//! Mail attachment metadata and an independent dialog session. Files and Mail
//! share bounded decoders/PDF workers; opening Mail never changes Files state.
use crate::document_preview::{Preview, image_thumbnail, preview};
use crate::{
    AppWindow, EmailReader, InboxState, ListAttachment, MailAttachment, MailAttachments,
    mail::MailMessage,
};
use slint::{ComponentHandle, Model, ModelRc, Rgba8Pixel, SharedPixelBuffer, VecModel};
use std::{
    cell::RefCell,
    collections::HashSet,
    rc::Rc,
    sync::{
        Arc,
        atomic::{AtomicU64, Ordering},
    },
};

#[cfg(mobile)]
static SUSPEND: std::sync::OnceLock<Box<dyn Fn() + Send + Sync>> = std::sync::OnceLock::new();
#[cfg(mobile)]
pub(crate) fn suspend() {
    if let Some(suspend) = SUSPEND.get() {
        suspend();
    }
}

pub(crate) fn clear(app: &AppWindow) {
    let ui = app.global::<MailAttachments>();
    ui.invoke_command("close".into(), "".into());
    ui.set_rows(ModelRc::default());
}
pub(crate) fn project(app: &AppWindow, email: &MailMessage, same: bool) {
    let previous = same.then(|| {
        let rows = app.global::<MailAttachments>().get_rows();
        (0..rows.row_count())
            .filter_map(|index| rows.row_data(index))
            .filter(|row| row.has_thumbnail)
            .map(|row| (row.id, row.thumbnail))
            .collect::<std::collections::HashMap<_, _>>()
    });
    if !same {
        clear(app);
    }
    let mut rows = attachment_rows(&email.attachments);
    if let Some(previous) = previous {
        for row in &mut rows {
            if let Some(thumbnail) = previous.get(row.id.as_str()) {
                row.thumbnail = thumbnail.clone();
                row.has_thumbnail = true;
            }
        }
    }
    let thumbnail_ids = thumbnail_ids(&email.attachments, &rows);
    app.global::<MailAttachments>()
        .set_rows(ModelRc::new(VecModel::from(rows)));
    for id in thumbnail_ids {
        app.global::<MailAttachments>()
            .invoke_command("thumbnail".into(), id);
    }
}

fn visible_attachment(attachment: &flectar_mail_core::models::AttachmentMeta) -> bool {
    !attachment.is_inline
        || attachment
            .filename
            .as_ref()
            .is_some_and(|name| !name.trim().is_empty())
}

// attachment_rows preserves this filtered metadata order. Walk the two in
// lockstep instead of formatting an ID for every row in a nested search.
fn thumbnail_ids(
    attachments: &[flectar_mail_core::models::AttachmentMeta],
    rows: &[MailAttachment],
) -> Vec<slint::SharedString> {
    attachments
        .iter()
        .filter(|attachment| visible_attachment(attachment))
        .zip(rows)
        .filter(|(attachment, row)| thumbnail_candidate(attachment) && !row.has_thumbnail)
        .take(4)
        .map(|(_, row)| row.id.clone())
        .collect()
}

fn thumbnail_candidate(attachment: &flectar_mail_core::models::AttachmentMeta) -> bool {
    let media = attachment
        .mime_type
        .as_deref()
        .unwrap_or("")
        .split(';')
        .next()
        .unwrap_or("")
        .trim();
    attachment.size.is_none_or(|size| size <= 4 * 1024 * 1024)
        && media
            .get(..6)
            .is_some_and(|prefix| prefix.eq_ignore_ascii_case("image/"))
        && !media.eq_ignore_ascii_case("image/svg+xml")
}

async fn read_preview_bytes(file: tokio::fs::File, max_bytes: usize) -> Result<Vec<u8>, String> {
    use tokio::io::AsyncReadExt;
    let mut reader = file.take(max_bytes as u64);
    let mut bytes = Vec::new();
    let mut chunk = [0_u8; 8 * 1024];
    loop {
        let count = reader
            .read(&mut chunk)
            .await
            .map_err(|error| error.to_string())?;
        if count == 0 {
            return Ok(bytes);
        }
        let required = bytes.len() + count;
        if required > bytes.capacity() {
            let target = required
                .max(bytes.capacity().saturating_mul(2))
                .min(max_bytes);
            bytes.reserve_exact(target - bytes.len());
        }
        bytes.extend_from_slice(&chunk[..count]);
    }
}
fn attachment_rows(
    attachments: &[flectar_mail_core::models::AttachmentMeta],
) -> Vec<MailAttachment> {
    attachments
        .iter()
        .filter(|a| visible_attachment(a))
        .map(|a| {
            let name = file_name(a);
            let media = media_type(a);
            MailAttachment {
                id: a.id.to_string().into(),
                name: name.into(),
                previewable: previewable(name, &media),
                kind: file_kind(name, &media).into(),
                detail: media.into(),
                thumbnail: Default::default(),
                has_thumbnail: false,
            }
        })
        .collect::<Vec<_>>()
}

/// A message-list row's file chip.
pub(crate) fn list_attachment(
    attachment: &flectar_mail_core::models::AttachmentMeta,
) -> ListAttachment {
    let name = file_name(attachment);
    let media = media_type(attachment);
    let (stem, extension) = split_extension(name);
    ListAttachment {
        id: attachment.id.to_string().into(),
        stem: stem.into(),
        extension: extension.into(),
        kind: file_kind(name, &media).into(),
        previewable: previewable(name, &media),
    }
}

fn file_name(attachment: &flectar_mail_core::models::AttachmentMeta) -> &str {
    attachment
        .filename
        .as_deref()
        .filter(|s| !s.is_empty())
        .unwrap_or("attachment")
}

fn media_type(attachment: &flectar_mail_core::models::AttachmentMeta) -> String {
    attachment
        .mime_type
        .as_deref()
        .unwrap_or("")
        .split(';')
        .next()
        .unwrap_or("")
        .trim()
        .to_ascii_lowercase()
}

fn previewable(name: &str, media: &str) -> bool {
    media == "application/pdf"
        || media.starts_with("image/")
        || media.starts_with("text/")
        || matches!(media, "application/json" | "application/xml")
        || name
            .as_bytes()
            .get(name.len().saturating_sub(4)..)
            .is_some_and(|suffix| suffix.eq_ignore_ascii_case(b".pdf"))
}

/// A name and its extension, such as "Report" and ".pdf". Only a short
/// final suffix counts, so "version 1.2 final" has none.
fn split_extension(name: &str) -> (&str, &str) {
    match name.rfind('.') {
        Some(dot)
            if dot > 0
                && (2..=6).contains(&(name.len() - dot))
                && name[dot + 1..].chars().all(|c| c.is_ascii_alphanumeric()) =>
        {
            name.split_at(dot)
        }
        _ => (name, ""),
    }
}

/// What a file is, by its type and otherwise its name: pdf, document,
/// spreadsheet, presentation, image, video, audio, archive, code, calendar
/// or file. It picks the file's icon.
fn file_kind(name: &str, media: &str) -> &'static str {
    let extension = split_extension(name)
        .1
        .trim_start_matches('.')
        .to_ascii_lowercase();
    let is = |types: &[&str], extensions: &[&str], families: &[&str]| {
        types.contains(&media)
            || families.iter().any(|family| media.starts_with(family))
            || extensions.contains(&extension.as_str())
    };
    if is(&["application/pdf"], &["pdf"], &[]) {
        "pdf"
    } else if is(
        &[],
        &[
            "png", "jpg", "jpeg", "gif", "webp", "heic", "heif", "bmp", "tif", "tiff", "svg",
            "avif",
        ],
        &["image/"],
    ) {
        "image"
    } else if is(
        &[],
        &[
            "mp4", "mov", "m4v", "avi", "mkv", "webm", "wmv", "mpg", "mpeg", "3gp",
        ],
        &["video/"],
    ) {
        "video"
    } else if is(
        &[],
        &[
            "mp3", "wav", "m4a", "aac", "flac", "ogg", "oga", "opus", "wma", "aif", "aiff", "amr",
        ],
        &["audio/"],
    ) {
        "audio"
    } else if is(
        &["text/calendar", "application/ics"],
        &["ics", "ical", "vcs"],
        &[],
    ) {
        "calendar"
    } else if is(
        &[
            "text/csv",
            "text/tab-separated-values",
            "application/vnd.ms-excel",
            "application/vnd.oasis.opendocument.spreadsheet",
            "application/vnd.apple.numbers",
        ],
        &[
            "xls", "xlsx", "xlsm", "xlsb", "ods", "csv", "tsv", "numbers",
        ],
        &["application/vnd.openxmlformats-officedocument.spreadsheetml"],
    ) {
        "spreadsheet"
    } else if is(
        &[
            "application/vnd.ms-powerpoint",
            "application/vnd.oasis.opendocument.presentation",
            "application/vnd.apple.keynote",
        ],
        &["ppt", "pptx", "pps", "ppsx", "odp", "key"],
        &["application/vnd.openxmlformats-officedocument.presentationml"],
    ) {
        "presentation"
    } else if is(
        &[
            "application/msword",
            "application/rtf",
            "text/rtf",
            "text/plain",
            "text/markdown",
            "application/vnd.oasis.opendocument.text",
            "application/vnd.apple.pages",
            "application/epub+zip",
        ],
        &["doc", "docx", "odt", "rtf", "txt", "md", "pages", "epub"],
        &["application/vnd.openxmlformats-officedocument.wordprocessingml"],
    ) {
        "document"
    } else if is(
        &[
            "application/zip",
            "application/x-zip-compressed",
            "application/vnd.rar",
            "application/x-rar-compressed",
            "application/x-7z-compressed",
            "application/x-tar",
            "application/gzip",
            "application/x-gzip",
            "application/x-bzip2",
            "application/x-xz",
            "application/zstd",
        ],
        &["zip", "rar", "7z", "tar", "gz", "tgz", "bz2", "xz", "zst"],
        &[],
    ) {
        "archive"
    } else if is(
        &[
            "application/json",
            "application/xml",
            "text/xml",
            "text/html",
            "text/css",
            "text/javascript",
            "application/javascript",
            "application/x-sh",
        ],
        &[
            "json", "xml", "html", "htm", "css", "js", "ts", "py", "rs", "go", "java", "c", "cpp",
            "h", "sh", "yml", "yaml", "toml", "sql",
        ],
        &[],
    ) {
        "code"
    } else {
        "file"
    }
}

struct Session {
    task: Option<tokio::task::AbortHandle>,
    document: Option<Arc<Vec<u8>>>,
    selected: Option<flectar_mail_core::models::AttachmentMeta>,
}
impl Session {
    fn stop(&mut self) {
        if let Some(task) = self.task.take() {
            task.abort();
        }
        self.document = None;
        self.selected = None;
    }
}
impl Drop for Session {
    fn drop(&mut self) {
        self.stop();
    }
}

fn close(ui: &MailAttachments<'_>, generation: &AtomicU64, session: &RefCell<Session>) {
    generation.fetch_add(1, Ordering::SeqCst);
    session.borrow_mut().stop();
    ui.set_open(false);
    ui.set_busy(false);
    ui.set_image(Default::default());
    ui.set_text("".into());
    ui.set_status("".into());
    ui.set_pages(0);
    ui.set_is_image(false);
}

pub(crate) fn register(
    app: &AppWindow,
    inbox: &Rc<RefCell<InboxState>>,
    runtime: &tokio::runtime::Handle,
    documents: Arc<dyn crate::documents::DocumentProvider>,
) {
    let session = Rc::new(RefCell::new(Session {
        task: None,
        document: None,
        selected: None,
    }));
    let generation = Arc::new(AtomicU64::new(0));
    let weak = app.as_weak();
    #[cfg(mobile)]
    {
        let weak = weak.clone();
        let _ = SUSPEND.set(Box::new(move || {
            let _ = weak.upgrade_in_event_loop(|app| {
                app.global::<MailAttachments>()
                    .invoke_command("close".into(), "".into())
            });
        }));
    }
    // Profile IDs are not globally unique: compare Core identity as well as
    // message identity before allowing an old session to remain actionable.
    let context = Rc::new(RefCell::new(None::<(Arc<flectar_mail_core::Core>, i32)>));
    let timer = slint::Timer::default();
    let state = inbox.clone();
    let observed = context.clone();
    let window = weak.clone();
    timer.start(
        slint::TimerMode::Repeated,
        std::time::Duration::from_millis(100),
        move || {
            let Some(app) = window.upgrade() else {
                return;
            };
            let current = state.borrow().core.as_ref().map(|core| {
                (
                    core.file_core(),
                    app.global::<EmailReader>().get_message_id(),
                )
            });
            let changed = match (&*observed.borrow(), &current) {
                (Some((a, id)), Some((b, next))) => !Arc::ptr_eq(a, b) || id != next,
                (None, None) => false,
                _ => true,
            };
            if changed {
                app.global::<MailAttachments>()
                    .invoke_command("close".into(), "".into());
                *observed.borrow_mut() = current;
            }
        },
    );
    let (sender, mut receiver) = tokio::sync::mpsc::channel::<(
        u64,
        i32,
        Arc<flectar_mail_core::Core>,
        Result<Option<Preview>, String>,
    )>(2);
    let (thumbnail_sender, mut thumbnail_receiver) = tokio::sync::mpsc::channel::<(
        i32,
        i64,
        Arc<flectar_mail_core::Core>,
        Result<(Vec<u8>, u32, u32), String>,
    )>(8);
    let (thumbnail_job_sender, mut thumbnail_job_receiver) = tokio::sync::mpsc::channel::<(
        i32,
        flectar_mail_core::models::AttachmentMeta,
        Arc<flectar_mail_core::Core>,
    )>(8);
    let thumbnail_window = weak.clone();
    runtime.spawn(async move {
        while let Some((message, attachment, core)) = thumbnail_job_receiver.recv().await {
            let attachment_id = attachment.id;
            let result = async {
                let path = core
                    .get_attachment(attachment_id)
                    .await
                    .map_err(|error| error.to_string())?;
                let file = tokio::fs::File::open(path)
                    .await
                    .map_err(|error| error.to_string())?;
                let bytes = read_preview_bytes(file, 4 * 1024 * 1024 + 1).await?;
                image_thumbnail(bytes).await
            }
            .await;
            if thumbnail_sender
                .send((message, attachment_id, core, result))
                .await
                .is_err()
            {
                break;
            }
            let _ = thumbnail_window
                .upgrade_in_event_loop(|app| app.global::<MailAttachments>().invoke_deliver());
        }
    });
    let thumbnail_pending = Rc::new(RefCell::new(HashSet::<(usize, i32, i64)>::new()));
    let state = inbox.clone();
    let session_for_delivery = session.clone();
    let current = generation.clone();
    let pending_for_delivery = thumbnail_pending.clone();
    let window = weak.clone();
    app.global::<MailAttachments>().on_deliver(move || {
        let Some(app) = window.upgrade() else {
            return;
        };
        let session = &session_for_delivery;
        while let Ok((revision, message, core, result)) = receiver.try_recv() {
            if current.load(Ordering::SeqCst) != revision
                || app.global::<EmailReader>().get_message_id() != message
            {
                continue;
            }

            if !state
                .borrow()
                .core
                .as_ref()
                .is_some_and(|c| Arc::ptr_eq(&core, &c.file_core()))
            {
                continue;
            }

            let ui = app.global::<MailAttachments>();
            ui.set_busy(false);
            match result {
                Ok(Some(Preview::Pdf(data, page))) => {
                    session.borrow_mut().document = Some(data);
                    ui.set_page(page.index as i32);
                    ui.set_pages(page.count as i32);
                    ui.set_image(slint::Image::from_rgba8(
                        SharedPixelBuffer::<Rgba8Pixel>::clone_from_slice(
                            &page.pixels,
                            page.width,
                            page.height,
                        ),
                    ));
                    ui.set_is_image(true);
                }
                Ok(Some(Preview::Image(data, w, h))) => {
                    ui.set_image(slint::Image::from_rgba8(
                        SharedPixelBuffer::<Rgba8Pixel>::clone_from_slice(&data, w, h),
                    ));
                    ui.set_is_image(true);
                }
                Ok(Some(Preview::Text(text))) => ui.set_text(text.into()),
                Ok(None) => close(&ui, &current, session),
                Err(error) => ui.set_status(error.into()),
            }
        }
        while let Ok((message, attachment_id, core, result)) = thumbnail_receiver.try_recv() {
            let core_id = Arc::as_ptr(&core) as usize;
            pending_for_delivery
                .borrow_mut()
                .remove(&(core_id, message, attachment_id));
            if app.global::<EmailReader>().get_message_id() != message
                || !state
                    .borrow()
                    .core
                    .as_ref()
                    .is_some_and(|candidate| Arc::ptr_eq(&core, &candidate.file_core()))
            {
                continue;
            }
            let Ok((pixels, width, height)) = result else {
                continue;
            };
            let rows = app.global::<MailAttachments>().get_rows();
            let attachment_id = attachment_id.to_string();
            for index in 0..rows.row_count() {
                let Some(mut row) = rows.row_data(index) else {
                    continue;
                };
                if row.id.as_str() != attachment_id {
                    continue;
                }
                row.thumbnail = slint::Image::from_rgba8(
                    SharedPixelBuffer::<Rgba8Pixel>::clone_from_slice(&pixels, width, height),
                );
                row.has_thumbnail = true;
                rows.set_row_data(index, row);
                break;
            }
        }
    });
    let state = inbox.clone();
    let handle = runtime.clone();
    let pending_thumbnails = thumbnail_pending.clone();
    app.global::<MailAttachments>()
        .on_command(move |action, value| {
            let _keep_timer = &timer;
            let Some(app) = weak.upgrade() else {
                return;
            };
            let ui = app.global::<MailAttachments>();
            if action == "close" {
                close(&ui, &generation, &session);
                return;
            }
            let Some(core) = state.borrow().core.as_ref().map(|core| core.file_core()) else {
                return;
            };
            let message = app.global::<EmailReader>().get_message_id();
            // A profile switch may happen before the lifecycle timer's next
            // tick. Never use a retained attachment ID with a different Core.
            if (action == "page" || action == "download-current")
                && !context
                    .borrow()
                    .as_ref()
                    .is_some_and(|(owner, id)| Arc::ptr_eq(owner, &core) && *id == message)
            {
                close(&ui, &generation, &session);
                return;
            }
            // A message-list chip offers the first file of a conversation
            // that may not be open, so its file comes from the list rows.
            let listed = matches!(action.as_str(), "preview-listed" | "download-listed");
            let selected = if action == "page" || action == "download-current" {
                session.borrow().selected.clone()
            } else {
                value.parse::<i64>().ok().and_then(|id| {
                    let state = state.borrow();
                    if listed {
                        state
                            .messages
                            .iter()
                            .filter_map(|m| m.first_attachment.as_ref())
                            .find(|a| a.id == id)
                            .cloned()
                    } else {
                        state
                            .conversation_messages
                            .iter()
                            .chain(state.messages.iter())
                            .find(|m| m.id == message)
                            .and_then(|m| m.attachments.iter().find(|a| a.id == id))
                            .cloned()
                    }
                })
            };
            let Some(selected) = selected else {
                return;
            };
            let action = match action.as_str() {
                "preview-listed" => "preview".into(),
                "download-listed" => "download".into(),
                _ => action,
            };
            if action == "thumbnail" {
                let core_id = Arc::as_ptr(&core) as usize;
                if !thumbnail_candidate(&selected)
                    || !pending_thumbnails
                        .borrow_mut()
                        .insert((core_id, message, selected.id))
                {
                    return;
                }
                if thumbnail_job_sender
                    .try_send((message, selected.clone(), core))
                    .is_err()
                {
                    pending_thumbnails
                        .borrow_mut()
                        .remove(&(core_id, message, selected.id));
                }
                return;
            }
            if ui.get_busy() {
                return;
            }
            let page = value.parse::<u32>().unwrap_or(0);
            if action == "page" && page >= ui.get_pages().max(0) as u32 {
                return;
            }
            if !matches!(
                action.as_str(),
                "preview" | "download" | "download-current" | "page"
            ) {
                return;
            }
            let revision = generation.fetch_add(1, Ordering::SeqCst) + 1;
            let data = session.borrow().document.clone();
            session.borrow_mut().selected = Some(selected.clone());
            *context.borrow_mut() = Some((core.clone(), message));
            if action != "page" {
                ui.set_name(
                    selected
                        .filename
                        .clone()
                        .unwrap_or_else(|| "attachment".into())
                        .into(),
                );
                ui.set_pages(0);
                ui.set_image(Default::default());
                ui.set_text("".into());
                ui.set_is_image(false);
                ui.set_revision(ui.get_revision().wrapping_add(1));
                session.borrow_mut().document = None;
            }
            ui.set_open(true);
            ui.set_busy(true);
            ui.set_status("".into());
            let weak = weak.clone();
            let sender = sender.clone();
            let documents = documents.clone();
            let task = handle.spawn(async move {
                let result: Result<Option<Preview>, String> = async {
                    if action == "page" {
                        let data = data.ok_or("PDF preview has been closed")?;
                        return crate::pdf_preview::render(data.clone(), page, 200)
                            .await
                            .map(|page| Some(Preview::Pdf(data, page)));
                    }
                    let download = action == "download" || action == "download-current";
                    if !download && selected.size.is_some_and(|size| size > 16 * 1024 * 1024) {
                        return Err(
                            "This attachment is too large to preview. Download it to view locally."
                                .into(),
                        );
                    }
                    let path = core
                        .get_attachment(selected.id)
                        .await
                        .map_err(|e| e.to_string())?;
                    if download {
                        let dialog = crate::documents::download_dialog_for(&core).await;
                        documents
                            .export_with(
                                path.into(),
                                crate::documents::safe_name(
                                    selected.filename.as_deref().unwrap_or("attachment"),
                                ),
                                dialog,
                            )
                            .await?;
                        return Ok(None);
                    }
                    let file = tokio::fs::File::open(path)
                        .await
                        .map_err(|e| e.to_string())?;
                    let bytes = read_preview_bytes(file, 16 * 1024 * 1024 + 1).await?;
                    if bytes.len() > 16 * 1024 * 1024 {
                        return Err(
                            "This attachment is too large to preview. Download it to view locally."
                                .into(),
                        );
                    }
                    preview(
                        bytes,
                        selected
                            .mime_type
                            .as_deref()
                            .unwrap_or("application/octet-stream"),
                    )
                    .await
                    .map(Some)
                }
                .await;
                if sender.send((revision, message, core, result)).await.is_ok() {
                    let _ = weak.upgrade_in_event_loop(|app| {
                        app.global::<MailAttachments>().invoke_deliver()
                    });
                }
            });
            session.borrow_mut().task = Some(task.abort_handle());
        });
}

#[cfg(test)]
mod tests {
    use super::*;
    #[tokio::test]
    async fn preview_reads_bound_capacity_and_keep_the_over_limit_sentinel() {
        let directory = tempfile::tempdir().unwrap();
        let path = directory.path().join("attachment.bin");
        let source = (0..200_000)
            .map(|index| (index % 251) as u8)
            .collect::<Vec<_>>();
        tokio::fs::write(&path, &source).await.unwrap();
        for limit in [0, 1, 8191, 8192, 8193, 65_537, 200_001] {
            let bytes = read_preview_bytes(tokio::fs::File::open(&path).await.unwrap(), limit)
                .await
                .unwrap();
            assert_eq!(bytes, source[..source.len().min(limit)]);
            assert!(bytes.capacity() <= limit);
        }
    }
    #[test]
    fn thumbnail_plan_keeps_visible_order_and_four_item_limit() {
        use flectar_mail_core::models::AttachmentMeta;
        let files = (0..10)
            .map(|id| AttachmentMeta {
                id,
                filename: (id != 0).then(|| "photo.png".into()),
                mime_type: Some("image/png".into()),
                size: Some(42),
                is_inline: id == 0,
            })
            .collect::<Vec<_>>();
        let mut rows = attachment_rows(&files);
        rows[0].has_thumbnail = true;
        let ids = thumbnail_ids(&files, &rows);
        assert_eq!(
            ids.iter().map(|id| id.as_str()).collect::<Vec<_>>(),
            ["2", "3", "4", "5"]
        );
        assert_eq!(ids[0].as_ptr(), rows[1].id.as_ptr());
    }

    #[test]
    fn file_kinds_follow_the_type_then_the_name() {
        for (name, media, kind) in [
            ("Joel-Solano-CV.pdf", "application/octet-stream", "pdf"),
            ("scan", "application/pdf", "pdf"),
            ("photo.HEIC", "", "image"),
            (
                "budget.xlsx",
                "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                "spreadsheet",
            ),
            ("totals.csv", "text/csv", "spreadsheet"),
            ("deck.key", "", "presentation"),
            ("letter.docx", "", "document"),
            ("notes.txt", "text/plain", "document"),
            ("book.epub", "application/epub+zip", "document"),
            ("site.zip", "application/zip", "archive"),
            ("invite.ics", "text/calendar", "calendar"),
            ("clip.mov", "video/quicktime", "video"),
            ("memo.m4a", "", "audio"),
            ("config.json", "application/json", "code"),
            ("data.bin", "application/octet-stream", "file"),
        ] {
            assert_eq!(file_kind(name, media), kind, "{name} ({media})");
        }
    }

    #[test]
    fn list_chips_keep_the_extension_of_a_cut_name() {
        assert_eq!(
            split_extension("Joel-Solano-CV.pdf"),
            ("Joel-Solano-CV", ".pdf")
        );
        assert_eq!(split_extension("archive.tar.gz"), ("archive.tar", ".gz"));
        assert_eq!(split_extension("photo.jpeg"), ("photo", ".jpeg"));
        assert_eq!(split_extension(".bashrc"), (".bashrc", ""));
        assert_eq!(split_extension("README"), ("README", ""));
        assert_eq!(
            split_extension("version 1.2 final"),
            ("version 1.2 final", "")
        );
        let chip = list_attachment(&flectar_mail_core::models::AttachmentMeta {
            id: 7,
            filename: Some("portfolio.zip".into()),
            mime_type: Some("application/zip".into()),
            size: Some(9000),
            is_inline: false,
        });
        assert_eq!(chip.id, "7");
        assert_eq!(chip.stem, "portfolio");
        assert_eq!(chip.extension, ".zip");
        assert_eq!(chip.kind, "archive");
        assert!(!chip.previewable);
    }

    #[test]
    fn attachment_rows_preserve_large_ids_and_offer_safe_previews() {
        use flectar_mail_core::models::AttachmentMeta;
        let files = vec![
            AttachmentMeta {
                id: i64::MAX,
                filename: Some("Report.PDF".into()),
                mime_type: None,
                size: Some(1024),
                is_inline: false,
            },
            AttachmentMeta {
                id: 2,
                filename: Some("photo.png".into()),
                mime_type: Some("image/png".into()),
                size: Some(42),
                is_inline: false,
            },
            AttachmentMeta {
                id: 3,
                filename: None,
                mime_type: Some("image/png".into()),
                size: Some(42),
                is_inline: true,
            },
            AttachmentMeta {
                id: 4,
                filename: Some("archive.zip".into()),
                mime_type: Some("application/zip".into()),
                size: Some(42),
                is_inline: false,
            },
        ];
        let rows = attachment_rows(&files);
        assert_eq!(rows.len(), 3);
        assert_eq!(rows[0].id.as_str(), i64::MAX.to_string());
        assert!(rows[0].previewable && rows[1].previewable);
        assert!(!rows[2].previewable);
        assert_eq!(rows[0].kind, "pdf");
        assert_eq!(rows[1].kind, "image");
        assert_eq!(rows[2].kind, "archive");
        assert!(!thumbnail_candidate(&files[0]));
        assert!(thumbnail_candidate(&files[1]));
        assert!(!rows[1].has_thumbnail);
    }
}