use mongod::{
    derive::{Model, Referencable},
    Model, Validate,
};
use mongodb::bson::doc;
use serde::{Deserialize, Serialize};
use serde_json::json;

/// A Transaction of an Item Variant
#[derive(Debug, Clone, Serialize, Deserialize, Model, Referencable)]
pub struct Transaction {
    /// UUID
    pub _id: String,
    /// Associated Item
    pub item: String,
    /// Associated Variant
    pub variant: String,
    /// Price of obtaining the Item
    pub price: Price,
    /// Origin of the Item
    pub origin: Option<String>,
    /// Info on consumption of the Item
    pub consumed: Option<Consumed>,
    /// Timestamp of the Transaction
    pub timestamp: i64,
}

impl Validate for Transaction {
    async fn validate(&self) -> Result<(), String> {
        Ok(())
    }
}

/// Information about consumed Items
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Consumed {
    /// Destination of the Item or who consumed it
    pub destination: String,
    /// Price the Item was exported or consumed at
    pub price: Price,
    /// Timestamp of Consumption
    pub timestamp: i64,
}

impl Transaction {
    pub fn new(item: &str, variant: &str, price: Price, origin: Option<&str>) -> Self {
        Self {
            _id: uuid::Uuid::new_v4().to_string(),
            item: item.to_string(),
            variant: variant.to_string(),
            price,
            consumed: None,
            origin: origin.map(|x| x.to_string()),
            timestamp: chrono::Utc::now().timestamp(),
        }
    }

    /// Consumes the Item with `price` and `destination`
    pub async fn consume(&mut self, price: Price, destination: &str) {
        self.update(&json!({
            "consumed": Consumed{destination: destination.to_string(),price, timestamp: chrono::Utc::now().timestamp() }
        }))
        .await
        .ok().unwrap()
    }

    pub fn api_json(&self) -> serde_json::Value {
        json!({
            "uuid": self._id,
            "item": self.item,
            "variant": self.variant,
            "price": self.price,
            "origin": self.origin,
            "timestamp": self.timestamp,
            "consumed": self.consumed
        })
    }
}

/// Economic Price
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Price {
    /// Value of the currency
    pub value: f64,
    /// Kind of currency
    pub currency: String,
}

impl Price {
    pub fn new(value: f64, currency: &str) -> Self {
        Self {
            value,
            currency: currency.to_string(),
        }
    }

    fn parse(price: &str) -> Option<Self> {
        let (value, currency) = price.split_once(' ')?;

        Some(Self {
            value: value.parse().ok()?,
            currency: currency.to_string(),
        })
    }
}

impl TryFrom<String> for Price {
    type Error = ();

    fn try_from(value: String) -> Result<Self, Self::Error> {
        Self::parse(&value).ok_or(())
    }
}