/**
 * App-Level State Machine
 *
 * Manages the top-level application state across three main modes:
 * - convo: Active conversation (voice or text)
 * - edit: Editing a node
 * - galaxy: 3D visualization of node graph
 *
 * This machine sits above the conversation machine (which contains voice/text modes).
 * It does NOT duplicate the voice mode logic - that lives in voice-machine.ts.
 */

import { setup, assign } from 'xstate';

export interface NodeDraft {
  title: string;
  content: string;
  conversationContext?: string; // Last N messages as context
}

export interface Node {
  id: string;
  title: string;
  content: string;
  atp_uri?: string;
}

interface AppContext {
  currentNodeId: string | null;
  pendingNodeDraft: NodeDraft | null;
  mode: 'mobile' | 'desktop';
  lastError: string | null;
}

type AppEvent =
  | { type: 'NAVIGATE_TO_CONVO' }
  | { type: 'NAVIGATE_TO_EDIT'; nodeId?: string; draft?: NodeDraft }
  | { type: 'NAVIGATE_TO_GALAXY' }
  | { type: 'CREATE_NODE_FROM_CONVERSATION'; draft: NodeDraft }
  | { type: 'PUBLISH_NODE_SUCCESS'; nodeId: string }
  | { type: 'CANCEL_EDIT' }
  | { type: 'SET_MODE'; mode: 'mobile' | 'desktop' }
  | { type: 'ERROR'; message: string };

export const appMachine = setup({
  types: {
    context: {} as AppContext,
    events: {} as AppEvent,
  },
  actions: {
    setCurrentNode: assign({
      currentNodeId: ({ event }) =>
        event.type === 'NAVIGATE_TO_EDIT' ? event.nodeId || null : null,
    }),
    setPendingDraft: assign({
      pendingNodeDraft: ({ event }) => {
        if (event.type === 'NAVIGATE_TO_EDIT' && event.draft) {
          console.log('[App Machine] Setting pending draft:', event.draft);
          return event.draft;
        }
        if (event.type === 'CREATE_NODE_FROM_CONVERSATION') {
          console.log('[App Machine] Creating node from conversation:', event.draft);
          return event.draft;
        }
        return null;
      },
    }),
    clearDraft: assign({
      pendingNodeDraft: null,
      currentNodeId: null,
    }),
    setPublishedNode: assign({
      currentNodeId: ({ event }) =>
        event.type === 'PUBLISH_NODE_SUCCESS' ? event.nodeId : null,
      pendingNodeDraft: null,
    }),
    setMode: assign({
      mode: ({ event }) => (event.type === 'SET_MODE' ? event.mode : 'desktop'),
    }),
    setError: assign({
      lastError: ({ event }) => (event.type === 'ERROR' ? event.message : null),
    }),
    clearError: assign({
      lastError: null,
    }),
    logTransition: ({ context, event }) => {
      console.log('[App Machine] Event:', event.type);
      console.log('[App Machine] Context:', {
        currentNodeId: context.currentNodeId,
        hasDraft: !!context.pendingNodeDraft,
        mode: context.mode,
      });
    },
  },
}).createMachine({
  id: 'app',
  initial: 'convo',
  context: {
    currentNodeId: null,
    pendingNodeDraft: null,
    mode: 'desktop',
    lastError: null,
  },
  on: {
    SET_MODE: {
      actions: ['setMode', 'logTransition'],
    },
    ERROR: {
      actions: ['setError', 'logTransition'],
    },
  },
  states: {
    convo: {
      tags: ['conversation'],
      entry: ['clearError', 'logTransition'],
      on: {
        NAVIGATE_TO_EDIT: {
          target: 'edit',
          actions: ['setCurrentNode', 'setPendingDraft', 'logTransition'],
        },
        CREATE_NODE_FROM_CONVERSATION: {
          target: 'edit',
          actions: ['setPendingDraft', 'logTransition'],
        },
        NAVIGATE_TO_GALAXY: {
          target: 'galaxy',
          actions: ['logTransition'],
        },
      },
    },

    edit: {
      tags: ['editing'],
      entry: ['clearError', 'logTransition'],
      on: {
        NAVIGATE_TO_CONVO: {
          target: 'convo',
          actions: ['logTransition'],
        },
        NAVIGATE_TO_GALAXY: {
          target: 'galaxy',
          actions: ['logTransition'],
        },
        PUBLISH_NODE_SUCCESS: {
          target: 'galaxy',
          actions: ['setPublishedNode', 'logTransition'],
        },
        CANCEL_EDIT: {
          target: 'convo',
          actions: ['clearDraft', 'logTransition'],
        },
      },
    },

    galaxy: {
      tags: ['visualization'],
      entry: ['clearError', 'logTransition'],
      on: {
        NAVIGATE_TO_CONVO: {
          target: 'convo',
          actions: ['logTransition'],
        },
        NAVIGATE_TO_EDIT: {
          target: 'edit',
          actions: ['setCurrentNode', 'setPendingDraft', 'logTransition'],
        },
      },
    },
  },
});