use minisql::{operation::Operation, interpreter::DbSchema};
use crate::syntax::RawQuerySyntax;
use nom::{branch::alt, IResult};
use thiserror::Error;

use crate::{parsing::{create::parse_create, delete::parse_delete, index::parse_create_index, insert::parse_insert, select::parse_select}, validation::{validate_operation, ValidationError}};

#[derive(Debug, Error)]
pub enum Error {
    #[error("parsing error: {0}")]
    ParsingError(String),
    #[error("validation error: {0}")]
    ValidationError(#[from] ValidationError)
}

fn parse_statement(input: &str) -> IResult<&str, RawQuerySyntax> {
    alt((
        parse_insert,
        parse_create,
        parse_delete,
        //parse_drop,
        parse_select,
        // parse_update,
        parse_create_index
    ))(input)
}

pub fn parse_and_validate(str_query: String, db_schema: &DbSchema) -> Result<Operation, Error> {
    let (_, op) = parse_statement(str_query.as_str())
        .map_err(|err| {
            Error::ParsingError(err.to_string())
        })?;

    Ok(validate_operation(op, db_schema)?)
}

// #[test]
// fn test_select() {
//     parse_and_validate("SELECT * FROM users;".to_string(), &Vec::new()).unwrap();
// }