"use client";

import { useEffect, useState } from "react";
import Modal from "@/components/Modal";
import { POST_DELETE_TYPES } from "@/lib/api";

export type DeleteCommentPayload = {
  delete_type: string;
  delete_reason: string;
};

/**
 * 评论软删弹窗：
 * - 评论者自删：必填理由（仅管理可见）
 * - 管理删：必选类型；仅「其他」须填理由
 */
export default function DeleteCommentModal({
  open,
  mode,
  busy,
  onClose,
  onConfirm,
}: {
  open: boolean;
  /** self=评论者自删；staff=版主/后台删除 */
  mode: "self" | "staff";
  busy?: boolean;
  onClose: () => void;
  onConfirm: (opts: DeleteCommentPayload) => void;
}) {
  const [deleteType, setDeleteType] = useState("spam");
  const [reason, setReason] = useState("");
  const [err, setErr] = useState("");

  useEffect(() => {
    if (open) {
      setDeleteType("spam");
      setReason("");
      setErr("");
    }
  }, [open]);

  if (!open) return null;

  const isStaff = mode === "staff";
  const reasonRequired = !isStaff || deleteType === "other";

  const submit = () => {
    const r = reason.trim();
    if (reasonRequired) {
      if (!r) {
        setErr("请填写删除理由");
        return;
      }
      if ([...r].length > 200) {
        setErr("删除理由不能超过 200 字");
        return;
      }
    }
    onConfirm({
      delete_type: isStaff ? deleteType : "",
      delete_reason: reasonRequired ? r : "",
    });
  };

  return (
    <Modal
      open
      title={isStaff ? "删除评论" : "删除我的评论"}
      description={
        isStaff
          ? "评论区保留匿名马赛克占位，读者看不到评论者头像与名称；可见删除类型，「其他」时还会展示补充理由。子回复不受影响。"
          : "评论区保留马赛克占位，读者仅见「评论者已删除此评论」。你填写的理由仅管理员可见。"
      }
      onClose={onClose}
      busy={busy}
      maxWidthClass="max-w-[440px]"
      panelClassName="p-5"
      ariaLabel={isStaff ? "删除评论" : "删除我的评论"}
      footer={
        <>
          <button type="button" className="btn btn-line" onClick={onClose} disabled={busy}>
            取消
          </button>
          <button type="button" className="btn btn-danger" onClick={submit} disabled={busy}>
            {busy ? "删除中…" : "确认删除"}
          </button>
        </>
      }
    >
      {isStaff ? (
        <>
          <p className="mb-2 text-[12.5px] font-medium" style={{ color: "var(--ink)" }}>
            删除类型
          </p>
          <div
            className="grid grid-cols-1 sm:grid-cols-2 gap-1.5 mb-1"
            role="radiogroup"
            aria-label="删除类型"
          >
            {POST_DELETE_TYPES.map((t) => {
              const active = deleteType === t.value;
              return (
                <button
                  key={t.value}
                  type="button"
                  role="radio"
                  aria-checked={active}
                  onClick={() => {
                    setDeleteType(t.value);
                    setErr("");
                    if (t.value !== "other") setReason("");
                  }}
                  className="text-left rounded-lg px-3 py-2.5 text-[13px] transition-colors"
                  style={{
                    border: `1.5px solid ${active ? "var(--accent)" : "var(--line)"}`,
                    background: active ? "var(--accent-soft)" : "var(--panel-2)",
                    color: active ? "var(--accent)" : "var(--ink)",
                  }}
                >
                  {t.label}
                </button>
              );
            })}
          </div>
          <p className="meta text-[11.5px] mb-4 leading-relaxed">
            选「其他」时需补充理由；其余类型直接按标签展示给读者。
          </p>
        </>
      ) : null}

      {reasonRequired ? (
        <>
          <label
            className="block mb-1.5 text-[12.5px] font-medium"
            style={{ color: "var(--ink)" }}
            htmlFor="cmt-delete-reason"
          >
            {isStaff ? "补充理由" : "删除理由"}{" "}
            <span style={{ color: "var(--danger)" }}>*</span>
          </label>
          <textarea
            id="cmt-delete-reason"
            className="field"
            rows={3}
            value={reason}
            onChange={(e) => {
              setReason(e.target.value);
              setErr("");
            }}
            placeholder={
              isStaff
                ? "向读者说明删除原因（将展示在占位中）"
                : "例如：发错了 / 不想保留（仅管理员可见）"
            }
            maxLength={200}
            autoFocus={!isStaff}
          />
          <p className="meta text-[11.5px] mt-1.5">
            {isStaff ? "将公开显示在评论占位旁。" : "普通读者看不到这条理由。"}
          </p>
        </>
      ) : null}

      {err ? (
        <p className="mt-2 text-[12px]" style={{ color: "var(--danger)" }}>
          {err}
        </p>
      ) : null}
    </Modal>
  );
}