// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

//! Types for dealing with dates, times, and custom calendars.
//!
//! This module is published as its own crate ([`icu_calendar`](https://docs.rs/icu_calendar/latest/icu_calendar/))
//! and as part of the [`icu`](https://docs.rs/icu/latest/icu/) crate. See the latter for more details on the ICU4X project.
//! The [`types`] module has a lot of common types for dealing with dates and times.
//!
//! [`Calendar`] is a trait that allows one to define custom calendars, and [`Date`]
//! can represent dates for arbitrary calendars.
//!
//! The [`Iso`] and [`Gregorian`] types are implementations for the ISO and
//! Gregorian calendars respectively. Further calendars can be found in the [`cal`] module.
//!
//! Most interaction with this crate will be done via the [`Date`] and [`DateTime`] types.
//!
//! Some of the algorithms implemented here are based on
//! Dershowitz, Nachum, and Edward M. Reingold. _Calendrical calculations_. Cambridge University Press, 2008.
//! with associated Lisp code found at <https://github.com/EdReingold/calendar-code2>.
//!
//! # Examples
//!
//! Examples of date manipulation using `Date` object. `Date` objects are useful
//! for working with dates, encompassing information about the day, month, year,
//! as well as the calendar type.
//!
//! ```rust
//! use icu::calendar::{types::IsoWeekday, Date};
//!
//! // Creating ISO date: 1992-09-02.
//! let mut date_iso = Date::try_new_iso(1992, 9, 2)
//!     .expect("Failed to initialize ISO Date instance.");
//!
//! assert_eq!(date_iso.day_of_week(), IsoWeekday::Wednesday);
//! assert_eq!(date_iso.year().era_year_or_extended(), 1992);
//! assert_eq!(date_iso.month().ordinal, 9);
//! assert_eq!(date_iso.day_of_month().0, 2);
//!
//! // Answering questions about days in month and year.
//! assert_eq!(date_iso.days_in_year(), 366);
//! assert_eq!(date_iso.days_in_month(), 30);
//! ```
//!
//! Example of converting an ISO date across Indian and Buddhist calendars.
//!
//! ```rust
//! use icu::calendar::cal::{Buddhist, Indian};
//! use icu::calendar::Date;
//!
//! // Creating ISO date: 1992-09-02.
//! let mut date_iso = Date::try_new_iso(1992, 9, 2)
//!     .expect("Failed to initialize ISO Date instance.");
//!
//! assert_eq!(date_iso.year().era_year_or_extended(), 1992);
//! assert_eq!(date_iso.month().ordinal, 9);
//! assert_eq!(date_iso.day_of_month().0, 2);
//!
//! // Conversion into Indian calendar: 1914-08-02.
//! let date_indian = date_iso.to_calendar(Indian);
//! assert_eq!(date_indian.year().era_year_or_extended(), 1914);
//! assert_eq!(date_indian.month().ordinal, 6);
//! assert_eq!(date_indian.day_of_month().0, 11);
//!
//! // Conversion into Buddhist calendar: 2535-09-02.
//! let date_buddhist = date_iso.to_calendar(Buddhist);
//! assert_eq!(date_buddhist.year().era_year_or_extended(), 2535);
//! assert_eq!(date_buddhist.month().ordinal, 9);
//! assert_eq!(date_buddhist.day_of_month().0, 2);
//! ```
//!
//! Example using `DateTime` object. Similar to `Date` objects, `DateTime` objects
//! contain an accessible `Date` object containing information about the day, month,
//! year, and calendar type. Additionally, `DateTime` objects contain an accessible
//! `Time` object, including granularity of hour, minute, second, and nanosecond.
//!
//! ```rust
//! use icu::calendar::{types::IsoWeekday, DateTime, Time};
//!
//! // Creating ISO date: 1992-09-02 8:59
//! let mut datetime_iso = DateTime::try_new_iso(1992, 9, 2, 8, 59, 0)
//!     .expect("Failed to initialize ISO DateTime instance.");
//!
//! assert_eq!(datetime_iso.date.day_of_week(), IsoWeekday::Wednesday);
//! assert_eq!(datetime_iso.date.year().era_year_or_extended(), 1992);
//! assert_eq!(datetime_iso.date.month().ordinal, 9);
//! assert_eq!(datetime_iso.date.day_of_month().0, 2);
//! assert_eq!(datetime_iso.time.hour.number(), 8);
//! assert_eq!(datetime_iso.time.minute.number(), 59);
//! assert_eq!(datetime_iso.time.second.number(), 0);
//! assert_eq!(datetime_iso.time.nanosecond.number(), 0);
//! ```
//! [`ICU4X`]: ../icu/index.html

// https://github.com/unicode-org/icu4x/blob/main/documents/process/boilerplate.md#library-annotations
#![cfg_attr(not(any(test, feature = "std")), no_std)]
#![cfg_attr(
    not(test),
    deny(
        clippy::indexing_slicing,
        clippy::unwrap_used,
        clippy::expect_used,
        clippy::panic,
        clippy::exhaustive_structs,
        clippy::exhaustive_enums,
        missing_debug_implementations,
    )
)]
#![warn(missing_docs)]

extern crate alloc;

// Make sure inherent docs go first
mod date;
mod datetime;

/// Types for individual calendars
pub mod cal {
    pub use crate::buddhist::Buddhist;
    pub use crate::chinese::Chinese;
    pub use crate::coptic::Coptic;
    pub use crate::dangi::Dangi;
    pub use crate::ethiopian::{Ethiopian, EthiopianEraStyle};
    pub use crate::gregorian::Gregorian;
    pub use crate::hebrew::Hebrew;
    pub use crate::indian::Indian;
    pub use crate::islamic::{
        IslamicCivil, IslamicObservational, IslamicTabular, IslamicUmmAlQura,
    };
    pub use crate::iso::Iso;
    pub use crate::japanese::{Japanese, JapaneseExtended};
    pub use crate::julian::Julian;
    pub use crate::persian::Persian;
    pub use crate::roc::Roc;

    pub use crate::any_calendar::AnyCalendar;

    /// Scaffolding types: You shouldn't need to use these, they need to be public for the `Calendar` trait impl to work.
    pub mod scaffold {
        pub use crate::chinese::ChineseDateInner;
        pub use crate::coptic::CopticDateInner;
        pub use crate::dangi::DangiDateInner;
        pub use crate::ethiopian::EthiopianDateInner;
        pub use crate::gregorian::GregorianDateInner;
        pub use crate::hebrew::HebrewDateInner;
        pub use crate::indian::Indian;
        pub use crate::islamic::{
            IslamicCivilDateInner, IslamicDateInner, IslamicTabularDateInner,
            IslamicUmmAlQuraDateInner,
        };
        pub use crate::iso::Iso;
        pub use crate::japanese::Japanese;
        pub use crate::julian::JulianDateInner;
        pub use crate::persian::PersianDateInner;
        pub use crate::roc::RocDateInner;

        pub use crate::any_calendar::AnyDateInner;
    }
}

pub mod any_calendar;
mod buddhist;
mod calendar;
mod calendar_arithmetic;
mod chinese;
mod chinese_based;
mod coptic;
mod dangi;
mod duration;
mod error;
mod ethiopian;
mod gregorian;
mod hebrew;
mod indian;
mod islamic;
mod iso;
#[cfg(feature = "ixdtf")]
mod ixdtf;
mod japanese;
mod julian;
mod persian;
pub mod provider;
mod roc;
#[cfg(test)]
mod tests;
pub mod types;
mod week_of;

pub mod week {
    //! Functions for week-of-month and week-of-year arithmetic.
    use crate::week_of;
    pub use week_of::RelativeUnit;
    pub use week_of::WeekCalculator;
    pub use week_of::WeekOf;
    #[doc(hidden)] // for debug-assert in datetime
    pub use week_of::MIN_UNIT_DAYS;
}

#[cfg(feature = "ixdtf")]
pub use crate::ixdtf::ParseError;
#[doc(no_inline)]
pub use any_calendar::{AnyCalendar, AnyCalendarKind};
pub use calendar::Calendar;
pub use date::{AsCalendar, Date, Ref};
pub use datetime::DateTime;
#[doc(hidden)] // unstable
pub use duration::{DateDuration, DateDurationUnit};
pub use error::{DateError, RangeError};
#[doc(no_inline)]
pub use gregorian::Gregorian;
#[doc(no_inline)]
pub use iso::Iso;
pub use types::Time;