package releasekit

import (
	"context"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strings"

	"gitea.maximumdirect.net/eric/ReleaseKit/internal/candidate"
)

func candidateBuildCallback(spec *BuildSpec, output io.Writer) func(context.Context, candidate.Candidate) error {
	if spec == nil || len(spec.Targets) == 0 {
		return nil
	}
	selected := *spec
	selected.Targets = append([]Target(nil), spec.Targets...)
	return func(ctx context.Context, captured candidate.Candidate) error {
		temporaryDir, err := os.MkdirTemp(filepath.Dir(captured.RepositoryDir), ".releasekit-candidate-build-")
		if err != nil {
			return fmt.Errorf("create temporary candidate build output: %w", err)
		}
		defer os.RemoveAll(temporaryDir)
		relative, err := filepath.Rel(captured.RepositoryDir, temporaryDir)
		if err != nil {
			return fmt.Errorf("verify temporary candidate build output: %w", err)
		}
		if relative == "." || relative != ".." && !strings.HasPrefix(relative, ".."+string(filepath.Separator)) {
			return fmt.Errorf("temporary candidate build output %q is inside the repository", temporaryDir)
		}
		_, err = Build(ctx, BuildRequest{
			RepositoryDir: captured.RepositoryDir,
			Version:       captured.Version,
			Spec:          selected,
			OutputDir:     temporaryDir,
			Output:        output,
		})
		if err != nil {
			return fmt.Errorf("build candidate: %w", err)
		}
		return nil
	}
}