use cfn_guard::run_checks;
use ffi_support::ExternError;
use std::os::raw::c_char;

mod errors;
mod types;

use errors::FfiError;
use types::FfiValidateInput;

/**
 * C prototype for this function:
 * typedef struct {
 *   int32_t code;
 *   char *message;
 * } extern_err_t;
 *
 * typedef struct {
 *   char *content;
 *   char *file_name;
 * } validate_input_t;
 *
 * char* cfn_guard_run_checks(validate_input_t template, validate_input_t rules, _Bool verbose, extern_err_t * err);
 * void cfn_guard_free_string(char *);
 *
 * if an error is returned, it will be populated in `err`. `cfn_guard_free_string` must be called
 * for the `message` field in `err`.
 *
 * if `err.code` == 0, then the result will be a json string. This `*char` must be passed to
 * `cfn_guard_free_string` to return the memory allocated by rust.
 */
#[no_mangle]
pub extern "C" fn cfn_guard_run_checks<'a>(
    data: FfiValidateInput<'a>,
    rules: FfiValidateInput<'a>,
    verbose: c_char,
    err: &mut ExternError,
) -> *mut c_char {
    ffi_support::call_with_result(err, || {
        match run_checks(data.into(), rules.into(), verbose == 1) {
            Err(e) => Err(FfiError(e)),
            Ok(r) => Ok(r),
        }
    })
}

ffi_support::define_string_destructor!(cfn_guard_free_string);