package config

import (
	"fmt"

	"gopkg.in/yaml.v3"
)

// EffectivePipelineRootPath reports the absolute root pipeline path retained
// while resolving cfg. It is empty for a pipeline not loaded through the
// production loader.
func EffectivePipelineRootPath(cfg *PipelineConfig) string {
	if cfg == nil || cfg.resolution == nil {
		return ""
	}
	return cfg.resolution.rootPath
}

// MarshalEffectivePipeline renders the validated, normalized pipeline as one
// deterministic YAML document. Composition declarations and runtime-only
// resolution data are excluded. Artifact family declarations are also omitted
// because a resolved pipeline exposes their concrete artifacts instead.
func MarshalEffectivePipeline(cfg *PipelineConfig) ([]byte, error) {
	if cfg == nil {
		return nil, fmt.Errorf("pipeline config is required")
	}

	data, err := yaml.Marshal(cfg)
	if err != nil {
		return nil, fmt.Errorf("serialize effective pipeline: %w", err)
	}
	document, err := parseCompositionBytes("effective pipeline", data)
	if err != nil {
		return nil, err
	}
	removeResolutionOnlyPipelineFields(document)
	return document.canonicalYAML()
}

func removeResolutionOnlyPipelineFields(document *compositionDocument) {
	if document == nil || document.root == nil {
		return
	}
	scriptoriumIndex := compositionFieldIndex(document.root.fields, "scriptorium")
	if scriptoriumIndex < 0 {
		return
	}
	scriptorium := document.root.fields[scriptoriumIndex].value
	if scriptorium == nil || scriptorium.kind != yaml.MappingNode {
		return
	}
	familyIndex := compositionFieldIndex(scriptorium.fields, "artifact_families")
	if familyIndex < 0 {
		return
	}
	scriptorium.fields = append(scriptorium.fields[:familyIndex], scriptorium.fields[familyIndex+1:]...)
	for index := range scriptorium.fields {
		scriptorium.fields[index].order = index
	}
}