// 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 ).

#[diplomat::bridge]
#[diplomat::abi_rename = "icu4x_{0}_mv1"]
#[diplomat::attr(auto, namespace = "icu4x")]
pub mod ffi {
    use alloc::boxed::Box;

    use crate::{errors::ffi::DataError, provider::ffi::DataProvider};

    /// Lookup of the Canonical_Combining_Class Unicode property
    #[diplomat::opaque]
    #[diplomat::rust_link(icu::normalizer::properties::CanonicalCombiningClassMap, Struct)]
    #[diplomat::rust_link(
        icu::normalizer::properties::CanonicalCombiningClassMapBorrowed,
        Struct,
        hidden
    )]
    pub struct CanonicalCombiningClassMap(
        pub icu_normalizer::properties::CanonicalCombiningClassMap,
    );

    impl CanonicalCombiningClassMap {
        /// Construct a new CanonicalCombiningClassMap instance for NFC
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCombiningClassMap::new,
            FnInStruct
        )]
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCombiningClassMapBorrowed::new,
            FnInStruct,
            hidden
        )]
        #[diplomat::attr(supports = fallible_constructors, constructor)]
        pub fn create(
            provider: &DataProvider,
        ) -> Result<Box<CanonicalCombiningClassMap>, DataError> {
            Ok(Box::new(CanonicalCombiningClassMap(call_constructor!(
                icu_normalizer::properties::CanonicalCombiningClassMap::new [r => Ok(r.static_to_owned())],
                icu_normalizer::properties::CanonicalCombiningClassMap::try_new_with_any_provider,
                icu_normalizer::properties::CanonicalCombiningClassMap::try_new_with_buffer_provider,
                provider
            )?)))
        }

        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCombiningClassMapBorrowed::get,
            FnInStruct
        )]
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCombiningClassMapBorrowed::get32,
            FnInStruct,
            hidden
        )]
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCombiningClassMapBorrowed::get32_u8,
            FnInStruct,
            hidden
        )]
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCombiningClassMapBorrowed::get_u8,
            FnInStruct,
            hidden
        )]
        #[diplomat::rust_link(
            icu::properties::properties::CanonicalCombiningClassMapBorrowed,
            Struct,
            compact
        )]
        #[diplomat::attr(auto, indexer)]
        pub fn get(&self, ch: DiplomatChar) -> u8 {
            self.0.as_borrowed().get32_u8(ch)
        }
    }

    /// The raw canonical composition operation.
    ///
    /// Callers should generally use ComposingNormalizer unless they specifically need raw composition operations
    #[diplomat::opaque]
    #[diplomat::rust_link(icu::normalizer::properties::CanonicalComposition, Struct)]
    #[diplomat::rust_link(
        icu::normalizer::properties::CanonicalCompositionBorrowed,
        Struct,
        hidden
    )]
    pub struct CanonicalComposition(pub icu_normalizer::properties::CanonicalComposition);

    impl CanonicalComposition {
        /// Construct a new CanonicalComposition instance for NFC
        #[diplomat::rust_link(icu::normalizer::properties::CanonicalComposition::new, FnInStruct)]
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCompositionBorrowed::new,
            FnInStruct,
            hidden
        )]
        #[diplomat::attr(supports = fallible_constructors, constructor)]
        pub fn create(provider: &DataProvider) -> Result<Box<CanonicalComposition>, DataError> {
            Ok(Box::new(CanonicalComposition(call_constructor!(
                icu_normalizer::properties::CanonicalComposition::new [r => Ok(r.static_to_owned())],
                icu_normalizer::properties::CanonicalComposition::try_new_with_any_provider,
                icu_normalizer::properties::CanonicalComposition::try_new_with_buffer_provider,
                provider,
            )?)))
        }

        /// Performs canonical composition (including Hangul) on a pair of characters
        /// or returns NUL if these characters don’t compose. Composition exclusions are taken into account.
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalCompositionBorrowed::compose,
            FnInStruct
        )]
        pub fn compose(&self, starter: DiplomatChar, second: DiplomatChar) -> DiplomatChar {
            match (char::from_u32(starter), char::from_u32(second)) {
                (Some(starter), Some(second)) => self.0.as_borrowed().compose(starter, second),
                _ => None,
            }
            .unwrap_or('\0') as DiplomatChar
        }
    }

    /// The outcome of non-recursive canonical decomposition of a character.
    /// `second` will be NUL when the decomposition expands to a single character
    /// (which may or may not be the original one)
    #[diplomat::rust_link(icu::normalizer::properties::Decomposed, Enum)]
    #[diplomat::out]
    pub struct Decomposed {
        first: DiplomatChar,
        second: DiplomatChar,
    }

    /// The raw (non-recursive) canonical decomposition operation.
    ///
    /// Callers should generally use DecomposingNormalizer unless they specifically need raw composition operations
    #[diplomat::opaque]
    #[diplomat::rust_link(icu::normalizer::properties::CanonicalDecomposition, Struct)]
    #[diplomat::rust_link(
        icu::normalizer::properties::CanonicalDecompositionBorrowed,
        Struct,
        hidden
    )]
    pub struct CanonicalDecomposition(pub icu_normalizer::properties::CanonicalDecomposition);

    impl CanonicalDecomposition {
        /// Construct a new CanonicalDecomposition instance for NFC
        #[diplomat::rust_link(icu::normalizer::properties::CanonicalDecomposition::new, FnInStruct)]
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalDecompositionBorrowed::new,
            FnInStruct,
            hidden
        )]
        #[diplomat::attr(supports = fallible_constructors, constructor)]
        pub fn create(provider: &DataProvider) -> Result<Box<CanonicalDecomposition>, DataError> {
            Ok(Box::new(CanonicalDecomposition(call_constructor!(
                icu_normalizer::properties::CanonicalDecomposition::new [r => Ok(r.static_to_owned())],
                icu_normalizer::properties::CanonicalDecomposition::try_new_with_any_provider,
                icu_normalizer::properties::CanonicalDecomposition::try_new_with_buffer_provider,
                provider,
            )?)))
        }

        /// Performs non-recursive canonical decomposition (including for Hangul).
        #[diplomat::rust_link(
            icu::normalizer::properties::CanonicalDecompositionBorrowed::decompose,
            FnInStruct
        )]
        pub fn decompose(&self, c: DiplomatChar) -> Decomposed {
            match char::from_u32(c) {
                Some(c) => match self.0.as_borrowed().decompose(c) {
                    icu_normalizer::properties::Decomposed::Default => Decomposed {
                        first: c as DiplomatChar,
                        second: '\0' as DiplomatChar,
                    },
                    icu_normalizer::properties::Decomposed::Singleton(s) => Decomposed {
                        first: s as DiplomatChar,
                        second: '\0' as DiplomatChar,
                    },
                    icu_normalizer::properties::Decomposed::Expansion(first, second) => {
                        Decomposed {
                            first: first as DiplomatChar,
                            second: second as DiplomatChar,
                        }
                    }
                },
                _ => Decomposed {
                    first: c,
                    second: '\0' as DiplomatChar,
                },
            }
        }
    }
}