use crate::dialect::keywords::*;
use crate::dialect::Dialect;

pub struct PostgreSqlDialect {}

impl Dialect for PostgreSqlDialect {
    fn keywords(&self) -> Vec<&'static str> {
        return vec![
            ALTER, ONLY, SELECT, FROM, WHERE, LIMIT, ORDER, GROUP, BY, HAVING, UNION, ALL, INSERT,
            INTO, UPDATE, DELETE, IN, IS, NULL, SET, CREATE, EXTERNAL, TABLE, ASC, DESC, AND, OR,
            NOT, AS, STORED, CSV, WITH, WITHOUT, ROW, // SQL types
            CHAR, CHARACTER, VARYING, LARGE, VARCHAR, CLOB, BINARY, VARBINARY, BLOB, FLOAT, REAL,
            DOUBLE, PRECISION, INT, INTEGER, SMALLINT, BIGINT, NUMERIC, DECIMAL, DEC, BOOLEAN,
            DATE, TIME, TIMESTAMP, VALUES, DEFAULT, ZONE, REGCLASS, TEXT, BYTEA, TRUE, FALSE, COPY,
            STDIN, PRIMARY, KEY, UNIQUE, UUID, ADD, CONSTRAINT, FOREIGN, REFERENCES, CASE, WHEN,
            THEN, ELSE, END, JOIN, LEFT, RIGHT, FULL, CROSS, OUTER, INNER, NATURAL, ON, USING,
            LIKE, NULLS, FIRST, LAST,
        ];
    }

    fn is_identifier_start(&self, ch: char) -> bool {
        (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || ch == '@'
    }

    fn is_identifier_part(&self, ch: char) -> bool {
        (ch >= 'a' && ch <= 'z')
            || (ch >= 'A' && ch <= 'Z')
            || (ch >= '0' && ch <= '9')
            || ch == '@'
            || ch == '_'
    }
}