import type { AlignmentPair, AlignmentPlan, PlannedAction } from './types';
export const planAlignmentActions = (
alignment: AlignmentPair[],
changedEnglishBlockIndexes: Set<number>
): AlignmentPlan => {
const actions: PlannedAction[] = [];
const seenFrench = new Set<number>();
alignment.forEach((pair) => {
const englishIndex = pair.englishIndex;
const frenchIndex = pair.frenchIndex;
// Case 1: Deletion (Exists in FR, not in EN)
if (englishIndex === -1 && frenchIndex !== null) {
if (!seenFrench.has(frenchIndex)) {
actions.push({ kind: 'delete', frenchIndex });
seenFrench.add(frenchIndex);
}
return;
}
// Case 2: New Insertion (Exists in EN, not in FR)
if (englishIndex >= 0 && frenchIndex === null) {
actions.push({ kind: 'insert_new', englishIndex });
return;
}
// Case 3: Alignment (Exists in both)
if (englishIndex >= 0 && frenchIndex !== null) {
const isChanged = changedEnglishBlockIndexes.has(englishIndex);
// If the block is NOT marked as changed by Git, we REUSE it.
// We assume the existing translation is correct because the source hasn't been touched.
// We ignore 'similarityScore' here because EN vs UK text will always have low similarity.
if (!isChanged) {
actions.push({ kind: 'reuse', englishIndex, frenchIndex });
} else {
// If the block IS changed, we normally Review.
// OPTIONAL: You could add a check here for 'similarityScore > 0.99'
// to detect whitespace-only changes, but generally, if Git says changed, we Review.
actions.push({ kind: 'review', englishIndex, frenchIndex });
}
seenFrench.add(frenchIndex);
return;
}
});
return { actions };
};
