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

use crate::VECTOR_ENGINE_PROVIDER;

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

#[derive(Clone, Debug)]
pub enum AudioError {
    InvalidConfig {
        provider: &'static str,
        message: String,
    },
    InvalidRequest {
        provider: &'static str,
        message: 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,
    },
    MissingAudio {
        provider: &'static str,
        message: String,
        reason_code: Option<&'static str>,
    },
}

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

    /// 可安全写入任务记录和指标的稳定失败分类；不会携带 provider 正文或凭据。
    pub fn reason_code(&self) -> Option<&'static str> {
        match self {
            Self::MissingAudio { reason_code, .. } => *reason_code,
            _ => None,
        }
    }

    pub fn status_hint(&self) -> AudioStatusHint {
        match self {
            Self::InvalidConfig { .. } => AudioStatusHint::ServiceUnavailable,
            Self::InvalidRequest { .. } => AudioStatusHint::BadRequest,
            Self::Request {
                timeout,
                status_code,
                ..
            } if *timeout => AudioStatusHint::GatewayTimeout,
            Self::Request { status_code, .. }
                if status_code.is_some_and(|status| status >= 500) =>
            {
                AudioStatusHint::BadGateway
            }
            Self::Upstream { .. } | Self::ResponseParse { .. } | Self::MissingAudio { .. } => {
                AudioStatusHint::BadGateway
            }
            Self::Request { .. } => AudioStatusHint::BadGateway,
        }
    }

    pub fn invalid_config(message: impl Into<String>) -> Self {
        Self::invalid_config_for(VECTOR_ENGINE_PROVIDER, message)
    }

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

    pub fn invalid_request(message: impl Into<String>) -> Self {
        Self::invalid_request_for(VECTOR_ENGINE_PROVIDER, message)
    }

    pub fn invalid_request_for(provider: &'static str, message: impl Into<String>) -> Self {
        Self::InvalidRequest {
            provider,
            message: message.into(),
        }
    }

    pub 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_for(
            VECTOR_ENGINE_PROVIDER,
            message,
            endpoint,
            timeout,
            connect,
            request,
            body,
            status_code,
            source,
        )
    }

    #[allow(clippy::too_many_arguments)]
    pub fn request_for(
        provider: &'static str,
        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,
            message: message.into(),
            endpoint,
            timeout,
            connect,
            request,
            body,
            status_code,
            source,
        }
    }

    pub fn upstream(
        message: impl Into<String>,
        upstream_status: u16,
        raw_excerpt: impl Into<String>,
    ) -> Self {
        Self::upstream_for(
            VECTOR_ENGINE_PROVIDER,
            message,
            upstream_status,
            raw_excerpt,
        )
    }

    pub fn upstream_for(
        provider: &'static str,
        message: impl Into<String>,
        upstream_status: u16,
        raw_excerpt: impl Into<String>,
    ) -> Self {
        Self::Upstream {
            provider,
            message: message.into(),
            upstream_status,
            raw_excerpt: raw_excerpt.into(),
        }
    }

    pub fn response_parse(message: impl Into<String>, raw_excerpt: impl Into<String>) -> Self {
        Self::response_parse_for(VECTOR_ENGINE_PROVIDER, message, raw_excerpt)
    }

    pub fn response_parse_for(
        provider: &'static str,
        message: impl Into<String>,
        raw_excerpt: impl Into<String>,
    ) -> Self {
        Self::ResponseParse {
            provider,
            message: message.into(),
            raw_excerpt: raw_excerpt.into(),
        }
    }

    pub fn missing_audio(message: impl Into<String>) -> Self {
        Self::missing_audio_for(VECTOR_ENGINE_PROVIDER, message)
    }

    pub fn missing_audio_for(provider: &'static str, message: impl Into<String>) -> Self {
        Self::MissingAudio {
            provider,
            message: message.into(),
            reason_code: None,
        }
    }

    pub fn missing_audio_with_reason_for(
        provider: &'static str,
        reason_code: &'static str,
        message: impl Into<String>,
    ) -> Self {
        Self::MissingAudio {
            provider,
            message: message.into(),
            reason_code: Some(reason_code),
        }
    }
}

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

impl Error for AudioError {}