//! Günlük defter uç noktaları (hanenin tüm üyeleri):
//!
//! | Yöntem | Yol | İş |
//! |---|---|---|
//! | GET    | `/api/periods/{id}/entries?from=&to=` | dönemin kayıtları (tarih aralığı isteğe bağlı, ikisi de dahil) |
//! | POST   | `/api/periods/{id}/entries`           | harcama ekle |
//! | PATCH  | `/api/entries/{id}`                   | düzenle |
//! | DELETE | `/api/entries/{id}`                   | sil (soft) |
//! | POST   | `/api/entries/{id}/restore`           | silmeyi geri al |

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

use crate::{
    auth::AuthUser,
    error::{AppError, AppResult},
    extract::ValidJson,
    models::{entry::Entry, group::Group},
    services::entry::{self, EntryChanges, EntryFilter, NewEntry},
    state::AppState,
};

#[derive(Deserialize, Validate, TS)]
#[ts(export, rename = "EntryCreateRequest", optional_fields)]
pub struct CreateRequest {
    /// `"YYYY-MM-DD"`, dönem içinde
    date: String,
    /// Kuruş, > 0
    #[ts(type = "number")]
    amount: i64,
    /// Grup kategoriden alınır
    category_id: String,
    payment_method_id: Option<String>,
    description: Option<String>,
}

#[derive(Deserialize, Validate, TS)]
#[ts(export, rename = "EntryUpdateRequest", optional_fields)]
pub struct UpdateRequest {
    date: Option<String>,
    #[ts(type = "number", optional)]
    amount: Option<i64>,
    category_id: Option<String>,
    /// Boş metin → ödeme türünü kaldır
    payment_method_id: Option<String>,
    /// Boş metin → açıklamayı kaldır
    description: Option<String>,
    version: Option<i32>,
}

#[derive(Deserialize)]
pub struct ListQuery {
    from: Option<String>,
    to: Option<String>,
}

#[derive(Serialize, TS)]
#[ts(export, rename = "Entry")]
pub struct EntryDto {
    id: String,
    period_id: String,
    date: String,
    /// Kuruş
    #[ts(type = "number")]
    amount: i64,
    group: Group,
    category_id: String,
    payment_method_id: Option<String>,
    description: Option<String>,
    created_by: String,
    version: i32,
}

impl From<Entry> for EntryDto {
    fn from(e: Entry) -> Self {
        Self {
            id: e.id.to_string(),
            period_id: e.period_id.to_string(),
            date: e.date,
            amount: e.amount,
            group: e.group,
            category_id: e.category_id.to_string(),
            payment_method_id: e.payment_method_id.map(|u| u.to_string()),
            description: e.description,
            created_by: e.created_by.to_string(),
            version: e.version,
        }
    }
}

/// Adresteki kimlik → geçersizse 404
fn path_id(id: &str) -> AppResult<Uuid> {
    Uuid::parse_str(id).map_err(|_| AppError::NotFound)
}

/// Gövdedeki kimlik → geçersizse 400 (ör. kategori seçilmemiş)
fn body_id(id: &str, what: &str) -> AppResult<Uuid> {
    Uuid::parse_str(id.trim()).map_err(|_| AppError::BadRequest(format!("{what} geçersiz")))
}

pub async fn list(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(period_id): Path<String>,
    Query(q): Query<ListQuery>,
) -> AppResult<Json<Vec<EntryDto>>> {
    let items = entry::list(
        &s.db,
        auth.household_id,
        path_id(&period_id)?,
        EntryFilter {
            from: q.from,
            to: q.to,
        },
    )
    .await?;
    Ok(Json(items.into_iter().map(EntryDto::from).collect()))
}

pub async fn create(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(period_id): Path<String>,
    ValidJson(req): ValidJson<CreateRequest>,
) -> AppResult<(StatusCode, Json<EntryDto>)> {
    let payment_method_id = match req.payment_method_id.as_deref().map(str::trim) {
        None | Some("") => None,
        Some(id) => Some(body_id(id, "Ödeme türü")?),
    };
    let e = entry::create(
        &s.db,
        auth.household_id,
        auth.user_id,
        path_id(&period_id)?,
        NewEntry {
            date: req.date,
            amount: req.amount,
            category_id: body_id(&req.category_id, "Kategori")?,
            payment_method_id,
            description: req.description,
        },
    )
    .await?;
    Ok((StatusCode::CREATED, Json(e.into())))
}

pub async fn update(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(id): Path<String>,
    ValidJson(req): ValidJson<UpdateRequest>,
) -> AppResult<Json<EntryDto>> {
    let payment_method_id = match req.payment_method_id.as_deref().map(str::trim) {
        None => None,
        Some("") => Some(None),
        Some(pm) => Some(Some(body_id(pm, "Ödeme türü")?)),
    };
    let category_id = req
        .category_id
        .as_deref()
        .map(|c| body_id(c, "Kategori"))
        .transpose()?;
    let e = entry::update(
        &s.db,
        auth.household_id,
        path_id(&id)?,
        EntryChanges {
            date: req.date,
            amount: req.amount,
            category_id,
            payment_method_id,
            description: req.description,
            version: req.version,
        },
    )
    .await?;
    Ok(Json(e.into()))
}

pub async fn delete(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(id): Path<String>,
) -> AppResult<StatusCode> {
    entry::delete(&s.db, auth.household_id, path_id(&id)?).await?;
    Ok(StatusCode::NO_CONTENT)
}

pub async fn restore(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(id): Path<String>,
) -> AppResult<Json<EntryDto>> {
    let e = entry::restore(&s.db, auth.household_id, path_id(&id)?).await?;
    Ok(Json(e.into()))
}