package fic

import ()

// Theme represents a group of challenges, to display to players
type Theme struct {
	Id       int64  `json:"id"`
	Name     string `json:"name"`
	URLId    string `json:"urlid"`
	Path     string `json:"path"`
	Authors  string `json:"authors,omitempty"`
	Intro    string `json:"intro,omitempty"`
	Headline string `json:"headline,omitempty"`
	Image    string `json:"image,omitempty"`
}

// GetThemes returns a list of registered Themes from the database.
func GetThemes() ([]Theme, error) {
	if rows, err := DBQuery("SELECT id_theme, name, url_id, path, authors, intro, headline, image FROM themes"); err != nil {
		return nil, err
	} else {
		defer rows.Close()

		var themes = make([]Theme, 0)
		for rows.Next() {
			var t Theme
			if err := rows.Scan(&t.Id, &t.Name, &t.URLId, &t.Path, &t.Authors, &t.Intro, &t.Headline, &t.Image); err != nil {
				return nil, err
			}
			themes = append(themes, t)
		}
		if err := rows.Err(); err != nil {
			return nil, err
		}

		return themes, nil
	}
}

// GetTheme retrieves a Theme from its identifier.
func GetTheme(id int64) (Theme, error) {
	var t Theme
	if err := DBQueryRow("SELECT id_theme, name, url_id, path, authors, intro, headline, image FROM themes WHERE id_theme=?", id).Scan(&t.Id, &t.Name, &t.URLId, &t.Path, &t.Authors, &t.Intro, &t.Headline, &t.Image); err != nil {
		return t, err
	}

	return t, nil
}

// GetThemeByName retrieves a Theme from its title
func GetThemeByName(name string) (Theme, error) {
	var t Theme
	if err := DBQueryRow("SELECT id_theme, name, url_id, path, authors, intro, headline, image FROM themes WHERE name=?", name).Scan(&t.Id, &t.Name, &t.URLId, &t.Path, &t.Authors, &t.Intro, &t.Headline, &t.Image); err != nil {
		return t, err
	}

	return t, nil
}

// CreateTheme creates and fills a new struct Theme and registers it into the database.
func CreateTheme(name string, url_id string, path string, authors string, intro string, headline string, image string) (Theme, error) {
	if res, err := DBExec("INSERT INTO themes (name, url_id, authors, path, intro, headline, image) VALUES (?, ?, ?, ?, ?, ?, ?)", name, url_id, authors, path, intro, headline, image); err != nil {
		return Theme{}, err
	} else if tid, err := res.LastInsertId(); err != nil {
		return Theme{}, err
	} else {
		return Theme{tid, name, url_id, path, authors, intro, headline, image}, nil
	}
}

// FixURLId generates a valid URLid from the Theme Title.
// It returns true if something has been generated.
func (t *Theme) FixURLId() bool {
	if t.URLId == "" {
		t.URLId = ToURLid(t.Name)
		return true
	}
	return false
}

// Update applies modifications back to the database.
func (t Theme) Update() (int64, error) {
	if res, err := DBExec("UPDATE themes SET name = ?, url_id = ?, authors = ?, path = ?, intro = ?, headline = ?, image = ? WHERE id_theme = ?", t.Name, t.URLId, t.Authors, t.Path, t.Intro, t.Headline, t.Image, t.Id); err != nil {
		return 0, err
	} else if nb, err := res.RowsAffected(); err != nil {
		return 0, err
	} else {
		return nb, err
	}
}

// Delete the theme from the database.
func (t Theme) Delete() (int64, error) {
	if res, err := DBExec("DELETE FROM themes WHERE id_theme = ?", t.Id); err != nil {
		return 0, err
	} else if nb, err := res.RowsAffected(); err != nil {
		return 0, err
	} else {
		return nb, err
	}
}