1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143

use itertools::Itertools;
use ratatui::{prelude::*, widgets::*};
use unicode_width::UnicodeWidthStr;

use crate::{layout, 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, Default)]
pub struct EmailTab {
    selected_index: usize,
}

impl EmailTab {
    pub fn new(selected_index: usize) -> Self {
        Self {
            selected_index: selected_index % 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 area = layout(area, Direction::Vertical, vec![5, 0]);
        render_inbox(self.selected_index, area[0], buf);
        render_email(self.selected_index, area[1], buf);
    }
}
fn render_inbox(selected_index: usize, area: Rect, buf: &mut Buffer) {
    let area = layout(area, Direction::Vertical, vec![1, 0]);
    let theme = THEME.email;
    Tabs::new(vec![" Inbox ", " Sent ", " Drafts "])
        .style(theme.tabs)
        .highlight_style(theme.tabs_selected)
        .select(0)
        .divider("")
        .render(area[0], 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()]))
        })
        .collect_vec();
    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),
        area[1],
        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(area[1], 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 area = layout(inner, Direction::Vertical, vec![3, 0]);
        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(area[0], buf);
        let body = email.body.lines().map(Line::from).collect_vec();
        Paragraph::new(body).style(theme.body).render(area[1], buf);
    } else {
        Paragraph::new("No email selected").render(inner, buf);
    }
}