import type { FastifyInstance } from 'fastify';
import {
  sendMessageBodySchema,
  editMessageBodySchema,
  reactionBodySchema,
  messageSchema,
  messageListSchema,
  mediaUrlSchema,
  errorSchema,
} from '@altricade/core';
import type { SendMessageBody, EditMessageBody, ReactionBody } from '@altricade/core';

const bearerAuth = [{ bearerAuth: [] }];
const idParamsSchema = {
  type: 'object',
  required: ['id'],
  properties: { id: { type: 'string', format: 'uuid' } },
} as const;
const messageParamsSchema = {
  type: 'object',
  required: ['id', 'messageId'],
  properties: {
    id: { type: 'string', format: 'uuid' },
    messageId: { type: 'string', format: 'uuid' },
  },
} as const;
const reactionParamsSchema = {
  type: 'object',
  required: ['id', 'messageId', 'emoji'],
  properties: {
    id: { type: 'string', format: 'uuid' },
    messageId: { type: 'string', format: 'uuid' },
    emoji: { type: 'string', minLength: 1, maxLength: 32 },
  },
} as const;
const historyQuerySchema = {
  type: 'object',
  properties: {
    before: { type: 'integer', minimum: 1 },
    limit: { type: 'integer', minimum: 1, maximum: 100, default: 50 },
  },
} as const;

export const messagesRoutes = (app: FastifyInstance): Promise<void> => {
  app.get<{ Params: { id: string }; Querystring: { before?: number; limit: number } }>(
    '/conversations/:id/messages',
    {
      schema: {
        tags: ['messages'],
        summary: 'Load conversation message history (newest first)',
        security: bearerAuth,
        params: idParamsSchema,
        querystring: historyQuerySchema,
        response: { 200: messageListSchema, 401: errorSchema, 403: errorSchema },
      },
      preHandler: app.authenticate,
    },
    async (request, reply) => {
      const user = request.authUser;
      if (user === undefined) return reply.code(401).send({ error: 'unauthorized' });
      const before = request.query.before ?? null;
      const history = await app.messagesService.history(
        request.params.id,
        user.id,
        before,
        request.query.limit,
      );
      return reply.send(history);
    },
  );

  app.post<{ Params: { id: string }; Body: SendMessageBody }>(
    '/conversations/:id/messages',
    {
      schema: {
        tags: ['messages'],
        summary: 'Send a message to a conversation',
        security: bearerAuth,
        params: idParamsSchema,
        body: sendMessageBodySchema,
        response: { 200: messageSchema, 201: messageSchema, 401: errorSchema, 403: errorSchema },
      },
      preHandler: app.authenticate,
    },
    async (request, reply) => {
      const user = request.authUser;
      if (user === undefined) return reply.code(401).send({ error: 'unauthorized' });
      const result = await app.messagesService.send(request.params.id, user.id, request.body);
      return reply.code(result.created ? 201 : 200).send(result.message);
    },
  );

  app.patch<{ Params: { id: string; messageId: string }; Body: EditMessageBody }>(
    '/conversations/:id/messages/:messageId',
    {
      schema: {
        tags: ['messages'],
        summary: 'Edit a message (sender only)',
        security: bearerAuth,
        params: messageParamsSchema,
        body: editMessageBodySchema,
        response: { 200: messageSchema, 401: errorSchema, 403: errorSchema, 404: errorSchema },
      },
      preHandler: app.authenticate,
    },
    async (request, reply) => {
      const user = request.authUser;
      if (user === undefined) return reply.code(401).send({ error: 'unauthorized' });
      const message = await app.messagesService.edit(
        request.params.id,
        request.params.messageId,
        user.id,
        request.body.content,
      );
      return reply.send(message);
    },
  );

  app.delete<{ Params: { id: string; messageId: string } }>(
    '/conversations/:id/messages/:messageId',
    {
      schema: {
        tags: ['messages'],
        summary: 'Delete a message (sender only, soft delete)',
        security: bearerAuth,
        params: messageParamsSchema,
        response: { 401: errorSchema, 403: errorSchema, 404: errorSchema },
      },
      preHandler: app.authenticate,
    },
    async (request, reply) => {
      const user = request.authUser;
      if (user === undefined) return reply.code(401).send({ error: 'unauthorized' });
      await app.messagesService.remove(request.params.id, request.params.messageId, user.id);
      return reply.code(204).send();
    },
  );

  app.post<{ Params: { id: string; messageId: string }; Body: ReactionBody }>(
    '/conversations/:id/messages/:messageId/reactions',
    {
      schema: {
        tags: ['messages'],
        summary: 'Add a reaction',
        security: bearerAuth,
        params: messageParamsSchema,
        body: reactionBodySchema,
        response: { 401: errorSchema, 403: errorSchema, 404: errorSchema },
      },
      preHandler: app.authenticate,
    },
    async (request, reply) => {
      const user = request.authUser;
      if (user === undefined) return reply.code(401).send({ error: 'unauthorized' });
      await app.messagesService.addReaction(
        request.params.id,
        request.params.messageId,
        user.id,
        request.body.emoji,
      );
      return reply.code(204).send();
    },
  );

  app.get<{ Params: { id: string; messageId: string } }>(
    '/conversations/:id/messages/:messageId/media-url',
    {
      schema: {
        tags: ['media'],
        summary: 'Get a presigned download URL for a message attachment (member only)',
        security: bearerAuth,
        params: messageParamsSchema,
        response: { 200: mediaUrlSchema, 401: errorSchema, 403: errorSchema, 404: errorSchema },
      },
      preHandler: app.authenticate,
    },
    async (request, reply) => {
      const user = request.authUser;
      if (user === undefined) return reply.code(401).send({ error: 'unauthorized' });
      const url = await app.messagesService.mediaUrl(request.params.id, request.params.messageId, user.id);
      return reply.send({ url });
    },
  );

  app.delete<{ Params: { id: string; messageId: string; emoji: string } }>(
    '/conversations/:id/messages/:messageId/reactions/:emoji',
    {
      schema: {
        tags: ['messages'],
        summary: 'Remove a reaction',
        security: bearerAuth,
        params: reactionParamsSchema,
        response: { 401: errorSchema, 403: errorSchema, 404: errorSchema },
      },
      preHandler: app.authenticate,
    },
    async (request, reply) => {
      const user = request.authUser;
      if (user === undefined) return reply.code(401).send({ error: 'unauthorized' });
      await app.messagesService.removeReaction(
        request.params.id,
        request.params.messageId,
        user.id,
        decodeURIComponent(request.params.emoji),
      );
      return reply.code(204).send();
    },
  );

  return Promise.resolve();
};