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use std::fmt::Debug;

use rmp::{
    decode::{bytes::Bytes, *},
    Marker::*,
};
use serde_json::{Map, Number, Value};

pub trait FromRmp {
    type Ret;
    #[allow(clippy::result_unit_err)]
    fn from_rmp(rd: &[u8]) -> Result<Self::Ret, ()>;
}

impl FromRmp for Value {
    type Ret = Self;

    fn from_rmp(rd: &[u8]) -> Result<Self::Ret, ()> {
        from_rmp(rd)
    }
}

#[allow(clippy::result_unit_err)]
pub fn from_rmp(rd: &[u8]) -> Result<Value, ()> {
    let mut rd = Bytes::new(rd);
    read_value(&mut rd)
}

#[allow(clippy::result_unit_err)]
fn utils_read_str(rd: &mut Bytes) -> Result<String, ()> {
    if let Ok(len) = read_str_len(rd) {
        let str = (0..len)
            .map(|_| rd.read_u8().map_err(err_handle))
            .collect::<Result<Vec<u8>, _>>()?;
        Ok(String::from_utf8(str).map_err(err_handle)?)
    } else {
        Err(())
    }
}

fn err_handle<T: Debug>(_e: T) {
    if cfg!(test) || cfg!(debug_assertions) {
        // println!("error: {e:?}");
    }
}

#[allow(clippy::result_unit_err)]
pub fn read_value(rd: &mut Bytes) -> Result<Value, ()> {
    let m = read_marker(rd).map_err(err_handle)?;
    let r = match m {
        FixPos(val) => Value::Number(Number::from(val)),
        FixNeg(val) => Value::Number(Number::from(val)),
        Null => Value::Null,
        True => Value::Bool(true),
        False => Value::Bool(false),
        U8 => Value::Number(Number::from(rd.read_data_u8().map_err(err_handle)?)),
        U16 => Value::Number(Number::from(rd.read_data_u16().map_err(err_handle)?)),
        U32 => Value::Number(Number::from(rd.read_data_u32().map_err(err_handle)?)),
        U64 => Value::Number(Number::from(rd.read_data_u64().map_err(err_handle)?)),
        I8 => Value::Number(Number::from(rd.read_data_i8().map_err(err_handle)?)),
        I16 => Value::Number(Number::from(rd.read_data_i16().map_err(err_handle)?)),
        I32 => Value::Number(Number::from(rd.read_data_i32().map_err(err_handle)?)),
        I64 => Value::Number(Number::from(rd.read_data_i64().map_err(err_handle)?)),
        F32 => Value::Number(
            Number::from_f64(rd.read_data_f32().map_err(err_handle)?.into()).ok_or(())?,
        ),
        F64 => Value::Number(Number::from_f64(rd.read_data_f64().map_err(err_handle)?).ok_or(())?),
        FixStr(size) => {
            let size = size as usize;
            let str = (0..size)
                .map(|_| rd.read_u8().map_err(err_handle))
                .collect::<Result<Vec<u8>, _>>()?;
            Value::String(String::from_utf8(str).map_err(err_handle)?)
        }
        Str8 => {
            let size = rd.read_data_u8().map_err(err_handle)? as usize;
            let str = (0..size)
                .map(|_| rd.read_u8().map_err(err_handle))
                .collect::<Result<Vec<u8>, _>>()?;
            Value::String(String::from_utf8(str).map_err(err_handle)?)
        }
        Str16 => {
            let size = rd.read_data_u16().map_err(err_handle)? as usize;
            let str = (0..size)
                .map(|_| rd.read_u8().map_err(err_handle))
                .collect::<Result<Vec<u8>, _>>()?;
            Value::String(String::from_utf8(str).map_err(err_handle)?)
        }
        Str32 => {
            let size = rd.read_data_u32().map_err(err_handle)? as usize;
            let str = (0..size)
                .map(|_| rd.read_u8().map_err(err_handle))
                .collect::<Result<Vec<u8>, _>>()?;
            Value::String(String::from_utf8(str).map_err(err_handle)?)
        }
        FixArray(size) => {
            let size = size as usize;
            let arr = (0..size)
                .map(|_| read_value(rd))
                .collect::<Result<Vec<_>, _>>()?;
            // let arr = arr.map_err(err_handle)?;
            Value::Array(arr)
        }
        Array16 => {
            let size = rd.read_data_u16().map_err(err_handle)? as usize;
            let arr = (0..size)
                .map(|_| read_value(rd))
                .collect::<Result<Vec<_>, _>>();
            let arr = arr.map_err(err_handle)?;
            Value::Array(arr)
        }
        Array32 => {
            let size = rd.read_data_u32().map_err(err_handle)? as usize;
            let arr = (0..size)
                .map(|_| read_value(rd))
                .collect::<Result<Vec<_>, _>>();
            let arr = arr.map_err(err_handle)?;
            Value::Array(arr)
        }
        FixMap(size) => {
            let size = size as usize;
            let map = (0..size)
                .map(|_| -> Result<(String, Value), ()> {
                    Ok((utils_read_str(rd)?, read_value(rd)?))
                })
                .collect::<Result<Map<String, Value>, _>>()?;
            Value::Object(map)
        }
        Map16 => {
            let size = rd.read_data_u16().map_err(err_handle)? as usize;
            let map = (0..size)
                .map(|_| -> Result<(String, Value), ()> {
                    Ok((utils_read_str(rd)?, read_value(rd)?))
                })
                .collect::<Result<Map<String, Value>, _>>()?;
            Value::Object(map)
        }
        Map32 => {
            let size = rd.read_data_u32().map_err(err_handle)? as usize;
            let map = (0..size)
                .map(|_| -> Result<(String, Value), ()> {
                    Ok((utils_read_str(rd)?, read_value(rd)?))
                })
                .collect::<Result<Map<String, Value>, _>>()?;
            Value::Object(map)
        }
        _ => return Err(()),
    };
    Ok(r)
}