, CommandBuild,
		FlagKeepGoing, FlagNoLink, FlagStdin)
	if Stdout != nil {
		cmd.Stdout = Stdout
		cmd.Args = append(cmd.Args, FlagPrintBuildLogs)
	} else {
		cmd.Args = append(cmd.Args, FlagQuiet)
	}
	if Stderr != nil {
		cmd.Stderr = Stderr
		cmd.Args = append(cmd.Args, FlagVerbose)
	}

	ir, iw := io.Pipe()
	cmd.Stdin = ir

	if err := cmd.Start(); err != nil {
		return err
	}

	if _, err := WriteStdin(iw, installables); err != nil {
		return errors.Join(err, cmd.Wait())
	}
	if err := iw.Close(); err != nil {
		return errors.Join(err, cmd.Wait())
	}

	return cmd.Wait()
}