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

use crate::transaction::{Consumed, Price, Transaction};

/// Represents a specific instance of an item with potential variations.
///
/// This struct is used to describe a particular variation or instance of an item
/// in the real world. It may include attributes or properties that deviate from
/// the standard definition of the item. For example, different colors, sizes, or
/// configurations.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct Variant {
    /// Associated Item
    pub item: String,
    /// Variant Name
    pub variant: String,
    /// Amount of items this variant represents
    pub amount: u64,
    /// Dependencies for the item variant.
    pub depends: Vec<String>,
}

impl Variant {
    /// Create variant from itemdb yaml
    pub fn from_yml(json: &serde_yaml::Value, variant: &str, item: &str) -> Self {
        Self {
            item: item.to_string(),
            variant: variant.to_string(),
            amount: json
                .as_mapping()
                .unwrap()
                .get("amount")
                .map_or(1, |x| x.as_u64().unwrap()),
            depends: json
                .as_mapping()
                .unwrap()
                .get("depends")
                .map(|x| {
                    x.as_sequence()
                        .unwrap()
                        .iter()
                        .map(|x| x.as_str().unwrap().to_string())
                        .collect()
                })
                .unwrap_or_default(),
        }
    }

    pub async fn supply_log(&self) -> Vec<String> {
        let filter = doc! {
            "item": &self.item,
            "variant": &self.variant
        };

        let result = Transaction::find_partial(filter, json!({}), None).await.unwrap();

        let mut ret = Vec::new();

        for doc in result {
            ret.push(doc._id);
        }

        ret
    }

    pub async fn demand_log(&self) -> Vec<String> {
        let filter = doc! {
            "item": &self.item,
            "variant": &self.variant,
            "consumed": { "$exists": true }
        };

        let result = Transaction::find_partial(filter, json!({}), None).await.unwrap();

        let mut ret = Vec::new();

        for doc in result {
            ret.push(doc._id);
        }

        ret
    }

    pub async fn demand(uuid: &str, price: Price, destination: &str) -> Option<()> {
        // check if transaction exists
        let mut t = Transaction::get(uuid).await?;
        t.update(&json!({
            "consumed": Consumed{ destination: destination.to_string(), price }
        })).await.ok()?;

        Some(())
    }

    /// Records a supply transaction in the database.
    ///
    /// # Arguments
    ///
    /// * `price` - The price of the supplied items.
    /// * `origin` - The origin or source of the supplied items.
    ///
    /// # Returns
    ///
    /// Returns a UUID string representing the transaction.
    pub async fn supply(&self, price: Price, origin: Option<&str>) -> String {
        let t = Transaction::new(&self.item, &self.variant, price, origin);

        t.insert().await.unwrap();

        t._id
    }

    pub fn api_json(&self) -> serde_json::Value {
        json!({
            "item": self.item,
            "variant": self.variant,
            "amount": self.amount as u32,
            "depends": self.depends
        })
    }
}