package dev.dinauer.metrics.service.model;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.persistence.*;
import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;

import java.time.ZonedDateTime;
import java.util.Map;
import java.util.UUID;

@Entity
@Table(name = "collection")
public class Collection
{
    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    @Id
    private String id;

    @Column(nullable = false)
    private String resource;

    @Column(name = "collection_name", nullable = false)
    private String name;

    @Column(nullable = false)
    private String timestamp;

    @Column(name = "unix_timestamp", nullable = false)
    private long unixTimestamp;

    @Enumerated(EnumType.STRING)
    @Column(name = "bucket_unit", nullable = false)
    private BucketUnit bucketUnit;

    @Column(columnDefinition = "text", nullable = false)
    private String metrics;

    @CreationTimestamp
    @Column(name = "created_at", updatable = false)
    private ZonedDateTime createdAt;

    @UpdateTimestamp
    @Column(name = "updated_at")
    private ZonedDateTime updatedAt;

    public Collection()
    {
    }

    public Collection(String resource, String name, String timestamp, long unixTimestamp, BucketUnit bucketUnit)
    {
        this.id = UUID.randomUUID().toString();
        this.resource = resource;
        this.timestamp = timestamp;
        this.unixTimestamp = unixTimestamp;
        this.bucketUnit = bucketUnit;
        this.name = name;
        this.metrics = "{}";
    }

    public String getId()
    {
        return id;
    }

    public void add(String key, double value)
    {
        Map<String, Metric> metrics = getMetrics();
        Metric metric = metrics.get(key);
        if (metric != null)
        {
            metric.add(value);
        }
        else
        {
            Metric newMetric = new Metric();
            newMetric.add(value);
            metrics.put(key, newMetric);
        }
        try
        {
            this.metrics = OBJECT_MAPPER.writeValueAsString(metrics);
        }
        catch (JsonProcessingException e)
        {
            throw new RuntimeException(e);
        }
    }

    private double calculateAverage(long sum, int count)
    {
        if (count == 0)
        {
            return 0;
        }
        return sum * 1.0 / count;
    }

    public String getTimestamp()
    {
        return timestamp;
    }

    public String getName()
    {
        return name;
    }

    public BucketUnit getBucketUnit()
    {
        return bucketUnit;
    }

    public String getResource()
    {
        return resource;
    }

    public Map<String, Metric> getMetrics()
    {
        try
        {
            return OBJECT_MAPPER.readValue(metrics, new TypeReference<Map<String, Metric>>() {});
        }
        catch (JsonProcessingException e)
        {
            throw new RuntimeException(e);
        }
    }

    public long getUnixTimestamp()
    {
        return unixTimestamp;
    }

    public ZonedDateTime getCreatedAt()
    {
        return createdAt;
    }

    public Collection setCreatedAt(ZonedDateTime createdAt)
    {
        this.createdAt = createdAt;
        return this;
    }

    public ZonedDateTime getUpdatedAt()
    {
        return updatedAt;
    }

    public Collection setUpdatedAt(ZonedDateTime updatedAt)
    {
        this.updatedAt = updatedAt;
        return this;
    }
}