import { useCallback, useEffect, useState } from 'react';
import axios from 'axios';

import { APP_ENDPOINTS } from '../../../config/env';
import { resolveApiErrorMessage } from '../../../shared/http/apiErrors';
import type { BotState } from '../../../types/bot';
import { getLlmProviderDefaultApiBase } from '../../../utils/llmProviders';
import type { DashboardLabels } from '../localeTypes';
import type { AgentTab, BotEditForm, BotParamDraft, NanobotImage } from '../types';
import { clampCpuCores, clampMaxTokens, clampMemoryMb, clampStorageGb, clampTemperature } from '../utils';

const DEFAULT_EDIT_FORM: BotEditForm = {
  name: '',
  access_password: '',
  llm_provider: '',
  llm_model: '',
  image_tag: '',
  api_key: '',
  api_base: '',
  temperature: 0.2,
  top_p: 1,
  max_tokens: 8192,
  cpu_cores: 1,
  memory_mb: 1024,
  storage_gb: 10,
  system_timezone: '',
  agents_md: '',
  soul_md: '',
  user_md: '',
  tools_md: '',
  identity_md: '',
};

const DEFAULT_PARAM_DRAFT: BotParamDraft = {
  max_tokens: '8192',
  cpu_cores: '1',
  memory_mb: '1024',
  storage_gb: '10',
};

const agentFieldByTab: Record<AgentTab, keyof BotEditForm> = {
  AGENTS: 'agents_md',
  SOUL: 'soul_md',
  USER: 'user_md',
  TOOLS: 'tools_md',
  IDENTITY: 'identity_md',
};

type PromptTone = 'info' | 'success' | 'warning' | 'error';

interface NotifyOptions {
  title?: string;
  tone?: PromptTone;
  durationMs?: number;
}

interface UseDashboardBotEditorOptions {
  ensureSelectedBotDetail: () => Promise<BotState | undefined>;
  isZh: boolean;
  notify: (message: string, options?: NotifyOptions) => void;
  refresh: () => Promise<void>;
  selectedBotId: string;
  selectedBot?: BotState;
  setRuntimeMenuOpen: (open: boolean) => void;
  availableImages: NanobotImage[];
  t: DashboardLabels;
}

export function useDashboardBotEditor({
  ensureSelectedBotDetail,
  isZh,
  notify,
  refresh,
  selectedBotId,
  selectedBot,
  setRuntimeMenuOpen,
  availableImages,
  t,
}: UseDashboardBotEditorOptions) {
  const [agentTab, setAgentTab] = useState<AgentTab>('AGENTS');
  const [isSaving, setIsSaving] = useState(false);
  const [isTestingProvider, setIsTestingProvider] = useState(false);
  const [providerTestResult, setProviderTestResult] = useState('');
  const [editForm, setEditForm] = useState<BotEditForm>(DEFAULT_EDIT_FORM);
  const [paramDraft, setParamDraft] = useState<BotParamDraft>(DEFAULT_PARAM_DRAFT);
  const [showBaseModal, setShowBaseModal] = useState(false);
  const [showParamModal, setShowParamModal] = useState(false);
  const [showAgentModal, setShowAgentModal] = useState(false);

  const applyEditFormFromBot = useCallback((bot?: BotState) => {
    if (!bot) return;
    const provider = String(bot.llm_provider || '').trim().toLowerCase();
    setProviderTestResult('');
    setEditForm({
      name: bot.name || '',
      access_password: bot.access_password || '',
      llm_provider: provider,
      llm_model: bot.llm_model || '',
      image_tag: bot.image_tag || '',
      api_key: '',
      api_base: bot.api_base || '',
      temperature: clampTemperature(bot.temperature ?? 0.2),
      top_p: bot.top_p ?? 1,
      max_tokens: clampMaxTokens(bot.max_tokens ?? 8192),
      cpu_cores: clampCpuCores(bot.cpu_cores ?? 1),
      memory_mb: clampMemoryMb(bot.memory_mb ?? 1024),
      storage_gb: clampStorageGb(bot.storage_gb ?? 10),
      system_timezone: bot.system_timezone || '',
      agents_md: bot.agents_md || '',
      soul_md: bot.soul_md || '',
      user_md: bot.user_md || '',
      tools_md: bot.tools_md || '',
      identity_md: bot.identity_md || '',
    });
    setParamDraft({
      max_tokens: String(clampMaxTokens(bot.max_tokens ?? 8192)),
      cpu_cores: String(clampCpuCores(bot.cpu_cores ?? 1)),
      memory_mb: String(clampMemoryMb(bot.memory_mb ?? 1024)),
      storage_gb: String(clampStorageGb(bot.storage_gb ?? 10)),
    });
  }, []);

  const updateEditForm = useCallback((patch: Partial<BotEditForm>) => {
    setEditForm((prev) => ({ ...prev, ...patch }));
  }, []);

  const updateParamDraft = useCallback((patch: Partial<BotParamDraft>) => {
    setParamDraft((prev) => ({ ...prev, ...patch }));
  }, []);

  const updateAgentTabValue = useCallback((tab: AgentTab, nextValue: string) => {
    const field = agentFieldByTab[tab];
    setEditForm((prev) => ({ ...prev, [field]: nextValue }));
  }, []);

  const onBaseProviderChange = useCallback((provider: string) => {
    setEditForm((prev) => {
      const nextProvider = String(provider || '').trim().toLowerCase();
      const nextDefaultApiBase = getLlmProviderDefaultApiBase(nextProvider);
      return {
        ...prev,
        llm_provider: nextProvider,
        api_base: nextDefaultApiBase,
      };
    });
    setProviderTestResult('');
  }, []);

  const closeModals = useCallback(() => {
    setShowBaseModal(false);
    setShowParamModal(false);
    setShowAgentModal(false);
  }, []);

  useEffect(() => {
    if (!selectedBotId) return;
    if (showBaseModal || showParamModal || showAgentModal) return;
    applyEditFormFromBot(selectedBot);
  }, [
    applyEditFormFromBot,
    selectedBot,
    selectedBot?.id,
    selectedBot?.updated_at,
    selectedBotId,
    showAgentModal,
    showBaseModal,
    showParamModal,
  ]);

  const openBaseConfigModal = useCallback(async () => {
    setRuntimeMenuOpen(false);
    const detail = await ensureSelectedBotDetail();
    applyEditFormFromBot(detail);
    setShowBaseModal(true);
  }, [applyEditFormFromBot, ensureSelectedBotDetail, setRuntimeMenuOpen]);

  const openParamConfigModal = useCallback(async () => {
    setRuntimeMenuOpen(false);
    const detail = await ensureSelectedBotDetail();
    applyEditFormFromBot(detail);
    setShowParamModal(true);
  }, [applyEditFormFromBot, ensureSelectedBotDetail, setRuntimeMenuOpen]);

  const openAgentFilesModal = useCallback(async () => {
    setRuntimeMenuOpen(false);
    const detail = await ensureSelectedBotDetail();
    applyEditFormFromBot(detail);
    setShowAgentModal(true);
  }, [applyEditFormFromBot, ensureSelectedBotDetail, setRuntimeMenuOpen]);

  const testProviderConnection = useCallback(async () => {
    if (!editForm.llm_provider || !editForm.llm_model || !editForm.api_key.trim()) {
      notify(t.providerRequired, { tone: 'warning' });
      return;
    }
    setIsTestingProvider(true);
    setProviderTestResult('');
    try {
      const res = await axios.post(`${APP_ENDPOINTS.apiBase}/providers/test`, {
        provider: editForm.llm_provider,
        model: editForm.llm_model,
        api_key: editForm.api_key.trim(),
        api_base: editForm.api_base.trim(),
      });
      if (res.data?.ok) {
        const preview = (res.data.models_preview || []).slice(0, 3).join(', ');
        setProviderTestResult(t.connOk(preview));
      } else {
        setProviderTestResult(t.connFail(res.data?.detail || 'unknown error'));
      }
    } catch (error: unknown) {
      const msg = resolveApiErrorMessage(error, 'request failed');
      setProviderTestResult(t.connFail(msg));
    } finally {
      setIsTestingProvider(false);
    }
  }, [editForm.api_base, editForm.api_key, editForm.llm_model, editForm.llm_provider, notify, t]);

  const saveBot = useCallback(async (mode: 'params' | 'agent' | 'base') => {
    const targetBotId = String(selectedBot?.id || selectedBotId || '').trim();
    if (!targetBotId) {
      notify(isZh ? '未选中 Bot，无法保存。' : 'No bot selected.', { tone: 'warning' });
      return;
    }
    setIsSaving(true);
    try {
      const payload: Record<string, string | number> = {};
      if (mode === 'base') {
        const normalizedSystemTimezone = editForm.system_timezone.trim();
        if (!normalizedSystemTimezone) {
          notify(isZh ? '系统时区不能为空。' : 'System timezone is required.', { tone: 'warning' });
          return;
        }
        payload.name = editForm.name;
        payload.access_password = editForm.access_password;
        payload.image_tag = editForm.image_tag;
        payload.system_timezone = normalizedSystemTimezone;
        const normalizedImageTag = String(editForm.image_tag || '').trim();
        const selectedImage = availableImages.find((row) => String(row.tag || '').trim() === normalizedImageTag);
        const selectedImageStatus = String(selectedImage?.status || '').toUpperCase();
        if (normalizedImageTag && (!selectedImage || selectedImageStatus !== 'READY')) {
          throw new Error(isZh ? '当前镜像不可用，请选择可用镜像。' : 'Selected image is unavailable.');
        }
        const normalizedCpuCores = clampCpuCores(Number(paramDraft.cpu_cores));
        const normalizedMemoryMb = clampMemoryMb(Number(paramDraft.memory_mb));
        const normalizedStorageGb = clampStorageGb(Number(paramDraft.storage_gb));
        payload.cpu_cores = normalizedCpuCores;
        payload.memory_mb = normalizedMemoryMb;
        payload.storage_gb = normalizedStorageGb;
        setEditForm((prev) => ({
          ...prev,
          cpu_cores: normalizedCpuCores,
          memory_mb: normalizedMemoryMb,
          storage_gb: normalizedStorageGb,
        }));
        setParamDraft((prev) => ({
          ...prev,
          cpu_cores: String(normalizedCpuCores),
          memory_mb: String(normalizedMemoryMb),
          storage_gb: String(normalizedStorageGb),
        }));
      }
      if (mode === 'params') {
        payload.llm_provider = editForm.llm_provider;
        payload.llm_model = editForm.llm_model;
        payload.api_base = editForm.api_base.trim();
        if (editForm.api_key.trim()) payload.api_key = editForm.api_key.trim();
        payload.temperature = clampTemperature(Number(editForm.temperature));
        payload.top_p = Number(editForm.top_p);
        const normalizedMaxTokens = clampMaxTokens(Number(paramDraft.max_tokens));
        payload.max_tokens = normalizedMaxTokens;
        setEditForm((prev) => ({
          ...prev,
          max_tokens: normalizedMaxTokens,
        }));
        setParamDraft((prev) => ({ ...prev, max_tokens: String(normalizedMaxTokens) }));
      }
      if (mode === 'agent') {
        payload.agents_md = editForm.agents_md;
        payload.soul_md = editForm.soul_md;
        payload.user_md = editForm.user_md;
        payload.tools_md = editForm.tools_md;
        payload.identity_md = editForm.identity_md;
      }

      await axios.put(`${APP_ENDPOINTS.apiBase}/bots/${targetBotId}`, payload);
      await refresh();
      closeModals();
      notify(t.configUpdated, { tone: 'success' });
    } catch (error: unknown) {
      const msg = resolveApiErrorMessage(error, t.saveFail);
      notify(msg, { tone: 'error' });
    } finally {
      setIsSaving(false);
    }
  }, [
    availableImages,
    closeModals,
    editForm,
    isZh,
    notify,
    paramDraft,
    refresh,
    selectedBot?.id,
    selectedBotId,
    t,
  ]);

  return {
    agentFieldByTab,
    agentTab,
    applyEditFormFromBot,
    editForm,
    isSaving,
    isTestingProvider,
    onBaseProviderChange,
    openAgentFilesModal,
    openBaseConfigModal,
    openParamConfigModal,
    paramDraft,
    providerTestResult,
    saveBot,
    setAgentTab,
    setShowAgentModal,
    setShowBaseModal,
    setShowParamModal,
    showAgentModal,
    showBaseModal,
    showParamModal,
    testProviderConnection,
    updateAgentTabValue,
    updateEditForm,
    updateParamDraft,
  };
}