//! Kur ve portföy uç noktaları (hanenin tüm üyeleri):
//!
//! | Yöntem | Yol | İş |
//! |---|---|---|
//! | GET    | `/api/portfolio`   | varlıklar + güncel kur, değer, kâr/zarar + toplamlar + son kur çekimi |
//! | POST   | `/api/rates`       | elle kur (hanenin; aynı gün tekrar → güncellenir) |
//! | DELETE | `/api/rates/{id}`  | elle kuru sil → otomatik kura dön |

use axum::{
    Json,
    extract::{Path, State},
    http::StatusCode,
};
use mongodb::bson::{DateTime, Uuid};
use serde::{Deserialize, Serialize};
use ts_rs::TS;
use validator::Validate;

use crate::{
    auth::AuthUser,
    error::{AppError, AppResult},
    extract::ValidJson,
    models::rate::Rate,
    routes::asset::AssetDto,
    services::rates,
};

#[derive(Serialize, TS)]
#[ts(export, rename = "Rate")]
pub struct RateDto {
    id: String,
    code: String,
    /// TL × 1e6, birim başına
    #[ts(type = "number")]
    rate_e6: i64,
    /// `tcmb` · `xaus` · `manual`
    #[ts(type = "\"tcmb\" | \"xaus\" | \"manual\"")]
    source: String,
    rate_date: String,
    /// ISO 8601
    fetched_at: String,
    is_manual: bool,
}

fn iso(d: DateTime) -> String {
    d.try_to_rfc3339_string().unwrap_or_default()
}

impl From<Rate> for RateDto {
    fn from(r: Rate) -> Self {
        Self {
            id: r.id.to_string(),
            is_manual: r.is_manual(),
            code: r.code,
            rate_e6: r.rate_e6,
            source: r.source,
            rate_date: r.rate_date,
            fetched_at: iso(r.fetched_at),
        }
    }
}

#[derive(Serialize, TS)]
#[ts(export, rename = "PortfolioItem")]
struct ItemDto {
    asset: AssetDto,
    /// TL'de ve kur yoksa `null`
    rate: Option<RateDto>,
    /// Güncel değer (kuruş); kur yoksa `null`
    #[ts(type = "number | null")]
    value: Option<i64>,
    /// Değer − eldeki maliyet (kuruş)
    #[ts(type = "number | null")]
    unrealized_pl: Option<i64>,
}

#[derive(Serialize, TS)]
#[ts(export, rename = "Portfolio")]
pub struct PortfolioDto {
    items: Vec<ItemDto>,
    /// Eldeki maliyet toplamı (kuruş)
    #[ts(type = "number")]
    cost_total: i64,
    /// Kuru olanların güncel değeri (kuruş)
    #[ts(type = "number")]
    value_total: i64,
    /// Kuru olanlarda değer − maliyet
    #[ts(type = "number")]
    unrealized_pl_total: i64,
    #[ts(type = "number")]
    realized_pl_total: i64,
    /// Elde olup kuru bulunmayan varlık sayısı (toplama girmedi)
    unpriced: u32,
    /// Son otomatik kur çekimi (ISO); hiç yoksa `null`
    last_fetch: Option<String>,
}

pub async fn portfolio(
    State(s): State<crate::state::AppState>,
    auth: AuthUser,
) -> AppResult<Json<PortfolioDto>> {
    let p = rates::portfolio(&s.db, auth.household_id).await?;
    let mut dto = PortfolioDto {
        items: Vec::with_capacity(p.items.len()),
        cost_total: 0,
        value_total: 0,
        unrealized_pl_total: 0,
        realized_pl_total: 0,
        unpriced: 0,
        last_fetch: p.last_fetch.map(iso),
    };
    for v in p.items {
        let h = v.holding;
        dto.cost_total += h.cost;
        dto.realized_pl_total += h.realized_pl;
        let unrealized = v.value.map(|x| x - h.cost);
        match v.value {
            Some(x) => {
                dto.value_total += x;
                dto.unrealized_pl_total += x - h.cost;
            }
            None if h.quantity_e6 > 0 => dto.unpriced += 1,
            None => {}
        }
        dto.items.push(ItemDto {
            asset: AssetDto::new(v.asset, h, v.tx_count),
            rate: v.rate.map(RateDto::from),
            value: v.value,
            unrealized_pl: unrealized,
        });
    }
    Ok(Json(dto))
}

#[derive(Deserialize, Validate, TS)]
#[ts(export, rename = "RateCreateRequest", optional_fields)]
pub struct CreateRequest {
    /// Varlık kodu (`XAU_CEYREK`, `USD`…)
    code: String,
    /// TL × 1e6, birim başına
    #[ts(type = "number")]
    rate_e6: i64,
    /// Boşsa bugün
    rate_date: Option<String>,
}

pub async fn create(
    State(s): State<crate::state::AppState>,
    auth: AuthUser,
    ValidJson(req): ValidJson<CreateRequest>,
) -> AppResult<(StatusCode, Json<RateDto>)> {
    let r = rates::set_manual(
        &s.db,
        auth.household_id,
        &req.code,
        req.rate_e6,
        req.rate_date.as_deref(),
    )
    .await?;
    Ok((StatusCode::CREATED, Json(r.into())))
}

pub async fn delete(
    State(s): State<crate::state::AppState>,
    auth: AuthUser,
    Path(id): Path<String>,
) -> AppResult<StatusCode> {
    let id = Uuid::parse_str(&id).map_err(|_| AppError::NotFound)?;
    rates::delete_manual(&s.db, auth.household_id, id).await?;
    Ok(StatusCode::NO_CONTENT)
}