//! Sabit gelir / gider kalemleri:
//!
//! | Yöntem | Yol | İş |
//! |---|---|---|
//! | GET    | `/api/periods/{id}/plan-items`               | dönemin kalemleri |
//! | POST   | `/api/periods/{id}/plan-items`               | kalem ekle |
//! | POST   | `/api/periods/{id}/plan-items/copy-previous` | önceki dönemden kopyala |
//! | PATCH  | `/api/plan-items/{id}`                       | düzenle |
//! | DELETE | `/api/plan-items/{id}`                       | sil |

use axum::{
    Json,
    extract::{Path, 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::plan_item::{PlanItem, PlanKind},
    services::plan::{self, ItemChanges, NewItem},
    state::AppState,
};

#[derive(Deserialize, Validate, TS)]
#[ts(export, rename = "PlanItemCreateRequest", optional_fields)]
pub struct CreateRequest {
    kind: PlanKind,
    name: String,
    /// Kuruş, > 0
    #[ts(type = "number")]
    amount: i64,
    /// `"YYYY-MM-DD"`, dönem içinde (isteğe bağlı)
    date: Option<String>,
}

#[derive(Deserialize, Validate, TS)]
#[ts(export, rename = "PlanItemUpdateRequest", optional_fields)]
pub struct UpdateRequest {
    name: Option<String>,
    #[ts(type = "number", optional)]
    amount: Option<i64>,
    /// Boş metin → tarihi kaldır
    date: Option<String>,
    version: Option<i32>,
}

#[derive(Serialize, TS)]
#[ts(export, rename = "PlanItem")]
pub struct PlanItemDto {
    id: String,
    kind: PlanKind,
    name: String,
    /// Kuruş
    #[ts(type = "number")]
    amount: i64,
    date: Option<String>,
    sort_order: i32,
    version: i32,
}

#[derive(Serialize, TS)]
#[ts(export)]
pub struct CopyPreviousResult {
    /// Eklenen kalem sayısı (zaten var olanlar atlanır)
    added: usize,
}

impl From<PlanItem> for PlanItemDto {
    fn from(i: PlanItem) -> Self {
        Self {
            id: i.id.to_string(),
            kind: i.kind,
            name: i.name,
            amount: i.amount,
            date: i.date,
            sort_order: i.sort_order,
            version: i.version,
        }
    }
}

fn parse_id(id: &str) -> AppResult<Uuid> {
    Uuid::parse_str(id).map_err(|_| AppError::NotFound)
}

pub async fn list(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(period_id): Path<String>,
) -> AppResult<Json<Vec<PlanItemDto>>> {
    let items = plan::list(&s.db, auth.household_id, parse_id(&period_id)?).await?;
    Ok(Json(items.into_iter().map(PlanItemDto::from).collect()))
}

pub async fn create(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(period_id): Path<String>,
    ValidJson(req): ValidJson<CreateRequest>,
) -> AppResult<(StatusCode, Json<PlanItemDto>)> {
    let item = plan::create(
        &s.db,
        auth.household_id,
        parse_id(&period_id)?,
        NewItem {
            kind: req.kind,
            name: req.name,
            amount: req.amount,
            date: req.date,
        },
    )
    .await?;
    Ok((StatusCode::CREATED, Json(item.into())))
}

pub async fn copy_previous(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(period_id): Path<String>,
) -> AppResult<Json<CopyPreviousResult>> {
    let added = plan::copy_previous(&s.db, auth.household_id, parse_id(&period_id)?).await?;
    Ok(Json(CopyPreviousResult { added }))
}

pub async fn update(
    State(s): State<AppState>,
    auth: AuthUser,
    Path(id): Path<String>,
    ValidJson(req): ValidJson<UpdateRequest>,
) -> AppResult<Json<PlanItemDto>> {
    let item = plan::update(
        &s.db,
        auth.household_id,
        parse_id(&id)?,
        ItemChanges {
            name: req.name,
            amount: req.amount,
            date: req.date,
            version: req.version,
        },
    )
    .await?;
    Ok(Json(item.into()))
}

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