//! Panel (Dashboard) uç noktaları (hanenin tüm üyeleri):
//!
//! | Yöntem | Yol | İş |
//! |---|---|---|
//! | GET | `/api/periods/{id}/daily`     | dönemin her günü: 4 grubun harcaması |
//! | GET | `/api/stats/periods?limit=12` | son dönemler (eskiden yeniye): gelir, sabit gider, devirler, harcanabilir, harcanan, gerçekleşen birikim, birikime aktarılan + toplam birikim |

use axum::{
    Json,
    extract::{Path, Query, State},
};
use mongodb::bson::Uuid;
use serde::{Deserialize, Serialize};
use ts_rs::TS;

use crate::{
    auth::AuthUser,
    error::{AppError, AppResult},
    models::period::PeriodStatus,
    routes::budget::GroupAmounts,
    services::{
        calendar::{format_date, parse_date},
        stats,
    },
    state::AppState,
};

#[derive(Serialize, TS)]
#[ts(export, rename = "DaySpent")]
pub struct DayDto {
    /// `"YYYY-MM-DD"`
    date: String,
    /// O gün gruplara göre harcanan (kuruş)
    spent: GroupAmounts,
}

pub async fn daily(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(id): Path<String>,
) -> AppResult<Json<Vec<DayDto>>> {
    let id = Uuid::parse_str(&id).map_err(|_| AppError::NotFound)?;
    let days = stats::daily(&s.db, auth.household_id, id).await?;
    Ok(Json(
        days.into_iter()
            .map(|d| DayDto {
                date: d.date,
                spent: d.spent.into(),
            })
            .collect(),
    ))
}

#[derive(Deserialize)]
pub struct StatsQuery {
    limit: Option<usize>,
}

#[derive(Serialize, TS)]
#[ts(export, rename = "PeriodStats")]
pub struct StatsDto {
    /// Kapanışlarda birikime aktarılanların toplamı (kuruş)
    #[ts(type = "number")]
    total_saved: i64,
    /// Eskiden yeniye
    periods: Vec<PeriodStatDto>,
}

#[derive(Serialize, TS)]
#[ts(export, rename = "PeriodStat")]
struct PeriodStatDto {
    id: String,
    name: String,
    start_date: String,
    /// Son gün, dahil
    last_date: String,
    status: PeriodStatus,
    #[ts(type = "number")]
    income_total: i64,
    #[ts(type = "number")]
    fixed_expense_total: i64,
    #[ts(type = "number")]
    savings_goal: i64,
    #[ts(type = "number")]
    carryover_debt: i64,
    #[ts(type = "number")]
    carryover_surplus: i64,
    #[ts(type = "number")]
    spendable: i64,
    #[ts(type = "number")]
    spent: i64,
    /// Harcanan, gruplara göre
    spent_by_group: GroupAmounts,
    /// Gelir − sabit − borç + artı − harcanan (negatifse açık). Birikim oranı = bu ÷ gelir
    #[ts(type = "number")]
    realized_savings: i64,
    /// Kapanmamışsa `null`
    #[ts(type = "number | null")]
    to_savings: Option<i64>,
}

pub async fn periods(
    State(s): State<AppState>,
    auth: AuthUser,
    Query(q): Query<StatsQuery>,
) -> AppResult<Json<StatsDto>> {
    let st = stats::periods(&s.db, auth.household_id, q.limit.unwrap_or(12)).await?;
    Ok(Json(StatsDto {
        total_saved: st.total_saved,
        periods: st
            .periods
            .into_iter()
            .map(|x| {
                let end = parse_date(&x.period.end_date).expect("geçerli bitiş tarihi");
                PeriodStatDto {
                    realized_savings: x.realized_savings(),
                    id: x.period.id.to_string(),
                    name: x.period.name,
                    start_date: x.period.start_date,
                    last_date: format_date(end - time::Duration::days(1)),
                    status: x.period.status,
                    income_total: x.summary.income_total,
                    fixed_expense_total: x.summary.fixed_expense_total,
                    savings_goal: x.summary.savings_goal,
                    carryover_debt: x.summary.carryover_debt,
                    carryover_surplus: x.summary.carryover_surplus,
                    spendable: x.summary.spendable,
                    spent: x.summary.spent_total,
                    spent_by_group: x.summary.spent_by_group.into(),
                    to_savings: x.period.to_savings,
                }
            })
            .collect(),
    }))
}