// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

use std::path::Path;
use std::path::PathBuf;

use anki_io::metadata;
use anki_io::read_file;
use anki_proto::image_occlusion::get_image_occlusion_note_response::ImageClozeNote;
use anki_proto::image_occlusion::get_image_occlusion_note_response::Value;
use anki_proto::image_occlusion::GetImageForOcclusionResponse;
use anki_proto::image_occlusion::GetImageOcclusionNoteResponse;
use regex::Regex;

use crate::media::MediaManager;
use crate::notetype::CardGenContext;
use crate::prelude::*;

impl Collection {
    pub fn get_image_for_occlusion(&mut self, path: &str) -> Result<GetImageForOcclusionResponse> {
        let mut metadata = GetImageForOcclusionResponse {
            ..Default::default()
        };
        metadata.data = read_file(path)?;
        Ok(metadata)
    }

    #[allow(clippy::too_many_arguments)]
    pub fn add_image_occlusion_note(
        &mut self,
        notetype_id: NotetypeId,
        image_path: &str,
        occlusions: &str,
        header: &str,
        back_extra: &str,
        tags: Vec<String>,
    ) -> Result<OpOutput<()>> {
        // image file
        let image_bytes = read_file(image_path)?;
        let image_filename = Path::new(&image_path)
            .file_name()
            .or_not_found("expected filename")?
            .to_str()
            .unwrap()
            .to_string();

        let mgr = MediaManager::new(&self.media_folder, &self.media_db)?;
        let actual_image_name_after_adding = mgr.add_file(&image_filename, &image_bytes)?;

        let image_tag = format!(r#"<img src="{}">"#, &actual_image_name_after_adding);

        let current_deck = self.get_current_deck()?;
        self.transact(Op::ImageOcclusion, |col| {
            let nt = if notetype_id.0 == 0 {
                // when testing via .html page, use first available notetype
                col.add_image_occlusion_notetype_inner()?;
                col.get_first_io_notetype()?
                    .or_invalid("expected an i/o notetype to exist")?
            } else {
                col.get_io_notetype_by_id(notetype_id)?
            };

            let mut note = nt.new_note();
            note.set_field(0, occlusions)?;
            note.set_field(1, &image_tag)?;
            note.set_field(2, header)?;
            note.set_field(3, back_extra)?;
            note.tags = tags;

            let last_deck = col.get_last_deck_added_to_for_notetype(note.notetype_id);
            let ctx = CardGenContext::new(nt.as_ref(), last_deck, col.usn()?);
            let norm = col.get_config_bool(BoolKey::NormalizeNoteText);
            col.add_note_inner(&ctx, &mut note, current_deck.id, norm)?;

            Ok(())
        })
    }

    pub fn get_image_occlusion_note(
        &mut self,
        note_id: NoteId,
    ) -> Result<GetImageOcclusionNoteResponse> {
        let value = match self.get_image_occlusion_note_inner(note_id) {
            Ok(note) => Value::Note(note),
            Err(err) => Value::Error(format!("{:?}", err)),
        };
        Ok(GetImageOcclusionNoteResponse { value: Some(value) })
    }

    pub fn get_image_occlusion_note_inner(&mut self, note_id: NoteId) -> Result<ImageClozeNote> {
        let note = self.storage.get_note(note_id)?.or_not_found(note_id)?;
        let mut cloze_note = ImageClozeNote::default();

        let fields = note.fields();
        if fields.len() < 4 {
            invalid_input!("Note does not have 4 fields");
        }

        cloze_note.occlusions = fields[0].clone();
        cloze_note.header = fields[2].clone();
        cloze_note.back_extra = fields[3].clone();
        cloze_note.image_data = "".into();
        cloze_note.tags = note.tags.clone();

        let image_file_name = &fields[1];
        let src = self
            .extract_img_src(image_file_name)
            .unwrap_or_else(|| "".to_owned());
        let final_path = self.media_folder.join(src);

        if self.is_image_file(&final_path)? {
            cloze_note.image_data = read_file(&final_path)?;
        }

        Ok(cloze_note)
    }

    pub fn update_image_occlusion_note(
        &mut self,
        note_id: NoteId,
        occlusions: &str,
        header: &str,
        back_extra: &str,
        tags: Vec<String>,
    ) -> Result<OpOutput<()>> {
        let mut note = self.storage.get_note(note_id)?.or_not_found(note_id)?;
        self.transact(Op::ImageOcclusion, |col| {
            note.set_field(0, occlusions)?;
            note.set_field(2, header)?;
            note.set_field(3, back_extra)?;
            note.tags = tags;
            col.update_note_inner(&mut note)?;
            Ok(())
        })
    }

    fn extract_img_src(&mut self, html: &str) -> Option<String> {
        let re = Regex::new(r#"<img\s+[^>]*src\s*=\s*"([^"]+)"#).unwrap();
        re.captures(html).map(|cap| cap[1].to_owned())
    }

    fn is_image_file(&mut self, path: &PathBuf) -> Result<bool> {
        let file_path = Path::new(&path);
        let supported_extensions = vec![
            "jpg", "jpeg", "png", "tif", "tiff", "gif", "svg", "webp", "ico",
        ];

        if file_path.exists() {
            let meta = metadata(file_path)?;
            if meta.is_file() {
                if let Some(ext_osstr) = file_path.extension() {
                    if let Some(ext_str) = ext_osstr.to_str() {
                        if supported_extensions.contains(&ext_str) {
                            return Ok(true);
                        }
                    }
                }
            }
        }

        Ok(false)
    }
}