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use super::operation::*;
use crate::*;

use connector_interface::{CompositeWriteOperation, FieldPath, ScalarWriteOperation, WriteOperation};
use mongodb::bson::doc;
use query_structure::{Field, PrismaValue};

pub(crate) trait IntoUpdateOperation {
    fn into_update_operations(self, field: &Field, path: FieldPath) -> crate::Result<Vec<UpdateOperation>>;
}

impl IntoUpdateOperation for WriteOperation {
    fn into_update_operations(self, field: &Field, path: FieldPath) -> crate::Result<Vec<UpdateOperation>> {
        match self {
            WriteOperation::Scalar(op) => op.into_update_operations(field, path),
            WriteOperation::Composite(op) => op.into_update_operations(field, path),
        }
    }
}

impl IntoUpdateOperation for ScalarWriteOperation {
    fn into_update_operations(self, field: &Field, field_path: FieldPath) -> crate::Result<Vec<UpdateOperation>> {
        let dollar_field_path = field_path.dollar_path(true);

        let doc = match self {
            ScalarWriteOperation::Add(rhs) if field.is_list() => Some(render_push_update_doc(rhs, field, field_path)?),
            // We use $literal to enable the set of empty object, which is otherwise considered a syntax error
            ScalarWriteOperation::Set(rhs) => Some(UpdateOperation::generic(
                field_path,
                doc! { "$literal": (field, rhs).into_bson()? },
            )),
            ScalarWriteOperation::Add(rhs) => Some(UpdateOperation::generic(
                field_path,
                doc! { "$add": [dollar_field_path, (field, rhs).into_bson()?] },
            )),
            ScalarWriteOperation::Substract(rhs) => Some(UpdateOperation::generic(
                field_path,
                doc! { "$subtract": [dollar_field_path, (field, rhs).into_bson()?] },
            )),
            ScalarWriteOperation::Multiply(rhs) => Some(UpdateOperation::generic(
                field_path,
                doc! { "$multiply": [dollar_field_path, (field, rhs).into_bson()?] },
            )),
            ScalarWriteOperation::Divide(rhs) => Some(UpdateOperation::generic(
                field_path,
                doc! { "$divide": [dollar_field_path, (field, rhs).into_bson()?] },
            )),
            ScalarWriteOperation::Unset(true) => Some(UpdateOperation::unset(field_path)),
            ScalarWriteOperation::Unset(false) => None,
            ScalarWriteOperation::Field(_) => unimplemented!(),
        };

        if let Some(doc) = doc {
            Ok(vec![doc])
        } else {
            Ok(vec![])
        }
    }
}

impl IntoUpdateOperation for CompositeWriteOperation {
    fn into_update_operations(self, field: &Field, path: FieldPath) -> crate::Result<Vec<UpdateOperation>> {
        let docs = match self {
            // We use $literal to enable the set of empty object, which is otherwise considered a syntax error
            CompositeWriteOperation::Set(rhs) => {
                vec![UpdateOperation::generic(
                    path,
                    doc! { "$literal": (field, rhs).into_bson()? },
                )]
            }
            CompositeWriteOperation::Update(nested_write) => {
                let mut update_docs = vec![];

                for (write_op, field, field_path) in nested_write.unfold(field, path) {
                    update_docs.extend(write_op.into_update_operations(&field, field_path)?);
                }

                update_docs
            }
            CompositeWriteOperation::Unset(should_unset) => {
                let mut ops = Vec::with_capacity(1);

                if should_unset {
                    ops.push(UpdateOperation::unset(path));
                }

                ops
            }
            CompositeWriteOperation::Push(rhs) => {
                vec![render_push_update_doc(rhs, field, path)?]
            }
            CompositeWriteOperation::Upsert { set, update } => {
                let set = (*set)
                    .into_update_operations(field, path.clone())?
                    .swap_remove(0)
                    .try_into_generic()
                    .unwrap();
                let updates = (*update).into_update_operations(field, path.clone())?;

                vec![UpdateOperation::upsert(path, set, updates)]
            }
            CompositeWriteOperation::UpdateMany { filter, update } => {
                let elem_alias = format!("{}_item", path.identifier());
                let updates = (*update).into_update_operations(field, FieldPath::new_from_alias(&elem_alias))?;

                vec![UpdateOperation::update_many(path, filter, elem_alias, updates)]
            }
            CompositeWriteOperation::DeleteMany { filter } => {
                let elem_alias = format!("{}_item", path.identifier());
                let (filter_doc, _) = filter::MongoFilterVisitor::new(format!("${}", &elem_alias), true)
                    .visit(filter)?
                    .render();

                let filter = doc! {
                    "$filter": {
                        "input": path.dollar_path(true),
                        "as": &elem_alias,
                        "cond": filter_doc
                    }
                };

                vec![UpdateOperation::generic(path, filter)]
            }
        };

        Ok(docs)
    }
}

fn render_push_update_doc(rhs: PrismaValue, field: &Field, field_path: FieldPath) -> crate::Result<UpdateOperation> {
    let dollar_field_path = field_path.dollar_path(true);

    let values = match rhs {
        PrismaValue::List(vals) => {
            vals.into_iter()
                .map(|val| (field, val).into_bson())
                .collect::<crate::Result<Vec<_>>>()?
                .into_iter()
                .map(|bson| {
                    // Strip the list from the BSON values. [Todo] This is unfortunately necessary right now due to how the
                    // conversion is set up with native types, we should clean that up at some point (move from traits to fns?).
                    let bson = match bson {
                        Bson::Array(mut inner) if field.is_composite() => inner.pop().unwrap(),
                        _ => bson,
                    };

                    Bson::Document(doc! { "$literal": bson })
                })
                .collect()
        }
        val => match (field, val).into_bson()? {
            Bson::Array(inner) => inner
                .into_iter()
                .map(|val| Bson::Document(doc! { "$literal": val }))
                .collect(),
            bson => vec![Bson::Document(doc! { "$literal": bson })],
        },
    };

    let bson_array = Bson::Array(values);

    Ok(UpdateOperation::generic(
        field_path,
        doc! {
            "$ifNull": [
                { "$concatArrays": [dollar_field_path, bson_array.clone()] },
                bson_array
            ]
        },
    ))
}