import { Elysia, t } from 'elysia';
import type { TaskStatus } from '@/lib/types';
import { auth } from '@/lib/auth';
import { requireAuthenticatedSession } from '@/lib/server/auth-session';
import { asErrorMessage, jsonError } from '@/lib/server/http';
import { buildPortfolioSummary } from '@/lib/server/portfolio';
import { listFilingsRecords } from '@/lib/server/repos/filings';
import {
  deleteHoldingByIdRecord,
  listUserHoldings,
  updateHoldingByIdRecord,
  upsertHoldingRecord
} from '@/lib/server/repos/holdings';
import { getLatestPortfolioInsight } from '@/lib/server/repos/insights';
import {
  deleteWatchlistItemRecord,
  listWatchlistItems,
  upsertWatchlistItemRecord
} from '@/lib/server/repos/watchlist';
import {
  enqueueTask,
  getTaskById,
  getTaskQueueSnapshot,
  listRecentTasks
} from '@/lib/server/tasks';

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

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;
}

const authHandler = ({ request }: { request: Request }) => auth.handler(request);

export const app = new Elysia({ prefix: '/api' })
  .all('/auth', authHandler)
  .all('/auth/*', authHandler)
  .get('/health', async () => {
    const queue = await getTaskQueueSnapshot();

    return Response.json({
      status: 'ok',
      version: '4.0.0',
      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 items = await listWatchlistItems(session.user.id);
    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 {
      const item = await upsertWatchlistItemRecord({
        userId: session.user.id,
        ticker,
        companyName,
        sector
      });

      return Response.json({ item });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to create watchlist item'));
    }
  }, {
    body: t.Object({
      ticker: t.String({ minLength: 1 }),
      companyName: t.String({ minLength: 1 }),
      sector: t.Optional(t.String())
    })
  })
  .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);
    }

    const removed = await deleteWatchlistItemRecord(session.user.id, numericId);

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

    return Response.json({ success: true });
  }, {
    params: t.Object({
      id: t.String({ minLength: 1 })
    })
  })
  .get('/portfolio/holdings', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const holdings = await listUserHoldings(session.user.id);

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

      const holding = await upsertHoldingRecord({
        userId: session.user.id,
        ticker,
        shares,
        avgCost,
        currentPrice
      });

      return Response.json({ holding });
    } catch (error) {
      return jsonError(asErrorMessage(error, 'Failed to save holding'));
    }
  }, {
    body: t.Object({
      ticker: t.String({ minLength: 1 }),
      shares: t.Number({ exclusiveMinimum: 0 }),
      avgCost: t.Number({ exclusiveMinimum: 0 }),
      currentPrice: t.Optional(t.Number({ exclusiveMinimum: 0 }))
    })
  })
  .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);

    const updated = await updateHoldingByIdRecord({
      userId: session.user.id,
      id: numericId,
      shares: asPositiveNumber(payload.shares) ?? undefined,
      avgCost: asPositiveNumber(payload.avgCost) ?? undefined,
      currentPrice: asPositiveNumber(payload.currentPrice) ?? undefined
    });

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

    return Response.json({ holding: updated });
  }, {
    params: t.Object({
      id: t.String({ minLength: 1 })
    }),
    body: t.Object({
      shares: t.Optional(t.Number({ exclusiveMinimum: 0 })),
      avgCost: t.Optional(t.Number({ exclusiveMinimum: 0 })),
      currentPrice: t.Optional(t.Number({ exclusiveMinimum: 0 }))
    })
  })
  .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');
    }

    const removed = await deleteHoldingByIdRecord(session.user.id, numericId);

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

    return Response.json({ success: true });
  }, {
    params: t.Object({
      id: t.String({ minLength: 1 })
    })
  })
  .get('/portfolio/summary', async () => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const holdings = await listUserHoldings(session.user.id);
    const summary = buildPortfolioSummary(holdings);

    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 insight = await getLatestPortfolioInsight(session.user.id);

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

    const tickerFilter = typeof query.ticker === 'string'
      ? query.ticker.trim().toUpperCase()
      : undefined;

    const limit = typeof query.limit === 'number'
      ? query.limit
      : Number(query.limit);

    const filings = await listFilingsRecords({
      ticker: tickerFilter,
      limit: Number.isFinite(limit) ? limit : 50
    });

    return Response.json({ filings });
  }, {
    query: t.Object({
      ticker: t.Optional(t.String()),
      limit: t.Optional(t.Numeric())
    })
  })
  .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'));
    }
  }, {
    body: t.Object({
      ticker: t.String({ minLength: 1 }),
      limit: t.Optional(t.Numeric())
    })
  })
  .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'));
    }
  }, {
    params: t.Object({
      accessionNumber: t.String({ minLength: 4 })
    })
  })
  .get('/tasks', async ({ query }) => {
    const { session, response } = await requireAuthenticatedSession();
    if (response) {
      return response;
    }

    const limit = typeof query.limit === 'number'
      ? query.limit
      : Number(query.limit ?? 20);

    const statusInput = query.status;

    const rawStatuses = Array.isArray(statusInput)
      ? statusInput
      : statusInput
        ? [statusInput]
        : [];

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

    const tasks = await listRecentTasks(
      session.user.id,
      Number.isFinite(limit) ? limit : 20,
      statuses.length > 0 ? statuses : undefined
    );

    return Response.json({ tasks });
  }, {
    query: t.Object({
      limit: t.Optional(t.Numeric()),
      status: t.Optional(t.Union([t.String(), t.Array(t.String())]))
    })
  })
  .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 });
  }, {
    params: t.Object({
      taskId: t.String({ minLength: 1 })
    })
  });

export type App = typeof app;