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use crate::model::table_field_schema::TableFieldSchema;
use serde::{Deserialize, Serialize};

#[derive(Debug, Default, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct TableSchema {
    /// Describes the fields in a table.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub fields: Option<Vec<TableFieldSchema>>,
}

impl TableSchema {
    pub fn new(fields: Vec<TableFieldSchema>) -> Self {
        Self { fields: Some(fields) }
    }

    pub fn fields(&self) -> &Option<Vec<TableFieldSchema>> {
        &self.fields
    }

    pub fn field_count(&self) -> usize {
        self.fields.as_ref().map_or(0, |fields| fields.len())
    }

    pub fn is_none(&self) -> bool {
        self.fields.is_none()
    }
}