use serde::{Deserialize, Serialize};
use thiserror::Error;
use chrono::prelude::*;

pub type Campaigns = Vec<Object<Campaign>>;
pub type Pledges = Vec<Object<Pledge>>;
pub type Users = Vec<Object<User>>;

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Campaign {
    pub summary: String,
    pub creation_name: String,
    pub display_patron_goals: bool,
    pub pay_per_name: String,
    pub one_liner: Option<String>,
    pub main_video_embed: Option<String>,
    pub main_video_url: Option<String>,
    pub image_small_url: String,
    pub image_url: String,
    pub thanks_video_url: Option<String>,
    pub thanks_embed: Option<String>,
    pub thanks_msg: String,
    pub is_charged_immediately: bool,
    pub is_monthly: bool,
    pub is_nsfw: bool,
    pub is_plural: bool,
    pub created_at: DateTime<Utc>,
    pub published_at: DateTime<Utc>,
    pub pledge_url: String,
    pub pledge_sum: i32,
    pub patron_count: u32,
    pub creation_count: u32,
    pub outstanding_payment_amount_cents: u64,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Pledge {
    pub amount_cents: u32,
    pub created_at: String,
    pub declined_since: Option<String>,
    pub pledge_cap_cents: u32,
    pub patron_pays_fees: bool,
    pub total_historical_amount_cents: Option<u32>,
    pub is_paused: Option<bool>,
    pub has_shipping_address: Option<bool>,
    pub outstanding_payment_amount_cents: Option<u32>,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct User {
    pub first_name: String,
    pub last_name: String,
    pub full_name: String,
    pub vanity: Option<String>,
    pub about: Option<String>,
    pub gender: i32,
    pub image_url: String,
    pub thumb_url: String,
    pub created: DateTime<Utc>,
    pub url: String,
}

pub type Result<T> = std::result::Result<T, Error>;

#[derive(Error, Debug)]
pub enum Error {
    #[error("json error: {0:?}")]
    Json(#[from] serde_json::Error),
    #[error("request error: {0:?}")]
    Request(#[from] reqwest::Error),
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Credentials {
    pub client_id: String,
    pub client_secret: String,
    pub access_token: String,
    pub refresh_token: String,
}

pub struct Client {
    cli: reqwest::Client,
    base_url: String,
    creds: Credentials,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Data<T, U> {
    pub data: T,
    pub included: Option<Vec<U>>,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Object<T> {
    pub id: String,
    pub attributes: T,
    pub r#type: String,
    pub links: Option<Links>,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Links {
    related: String,
}

impl Client {
    pub fn new(creds: Credentials) -> Self {
        Self {
            cli: reqwest::Client::new(),
            base_url: "https://api.patreon.com".into(),
            creds: creds,
        }
    }

    pub async fn campaign(&self) -> Result<Data<Vec<Object<Campaign>>, ()>> {
        let data = self
            .cli
            .get(&format!(
                "{}/oauth2/api/current_user/campaigns",
                self.base_url
            ))
            .query(&[("include", "patron.null"), ("includes", "")])
            .header(
                "Authorization",
                format!("Bearer {}", self.creds.access_token),
            )
            .send()
            .await?
            .error_for_status()?.text().await?;
        log::debug!("campaign response: {}", data);
        Ok(serde_json::from_str(&data)?)
    }

    pub async fn pledges(&self, camp_id: String) -> Result<Vec<Object<User>>> {
        let data = self
            .cli
            .get(&format!(
                "{}/oauth2/api/campaigns/{}/pledges",
                self.base_url, camp_id
            ))
            .query(&[("include", "patron.null")])
            .header(
                "Authorization",
                format!("Bearer {}", self.creds.access_token),
            )
            .send()
            .await?
            .error_for_status()?
            .text()
            .await?;
        log::debug!("pledges for {}: {}", camp_id, data);
        let data : Data<Vec<Object<Pledge>>, Object<User>> = serde_json::from_str(&data)?;
        Ok(data.included.unwrap())
    }
}