package npcinteractions

import (
	"sort"

	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/dnd/shared"
)

type orderedInteractionResponse struct {
	value       interactionResponse
	earliest    int
	hasEvidence bool
}

func canonicalizeResponse(response *extractionResponse, order shared.SourceRefOrder, sourceID string) {
	if response == nil {
		return
	}
	ordered := make([]orderedInteractionResponse, len(response.Interactions))
	for index := range response.Interactions {
		earliest, hasEvidence := canonicalizeInteraction(&response.Interactions[index], order, sourceID)
		ordered[index] = orderedInteractionResponse{
			value:       response.Interactions[index],
			earliest:    earliest,
			hasEvidence: hasEvidence,
		}
	}
	sort.SliceStable(ordered, func(i, j int) bool {
		if ordered[i].hasEvidence != ordered[j].hasEvidence {
			return ordered[i].hasEvidence
		}
		if !ordered[i].hasEvidence {
			return false
		}
		return ordered[i].earliest < ordered[j].earliest
	})
	for index := range ordered {
		response.Interactions[index] = ordered[index].value
	}
}

func canonicalizeInteraction(interaction *interactionResponse, order shared.SourceRefOrder, sourceID string) (int, bool) {
	if interaction == nil {
		return 0, false
	}
	refs := order.Canonicalize(canonicalSourceRefs(interaction.SourceRefs, sourceID))
	interaction.SourceRefs = interactionResponseRefs(refs)
	return order.EarliestValid(refs)
}

func canonicalInteractionList(response extractionResponse, sourceID string) dnd.NPCInteractionList {
	interactions := make([]dnd.NPCInteraction, len(response.Interactions))
	for index, interaction := range response.Interactions {
		interactions[index] = dnd.NPCInteraction{
			Name:       interaction.Name,
			Kind:       dnd.NPCInteractionKind(interaction.Kind),
			SourceRefs: canonicalSourceRefs(interaction.SourceRefs, sourceID),
		}
	}
	if response.Interactions == nil {
		interactions = nil
	}
	return dnd.NPCInteractionList{Interactions: interactions}
}

func canonicalSourceRefs(refs []interactionSourceRefResponse, sourceID string) []source.SourceRef {
	if refs == nil {
		return nil
	}
	out := make([]source.SourceRef, len(refs))
	for index, ref := range refs {
		out[index] = source.SourceRef{SourceID: sourceID, StartUnitID: ref.StartUnitID, EndUnitID: ref.EndUnitID}
	}
	return out
}

func interactionResponseRefs(refs []source.SourceRef) []interactionSourceRefResponse {
	if refs == nil {
		return nil
	}
	values := make([]interactionSourceRefResponse, len(refs))
	for index, ref := range refs {
		values[index] = interactionSourceRefResponse{StartUnitID: ref.StartUnitID, EndUnitID: ref.EndUnitID}
	}
	return values
}