import { useState } from "react";
import type { DiffSide, RangeStart } from "~/components/DiffView";

type Target = { path: string; line: number; side: DiffSide; startLine: number | null; startSide: DiffSide | null };

export type DraftComment = Target & { key: string; body: string };

export function useReviewDraft() {
  const [comments, setComments] = useState<DraftComment[]>([]);
  const [composing, setComposing] = useState<Target | null>(null);

  return {
    comments,
    composing,
    start: (path: string, line: number, side: DiffSide, start?: RangeStart) =>
      setComposing({ path, line, side, startLine: start?.line ?? null, startSide: start?.side ?? null }),
    cancel: () => setComposing(null),
    add: (body: string) => {
      if (!composing) return;
      setComments((current) => [
        ...current,
        { ...composing, body, key: `${composing.path}:${composing.side}:${composing.line}:${current.length}` },
      ]);
      setComposing(null);
    },
    remove: (key: string) => setComments((current) => current.filter((comment) => comment.key !== key)),
    clear: () => setComments([]),
  };
}