import { useState, type ReactNode } from 'react';
import { AlertTriangle, ShieldCheck, Trash2 } from 'lucide-react';
import { adminApi, clientApi, type DeletionPreflight, type DeletionResolutionAction, type DeletionResult, type DeletionTargetType } from '@/api/adminApi';
import { createUuid } from '@/utils/randomId';
import { Button } from './Button';
import { Modal } from './Modal';
import { Textarea } from './Textarea';

export function DeleteRiskAction({ portal, targetType, targetId, children = '删除', icon = <Trash2 size={15} />, disabled, onCompleted }: {
  portal: 'admin' | 'client';
  targetType: DeletionTargetType;
  targetId: string;
  children?: ReactNode;
  icon?: ReactNode;
  disabled?: boolean;
  onCompleted?: (result: DeletionResult) => void;
}) {
  const [open, setOpen] = useState(false);
  const [loading, setLoading] = useState(false);
  const [submitting, setSubmitting] = useState(false);
  const [preflight, setPreflight] = useState<DeletionPreflight | null>(null);
  const [result, setResult] = useState<DeletionResult | null>(null);
  const [reason, setReason] = useState('');
  const [selections, setSelections] = useState<Set<DeletionResolutionAction>>(() => new Set());
  const [error, setError] = useState('');
  const [idempotencyKey, setIdempotencyKey] = useState('');

  async function begin() {
    const key = `delete:${targetType}:${targetId}:${createUuid()}`;
    setOpen(true); setLoading(true); setPreflight(null); setResult(null); setReason(''); setSelections(new Set()); setError(''); setIdempotencyKey(key);
    try {
      const data = portal === 'admin'
        ? await adminApi.getDeletionPreflight(targetType, targetId)
        : await clientApi.getDeletionPreflight(targetType as Exclude<DeletionTargetType, 'channel'>, targetId);
      setPreflight(data);
    } catch (failure) {
      setError(failure instanceof Error ? failure.message : '删除资格预检失败');
    } finally { setLoading(false); }
  }

  async function confirm() {
    if (!preflight?.allowedActions.includes('delete') || !allSelectionsConfirmed(preflight, selections)) return;
    setSubmitting(true); setError('');
    try {
      const body = {
        expectedUpdatedAt: preflight.expectedUpdatedAt,
        idempotencyKey,
        reason: reason.trim() || undefined,
        deleteAssociatedTemplates: selections.has('delete_associated_templates'),
        deleteAssociatedDrainage: selections.has('delete_associated_drainage'),
        abandonAssociatedReportTasks: selections.has('abandon_associated_report_tasks'),
      };
      const completed = portal === 'admin'
        ? await adminApi.deleteGovernedTarget(targetType, targetId, body)
        : await clientApi.deleteGovernedTarget(targetType as Exclude<DeletionTargetType, 'channel'>, targetId, body);
      setResult(completed);
    } catch (failure) {
      setError(failure instanceof Error ? failure.message : '删除失败，请重新检查依赖后重试');
    } finally { setSubmitting(false); }
  }

  function close() {
    if (submitting) return;
    setOpen(false);
    if (result) onCompleted?.(result);
  }
  function toggleSelection(action: DeletionResolutionAction, checked: boolean) {
    setSelections((current) => {
      const next = new Set(current);
      if (checked) next.add(action); else next.delete(action);
      return next;
    });
  }
  const blocked = Boolean(preflight && !preflight.allowedActions.includes('delete'));
  const selectionsConfirmed = Boolean(preflight && allSelectionsConfirmed(preflight, selections));
  const footer = (requestClose: () => void) => result ? <Button onClick={close}>关闭</Button> : <>
    <Button disabled={submitting} onClick={requestClose} variant="ghost">取消</Button>
    <Button disabled={loading || submitting || blocked || !preflight || !selectionsConfirmed} icon={<Trash2 size={15} />} onClick={() => void confirm()} variant="danger">
      {submitting ? '删除处理中…' : '确认删除'}
    </Button>
  </>;

  return <>
    <Button disabled={disabled} icon={icon} onClick={() => void begin()} size="sm" variant="danger">{children}</Button>
    <Modal dirty={!result && reason.trim().length > 0} footer={({ requestClose }) => footer(requestClose)} onClose={close} open={open} title="删除资格与影响确认">
      <div className="risk-action-content delete-risk-action">
        {result ? (
          <div className="risk-action-result" role="status"><ShieldCheck size={20} /><div><strong>删除已完成</strong><span>操作单号：{result.operationId}{result.replayed ? '（幂等重放）' : ''}</span></div></div>
        ) : (
          <>
            {loading ? <p role="status">正在从后台检查引用关系与当前状态…</p> : null}
            {preflight ? <>
              <div className="risk-action-identity">
                {Object.entries(preflight.identity).map(([key, value]) => <div key={key}><span>{identityLabels[key] ?? key}</span><strong>{value}</strong></div>)}
              </div>
              <section><h3>依赖与资格检查</h3>{preflight.dependencies.filter((item) => item.detailsVisible).length ? <ul className="delete-risk-dependencies">{preflight.dependencies.filter((item) => item.detailsVisible).map((item) => <li key={item.kind}><strong>{item.label}</strong><span>{item.count} 项</span>{item.items.length ? <small>{item.items.join('；')}</small> : <small>无活动引用</small>}</li>)}</ul> : null}</section>
              {preflight.blockedReasons.length
                ? <ul className="risk-action-blockers">{preflight.blockedReasons.map((item) => <li key={item}><AlertTriangle size={15} />{item}</li>)}</ul>
                : <p className="risk-action-passed"><ShieldCheck size={16} />资格检查通过，可以执行逻辑删除</p>}
              {preflight.requiredSelections.length ? <section className="delete-risk-selections"><h3>关联数据处理确认</h3>{preflight.requiredSelections.map((selection) => (
                <label key={selection.action}>
                  <input
                    checked={selections.has(selection.action)}
                    onChange={(event) => toggleSelection(selection.action, event.target.checked)}
                    type="checkbox"
                  />
                  <span><strong>{selection.label}</strong><small>{selection.description}</small></span>
                </label>
              ))}<p className="muted">发现的关联数据处理项必须全部勾选后，才可以确认删除。</p></section> : null}
              <section><h3>影响范围</h3><ul>{preflight.impacts.map((item) => <li key={item}>{item}</li>)}</ul><p className="muted">{preflight.recoverability.description}</p></section>
              {!blocked ? <Textarea label="删除原因（选填）" onChange={(event) => setReason(event.target.value)} placeholder="如填写，将写入审计记录" value={reason} /> : null}
            </> : null}
            {error ? <p className="form-error" role="alert">{error}</p> : null}
          </>
        )}
      </div>
    </Modal>
  </>;
}

const identityLabels: Record<string, string> = { name: '对象名称', id: '唯一标识', code: '通道编码', tenant: '所属企业', application: '短信应用', signature: '关联签名' };

function allSelectionsConfirmed(preflight: DeletionPreflight, selections: Set<DeletionResolutionAction>) {
  return preflight.requiredSelections.every((selection) => selections.has(selection.action));
}