package commandkit

import (
	"context"
	"errors"
	"fmt"

	configkit "gitea.maximumdirect.net/eric/ConfigKit"
	"gitea.maximumdirect.net/eric/promptkit"
)

// NewPromptKitScope adapts PromptKit's captured configuration inspection to
// CommandKit's configuration commands.
func NewPromptKitScope[C any](
	load func(context.Context, Selection, C) (*promptkit.Engine, error),
) (ConfigScope[C], error) {
	if load == nil {
		return ConfigScope[C]{}, fmt.Errorf("PromptKit configuration loader is nil")
	}

	return ConfigScope[C]{
		Name:       "promptkit",
		Summary:    "PromptKit engine configuration.",
		Operations: []ConfigOperation{ConfigValidate, ConfigShow, ConfigSources, ConfigExplain},
		Acquire: func(ctx context.Context, request ConfigRequest, appContext C) (Acquired[ConfigView], error) {
			engine, err := load(ctx, request.Selection, appContext)
			if err != nil {
				var loadErr *configkit.LoadError
				if errors.As(err, &loadErr) {
					return Acquired[ConfigView]{Diagnostics: ConfigKitDiagnostics("promptkit", loadErr.Sources(), loadErr.Diagnostics())}, err
				}
				return Acquired[ConfigView]{}, err
			}
			if engine == nil {
				return Acquired[ConfigView]{}, fmt.Errorf("PromptKit configuration loader returned a nil engine")
			}

			inspection, err := engine.InspectConfiguration()
			if err != nil {
				return Acquired[ConfigView]{}, err
			}
			sources := inspection.Sources()
			diagnostics := ConfigKitDiagnostics("promptkit", sources, inspection.Diagnostics())
			return Acquired[ConfigView]{
				Value: ConfigView{
					Effective:   inspection,
					Sources:     inspection,
					Explanation: inspection,
				},
				Diagnostics: diagnostics,
			}, nil
		},
	}, nil
}