// -------------------------------------------------------------------------------------------------
//  Copyright (C) 2015-2025 Nautech Systems Pty Ltd. All rights reserved.
//  https://nautechsystems.io
//
//  Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
//  You may not use this file except in compliance with the License.
//  You may obtain a copy of the License at https://www.gnu.org/licenses/lgpl-3.0.en.html
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
// -------------------------------------------------------------------------------------------------

use std::{collections::HashMap, str::FromStr, sync::Arc};

use arrow::{
    array::{FixedSizeBinaryArray, FixedSizeBinaryBuilder, UInt64Array},
    datatypes::{DataType, Field, Schema},
    error::ArrowError,
    record_batch::RecordBatch,
};
use nautilus_model::{
    data::QuoteTick,
    identifiers::InstrumentId,
    types::{Price, Quantity, fixed::PRECISION_BYTES},
};

use super::{
    DecodeDataFromRecordBatch, EncodingError, KEY_INSTRUMENT_ID, KEY_PRICE_PRECISION,
    KEY_SIZE_PRECISION, extract_column, get_raw_price, get_raw_quantity,
};
use crate::arrow::{ArrowSchemaProvider, Data, DecodeFromRecordBatch, EncodeToRecordBatch};

impl ArrowSchemaProvider for QuoteTick {
    fn get_schema(metadata: Option<HashMap<String, String>>) -> Schema {
        let fields = vec![
            Field::new(
                "bid_price",
                DataType::FixedSizeBinary(PRECISION_BYTES),
                false,
            ),
            Field::new(
                "ask_price",
                DataType::FixedSizeBinary(PRECISION_BYTES),
                false,
            ),
            Field::new(
                "bid_size",
                DataType::FixedSizeBinary(PRECISION_BYTES),
                false,
            ),
            Field::new(
                "ask_size",
                DataType::FixedSizeBinary(PRECISION_BYTES),
                false,
            ),
            Field::new("ts_event", DataType::UInt64, false),
            Field::new("ts_init", DataType::UInt64, false),
        ];

        match metadata {
            Some(metadata) => Schema::new_with_metadata(fields, metadata),
            None => Schema::new(fields),
        }
    }
}

fn parse_metadata(
    metadata: &HashMap<String, String>,
) -> Result<(InstrumentId, u8, u8), EncodingError> {
    let instrument_id_str = metadata
        .get(KEY_INSTRUMENT_ID)
        .ok_or_else(|| EncodingError::MissingMetadata(KEY_INSTRUMENT_ID))?;
    let instrument_id = InstrumentId::from_str(instrument_id_str)
        .map_err(|e| EncodingError::ParseError(KEY_INSTRUMENT_ID, e.to_string()))?;

    let price_precision = metadata
        .get(KEY_PRICE_PRECISION)
        .ok_or_else(|| EncodingError::MissingMetadata(KEY_PRICE_PRECISION))?
        .parse::<u8>()
        .map_err(|e| EncodingError::ParseError(KEY_PRICE_PRECISION, e.to_string()))?;

    let size_precision = metadata
        .get(KEY_SIZE_PRECISION)
        .ok_or_else(|| EncodingError::MissingMetadata(KEY_SIZE_PRECISION))?
        .parse::<u8>()
        .map_err(|e| EncodingError::ParseError(KEY_SIZE_PRECISION, e.to_string()))?;

    Ok((instrument_id, price_precision, size_precision))
}

impl EncodeToRecordBatch for QuoteTick {
    fn encode_batch(
        metadata: &HashMap<String, String>,
        data: &[Self],
    ) -> Result<RecordBatch, ArrowError> {
        let mut bid_price_builder =
            FixedSizeBinaryBuilder::with_capacity(data.len(), PRECISION_BYTES);
        let mut ask_price_builder =
            FixedSizeBinaryBuilder::with_capacity(data.len(), PRECISION_BYTES);
        let mut bid_size_builder =
            FixedSizeBinaryBuilder::with_capacity(data.len(), PRECISION_BYTES);
        let mut ask_size_builder =
            FixedSizeBinaryBuilder::with_capacity(data.len(), PRECISION_BYTES);
        let mut ts_event_builder = UInt64Array::builder(data.len());
        let mut ts_init_builder = UInt64Array::builder(data.len());

        for quote in data {
            bid_price_builder
                .append_value(quote.bid_price.raw.to_le_bytes())
                .unwrap();
            ask_price_builder
                .append_value(quote.ask_price.raw.to_le_bytes())
                .unwrap();
            bid_size_builder
                .append_value(quote.bid_size.raw.to_le_bytes())
                .unwrap();
            ask_size_builder
                .append_value(quote.ask_size.raw.to_le_bytes())
                .unwrap();
            ts_event_builder.append_value(quote.ts_event.as_u64());
            ts_init_builder.append_value(quote.ts_init.as_u64());
        }

        RecordBatch::try_new(
            Self::get_schema(Some(metadata.clone())).into(),
            vec![
                Arc::new(bid_price_builder.finish()),
                Arc::new(ask_price_builder.finish()),
                Arc::new(bid_size_builder.finish()),
                Arc::new(ask_size_builder.finish()),
                Arc::new(ts_event_builder.finish()),
                Arc::new(ts_init_builder.finish()),
            ],
        )
    }

    fn metadata(&self) -> HashMap<String, String> {
        Self::get_metadata(
            &self.instrument_id,
            self.bid_price.precision,
            self.bid_size.precision,
        )
    }
}

impl DecodeFromRecordBatch for QuoteTick {
    fn decode_batch(
        metadata: &HashMap<String, String>,
        record_batch: RecordBatch,
    ) -> Result<Vec<Self>, EncodingError> {
        let (instrument_id, price_precision, size_precision) = parse_metadata(metadata)?;
        let cols = record_batch.columns();

        let bid_price_values = extract_column::<FixedSizeBinaryArray>(
            cols,
            "bid_price",
            0,
            DataType::FixedSizeBinary(PRECISION_BYTES),
        )?;
        let ask_price_values = extract_column::<FixedSizeBinaryArray>(
            cols,
            "ask_price",
            1,
            DataType::FixedSizeBinary(PRECISION_BYTES),
        )?;
        let bid_size_values = extract_column::<FixedSizeBinaryArray>(
            cols,
            "bid_size",
            2,
            DataType::FixedSizeBinary(PRECISION_BYTES),
        )?;
        let ask_size_values = extract_column::<FixedSizeBinaryArray>(
            cols,
            "ask_size",
            3,
            DataType::FixedSizeBinary(PRECISION_BYTES),
        )?;
        let ts_event_values = extract_column::<UInt64Array>(cols, "ts_event", 4, DataType::UInt64)?;
        let ts_init_values = extract_column::<UInt64Array>(cols, "ts_init", 5, DataType::UInt64)?;

        if bid_price_values.value_length() != PRECISION_BYTES {
            return Err(EncodingError::ParseError(
                "bid_price",
                format!(
                    "Invalid value length: expected {PRECISION_BYTES}, found {}",
                    bid_price_values.value_length()
                ),
            ));
        }
        if ask_price_values.value_length() != PRECISION_BYTES {
            return Err(EncodingError::ParseError(
                "ask_price",
                format!(
                    "Invalid value length: expected {PRECISION_BYTES}, found {}",
                    ask_price_values.value_length()
                ),
            ));
        }

        let result: Result<Vec<Self>, EncodingError> = (0..record_batch.num_rows())
            .map(|row| {
                Ok(Self {
                    instrument_id,
                    bid_price: Price::from_raw(
                        get_raw_price(bid_price_values.value(row)),
                        price_precision,
                    ),
                    ask_price: Price::from_raw(
                        get_raw_price(ask_price_values.value(row)),
                        price_precision,
                    ),
                    bid_size: Quantity::from_raw(
                        get_raw_quantity(bid_size_values.value(row)),
                        size_precision,
                    ),
                    ask_size: Quantity::from_raw(
                        get_raw_quantity(ask_size_values.value(row)),
                        size_precision,
                    ),
                    ts_event: ts_event_values.value(row).into(),
                    ts_init: ts_init_values.value(row).into(),
                })
            })
            .collect();

        result
    }
}

impl DecodeDataFromRecordBatch for QuoteTick {
    fn decode_data_batch(
        metadata: &HashMap<String, String>,
        record_batch: RecordBatch,
    ) -> Result<Vec<Data>, EncodingError> {
        let ticks: Vec<Self> = Self::decode_batch(metadata, record_batch)?;
        Ok(ticks.into_iter().map(Data::from).collect())
    }
}

////////////////////////////////////////////////////////////////////////////////
// Tests
////////////////////////////////////////////////////////////////////////////////
#[cfg(test)]
mod tests {
    use std::{collections::HashMap, sync::Arc};

    use arrow::{array::Array, record_batch::RecordBatch};
    use nautilus_model::types::{fixed::FIXED_SCALAR, price::PriceRaw, quantity::QuantityRaw};
    use rstest::rstest;

    use super::*;
    use crate::arrow::get_raw_price;

    #[rstest]
    fn test_get_schema() {
        let instrument_id = InstrumentId::from("AAPL.XNAS");
        let metadata = QuoteTick::get_metadata(&instrument_id, 2, 0);
        let schema = QuoteTick::get_schema(Some(metadata.clone()));

        let mut expected_fields = Vec::with_capacity(6);

        expected_fields.push(Field::new(
            "bid_price",
            DataType::FixedSizeBinary(PRECISION_BYTES),
            false,
        ));
        expected_fields.push(Field::new(
            "ask_price",
            DataType::FixedSizeBinary(PRECISION_BYTES),
            false,
        ));

        expected_fields.extend(vec![
            Field::new(
                "bid_size",
                DataType::FixedSizeBinary(PRECISION_BYTES),
                false,
            ),
            Field::new(
                "ask_size",
                DataType::FixedSizeBinary(PRECISION_BYTES),
                false,
            ),
            Field::new("ts_event", DataType::UInt64, false),
            Field::new("ts_init", DataType::UInt64, false),
        ]);

        let expected_schema = Schema::new_with_metadata(expected_fields, metadata);
        assert_eq!(schema, expected_schema);
    }

    #[rstest]
    fn test_get_schema_map() {
        let arrow_schema = QuoteTick::get_schema_map();
        let mut expected_map = HashMap::new();

        let fixed_size_binary = format!("FixedSizeBinary({PRECISION_BYTES})");
        expected_map.insert("bid_price".to_string(), fixed_size_binary.clone());
        expected_map.insert("ask_price".to_string(), fixed_size_binary.clone());
        expected_map.insert("bid_size".to_string(), fixed_size_binary.clone());
        expected_map.insert("ask_size".to_string(), fixed_size_binary);
        expected_map.insert("ts_event".to_string(), "UInt64".to_string());
        expected_map.insert("ts_init".to_string(), "UInt64".to_string());
        assert_eq!(arrow_schema, expected_map);
    }

    #[rstest]
    fn test_encode_quote_tick() {
        // Create test data
        let instrument_id = InstrumentId::from("AAPL.XNAS");
        let tick1 = QuoteTick {
            instrument_id,
            bid_price: Price::from("100.10"),
            ask_price: Price::from("101.50"),
            bid_size: Quantity::from(1000),
            ask_size: Quantity::from(500),
            ts_event: 1.into(),
            ts_init: 3.into(),
        };

        let tick2 = QuoteTick {
            instrument_id,
            bid_price: Price::from("100.75"),
            ask_price: Price::from("100.20"),
            bid_size: Quantity::from(750),
            ask_size: Quantity::from(300),
            ts_event: 2.into(),
            ts_init: 4.into(),
        };

        let data = vec![tick1, tick2];
        let metadata = QuoteTick::get_metadata(&instrument_id, 2, 0);
        let record_batch = QuoteTick::encode_batch(&metadata, &data).unwrap();

        // Verify the encoded data
        let columns = record_batch.columns();

        let bid_price_values = columns[0]
            .as_any()
            .downcast_ref::<FixedSizeBinaryArray>()
            .unwrap();
        let ask_price_values = columns[1]
            .as_any()
            .downcast_ref::<FixedSizeBinaryArray>()
            .unwrap();
        assert_eq!(
            get_raw_price(bid_price_values.value(0)),
            (100.10 * FIXED_SCALAR) as PriceRaw
        );
        assert_eq!(
            get_raw_price(bid_price_values.value(1)),
            (100.75 * FIXED_SCALAR) as PriceRaw
        );
        assert_eq!(
            get_raw_price(ask_price_values.value(0)),
            (101.50 * FIXED_SCALAR) as PriceRaw
        );
        assert_eq!(
            get_raw_price(ask_price_values.value(1)),
            (100.20 * FIXED_SCALAR) as PriceRaw
        );

        let bid_size_values = columns[2]
            .as_any()
            .downcast_ref::<FixedSizeBinaryArray>()
            .unwrap();
        let ask_size_values = columns[3]
            .as_any()
            .downcast_ref::<FixedSizeBinaryArray>()
            .unwrap();
        let ts_event_values = columns[4].as_any().downcast_ref::<UInt64Array>().unwrap();
        let ts_init_values = columns[5].as_any().downcast_ref::<UInt64Array>().unwrap();

        assert_eq!(columns.len(), 6);
        assert_eq!(bid_size_values.len(), 2);
        assert_eq!(
            get_raw_quantity(bid_size_values.value(0)),
            (1000.0 * FIXED_SCALAR) as QuantityRaw
        );
        assert_eq!(
            get_raw_quantity(bid_size_values.value(1)),
            (750.0 * FIXED_SCALAR) as QuantityRaw
        );
        assert_eq!(ask_size_values.len(), 2);
        assert_eq!(
            get_raw_quantity(ask_size_values.value(0)),
            (500.0 * FIXED_SCALAR) as QuantityRaw
        );
        assert_eq!(
            get_raw_quantity(ask_size_values.value(1)),
            (300.0 * FIXED_SCALAR) as QuantityRaw
        );
        assert_eq!(ts_event_values.len(), 2);
        assert_eq!(ts_event_values.value(0), 1);
        assert_eq!(ts_event_values.value(1), 2);
        assert_eq!(ts_init_values.len(), 2);
        assert_eq!(ts_init_values.value(0), 3);
        assert_eq!(ts_init_values.value(1), 4);
    }

    #[rstest]
    fn test_decode_batch() {
        let instrument_id = InstrumentId::from("AAPL.XNAS");
        let metadata = QuoteTick::get_metadata(&instrument_id, 2, 0);

        let (bid_price, ask_price) = (
            FixedSizeBinaryArray::from(vec![
                &(10000 as PriceRaw).to_le_bytes(),
                &(9900 as PriceRaw).to_le_bytes(),
            ]),
            FixedSizeBinaryArray::from(vec![
                &(10100 as PriceRaw).to_le_bytes(),
                &(10000 as PriceRaw).to_le_bytes(),
            ]),
        );

        let bid_size = FixedSizeBinaryArray::from(vec![
            &((100.0 * FIXED_SCALAR) as PriceRaw).to_le_bytes(),
            &((90.0 * FIXED_SCALAR) as PriceRaw).to_le_bytes(),
        ]);
        let ask_size = FixedSizeBinaryArray::from(vec![
            &((110.0 * FIXED_SCALAR) as PriceRaw).to_le_bytes(),
            &((100.0 * FIXED_SCALAR) as PriceRaw).to_le_bytes(),
        ]);
        let ts_event = UInt64Array::from(vec![1, 2]);
        let ts_init = UInt64Array::from(vec![3, 4]);

        let record_batch = RecordBatch::try_new(
            QuoteTick::get_schema(Some(metadata.clone())).into(),
            vec![
                Arc::new(bid_price),
                Arc::new(ask_price),
                Arc::new(bid_size),
                Arc::new(ask_size),
                Arc::new(ts_event),
                Arc::new(ts_init),
            ],
        )
        .unwrap();

        let decoded_data = QuoteTick::decode_batch(&metadata, record_batch).unwrap();
        assert_eq!(decoded_data.len(), 2);

        // Verify decoded values
        assert_eq!(decoded_data[0].bid_price, Price::from_raw(10000, 2));
        assert_eq!(decoded_data[0].ask_price, Price::from_raw(10100, 2));
        assert_eq!(decoded_data[1].bid_price, Price::from_raw(9900, 2));
        assert_eq!(decoded_data[1].ask_price, Price::from_raw(10000, 2));
    }
}
