package com.zy.acs.common.utils;

import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.helpers.FormattingTuple;
import org.slf4j.helpers.MessageFormatter;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * news stories for vincent
 * Created by vincent on 2022/12/22
 */
@Slf4j
public class News {

    private static final int DEFAULT_CAPACITY = 1024;
    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    private static final NewsQueue<NewsDomain> NEWS_QUEUE = new NewsQueue<>(DEFAULT_CAPACITY);

    public static void main(String[] args) {
        News.info("info{}", 1);
        News.warn("warn{}", 2);
        News.error("error{}", 3);
        System.out.println(News.print());
    }

    public static void info(String format, Object... arguments) {
        log.info(format, arguments);
        offer(NewsLevel.INFO, format, arguments);
    }

    public static void warn(String format, Object... arguments) {
        log.warn(format, arguments);
        offer(NewsLevel.WARN, format, arguments);
    }

    public static void error(String format, Object... arguments) {
        log.error(format, arguments);
        offer(NewsLevel.ERROR, format, arguments);
    }

    public static String printStr() {
        StringBuilder sb = new StringBuilder("[");
        List<NewsDomain> domains = NEWS_QUEUE.data();
        for (int i = 0; i < domains.size(); i++) {
            NewsDomain domain = domains.get(i);
            sb.append("{");
            sb.append("\"l\":").append(domain.getLevel().idx).append(",");
            sb.append("\"v\":\"").append(escapeJson(domain.getContent())).append("\"").append(",");
            sb.append("\"t\":\"").append(escapeJson(domain.getDate())).append("\"");
            sb.append("}");
            if (i < domains.size() - 1) {
                sb.append(",");
            }
        }
        sb.append("]");
        return sb.toString();
    }

    public static List<Map<String, Object>> print() {
        List<Map<String, Object>> res = new ArrayList<>();
        for (NewsDomain datum : NEWS_QUEUE.data()) {
            Map<String, Object> map = new HashMap<>();
            map.put("l", datum.getLevel().idx);
            map.put("v", datum.getContent());
            map.put("t", datum.getDate());
            res.add(map);
        }
        return res;
    }

    private static boolean offer(NewsLevel level, String msg, Object[] args) {
        String template = msg == null ? "" : msg;
        FormattingTuple tuple = MessageFormatter.arrayFormat(template, args);
        String formatted = tuple.getMessage();
        return NEWS_QUEUE.offer(new NewsDomain(level, formatted,
                LocalDateTime.now().format(DATE_FORMATTER)));
    }

    private static String escapeJson(String value) {
        if (value == null) {
            return "";
        }
        StringBuilder sb = new StringBuilder(value.length());
        for (char c : value.toCharArray()) {
            switch (c) {
                case '"':
                    sb.append("\\\"");
                    break;
                case '\\':
                    sb.append("\\\\");
                    break;
                case '\n':
                    sb.append("\\n");
                    break;
                case '\r':
                    sb.append("\\r");
                    break;
                case '\t':
                    sb.append("\\t");
                    break;
                default:
                    if (c < 0x20) {
                        sb.append(String.format("\\u%04x", (int) c));
                    } else {
                        sb.append(c);
                    }
            }
        }
        return sb.toString();
    }

    private static final class NewsQueue<T> {

        private final Object[] arr;
        private final int capacity;
        private int head;
        private int size;

        private NewsQueue(int capacity) {
            if (capacity <= 0) {
                throw new IllegalArgumentException("capacity must be > 0");
            }
            this.arr = new Object[capacity];
            this.capacity = capacity;
            this.head = 0;
            this.size = 0;
        }

        public synchronized boolean offer(T t) {
            int writeIndex = (head + size) % capacity;
            arr[writeIndex] = t;
            if (size == capacity) {
                head = (head + 1) % capacity;
            } else {
                size++;
            }
            return true;
        }

        public synchronized List<T> data() {
            List<T> copy = new ArrayList<>(size);
            for (int i = 0; i < size; i++) {
                int idx = (head + i) % capacity;
                @SuppressWarnings("unchecked")
                T element = (T) arr[idx];
                copy.add(element);
            }
            return copy;
        }
    }

    @Data
    static class NewsDomain {
        private final NewsLevel level;
        private final String content;
        private final String date;

        public NewsDomain(NewsLevel level, String content, String date) {
            this.level = level;
            this.content = content;
            this.date = date;
        }

    }

    enum NewsLevel {
        INFO(1),
        WARN(2),
        ERROR(3),
        ;
        public final int idx;
        NewsLevel(int idx) {
            this.idx = idx;
        }
    }

}