import { create } from 'zustand';
import { invoke } from '@tauri-apps/api/core';

export interface YieldOpportunity {
  id: string;
  name: string;
  protocol: string;
  asset: string;
  apy: number;
  tvl: number;
  riskLevel: 'low' | 'medium' | 'high';
  lockupPeriodDays: number;
  minDeposit: number;
}

export interface YieldPosition {
  id: string;
  opportunityId: string;
  depositedAmount: number;
  currentValue: number;
  rewardsEarned: number;
  autoCompound: boolean;
  createdAt: number;
  lastCompoundAt?: number;
}

interface YieldState {
  opportunities: YieldOpportunity[];
  positions: YieldPosition[];
  isLoading: boolean;
  error: string | null;
}

interface YieldActions {
  loadOpportunities: () => Promise<void>;
  deposit: (opportunityId: string, amount: number, autoCompound: boolean) => Promise<YieldPosition>;
  withdraw: (positionId: string, amount?: number) => Promise<YieldPosition>;
  listPositions: () => Promise<void>;
  compound: (positionId: string) => Promise<YieldPosition>;
  clearError: () => void;
}

// Transform snake_case to camelCase
const transformOpportunity = (data: Record<string, unknown>): YieldOpportunity => ({
  id: data.id as string,
  name: data.name as string,
  protocol: data.protocol as string,
  asset: data.asset as string,
  apy: data.apy as number,
  tvl: data.tvl as number,
  riskLevel: data.risk_level as YieldOpportunity['riskLevel'],
  lockupPeriodDays: data.lockup_period_days as number,
  minDeposit: data.min_deposit as number,
});

const transformPosition = (data: Record<string, unknown>): YieldPosition => ({
  id: data.id as string,
  opportunityId: data.opportunity_id as string,
  depositedAmount: data.deposited_amount as number,
  currentValue: data.current_value as number,
  rewardsEarned: data.rewards_earned as number,
  autoCompound: data.auto_compound as boolean,
  createdAt: data.created_at as number,
  lastCompoundAt: data.last_compound_at as number | undefined,
});

export const useYieldStore = create<YieldState & YieldActions>((set) => ({
  opportunities: [],
  positions: [],
  isLoading: false,
  error: null,

  loadOpportunities: async () => {
    try {
      set({ isLoading: true, error: null });
      const data = await invoke<Record<string, unknown>[]>('yield_get_opportunities');
      const opportunities = data.map(transformOpportunity);
      set({ opportunities, isLoading: false });
    } catch (error) {
      set({ error: String(error), isLoading: false });
    }
  },

  deposit: async (opportunityId: string, amount: number, autoCompound: boolean) => {
    try {
      set({ isLoading: true, error: null });
      const data = await invoke<Record<string, unknown>>('yield_deposit', {
        opportunityId,
        amount,
        autoCompound,
      });
      const position = transformPosition(data);
      set((state) => ({
        positions: [position, ...state.positions],
        isLoading: false,
      }));
      return position;
    } catch (error) {
      set({ error: String(error), isLoading: false });
      throw error;
    }
  },

  withdraw: async (positionId: string, amount?: number) => {
    try {
      set({ isLoading: true, error: null });
      const data = await invoke<Record<string, unknown>>('yield_withdraw', {
        positionId,
        amount,
      });
      const position = transformPosition(data);
      set((state) => ({
        positions: state.positions.map((p) => (p.id === positionId ? position : p)),
        isLoading: false,
      }));
      return position;
    } catch (error) {
      set({ error: String(error), isLoading: false });
      throw error;
    }
  },

  listPositions: async () => {
    try {
      set({ isLoading: true, error: null });
      const data = await invoke<Record<string, unknown>[]>('yield_list_positions');
      const positions = data.map(transformPosition);
      set({ positions, isLoading: false });
    } catch (error) {
      set({ error: String(error), isLoading: false });
    }
  },

  compound: async (positionId: string) => {
    try {
      const data = await invoke<Record<string, unknown>>('yield_compound', { positionId });
      const position = transformPosition(data);
      set((state) => ({
        positions: state.positions.map((p) => (p.id === positionId ? position : p)),
      }));
      return position;
    } catch (error) {
      set({ error: String(error) });
      throw error;
    }
  },

  clearError: () => set({ error: null }),
}));

// Helper to format APY
export const formatAPY = (apy: number): string => `${apy.toFixed(2)}%`;

// Helper to format TVL
export const formatTVL = (sompi: number): string => {
  const syn = sompi / 100_000_000;
  if (syn >= 1_000_000) return `${(syn / 1_000_000).toFixed(2)}M SYN`;
  if (syn >= 1_000) return `${(syn / 1_000).toFixed(2)}K SYN`;
  return `${syn.toFixed(2)} SYN`;
};

// Helper to format sompi to SYN
export const formatAmount = (sompi: number): string => {
  const syn = sompi / 100_000_000;
  return `${syn.toFixed(8)} SYN`;
};