import { desc, eq } from 'drizzle-orm';
import type { Filing } from '@/lib/types';
import { db } from '@/lib/server/db';
import { filing, filingLink } from '@/lib/server/db/schema';

type FilingRow = typeof filing.$inferSelect;

type FilingLinkInput = {
  link_type: string;
  url: string;
};

type UpsertFilingInput = {
  ticker: string;
  filing_type: Filing['filing_type'];
  filing_date: string;
  accession_number: string;
  cik: string;
  company_name: string;
  filing_url: string | null;
  submission_url: string | null;
  primary_document: string | null;
  metrics: Filing['metrics'];
  links: FilingLinkInput[];
};

function toFiling(row: FilingRow): Filing {
  return {
    id: row.id,
    ticker: row.ticker,
    filing_type: row.filing_type,
    filing_date: row.filing_date,
    accession_number: row.accession_number,
    cik: row.cik,
    company_name: row.company_name,
    filing_url: row.filing_url,
    submission_url: row.submission_url,
    primary_document: row.primary_document,
    metrics: row.metrics ?? null,
    analysis: row.analysis ?? null,
    created_at: row.created_at,
    updated_at: row.updated_at
  };
}

function dedupeLinks(links: FilingLinkInput[]) {
  const unique = new Map<string, FilingLinkInput>();

  for (const link of links) {
    const url = link.url.trim();
    if (!url) {
      continue;
    }

    unique.set(`${link.link_type}::${url}`, { ...link, url });
  }

  return [...unique.values()];
}

export async function listFilingsRecords(query?: { ticker?: string; limit?: number }) {
  const safeLimit = Math.min(Math.max(Math.trunc(query?.limit ?? 50), 1), 250);

  const rows = query?.ticker
    ? await db
      .select()
      .from(filing)
      .where(eq(filing.ticker, query.ticker))
      .orderBy(desc(filing.filing_date), desc(filing.updated_at))
      .limit(safeLimit)
    : await db
      .select()
      .from(filing)
      .orderBy(desc(filing.filing_date), desc(filing.updated_at))
      .limit(safeLimit);

  return rows.map(toFiling);
}

export async function getFilingByAccession(accessionNumber: string) {
  const [row] = await db
    .select()
    .from(filing)
    .where(eq(filing.accession_number, accessionNumber))
    .limit(1);

  return row ? toFiling(row) : null;
}

export async function upsertFilingsRecords(items: UpsertFilingInput[]) {
  let inserted = 0;
  let updated = 0;

  for (const item of items) {
    const now = new Date().toISOString();

    const existing = await getFilingByAccession(item.accession_number);

    const [saved] = await db
      .insert(filing)
      .values({
        ticker: item.ticker,
        filing_type: item.filing_type,
        filing_date: item.filing_date,
        accession_number: item.accession_number,
        cik: item.cik,
        company_name: item.company_name,
        filing_url: item.filing_url,
        submission_url: item.submission_url,
        primary_document: item.primary_document,
        metrics: item.metrics,
        analysis: existing?.analysis ?? null,
        created_at: existing?.created_at ?? now,
        updated_at: now
      })
      .onConflictDoUpdate({
        target: filing.accession_number,
        set: {
          ticker: item.ticker,
          filing_type: item.filing_type,
          filing_date: item.filing_date,
          cik: item.cik,
          company_name: item.company_name,
          filing_url: item.filing_url,
          submission_url: item.submission_url,
          primary_document: item.primary_document,
          metrics: item.metrics,
          updated_at: now
        }
      })
      .returning({ id: filing.id });

    const links = dedupeLinks(item.links);

    for (const link of links) {
      await db
        .insert(filingLink)
        .values({
          filing_id: saved.id,
          link_type: link.link_type,
          url: link.url,
          source: 'sec',
          created_at: now
        })
        .onConflictDoNothing();
    }

    if (existing) {
      updated += 1;
    } else {
      inserted += 1;
    }
  }

  return { inserted, updated };
}

export async function saveFilingAnalysis(
  accessionNumber: string,
  analysis: Filing['analysis']
) {
  const [updated] = await db
    .update(filing)
    .set({
      analysis,
      updated_at: new Date().toISOString()
    })
    .where(eq(filing.accession_number, accessionNumber))
    .returning();

  return updated ? toFiling(updated) : null;
}

export async function updateFilingMetricsById(
  filingId: number,
  metrics: Filing['metrics']
) {
  const [updated] = await db
    .update(filing)
    .set({
      metrics,
      updated_at: new Date().toISOString()
    })
    .where(eq(filing.id, filingId))
    .returning();

  return updated ? toFiling(updated) : null;
}