package build

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

	"gitea.maximumdirect.net/eric/ReleaseKit/internal/candidate"
	"gitea.maximumdirect.net/eric/ReleaseKit/internal/gotool"
	"gitea.maximumdirect.net/eric/ReleaseKit/internal/releaseidentity"
	"gitea.maximumdirect.net/eric/ReleaseKit/internal/tempdir"
)

func CandidateCallback(spec *Spec, output io.Writer) func(context.Context, candidate.Candidate, *gotool.Owner) 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, owner *gotool.Owner) error {
		moduleSubdir, err := filepath.Rel(captured.RepositoryDir, captured.ModuleDir)
		if err != nil {
			return fmt.Errorf("resolve captured module path: %w", err)
		}
		identity := releaseidentity.Identity{
			Selection: releaseidentity.Selection{
				RepositoryDir: captured.RepositoryDir,
				ModuleDir:     captured.ModuleDir,
				ModuleSubdir:  filepath.ToSlash(moduleSubdir),
			},
			ModulePath: captured.ModulePath,
			Version:    captured.Version,
			Tag:        captured.Tag,
			NotePath:   filepath.ToSlash(filepath.Join(moduleSubdir, "docs", "releases", captured.Version+".md")),
		}
		temporaryDir, err := tempdir.Outside(captured.RepositoryDir, "releasekit-candidate-build-")
		if err != nil {
			return fmt.Errorf("create temporary candidate build output: %w", err)
		}
		defer os.RemoveAll(temporaryDir)
		_, err = BuildResolved(ctx, Request{
			Identity:  identity,
			Spec:      selected,
			OutputDir: temporaryDir,
			Output:    output,
			ToolOwner: owner,
		})
		if err != nil {
			return fmt.Errorf("build candidate: %w", err)
		}
		return nil
	}
}