package com.mokasz.image_pool.restful.controller;

import com.mokasz.image_pool.algorithm.FeatureExtractor;
import com.mokasz.image_pool.algorithm.OpenCvService;
import com.mokasz.image_pool.restful.entity.ImageQueryResponse;
import com.mokasz.image_pool.restful.entity.ImageSaveResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.sql.ResultSet;
import java.util.List;

@RestController
@RequestMapping("/service/image")
public class ImageController {

  private final Logger logger = LoggerFactory.getLogger(this.getClass());
  private final OpenCvService service = new OpenCvService();
  @Autowired private JdbcTemplate jdbcTemplate;

  @GetMapping("/")
  public ImageSaveResponse index() throws IOException {
    return new ImageSaveResponse("ok", 0);
  }

  @PostMapping("/store2")
  public ImageSaveResponse store2(@RequestParam("file") MultipartFile file) throws IOException {
    FeatureExtractor.compute(file.getBytes());
    return new ImageSaveResponse("OK", 1L);
  }

  @PostMapping("/store")
  public ImageSaveResponse store(
      @RequestParam("file") MultipartFile file, @RequestParam("pool") int pool) throws IOException {
    logger.info("File size: {} Name: {}", file.getSize(), file.getOriginalFilename());
    float[] floats = new float[8];
    service.calculatePHash(file.getBytes(), floats);
    float[] binaries = new float[64];
    service.transformBinaryArray(floats, binaries);
    logger.info("{}", binaries);
    String hash = service.getReadableHash(floats);
    int updated =
        jdbcTemplate.update(
            "INSERT INTO image_pool.image_hash VALUES (?, NOW(), ?) ON CONFLICT (hash) DO NOTHING",
            hash,
            binaries);
    logger.info("{}", updated);
    jdbcTemplate.update(
        "INSERT INTO image_pool.image_to_pool VALUES (?, ?, NOW()) ON CONFLICT (hash, pool_id) DO NOTHING",
        hash,
        pool);
    return new ImageSaveResponse(hash, 1L);
  }

  @PostMapping("/match")
  public List<ImageQueryResponse> match(
      @RequestParam("file") MultipartFile file,
      @RequestParam("pool") int pool,
      @RequestParam(value = "max", defaultValue = "1") float max,
      @RequestParam(value = "min", defaultValue = "1") float min,
      @RequestParam(value = "limit", defaultValue = "10") int limit)
      throws IOException {
    float[] floats = new float[8];
    service.calculatePHash(file.getBytes(), floats);
    float[] binaries = new float[64];
    service.transformBinaryArray(floats, binaries);
    logger.info("{}", floats);
    List<ImageQueryResponse> list =
        jdbcTemplate.query(
            "SELECT * FROM (SELECT hash, (64 - l2_distance(?::FLOAT2[], vector)) / 64 AS similarity FROM image_pool.image_hash WHERE hash IN (SELECT hash FROM image_pool.image_to_pool WHERE pool_id = ?) ORDER BY vector <-> ?::FLOAT2[] ASC) t WHERE similarity >=? and similarity<=? ORDER BY similarity DESC LIMIT ?",
            (ResultSet rs, int rowNum) ->
                new ImageQueryResponse(rs.getFloat("similarity"), rs.getString("hash")),
            binaries,
            pool,
            binaries,
            min,
            max,
            limit);
    return list;
  }
}