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use std::borrow::Borrow;
use std::fmt::Debug;
use std::marker::PhantomData;
use bson::{Bson, Document};
use bson::oid::ObjectId;
use mongodb::{Collection, Database};
use mongodb::error::Error;
use mongodb::options::{FindOneOptions, FindOptions};
use opentelemetry::{Context, global, KeyValue};
use crate::document::document::BaseDocument;
use crate::document::pageable::{PageableRequest, PageableResponse};
use crate::repository::base_repository::Repository;
use async_trait::async_trait;
use opentelemetry::trace::{Span, TraceContextExt, Tracer};

pub struct MongoRepository<T: BaseDocument + Debug + serde::ser::Serialize  + for<'de> serde::Deserialize<'de> + Sync  + Send> {
    pub database: Database,
    pub x: PhantomData<T>,
    pub collection: Collection<T>
}

impl<T: BaseDocument + Debug + serde::ser::Serialize  + for<'de> serde::Deserialize<'de> + Sync  + Send> MongoRepository<T> {
    pub fn convert_bson_to_entity(&self, doc: Document) -> Result<T, Error> {
        match bson::from_bson(Bson::Document(doc)) {
            Ok(entity) => Ok(entity),
            Err(err) => {
                Err(Error::custom(err))
            }
        }
    }
}

#[async_trait]
impl<T: BaseDocument + Debug + serde::ser::Serialize  + for<'de> serde::Deserialize<'de> + Sync  + Send> Repository<T> for MongoRepository<T> {
    async fn save(&self, entity: T, ctx: Option<&Context>) -> Result<ObjectId, Error> {

        if let Some(u_ctx) = ctx {
            let mut span =
                global::tracer("opentelemetry").start_with_context("save", u_ctx);

            span.set_attribute(KeyValue::new("method", "save"));
            span.set_attribute(KeyValue::new("system", "mongodb"));

            u_ctx.with_span(span);
        }

        let result = match self.collection.insert_one(entity, None).await {
            Ok(res) => res,
            Err(e) => return Err(Error::custom(e)),
        };

        match result.inserted_id.as_object_id() {
            None => Err(Error::custom("could not get object id saved object..")),
            Some(oid) => Ok(oid),
        }
    }

    async fn save_many(&self, entities: Vec<T>, ctx: Option<&Context>) -> Result<Vec<ObjectId>, Error> {
        let mut ids:Vec<ObjectId> = vec![];

        for entity in entities {
            let saved = self.save(entity, ctx)
                .await?;

            ids.push(saved);
        };

        Ok(ids)
    }

    async fn get_all_pageable(&self, request: PageableRequest, ctx: Option<&Context>) -> Result<PageableResponse<T>, Error> {
        todo!()
    }

    async fn count_documents_in_collection(&self, ctx: Option<&Context>) -> Result<u64, Error> {
        todo!()
    }

    async fn find_by_id(&self, id: &str, ctx: Option<&Context>) -> Result<T, Error> {
        todo!()
    }

    async fn find_by_raw_id(&self, id: ObjectId, ctx: Option<&Context>) -> Result<T, Error> {
        todo!()
    }

    async fn find_by_ids(&self, ids: Vec<String>, ctx: Option<&Context>) -> Result<Vec<T>, Error> {
        todo!()
    }

    async fn find_by_raw_ids(&self, pids: Vec<ObjectId>, ctx: Option<&Context>) -> Result<Vec<T>, Error> {
        todo!()
    }

    async fn find_by_filter_and_options(&self, filter: Document, options: Option<FindOneOptions>, ctx: Option<&Context>) -> Result<T, Error> {
        todo!()
    }

    async fn find_all_by_filter_and_options(&self, filter: Document, options: Option<FindOptions>, ctx: Option<&Context>) -> Result<Vec<T>, Error> {
        todo!()
    }

    async fn update(&self, entity: &T, ctx: Option<&Context>) -> Result<ObjectId, Error> {
        todo!()
    }

    async fn delete(&self, pid: String, ctx: Option<&Context>) -> Result<(), Error> {
        todo!()
    }

    // async fn save_many(&self, entities: Vec<T>, ctx: Option<&Context>) -> Result<Vec<ObjectId>, Error> {
    //     println!("{:?}", entities);
    //     todo!()
    // }
    //
    // async fn get_all_pageable(&self, request: PageableRequest, ctx: Option<&Context>) -> Result<PageableResponse<T>, Error> {
    //     println!("{:?}", request);
    //     todo!()
    // }
    //
    // async fn count_documents_in_collection(&self, ctx: Option<&Context>) -> Result<u64, Error> {
    //     todo!()
    // }
    //
    // async fn find_by_id(&self, id: &str, ctx: Option<&Context>) -> Result<T, Error> {
    //     todo!()
    // }
    //
    // async fn find_by_raw_id(&self, id: ObjectId, ctx: Option<&Context>) -> Result<T, Error> {
    //     todo!()
    // }
    //
    // async fn find_by_ids(&self, ids: Vec<String>, ctx: Option<&Context>) -> Result<Vec<T>, Error> {
    //     todo!()
    // }
    //
    // async fn find_by_raw_ids(&self, pids: Vec<ObjectId>, ctx: Option<&Context>) -> Result<Vec<T>, Error> {
    //     todo!()
    // }
    //
    // async fn find_by_filter_and_options(&self, filter: Document, options: Option<FindOneOptions>, ctx: Option<&Context>) -> Result<T, Error> {
    //     todo!()
    // }
    //
    // async fn find_all_by_filter_and_options(&self, filter: Document, options: Option<FindOptions>, ctx: Option<&Context>) -> Result<Vec<T>, Error> {
    //     todo!()
    // }
    //
    // async fn update(&self, entity: &T, ctx: Option<&Context>) -> Result<ObjectId, Error> {
    //     todo!()
    // }
    //
    // async fn delete(&self, pid: String, ctx: Option<&Context>) -> Result<(), Error> {
    //     todo!()
    // }

}