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use std::io::Cursor;

use glob::glob;
use image::io::Reader;
use image::DynamicImage;
use tracing::*;

use crate::file_cache::FileCache;

#[derive(Debug)]
struct ImageSequenceEntry {
	filename: String,
	version:  u32,
	image:    DynamicImage,
}

impl ImageSequenceEntry {
	pub fn filename(&self) -> &str {
		&self.filename
	}

	pub fn image(&self) -> &DynamicImage {
		&self.image
	}

	pub fn version(&self) -> u32 {
		self.version
	}

	pub fn without_image(filename: &str, version: u32) -> Self {
		Self {
			filename: filename.to_string(),
			version,
			image: image::DynamicImage::ImageRgb8(image::RgbImage::new(0, 0)),
		}
	}

	pub fn from_data(filename: &str, version: u32, data: &Vec<u8>) -> anyhow::Result<Self> {
		let reader = Reader::new(Cursor::new(data))
			.with_guessed_format()
			.unwrap();

		match reader.decode() {
			Ok(image) => Ok(Self {
				filename: filename.to_string(),
				version,
				image,
			}),
			Err(e) => {
				eprintln!("Couldn't load image {} {:?}", &filename, &e);
				anyhow::bail!("Couldn't load image {} {:?}", &filename, e);
			},
		}
	}
}

#[derive(Debug)]
pub struct ImageSequence {
	filename: String,
	entries:  Vec<ImageSequenceEntry>,
}

impl ImageSequence {
	pub fn new() -> Self {
		Self {
			filename: String::new(),
			entries:  Vec::new(),
		}
	}

	pub fn len(&self) -> usize {
		self.entries.len()
	}

	pub fn set_filename(&mut self, filename: &str) {
		self.filename = filename.to_string();
	}
	pub fn load(
		&mut self,
		file_cache: &mut std::sync::Arc<std::sync::Mutex<FileCache>>,
	) -> anyhow::Result<()> {
		if self.entries.len() == 0 {
			// :HACK: to allow multiple calls for now
			if self.filename != "" {
				self.entries = Vec::new();

				let fileglob = self.filename.clone();

				for entry in glob(&fileglob).expect("Failed to read glob pattern") {
					let mut fc = file_cache.lock().unwrap();
					match entry {
						Ok(path) => {
							self.add_image(&mut fc, &path.to_string_lossy())?;
						},
						Err(e) => debug!("Error globbing {:?}", e),
					}
				}
			}
		} else {
			// :TODO: maybe don't do this on the main thread
			for entry in self.entries.iter_mut() {
				let mut fc = file_cache.lock().unwrap();
				ImageSequence::update_entry(&mut fc, entry)?;
			}
		}
		Ok(())
	}

	pub fn get(&self, index: usize) -> Option<&DynamicImage> {
		self.entries.get(index).map(|e| e.image())
	}

	fn update_entry(
		file_cache: &mut FileCache,
		entry: &mut ImageSequenceEntry,
	) -> anyhow::Result<()> {
		let filename = entry.filename();
		let old_version = entry.version();
		//		println!( "Trying to update image {:?}", &filename );

		let (version, data) = file_cache.load(&filename).unwrap();

		if old_version != version {
			//			eprintln!("Updating image from data version {}", version );
			let entry_new = ImageSequenceEntry::from_data(&filename, version, &data)?;

			*entry = entry_new;
		}

		Ok(())
	}

	fn add_image(&mut self, file_cache: &mut FileCache, filename: &str) -> anyhow::Result<()> {
		//		println!( "Trying to load image {:?}", &filename );
		let (version, data) = file_cache.load(filename).unwrap();

		if data.len() > 0 {
			// only true if cache blocks on initial load, or somebody else already requested the same file earlier
			let entry = ImageSequenceEntry::from_data(&filename, version, &data)?;
			self.entries.push(entry);
		} else {
			let entry = ImageSequenceEntry::without_image(&filename, version);
			self.entries.push(entry);
		}

		Ok(())
	}
}