import { edenTreaty } from '@elysiajs/eden';
import type { App } from '@/lib/server/api/app';
import type {
  CompanyAiReportDetail,
  CompanyAnalysis,
  CompanyFinancialStatementsResponse,
  Filing,
  Holding,
  FinancialHistoryWindow,
  FinancialStatementKind,
  PortfolioInsight,
  PortfolioSummary,
  Task,
  TaskStatus,
  TaskTimeline,
  User,
  WatchlistItem
} from './types';
import { resolveApiBaseURL } from './runtime-url';

const API_BASE = resolveApiBaseURL(process.env.NEXT_PUBLIC_API_URL);

const client = edenTreaty<App>(API_BASE, {
  $fetch: {
    credentials: 'include',
    cache: 'no-store'
  }
});

export class ApiError extends Error {
  status: number;

  constructor(message: string, status: number) {
    super(message);
    this.name = 'ApiError';
    this.status = status;
  }
}

function extractErrorMessage(error: unknown, fallback: string) {
  if (!error || typeof error !== 'object') {
    return fallback;
  }

  const candidate = error as {
    value?: unknown;
    message?: string;
  };

  if (typeof candidate.message === 'string' && candidate.message.trim().length > 0) {
    return candidate.message;
  }

  if (candidate.value && typeof candidate.value === 'object') {
    const nested = candidate.value as { error?: unknown; message?: unknown };

    if (typeof nested.error === 'string' && nested.error.trim().length > 0) {
      return nested.error;
    }

    if (typeof nested.message === 'string' && nested.message.trim().length > 0) {
      return nested.message;
    }
  }

  if (typeof candidate.value === 'string' && candidate.value.trim().length > 0) {
    return candidate.value;
  }

  return fallback;
}

type TreatyResult = {
  data: unknown;
  error: unknown;
  status: number;
};

async function unwrapData<T>(result: TreatyResult, fallback: string) {
  if (result.error) {
    throw new ApiError(
      extractErrorMessage(result.error, fallback),
      result.status
    );
  }

  if (result.data === null || result.data === undefined) {
    throw new ApiError(fallback, result.status);
  }

  const payload = result.data instanceof Response
    ? await result.data.json().catch(() => null)
    : result.data;

  if (payload === null || payload === undefined) {
    throw new ApiError(fallback, result.status);
  }

  return payload as T;
}

export async function getMe() {
  const result = await client.api.me.get();
  return await unwrapData<{ user: User }>(result, 'Unable to fetch session');
}

export async function listWatchlist() {
  const result = await client.api.watchlist.get();
  return await unwrapData<{ items: WatchlistItem[] }>(result, 'Unable to fetch watchlist');
}

export async function upsertWatchlistItem(input: {
  ticker: string;
  companyName: string;
  sector?: string;
  category?: string;
  tags?: string[];
}) {
  const result = await client.api.watchlist.post(input);
  return await unwrapData<{ item: WatchlistItem }>(result, 'Unable to save watchlist item');
}

export async function deleteWatchlistItem(id: number) {
  const result = await client.api.watchlist[id].delete();
  return await unwrapData<{ success: boolean }>(result, 'Unable to delete watchlist item');
}

export async function listHoldings() {
  const result = await client.api.portfolio.holdings.get();
  return await unwrapData<{ holdings: Holding[] }>(result, 'Unable to fetch holdings');
}

export async function getPortfolioSummary() {
  const result = await client.api.portfolio.summary.get();
  return await unwrapData<{ summary: PortfolioSummary }>(result, 'Unable to fetch summary');
}

export async function upsertHolding(input: {
  ticker: string;
  shares: number;
  avgCost: number;
  currentPrice?: number;
}) {
  const result = await client.api.portfolio.holdings.post(input);
  return await unwrapData<{ holding: Holding }>(result, 'Unable to save holding');
}

export async function deleteHolding(id: number) {
  const result = await client.api.portfolio.holdings[id].delete();
  return await unwrapData<{ success: boolean }>(result, 'Unable to delete holding');
}

export async function queuePriceRefresh() {
  const result = await client.api.portfolio['refresh-prices'].post();
  return await unwrapData<{ task: Task }>(result, 'Unable to queue price refresh');
}

export async function queuePortfolioInsights() {
  const result = await client.api.portfolio.insights.generate.post();
  return await unwrapData<{ task: Task }>(result, 'Unable to queue portfolio insights');
}

export async function getLatestPortfolioInsight() {
  const result = await client.api.portfolio.insights.latest.get();
  return await unwrapData<{ insight: PortfolioInsight | null }>(result, 'Unable to fetch latest insight');
}

export async function listFilings(query?: { ticker?: string; limit?: number }) {
  const queryParams: {
    ticker?: string;
    limit?: number;
  } = {};

  if (query?.ticker?.trim()) {
    queryParams.ticker = query.ticker.trim().toUpperCase();
  }

  if (query?.limit !== undefined) {
    queryParams.limit = query.limit;
  }

  const result = await client.api.filings.get({
    $query: queryParams
  });

  return await unwrapData<{ filings: Filing[] }>(result, 'Unable to fetch filings');
}

export async function getCompanyAnalysis(ticker: string) {
  const result = await client.api.analysis.company.get({
    $query: {
      ticker: ticker.trim().toUpperCase()
    }
  });

  return await unwrapData<{ analysis: CompanyAnalysis }>(result, 'Unable to fetch company analysis');
}

export async function getCompanyFinancialStatements(input: {
  ticker: string;
  statement: FinancialStatementKind;
  window: FinancialHistoryWindow;
  includeDimensions?: boolean;
  includeFacts?: boolean;
  factsCursor?: string | null;
  factsLimit?: number;
  cursor?: string | null;
  limit?: number;
}) {
  const query = {
    ticker: input.ticker.trim().toUpperCase(),
    statement: input.statement,
    window: input.window,
    includeDimensions: input.includeDimensions ? 'true' : 'false',
    includeFacts: input.includeFacts ? 'true' : 'false',
    ...(typeof input.cursor === 'string' && input.cursor.trim().length > 0
      ? { cursor: input.cursor.trim() }
      : {}),
    ...(typeof input.limit === 'number' && Number.isFinite(input.limit)
      ? { limit: input.limit }
      : {}),
    ...(typeof input.factsCursor === 'string' && input.factsCursor.trim().length > 0
      ? { factsCursor: input.factsCursor.trim() }
      : {}),
    ...(typeof input.factsLimit === 'number' && Number.isFinite(input.factsLimit)
      ? { factsLimit: input.factsLimit }
      : {})
  };

  const result = await client.api.financials.company.get({
    $query: query
  });

  return await unwrapData<{ financials: CompanyFinancialStatementsResponse }>(
    result,
    'Unable to fetch company financial statements'
  );
}

export async function getCompanyAiReport(accessionNumber: string) {
  const normalizedAccession = accessionNumber.trim();

  const result = await client.api.analysis.reports[normalizedAccession].get();
  return await unwrapData<{ report: CompanyAiReportDetail }>(result, 'Unable to fetch AI summary');
}

export async function queueFilingSync(input: {
  ticker: string;
  limit?: number;
  category?: string;
  tags?: string[];
}) {
  const result = await client.api.filings.sync.post(input);
  return await unwrapData<{ task: Task }>(result, 'Unable to queue filing sync');
}

export async function queueFilingAnalysis(accessionNumber: string) {
  const result = await client.api.filings[accessionNumber].analyze.post();
  return await unwrapData<{ task: Task }>(result, 'Unable to queue filing analysis');
}

export async function getTask(taskId: string) {
  const result = await client.api.tasks[taskId].get();
  return await unwrapData<{ task: Task }>(result, 'Unable to fetch task');
}

export async function getTaskTimeline(taskId: string) {
  const result = await client.api.tasks[taskId].timeline.get();
  return await unwrapData<TaskTimeline>(result, 'Unable to fetch task timeline');
}

export async function updateTaskNotificationState(
  taskId: string,
  input: { read?: boolean; silenced?: boolean }
) {
  const result = await client.api.tasks[taskId].notification.patch(input);
  return await unwrapData<{ task: Task }>(result, 'Unable to update task notification state');
}

export async function listRecentTasks(input: {
  limit?: number;
  statuses?: TaskStatus[];
} = {}) {
  const result = await client.api.tasks.get({
    $query: {
      limit: input.limit ?? 20,
      ...(input.statuses && input.statuses.length > 0
        ? { status: input.statuses }
        : {})
    }
  });

  return await unwrapData<{ tasks: Task[] }>(result, 'Unable to fetch tasks');
}