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use crate::{
    client::Client,
    request::{validate, NullableField, Request},
    response::ResponseFuture,
    routing::Route,
};
use serde::Serialize;
use std::{
    error::Error,
    fmt::{Display, Formatter, Result as FmtResult},
};
use twilight_model::user::User;

/// The error created when the user can not be updated as configured.
#[derive(Debug)]
pub struct UpdateCurrentUserError {
    kind: UpdateCurrentUserErrorType,
}

impl UpdateCurrentUserError {
    /// Immutable reference to the type of error that occurred.
    #[must_use = "retrieving the type has no effect if left unused"]
    pub const fn kind(&self) -> &UpdateCurrentUserErrorType {
        &self.kind
    }

    /// Consume the error, returning the source error if there is any.
    #[allow(clippy::unused_self)]
    #[must_use = "consuming the error and retrieving the source has no effect if left unused"]
    pub fn into_source(self) -> Option<Box<dyn Error + Send + Sync>> {
        None
    }

    /// Consume the error, returning the owned error type and the source error.
    #[must_use = "consuming the error into its parts has no effect if left unused"]
    pub fn into_parts(
        self,
    ) -> (
        UpdateCurrentUserErrorType,
        Option<Box<dyn Error + Send + Sync>>,
    ) {
        (self.kind, None)
    }
}

impl Display for UpdateCurrentUserError {
    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
        match &self.kind {
            UpdateCurrentUserErrorType::UsernameInvalid { .. } => {
                f.write_str("the username length is invalid")
            }
        }
    }
}

impl Error for UpdateCurrentUserError {}

/// Type of [`UpdateCurrentUserError`] that occurred.
#[derive(Debug)]
#[non_exhaustive]
pub enum UpdateCurrentUserErrorType {
    /// The length of the username is either fewer than 2 UTF-16 characters or more than 32 UTF-16
    /// characters.
    UsernameInvalid,
}

#[derive(Serialize)]
struct UpdateCurrentUserFields<'a> {
    #[serde(skip_serializing_if = "Option::is_none")]
    avatar: Option<NullableField<&'a str>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    username: Option<&'a str>,
}

/// Update the current user.
///
/// All parameters are optional. If the username is changed, it may cause the discriminator to be
/// rnadomized.
pub struct UpdateCurrentUser<'a> {
    fields: UpdateCurrentUserFields<'a>,
    http: &'a Client,
}

impl<'a> UpdateCurrentUser<'a> {
    pub(crate) const fn new(http: &'a Client) -> Self {
        Self {
            fields: UpdateCurrentUserFields {
                avatar: None,
                username: None,
            },
            http,
        }
    }

    /// Set the user's avatar.
    ///
    /// This must be a Data URI, in the form of `data:image/{type};base64,{data}` where `{type}` is
    /// the image MIME type and `{data}` is the base64-encoded image. Refer to [the discord docs]
    /// for more information.
    ///
    /// [the discord docs]: https://discord.com/developers/docs/reference#image-data
    pub const fn avatar(mut self, avatar: Option<&'a str>) -> Self {
        self.fields.avatar = Some(NullableField(avatar));

        self
    }

    /// Set the username.
    ///
    /// The minimum length is 1 UTF-16 character and the maximum is 32 UTF-16 characters.
    ///
    /// # Errors
    ///
    /// Returns an [`UpdateCurrentUserErrorType::UsernameInvalid`] error type if
    /// the username length is too short or too long.
    pub fn username(mut self, username: &'a str) -> Result<Self, UpdateCurrentUserError> {
        if !validate::username(&username) {
            return Err(UpdateCurrentUserError {
                kind: UpdateCurrentUserErrorType::UsernameInvalid,
            });
        }

        self.fields.username.replace(username);

        Ok(self)
    }

    /// Execute the request, returning a future resolving to a [`Response`].
    ///
    /// [`Response`]: crate::response::Response
    pub fn exec(self) -> ResponseFuture<User> {
        let mut request = Request::builder(&Route::UpdateCurrentUser);

        request = match request.json(&self.fields) {
            Ok(request) => request,
            Err(source) => return ResponseFuture::error(source),
        };

        self.http.request(request.build())
    }
}