//! Slide metadata types for SlideScope demo

use serde::{Deserialize, Serialize};

/// Slide metadata containing all information about a pathology slide
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SlideMetadata {
    /// Unique slide identifier
    pub id: String,
    /// Display name of the slide
    pub name: String,
    /// Original file path
    pub path: String,
    /// Image width in pixels
    pub width: u32,
    /// Image height in pixels
    pub height: u32,
    /// Current processing status
    pub status: SlideStatus,
    /// Detected or configured stain type
    pub stain_type: Option<StainType>,
    /// Path to generated thumbnail
    pub thumbnail_path: Option<String>,
    /// Path to pre-generated tile pyramid
    pub pyramid_path: Option<String>,
    /// Unix timestamp when slide was imported
    pub created_at: i64,
    /// Unix timestamp when processing completed
    pub processed_at: Option<i64>,
}

/// Processing status of a slide
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
#[derive(Default)]
pub enum SlideStatus {
    /// Slide imported and pyramid generated, ready for processing
    #[default]
    Imported,
    /// NMF processing in progress
    Processing,
    /// Processing completed successfully
    Processed,
    /// Processing failed
    Failed,
}

impl std::fmt::Display for SlideStatus {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Imported => write!(f, "imported"),
            Self::Processing => write!(f, "processing"),
            Self::Processed => write!(f, "processed"),
            Self::Failed => write!(f, "failed"),
        }
    }
}

/// Stain type for pathology slides
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
pub enum StainType {
    /// Hematoxylin and Eosin (most common)
    #[serde(rename = "H&E")]
    #[default]
    HE,
    /// Immunohistochemistry with DAB chromogen
    #[serde(rename = "IHC-DAB")]
    IhcDab,
    /// Custom or unknown stain configuration
    Custom,
}

impl std::fmt::Display for StainType {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::HE => write!(f, "H&E"),
            Self::IhcDab => write!(f, "IHC-DAB"),
            Self::Custom => write!(f, "Custom"),
        }
    }
}

/// Supported image formats for import
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum ImageFormat {
    /// Standard TIFF
    Tiff,
    /// BigTIFF for large images
    BigTiff,
    /// Aperio SVS format
    Svs,
    /// Hamamatsu NDPI format
    Ndpi,
    /// PNG format
    Png,
    /// JPEG format
    Jpeg,
}

impl ImageFormat {
    /// Detect format from file extension
    pub fn from_extension(ext: &str) -> Option<Self> {
        match ext.to_lowercase().as_str() {
            "tif" | "tiff" => Some(Self::Tiff),
            "svs" => Some(Self::Svs),
            "ndpi" => Some(Self::Ndpi),
            "png" => Some(Self::Png),
            "jpg" | "jpeg" => Some(Self::Jpeg),
            _ => None,
        }
    }

    /// Check if format requires OpenSlide
    pub fn requires_openslide(&self) -> bool {
        matches!(self, Self::Svs | Self::Ndpi)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_slide_status_serialization() {
        let status = SlideStatus::Processing;
        let json = serde_json::to_string(&status).unwrap();
        assert_eq!(json, "\"processing\"");

        let deserialized: SlideStatus = serde_json::from_str(&json).unwrap();
        assert_eq!(deserialized, SlideStatus::Processing);
    }

    #[test]
    fn test_stain_type_serialization() {
        let stain = StainType::HE;
        let json = serde_json::to_string(&stain).unwrap();
        assert_eq!(json, "\"H&E\"");
    }

    #[test]
    fn test_image_format_detection() {
        assert_eq!(ImageFormat::from_extension("tif"), Some(ImageFormat::Tiff));
        assert_eq!(ImageFormat::from_extension("SVS"), Some(ImageFormat::Svs));
        assert_eq!(ImageFormat::from_extension("unknown"), None);
    }
}