//! Blog post management screen — list, create, delete posts.

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 super::App;
use super::widgets;

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

    let project_title = app
        .blog_project_title
        .as_deref()
        .unwrap_or("Blog");

    let title = Line::from(vec![
        Span::styled(" Makenot.work ", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" -- "),
        Span::styled(project_title, Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" -- Blog "),
    ]);

    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(1), // section header
        Constraint::Min(3),   // post list
        Constraint::Length(1), // status line
        Constraint::Length(1), // keybindings
    ])
    .split(inner);

    // Section header
    let count = app.blog_posts.len();
    let header = Paragraph::new(Line::from(vec![
        Span::raw("  "),
        Span::styled("Posts", Style::default().add_modifier(Modifier::BOLD)),
        if count == 0 {
            Span::raw("")
        } else {
            Span::raw(format!(" ({})", count))
        },
    ]));
    frame.render_widget(header, chunks[1]);

    // Post list
    if app.loading {
        let loading = Paragraph::new("  Loading...");
        frame.render_widget(loading, chunks[2]);
    } else if app.blog_posts.is_empty() {
        let empty = Paragraph::new("  No blog posts. Press [n] to create one.");
        frame.render_widget(empty, chunks[2]);
    } else {
        render_post_table(frame, app, chunks[2]);
    }

    // Status line
    if let Some(ref status) = app.blog_status {
        let style = if status.starts_with("Error") {
            Style::default().fg(Color::Red)
        } else {
            Style::default().fg(Color::Green)
        };
        let status_line = Paragraph::new(Line::from(vec![
            Span::raw("  "),
            Span::styled(status.as_str(), style),
        ]));
        frame.render_widget(status_line, chunks[3]);
    }

    // Keybindings
    let mut key_spans = vec![
        Span::raw("  "),
        Span::styled("[j/k]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Nav  "),
        Span::styled("[n]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" New  "),
    ];

    if !app.blog_posts.is_empty() {
        key_spans.extend([
            Span::styled("[d]", Style::default().add_modifier(Modifier::BOLD)),
            Span::raw(" Delete  "),
        ]);
    }

    key_spans.extend([
        Span::styled("[r]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Refresh  "),
        Span::styled("[Esc]", Style::default().add_modifier(Modifier::BOLD)),
        Span::raw(" Back"),
    ]);

    let keys = Paragraph::new(Line::from(key_spans)).style(Style::default().fg(Color::DarkGray));
    frame.render_widget(keys, chunks[4]);
}

fn render_post_table(frame: &mut Frame, app: &App, area: ratatui::layout::Rect) {
    let rows: Vec<Row> = app
        .blog_posts
        .iter()
        .enumerate()
        .map(|(i, post)| {
            let status = if post.is_published {
                "published".to_string()
            } else if let Some(ref pa) = post.publish_at {
                let scheduled = pa.get(..16).unwrap_or(pa);
                format!("sched {}", scheduled)
            } else {
                "draft".to_string()
            };
            let date = post.created_at.get(..10).unwrap_or(&post.created_at);

            Row::new(vec![
                format!("  {}", post.title),
                post.slug.clone(),
                status,
                date.to_string(),
            ])
            .style(widgets::selected_style(i, Some(app.selected_index)))
        })
        .collect();

    let widths = [
        Constraint::Min(20),
        Constraint::Length(20),
        Constraint::Length(22),
        Constraint::Length(12),
    ];

    widgets::render_table(frame, area, &["  Title", "Slug", "Status", "Created"], &widths, rows);
}