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use std::error::Error;

use reqwest::Url;
use serde::de::DeserializeOwned;
use serde::{Deserialize, Serialize};

use author_search::{AuthorSearchParams, AuthorSearchResult};
use floor_list::FloorListParams;
use floor_list::FloorListResult;

use crate::ApiParams::{AuthorSearch, FloorList};

mod author_search;
mod floor_list;

const ENDPOINT_BASE: &str = "https://api.dmm.com/affiliate/v3/";

#[derive(Serialize, Debug)]
#[serde(untagged)]
enum ApiParams {
    FloorList(FloorListParams),
    AuthorSearch(AuthorSearchParams),
}

#[derive(Deserialize, Debug)]
pub struct ApiResponse<T: ApiResult> {
    pub result: T,
}

pub trait ApiResult {}

pub struct Dmm {
    api_id: String,
    affiliate_id: String,
}

impl Dmm {
    pub fn new(dmm_api_id: &str, dmm_affiliate_id: &str) -> Self {
        Dmm {
            api_id: dmm_api_id.to_string(),
            affiliate_id: dmm_affiliate_id.to_string(),
        }
    }

    async fn call<T>(&self, api: &str, params: ApiParams) -> Result<ApiResponse<T>, Box<dyn Error>>
    where
        T: ApiResult + DeserializeOwned,
    {
        let auth = querystring::stringify(vec![
            ("api_id", &self.api_id),
            ("affiliate_id", &self.affiliate_id),
        ]);
        let qs = serde_qs::to_string(&params)?;
        let mut url = Url::parse(ENDPOINT_BASE)?.join(api)?;
        url.set_query(Some(&(auth + &qs)));
        let res = reqwest::get(url).await?;
        let text = res.text().await?;
        let res = serde_json::from_str(&text)?;
        Ok(res)
    }

    pub async fn floor_list(
        &self,
        params: FloorListParams,
    ) -> Result<ApiResponse<FloorListResult>, Box<dyn Error>> {
        self.call("FloorList", FloorList(params)).await
    }

    pub async fn author_search(
        &self,
        params: AuthorSearchParams,
    ) -> Result<ApiResponse<AuthorSearchResult>, Box<dyn Error>> {
        self.call("AuthorSearch", AuthorSearch(params)).await
    }
}

#[cfg(test)]
mod tests {
    use std::env;

    use super::*;

    #[tokio::test]
    async fn test_floor_list() {
        let api_id = env::var("DMM_API_ID").unwrap();
        let affiliate_id = env::var("DMM_AFFILIATE_ID").unwrap();
        let dmm = Dmm::new(&api_id, &affiliate_id);
        let r = dmm.floor_list(FloorListParams {}).await.unwrap();

        assert_eq!(r.result.site.get(0).unwrap().name, "DMM.com（一般）");
    }

    #[tokio::test]
    async fn test_author_search() {
        let api_id = env::var("DMM_API_ID").unwrap();
        let affiliate_id = env::var("DMM_AFFILIATE_ID").unwrap();
        let dmm = Dmm::new(&api_id, &affiliate_id);
        let r = dmm
            .author_search(AuthorSearchParams {
                floor_id: "27".to_string(),
                initial: Some('と'),
                offset: Some(100),
                ..AuthorSearchParams::default()
            })
            .await
            .unwrap();
        assert_eq!(r.result.status, "200");
    }
}