// Fund Market API Client
const API_BASE_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8080/api';

export interface StatsData {
  label: string;
  value: string;
  change: string;
  isPositive: boolean;
}

export interface Product {
  id: number;
  name: string;
  tokenSymbol: string;
  decimals: number;
  contractAddress: string;
  chainId: number;
  token_role: string;
  category: string;
  categoryColor: "blue" | "green" | "orange" | "purple" | "red";
  iconUrl: string;
  yieldAPY: string;
  poolCap: string;
  risk: string;
  riskLevel: 1 | 2 | 3;
  circulatingSupply: string;
  poolCapacityPercent: number;
}

// Fetch all products
// tokenList=true: include stablecoins (for token dropdowns)
// tokenList=false (default): exclude stablecoins (Fund Market page)
export async function fetchProducts(tokenList: boolean = false): Promise<Product[]> {
  try {
    const url = tokenList === true
      ? `${API_BASE_URL}/fundmarket/products?token_list=1`
      : `${API_BASE_URL}/fundmarket/products`;
    const response = await fetch(url, {
      cache: 'no-store',
    });

    if (!response.ok) {
      throw new Error('Failed to fetch products');
    }

    const data = await response.json();
    
    if (!data.success) {
      throw new Error(data.error || 'Failed to fetch products');
    }

    return data.data ?? [];
  } catch (error: unknown) {
    console.error('Error fetching products:', error);
    return [];
  }
}

// Fetch market stats
export async function fetchStats(): Promise<StatsData[]> {
  try {
    const response = await fetch(`${API_BASE_URL}/fundmarket/stats`, {
      cache: 'no-store',
    });

    if (!response.ok) {
      throw new Error('Failed to fetch stats');
    }

    const data = await response.json();
    
    if (!data.success) {
      throw new Error(data.error || 'Failed to fetch stats');
    }

    return data.data;
  } catch (error: unknown) {
    console.error('Error fetching stats:', error);
    return [];
  }
}

// Product Detail Interfaces
export interface ProductDetail {
  // Basic Info
  id: number;
  assetCode: string;
  name: string;
  subtitle: string;
  description: string;
  tokenSymbol: string;
  decimals: number;

  // Investment Parameters
  underlyingAssets: string;
  poolCapUsd: number;
  riskLevel: number;
  riskLabel: string;
  targetApy: number;

  // Contract Info
  contractAddress: string;
  chainId: number;

  // Display Info
  category: string;
  categoryColor: string;
  iconUrl: string;

  // Performance Data
  currentApy: number;
  tvlUsd: number;
  volume24hUsd: number;
  volumeChangeVsAvg: number;
  circulatingSupply: number;
  poolCapacityPercent: number;
  currentPrice: number;

  // Custody Info
  custody?: {
    custodianName: string;
    custodyType: string;
    custodyLocation: string;
    auditorName: string;
    lastAuditDate: string;
    auditReportUrl?: string;
    additionalInfo?: any;
  };

  // Audit Reports
  auditReports: Array<{
    reportType: string;
    reportTitle: string;
    reportDate: string;
    auditorName: string;
    summary: string;
    reportUrl: string;
  }>;

  // Product Links
  productLinks: Array<{
    linkText: string;
    linkUrl: string;
    description: string;
    displayArea: string;  // 'protocol' | 'verification' | 'both'
    displayOrder: number;
  }>;
}

// Fetch single product by ID (simple format)
export async function fetchProductById(id: number): Promise<Product | null> {
  try {
    const response = await fetch(`${API_BASE_URL}/fundmarket/products/${id}`, {
      cache: 'no-store',
    });

    if (!response.ok) {
      throw new Error('Failed to fetch product');
    }

    const data = await response.json();

    if (!data.success) {
      throw new Error(data.error || 'Failed to fetch product');
    }

    return data.data;
  } catch (error: unknown) {
    console.error('Error fetching product:', error);
    return null;
  }
}

// Daily return point
export interface DailyReturnPoint {
  date: string;       // "YYYY-MM-DD"
  ytPrice: number;
  dailyReturn: number; // %
  hasData: boolean;
}

export async function fetchDailyReturns(id: number, year: number, month: number): Promise<DailyReturnPoint[]> {
  try {
    const response = await fetch(
      `${API_BASE_URL}/fundmarket/products/${id}/daily-returns?year=${year}&month=${month}`,
      { cache: 'no-store' }
    );
    if (!response.ok) throw new Error('Failed to fetch daily returns');
    const data = await response.json();
    if (!data.success) throw new Error(data.error || 'Failed to fetch daily returns');
    return data.data ?? [];
  } catch (error: unknown) {
    console.error('Error fetching daily returns:', error);
    return [];
  }
}

// History point for APY/Price chart
export interface HistoryPoint {
  time: string;   // "MM/DD HH:mm"
  apy: number;    // APY %
  price: number;  // YT token price in USDC
}

// Fetch hourly APY/price history for chart
export async function fetchProductHistory(id: number): Promise<HistoryPoint[]> {
  try {
    const response = await fetch(`${API_BASE_URL}/fundmarket/products/${id}/history`, {
      cache: 'no-store',
    });
    if (!response.ok) throw new Error('Failed to fetch history');
    const data = await response.json();
    if (!data.success) throw new Error(data.error || 'Failed to fetch history');
    return data.data ?? [];
  } catch (error: unknown) {
    console.error('Error fetching product history:', error);
    return [];
  }
}

// Fetch product detail by ID (detailed format)
export async function fetchProductDetail(id: number): Promise<ProductDetail | null> {
  try {
    const response = await fetch(`${API_BASE_URL}/fundmarket/products/${id}`, {
      cache: 'no-store',
    });

    if (!response.ok) {
      throw new Error('Failed to fetch product detail');
    }

    const data = await response.json();

    if (!data.success) {
      throw new Error(data.error || 'Failed to fetch product detail');
    }

    return data.data;
  } catch (error: unknown) {
    console.error('Error fetching product detail:', error);
    return null;
  }
}