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use std::collections::HashMap;

use serde::Serialize;

use crate::util::go_map::GoMap;
use crate::util::go_type::FFIError;
use crate::util::go_type::NosqldbGetRequestPtr;
use crate::util::util::ref_free_drop;

use self::ffi::nosqldb_get_request_new;
use self::ffi::nosqldb_get_request_table_name_set;
use self::ffi::nosqldb_get_request_key_set;

pub(crate) mod ffi{
    use super::NosqldbGetRequest;

    use std::mem;

    use crate::{util::{go_type::{NosqldbGetRequestPtr, FFIError, GoErrorPtr, GoString, NosqldbGetRequestKeyPtr}, util::c_char_to_str, go_map::GoMap}, str_to_gostr};



    extern "C" {
        fn ffi_nosqldb_get_request_new() -> NosqldbGetRequestPtr;
    }

    pub fn nosqldb_get_request_new(
    ) -> Result<NosqldbGetRequest, FFIError> {
        let nosqldb_get_request_ptr: NosqldbGetRequestPtr = unsafe { ffi_nosqldb_get_request_new() };

        Ok(NosqldbGetRequest{ nosqldb_get_request_ptr })
    }

    extern "C"{
        fn ffi_nosqldb_get_request_table_name_set(gtrq: NosqldbGetRequestPtr, tbnm:GoString) -> GoErrorPtr;
    }

    pub fn nosqldb_get_request_table_name_set(
        gtrq: &mut NosqldbGetRequest,
        tbnm: &str
    )-> Result<(), FFIError> {
        str_to_gostr!(tbnm);

        let err = unsafe { ffi_nosqldb_get_request_table_name_set(gtrq.nosqldb_get_request_ptr, tbnm) };
        if err.is_null() {
            Ok(())
        } else {
            Err(FFIError::GoError(c_char_to_str(err)?))
        }
    }

    extern "C"{
        fn ffi_nosqldb_get_request_key_set(gtrq: NosqldbGetRequestPtr, key: NosqldbGetRequestKeyPtr) -> GoErrorPtr;
    }

    pub fn nosqldb_get_request_key_set(
        gtrq: &mut NosqldbGetRequest,
        key: GoMap
    )-> Result<(), FFIError> {
        let err = unsafe { ffi_nosqldb_get_request_key_set(gtrq.nosqldb_get_request_ptr,  key.go_map_ptr) };
        mem::forget(key);
        if err.is_null() {
            Ok(())
        } else {
            Err(FFIError::GoError(c_char_to_str(err)?))
        }
    }
}

#[derive(Debug)]
pub struct NosqldbGetRequest {
    pub(crate) nosqldb_get_request_ptr: NosqldbGetRequestPtr,
}


impl NosqldbGetRequest {
    pub fn new () -> Result<Self, FFIError> {
        nosqldb_get_request_new()
    }
    pub fn set_table_name (&mut self, tbnm: &str) -> Result<(), FFIError> {
        nosqldb_get_request_table_name_set(self, tbnm)
    }
    pub fn set_key<T, V> (&mut self, key: HashMap<T, V>) -> Result<(), FFIError>
    where
        T: AsRef<str> + Serialize,
        V: Serialize,
    {
        nosqldb_get_request_key_set(self, GoMap::from_hash_map(key)?)
    }
}

impl Drop for NosqldbGetRequest {
    fn drop(&mut self) {
        ref_free_drop(self.nosqldb_get_request_ptr);
    }
}