import fp from 'fastify-plugin';
import { asClass, Lifetime } from 'awilix';
import type { ZodTypeProvider } from 'fastify-type-provider-zod';
import { z } from 'zod/v4';
import {
  CreateRegimenSchema,
  UpdateRegimenSchema,
  RegimenQuerySchema,
  RegimenResponseSchema,
  RegimenListResponseSchema,
  BurnRateResponseSchema,
  type CreateRegimenInput,
  type UpdateRegimenInput,
  type RegimenQueryInput,
} from '@meshitrack/shared';
import { RegimensRepository } from './regimens.repository.js';
import { RegimensService } from './regimens.service.js';
import type { RegimenDocument } from '../../schemas/regimen.schema.js';

interface SerializedRegimenMedication {
  medicineId: string;
  medicineName: string;
  medicineStrength: number;
  medicineStrengthUnit: string;
  medicineForm: string;
  dosage: number;
  dosageUnit: string;
  frequency: string;
  customFrequencyPerDay?: number;
  timeOfDay?: string;
  instructions?: string;
}

interface SerializedRegimenResponse {
  _id: string;
  householdId: string;
  userId: string;
  name: string;
  isActive: boolean;
  medications: SerializedRegimenMedication[];
  createdBy: string;
  createdAt: string;
  updatedAt: string;
}

function toRegimenResponse(doc: RegimenDocument): SerializedRegimenResponse {
  const docAny = doc as unknown as {
    createdAt?: { toISOString?: () => string } | string;
    updatedAt?: { toISOString?: () => string } | string;
  };

  const getIsoStr = (d: { toISOString?: () => string } | string | undefined | null): string => {
    if (!d) return '';
    if (typeof d === 'string') return d;
    if (typeof d.toISOString === 'function') return d.toISOString();
    return String(d);
  };

  return {
    _id: doc._id.toString(),
    householdId: doc.householdId,
    userId: doc.userId,
    name: doc.name,
    isActive: doc.isActive,
    medications: doc.medications.map((med) => {
      const medAny = med as unknown as {
        customFrequencyPerDay?: number | null;
        timeOfDay?: string | null;
        instructions?: string | null;
      };
      const response: SerializedRegimenMedication = {
        medicineId: med.medicineId,
        medicineName: med.medicineName,
        medicineStrength: med.medicineStrength,
        medicineStrengthUnit: med.medicineStrengthUnit,
        medicineForm: med.medicineForm,
        dosage: med.dosage,
        dosageUnit: med.dosageUnit,
        frequency: med.frequency,
      };

      if (medAny.customFrequencyPerDay != null) {
        response.customFrequencyPerDay = medAny.customFrequencyPerDay;
      }
      if (medAny.timeOfDay) {
        response.timeOfDay = medAny.timeOfDay;
      }
      if (medAny.instructions) {
        response.instructions = medAny.instructions;
      }

      return response;
    }),
    createdBy: doc.createdBy,
    createdAt: getIsoStr(docAny.createdAt),
    updatedAt: getIsoStr(docAny.updatedAt),
  };
}

declare module '@fastify/awilix' {
  interface Cradle {
    regimensRepository: RegimensRepository;
    regimensService: RegimensService;
  }
}

export default fp(
  async (fastify) => {
    fastify.diContainer.register({
      regimensRepository: asClass(RegimensRepository, { lifetime: Lifetime.SINGLETON }),
      regimensService: asClass(RegimensService, { lifetime: Lifetime.SINGLETON }),
    });

    const app = fastify.withTypeProvider<ZodTypeProvider>();
    const householdParams = z.object({ householdId: z.string() });

    // GET /api/v1/households/:householdId/regimens — list user's regimens
    app.route({
      method: 'GET',
      url: '/api/v1/households/:householdId/regimens',
      schema: {
        params: householdParams,
        querystring: RegimenQuerySchema,
        response: { 200: RegimenListResponseSchema },
      },
      handler: async (request, reply) => {
        const service = fastify.diContainer.resolve('regimensService');
        const params = request.params as { householdId: string };
        const query = request.query as RegimenQueryInput;
        const result = await service.list(params.householdId, request.user.keycloakId, query);
        return reply.send({
          data: result.data.map(toRegimenResponse),
          pagination: result.pagination,
        });
      },
    });

    // GET /api/v1/households/:householdId/regimens/burn-rate — burn rate + spending projection
    app.route({
      method: 'GET',
      url: '/api/v1/households/:householdId/regimens/burn-rate',
      schema: {
        params: householdParams,
        response: { 200: BurnRateResponseSchema },
      },
      handler: async (request, reply) => {
        const service = fastify.diContainer.resolve('regimensService');
        const params = request.params as { householdId: string };
        const data = await service.calculateBurnRates(params.householdId, request.user.keycloakId);
        return reply.send({ data });
      },
    });

    // GET /api/v1/households/:householdId/regimens/:id — get single regimen
    app.route({
      method: 'GET',
      url: '/api/v1/households/:householdId/regimens/:id',
      schema: {
        params: householdParams.extend({ id: z.string() }),
        response: { 200: RegimenResponseSchema },
      },
      handler: async (request, reply) => {
        const service = fastify.diContainer.resolve('regimensService');
        const params = request.params as { householdId: string; id: string };
        const regimen = await service.getById(
          params.id,
          params.householdId,
          request.user.keycloakId,
        );
        return reply.send(toRegimenResponse(regimen));
      },
    });

    // POST /api/v1/households/:householdId/regimens — create regimen
    app.route({
      method: 'POST',
      url: '/api/v1/households/:householdId/regimens',
      schema: {
        params: householdParams,
        body: CreateRegimenSchema,
        response: { 201: RegimenResponseSchema },
      },
      handler: async (request, reply) => {
        const service = fastify.diContainer.resolve('regimensService');
        const params = request.params as { householdId: string };
        const body = request.body as CreateRegimenInput;
        const regimen = await service.create(body, params.householdId, request.user.keycloakId);
        return reply.status(201).send(toRegimenResponse(regimen));
      },
    });

    // PATCH /api/v1/households/:householdId/regimens/:id — update regimen
    app.route({
      method: 'PATCH',
      url: '/api/v1/households/:householdId/regimens/:id',
      schema: {
        params: householdParams.extend({ id: z.string() }),
        body: UpdateRegimenSchema,
        response: { 200: RegimenResponseSchema },
      },
      handler: async (request, reply) => {
        const service = fastify.diContainer.resolve('regimensService');
        const params = request.params as { householdId: string; id: string };
        const body = request.body as UpdateRegimenInput;
        const regimen = await service.update(
          params.id,
          params.householdId,
          request.user.keycloakId,
          body,
        );
        return reply.send(toRegimenResponse(regimen));
      },
    });

    // DELETE /api/v1/households/:householdId/regimens/:id — delete regimen
    app.route({
      method: 'DELETE',
      url: '/api/v1/households/:householdId/regimens/:id',
      schema: {
        params: householdParams.extend({ id: z.string() }),
        response: { 204: z.undefined() },
      },
      handler: async (request, reply) => {
        const service = fastify.diContainer.resolve('regimensService');
        const params = request.params as { householdId: string; id: string };
        await service.delete(params.id, params.householdId, request.user.keycloakId);
        return reply.status(204).send();
      },
    });
  },
  {
    name: 'regimens-routes',
    dependencies: ['auth-plugin'],
  },
);