/**
 * StreamStore — manages streaming orchestration, chat mode, and suggestions.
 *
 * Extracted from chatStore.ts as part of the structured refactor (Phase 4).
 * Responsible for:
 *   - Stream lifecycle (sendMessage, initStreamListener)
 *   - Chat mode state (chatMode, setChatMode, getChatModeConfig)
 *   - Follow-up suggestions
 *   - Skill search
 *
 * Design: streamStore holds its own `isStreaming` state and delegates
 * message mutations to chatStore via an injected reference. This avoids
 * circular imports while keeping high-frequency streaming updates
 * (dozens of set() calls per second) on a single Zustand store.
 */

import { create } from 'zustand';
import { persist } from 'zustand/middleware';
import type { AgentStreamDelta } from '../../lib/gateway-client';
import { getClient } from '../../store/connectionStore';
import { intelligenceClient } from '../../lib/intelligence-client';
import { getMemoryExtractor } from '../../lib/memory-extractor';
import { getSkillDiscovery } from '../../lib/skill-discovery';
import { useOfflineStore, isOffline } from '../../store/offlineStore';
import { useConnectionStore } from '../../store/connectionStore';
import { createLogger } from '../../lib/logger';
import { speechSynth } from '../../lib/speech-synth';
import { generateRandomString } from '../../lib/crypto-utils';
import type { ChatModeType, ChatModeConfig, Subtask } from '../../components/ai';
import type { ToolCallStep } from '../../components/ai';
import { CHAT_MODES } from '../../components/ai';
import {
  useConversationStore,
  resolveGatewayAgentId,
} from './conversationStore';
import { useMessageStore } from './messageStore';
import { useArtifactStore } from './artifactStore';

const log = createLogger('StreamStore');

// ---------------------------------------------------------------------------
// Types
// ---------------------------------------------------------------------------

/** Message shape used internally by streamStore for typed callbacks. */
interface StreamMsg {
  id: string;
  role: 'user' | 'assistant' | 'tool' | 'hand' | 'workflow' | 'system';
  content: string;
  timestamp: Date;
  streaming?: boolean;
  optimistic?: boolean;
  runId?: string;
  error?: string;
  thinkingContent?: string;
  toolSteps?: ToolCallStep[];
  handName?: string;
  handStatus?: string;
  handResult?: unknown;
  workflowId?: string;
  workflowStep?: string;
  workflowStatus?: string;
  workflowResult?: unknown;
  subtasks?: Subtask[];
}

/** Shape of the chatStore methods needed by streamStore. */
interface ChatStoreAccess {
  addMessage: (msg: StreamMsg) => void;
  updateMessages: (updater: (msgs: StreamMsg[]) => StreamMsg[]) => void;
  getMessages: () => StreamMsg[];
  setChatStoreState: (partial: Record<string, unknown>) => void;
}

export interface StreamState {
  isStreaming: boolean;
  isLoading: boolean;
  chatMode: ChatModeType;
  suggestions: string[];
  /** Run ID of the currently active stream (null when idle). */
  activeRunId: string | null;

  // Core streaming
  sendMessage: (content: string) => Promise<void>;
  initStreamListener: () => () => void;
  /** Cancel the active stream: resets state, marks message cancelled, saves conversation. */
  cancelStream: () => void;

  // Chat mode
  setChatMode: (mode: ChatModeType) => void;
  getChatModeConfig: () => ChatModeConfig;

  // Suggestions
  setSuggestions: (suggestions: string[]) => void;

  // Skill search
  searchSkills: (query: string) => {
    results: Array<{ id: string; name: string; description: string }>;
    totalAvailable: number;
  };

  // Loading
  setIsLoading: (loading: boolean) => void;
}

// ---------------------------------------------------------------------------
// Follow-up suggestion generator
// ---------------------------------------------------------------------------

function generateFollowUpSuggestions(content: string): string[] {
  const suggestions: string[] = [];
  const lower = content.toLowerCase();

  const patterns: Array<{ keywords: string[]; suggestion: string }> = [
    { keywords: ['代码', 'code', 'function', '函数', '实现'], suggestion: '解释这段代码的工作原理' },
    { keywords: ['错误', 'error', 'bug', '问题'], suggestion: '如何调试这个问题？' },
    { keywords: ['数据', 'data', '分析', '统计'], suggestion: '可视化这些数据' },
    { keywords: ['步骤', 'step', '流程', '方案'], suggestion: '详细说明第一步该怎么做' },
    { keywords: ['可以', '建议', '推荐', '试试'], suggestion: '还有其他方案吗？' },
    { keywords: ['文件', 'file', '保存', '写入'], suggestion: '查看生成的文件内容' },
    { keywords: ['搜索', 'search', '查找', 'research'], suggestion: '搜索更多相关信息' },
  ];

  for (const { keywords, suggestion } of patterns) {
    if (keywords.some(kw => lower.includes(kw))) {
      if (!suggestions.includes(suggestion)) {
        suggestions.push(suggestion);
      }
    }
    if (suggestions.length >= 3) break;
  }

  const generic = ['继续深入分析', '换个角度看看', '用简单的话解释'];
  while (suggestions.length < 3) {
    const next = generic.find(g => !suggestions.includes(g));
    if (next) suggestions.push(next);
    else break;
  }

  return suggestions;
}

// ---------------------------------------------------------------------------
// ChatStore injection (avoids circular imports)
// ---------------------------------------------------------------------------

let _chat: ChatStoreAccess | null = null;

/**
 * Inject chatStore access for message mutations.
 * Called by chatStore after creation.
 */
export function injectChatStore(access: ChatStoreAccess): void {
  _chat = access;
}

// ---------------------------------------------------------------------------
// Store
// ---------------------------------------------------------------------------

export const useStreamStore = create<StreamState>()(
  persist(
    (set, get) => ({
  isStreaming: false,
  isLoading: false,
  chatMode: 'thinking' as ChatModeType,
  suggestions: [],
  activeRunId: null as string | null,

  // ── Chat Mode ──

  setChatMode: (mode: ChatModeType) => set({ chatMode: mode }),

  getChatModeConfig: () => CHAT_MODES[get().chatMode].config,

  setSuggestions: (suggestions: string[]) => set({ suggestions }),

  setIsLoading: (loading: boolean) => set({ isLoading: loading }),

  // ── Skill Search ──

  searchSkills: (query: string) => {
    const discovery = getSkillDiscovery();
    const result = discovery.searchSkills(query);
    return {
      results: result.results.map(s => ({ id: s.id, name: s.name, description: s.description })),
      totalAvailable: result.totalAvailable,
    };
  },

  // ── Core: sendMessage ──

  sendMessage: async (content: string) => {
    if (get().isStreaming) return;
    if (!_chat) {
      log.warn('sendMessage called before chatStore injection');
      return;
    }

    const convStore = useConversationStore.getState();
    const currentAgent = convStore.currentAgent;
    const sessionKey = convStore.sessionKey;

    set({ suggestions: [] });
    const effectiveSessionKey = sessionKey || crypto.randomUUID();
    const effectiveAgentId = resolveGatewayAgentId(currentAgent);
    const agentId = currentAgent?.id || 'zclaw-main';

    // Offline path
    if (isOffline()) {
      const { queueMessage } = useOfflineStore.getState();
      const queueId = queueMessage(content, effectiveAgentId, effectiveSessionKey);
      log.debug(`Offline - message queued: ${queueId}`);

      _chat.addMessage({
        id: `system_${Date.now()}`,
        role: 'system',
        content: `后端服务不可用，消息已保存到本地队列。恢复连接后将自动发送。`,
        timestamp: new Date(),
      });

      _chat.addMessage({
        id: `user_${Date.now()}`,
        role: 'user',
        content,
        timestamp: new Date(),
      });
      return;
    }

    const streamStartTime = Date.now();
    _chat.addMessage({
      id: `user_${streamStartTime}`,
      role: 'user',
      content,
      timestamp: new Date(streamStartTime),
      optimistic: true,
    });

    const assistantId = `assistant_${Date.now()}`;
    _chat.addMessage({
      id: assistantId,
      role: 'assistant',
      content: '',
      timestamp: new Date(),
      streaming: true,
    });
    set({ isStreaming: true, activeRunId: null });

    try {
      const client = getClient();
      const connectionState = useConnectionStore.getState().connectionState;

      if (connectionState !== 'connected') {
        throw new Error(`Not connected (state: ${connectionState})`);
      }

      let runId = `run_${Date.now()}`;

      if (!useConversationStore.getState().sessionKey) {
        useConversationStore.setState({ sessionKey: effectiveSessionKey });
      }

      const result = await client.chatStream(
        content,
        {
          onDelta: (delta: string) => {
            _chat?.updateMessages(msgs =>
              msgs.map(m =>
                m.id === assistantId
                  ? { ...m, content: m.content + delta }
                  : m
              )
            );
          },
          onThinkingDelta: (delta: string) => {
            _chat?.updateMessages(msgs =>
              msgs.map(m =>
                m.id === assistantId
                  ? { ...m, thinkingContent: (m.thinkingContent || '') + delta }
                  : m
              )
            );
          },
          onTool: (tool: string, input: string, output: string) => {
            if (output) {
              // toolEnd: find the last running step for this tool and complete it
              _chat?.updateMessages(msgs =>
                msgs.map(m => {
                  if (m.id !== assistantId) return m;
                  const steps = [...(m.toolSteps || [])];
                  for (let i = steps.length - 1; i >= 0; i--) {
                    if (steps[i].toolName === tool && steps[i].status === 'running') {
                      steps[i] = { ...steps[i], output, status: 'completed' as const };
                      break;
                    }
                  }
                  return { ...m, toolSteps: steps };
                })
              );

              // Auto-create artifact when file_write tool produces output
              if (tool === 'file_write' && output) {
                try {
                  const parsed = JSON.parse(output);
                  const filePath = parsed?.path || parsed?.file_path || '';
                  const content = parsed?.content || '';
                  if (filePath && content) {
                    const fileName = filePath.split('/').pop() || filePath;
                    const ext = fileName.split('.').pop()?.toLowerCase() || '';
                    const typeMap: Record<string, 'code' | 'markdown' | 'text'> = {
                      ts: 'code', tsx: 'code', js: 'code', jsx: 'code',
                      py: 'code', rs: 'code', go: 'code', java: 'code',
                      md: 'markdown', txt: 'text', json: 'code',
                      html: 'code', css: 'code', sql: 'code', sh: 'code',
                    };
                    const langMap: Record<string, string> = {
                      ts: 'typescript', tsx: 'typescript', js: 'javascript', jsx: 'javascript',
                      py: 'python', rs: 'rust', go: 'go', java: 'java',
                      html: 'html', css: 'css', sql: 'sql', sh: 'bash', json: 'json',
                    };
                    useArtifactStore.getState().addArtifact({
                      id: `artifact_${Date.now()}`,
                      name: fileName,
                      content: typeof content === 'string' ? content : JSON.stringify(content, null, 2),
                      type: typeMap[ext] || 'text',
                      language: langMap[ext],
                      createdAt: new Date(),
                      sourceStepId: assistantId,
                    });
                  }
                } catch { /* non-critical: artifact creation from tool output */ }
              }
            } else {
              // toolStart: create new running step
              const step: ToolCallStep = {
                id: `step_${Date.now()}_${generateRandomString(4)}`,
                toolName: tool,
                input,
                output: '',
                status: 'running',
                timestamp: new Date(),
              };
              _chat?.updateMessages(msgs =>
                msgs.map(m =>
                  m.id === assistantId
                    ? { ...m, toolSteps: [...(m.toolSteps || []), step] }
                    : m
                )
              );
            }
          },
          onHand: (name: string, status: string, result?: unknown) => {
            const handMsg: StreamMsg = {
              id: `hand_${Date.now()}_${generateRandomString(4)}`,
              role: 'hand',
              content: result
                ? (typeof result === 'string' ? result : JSON.stringify(result, null, 2))
                : `Hand: ${name} - ${status}`,
              timestamp: new Date(),
              runId,
              handName: name,
              handStatus: status,
              handResult: result,
            };
            _chat?.updateMessages(msgs => [...msgs, handMsg]);

            if (name === 'speech' && status === 'completed' && result && typeof result === 'object') {
              const res = result as Record<string, unknown>;
              if (res.tts_method === 'browser' && typeof res.text === 'string' && res.text) {
                speechSynth.speak({
                  text: res.text as string,
                  voice: (res.voice as string) || undefined,
                  language: (res.language as string) || undefined,
                  rate: typeof res.rate === 'number' ? res.rate : undefined,
                  pitch: typeof res.pitch === 'number' ? res.pitch : undefined,
                  volume: typeof res.volume === 'number' ? res.volume : undefined,
                }).catch((err: unknown) => {
                  const logger = createLogger('speech-synth');
                  logger.warn('Browser TTS failed', { error: String(err) });
                });
              }
            }
          },
          onSubtaskStatus: (taskId: string, description: string, status: string, detail?: string) => {
            // Map backend status to frontend Subtask status
            const statusMap: Record<string, Subtask['status']> = {
              started: 'pending',
              running: 'in_progress',
              completed: 'completed',
              failed: 'failed',
            };
            const mappedStatus = statusMap[status] || 'in_progress';

            _chat?.updateMessages(msgs =>
              msgs.map(m => {
                if (m.id !== assistantId) return m;
                const subtasks = [...(m.subtasks || [])];
                const existingIdx = subtasks.findIndex(st => st.id === taskId);
                if (existingIdx >= 0) {
                  subtasks[existingIdx] = { ...subtasks[existingIdx], status: mappedStatus, result: detail };
                } else {
                  subtasks.push({
                    id: taskId,
                    description,
                    status: mappedStatus,
                    result: detail,
                  });
                }
                return { ...m, subtasks };
              })
            );
          },
          onComplete: (inputTokens?: number, outputTokens?: number) => {
            const currentMsgs = _chat?.getMessages();

            if (currentMsgs) {
              useConversationStore.getState().upsertActiveConversation(currentMsgs);
            }

            _chat?.updateMessages(msgs =>
              msgs.map(m => {
                if (m.id === assistantId) {
                  return { ...m, streaming: false, runId };
                }
                if (m.optimistic) {
                  return { ...m, optimistic: false };
                }
                return m;
              })
            );
            set({ isStreaming: false, activeRunId: null });

            if (inputTokens !== undefined && outputTokens !== undefined) {
              useMessageStore.getState().addTokenUsage(inputTokens, outputTokens);
              _chat?.setChatStoreState({
                totalInputTokens: useMessageStore.getState().totalInputTokens,
                totalOutputTokens: useMessageStore.getState().totalOutputTokens,
              });
            }

            // Async memory extraction
            const msgs = _chat?.getMessages() || [];
            const filtered = msgs
              .filter(m => m.role === 'user' || m.role === 'assistant')
              .map(m => ({ role: m.role, content: m.content }));
            const convId = useConversationStore.getState().currentConversationId;
            getMemoryExtractor().extractFromConversation(filtered, agentId, convId ?? undefined).catch(err => {
              log.warn('Memory extraction failed:', err);
            });
            intelligenceClient.reflection.recordConversation().catch(err => {
              log.warn('Recording conversation failed:', err);
            });
            intelligenceClient.reflection.shouldReflect().then(shouldReflect => {
              if (shouldReflect) {
                intelligenceClient.reflection.reflect(agentId, []).catch(err => {
                  log.warn('Reflection failed:', err);
                });
              }
            });

            // Follow-up suggestions
            const latestMsgs = _chat?.getMessages() || [];
            const completedMsg = latestMsgs.find(m => m.id === assistantId);
            if (completedMsg?.content) {
              const suggestions = generateFollowUpSuggestions(completedMsg.content);
              if (suggestions.length > 0) {
                get().setSuggestions(suggestions);
              }
            }
          },
          onError: (error: string) => {
            _chat?.updateMessages(msgs =>
              msgs.map(m =>
                m.id === assistantId
                  ? { ...m, content: '', streaming: false, error }
                  : m.role === 'user' && m.optimistic && m.timestamp.getTime() >= streamStartTime
                    ? { ...m, optimistic: false }
                    : m
              )
            );
            set({ isStreaming: false, activeRunId: null });
          },
        },
        {
          sessionKey: effectiveSessionKey,
          agentId: effectiveAgentId,
          thinking_enabled: get().getChatModeConfig().thinking_enabled,
          reasoning_effort: get().getChatModeConfig().reasoning_effort,
          plan_mode: get().getChatModeConfig().plan_mode,
          subagent_enabled: get().getChatModeConfig().subagent_enabled,
        }
      );

      if (result?.runId) {
        runId = result.runId;
        set({ activeRunId: runId });
      }

      if (!sessionKey) {
        useConversationStore.setState({ sessionKey: effectiveSessionKey });
      }

      _chat?.updateMessages(msgs =>
        msgs.map(m =>
          m.id === assistantId ? { ...m, runId } : m
        )
      );
    } catch (err: unknown) {
      const errorMessage = err instanceof Error ? err.message : '无法连接 Gateway';
      _chat?.updateMessages(msgs =>
        msgs.map(m =>
          m.id === assistantId
            ? {
                ...m,
                content: `⚠️ ${errorMessage}`,
                streaming: false,
                error: errorMessage,
              }
            : m.role === 'user' && m.optimistic && m.timestamp.getTime() >= streamStartTime
              ? { ...m, optimistic: false }
              : m
        )
      );
      set({ isStreaming: false, activeRunId: null });
    }
  },

  // ── Cancel Stream ──

  cancelStream: () => {
    if (!_chat) return;
    const { activeRunId, isStreaming } = get();
    if (!isStreaming) return;

    // 1. Tell backend to abort — use sessionKey (which is the sessionId in Tauri)
    try {
      const client = getClient();
      if ('cancelStream' in client) {
        const sessionId = useConversationStore.getState().sessionKey || activeRunId || '';
        (client as { cancelStream: (id: string) => void }).cancelStream(sessionId);
      }
    } catch {
      // Backend cancel is best-effort; proceed with local cleanup
    }

    // 2. Mark the streaming message as cancelled
    _chat.updateMessages(msgs =>
      msgs.map(m => {
        if (m.streaming) {
          return {
            ...m,
            streaming: false,
            error: m.content ? undefined : '已取消',
          };
        }
        if (m.optimistic) {
          return { ...m, optimistic: false };
        }
        return m;
      })
    );

    // 3. Immediately persist the conversation
    const currentMsgs = _chat.getMessages();
    if (currentMsgs) {
      useConversationStore.getState().upsertActiveConversation(currentMsgs);
    }

    // 4. Reset streaming state and clear sessionKey so next send gets a fresh session
    set({ isStreaming: false, activeRunId: null });
    useConversationStore.setState({ sessionKey: null });
    log.info('Stream cancelled by user');
  },

  // ── Agent Stream Listener ──

  initStreamListener: () => {
    const client = getClient();

    if (!('onAgentStream' in client)) {
      return () => {};
    }

    const unsubscribe = client.onAgentStream((delta: AgentStreamDelta) => {
      const msgs = _chat?.getMessages() || [];

      const streamingMsg = [...msgs]
        .reverse()
        .find(m => (
          m.role === 'assistant'
          && m.streaming
          && (
            (delta.runId && m.runId === delta.runId)
            || (!delta.runId && m.runId === null)
          )
        ))
        || [...msgs]
          .reverse()
          .find(m => m.role === 'assistant' && m.streaming);

      if (!streamingMsg) return;

      if (delta.stream === 'assistant' && (delta.delta || delta.content)) {
        _chat?.updateMessages(ms =>
          ms.map(m =>
            m.id === streamingMsg.id
              ? { ...m, content: m.content + (delta.delta || delta.content || '') }
              : m
          )
        );
      } else if (delta.stream === 'tool') {
        if (delta.toolOutput) {
          // toolEnd: find the last running step for this tool and complete it
          _chat?.updateMessages(ms =>
            ms.map(m => {
              if (m.id !== streamingMsg.id) return m;
              const steps = [...(m.toolSteps || [])];
              for (let i = steps.length - 1; i >= 0; i--) {
                if (steps[i].toolName === (delta.tool || 'unknown') && steps[i].status === 'running') {
                  steps[i] = { ...steps[i], output: delta.toolOutput, status: 'completed' as const };
                  break;
                }
              }
              return { ...m, toolSteps: steps };
            })
          );
        } else {
          // toolStart: create new running step
          const step: ToolCallStep = {
            id: `step_${Date.now()}_${generateRandomString(4)}`,
            toolName: delta.tool || 'unknown',
            input: delta.toolInput,
            output: '',
            status: 'running',
            timestamp: new Date(),
          };
          _chat?.updateMessages(ms =>
            ms.map(m =>
              m.id === streamingMsg.id
                ? { ...m, toolSteps: [...(m.toolSteps || []), step] }
                : m
            )
          );
        }
      } else if (delta.stream === 'lifecycle') {
        if (delta.phase === 'end' || delta.phase === 'error') {
          if (delta.phase === 'end') {
            const currentMsgs = _chat?.getMessages();
            if (currentMsgs) {
              useConversationStore.getState().upsertActiveConversation(currentMsgs);
            }
          }
          _chat?.updateMessages(ms =>
            ms.map(m => {
              if (m.id === streamingMsg.id) {
                return {
                  ...m,
                  streaming: false,
                  error: delta.phase === 'error' ? delta.error : undefined,
                };
              }
              if (m.optimistic) {
                return { ...m, optimistic: false };
              }
              return m;
            })
          );
          set({ isStreaming: false, activeRunId: null });

          if (delta.phase === 'end') {
            const latestMsgs = _chat?.getMessages() || [];
            const completedMsg = latestMsgs.find(m => m.id === streamingMsg.id);
            if (completedMsg?.content) {
              const suggestions = generateFollowUpSuggestions(completedMsg.content);
              if (suggestions.length > 0) {
                get().setSuggestions(suggestions);
              }
            }
          }
        }
      } else if (delta.stream === 'hand') {
        const handMsg: StreamMsg = {
          id: `hand_${Date.now()}_${generateRandomString(4)}`,
          role: 'hand',
          content: delta.handResult
            ? (typeof delta.handResult === 'string' ? delta.handResult : JSON.stringify(delta.handResult, null, 2))
            : `Hand: ${delta.handName || 'unknown'} - ${delta.handStatus || 'triggered'}`,
          timestamp: new Date(),
          runId: delta.runId,
          handName: delta.handName,
          handStatus: delta.handStatus,
          handResult: delta.handResult,
        };
        _chat?.updateMessages(ms => [...ms, handMsg]);
      } else if (delta.stream === 'workflow') {
        const workflowMsg: StreamMsg = {
          id: `workflow_${Date.now()}_${generateRandomString(4)}`,
          role: 'workflow',
          content: delta.workflowResult
            ? (typeof delta.workflowResult === 'string' ? delta.workflowResult : JSON.stringify(delta.workflowResult, null, 2))
            : `Workflow: ${delta.workflowId || 'unknown'} step ${delta.workflowStep || '?'} - ${delta.workflowStatus || 'running'}`,
          timestamp: new Date(),
          runId: delta.runId,
          workflowId: delta.workflowId,
          workflowStep: delta.workflowStep,
          workflowStatus: delta.workflowStatus,
          workflowResult: delta.workflowResult,
        };
        _chat?.updateMessages(ms => [...ms, workflowMsg]);
      }
    });

    return unsubscribe;
  },
}),
    {
      name: 'zclaw-stream-storage',
      partialize: (state) => ({
        chatMode: state.chatMode,
      }),
    },
  ),
);