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use anyhow::{anyhow, Result};
use serde::{Deserialize, Serialize};
use serde_json::json;

pub struct Client {
    pub url: String,
}

impl Client {
    pub fn new(url: &str) -> Self {
        Client {
            url: url.to_string(),
        }
    }
    pub async fn bulk(&self, bulk_requests: &str) -> Result<BulkResponse> {
        let client = reqwest::Client::new();
        let res = client
            .post(&format!("{}/_bulk", &self.url))
            .header("Content-type", "application/x-ndjson")
            .body(bulk_requests.to_string())
            .send()
            .await?;
        let status = res.status();
        if reqwest::StatusCode::INTERNAL_SERVER_ERROR == status {
            return Err(anyhow!("internal server error {}", res.text().await?,));
        }
        let text = res.text().await?;
        let bulk_response: BulkResponse = serde_json::from_str(&text)?;
        Ok(bulk_response)
    }
}

#[derive(Serialize, Deserialize, Debug)]
pub struct BulkResponse {
    took: i64,
    errors: bool,
    pub items: Vec<BulkResponseItem>,
}

#[derive(Serialize, Deserialize, Debug)]
pub enum BulkResponseItem {
    #[allow(non_camel_case_types)]
    index(IndexResponseItem),
    #[allow(non_camel_case_types)]
    delete(DeleteResponseItem),
}

#[derive(Serialize, Deserialize, Debug)]
pub struct IndexResponseItem {
    _index: String,
    _type: String,
    _id: String,
    _version: Option<i64>,
    result: Option<String>,
    created: Option<bool>,
    pub status: i64,
    pub error: Option<BulkItemError>,
}

#[derive(Serialize, Deserialize, Debug)]
pub struct BulkItemError {
    pub r#type: String,
    pub reason: String,
}

#[derive(Serialize, Deserialize, Debug)]
pub struct DeleteResponseItem {
    _index: String,
    _type: String,
    _id: String,
    error: Option<BulkItemError>,
}

pub enum BulkItem {
    Index(IndexBulkItem),
    Delete(DeleteBulkItem),
}

#[derive(Debug)]
pub struct IndexBulkItem {
    pub id: String,
    pub r#type: String,
    pub parent: Option<String>,
    pub body: String,
    pub version: i64,
}

impl IndexBulkItem {
    fn to_request(&self, index: &str) -> String {
        let head = json!({
            "index": {
                "_index": index,
                "_id": &self.id,
                "_type": &self.r#type,
                "_parent": &self.parent,
                "_version_type": "external",
                "_version": &self.version,
            }
        });
        let mut body = head.to_string();
        body = body + "\n";
        body += &self.body;
        body += "\n";
        body
    }
}

#[derive(Debug)]
pub struct DeleteBulkItem {
    pub id: String,
    pub r#type: String,
    pub parent: Option<String>,
}

impl DeleteBulkItem {
    fn to_request(&self, index: &str) -> String {
        let head = json!({
            "delete": {
                "_index": index,
                "_id": &self.id,
                "_type": &self.r#type,
                "_parent": &self.parent,
            }
        });
        let mut body = head.to_string();
        body = body + "\n";
        body
    }
}

#[derive(Debug)]
pub enum Bulkable {
    Delete(DeleteBulkItem),
    Index(IndexBulkItem),
}

pub struct BulkRequestGenerator {
    pub index: String,
    pub items: Vec<Bulkable>,
}

impl BulkRequestGenerator {
    pub fn new(index: &str) -> Self {
        Self {
            index: index.to_string(),
            items: vec![],
        }
    }
    pub fn add_item(&mut self, item: Bulkable) -> &mut Self {
        &self.items.push(item);
        self
    }
    pub fn generate(&self) -> String {
        let mut body = String::new();
        for item in &self.items {
            match item {
                Bulkable::Delete(i) => {
                    body += i.to_request(&self.index).as_str();
                }
                Bulkable::Index(i) => {
                    body += i.to_request(&self.index).as_str();
                }
            }
        }
        body
    }
}