import { edenTreaty } from '@elysiajs/eden';
import type { App } from '@/lib/server/api/app';
import type {
  CompanyAiReportDetail,
  CompanyAnalysis,
  CompanyFinancialStatementsResponse,
  CoveragePriority,
  CoverageStatus,
  Filing,
  FinancialCadence,
  FinancialSurfaceKind,
  Holding,
  PortfolioInsight,
  PortfolioSummary,
  ResearchArtifact,
  ResearchArtifactKind,
  ResearchArtifactSource,
  ResearchJournalEntry,
  ResearchJournalEntryType,
  SearchAnswerResponse,
  SearchResult,
  SearchSource,
  ResearchLibraryResponse,
  ResearchMemo,
  ResearchMemoConviction,
  ResearchMemoEvidenceLink,
  ResearchMemoRating,
  ResearchMemoSection,
  ResearchPacket,
  ResearchWorkspace,
  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;
}

async function requestJson<T>(input: {
  path: string;
  method?: 'GET' | 'POST' | 'PATCH' | 'PUT' | 'DELETE';
  body?: unknown;
}, fallback: string) {
  const response = await fetch(`${API_BASE}${input.path}`, {
    method: input.method ?? 'GET',
    credentials: 'include',
    cache: 'no-store',
    headers: input.body === undefined ? undefined : {
      'content-type': 'application/json'
    },
    body: input.body === undefined ? undefined : JSON.stringify(input.body)
  });

  const payload = await response.json().catch(() => null);
  if (!response.ok) {
    throw new ApiError(
      extractErrorMessage({ value: payload }, fallback),
      response.status
    );
  }

  if (payload === null || payload === undefined) {
    throw new ApiError(fallback, response.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[];
  status?: CoverageStatus;
  priority?: CoveragePriority;
  lastReviewedAt?: string;
}) {
  const result = await client.api.watchlist.post(input);
  return await unwrapData<{ item: WatchlistItem; autoFilingSyncQueued: boolean }>(result, 'Unable to save watchlist item');
}

export async function updateWatchlistItem(id: number, input: {
  companyName?: string;
  sector?: string;
  category?: string;
  tags?: string[];
  status?: CoverageStatus;
  priority?: CoveragePriority;
  lastReviewedAt?: string;
}) {
  return await requestJson<{ item: WatchlistItem; statusChangeJournalCreated: boolean }>({
    path: `/api/watchlist/${id}`,
    method: 'PATCH',
    body: input
  }, 'Unable to update 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 listResearchJournal(ticker: string) {
  const result = await client.api.research.journal.get({
    $query: {
      ticker: ticker.trim().toUpperCase()
    }
  });

  return await unwrapData<{ entries: ResearchJournalEntry[] }>(result, 'Unable to fetch research journal');
}

export async function createResearchJournalEntry(input: {
  ticker: string;
  accessionNumber?: string;
  entryType: ResearchJournalEntryType;
  title?: string;
  bodyMarkdown: string;
  metadata?: Record<string, unknown>;
}) {
  return await requestJson<{ entry: ResearchJournalEntry }>({
    path: '/api/research/journal',
    method: 'POST',
    body: {
      ...input,
      ticker: input.ticker.trim().toUpperCase()
    }
  }, 'Unable to create journal entry');
}

export async function getResearchWorkspace(ticker: string) {
  return await requestJson<{ workspace: ResearchWorkspace }>({
    path: `/api/research/workspace?ticker=${encodeURIComponent(ticker.trim().toUpperCase())}`
  }, 'Unable to fetch research workspace');
}

export async function listResearchLibrary(input: {
  ticker: string;
  q?: string;
  kind?: ResearchArtifactKind;
  tag?: string;
  source?: ResearchArtifactSource;
  linkedToMemo?: boolean;
  limit?: number;
}) {
  const params = new URLSearchParams({
    ticker: input.ticker.trim().toUpperCase()
  });

  if (input.q?.trim()) {
    params.set('q', input.q.trim());
  }

  if (input.kind) {
    params.set('kind', input.kind);
  }

  if (input.tag?.trim()) {
    params.set('tag', input.tag.trim());
  }

  if (input.source) {
    params.set('source', input.source);
  }

  if (input.linkedToMemo !== undefined) {
    params.set('linkedToMemo', input.linkedToMemo ? 'true' : 'false');
  }

  if (typeof input.limit === 'number') {
    params.set('limit', String(input.limit));
  }

  return await requestJson<ResearchLibraryResponse>({
    path: `/api/research/library?${params.toString()}`
  }, 'Unable to fetch research library');
}

export async function createResearchArtifact(input: {
  ticker: string;
  accessionNumber?: string;
  kind: ResearchArtifactKind;
  source?: ResearchArtifactSource;
  subtype?: string;
  title?: string;
  summary?: string;
  bodyMarkdown?: string;
  tags?: string[];
  metadata?: Record<string, unknown>;
}) {
  return await requestJson<{ artifact: ResearchArtifact }>({
    path: '/api/research/library',
    method: 'POST',
    body: {
      ...input,
      ticker: input.ticker.trim().toUpperCase()
    }
  }, 'Unable to create research artifact');
}

export async function updateResearchArtifact(id: number, input: {
  title?: string;
  summary?: string;
  bodyMarkdown?: string;
  tags?: string[];
  metadata?: Record<string, unknown>;
}) {
  return await requestJson<{ artifact: ResearchArtifact }>({
    path: `/api/research/library/${id}`,
    method: 'PATCH',
    body: input
  }, 'Unable to update research artifact');
}

export async function deleteResearchArtifact(id: number) {
  return await requestJson<{ success: boolean }>({
    path: `/api/research/library/${id}`,
    method: 'DELETE'
  }, 'Unable to delete research artifact');
}

export async function uploadResearchArtifact(input: {
  ticker: string;
  file: File;
  title?: string;
  summary?: string;
  tags?: string[];
}) {
  const form = new FormData();
  form.set('ticker', input.ticker.trim().toUpperCase());
  form.set('file', input.file);

  if (input.title?.trim()) {
    form.set('title', input.title.trim());
  }

  if (input.summary?.trim()) {
    form.set('summary', input.summary.trim());
  }

  if (input.tags && input.tags.length > 0) {
    form.set('tags', input.tags.join(','));
  }

  const response = await fetch(`${API_BASE}/api/research/library/upload`, {
    method: 'POST',
    credentials: 'include',
    cache: 'no-store',
    body: form
  });

  const payload = await response.json().catch(() => null);
  if (!response.ok) {
    throw new ApiError(
      extractErrorMessage({ value: payload }, 'Unable to upload research file'),
      response.status
    );
  }

  if (!payload) {
    throw new ApiError('Unable to upload research file', response.status);
  }

  return payload as { artifact: ResearchArtifact };
}

export function getResearchArtifactFileUrl(id: number) {
  return `${API_BASE}/api/research/library/${id}/file`;
}

export async function getResearchMemo(ticker: string) {
  return await requestJson<{ memo: ResearchMemo | null }>({
    path: `/api/research/memo?ticker=${encodeURIComponent(ticker.trim().toUpperCase())}`
  }, 'Unable to fetch research memo');
}

export async function upsertResearchMemo(input: {
  ticker: string;
  rating?: ResearchMemoRating | null;
  conviction?: ResearchMemoConviction | null;
  timeHorizonMonths?: number | null;
  packetTitle?: string;
  packetSubtitle?: string;
  thesisMarkdown?: string;
  variantViewMarkdown?: string;
  catalystsMarkdown?: string;
  risksMarkdown?: string;
  disconfirmingEvidenceMarkdown?: string;
  nextActionsMarkdown?: string;
}) {
  return await requestJson<{ memo: ResearchMemo }>({
    path: '/api/research/memo',
    method: 'PUT',
    body: {
      ...input,
      ticker: input.ticker.trim().toUpperCase()
    }
  }, 'Unable to save research memo');
}

export async function addResearchMemoEvidence(input: {
  memoId: number;
  artifactId: number;
  section: ResearchMemoSection;
  annotation?: string;
  sortOrder?: number;
}) {
  return await requestJson<{ evidence: ResearchMemoEvidenceLink[] }>({
    path: `/api/research/memo/${input.memoId}/evidence`,
    method: 'POST',
    body: {
      artifactId: input.artifactId,
      section: input.section,
      annotation: input.annotation,
      sortOrder: input.sortOrder
    }
  }, 'Unable to attach memo evidence');
}

export async function deleteResearchMemoEvidence(memoId: number, linkId: number) {
  return await requestJson<{ success: boolean }>({
    path: `/api/research/memo/${memoId}/evidence/${linkId}`,
    method: 'DELETE'
  }, 'Unable to delete memo evidence');
}

export async function getResearchPacket(ticker: string) {
  return await requestJson<{ packet: ResearchPacket }>({
    path: `/api/research/packet?ticker=${encodeURIComponent(ticker.trim().toUpperCase())}`
  }, 'Unable to fetch research packet');
}

export async function updateResearchJournalEntry(id: number, input: {
  title?: string;
  bodyMarkdown?: string;
  metadata?: Record<string, unknown>;
}) {
  return await requestJson<{ entry: ResearchJournalEntry }>({
    path: `/api/research/journal/${id}`,
    method: 'PATCH',
    body: input
  }, 'Unable to update journal entry');
}

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

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;
  companyName?: string;
}) {
  const result = await client.api.portfolio.holdings.post(input);
  return await unwrapData<{ holding: Holding }>(result, 'Unable to save holding');
}

export async function updateHolding(id: number, input: {
  shares?: number;
  avgCost?: number;
  currentPrice?: number;
  companyName?: string;
}) {
  const result = await client.api.portfolio.holdings[id].patch(input);
  return await unwrapData<{ holding: Holding }>(result, 'Unable to update 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 searchKnowledge(input: {
  query: string;
  ticker?: string;
  sources?: SearchSource[];
  limit?: number;
}) {
  const result = await client.api.search.get({
    $query: {
      q: input.query.trim(),
      ...(input.ticker?.trim()
        ? { ticker: input.ticker.trim().toUpperCase() }
        : {}),
      ...(input.sources && input.sources.length > 0
        ? { sources: input.sources }
        : {}),
      ...(typeof input.limit === 'number'
        ? { limit: input.limit }
        : {})
    }
  });

  return await unwrapData<{ results: SearchResult[] }>(result, 'Unable to search indexed sources');
}

export async function getSearchAnswer(input: {
  query: string;
  ticker?: string;
  sources?: SearchSource[];
  limit?: number;
}) {
  return await requestJson<SearchAnswerResponse>({
    path: '/api/search/answer',
    method: 'POST',
    body: {
      query: input.query.trim(),
      ...(input.ticker?.trim()
        ? { ticker: input.ticker.trim().toUpperCase() }
        : {}),
      ...(input.sources && input.sources.length > 0
        ? { sources: input.sources }
        : {}),
      ...(typeof input.limit === 'number'
        ? { limit: input.limit }
        : {})
    }
  }, 'Unable to generate cited answer');
}

export async function getCompanyAnalysis(ticker: string, options?: { refresh?: boolean }) {
  const result = await client.api.analysis.company.get({
    $query: {
      ticker: ticker.trim().toUpperCase(),
      ...(options?.refresh ? { refresh: 'true' } : {})
    }
  });

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

export async function getCompanyFinancialStatements(input: {
  ticker: string;
  surfaceKind: FinancialSurfaceKind;
  cadence: FinancialCadence;
  includeDimensions?: boolean;
  includeFacts?: boolean;
  factsCursor?: string | null;
  factsLimit?: number;
  cursor?: string | null;
  limit?: number;
}) {
  const query = {
    ticker: input.ticker.trim().toUpperCase(),
    surface: input.surfaceKind,
    cadence: input.cadence,
    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');
}