package releasekit

import (
	"context"
	"io"

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

// ErrInvalidVersion reports a version that is not stable vMAJOR.MINOR.PATCH.
var ErrInvalidVersion = candidate.ErrInvalidVersion

// Candidate identifies one committed local source revision selected for
// validation.
type Candidate struct {
	RepositoryDir string
	Commit        string
	Version       string
}

// ReleaseRequest contains the inputs used to validate and optionally build one
// local candidate. Remote is retained for publication operations; Check makes
// no remote availability claim.
type ReleaseRequest struct {
	RepositoryDir string
	Product       string
	Version       string
	Remote        string
	Validate      func(context.Context, Candidate) error
	Build         *BuildSpec // optional selected-target build after validation.
	Output        io.Writer
}

// Check validates one local, committed release candidate. It requires a clean
// worktree and index on main, a committed note matching Product and Version,
// and an unused local tag. If Validate is nil, the offline Go test suite runs.
// If Build selects targets, Check builds them after validation in temporary
// storage outside the worktree, then rechecks branch, HEAD, worktree, index,
// and local tag state. Success establishes local candidate evidence only; it
// does not establish remote availability.
func Check(ctx context.Context, request ReleaseRequest) (Candidate, error) {
	var validate func(context.Context, candidate.Candidate) error
	if request.Validate != nil {
		validate = func(ctx context.Context, captured candidate.Candidate) error {
			return request.Validate(ctx, Candidate{
				RepositoryDir: captured.RepositoryDir,
				Commit:        captured.Commit,
				Version:       captured.Version,
			})
		}
	}
	checked, err := candidate.Check(ctx, candidate.Request{
		RepositoryDir: request.RepositoryDir,
		Product:       request.Product,
		Version:       request.Version,
		Validate:      validate,
		AfterValidate: internalbuild.CandidateCallback(internalBuildSpec(request.Build), request.Output),
		Output:        request.Output,
	})
	if err != nil {
		return Candidate{}, err
	}
	return Candidate{
		RepositoryDir: checked.RepositoryDir,
		Commit:        checked.Commit,
		Version:       checked.Version,
	}, nil
}