import { Elysia } from 'elysia';
import type { Holding, TaskStatus, WatchlistItem } from '@/lib/types';
import { ensureAuthSchema } from '@/lib/auth';
import { requireAuthenticatedSession } from '@/lib/server/auth-session';
import { asErrorMessage, jsonError } from '@/lib/server/http';
import { buildPortfolioSummary, recalculateHolding } from '@/lib/server/portfolio';
import { getStoreSnapshot, withStore } from '@/lib/server/store';
import { enqueueTask, getTaskById, listRecentTasks } from '@/lib/server/tasks';

const ALLOWED_STATUSES: TaskStatus[] = ['queued', 'running', 'completed', 'failed'];

function nowIso() {
  return new Date().toISOString();
}

function asRecord(value: unknown): Record<string, unknown> {
  if (!value || typeof value !== 'object' || Array.isArray(value)) {
    return {};
  }

  return value as Record<string, unknown>;
}

function asPositiveNumber(value: unknown) {
  const parsed = typeof value === 'number' ? value : Number(value);
  return Number.isFinite(parsed) && parsed > 0 ? parsed : null;
}

async function handleAuthRequest(request: Request) {
  const auth = await ensureAuthSchema();
  return auth.handler(request);
}

export const app = new Elysia({ prefix: '/api' })
  .get('/auth', ({ request }) => handleAuthRequest(request))
  .post('/auth', ({ request }) => handleAuthRequest(request))
  .patch('/auth', ({ request }) => handleAuthRequest(request))
  .put('/auth', ({ request }) => handleAuthRequest(request))
  .delete('/auth', ({ request }) => handleAuthRequest(request))
  .get('/auth/*', ({ request }) => handleAuthRequest(request))
  .post('/auth/*', ({ request }) => handleAuthRequest(request))
  .patch('/auth/*', ({ request }) => handleAuthRequest(request))
  .put('/auth/*', ({ request }) => handleAuthRequest(request))
  .delete('/auth/*', ({ request }) => handleAuthRequest(request))
  .options('/auth', ({ request }) => handleAuthRequest(request))
  .options('/auth/*', ({ request }) => handleAuthRequest(request))
  .get('/health', async () => {
    const snapshot = await getStoreSnapshot();
    const queue = snapshot.tasks.reduce<Record<string, number>>((acc, task) => {
      acc[task.status] = (acc[task.status] ?? 0) + 1;
      return acc;
    }, {});

    return Response.json({
      status: 'ok',
      version: '3.0.0',
      timestamp: new Date().toISOString(),
      queue
    });
  })
  .get('/me', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    return Response.json({
      user: {
        id: session.user.id,
        email: session.user.email,
        name: session.user.name,
        image: session.user.image
      }
    });
  })
  .get('/watchlist', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const snapshot = await getStoreSnapshot();
    const items = snapshot.watchlist
      .filter((item) => item.user_id === session.user.id)
      .slice()
      .sort((a, b) => Date.parse(b.created_at) - Date.parse(a.created_at));

    return Response.json({ items });
  })
  .post('/watchlist', async ({ body }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const payload = asRecord(body);
    const ticker = typeof payload.ticker === 'string' ? payload.ticker.trim().toUpperCase() : '';
    const companyName = typeof payload.companyName === 'string' ? payload.companyName.trim() : '';
    const sector = typeof payload.sector === 'string' ? payload.sector.trim() : '';

    if (!ticker) {
      return jsonError('ticker is required');
    }

    if (!companyName) {
      return jsonError('companyName is required');
    }

    try {
      let item: WatchlistItem | null = null;

      await withStore((store) => {
        const existingIndex = store.watchlist.findIndex((entry) => {
          return entry.user_id === session.user.id && entry.ticker === ticker;
        });

        if (existingIndex >= 0) {
          const existing = store.watchlist[existingIndex];
          const updated: WatchlistItem = {
            ...existing,
            company_name: companyName,
            sector: sector || null
          };

          store.watchlist[existingIndex] = updated;
          item = updated;
          return;
        }

        store.counters.watchlist += 1;
        const created: WatchlistItem = {
          id: store.counters.watchlist,
          user_id: session.user.id,
          ticker,
          company_name: companyName,
          sector: sector || null,
          created_at: nowIso()
        };

        store.watchlist.unshift(created);
        item = created;
      });

      return Response.json({ item });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to create watchlist item'));
    }
  })
  .delete('/watchlist/:id', async ({ params }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const numericId = Number(params.id);
    if (!Number.isInteger(numericId) || numericId <= 0) {
      return jsonError('Invalid watchlist id', 400);
    }

    let removed = false;

    await withStore((store) => {
      const next = store.watchlist.filter((item) => !(item.id === numericId && item.user_id === session.user.id));
      removed = next.length !== store.watchlist.length;
      store.watchlist = next;
    });

    if (!removed) {
      return jsonError('Watchlist item not found', 404);
    }

    return Response.json({ success: true });
  })
  .get('/portfolio/holdings', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const snapshot = await getStoreSnapshot();
    const holdings = snapshot.holdings
      .filter((holding) => holding.user_id === session.user.id)
      .slice()
      .sort((a, b) => Number(b.market_value) - Number(a.market_value));

    return Response.json({ holdings });
  })
  .post('/portfolio/holdings', async ({ body }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const payload = asRecord(body);
    const ticker = typeof payload.ticker === 'string' ? payload.ticker.trim().toUpperCase() : '';
    const shares = asPositiveNumber(payload.shares);
    const avgCost = asPositiveNumber(payload.avgCost);

    if (!ticker) {
      return jsonError('ticker is required');
    }

    if (shares === null) {
      return jsonError('shares must be a positive number');
    }

    if (avgCost === null) {
      return jsonError('avgCost must be a positive number');
    }

    try {
      const now = nowIso();
      let holding: Holding | null = null;

      await withStore((store) => {
        const existingIndex = store.holdings.findIndex((entry) => {
          return entry.user_id === session.user.id && entry.ticker === ticker;
        });

        const currentPrice = asPositiveNumber(payload.currentPrice) ?? avgCost;

        if (existingIndex >= 0) {
          const existing = store.holdings[existingIndex];
          const updated = recalculateHolding({
            ...existing,
            ticker,
            shares: shares.toFixed(6),
            avg_cost: avgCost.toFixed(6),
            current_price: currentPrice.toFixed(6),
            updated_at: now,
            last_price_at: now
          });

          store.holdings[existingIndex] = updated;
          holding = updated;
          return;
        }

        store.counters.holdings += 1;
        const created = recalculateHolding({
          id: store.counters.holdings,
          user_id: session.user.id,
          ticker,
          shares: shares.toFixed(6),
          avg_cost: avgCost.toFixed(6),
          current_price: currentPrice.toFixed(6),
          market_value: '0',
          gain_loss: '0',
          gain_loss_pct: '0',
          last_price_at: now,
          created_at: now,
          updated_at: now
        });

        store.holdings.unshift(created);
        holding = created;
      });

      return Response.json({ holding });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to save holding'));
    }
  })
  .patch('/portfolio/holdings/:id', async ({ params, body }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const numericId = Number(params.id);
    if (!Number.isInteger(numericId) || numericId <= 0) {
      return jsonError('Invalid holding id');
    }

    const payload = asRecord(body);
    let found = false;
    let updated: Holding | null = null;

    await withStore((store) => {
      const index = store.holdings.findIndex((entry) => {
        return entry.id === numericId && entry.user_id === session.user.id;
      });

      if (index < 0) {
        return;
      }

      found = true;
      const existing = store.holdings[index];

      const shares = asPositiveNumber(payload.shares) ?? Number(existing.shares);
      const avgCost = asPositiveNumber(payload.avgCost) ?? Number(existing.avg_cost);
      const currentPrice = asPositiveNumber(payload.currentPrice) ?? Number(existing.current_price ?? existing.avg_cost);

      const next = recalculateHolding({
        ...existing,
        shares: shares.toFixed(6),
        avg_cost: avgCost.toFixed(6),
        current_price: currentPrice.toFixed(6),
        updated_at: nowIso(),
        last_price_at: nowIso()
      });

      store.holdings[index] = next;
      updated = next;
    });

    if (!found) {
      return jsonError('Holding not found', 404);
    }

    return Response.json({ holding: updated });
  })
  .delete('/portfolio/holdings/:id', async ({ params }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const numericId = Number(params.id);
    if (!Number.isInteger(numericId) || numericId <= 0) {
      return jsonError('Invalid holding id');
    }

    let removed = false;

    await withStore((store) => {
      const next = store.holdings.filter((holding) => {
        return !(holding.id === numericId && holding.user_id === session.user.id);
      });
      removed = next.length !== store.holdings.length;
      store.holdings = next;
    });

    if (!removed) {
      return jsonError('Holding not found', 404);
    }

    return Response.json({ success: true });
  })
  .get('/portfolio/summary', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const snapshot = await getStoreSnapshot();
    const summary = buildPortfolioSummary(
      snapshot.holdings.filter((holding) => holding.user_id === session.user.id)
    );

    return Response.json({ summary });
  })
  .post('/portfolio/refresh-prices', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    try {
      const task = await enqueueTask({
        userId: session.user.id,
        taskType: 'refresh_prices',
        payload: {},
        priority: 80
      });

      return Response.json({ task });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to queue refresh task'));
    }
  })
  .post('/portfolio/insights/generate', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    try {
      const task = await enqueueTask({
        userId: session.user.id,
        taskType: 'portfolio_insights',
        payload: {},
        priority: 70
      });

      return Response.json({ task });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to queue insights task'));
    }
  })
  .get('/portfolio/insights/latest', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const snapshot = await getStoreSnapshot();
    const insight = snapshot.insights
      .filter((entry) => entry.user_id === session.user.id)
      .slice()
      .sort((a, b) => Date.parse(b.created_at) - Date.parse(a.created_at))[0] ?? null;

    return Response.json({ insight });
  })
  .get('/filings', async ({ request }) => {
    const { response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const url = new URL(request.url);
    const tickerFilter = url.searchParams.get('ticker')?.trim().toUpperCase();
    const limitValue = Number(url.searchParams.get('limit') ?? 50);
    const limit = Number.isFinite(limitValue)
      ? Math.min(Math.max(Math.trunc(limitValue), 1), 250)
      : 50;

    const snapshot = await getStoreSnapshot();
    const filtered = tickerFilter
      ? snapshot.filings.filter((filing) => filing.ticker === tickerFilter)
      : snapshot.filings;

    const filings = filtered
      .slice()
      .sort((a, b) => Date.parse(b.filing_date) - Date.parse(a.filing_date))
      .slice(0, limit);

    return Response.json({ filings });
  })
  .post('/filings/sync', async ({ body }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const payload = asRecord(body);
    const ticker = typeof payload.ticker === 'string' ? payload.ticker.trim().toUpperCase() : '';

    if (!ticker) {
      return jsonError('ticker is required');
    }

    try {
      const limit = typeof payload.limit === 'number' ? payload.limit : Number(payload.limit);
      const task = await enqueueTask({
        userId: session.user.id,
        taskType: 'sync_filings',
        payload: {
          ticker,
          limit: Number.isFinite(limit) ? limit : 20
        },
        priority: 90
      });

      return Response.json({ task });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to queue filings sync task'));
    }
  })
  .post('/filings/:accessionNumber/analyze', async ({ params }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const accessionNumber = params.accessionNumber?.trim() ?? '';
    if (accessionNumber.length < 4) {
      return jsonError('Invalid accession number');
    }

    try {
      const task = await enqueueTask({
        userId: session.user.id,
        taskType: 'analyze_filing',
        payload: { accessionNumber },
        priority: 65
      });

      return Response.json({ task });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to queue filing analysis task'));
    }
  })
  .get('/tasks', async ({ request }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const url = new URL(request.url);
    const limitValue = Number(url.searchParams.get('limit') ?? 20);
    const limit = Number.isFinite(limitValue)
      ? Math.min(Math.max(Math.trunc(limitValue), 1), 200)
      : 20;

    const rawStatuses = url.searchParams.getAll('status');
    const statuses = rawStatuses.filter((status): status is TaskStatus => {
      return ALLOWED_STATUSES.includes(status as TaskStatus);
    });

    const tasks = await listRecentTasks(
      session.user.id,
      limit,
      statuses.length > 0 ? statuses : undefined
    );

    return Response.json({ tasks });
  })
  .get('/tasks/:taskId', async ({ params }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const task = await getTaskById(params.taskId, session.user.id);
    if (!task) {
      return jsonError('Task not found', 404);
    }

    return Response.json({ task });
  });

export const GET = app.fetch;
export const POST = app.fetch;
export const PATCH = app.fetch;
export const PUT = app.fetch;
export const DELETE = app.fetch;
export const OPTIONS = app.fetch;