package com.example.datacollect.repository;

import com.example.datacollect.model.Article;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

public class ArticleRepository {
    private final List<Article> articles = new ArrayList<>();

    public void add(Article article) {
        if (article == null) {
            throw new IllegalArgumentException("Article cannot be null");
        }
        if (!article.isValid()) {
            throw new IllegalArgumentException("Article must have valid title and url");
        }
        articles.add(article);
    }

    public void addAll(List<Article> articleList) {
        if (articleList == null) {
            throw new IllegalArgumentException("Article list cannot be null");
        }
        for (Article article : articleList) {
            if (article != null && article.isValid()) {
                articles.add(article);
            }
        }
    }

    public void addAll(Article... articles) {
        if (articles == null) {
            throw new IllegalArgumentException("Articles array cannot be null");
        }
        for (Article article : articles) {
            add(article);
        }
    }

    public List<Article> getAll() {
        return Collections.unmodifiableList(articles);
    }

    public Article get(int index) {
        if (index < 0 || index >= articles.size()) {
            throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + articles.size());
        }
        return articles.get(index);
    }

    public Article findById(String url) {
        if (url == null || url.isEmpty()) {
            return null;
        }
        for (Article article : articles) {
            if (url.equals(article.getUrl())) {
                return article;
            }
        }
        return null;
    }

    public List<Article> findByTitle(String keyword) {
        if (keyword == null || keyword.isEmpty()) {
            return Collections.emptyList();
        }
        List<Article> result = new ArrayList<>();
        for (Article article : articles) {
            if (article.getTitle().contains(keyword)) {
                result.add(article);
            }
        }
        return result;
    }

    public boolean remove(Article article) {
        if (article == null) {
            return false;
        }
        return articles.remove(article);
    }

    public boolean removeByUrl(String url) {
        if (url == null || url.isEmpty()) {
            return false;
        }
        for (int i = 0; i < articles.size(); i++) {
            if (url.equals(articles.get(i).getUrl())) {
                articles.remove(i);
                return true;
            }
        }
        return false;
    }

    public void clear() {
        articles.clear();
    }

    public int size() {
        return articles.size();
    }

    public boolean isEmpty() {
        return articles.isEmpty();
    }

    public boolean contains(Article article) {
        return articles.contains(article);
    }

    public boolean containsUrl(String url) {
        if (url == null || url.isEmpty()) {
            return false;
        }
        for (Article article : articles) {
            if (url.equals(article.getUrl())) {
                return true;
            }
        }
        return false;
    }

    @Override
    public String toString() {
        return "ArticleRepository{size=" + articles.size() + "}";
    }

    public String toDetailedString() {
        StringBuilder sb = new StringBuilder();
        sb.append("ArticleRepository{size=").append(articles.size()).append("}\n");
        for (int i = 0; i < articles.size(); i++) {
            sb.append(i + 1).append(". ").append(articles.get(i).toSummary());
        }
        return sb.toString();
    }
}