import type { FastifyInstance, FastifyRequest } from 'fastify';
import type { AppConfig } from './config.js';
import type { RequestContext } from './core/context.js';
import { newUlid, parseUlid } from './core/ids.js';
import type { IdentityPort } from './core/ports.js';
import { PlatformIdentityAdapter, StandaloneIdentityAdapter } from './adapters/identity.js';
import type { Database } from './infrastructure/database.js';

const datePattern = /^\d{4}-\d{2}-\d{2}$/;

interface AttendanceBody {
  event_id?: string;
  employee_id: string;
  event_type: 'check_in' | 'check_out';
  occurred_at: string;
  source_event_id: string;
  device_id?: string;
}

interface TimesheetBody {
  minutes_worked: number;
  status: 'draft' | 'submitted' | 'approved' | 'rejected';
  note?: string;
}

interface SessionBody {
  access_token: string;
}

const sessionCookieName = '__Host-krona_staff_session';
const sessionMaxAgeSeconds = 8 * 60 * 60;

export async function registerPortalRoutes(
  api: FastifyInstance,
  config: AppConfig,
  database: Database,
) {
  const identity: IdentityPort = config.STAFF_RUNTIME_MODE === 'platform'
    ? new PlatformIdentityAdapter()
    : new StandaloneIdentityAdapter(config);

  api.post<{ Body: SessionBody }>('/session', {
    schema: {
      body: {
        type: 'object', additionalProperties: false,
        required: ['access_token'],
        properties: { access_token: { type: 'string', minLength: 32, maxLength: 4096 } },
      },
    },
  }, async (request, reply) => {
    assertSameOrigin(request);
    if (config.STAFF_RUNTIME_MODE === 'standalone' && !config.STANDALONE_MANAGER_TOKEN) {
      return reply.serviceUnavailable('Вход администратора ещё не настроен.');
    }
    const context = await resolveToken(identity, request.body.access_token, request);
    if (!context.permissions.has('staff:attendance:manage')) {
      return reply.forbidden('Для входа требуется ключ администратора.');
    }
    reply
      .header('cache-control', 'no-store')
      .header('set-cookie', serializeSessionCookie(request.body.access_token, sessionMaxAgeSeconds));
    return { role: 'manager', expires_in: sessionMaxAgeSeconds };
  });

  api.delete('/session', async (request, reply) => {
    assertSameOrigin(request);
    reply
      .header('cache-control', 'no-store')
      .header('set-cookie', serializeSessionCookie('', 0));
    return reply.code(204).send();
  });

  api.get('/portal', async (request, reply) => {
    reply.header('cache-control', 'no-store');
    const context = await resolveContext(identity, request);
    const canManage = context.permissions.has('staff:attendance:manage');
    if (!canManage && !context.permissions.has('staff:attendance:read_own')) {
      return reply.forbidden('Недостаточно прав для просмотра посещаемости.');
    }

    return database.tenantTransaction(context.tenantId, context.actorId, async (client) => {
      const employees = await client.query(
        `SELECT e.id, e.core_user_id, e.personnel_number, e.display_name, e.position, e.gender, e.status
         FROM staff_employees e
         WHERE e.status <> 'dismissed' AND ($1::boolean OR e.core_user_id = $2)
         ORDER BY e.display_name`,
        [canManage, context.actorId],
      );
      const attendance = await client.query(
        `SELECT a.id, a.employee_id, e.display_name, a.event_type, a.source,
                a.occurred_at, a.received_at, a.status
         FROM staff_attendance_events a
         JOIN staff_employees e ON e.tenant_id = a.tenant_id AND e.id = a.employee_id
         WHERE ($1::boolean OR e.core_user_id = $2)
         ORDER BY a.occurred_at DESC LIMIT 100`,
        [canManage, context.actorId],
      );
      const timesheet = await client.query(
        `SELECT t.id, t.employee_id, e.display_name, t.work_date, t.minutes_worked,
                t.status, t.note, t.revision, t.updated_at
         FROM staff_timesheet_entries t
         JOIN staff_employees e ON e.tenant_id = t.tenant_id AND e.id = t.employee_id
         WHERE t.work_date >= (CURRENT_DATE - INTERVAL '40 days')
           AND ($1::boolean OR e.core_user_id = $2)
         ORDER BY t.work_date DESC, e.display_name`,
        [canManage, context.actorId],
      );
      return {
        viewer: { actor_id: context.actorId, role: canManage ? 'manager' : 'employee' },
        employees: employees.rows,
        attendance: attendance.rows,
        timesheet: timesheet.rows,
        refreshed_at: new Date().toISOString(),
      };
    });
  });

  api.post<{ Body: AttendanceBody }>('/attendance/events', {
    schema: {
      body: {
        type: 'object', additionalProperties: false,
        required: ['employee_id', 'event_type', 'occurred_at', 'source_event_id'],
        properties: {
          event_id: { type: 'string', pattern: '^[0-9A-HJKMNP-TV-Z]{26}$' },
          employee_id: { type: 'string', pattern: '^[0-9A-HJKMNP-TV-Z]{26}$' },
          event_type: { enum: ['check_in', 'check_out'] },
          occurred_at: { type: 'string', format: 'date-time' },
          source_event_id: { type: 'string', minLength: 1, maxLength: 200 },
          device_id: { type: 'string', pattern: '^[0-9A-HJKMNP-TV-Z]{26}$' },
        },
      },
    },
  }, async (request, reply) => {
    const context = await requirePermission(identity, request, 'staff:attendance:clock');
    const eventId = request.body.event_id ? parseUlid(request.body.event_id) : newUlid();
    const employeeId = parseUlid(request.body.employee_id);
    const deviceId = request.body.device_id ? parseUlid(request.body.device_id) : null;
    const occurredAt = new Date(request.body.occurred_at);
    if (Number.isNaN(occurredAt.valueOf())) return reply.badRequest('Некорректное время отметки.');
    const now = Date.now();
    if (occurredAt.valueOf() > now + 5 * 60_000 || occurredAt.valueOf() < now - 180 * 86_400_000) {
      return reply.badRequest('Время отметки выходит за допустимый период пилота.');
    }

    const result = await database.tenantTransaction(context.tenantId, context.actorId, async (client) => {
      await client.query(
        `INSERT INTO staff_employees
           (id, tenant_id, personnel_number, display_name, position, gender, status)
         VALUES ($1, $2, $3, $4, '', '', 'active')
         ON CONFLICT (id) DO NOTHING`,
        [employeeId, context.tenantId, `pilot-${employeeId}`, `Сотрудник ${employeeId.slice(-6)}`],
      );
      const inserted = await client.query(
        `INSERT INTO staff_attendance_events
           (id, tenant_id, employee_id, event_type, source, source_event_id,
            occurred_at, device_id, actor_id, correlation_id)
         VALUES ($1, $2, $3, $4, 'terminal', $5, $6, $7, $8, $9)
         ON CONFLICT (tenant_id, source, source_event_id) DO NOTHING RETURNING id`,
        [eventId, context.tenantId, employeeId, request.body.event_type,
          request.body.source_event_id, occurredAt.toISOString(), deviceId,
          context.actorId, context.correlationId],
      );
      if (inserted.rowCount === 0) return { id: eventId, duplicate: true };

      const eventType = request.body.event_type === 'check_in'
        ? 'attendance.clock.in'
        : 'attendance.clock.out';
      await client.query(
        `INSERT INTO staff_outbox
           (id, tenant_id, event_type, event_version, subject_type, subject_id,
            actor_type, actor_id, payload, correlation_id, occurred_at)
         VALUES ($1, $2, $3, 1, 'Employee', $4, 'service', $5, $6, $7, $8)`,
        [newUlid(), context.tenantId, eventType, employeeId, context.actorId,
          { attendance_event_id: eventId, channel: 'platform_notification' },
          context.correlationId, occurredAt.toISOString()],
      );
      return { id: eventId, duplicate: false };
    });
    return reply.code(result.duplicate ? 200 : 201).send(result);
  });

  api.put<{ Params: { employeeId: string; workDate: string }; Body: TimesheetBody }>(
    '/timesheets/:employeeId/:workDate',
    {
      schema: {
        params: { type: 'object', required: ['employeeId', 'workDate'], properties: {
          employeeId: { type: 'string', pattern: '^[0-9A-HJKMNP-TV-Z]{26}$' },
          workDate: { type: 'string', pattern: '^\\d{4}-\\d{2}-\\d{2}$' },
        } },
        body: { type: 'object', additionalProperties: false,
          required: ['minutes_worked', 'status'], properties: {
            minutes_worked: { type: 'integer', minimum: 0, maximum: 1440 },
            status: { enum: ['draft', 'submitted', 'approved', 'rejected'] },
            note: { type: 'string', maxLength: 1000 },
          } },
      },
    },
    async (request, reply) => {
      assertCookieMutationOrigin(request);
      const context = await requirePermission(identity, request, 'staff:attendance:manage');
      if (!datePattern.test(request.params.workDate)) return reply.badRequest('Некорректная дата.');
      const employeeId = parseUlid(request.params.employeeId);
      if (request.body.status === 'approved' && !context.permissions.has('staff:attendance:approve')) {
        return reply.forbidden('Для утверждения табеля требуется отдельное право.');
      }

      const row = await database.tenantTransaction(context.tenantId, context.actorId, async (client) => {
        const saved = await client.query(
          `INSERT INTO staff_timesheet_entries
             (id, tenant_id, employee_id, work_date, minutes_worked, status, note, updated_by)
           VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
           ON CONFLICT (tenant_id, employee_id, work_date) DO UPDATE SET
             minutes_worked = EXCLUDED.minutes_worked, status = EXCLUDED.status,
             note = EXCLUDED.note, revision = staff_timesheet_entries.revision + 1,
             updated_by = EXCLUDED.updated_by, updated_at = now()
           RETURNING id, employee_id, work_date, minutes_worked, status, note, revision, updated_at`,
          [newUlid(), context.tenantId, employeeId, request.params.workDate,
            request.body.minutes_worked, request.body.status, request.body.note ?? '', context.actorId],
        );
        const result = saved.rows[0] as Record<string, unknown>;
        await client.query(
          `INSERT INTO staff_audit_log
             (id, tenant_id, actor_id, action, entity_type, entity_id, new_values, correlation_id)
           VALUES ($1, $2, $3, 'timesheet.entry.saved', 'TimesheetEntry', $4, $5, $6)`,
          [newUlid(), context.tenantId, context.actorId, result.id, result, context.correlationId],
        );
        return result;
      });
      return reply.send(row);
    },
  );
}

async function resolveContext(identity: IdentityPort, request: FastifyRequest): Promise<RequestContext> {
  const authorization = request.headers.authorization;
  const token = authorization?.startsWith('Bearer ')
    ? authorization.slice(7)
    : readCookie(request.headers.cookie, sessionCookieName);
  return resolveToken(identity, token, request);
}

async function resolveToken(
  identity: IdentityPort,
  token: string | undefined,
  request: FastifyRequest,
): Promise<RequestContext> {
  try {
    return await identity.resolve(token, parseUlid(request.id));
  } catch {
    throw request.server.httpErrors.unauthorized('Требуется действующий ключ доступа.');
  }
}

function readCookie(header: string | undefined, name: string): string | undefined {
  if (!header) return undefined;
  for (const part of header.split(';')) {
    const separator = part.indexOf('=');
    if (separator < 0 || part.slice(0, separator).trim() !== name) continue;
    try {
      return decodeURIComponent(part.slice(separator + 1).trim());
    } catch {
      return undefined;
    }
  }
  return undefined;
}

function serializeSessionCookie(value: string, maxAge: number): string {
  return `${sessionCookieName}=${encodeURIComponent(value)}; Path=/; Max-Age=${maxAge}; HttpOnly; Secure; SameSite=Strict`;
}

function assertSameOrigin(request: FastifyRequest) {
  const origin = request.headers.origin;
  if (!origin) return;
  try {
    const parsed = new URL(origin);
    if (parsed.protocol !== 'https:' || parsed.host !== request.headers.host) throw new Error();
  } catch {
    throw request.server.httpErrors.forbidden('Запрос с постороннего сайта отклонён.');
  }
}

function assertCookieMutationOrigin(request: FastifyRequest) {
  if (!request.headers.authorization && readCookie(request.headers.cookie, sessionCookieName)) {
    assertSameOrigin(request);
  }
}

async function requirePermission(identity: IdentityPort, request: FastifyRequest, permission: string) {
  const context = await resolveContext(identity, request);
  if (!context.permissions.has(permission)) {
    throw request.server.httpErrors.forbidden('Недостаточно прав для этой операции.');
  }
  return context;
}