import { type FastifyInstance } from 'fastify';
import { parseIdParam } from './helpers';
import {
  createMediaServer,
  getAllMediaServers,
  getMediaServerById,
  updateMediaServer,
  deleteMediaServer,
} from '../../db/repositories/media-server-repository';
import { MediaServerService } from '../../services/media-server';

// ── JSON Schemas for Fastify Validation ──

const createMediaServerBodySchema = {
  type: 'object' as const,
  required: ['name', 'type', 'url', 'token'],
  properties: {
    name: { type: 'string' as const, minLength: 1 },
    type: { type: 'string' as const, enum: ['plex', 'jellyfin'] },
    url: { type: 'string' as const, minLength: 1 },
    token: { type: 'string' as const, minLength: 1 },
    librarySection: { type: 'string' as const, nullable: true },
    enabled: { type: 'boolean' as const },
  },
  additionalProperties: false,
};

const updateMediaServerBodySchema = {
  type: 'object' as const,
  properties: {
    name: { type: 'string' as const, minLength: 1 },
    type: { type: 'string' as const, enum: ['plex', 'jellyfin'] },
    url: { type: 'string' as const, minLength: 1 },
    token: { type: 'string' as const, minLength: 1 },
    librarySection: { type: 'string' as const, nullable: true },
    enabled: { type: 'boolean' as const },
  },
  additionalProperties: false,
};

// ── Helpers ──

/** Redact the token for API responses — show first 4 chars + '…'. */
function redactToken(token: string): string {
  if (token.length <= 4) return '****';
  return token.slice(0, 4) + '****';
}

/** Return a copy of the media server with the token redacted. */
function redactServer<T extends { token: string }>(server: T): T {
  return { ...server, token: redactToken(server.token) };
}

// ── Route Plugin ──

/**
 * Media server CRUD + action route plugin.
 *
 * Registers:
 *   POST   /api/v1/media-servers              — create a media server
 *   GET    /api/v1/media-servers              — list all media servers (redacted tokens)
 *   GET    /api/v1/media-servers/:id          — get a single server (redacted token)
 *   PUT    /api/v1/media-servers/:id          — update server fields
 *   DELETE /api/v1/media-servers/:id          — delete a server
 *   POST   /api/v1/media-servers/:id/test     — test connection
 *   GET    /api/v1/media-servers/:id/sections — list library sections
 */
export async function mediaServerRoutes(fastify: FastifyInstance): Promise<void> {
  const service = new MediaServerService();

  // ── POST /api/v1/media-servers ──

  fastify.post<{
    Body: {
      name: string;
      type: 'plex' | 'jellyfin';
      url: string;
      token: string;
      librarySection?: string | null;
      enabled?: boolean;
    };
  }>(
    '/api/v1/media-servers',
    { schema: { body: createMediaServerBodySchema } },
    async (request, reply) => {
      const server = await createMediaServer(fastify.db, request.body);
      request.log.info(
        { serverId: server.id, name: server.name, type: server.type },
        `[media-server] created server="${server.name}" type=${server.type}`
      );
      return reply.status(201).send(redactServer(server));
    }
  );

  // ── GET /api/v1/media-servers ──

  fastify.get('/api/v1/media-servers', async () => {
    const servers = await getAllMediaServers(fastify.db);
    return servers.map(redactServer);
  });

  // ── GET /api/v1/media-servers/:id ──

  fastify.get<{ Params: { id: string } }>(
    '/api/v1/media-servers/:id',
    async (request, reply) => {
      const id = parseIdParam(request.params.id, reply, 'Media server ID');
      if (id === null) return;

      const server = await getMediaServerById(fastify.db, id);
      if (!server) {
        return reply.status(404).send({
          statusCode: 404,
          error: 'Not Found',
          message: `Media server with ID ${id} not found`,
        });
      }

      return redactServer(server);
    }
  );

  // ── PUT /api/v1/media-servers/:id ──

  fastify.put<{
    Params: { id: string };
    Body: {
      name?: string;
      type?: 'plex' | 'jellyfin';
      url?: string;
      token?: string;
      librarySection?: string | null;
      enabled?: boolean;
    };
  }>(
    '/api/v1/media-servers/:id',
    { schema: { body: updateMediaServerBodySchema } },
    async (request, reply) => {
      const id = parseIdParam(request.params.id, reply, 'Media server ID');
      if (id === null) return;

      const updated = await updateMediaServer(fastify.db, id, request.body);
      if (!updated) {
        return reply.status(404).send({
          statusCode: 404,
          error: 'Not Found',
          message: `Media server with ID ${id} not found`,
        });
      }

      request.log.info(
        { serverId: id, fields: Object.keys(request.body) },
        `[media-server] updated server=${id}`
      );
      return redactServer(updated);
    }
  );

  // ── DELETE /api/v1/media-servers/:id ──

  fastify.delete<{ Params: { id: string } }>(
    '/api/v1/media-servers/:id',
    async (request, reply) => {
      const id = parseIdParam(request.params.id, reply, 'Media server ID');
      if (id === null) return;

      const deleted = await deleteMediaServer(fastify.db, id);
      if (!deleted) {
        return reply.status(404).send({
          statusCode: 404,
          error: 'Not Found',
          message: `Media server with ID ${id} not found`,
        });
      }

      request.log.info({ serverId: id }, `[media-server] deleted server=${id}`);
      return reply.status(204).send();
    }
  );

  // ── POST /api/v1/media-servers/:id/test ──

  fastify.post<{ Params: { id: string } }>(
    '/api/v1/media-servers/:id/test',
    async (request, reply) => {
      const id = parseIdParam(request.params.id, reply, 'Media server ID');
      if (id === null) return;

      const server = await getMediaServerById(fastify.db, id);
      if (!server) {
        return reply.status(404).send({
          statusCode: 404,
          error: 'Not Found',
          message: `Media server with ID ${id} not found`,
        });
      }

      const result = await service.testConnection(server);
      return reply.send(result);
    }
  );

  // ── GET /api/v1/media-servers/:id/sections ──

  fastify.get<{ Params: { id: string } }>(
    '/api/v1/media-servers/:id/sections',
    async (request, reply) => {
      const id = parseIdParam(request.params.id, reply, 'Media server ID');
      if (id === null) return;

      const server = await getMediaServerById(fastify.db, id);
      if (!server) {
        return reply.status(404).send({
          statusCode: 404,
          error: 'Not Found',
          message: `Media server with ID ${id} not found`,
        });
      }

      const sections = await service.listLibrarySections(server);
      return reply.send(sections);
    }
  );
}