//! Home screen — project list with stats overview.

use ratatui::Frame;
use ratatui::layout::{Constraint, Layout};
use ratatui::style::{Color, Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Borders, Paragraph, Row};

use crate::format;

use super::App;
use super::widgets;

pub fn render(frame: &mut Frame, app: &App) {
    let area = frame.area();

    let tier_label = app
        .user
        .creator_tier
        .as_deref()
        .map(format::format_tier)
        .unwrap_or("No tier");

    let title = Line::from(vec![
        Span::styled(" Makenot.work ", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" ── "),
        Span::styled(
            &app.user.username,
            Style::default().add_modifier(Modifier::BOLD),
        ),
        Span::raw(" ── "),
        Span::raw(tier_label),
        Span::raw(" "),
    ]);

    let block = Block::default()
        .title(title)
        .borders(Borders::ALL)
        .border_style(Style::default().fg(Color::Gray));

    let inner = block.inner(area);
    frame.render_widget(block, area);

    let chunks = Layout::vertical([
        Constraint::Length(1), // spacer
        Constraint::Length(3), // stats bar
        Constraint::Length(1), // spacer
        Constraint::Length(1), // section header
        Constraint::Min(3),   // project list
        Constraint::Length(1), // keybindings
    ])
    .split(inner);

    // Stats bar
    render_stats(frame, app, chunks[1]);

    // Section header
    let header = Paragraph::new(Line::from(vec![
        Span::raw("  "),
        Span::styled("Projects", Style::default().add_modifier(Modifier::BOLD)),
        if app.projects.is_empty() {
            Span::raw("")
        } else {
            Span::raw(format!(" ({})", app.projects.len()))
        },
    ]));
    frame.render_widget(header, chunks[3]);

    // Project list
    if app.loading {
        let loading = Paragraph::new("  Loading...");
        frame.render_widget(loading, chunks[4]);
    } else if app.projects.is_empty() {
        let empty = Paragraph::new("  No projects yet.");
        frame.render_widget(empty, chunks[4]);
    } else {
        render_project_table(frame, app, chunks[4]);
    }

    // Keybindings
    let keys = Paragraph::new(Line::from(vec![
        Span::raw("  "),
        Span::styled("[j/k]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Navigate  "),
        Span::styled("[Enter]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Open  "),
        Span::styled("[u]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Upload  "),
        Span::styled("[a]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Analytics  "),
        Span::styled("[c]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Promo  "),
        Span::styled("[s]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Settings  "),
        Span::styled("[r]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Refresh  "),
        Span::styled("[q]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Quit"),
    ]))
    .style(Style::default().fg(Color::DarkGray));
    frame.render_widget(keys, chunks[5]);
}

fn render_stats(frame: &mut Frame, app: &App, area: ratatui::layout::Rect) {
    let stats_chunks = Layout::horizontal([
        Constraint::Ratio(1, 4),
        Constraint::Ratio(1, 4),
        Constraint::Ratio(1, 4),
        Constraint::Ratio(1, 4),
    ])
    .split(area);

    let (revenue, sales, followers, items) = if let Some(ref s) = app.stats {
        (
            format::format_cents(s.current_revenue_cents),
            s.current_sales.to_string(),
            s.current_followers.to_string(),
            s.total_items.to_string(),
        )
    } else {
        ("--".into(), "--".into(), "--".into(), "--".into())
    };

    let stat_items = [
        ("Revenue", &revenue),
        ("Sales", &sales),
        ("Followers", &followers),
        ("Items", &items),
    ];

    for (i, (label, value)) in stat_items.iter().enumerate() {
        let block = Block::default()
            .borders(Borders::ALL)
            .border_style(Style::default().fg(Color::DarkGray));
        let inner = block.inner(stats_chunks[i]);
        frame.render_widget(block, stats_chunks[i]);

        let text = Paragraph::new(Line::from(vec![
            Span::styled(
                format!(" {value}"),
                Style::default().add_modifier(Modifier::BOLD),
            ),
            Span::styled(format!(" {label}"), Style::default().fg(Color::DarkGray)),
        ]));
        frame.render_widget(text, inner);
    }
}

fn render_project_table(frame: &mut Frame, app: &App, area: ratatui::layout::Rect) {
    let rows: Vec<Row> = app
        .projects
        .iter()
        .enumerate()
        .map(|(i, p)| {
            let visibility = if p.is_public { "public" } else { "draft" };

            Row::new(vec![
                format!("  {}", p.title),
                format::format_project_type(&p.project_type).to_string(),
                visibility.to_string(),
                p.item_count.to_string(),
                format::format_cents(p.revenue_cents),
            ])
            .style(widgets::selected_style(i, Some(app.selected_index)))
        })
        .collect();

    let widths = [
        Constraint::Min(20),
        Constraint::Length(12),
        Constraint::Length(8),
        Constraint::Length(7),
        Constraint::Length(12),
    ];

    widgets::render_table(frame, area, &["  Title", "Type", "Status", "Items", "Revenue"], &widths, rows);
}