demo2/tabs/
email.rs

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use itertools::Itertools;
use ratatui::{
    buffer::Buffer,
    layout::{Constraint, Layout, Margin, Rect},
    style::{Styled, Stylize},
    text::Line,
    widgets::{
        Block, BorderType, Borders, Clear, List, ListItem, ListState, Padding, Paragraph,
        Scrollbar, ScrollbarState, StatefulWidget, Tabs, Widget,
    },
};
use unicode_width::UnicodeWidthStr;

use crate::{RgbSwatch, THEME};

#[derive(Debug, Default)]
pub struct Email {
    from: &'static str,
    subject: &'static str,
    body: &'static str,
}

const EMAILS: &[Email] = &[
    Email {
        from: "Alice <alice@example.com>",
        subject: "Hello",
        body: "Hi Bob,\nHow are you?\n\nAlice",
    },
    Email {
        from: "Bob <bob@example.com>",
        subject: "Re: Hello",
        body: "Hi Alice,\nI'm fine, thanks!\n\nBob",
    },
    Email {
        from: "Charlie <charlie@example.com>",
        subject: "Re: Hello",
        body: "Hi Alice,\nI'm fine, thanks!\n\nCharlie",
    },
    Email {
        from: "Dave <dave@example.com>",
        subject: "Re: Hello (STOP REPLYING TO ALL)",
        body: "Hi Everyone,\nPlease stop replying to all.\n\nDave",
    },
    Email {
        from: "Eve <eve@example.com>",
        subject: "Re: Hello (STOP REPLYING TO ALL)",
        body: "Hi Everyone,\nI'm reading all your emails.\n\nEve",
    },
];

#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub struct EmailTab {
    row_index: usize,
}

impl EmailTab {
    /// Select the previous email (with wrap around).
    pub fn prev(&mut self) {
        self.row_index = self.row_index.saturating_add(EMAILS.len() - 1) % EMAILS.len();
    }

    /// Select the next email (with wrap around).
    pub fn next(&mut self) {
        self.row_index = self.row_index.saturating_add(1) % EMAILS.len();
    }
}

impl Widget for EmailTab {
    fn render(self, area: Rect, buf: &mut Buffer) {
        RgbSwatch.render(area, buf);
        let area = area.inner(Margin {
            vertical: 1,
            horizontal: 2,
        });
        Clear.render(area, buf);
        let vertical = Layout::vertical([Constraint::Length(5), Constraint::Min(0)]);
        let [inbox, email] = vertical.areas(area);
        render_inbox(self.row_index, inbox, buf);
        render_email(self.row_index, email, buf);
    }
}
fn render_inbox(selected_index: usize, area: Rect, buf: &mut Buffer) {
    let vertical = Layout::vertical([Constraint::Length(1), Constraint::Min(0)]);
    let [tabs, inbox] = vertical.areas(area);
    let theme = THEME.email;
    Tabs::new(vec![" Inbox ", " Sent ", " Drafts "])
        .style(theme.tabs)
        .highlight_style(theme.tabs_selected)
        .select(0)
        .divider("")
        .render(tabs, buf);

    let highlight_symbol = ">>";
    let from_width = EMAILS
        .iter()
        .map(|e| e.from.width())
        .max()
        .unwrap_or_default();
    let items = EMAILS.iter().map(|e| {
        let from = format!("{:width$}", e.from, width = from_width).into();
        ListItem::new(Line::from(vec![from, " ".into(), e.subject.into()]))
    });
    let mut state = ListState::default().with_selected(Some(selected_index));
    StatefulWidget::render(
        List::new(items)
            .style(theme.inbox)
            .highlight_style(theme.selected_item)
            .highlight_symbol(highlight_symbol),
        inbox,
        buf,
        &mut state,
    );
    let mut scrollbar_state = ScrollbarState::default()
        .content_length(EMAILS.len())
        .position(selected_index);
    Scrollbar::default()
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▐")
        .render(inbox, buf, &mut scrollbar_state);
}

fn render_email(selected_index: usize, area: Rect, buf: &mut Buffer) {
    let theme = THEME.email;
    let email = EMAILS.get(selected_index);
    let block = Block::new()
        .style(theme.body)
        .padding(Padding::new(2, 2, 0, 0))
        .borders(Borders::TOP)
        .border_type(BorderType::Thick);
    let inner = block.inner(area);
    block.render(area, buf);
    if let Some(email) = email {
        let vertical = Layout::vertical([Constraint::Length(3), Constraint::Min(0)]);
        let [headers_area, body_area] = vertical.areas(inner);
        let headers = vec![
            Line::from(vec![
                "From: ".set_style(theme.header),
                email.from.set_style(theme.header_value),
            ]),
            Line::from(vec![
                "Subject: ".set_style(theme.header),
                email.subject.set_style(theme.header_value),
            ]),
            "-".repeat(inner.width as usize).dim().into(),
        ];
        Paragraph::new(headers)
            .style(theme.body)
            .render(headers_area, buf);
        let body = email.body.lines().map(Line::from).collect_vec();
        Paragraph::new(body)
            .style(theme.body)
            .render(body_area, buf);
    } else {
        Paragraph::new("No email selected").render(inner, buf);
    }
}