use axum::response::{IntoResponse, Response};
use reqwest::StatusCode;
use thiserror::Error;

/// Main error type for the Blahg application
///
/// All errors follow the format: error-blahg-<domain>-<number> <message>: <details>
/// Domains are organized alphabetically: config, consumer, http, process, storage
#[derive(Error, Debug)]
pub enum BlahgError {
    // Config domain - Configuration-related errors
    #[error("error-blahg-config-1 Failed to parse HTTP client timeout: {details}")]
    /// Failed to parse HTTP client timeout from environment variable.
    ConfigHttpTimeoutInvalid {
        /// Details about the parsing error.
        details: String,
    },

    #[error("error-blahg-config-2 Failed to parse HTTP port: {port}")]
    /// Failed to parse HTTP port from environment variable.
    ConfigHttpPortInvalid {
        /// The invalid port value.
        port: String,
    },

    #[error("error-blahg-config-3 Invalid S3 URL format: {details}")]
    /// Failed to parse S3 URL format from environment variable.
    ConfigS3UrlInvalid {
        /// Details about the S3 URL parsing error.
        details: String,
    },

    #[error("error-blahg-config-4 Required feature not enabled: {feature}")]
    /// Required feature is not enabled in the build.
    ConfigFeatureNotEnabled {
        /// The feature that is required but not enabled.
        feature: String,
    },

    // Consumer domain - Jetstream consumer errors
    /// Error when a DNS nameserver IP cannot be parsed.
    ///
    /// This error occurs when the DNS_NAMESERVERS environment variable contains
    /// an IP address that cannot be parsed as a valid IpAddr.
    #[error("error-blahg-config-5 Unable to parse nameserver IP '{0}': {1}")]
    NameserverParsingFailed(String, std::net::AddrParseError),

    // Consumer domain - Jetstream consumer errors
    #[error("error-blahg-consumer-1 Failed to send badge event to queue: {details}")]
    /// Failed to send badge event to the processing queue.
    ConsumerQueueSendFailed {
        /// Details about the send failure.
        details: String,
    },

    #[error("error-blahg-consumer-2 Jetstream disconnected: {details}")]
    /// Jetstream consumer disconnected.
    ConsumerDisconnected {
        /// Details about the disconnection.
        details: String,
    },

    #[error(
        "error-blahg-consumer-3 Jetstream disconnect rate exceeded: {disconnect_count} disconnects in {duration_mins} minutes"
    )]
    /// Jetstream consumer disconnect rate exceeded the allowable limit.
    ConsumerDisconnectRateExceeded {
        /// Number of disconnects in the time period.
        disconnect_count: usize,
        /// Duration in minutes for the disconnect rate calculation.
        duration_mins: u64,
    },

    // HTTP domain - HTTP server and template errors
    #[error("error-blahg-http-1 Template rendering failed: {template}")]
    /// Template rendering failed in HTTP response.
    HttpTemplateRenderFailed {
        /// The template that failed to render.
        template: String,
    },

    #[error("error-blahg-http-2 Internal server error")]
    /// Generic internal server error for HTTP responses.
    HttpInternalServerError,

    // Process domain - Badge processing errors
    #[error("error-blahg-process-1 Invalid AT-URI format: {uri}")]
    /// Invalid AT-URI format encountered during processing.
    ProcessInvalidAturi {
        /// The invalid URI string.
        uri: String,
    },

    #[error("error-blahg-process-2 Failed to resolve identity for {did}: {details}")]
    /// Identity resolution failed with detailed error information.
    ProcessIdentityResolutionFailed {
        /// The DID that could not be resolved.
        did: String,
        /// Detailed error information.
        details: String,
    },

    #[error("error-blahg-process-3 Failed to fetch badge record: {uri}")]
    /// Failed to fetch badge record from AT Protocol.
    ProcessBadgeFetchFailed {
        /// The badge URI that could not be fetched.
        uri: String,
    },

    #[error("error-blahg-process-4 Failed to fetch badge {uri}: {details}")]
    /// Badge record fetch failed with detailed error information.
    ProcessBadgeRecordFetchFailed {
        /// The badge URI that could not be fetched.
        uri: String,
        /// Detailed error information.
        details: String,
    },

    #[error("error-blahg-process-5 Failed to download badge image: {image_ref}")]
    /// Failed to download badge image.
    ProcessImageDownloadFailed {
        /// Reference to the image that failed to download.
        image_ref: String,
    },

    #[error("error-blahg-process-6 Failed to process badge event: {event_type}")]
    /// Failed to process a badge event from Jetstream.
    ProcessEventHandlingFailed {
        /// Type of event that failed to process.
        event_type: String,
    },

    #[error("error-blahg-process-7 Image file too large: {size} bytes exceeds 3MB limit")]
    /// Badge image file exceeds maximum allowed size.
    ProcessImageTooLarge {
        /// The actual size of the image in bytes.
        size: usize,
    },

    #[error("error-blahg-process-8 Failed to decode image: {details}")]
    /// Failed to decode badge image data.
    ProcessImageDecodeFailed {
        /// Details about the decode error.
        details: String,
    },

    #[error("error-blahg-process-9 Unsupported image format: {format}")]
    /// Badge image is in an unsupported format.
    ProcessUnsupportedImageFormat {
        /// The unsupported image format.
        format: String,
    },

    #[error(
        "error-blahg-process-10 Image dimensions too small: {width}x{height}, minimum is 512x512"
    )]
    /// Badge image dimensions are below minimum requirements.
    ProcessImageTooSmall {
        /// The actual width of the image.
        width: u32,
        /// The actual height of the image.
        height: u32,
    },

    #[error("error-blahg-process-11 Image width too small after resize: {width}, minimum is 512")]
    /// Badge image width is below minimum after resize.
    ProcessImageWidthTooSmall {
        /// The actual width after resize.
        width: u32,
    },

    #[error("error-blahg-process-12 No signatures field found in record")]
    /// Badge record is missing required signatures field.
    ProcessNoSignaturesField,

    #[error("error-blahg-process-13 Missing issuer field in signature")]
    /// Signature is missing required issuer field.
    ProcessMissingIssuerField,

    #[error("error-blahg-process-14 Missing signature field in signature")]
    /// Signature object is missing required signature field.
    ProcessMissingSignatureField,

    #[error("error-blahg-process-15 Record serialization failed: {details}")]
    /// Failed to serialize record for signature verification.
    ProcessRecordSerializationFailed {
        /// Details about the serialization error.
        details: String,
    },

    #[error("error-blahg-process-16 Signature decoding failed: {details}")]
    /// Failed to decode signature bytes.
    ProcessSignatureDecodingFailed {
        /// Details about the decoding error.
        details: String,
    },

    #[error(
        "error-blahg-process-17 Cryptographic validation failed for issuer {issuer}: {details}"
    )]
    /// Cryptographic signature validation failed.
    ProcessCryptographicValidationFailed {
        /// The issuer DID whose signature validation failed.
        issuer: String,
        /// Detailed error information.
        details: String,
    },

    // Storage domain - Database and storage errors
    #[error("error-blahg-storage-1 Database operation failed: {operation}")]
    /// Database operation failed.
    StorageDatabaseFailed {
        /// Description of the failed operation.
        operation: String,
    },

    #[error("error-blahg-storage-2 File storage operation failed: {operation}")]
    /// File storage operation failed.
    StorageFileOperationFailed {
        /// Description of the failed file operation.
        operation: String,
    },
}

/// Result type alias for convenience
pub type Result<T> = std::result::Result<T, BlahgError>;

impl From<sqlx::Error> for BlahgError {
    fn from(err: sqlx::Error) -> Self {
        BlahgError::StorageDatabaseFailed {
            operation: err.to_string(),
        }
    }
}

impl From<serde_json::Error> for BlahgError {
    fn from(err: serde_json::Error) -> Self {
        BlahgError::ProcessEventHandlingFailed {
            event_type: err.to_string(),
        }
    }
}

impl From<reqwest::Error> for BlahgError {
    fn from(err: reqwest::Error) -> Self {
        BlahgError::ProcessBadgeFetchFailed {
            uri: err.to_string(),
        }
    }
}

impl From<image::ImageError> for BlahgError {
    fn from(err: image::ImageError) -> Self {
        BlahgError::ProcessImageDownloadFailed {
            image_ref: err.to_string(),
        }
    }
}

impl From<minijinja::Error> for BlahgError {
    fn from(err: minijinja::Error) -> Self {
        BlahgError::HttpTemplateRenderFailed {
            template: err.to_string(),
        }
    }
}

impl From<std::io::Error> for BlahgError {
    fn from(err: std::io::Error) -> Self {
        BlahgError::ProcessImageDownloadFailed {
            image_ref: err.to_string(),
        }
    }
}

impl From<std::num::ParseIntError> for BlahgError {
    fn from(err: std::num::ParseIntError) -> Self {
        BlahgError::ConfigHttpPortInvalid {
            port: err.to_string(),
        }
    }
}

impl From<anyhow::Error> for BlahgError {
    fn from(err: anyhow::Error) -> Self {
        BlahgError::ProcessEventHandlingFailed {
            event_type: err.to_string(),
        }
    }
}

impl From<atproto_record::errors::AturiError> for BlahgError {
    fn from(err: atproto_record::errors::AturiError) -> Self {
        BlahgError::ProcessInvalidAturi {
            uri: err.to_string(),
        }
    }
}

impl IntoResponse for BlahgError {
    fn into_response(self) -> Response {
        tracing::error!(error = ?self, "internal server error");
        (StatusCode::INTERNAL_SERVER_ERROR).into_response()
    }
}