package engine

import "gitea.maximumdirect.net/eric/ConfigKit/internal/document"

func validateFinalSequenceIdentities(root *document.Node, policy sequencePolicy) []Diagnostic {
	if root == nil || policy.selectorTrie == nil {
		return nil
	}
	var diagnostics []Diagnostic
	var visit func(*document.Node, Path, []*sequenceSelectorTrie)
	visit = func(node *document.Node, path Path, states []*sequenceSelectorTrie) {
		if node == nil {
			return
		}
		if node.Kind == document.Sequence {
			var fields []string
			for _, state := range states {
				if state.terminal {
					fields = state.fields
					break
				}
			}
			if fields != nil {
				_, issues := validateNormalizedSequenceIdentityFrom(node, path, fields, sequenceIdentityDiagnosticCodes{
					invalid: CodeSequenceInvalid, conflict: CodeSequenceConflict,
				}, 0)
				diagnostics = append(diagnostics, issues...)
			}
			return
		}
		if node.Kind != document.Mapping {
			return
		}
		for _, entry := range node.Mapping {
			next := make([]*sequenceSelectorTrie, 0, len(states)*2)
			for _, state := range states {
				if literal := state.literals[entry.Key]; literal != nil {
					next = append(next, literal)
				}
				if state.wildcard != nil {
					next = append(next, state.wildcard)
				}
			}
			if len(next) != 0 {
				visit(entry.Value, path.Key(entry.Key), next)
			}
		}
	}
	visit(root, Path{}, []*sequenceSelectorTrie{policy.selectorTrie})
	return canonicalDiagnostics(diagnostics)
}