forge-orchestrator 1.6.3

use crate::core::task::TaskPhase;
use crate::tui::uat_app::{UatApp, UatStatus, UatTask, UatViewMode};
use ratatui::Frame;
use ratatui::layout::{Constraint, Layout, Rect};
use ratatui::style::{Color, Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Borders, List, ListItem, Paragraph, Wrap};

pub fn render(f: &mut Frame, app: &mut UatApp) {
    let chunks = Layout::vertical([
        Constraint::Length(3), // Header
        Constraint::Fill(1),   // Main content (task list + criteria)
        Constraint::Length(3), // Input area
        Constraint::Length(1), // Footer
    ])
    .split(f.area());

    render_header(f, app, chunks[0]);
    render_main(f, app, chunks[1]);
    render_input(f, app, chunks[2]);
    render_footer(f, app, chunks[3]);
}

fn render_header(f: &mut Frame, app: &UatApp, area: Rect) {
    let (total, passed, with_findings, _untested) = app.stats();
    let tested = passed + with_findings;

    // Get project name from state if available
    let project_name = {
        let state_mgr = crate::core::state::StateManager::new(&app.forge_dir);
        state_mgr
            .load()
            .map(|s| s.project_name.clone())
            .unwrap_or_default()
    };

    let mode_indicator = match app.view_mode {
        UatViewMode::UatTasks => "[U-xxx]",
        UatViewMode::AllCompleted => "[All]",
    };

    let title = if project_name.is_empty() {
        format!(" FORGE UAT {mode_indicator} \u{2014} {tested}/{total} tested ")
    } else {
        format!(
            " FORGE UAT {mode_indicator} \u{2014} {project_name} \u{2014} {tested}/{total} tested "
        )
    };

    let block = Block::default()
        .title(title)
        .borders(Borders::ALL)
        .style(Style::default().fg(Color::Cyan));
    f.render_widget(block, area);
}

fn render_main(f: &mut Frame, app: &mut UatApp, area: Rect) {
    let main_chunks = Layout::horizontal([
        Constraint::Percentage(40), // Task list
        Constraint::Percentage(60), // Criteria + findings
    ])
    .split(area);

    render_task_list(f, app, main_chunks[0]);
    render_detail_panel(f, app, main_chunks[1]);
}

fn render_task_list(f: &mut Frame, app: &mut UatApp, area: Rect) {
    let items: Vec<ListItem> = app
        .tasks
        .iter()
        .enumerate()
        .map(|(i, t)| {
            let status_icon = match t.uat_status {
                UatStatus::Passed => Span::styled("  \u{2713} ", Style::default().fg(Color::Green)),
                UatStatus::HasFindings => {
                    Span::styled("  \u{2717} ", Style::default().fg(Color::Red))
                }
                UatStatus::Untested => {
                    Span::styled("  \u{25CB} ", Style::default().fg(Color::DarkGray))
                }
            };

            let title = truncate_chars(&t.task.title, 30);

            let id_style = if i == app.selected_task {
                Style::default()
                    .fg(Color::Cyan)
                    .add_modifier(Modifier::BOLD)
            } else {
                Style::default().fg(Color::DarkGray)
            };

            let line = Line::from(vec![
                status_icon,
                Span::styled(format!("{} ", t.task.id), id_style),
                Span::raw(title),
            ]);

            ListItem::new(line)
        })
        .collect();

    let list = List::new(items)
        .block(
            Block::default()
                .title(" Tasks ")
                .borders(Borders::ALL)
                .style(Style::default().fg(Color::White)),
        )
        .highlight_style(Style::default().bg(Color::DarkGray));

    // Use stateful rendering for auto-scroll
    f.render_stateful_widget(list, area, &mut app.list_state);
}

fn render_detail_panel(f: &mut Frame, app: &UatApp, area: Rect) {
    let mut lines: Vec<Line> = Vec::new();

    if let Some(selected) = app.tasks.get(app.selected_task) {
        let is_uat_task = selected.task.phase == Some(TaskPhase::Uat);

        // Task header
        lines.push(Line::styled(
            format!(" {} \u{2014} {}", selected.task.id, selected.task.title),
            Style::default()
                .fg(Color::Cyan)
                .add_modifier(Modifier::BOLD),
        ));
        lines.push(Line::raw(""));

        if is_uat_task {
            // Three-tier hierarchy view for U-xxx tasks
            render_uat_hierarchy(&mut lines, selected, app);
        } else {
            // Legacy view for non-U-xxx tasks
            render_legacy_detail(&mut lines, selected, app);
        }
    }

    let paragraph = Paragraph::new(lines)
        .block(
            Block::default()
                .title(" Details ")
                .borders(Borders::ALL)
                .style(Style::default().fg(Color::White)),
        )
        .wrap(Wrap { trim: false });

    f.render_widget(paragraph, area);
}

/// Render three-tier hierarchy for U-xxx UAT tasks: UAT criteria → V-xxx summary → T-xxx context
fn render_uat_hierarchy<'a>(lines: &mut Vec<Line<'a>>, selected: &'a UatTask, app: &'a UatApp) {
    // 1. UAT Criteria (Yellow)
    if !selected.task.acceptance_criteria.is_empty() {
        lines.push(Line::styled(
            " UAT Criteria (human-testable):",
            Style::default()
                .fg(Color::Yellow)
                .add_modifier(Modifier::BOLD),
        ));
        lines.push(Line::raw(""));

        for criterion in &selected.task.acceptance_criteria {
            let check = if selected.uat_status == UatStatus::Passed {
                Span::styled("  [\u{2713}] ", Style::default().fg(Color::Green))
            } else {
                Span::styled("  [ ] ", Style::default().fg(Color::DarkGray))
            };
            lines.push(Line::from(vec![check, Span::raw(criterion.clone())]));
        }
        lines.push(Line::raw(""));
    }

    // Find parent T-xxx task
    let parent_t = selected
        .task
        .parent_task
        .as_deref()
        .and_then(|parent_id| app.all_tasks.iter().find(|t| t.id == parent_id));

    // Find corresponding V-xxx task (child of same T-xxx parent)
    let verify_task = if let Some(parent_id) = selected.task.parent_task.as_deref() {
        app.all_tasks.iter().find(|t| {
            t.parent_task.as_deref() == Some(parent_id) && t.phase == Some(TaskPhase::Verify)
        })
    } else {
        None
    };

    // 2. AI Verification summary (Cyan)
    if let Some(v_task) = verify_task {
        lines.push(Line::styled(
            format!(" AI Verification ({}):", v_task.id),
            Style::default()
                .fg(Color::Cyan)
                .add_modifier(Modifier::BOLD),
        ));
        let status_str = format!("{:?}", v_task.status);
        lines.push(Line::from(vec![
            Span::styled("  Status: ", Style::default().fg(Color::DarkGray)),
            Span::styled(status_str, Style::default().fg(Color::White)),
        ]));
        if let Some(agent) = &v_task.assigned_to {
            lines.push(Line::from(vec![
                Span::styled("  Agent: ", Style::default().fg(Color::DarkGray)),
                Span::styled(format!("{agent}"), Style::default().fg(Color::Yellow)),
            ]));
        }
        lines.push(Line::raw(""));
    }

    // 3. Build Context (DarkGray)
    if let Some(t_task) = parent_t {
        lines.push(Line::styled(
            format!(" Build Context ({}):", t_task.id),
            Style::default()
                .fg(Color::DarkGray)
                .add_modifier(Modifier::BOLD),
        ));
        if !t_task.description.is_empty() && t_task.description != "desc" {
            for desc_line in t_task.description.lines().take(3) {
                lines.push(Line::from(vec![
                    Span::raw("  "),
                    Span::styled(desc_line, Style::default().fg(Color::DarkGray)),
                ]));
            }
        }
        if !t_task.locked_files.is_empty() {
            lines.push(Line::from(vec![
                Span::styled("  Files: ", Style::default().fg(Color::DarkGray)),
                Span::styled(
                    t_task.locked_files.join(", "),
                    Style::default().fg(Color::DarkGray),
                ),
            ]));
        }
    }

    // Findings for this task
    render_findings(lines, selected, app);
}

/// Render legacy detail view for non-U-xxx tasks
fn render_legacy_detail<'a>(lines: &mut Vec<Line<'a>>, selected: &'a UatTask, app: &'a UatApp) {
    // Show description
    if !selected.task.description.is_empty()
        && selected.task.description != "desc"
        && selected.task.description != selected.task.title
    {
        lines.push(Line::styled(
            " Description:",
            Style::default()
                .fg(Color::White)
                .add_modifier(Modifier::BOLD),
        ));
        for desc_line in selected.task.description.lines() {
            lines.push(Line::from(vec![
                Span::raw("  "),
                Span::styled(desc_line, Style::default().fg(Color::Gray)),
            ]));
        }
        lines.push(Line::raw(""));
    }

    // Acceptance criteria
    if !selected.task.acceptance_criteria.is_empty() {
        lines.push(Line::styled(
            " Acceptance Criteria:",
            Style::default()
                .fg(Color::Yellow)
                .add_modifier(Modifier::BOLD),
        ));
        lines.push(Line::raw(""));

        for criterion in &selected.task.acceptance_criteria {
            let check = if selected.uat_status == UatStatus::Passed {
                Span::styled("  [\u{2713}] ", Style::default().fg(Color::Green))
            } else {
                Span::styled("  [ ] ", Style::default().fg(Color::DarkGray))
            };
            lines.push(Line::from(vec![check, Span::raw(criterion.clone())]));
        }
    }

    // Agent info
    if let Some(agent) = &selected.task.assigned_to {
        lines.push(Line::raw(""));
        lines.push(Line::from(vec![
            Span::styled(" Agent: ", Style::default().fg(Color::DarkGray)),
            Span::styled(format!("{agent}"), Style::default().fg(Color::Yellow)),
        ]));
    }

    render_findings(lines, selected, app);
}

/// Render findings section (shared by both views)
fn render_findings<'a>(lines: &mut Vec<Line<'a>>, selected: &'a UatTask, app: &'a UatApp) {
    let task_findings: Vec<_> = app
        .findings
        .iter()
        .filter(|f| f.related_tasks.contains(&selected.task.id))
        .collect();

    if !task_findings.is_empty() {
        lines.push(Line::raw(""));
        lines.push(Line::styled(
            format!(" Findings ({}):", task_findings.len()),
            Style::default().fg(Color::Red).add_modifier(Modifier::BOLD),
        ));
        lines.push(Line::raw(""));

        for finding in task_findings {
            let sev_color = match finding.severity {
                crate::core::finding::FindingSeverity::Critical => Color::Red,
                crate::core::finding::FindingSeverity::High => Color::LightRed,
                crate::core::finding::FindingSeverity::Medium => Color::Yellow,
                crate::core::finding::FindingSeverity::Low => Color::DarkGray,
                crate::core::finding::FindingSeverity::Positive => Color::Green,
            };

            lines.push(Line::from(vec![
                Span::styled(
                    format!("  {} ", finding.id),
                    Style::default().fg(Color::Cyan),
                ),
                Span::raw(truncate_chars(&finding.description, 40)),
            ]));
            lines.push(Line::from(vec![
                Span::raw("    "),
                Span::styled(
                    format!("severity: {}", finding.severity),
                    Style::default().fg(sev_color),
                ),
            ]));
        }
    }
}

fn render_input(f: &mut Frame, app: &UatApp, area: Rect) {
    let (style, text) = if app.input_active {
        (
            Style::default().fg(Color::Cyan),
            format!(" > {}\u{2588}", app.input_buffer),
        )
    } else if let Some(msg) = &app.status_message {
        (Style::default().fg(Color::Green), format!("  {msg}"))
    } else {
        (
            Style::default().fg(Color::DarkGray),
            "  Press Enter or 'f' to capture a finding".to_string(),
        )
    };

    let block = Block::default().borders(Borders::ALL).style(style);
    let paragraph = Paragraph::new(text).block(block);
    f.render_widget(paragraph, area);
}

fn render_footer(f: &mut Frame, app: &UatApp, area: Rect) {
    let (total, passed, with_findings, untested) = app.stats();

    let footer = Line::from(vec![
        Span::styled(" \u{2191}\u{2193} ", Style::default().fg(Color::Yellow)),
        Span::raw("navigate "),
        Span::styled(" f ", Style::default().fg(Color::Yellow)),
        Span::raw("finding "),
        Span::styled(" p ", Style::default().fg(Color::Yellow)),
        Span::raw("pass "),
        Span::styled(" u ", Style::default().fg(Color::Yellow)),
        Span::raw("unmark "),
        Span::styled(" t ", Style::default().fg(Color::Yellow)),
        Span::raw("toggle "),
        Span::styled(" q ", Style::default().fg(Color::Yellow)),
        Span::raw("quit "),
        Span::raw(" | "),
        Span::styled(format!("{passed}"), Style::default().fg(Color::Green)),
        Span::raw(" pass "),
        Span::styled(format!("{with_findings}"), Style::default().fg(Color::Red)),
        Span::raw(" issues "),
        Span::styled(format!("{untested}"), Style::default().fg(Color::DarkGray)),
        Span::raw(format!(" untested / {total}")),
    ]);

    f.render_widget(Paragraph::new(footer), area);
}

/// UTF-8 safe truncation (never slice byte boundaries)
pub(crate) fn truncate_chars(s: &str, max: usize) -> String {
    let count = s.chars().count();
    if count <= max {
        s.to_string()
    } else {
        let truncated: String = s.chars().take(max.saturating_sub(3)).collect();
        format!("{truncated}...")
    }
}