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use sys::*;
use std::ffi::CStr;
use std::ptr::null;

/// A type implementing this trait can be passed as a string argument in API calls
pub unsafe trait SqlStr {
    /// Returns a pointer to the start of the string
    fn as_text_ptr(&self) -> *const SQLCHAR;
    /// Returns buffer length or SQL_NTS
    fn text_length(&self) -> SQLSMALLINT;
    /// Returns buffer length or SQL_NTSL
    fn text_length_int(&self) -> SQLINTEGER;
}

unsafe impl SqlStr for CStr {
    fn as_text_ptr(&self) -> *const SQLCHAR {
        self.as_ptr() as *const SQLCHAR
    }

    fn text_length(&self) -> SQLSMALLINT {
        SQL_NTS
    }

    fn text_length_int(&self) -> SQLINTEGER {
        SQL_NTSL
    }
}

/// For passing a buffer without terminating NULL
unsafe impl SqlStr for [u8] {
    fn as_text_ptr(&self) -> *const SQLCHAR {
        if self.is_empty() {
            null()
        } else {
            self.as_ptr()
        }
    }

    fn text_length(&self) -> SQLSMALLINT {
        if self.len() > SQLSMALLINT::max_value() as usize {
            panic!(
                "Buffer length of {} is greater than SQLSMALLINT::MAX: {}",
                self.len(),
                SQLSMALLINT::max_value()
            );
        }
        self.len() as SQLSMALLINT
    }

    fn text_length_int(&self) -> SQLINTEGER {
        if self.len() > SQLINTEGER::max_value() as usize {
            panic!(
                "Buffer length of {} is greater than SQLINTEGER::MAX: {}",
                self.len(),
                SQLINTEGER::max_value()
            );
        }
        self.len() as SQLINTEGER
    }
}

/// For passing a buffer without terminating NULL
unsafe impl SqlStr for str {
    fn as_text_ptr(&self) -> *const SQLCHAR {
        if self.is_empty() {
            null()
        } else {
            self.as_ptr()
        }
    }

    fn text_length(&self) -> SQLSMALLINT {
        if self.len() > SQLSMALLINT::max_value() as usize {
            panic!(
                "Buffer length of {} is greater than SQLSMALLINT::MAX: {}",
                self.len(),
                SQLSMALLINT::max_value()
            );
        }
        // str::len is in bytes, so this should work
        self.len() as SQLSMALLINT
    }

    fn text_length_int(&self) -> SQLINTEGER {
        if self.len() > SQLINTEGER::max_value() as usize {
            panic!(
                "Buffer length of {} is greater than SQLINTEGER::MAX: {}",
                self.len(),
                SQLINTEGER::max_value()
            );
        }

        self.len() as SQLINTEGER
    }
}