api_response/error_code/
helper.rs

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use std::fmt::Display;

use super::{CodeSegment, ErrorCode};
use crate::{ApiError, MaybeString};

/// A builder for quickly creating `ApiError`.
#[derive(Debug)]
pub struct ApiErr {
    pub(crate) intro: &'static str,
    pub(crate) s1: Option<CodeSegment>,
    pub(crate) s2: Option<CodeSegment>,
    pub(crate) s3: Option<CodeSegment>,
}

impl ApiErr {
    /// Create an `ApiError` builder with an error code format of `{ErrorCode}`.
    pub const fn new0() -> Self {
        Self {
            intro: "",
            s1: None,
            s2: None,
            s3: None,
        }
    }
    /// Create an `ApiError` builder with an error code format of
    /// `{ErrorCode}{CodeSegment}`.
    pub const fn new1(s1: CodeSegment) -> Self {
        Self {
            intro: "",
            s1: Some(s1),
            s2: None,
            s3: None,
        }
    }
    /// Create an `ApiError` builder with an error code format of
    /// `{ErrorCode}{CodeSegment}{CodeSegment}`.
    pub const fn new2(s1: CodeSegment, s2: CodeSegment) -> Self {
        Self {
            intro: "",
            s1: Some(s1),
            s2: Some(s2),
            s3: None,
        }
    }
    /// Create an `ApiError` builder with an error code format of
    /// `{ErrorCode}{CodeSegment}{CodeSegment}{CodeSegment}`.
    pub const fn new3(s1: CodeSegment, s2: CodeSegment, s3: CodeSegment) -> Self {
        Self {
            intro: "",
            s1: Some(s1),
            s2: Some(s2),
            s3: Some(s3),
        }
    }
    pub const fn intro(mut self, intro: &'static str) -> Self {
        self.intro = intro;
        self
    }
    fn new_api_error(&self, error_code: ErrorCode, message: impl Into<MaybeString>) -> ApiError {
        if let Some(s3) = self.s3 {
            return error_code.api_error3(
                self.s1.expect("Initialize with new3."),
                self.s2.expect("Initialize with new3."),
                s3,
                message,
            );
        }
        if let Some(s2) = self.s2 {
            return error_code.api_error2(self.s1.expect("Initialize with new2."), s2, message);
        }
        if let Some(s1) = self.s1 {
            return error_code.api_error1(s1, message);
        }
        error_code.api_error0(message)
    }
    pub fn cancelled(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::CANCELLED, message)
    }
    pub fn unknown(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNKNOWN, message)
    }
    pub fn invalid_argument(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::INVALID_ARGUMENT, message)
    }
    pub fn deadline_exceeded(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::DEADLINE_EXCEEDED, message)
    }
    pub fn not_found(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::NOT_FOUND, message)
    }
    pub fn already_exists(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::ALREADY_EXISTS, message)
    }
    pub fn permission_denied(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::PERMISSION_DENIED, message)
    }
    pub fn resource_exhausted(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::RESOURCE_EXHAUSTED, message)
    }
    pub fn failed_precondition(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::FAILED_PRECONDITION, message)
    }
    pub fn aborted(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::ABORTED, message)
    }
    pub fn out_of_range(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::OUT_OF_RANGE, message)
    }
    pub fn unimplemented(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNIMPLEMENTED, message)
    }
    pub fn internal(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::INTERNAL, message)
    }
    pub fn unavailable(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNAVAILABLE, message)
    }
    pub fn data_loss(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::DATA_LOSS, message)
    }
    pub fn unauthenticated(&self, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNAUTHENTICATED, message)
    }
}

/// A builder for quickly creating `ApiError` that allows flexible specification
/// of the last segment.
pub struct ApiErrX {
    intro: &'static str,
    s1: Option<CodeSegment>,
    s2: Option<CodeSegment>,
}

impl ApiErrX {
    /// Create an `ApiError` builder with an error code format of
    /// `{ErrorCode}{CodeSegment}`.
    pub const fn new1() -> Self {
        Self {
            intro: "",
            s1: None,
            s2: None,
        }
    }
    /// Create an `ApiError` builder with an error code format of
    /// `{ErrorCode}{CodeSegment}{CodeSegment}`.
    pub const fn new2(s1: CodeSegment) -> Self {
        Self {
            intro: "",
            s1: Some(s1),
            s2: None,
        }
    }
    /// Create an `ApiError` builder with an error code format of
    /// `{ErrorCode}{CodeSegment}{CodeSegment}{CodeSegment}`.
    pub const fn new3(s1: CodeSegment, s2: CodeSegment) -> Self {
        Self {
            intro: "",
            s1: Some(s1),
            s2: Some(s2),
        }
    }
    pub const fn intro(mut self, intro: &'static str) -> Self {
        self.intro = intro;
        self
    }
    fn new_api_error(&self, error_code: ErrorCode, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        if let Some(s2) = self.s2 {
            return error_code.api_error3(self.s1.expect("Initialize with new3."), s2, s, message);
        }
        if let Some(s1) = self.s1 {
            return error_code.api_error2(s1, s, message);
        }
        error_code.api_error1(s, message)
    }
    pub fn cancelled(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::CANCELLED, s, message)
    }
    pub fn unknown(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNKNOWN, s, message)
    }
    pub fn invalid_argument(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::INVALID_ARGUMENT, s, message)
    }
    pub fn deadline_exceeded(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::DEADLINE_EXCEEDED, s, message)
    }
    pub fn not_found(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::NOT_FOUND, s, message)
    }
    pub fn already_exists(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::ALREADY_EXISTS, s, message)
    }
    pub fn permission_denied(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::PERMISSION_DENIED, s, message)
    }
    pub fn resource_exhausted(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::RESOURCE_EXHAUSTED, s, message)
    }
    pub fn failed_precondition(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::FAILED_PRECONDITION, s, message)
    }
    pub fn aborted(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::ABORTED, s, message)
    }
    pub fn out_of_range(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::OUT_OF_RANGE, s, message)
    }
    pub fn unimplemented(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNIMPLEMENTED, s, message)
    }
    pub fn internal(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::INTERNAL, s, message)
    }
    pub fn unavailable(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNAVAILABLE, s, message)
    }
    pub fn data_loss(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::DATA_LOSS, s, message)
    }
    pub fn unauthenticated(&self, s: CodeSegment, message: impl Into<MaybeString>) -> ApiError {
        self.new_api_error(ErrorCode::UNAUTHENTICATED, s, message)
    }
}

impl Display for ApiErr {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        const A: &str = "**";
        write!(
            f,
            "[??{:0>2}{:0>2}{:0>2}]: {}",
            self.s1.map_or_else(|| A.to_owned(), |v| (i32::from(v)).to_string()),
            self.s2.map_or_else(|| A.to_owned(), |v| (i32::from(v)).to_string()),
            self.s3.map_or_else(|| A.to_owned(), |v| (i32::from(v)).to_string()),
            self.intro
        )
    }
}

impl Display for ApiErrX {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        const A: &str = "**";
        write!(
            f,
            "[??{:0>2}{:0>2}**]: {}",
            self.s1.map_or_else(|| A.to_owned(), |v| (i32::from(v)).to_string()),
            self.s2.map_or_else(|| A.to_owned(), |v| (i32::from(v)).to_string()),
            self.intro
        )
    }
}