//! Recurring template objects (SPEC §14.3.3, §14.3.4 E-28, E-29).

use serde::{Deserialize, Serialize};
use utoipa::ToSchema;
use uuid::Uuid;

use super::expense::SplitMode;
use super::{
    DateSchema, OreSchema, PeriodSchema, ServerVersionSchema, TimestampSchema, UuidSchema,
};

/// Exactly one of `share_bp` / `share_ore` non-null.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, ToSchema)]
pub struct TemplateSplit {
    #[schema(value_type = UuidSchema)]
    pub user_id: Uuid,
    #[schema(schema_with = super::nullable_int, required = true)]
    pub share_bp: Option<i64>,
    #[schema(schema_with = super::nullable_int64, required = true)]
    pub share_ore: Option<i64>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, ToSchema)]
pub struct RecurringTemplate {
    #[schema(value_type = UuidSchema)]
    pub id: Uuid,
    #[schema(value_type = UuidSchema)]
    pub account_id: Uuid,
    #[schema(value_type = UuidSchema)]
    pub category_id: Uuid,
    #[schema(value_type = OreSchema)]
    pub amount_ore: i64,
    pub description: String,
    pub notes: String,
    #[schema(value_type = UuidSchema)]
    pub payer_user_id: Uuid,
    pub split_mode: SplitMode,
    /// Sorted by `user_id`; empty for mode default ([`RecurringTemplate::sort`]).
    pub splits: Vec<TemplateSplit>,
    #[schema(schema_with = super::int)]
    pub day_of_month: i64,
    #[schema(value_type = PeriodSchema)]
    pub start_period: String,
    #[schema(value_type = Option<PeriodSchema>, required = true)]
    pub end_period: Option<String>,
    pub paused: bool,
    #[schema(value_type = Option<PeriodSchema>, required = true)]
    pub last_generated_period: Option<String>,
    /// Computed with `kvitt_domain::next_occurrence_date` (SPEC §9.5).
    #[schema(value_type = Option<DateSchema>, required = true)]
    pub next_occurrence_date: Option<String>,
    #[schema(value_type = UuidSchema)]
    pub created_by_user_id: Uuid,
    #[schema(value_type = UuidSchema)]
    pub updated_by_user_id: Uuid,
    #[schema(value_type = TimestampSchema)]
    pub created_at: String,
    #[schema(value_type = TimestampSchema)]
    pub updated_at: String,
    #[schema(value_type = Option<TimestampSchema>, required = true)]
    pub deleted_at: Option<String>,
    #[schema(value_type = ServerVersionSchema)]
    pub server_version: i64,
}

impl RecurringTemplate {
    /// Sorts `splits` by `user_id` (SPEC §14.3.3).
    pub fn sort(&mut self) {
        self.splits.sort_by_key(|s| s.user_id);
    }
}

/// E-28 `POST /recurring-templates`. `splits` per SPEC §9.1: none for `default`; two bp entries for `ratio` and
/// `full`; two öre entries summing to the amount for `exact`.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, ToSchema)]
pub struct CreateRecurringTemplateRequest {
    #[schema(value_type = UuidSchema)]
    pub account_id: Uuid,
    #[schema(value_type = UuidSchema)]
    pub category_id: Uuid,
    #[schema(value_type = OreSchema)]
    pub amount_ore: i64,
    pub description: String,
    pub notes: String,
    #[schema(value_type = UuidSchema)]
    pub payer_user_id: Uuid,
    pub split_mode: SplitMode,
    pub splits: Vec<TemplateSplit>,
    #[schema(schema_with = super::int)]
    pub day_of_month: i64,
    #[schema(value_type = PeriodSchema)]
    pub start_period: String,
    #[serde(deserialize_with = "super::required_nullable")]
    #[schema(value_type = Option<PeriodSchema>, required = true)]
    pub end_period: Option<String>,
    pub paused: bool,
}

/// E-29 `PATCH /recurring-templates/{template_id}`: any subset of the E-28 fields; `split_mode` and `splits` must
/// be sent together (the schema's `dependentRequired`, added by [`patch_template_dependent_required`]).
#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize, Deserialize, ToSchema)]
#[schema(min_properties = 1)]
pub struct PatchRecurringTemplateRequest {
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = UuidSchema)]
    pub account_id: Option<Uuid>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = UuidSchema)]
    pub category_id: Option<Uuid>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = OreSchema)]
    pub amount_ore: Option<i64>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = String)]
    pub description: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = String)]
    pub notes: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = UuidSchema)]
    pub payer_user_id: Option<Uuid>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = SplitMode)]
    pub split_mode: Option<SplitMode>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = Vec<TemplateSplit>)]
    pub splits: Option<Vec<TemplateSplit>>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(schema_with = super::int)]
    pub day_of_month: Option<i64>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = PeriodSchema)]
    pub start_period: Option<String>,
    #[serde(
        default,
        deserialize_with = "super::double_option",
        skip_serializing_if = "Option::is_none"
    )]
    #[schema(value_type = Option<PeriodSchema>, required = false)]
    pub end_period: Option<Option<String>>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[schema(value_type = bool)]
    pub paused: Option<bool>,
}

/// The `dependentRequired` keyword of [`PatchRecurringTemplateRequest`]: `split_mode` and `splits` together. utoipa
/// has no attribute for it, so `openapi.rs` writes it into the generated schema.
pub fn patch_template_dependent_required() -> serde_json::Value {
    serde_json::json!({ "split_mode": ["splits"], "splits": ["split_mode"] })
}