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use libc::c_void;

use crate::util::{go_iowritter::GoIOWritter, util::ref_free_drop, go_type::FFIError};

use self::ffi::nosqldb_logger_new;

pub(crate) mod ffi {
    use std::mem;

    use crate::util::{go_iowritter::{GoIOWritterPtr, GoIOWritter}, util::{ffi::FfiNosqldbPtrAndErrorNewReturn, c_char_to_str}, go_type::FFIError};

    use super::{NosqldbLogger, LoggerLogLevel};

    extern "C" {
        pub fn ffi_nosqldb_logger_new(ioWritter_ptr: GoIOWritterPtr, level: LoggerLogLevel, useLocalTime: bool) -> FfiNosqldbPtrAndErrorNewReturn;
    }

    pub fn nosqldb_logger_new(
        writter: GoIOWritter,
        level: LoggerLogLevel,
        use_local_time: bool,
    ) -> Result<NosqldbLogger, FFIError> {
        let FfiNosqldbPtrAndErrorNewReturn { ptr: logger_ptr, go_error_ptr } = unsafe { ffi_nosqldb_logger_new(writter.go_io_writter_ptr, level, use_local_time) };
        mem::forget(writter);
        if go_error_ptr.is_null() {
            Ok(NosqldbLogger { nosqldb_logger: logger_ptr })
        } else {
            Err(FFIError::GoError(c_char_to_str(go_error_ptr)?))
        }
    }
}

#[repr(C)]
pub enum LoggerLogLevel {
    // Fine represents a level used to log the most detailed output.
    Fine = 10,

    // Trace represents a level used to log tracing messages.
    Trace = 15,

    // Debug represents a level used to log debug messages.
    Debug = 20,

    // Info represents a level used to log informative messages.
    Info = 30,

    // Warn represents a level used to log warning messages.
    Warn = 40,

    // Error represents a level used to log error messages.
    Error = 50,

    // Off turns off logging.
    Off = 99,
}

pub(crate) type NosqldbLoggerPtr = *const c_void;

pub struct NosqldbLogger {
    pub(crate) nosqldb_logger: NosqldbLoggerPtr,
}

impl NosqldbLogger {
    pub fn new <T: std::io::Write + 'static> (
        writter: T,
        level: LoggerLogLevel,
        use_local_time: bool,
    ) -> Result<Self, FFIError>  {
        let writter = GoIOWritter::new(writter);
        nosqldb_logger_new(writter, level, use_local_time)
    }
}

impl Drop for NosqldbLogger {
    fn drop(&mut self) {
        ref_free_drop(self.nosqldb_logger);
    }
}