"use client";

import { create } from "zustand";
import type {
  AutotradeCompiledStrategy,
  AutotradeEngineState,
  AutotradeRuntimeLog,
  AutotradeSessionInfo,
  AutotradeSetupFormValues,
  AutotradeSignalCandidate,
  AutotradeValidationResult,
} from "@/features/autotrade/types/autotrade.types";
import { resolveSetupDefaults } from "@/lib/autotrade/strategy";

interface AutotradeEngineStoreState {
  panelOpen: boolean;
  setupForm: AutotradeSetupFormValues;
  engineState: AutotradeEngineState;
  isWorking: boolean;

  activeSession: AutotradeSessionInfo | null;
  compiledStrategy: AutotradeCompiledStrategy | null;
  validation: AutotradeValidationResult | null;
  lastSignal: AutotradeSignalCandidate | null;

  orderCountToday: number;
  cumulativeLossAmount: number;
  consecutiveFailures: number;
  lastOrderAtBySymbol: Record<string, number>;

  logs: AutotradeRuntimeLog[];
}

interface AutotradeEngineStoreActions {
  setPanelOpen: (open: boolean) => void;
  patchSetupForm: (patch: Partial<AutotradeSetupFormValues>) => void;
  setEngineState: (state: AutotradeEngineState) => void;
  setWorking: (working: boolean) => void;

  setActiveSession: (session: AutotradeSessionInfo | null) => void;
  setCompiledStrategy: (strategy: AutotradeCompiledStrategy | null) => void;
  setValidation: (validation: AutotradeValidationResult | null) => void;
  setLastSignal: (signal: AutotradeSignalCandidate | null) => void;

  increaseOrderCount: (count?: number) => void;
  addLossAmount: (lossAmount: number) => void;
  setLastOrderAt: (symbol: string, timestampMs: number) => void;
  increaseFailure: () => void;
  resetFailure: () => void;

  appendLog: (
    level: AutotradeRuntimeLog["level"],
    message: string,
    options?: {
      stage?: AutotradeRuntimeLog["stage"];
      detail?: string | Record<string, unknown>;
    },
  ) => void;
  clearRuntime: () => void;
}

const INITIAL_FORM = resolveSetupDefaults();

const INITIAL_STATE: AutotradeEngineStoreState = {
  panelOpen: false,
  setupForm: INITIAL_FORM,
  engineState: "IDLE",
  isWorking: false,

  activeSession: null,
  compiledStrategy: null,
  validation: null,
  lastSignal: null,

  orderCountToday: 0,
  cumulativeLossAmount: 0,
  consecutiveFailures: 0,
  lastOrderAtBySymbol: {},

  logs: [],
};

export const useAutotradeEngineStore = create<
  AutotradeEngineStoreState & AutotradeEngineStoreActions
>((set) => ({
  ...INITIAL_STATE,

  setPanelOpen: (open) => {
    set({ panelOpen: open });
  },

  patchSetupForm: (patch) => {
    set((state) => ({
      setupForm: {
        ...state.setupForm,
        ...patch,
      },
    }));
  },

  setEngineState: (engineState) => {
    set({ engineState });
  },

  setWorking: (isWorking) => {
    set({ isWorking });
  },

  setActiveSession: (activeSession) => {
    set({ activeSession });
  },

  setCompiledStrategy: (compiledStrategy) => {
    set({ compiledStrategy });
  },

  setValidation: (validation) => {
    set({ validation });
  },

  setLastSignal: (lastSignal) => {
    set({ lastSignal });
  },

  increaseOrderCount: (count = 1) => {
    set((state) => ({
      orderCountToday: state.orderCountToday + Math.max(1, count),
    }));
  },

  addLossAmount: (lossAmount) => {
    set((state) => ({
      cumulativeLossAmount:
        state.cumulativeLossAmount + Math.max(0, Math.floor(lossAmount)),
    }));
  },

  setLastOrderAt: (symbol, timestampMs) => {
    set((state) => ({
      lastOrderAtBySymbol: {
        ...state.lastOrderAtBySymbol,
        [symbol]: timestampMs,
      },
    }));
  },

  increaseFailure: () => {
    set((state) => ({
      consecutiveFailures: state.consecutiveFailures + 1,
    }));
  },

  resetFailure: () => {
    set({ consecutiveFailures: 0 });
  },

  appendLog: (level, message, options) => {
    const entry: AutotradeRuntimeLog = {
      id: safeLogId(),
      level,
      stage: options?.stage,
      message,
      detail: normalizeLogDetail(options?.detail),
      createdAt: new Date().toISOString(),
    };

    set((state) => ({
      logs: [entry, ...state.logs].slice(0, 80),
    }));
  },

  clearRuntime: () => {
    set((state) => ({
      ...state,
      engineState: "IDLE",
      isWorking: false,
      activeSession: null,
      compiledStrategy: null,
      validation: null,
      lastSignal: null,
      orderCountToday: 0,
      cumulativeLossAmount: 0,
      consecutiveFailures: 0,
      lastOrderAtBySymbol: {},
    }));
  },
}));

function safeLogId() {
  if (typeof crypto !== "undefined" && typeof crypto.randomUUID === "function") {
    return crypto.randomUUID();
  }

  return `autotrade-log-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
}

function normalizeLogDetail(detail: string | Record<string, unknown> | undefined) {
  if (!detail) {
    return undefined;
  }

  if (typeof detail === "string") {
    const cleaned = detail.trim();
    return cleaned.length > 0 ? cleaned : undefined;
  }

  try {
    return JSON.stringify(detail, null, 2);
  } catch {
    return undefined;
  }
}