package repositories

import (
	"context"
	"fmt"

	sq "github.com/Masterminds/squirrel"

	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/models"
)

const articleTableName = "article"

var articleTableColumns = []string{
	"id",
	"url",
	"publish_time",
	"title",
	"image",
	"text",
	"preview_text",
	"meta_keywords",
	"meta_desc",
	"is_active",
}

type ArticleRepository struct {
	db DB
}

func InitArticleRepository(db DB) *ArticleRepository {
	return &ArticleRepository{db: db}
}

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

	q, v, err := sq.Select("id", "url", "publish_time", "title", "preview_text", "image").
		From(articleTableName).
		PlaceholderFormat(sq.Dollar).
		Where(sq.Eq{"is_active": true}).
		OrderBy("publish_time DESC").
		ToSql()

	if err != nil {
		return nil, fmt.Errorf("build query: %w", err)
	}

	err = a.db.SelectContext(ctx, &res, q, v...)
	if err != nil {
		return nil, fmt.Errorf("select: %w", err)
	}

	return res, nil
}

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

	q, v, err := sq.Select(articleTableColumns...).
		From(articleTableName).
		OrderBy("publish_time DESC").
		ToSql()

	if err != nil {
		return nil, fmt.Errorf("build query: %w", err)
	}

	err = a.db.SelectContext(ctx, &res, q, v...)
	if err != nil {
		return nil, fmt.Errorf("select: %w", err)
	}

	return res, nil
}

func (a ArticleRepository) GetPreviewByTagID(ctx context.Context, tagID uint64) ([]models.ArticlePreview, error) {
	var res []models.ArticlePreview

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

	err := a.db.SelectContext(ctx, &res, q, tagID)
	if err != nil {
		return nil, fmt.Errorf("select: %w", err)
	}

	return res, nil
}

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

	q, v, err := sq.Select(articleTableColumns...).
		From(articleTableName).
		PlaceholderFormat(sq.Dollar).
		Where(sq.Eq{"url": url}).
		Limit(1).
		ToSql()

	if err != nil {
		return nil, fmt.Errorf("build query: %w", err)
	}

	err = a.db.GetContext(ctx, &res, q, v...)
	if err != nil {
		return nil, fmt.Errorf("get: %w", err)
	}

	return &res, nil
}

func (a ArticleRepository) GetByID(ctx context.Context, id uint64) (*models.Article, error) {
	var res models.Article

	q, v, err := sq.Select(articleTableColumns...).
		From(articleTableName).
		PlaceholderFormat(sq.Dollar).
		Where(sq.Eq{"id": id}).
		Limit(1).
		ToSql()

	if err != nil {
		return nil, fmt.Errorf("build query: %w", err)
	}

	err = a.db.GetContext(ctx, &res, q, v...)
	if err != nil {
		return nil, fmt.Errorf("get: %w", err)
	}

	return &res, nil
}

func (a ArticleRepository) Add(ctx context.Context, m models.Article) (uint64, error) {
	q, v, err := sq.Insert(articleTableName).
		PlaceholderFormat(sq.Dollar).
		Columns(
			"url",
			"publish_time",
			"title",
			"image",
			"text",
			"preview_text",
			"meta_keywords",
			"meta_desc",
			"is_active",
		).Values(
		m.URL,
		m.PublishTime,
		m.Title,
		m.Image,
		m.Text,
		m.PreviewText,
		m.MetaKeywords,
		m.MetaDescription,
		m.IsActive,
	).
		Suffix("RETURNING id").
		ToSql()

	if err != nil {
		return 0, fmt.Errorf("build query: %w", err)
	}

	var id uint64
	err = a.db.QueryRowContext(ctx, q, v...).Scan(&id)
	if err != nil {
		return 0, fmt.Errorf("query row: %w", err)
	}

	return id, nil
}

func (a ArticleRepository) Update(ctx context.Context, req models.Article) error {
	q, v, err := sq.Update(articleTableName).
		PlaceholderFormat(sq.Dollar).
		Set("url", req.URL).
		Set("publish_time", req.PublishTime).
		Set("title", req.Title).
		Set("image", req.Image).
		Set("text", req.Text).
		Set("preview_text", req.PreviewText).
		Set("meta_keywords", req.MetaKeywords).
		Set("meta_desc", req.MetaDescription).
		Set("is_active", req.IsActive).
		Where(sq.Eq{"id": req.ID}).
		ToSql()

	if err != nil {
		return fmt.Errorf("build query: %w", err)
	}

	_, err = a.db.ExecContext(ctx, q, v...)
	if err != nil {
		return fmt.Errorf("exec: %w", err)
	}

	return nil
}

func (a ArticleRepository) Delete(ctx context.Context, id uint64) error {
	q, v, err := sq.Delete(articleTableName).
		PlaceholderFormat(sq.Dollar).
		Where(sq.Eq{"id": id}).
		ToSql()

	if err != nil {
		return fmt.Errorf("build query: %w", err)
	}

	_, err = a.db.ExecContext(ctx, q, v...)
	if err != nil {
		return fmt.Errorf("exec: %w", err)
	}

	return nil
}