package repositories

import (
	"context"
	"database/sql"

	"github.com/dmitriygnatenko/internal/interfaces"
	"github.com/dmitriygnatenko/internal/models"
)

type articleRepository struct {
	db *sql.DB
}

func InitArticleRepository(db *sql.DB) interfaces.IArticleRepository {
	return articleRepository{db: db}
}

func (a articleRepository) GetAllPreview(ctx context.Context) ([]models.ArticlePreview, error) {
	var res []models.ArticlePreview

	query := "SELECT id, url, publish_time, title, preview_text, image " +
		"FROM " + articleTableName + " " +
		"WHERE is_active = 1 " +
		"ORDER BY publish_time DESC"

	rows, err := a.db.QueryContext(ctx, query)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	for rows.Next() {
		row := models.ArticlePreview{}

		err = rows.Scan(
			&row.ID,
			&row.URL,
			&row.PublishTime,
			&row.Title,
			&row.PreviewText,
			&row.Image,
		)
		if err != nil {
			return nil, err
		}

		res = append(res, row)
	}

	if err = rows.Err(); err != nil {
		return nil, err
	}

	return res, nil
}

func (a articleRepository) GetAll(ctx context.Context) ([]models.Article, error) {
	var res []models.Article

	query := "SELECT id, url, publish_time, title, image, text, preview_text, meta_keywords, meta_desc, is_active " +
		"FROM " + articleTableName + " " +
		"ORDER BY publish_time DESC"

	rows, err := a.db.QueryContext(ctx, query)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	for rows.Next() {
		row := models.Article{}

		err = rows.Scan(&row.ID, &row.URL, &row.PublishTime, &row.Title, &row.Image, &row.Text, &row.PreviewText, &row.MetaKeywords, &row.MetaDescription, &row.IsActive)
		if err != nil {
			return nil, err
		}

		res = append(res, row)
	}

	if err = rows.Err(); err != nil {
		return nil, err
	}

	return res, nil
}

func (a articleRepository) GetPreviewByTagID(ctx context.Context, tagID int) ([]models.ArticlePreview, error) {
	var res []models.ArticlePreview

	query := "SELECT a.id, a.url, a.publish_time, a.title, a.preview_text, a.image " +
		"FROM " + articleTableName + " a, " + articleTagTableName + " at " +
		"WHERE a.is_active = 1 AND at.article_id = a.id AND at.tag_id = ? " +
		"ORDER BY a.publish_time DESC"

	rows, err := a.db.QueryContext(ctx, query, tagID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	for rows.Next() {
		row := models.ArticlePreview{}

		err = rows.Scan(
			&row.ID,
			&row.URL,
			&row.PublishTime,
			&row.Title,
			&row.PreviewText,
			&row.Image,
		)
		if err != nil {
			return nil, err
		}

		res = append(res, row)
	}

	if err = rows.Err(); err != nil {
		return nil, err
	}

	return res, nil
}

func (a articleRepository) GetByURL(ctx context.Context, url string) (*models.Article, error) {
	var res models.Article

	query := "SELECT id, url, publish_time, title, image, text, preview_text, meta_keywords, meta_desc, is_active " +
		"FROM " + articleTableName + " " +
		"WHERE url = ? LIMIT 1"

	err := a.db.QueryRowContext(ctx, query, url).
		Scan(&res.ID, &res.URL, &res.PublishTime, &res.Title, &res.Image, &res.Text, &res.PreviewText, &res.MetaKeywords, &res.MetaDescription, &res.IsActive)

	if err != nil {
		return nil, err
	}

	return &res, nil
}

func (a articleRepository) GetByID(ctx context.Context, id int) (*models.Article, error) {
	var res models.Article

	query := "SELECT id, url, publish_time, title, image, text, preview_text, meta_keywords, meta_desc, is_active " +
		"FROM " + articleTableName + " " +
		"WHERE id = ? LIMIT 1"

	err := a.db.QueryRowContext(ctx, query, id).
		Scan(&res.ID, &res.URL, &res.PublishTime, &res.Title, &res.Image, &res.Text, &res.PreviewText, &res.MetaKeywords, &res.MetaDescription, &res.IsActive)

	if err != nil {
		return nil, err
	}

	return &res, nil
}

func (a articleRepository) Add(ctx context.Context, m models.Article) (int, error) {
	query := "INSERT INTO " + articleTableName + " " +
		"(url, publish_time, title, image, text, preview_text, meta_keywords, meta_desc, is_active) " +
		"VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"

	res, err := a.db.ExecContext(ctx, query, m.URL, m.PublishTime, m.Title, m.Image, m.Text, m.PreviewText, m.MetaKeywords, m.MetaDescription, m.IsActive)
	if err != nil {
		return 0, err
	}

	id, err := res.LastInsertId()
	if err != nil {
		return 0, err
	}

	return int(id), err
}

func (a articleRepository) Update(ctx context.Context, m models.Article) error {
	query := "UPDATE " + articleTableName + " " +
		"SET url = ?, publish_time = ?, title = ?, image = ?, text = ?, preview_text = ?, meta_keywords = ?, " +
		" meta_desc = ?, is_active = ? WHERE id = ?"

	_, err := a.db.ExecContext(ctx, query, m.URL, m.PublishTime, m.Title, m.Image, m.Text, m.PreviewText,
		m.MetaKeywords, m.MetaDescription, m.IsActive, m.ID)

	return err
}