/**
 * stores/extensionStore.ts
 *
 * Zustand store with chrome.storage.sync persistence.
 * Cross-context state: popup ↔ background ↔ content scripts
 * all read from / write to chrome.storage.sync, so the store
 * stays in sync across the extension's execution contexts.
 */

import { create } from 'zustand';
import { persist, createJSONStorage } from 'zustand/middleware';

// ── Types ─────────────────────────────────────────────────────────────────────

export type HighlightMode = 'minimal' | 'normal' | 'advanced';

export type WsStatus = 'connected' | 'reconnecting' | 'offline';

export interface AnalysisResult {
  claimHash: string;
  claimText: string;
  color: 'green' | 'yellow' | 'red' | 'purple';
  confidence: number;  // 0-100
  verdict: string;
  explanation: string;
  sources: string[];
  trustScore: number;
  cached: boolean;
  processingMs: number;
}

export interface ExtensionState {
  // User preferences
  enabled: boolean;
  mode: HighlightMode;

  // Connection
  wsStatus: WsStatus;
  backendUrl: string;
  clientId: string;

  // Results cache (in-memory, not persisted)
  results: Record<string, AnalysisResult>;  // keyed by claimHash

  // Stats
  totalAnalyzed: number;
  totalFlagged: number;

  // Actions
  setEnabled: (v: boolean) => void;
  setMode: (m: HighlightMode) => void;
  setWsStatus: (s: WsStatus) => void;
  setBackendUrl: (url: string) => void;
  addResults: (results: AnalysisResult[]) => void;
  clearResults: () => void;
}

// ── chrome.storage.sync adapter for zustand/persist ───────────────────────────
const chromeStorageAdapter = createJSONStorage(() => ({
  getItem: (key: string): Promise<string | null> => {
    return new Promise((resolve) => {
      if (typeof chrome === 'undefined' || !chrome.storage) {
        resolve(localStorage.getItem(key));
        return;
      }
      chrome.storage.sync.get([key], (result) => {
        resolve(result[key] ?? null);
      });
    });
  },
  setItem: (key: string, value: string): Promise<void> => {
    return new Promise((resolve) => {
      if (typeof chrome === 'undefined' || !chrome.storage) {
        localStorage.setItem(key, value);
        resolve();
        return;
      }
      chrome.storage.sync.set({ [key]: value }, resolve);
    });
  },
  removeItem: (key: string): Promise<void> => {
    return new Promise((resolve) => {
      if (typeof chrome === 'undefined' || !chrome.storage) {
        localStorage.removeItem(key);
        resolve();
        return;
      }
      chrome.storage.sync.remove([key], resolve);
    });
  },
}));

// ── Generate stable client ID ─────────────────────────────────────────────────
function generateClientId(): string {
  const arr = new Uint8Array(8);
  crypto.getRandomValues(arr);
  return 'ext-' + Array.from(arr).map(b => b.toString(16).padStart(2, '0')).join('');
}

// ── Store ─────────────────────────────────────────────────────────────────────
export const useExtensionStore = create<ExtensionState>()(
  persist(
    (set, get) => ({
      enabled: true,
      mode: 'normal',
      wsStatus: 'offline',
      backendUrl: import.meta.env.VITE_WS_URL || 'ws://localhost:7860',
      clientId: generateClientId(),
      results: {},
      totalAnalyzed: 0,
      totalFlagged: 0,

      setEnabled: (v) => set({ enabled: v }),
      setMode: (m) => set({ mode: m }),
      setWsStatus: (s) => set({ wsStatus: s }),
      setBackendUrl: (url) => set({ backendUrl: url }),

      addResults: (newResults) => {
        const { results, totalAnalyzed, totalFlagged } = get();
        const updated = { ...results };
        let flaggedDelta = 0;
        for (const r of newResults) {
          updated[r.claimHash] = r;
          if (r.color === 'red' || r.color === 'purple') flaggedDelta++;
        }
        set({
          results: updated,
          totalAnalyzed: totalAnalyzed + newResults.length,
          totalFlagged: totalFlagged + flaggedDelta,
        });
      },

      clearResults: () => set({ results: {}, totalAnalyzed: 0, totalFlagged: 0 }),
    }),
    {
      name: 'fact-engine-store',
      storage: chromeStorageAdapter,
      // Only persist user preferences, not runtime state
      partialize: (state) => ({
        enabled: state.enabled,
        mode: state.mode,
        backendUrl: state.backendUrl,
        clientId: state.clientId,
        totalAnalyzed: state.totalAnalyzed,
        totalFlagged: state.totalFlagged,
      }),
    }
  )
);