package config

import (
	configkit "gitea.maximumdirect.net/eric/ConfigKit"
)

// LoadOptions contains configuration selections supplied by an application
// boundary. It is intentionally narrow: configuration discovery and CLI flag
// parsing remain outside this package.
type LoadOptions struct {
	Profile   string
	Overrides []configkit.Override
}

// loadDocument is the private ConfigKit load boundary under construction.
// Production commands continue to use the existing version 4 loader until the
// runtime conversion and command wiring are complete.
func loadDocument(path string, options LoadOptions) (*configkit.Result[Document], error) {
	return loadDocumentSource(configkit.File(path), options)
}

func loadDocumentSource(source configkit.Source, options LoadOptions) (*configkit.Result[Document], error) {
	return configkit.Load(source, configkit.Options[Document]{
		Definition: documentDefinition(),
		Profile:    options.Profile,
		Overrides:  options.Overrides,
	})
}

func documentDefinition() configkit.Definition[Document] {
	return configkit.Definition[Document]{
		Defaults: func() Document {
			return Document{
				Pipelines: map[string]PipelineDocument{},
				Concurrency: &ConcurrencyDocument{
					StageWorkers: map[string]int{},
				},
			}
		},
		Version: &configkit.VersionRule{
			Path:  configkit.Keys("version"),
			Check: validateDocumentVersion,
		},
	}
}

func validateDocumentVersion(version configkit.Version, validation *configkit.Validation) error {
	if !version.Present || version.Null {
		validation.Error(configkit.Keys("version"), "configuration version is required")
		return nil
	}
	if version.Text == "4" {
		validation.Error(configkit.Keys("version"), "configuration version 4 is no longer supported; migrate to version 5")
		return nil
	}
	if version.Text != "5" {
		validation.Error(configkit.Keys("version"), "unsupported configuration version")
	}
	return nil
}