use std::{error::Error, fmt};

use crate::HYPER3D_PROVIDER;

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Hyper3dStatusHint {
    BadRequest,
    ServiceUnavailable,
    BadGateway,
    GatewayTimeout,
}

#[derive(Clone, Debug)]
pub enum Hyper3dError {
    InvalidConfig {
        provider: &'static str,
        reason: Option<&'static str>,
        message: String,
    },
    InvalidRequest {
        provider: &'static str,
        field: Option<&'static str>,
        message: String,
        allowed: Option<Vec<String>>,
    },
    Request {
        provider: &'static str,
        message: String,
        endpoint: Option<String>,
        timeout: bool,
        connect: bool,
        request: bool,
        body: bool,
        status_code: Option<u16>,
        source: Option<String>,
    },
    Upstream {
        provider: &'static str,
        message: String,
        upstream_status: u16,
        raw_excerpt: String,
    },
    ResponseParse {
        provider: &'static str,
        message: String,
        raw_excerpt: String,
    },
    MissingField {
        provider: &'static str,
        message: String,
    },
}

impl Hyper3dError {
    pub fn provider(&self) -> &'static str {
        match self {
            Self::InvalidConfig { provider, .. }
            | Self::InvalidRequest { provider, .. }
            | Self::Request { provider, .. }
            | Self::Upstream { provider, .. }
            | Self::ResponseParse { provider, .. }
            | Self::MissingField { provider, .. } => provider,
        }
    }

    pub fn message(&self) -> &str {
        match self {
            Self::InvalidConfig { message, .. }
            | Self::InvalidRequest { message, .. }
            | Self::Request { message, .. }
            | Self::Upstream { message, .. }
            | Self::ResponseParse { message, .. }
            | Self::MissingField { message, .. } => message,
        }
    }

    pub fn status_hint(&self) -> Hyper3dStatusHint {
        match self {
            Self::InvalidConfig { .. } => Hyper3dStatusHint::ServiceUnavailable,
            Self::InvalidRequest { .. } => Hyper3dStatusHint::BadRequest,
            Self::Request { timeout, .. } if *timeout => Hyper3dStatusHint::GatewayTimeout,
            Self::Request { .. }
            | Self::Upstream { .. }
            | Self::ResponseParse { .. }
            | Self::MissingField { .. } => Hyper3dStatusHint::BadGateway,
        }
    }

    pub fn invalid_config(reason: &'static str, message: impl Into<String>) -> Self {
        Self::InvalidConfig {
            provider: HYPER3D_PROVIDER,
            reason: Some(reason),
            message: message.into(),
        }
    }

    pub(crate) fn invalid_request(field: Option<&'static str>, message: impl Into<String>) -> Self {
        Self::InvalidRequest {
            provider: HYPER3D_PROVIDER,
            field,
            message: message.into(),
            allowed: None,
        }
    }

    pub(crate) fn invalid_request_allowed(
        field: &'static str,
        message: impl Into<String>,
        allowed: &[&str],
    ) -> Self {
        Self::InvalidRequest {
            provider: HYPER3D_PROVIDER,
            field: Some(field),
            message: message.into(),
            allowed: Some(allowed.iter().map(|value| value.to_string()).collect()),
        }
    }

    pub(crate) fn request(
        message: impl Into<String>,
        endpoint: Option<String>,
        timeout: bool,
        connect: bool,
        request: bool,
        body: bool,
        status_code: Option<u16>,
        source: Option<String>,
    ) -> Self {
        Self::Request {
            provider: HYPER3D_PROVIDER,
            message: message.into(),
            endpoint,
            timeout,
            connect,
            request,
            body,
            status_code,
            source,
        }
    }

    pub(crate) fn upstream(
        message: impl Into<String>,
        upstream_status: u16,
        raw_excerpt: impl Into<String>,
    ) -> Self {
        Self::Upstream {
            provider: HYPER3D_PROVIDER,
            message: message.into(),
            upstream_status,
            raw_excerpt: raw_excerpt.into(),
        }
    }

    pub(crate) fn response_parse(
        message: impl Into<String>,
        raw_excerpt: impl Into<String>,
    ) -> Self {
        Self::ResponseParse {
            provider: HYPER3D_PROVIDER,
            message: message.into(),
            raw_excerpt: raw_excerpt.into(),
        }
    }

    pub(crate) fn missing_field(message: impl Into<String>) -> Self {
        Self::MissingField {
            provider: HYPER3D_PROVIDER,
            message: message.into(),
        }
    }
}

impl fmt::Display for Hyper3dError {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_str(self.message())
    }
}

impl Error for Hyper3dError {}