import { FastifyInstance } from 'fastify';
import { requireAuth, requirePermission } from '../../middleware/auth';
import { logAudit } from '../../services/audit';
import { success, error, parseId } from '../../utils/response';
import { parsePagination, buildPaginationMeta } from '../../utils/pagination';
import { parseBody } from '../../schemas/common';
import {
  AttendanceNotesSchema,
  AttendanceUpdateAddressSchema,
  AttendanceSwitchProjectSchema,
  AttendanceBalancesSchema,
  AttendanceBulkSchema,
  AttendanceLeaveSchema,
  AttendancePunchSchema,
  CreateAttendanceSchema,
  UpdateAttendanceSchema,
} from '../../schemas/attendance.schema';
import * as attendanceService from '../../services/attendance.service';

export default async function attendanceRoutes(fastify: FastifyInstance): Promise<void> {

  // GET /api/admin/attendance/status — clock-in/out page data
  fastify.get('/status', { preHandler: requireAuth }, async (request, reply) => {
    const authData = request.authData!;
    const data = await attendanceService.getStatus(authData.userId);
    return reply.send({ success: true, data });
  });

  // POST /api/admin/attendance/notes — save shift notes
  fastify.post('/notes', { preHandler: requireAuth }, async (request, reply) => {
    const authData = request.authData!;
    const parsed = parseBody(AttendanceNotesSchema, request.body);
    if ('error' in parsed) return error(reply, parsed.error, 400);
    const body = parsed.data;

    const result = await attendanceService.saveNotes(authData.userId, body.notes ? String(body.notes) : null);
    if ('error' in result) return error(reply, result.error!, 400);
    return success(reply, null, 200, 'Poznámka uložena');
  });

  // POST /api/admin/attendance/update-address — update GPS address after punch
  fastify.post('/update-address', { preHandler: requireAuth }, async (request, reply) => {
    const authData = request.authData!;
    const parsed = parseBody(AttendanceUpdateAddressSchema, request.body);
    if ('error' in parsed) return error(reply, parsed.error, 400);
    const body = parsed.data;

    const result = await attendanceService.updateAddress(authData.userId, body.address ?? null, body.punch_action);
    if ('error' in result) return error(reply, result.error!, 404);
    return success(reply, null, 200, 'Adresa aktualizována');
  });

  // POST /api/admin/attendance/switch-project — switch active project on current shift
  fastify.post('/switch-project', { preHandler: requireAuth }, async (request, reply) => {
    const authData = request.authData!;
    const parsed = parseBody(AttendanceSwitchProjectSchema, request.body);
    if ('error' in parsed) return error(reply, parsed.error, 400);
    const body = parsed.data;

    const newProjectId = body.project_id ? Number(body.project_id) : null;
    const result = await attendanceService.switchProject(authData.userId, newProjectId);
    if ('error' in result) return error(reply, result.error!, 400);
    return success(reply, null, 200, 'Projekt přepnut');
  });

  // GET /api/admin/attendance
  fastify.get('/', { preHandler: requireAuth }, async (request, reply) => {
    const query = request.query as Record<string, unknown>;
    const authData = request.authData!;
    const action = query.action ? String(query.action) : null;

    // --- action=balances: leave balance overview for all users ---
    if (action === 'balances') {
      const yr = Number(query.year) || new Date().getFullYear();
      const data = await attendanceService.getBalances(yr);
      return reply.send({ success: true, data });
    }

    // --- action=workfund: monthly work fund overview ---
    if (action === 'workfund') {
      const yr = Number(query.year) || new Date().getFullYear();
      const data = await attendanceService.getWorkfund(yr);
      return reply.send({ success: true, data });
    }

    // --- action=project_report: monthly project hours ---
    if (action === 'project_report') {
      const yr = Number(query.year) || new Date().getFullYear();
      const data = await attendanceService.getProjectReport(yr);
      return reply.send({ success: true, data });
    }

    // --- action=print: attendance print data for admin ---
    if (action === 'print') {
      if (!authData.permissions.includes('attendance.admin')) {
        return error(reply, 'Nedostatečná oprávnění', 403);
      }

      const monthStr = query.month ? String(query.month) : `${new Date().getFullYear()}-${String(new Date().getMonth() + 1).padStart(2, '0')}`;
      const filterUserId = query.user_id ? Number(query.user_id) : null;
      const data = await attendanceService.getPrintData(monthStr, filterUserId);
      return reply.send({ success: true, data });
    }

    // --- action=projects: active projects for attendance project switching ---
    if (action === 'projects') {
      const data = await attendanceService.getActiveProjects();
      return reply.send({ success: true, data });
    }

    // --- action=project_logs: get project logs for a specific attendance record ---
    if (action === 'project_logs') {
      const attendanceId = Number(query.attendance_id);
      if (!attendanceId) return error(reply, 'Missing attendance_id', 400);
      const data = await attendanceService.getProjectLogs(attendanceId);
      return reply.send({ success: true, data });
    }

    // --- action=location: single record with GPS data ---
    if (action === 'location') {
      const id = Number(query.id);
      if (!id) return error(reply, 'Missing id', 400);
      const record = await attendanceService.getLocationRecord(id);
      if (!record) return error(reply, 'Záznam nenalezen', 404);
      return reply.send({ success: true, data: record });
    }

    // --- Default: paginated records list ---
    const { page, limit, skip, order } = parsePagination(query);
    const isAdmin = authData.permissions.includes('attendance.admin');
    const userId = query.user_id ? Number(query.user_id) : undefined;

    const result = await attendanceService.listAttendance({
      page, limit, skip, order, userId, isAdmin,
      authUserId: authData.userId,
      month: query.month ? Number(query.month) : undefined,
      year: query.year ? Number(query.year) : undefined,
    });

    return reply.send({
      success: true,
      data: result.records,
      pagination: buildPaginationMeta(result.total, result.page, result.limit),
    });
  });

  // POST /api/admin/attendance
  fastify.post('/', { preHandler: requireAuth }, async (request, reply) => {
    const rawBody = request.body as Record<string, unknown>;
    const authData = request.authData!;
    const postQuery = request.query as Record<string, unknown>;

    // --- action=balances: edit or reset leave balance ---
    if (postQuery.action === 'balances') {
      if (!authData.permissions.includes('attendance.balances')) {
        return error(reply, 'Nedostatečná oprávnění', 403);
      }

      const balParsed = parseBody(AttendanceBalancesSchema, rawBody);
      if ('error' in balParsed) return error(reply, balParsed.error, 400);
      const balBody = balParsed.data;

      const result = await attendanceService.handleBalances({
        user_id: balBody.user_id,
        year: balBody.year,
        action_type: balBody.action_type,
        vacation_total: balBody.vacation_total,
        vacation_used: balBody.vacation_used,
        sick_used: balBody.sick_used,
      });

      if ('error' in result) return error(reply, result.error!, 400);

      await logAudit({
        request, authData, action: 'update', entityType: 'leave_balance',
        entityId: balBody.user_id,
        description: result.message.includes('resetována')
          ? `Resetována bilance pro rok ${result.year}`
          : `Upravena bilance dovolené pro rok ${result.year}`,
      });
      return success(reply, null, 200, result.message);
    }

    // --- action=bulk_attendance: bulk fill month ---
    if (postQuery.action === 'bulk_attendance') {
      if (!authData.permissions.includes('attendance.admin')) {
        return error(reply, 'Nedostatečná oprávnění', 403);
      }

      const bulkParsed = parseBody(AttendanceBulkSchema, rawBody);
      if ('error' in bulkParsed) return error(reply, bulkParsed.error, 400);
      const bulkBody = bulkParsed.data;

      const result = await attendanceService.bulkCreateAttendance({
        month: bulkBody.month,
        user_ids: bulkBody.user_ids,
        arrival_time: bulkBody.arrival_time,
        departure_time: bulkBody.departure_time,
        break_start_time: bulkBody.break_start_time,
        break_end_time: bulkBody.break_end_time,
      });

      await logAudit({
        request, authData, action: 'create', entityType: 'attendance',
        entityId: 0, description: `Hromadně vytvořeno ${result.inserted} záznamů docházky pro ${bulkBody.month}`,
      });

      return success(reply, { inserted: result.inserted, skipped: result.skipped }, 200, result.message);
    }

    // --- action=leave: add leave record directly ---
    if (postQuery.action === 'leave') {
      const leaveParsed = parseBody(AttendanceLeaveSchema, rawBody);
      if ('error' in leaveParsed) return error(reply, leaveParsed.error, 400);
      const leaveBody = leaveParsed.data;

      const result = await attendanceService.createLeave({
        user_id: leaveBody.user_id,
        date_from: leaveBody.date_from,
        date_to: leaveBody.date_to,
        leave_type: leaveBody.leave_type,
        leave_hours: leaveBody.leave_hours,
        notes: leaveBody.notes ?? undefined,
      }, authData.userId);

      if ('error' in result) return error(reply, result.error!, 400);
      return success(reply, { created: result.created }, 200, result.message!);
    }

    // Punch action (arrival / departure / break_start) from Dashboard or Attendance page
    if (rawBody.punch_action) {
      const punchParsed = parseBody(AttendancePunchSchema, rawBody);
      if ('error' in punchParsed) return error(reply, punchParsed.error, 400);
      const punchBody = punchParsed.data;

      const result = await attendanceService.punchAction(authData.userId, {
        punch_action: punchBody.punch_action,
        latitude: punchBody.latitude,
        longitude: punchBody.longitude,
        accuracy: punchBody.accuracy,
        address: punchBody.address,
      });

      if ('error' in result) return error(reply, result.error!, 400);

      await logAudit({
        request, authData, action: result.auditAction, entityType: 'attendance',
        entityId: result.id, description: result.auditDescription,
      });
      return success(reply, { id: result.id }, result.status, result.message);
    }

    // Standard attendance record creation (from admin forms)
    const stdParsed = parseBody(CreateAttendanceSchema, rawBody);
    if ('error' in stdParsed) return error(reply, stdParsed.error, 400);
    const body = stdParsed.data;

    const result = await attendanceService.createAttendance({
      user_id: body.user_id,
      shift_date: body.shift_date,
      arrival_time: body.arrival_time,
      arrival_lat: body.arrival_lat,
      arrival_lng: body.arrival_lng,
      arrival_accuracy: body.arrival_accuracy,
      arrival_address: body.arrival_address,
      departure_time: body.departure_time,
      departure_lat: body.departure_lat,
      departure_lng: body.departure_lng,
      departure_accuracy: body.departure_accuracy,
      departure_address: body.departure_address,
      notes: body.notes,
      project_id: body.project_id,
      leave_type: body.leave_type,
      leave_hours: body.leave_hours,
      project_logs: body.project_logs,
    }, authData.userId);

    await logAudit({
      request,
      authData,
      action: 'create',
      entityType: 'attendance',
      entityId: result.id,
      description: `Vytvořen záznam docházky`,
    });

    return success(reply, { id: result.id }, 201, 'Záznam byl vytvořen');
  });

  // PUT /api/admin/attendance/:id
  fastify.put<{ Params: { id: string } }>('/:id', { preHandler: requireAuth }, async (request, reply) => {
    const id = parseId(request.params.id, reply);
    if (id === null) return;
    const parsed = parseBody(UpdateAttendanceSchema, request.body);
    if ('error' in parsed) return error(reply, parsed.error, 400);
    const body = parsed.data;

    const authData = request.authData!;
    const isAdmin = authData.permissions.includes('attendance.admin');

    const result = await attendanceService.updateAttendance(id, {
      arrival_time: body.arrival_time,
      departure_time: body.departure_time,
      break_start: body.break_start,
      break_end: body.break_end,
      notes: body.notes ?? undefined,
      project_id: body.project_id != null ? Number(body.project_id) : (body.project_id as number | null | undefined),
      leave_type: body.leave_type,
      leave_hours: body.leave_hours != null ? Number(body.leave_hours) : (body.leave_hours as number | null | undefined),
      project_logs: body.project_logs,
    }, authData.userId, isAdmin);

    if ('error' in result) return error(reply, result.error!, result.status!);

    await logAudit({
      request,
      authData: request.authData,
      action: 'update',
      entityType: 'attendance',
      entityId: id,
      description: `Upraven záznam docházky`,
    });

    return success(reply, { id }, 200, 'Záznam byl aktualizován');
  });

  // DELETE /api/admin/attendance/:id
  fastify.delete<{ Params: { id: string } }>('/:id', { preHandler: requirePermission('attendance.admin') }, async (request, reply) => {
    const id = parseId(request.params.id, reply);
    if (id === null) return;

    const result = await attendanceService.deleteAttendance(id);
    if ('error' in result) return error(reply, result.error!, 404);

    await logAudit({
      request,
      authData: request.authData,
      action: 'delete',
      entityType: 'attendance',
      entityId: id,
      description: `Smazán záznam docházky`,
    });

    return success(reply, null, 200, 'Záznam smazán');
  });
}