package releasekit

import (
	"context"
	"errors"
	"fmt"
	"strings"

	internalpreparation "gitea.maximumdirect.net/eric/ReleaseKit/internal/preparation"
	"gitea.maximumdirect.net/eric/ReleaseKit/internal/releaseidentity"
)

// TaggedCheckoutRequest selects a stable tag and the full Git object ID
// expected by an external build or CI event. An empty Remote selects origin.
type TaggedCheckoutRequest struct {
	RepositoryDir  string
	Version        string
	Remote         string
	ExpectedCommit string
}

// PrepareTaggedCheckout fetches Version from Remote, verifies that its peeled
// commit matches ExpectedCommit, and checks out that commit detached. This
// operation mutates the selected local repository; use it for disposable
// checkouts where tag-fetch and checkout conflicts can be resolved by the
// caller. It does not publish a tag or hosted content.
func PrepareTaggedCheckout(ctx context.Context, request TaggedCheckoutRequest) error {
	return internalpreparation.PrepareTaggedCheckout(ctx, internalpreparation.TaggedCheckoutRequest{
		RepositoryDir:  request.RepositoryDir,
		Version:        request.Version,
		Remote:         request.Remote,
		ExpectedCommit: request.ExpectedCommit,
	})
}

// DependencyPreparationRequest selects the repository module whose dependencies
// should be prepared.
type DependencyPreparationRequest struct {
	RepositoryDir string
	// ModuleDir selects a repository-relative module directory; empty selects
	// the repository root.
	ModuleDir string
}

// PrepareBuildDependencies runs `go mod download` in the selected module with
// workspace discovery disabled and the locally available compatible Go
// toolchain selected. It may access module networks and updates the Go module
// cache using the caller's Go proxy, private-module, credential, and cache
// settings. If required checksums are missing, the Go command may update
// go.sum. Cancellation and Go command failures are returned to the caller.
func PrepareBuildDependencies(ctx context.Context, request DependencyPreparationRequest) error {
	if strings.TrimSpace(request.RepositoryDir) == "" {
		return errors.New("repository directory is required")
	}
	selection, err := releaseidentity.ResolveSelection(request.RepositoryDir, request.ModuleDir)
	if err != nil {
		return fmt.Errorf("resolve dependency preparation module: %w", err)
	}
	return internalpreparation.PrepareBuildDependencies(ctx, selection.ModuleDir)
}