import { useEffect, useRef, useState } from 'react';
import { FormInstance } from 'antd';
import { Agent, AgentAPI, Team, TeamAPI, AiModel, ModelAPI, ImageAPI } from '../../../api';
import { DEFAULT_AVATAR } from '../constants';

interface UseAgentEditorOptions {
  id?: string;
  isNew: boolean;
  form: FormInstance;
  message: any;
  navigate: any;
}

export function useAgentEditor({ id, isNew, form, message, navigate }: UseAgentEditorOptions) {
  const [agent, setAgent] = useState<Agent | null>(null);
  const [saving, setSaving] = useState(false);
  const [teams, setTeams] = useState<Team[]>([]);
  const [models, setModels] = useState<AiModel[]>([]);
  const [autoSaveStatus, setAutoSaveStatus] = useState<'saved' | 'dirty' | 'saving' | 'error'>('saved');
  const [initModalOpen, setInitModalOpen] = useState(isNew);
  const [selectedAvatar, setSelectedAvatar] = useState(DEFAULT_AVATAR);
  const [avatarSelectorOpen, setAvatarSelectorOpen] = useState(false);
  const [avatarUploading, setAvatarUploading] = useState(false);
  const [agentName, setAgentName] = useState('');
  const [skillEditorOpen, setSkillEditorOpen] = useState(false);
  const [editingSkillId, setEditingSkillId] = useState<string | null>(null);

  const pollTimer = useRef<number | null>(null);
  const pollCount = useRef(0);
  const hydratingRef = useRef(false);

  const MAX_POLL_COUNT = 30;

  const stopPolling = () => {
    if (pollTimer.current) {
      window.clearInterval(pollTimer.current);
      pollTimer.current = null;
    }
    pollCount.current = 0;
  };

  const startPolling = () => {
    pollCount.current = 0;
    if (pollTimer.current) {
      window.clearInterval(pollTimer.current);
    }
    pollTimer.current = window.setInterval(pollKnowledgeStatus, 4000);
    pollKnowledgeStatus();
  };

  const pollKnowledgeStatus = async () => {
    if (!id) return;
    try {
      const result = await AgentAPI.getKnowledgeStatus(id);
      const files = result.files || [];
      
      setAgent((prev) => {
        if (!prev) return prev;
        return { ...prev, knowledge: files };
      });

      const indexing = files.some((k) => k.status === 'pending' || k.status === 'indexing');
      pollCount.current++;

      if (!indexing || pollCount.current >= MAX_POLL_COUNT) {
        stopPolling();
        if (!indexing) {
          refresh(false);
        } else {
          message.warning('部分文件处理超时，请稍后刷新页面查看结果');
        }
      }
    } catch (e) {
      pollCount.current++;
      if (pollCount.current >= MAX_POLL_COUNT) {
        stopPolling();
        message.warning('知识库状态查询超时，请稍后刷新页面查看结果');
      }
    }
  };

  const refresh = async (force = false) => {
    if (!id) return;
    const data = await AgentAPI.detail(id);
    setAgent(data);
    if (force || autoSaveStatus !== 'dirty') {
      hydratingRef.current = true;
      form.setFieldsValue(data);
      window.setTimeout(() => {
        hydratingRef.current = false;
      }, 0);
      setAutoSaveStatus('saved');
      setAgentName(data.name);
      setSelectedAvatar(data.avatar || DEFAULT_AVATAR);
    }

    const indexing = data.knowledge?.some((k) => k.status === 'pending' || k.status === 'indexing');
    if (indexing && !pollTimer.current) {
      startPolling();
    }
  };

  useEffect(() => {
    TeamAPI.list()
      .then(setTeams)
      .catch(() => setTeams([]));
    ModelAPI.list()
      .then(setModels)
      .catch(() => setModels([]));
    if (isNew) {
      setInitModalOpen(true);
      setSelectedAvatar(DEFAULT_AVATAR);
      setAgentName('');
      form.setFieldsValue({
        name: '',
        description: '',
        prompt: 'You are a helpful AI assistant.',
        model: '',
        temperature: 0.7,
        visibility: 'private',
        teamId: null,
      });
    } else {
      setInitModalOpen(false);
      refresh(true);
    }
    return () => {
      if (pollTimer.current) {
        window.clearInterval(pollTimer.current);
        pollTimer.current = null;
      }
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [id]);

  const handleInitConfirm = async (values: any) => {
    setSaving(true);
    try {
      const created = await AgentAPI.create({
        ...values,
        avatar: selectedAvatar,
        prompt: 'You are a helpful AI assistant.',
        temperature: 0.7,
        visibility: 'private',
      });
      message.success('初始化成功');
      setInitModalOpen(false);
      navigate(`/agents/${created.id}`, { replace: true });
    } catch (e) {
      message.error('创建失败');
    } finally {
      setSaving(false);
    }
  };

  const handleSave = async (silent = false) => {
    if (isNew) return;
    const values = await form.validateFields();
    if (!silent) setSaving(true);
    setAutoSaveStatus('saving');
    try {
      const changedFields: Record<string, any> = {};
      Object.keys(values).forEach((key) => {
        const formValue = (values as any)[key];
        const originalValue = (agent as any)?.[key];
        if (formValue !== originalValue) {
          changedFields[key] = formValue;
        }
      });
      if (Object.keys(changedFields).length === 0) {
        if (!silent) message.info('无变化');
        setAutoSaveStatus('saved');
        return;
      }
      const updatedAgent = await AgentAPI.update(id!, changedFields);
      setAgent(updatedAgent);
      form.setFieldsValue(updatedAgent);
      if (!silent) message.success('已保存');
      setAutoSaveStatus('saved');
    } catch (e) {
      setAutoSaveStatus('error');
      if (!silent) message.error('保存失败');
    } finally {
      if (!silent) setSaving(false);
    }
  };

  const uploadAvatar = async (file: File) => {
    setAvatarUploading(true);
    try {
      const res = await ImageAPI.upload([file]);
      const url = res.files?.[0]?.url;
      if (!url) {
        throw new Error('未获取到图片地址');
      }
      return url;
    } finally {
      setAvatarUploading(false);
    }
  };

  const handleDeleteKnowledge = async (fileId: string) => {
    if (!id) return;
    try {
      await AgentAPI.deleteKnowledge(id, fileId);
      setAgent((prev) => {
        if (!prev) return prev;
        return {
          ...prev,
          knowledge: (prev.knowledge || []).filter((k: any) => k.id !== fileId),
        };
      });
      message.success('已删除');
    } catch (e: any) {
      message.error('删除失败：' + (e?.message ?? e));
    }
  };

  const beforeUploadKnowledge = async (file: any) => {
    if (!id) {
      message.warning('请先保存智能体基础信息后再上传');
      return false;
    }
    try {
      const result = await AgentAPI.uploadKnowledge(id, [file as File]);
      setAgent((prev) => {
        if (!prev) return prev;
        const existingIds = new Set((prev.knowledge || []).map((k: any) => k.id));
        const uniqueNewFiles = (result.files || []).filter((f: any) => !existingIds.has(f.id));
        return {
          ...prev,
          knowledge: [...uniqueNewFiles, ...(prev.knowledge || [])],
        };
      });
      startPolling();
      message.success(`${file.name} 已上传，正在建索引…`);
    } catch (e: any) {
      message.error('上传失败：' + (e?.message ?? e));
    }
    return false;
  };

  const beforeUploadInitAvatar = async (file: any) => {
    try {
      const url = await uploadAvatar(file as File);
      setSelectedAvatar(url);
      message.success('头像上传成功');
    } catch (e: any) {
      message.error('头像上传失败：' + (e?.message ?? e));
    }
    return false;
  };

  const handleAvatarSelect = async (avatarUrl: string) => {
    if (!id) return;
    try {
      await AgentAPI.updateAvatar(id, avatarUrl);
      setAgent((prev) => {
        if (!prev) return prev;
        return { ...prev, avatar: avatarUrl };
      });
      setSelectedAvatar(avatarUrl);
      message.success('头像已更新');
      setAvatarSelectorOpen(false);
    } catch (e: any) {
      message.error('头像更新失败：' + (e?.message ?? e));
    }
  };

  const beforeUploadEditAvatar = async (file: any) => {
    if (!id) return false;
    try {
      const url = await uploadAvatar(file as File);
      await AgentAPI.updateAvatar(id, url);
      setAgent((prev) => {
        if (!prev) return prev;
        return { ...prev, avatar: url };
      });
      setSelectedAvatar(url);
      message.success('头像已更新');
      setAvatarSelectorOpen(false);
    } catch (e: any) {
      message.error('头像上传失败：' + (e?.message ?? e));
    }
    return false;
  };

  const liveAgent = { ...(agent ?? {}), ...(form.getFieldsValue() as Agent) } as Agent;
  const currentName = agent?.name || liveAgent?.name || agentName || undefined;

  const markDirty = () => {
    if (hydratingRef.current) return;
    setAutoSaveStatus('dirty');
  };

  return {
    agent,
    saving,
    teams,
    models,
    autoSaveStatus,
    initModalOpen,
    setInitModalOpen,
    selectedAvatar,
    setSelectedAvatar,
    avatarSelectorOpen,
    setAvatarSelectorOpen,
    avatarUploading,
    agentName,
    setAgentName,
    skillEditorOpen,
    setSkillEditorOpen,
    editingSkillId,
    setEditingSkillId,
    hydratingRef,
    refresh,
    handleInitConfirm,
    handleSave,
    beforeUploadKnowledge,
    beforeUploadInitAvatar,
    beforeUploadEditAvatar,
    handleAvatarSelect,
    handleDeleteKnowledge,
    liveAgent,
    currentName,
    markDirty,
  };
}