// SPDX-FileCopyrightText: 2026 RAprogramm <andrey.rozanov.vl@gmail.com>
// SPDX-License-Identifier: MIT

//! Account widget — displays account information in a bordered panel.

use ratatui::{
    Frame,
    layout::Rect,
    style::{Modifier, Style},
    text::{Line, Span},
    widgets::{Block, BorderType, Borders, Paragraph}
};
use rust_i18n::t;

use crate::tui::app::{AccountInfo, App};

/// Renders the account information panel.
///
/// # Overview
///
/// Displays account ID, balance, and status inside a bordered block
/// styled with the current theme palette.
pub struct AccountWidget {
    enabled: bool
}

impl AccountWidget {
    /// Creates a new account widget with enabled state.
    ///
    /// # Arguments
    ///
    /// * `enabled` - Whether the widget is initially visible.
    #[must_use]
    pub const fn new(enabled: bool) -> Self {
        Self {
            enabled
        }
    }

    /// Formats an account ID as a string.
    ///
    /// # Arguments
    ///
    /// * `id` - The account ID value.
    ///
    /// # Returns
    ///
    /// A string representation without trailing decimal points.
    fn format_account_id(id: i64) -> String {
        id.to_string()
    }

    /// Builds the styled lines for the account info panel.
    ///
    /// # Arguments
    ///
    /// * `account` - The account information to display.
    /// * `profile` - The name of the active profile.
    /// * `palette` - The theme color palette.
    fn build_lines(
        account: &AccountInfo,
        profile: &str,
        palette: crate::tui::themes::Palette
    ) -> Vec<Line<'static>> {
        let (id_label, id_text) = if account.login.is_empty() {
            ("ID ", Self::format_account_id(account.account_id))
        } else {
            ("\u{1F464} ", account.login.clone())
        };
        let status_color = match account.status.as_str() {
            "active" | "running" | "enabled" => palette.success,
            "inactive" | "suspended" => palette.warning,
            "error" | "failed" => palette.error,
            _ => palette.dim
        };
        let balance = if account.balance.is_empty() {
            "—".to_string()
        } else {
            account.balance.clone()
        };
        let status = match account.status.as_str() {
            "" => t!("account.status_unknown").to_string(),
            "active" => t!("account.status_active").to_string(),
            "running" => t!("account.status_running").to_string(),
            "enabled" => t!("account.status_enabled").to_string(),
            "inactive" => t!("account.status_inactive").to_string(),
            "suspended" => t!("account.status_suspended").to_string(),
            "error" => t!("account.status_error").to_string(),
            "failed" => t!("account.status_failed").to_string(),
            other => other.to_string()
        };
        let sep = || Span::styled("   │   ", Style::default().fg(palette.border));

        vec![Line::from(vec![
            Span::styled(
                "twc",
                Style::default()
                    .fg(palette.title)
                    .add_modifier(Modifier::BOLD)
            ),
            Span::styled(format!(" [{profile}]"), Style::default().fg(palette.accent)),
            sep(),
            Span::styled(id_label, Style::default().fg(palette.dim)),
            Span::styled(
                id_text,
                Style::default()
                    .fg(palette.header)
                    .add_modifier(Modifier::BOLD)
            ),
            sep(),
            Span::styled(
                format!("{} ", t!("account.balance")),
                Style::default().fg(palette.dim)
            ),
            Span::styled(
                balance,
                Style::default()
                    .fg(palette.accent)
                    .add_modifier(Modifier::BOLD)
            ),
            sep(),
            Span::styled("\u{25CF} ", Style::default().fg(status_color)),
            Span::styled(status, Style::default().fg(status_color)),
        ])]
    }
}

impl crate::tui::widgets::Widget for AccountWidget {
    fn id(&self) -> &'static str {
        "account"
    }

    fn name(&self) -> &'static str {
        "Account"
    }

    fn enabled(&self) -> bool {
        self.enabled
    }

    fn toggle(&mut self) {
        self.enabled = !self.enabled;
    }

    fn render(&self, frame: &mut Frame, area: Rect, app: &App) {
        let palette = app.theme.palette();
        let lines = Self::build_lines(&app.account, &app.active_profile, palette);

        let paragraph = Paragraph::new(lines).block(
            Block::default()
                .borders(Borders::ALL)
                .border_type(BorderType::Rounded)
                .border_style(Style::default().fg(palette.border))
                .title(Line::from(Span::styled(
                    format!(" {} ", t!("account.title")),
                    Style::default()
                        .fg(palette.title)
                        .add_modifier(Modifier::BOLD)
                )))
        );

        frame.render_widget(paragraph, area);
    }
}

#[cfg(test)]
mod tests {
    use ratatui::style::Color;

    use super::*;
    use crate::tui::{themes::Theme, widgets::Widget};

    fn make_account(id: i64, balance: &str, status: &str) -> AccountInfo {
        AccountInfo {
            login:      String::new(),
            account_id: id,
            balance:    balance.to_string(),
            status:     status.to_string()
        }
    }

    #[test]
    fn widget_id_is_account() {
        let widget = AccountWidget::new(true);
        assert_eq!(widget.id(), "account");
    }

    #[test]
    fn widget_name_is_account() {
        let widget = AccountWidget::new(true);
        assert_eq!(widget.name(), "Account");
    }

    #[test]
    fn widget_enabled_by_default() {
        let widget = AccountWidget::new(true);
        assert!(widget.enabled());
    }

    #[test]
    fn widget_disabled_when_not_enabled() {
        let widget = AccountWidget::new(false);
        assert!(!widget.enabled());
    }

    #[test]
    fn widget_toggle_enables() {
        let mut widget = AccountWidget::new(false);
        widget.toggle();
        assert!(widget.enabled());
    }

    #[test]
    fn widget_toggle_disables() {
        let mut widget = AccountWidget::new(true);
        widget.toggle();
        assert!(!widget.enabled());
    }

    #[test]
    fn format_account_id_integer() {
        assert_eq!(AccountWidget::format_account_id(12345), "12345");
    }

    #[test]
    fn format_account_id_zero() {
        assert_eq!(AccountWidget::format_account_id(0), "0");
    }

    #[test]
    fn format_account_id_negative() {
        assert_eq!(AccountWidget::format_account_id(-100), "-100");
    }

    fn joined(lines: &[Line]) -> String {
        lines
            .iter()
            .flat_map(|l| l.spans.iter())
            .map(|s| s.content.as_ref())
            .collect::<String>()
    }

    fn status_fg(lines: &[Line]) -> Option<Color> {
        lines[0].spans.last().and_then(|s| s.style.fg)
    }

    #[test]
    fn build_lines_active_status() {
        let account = make_account(12345, "1,234.56 RUB", "active");
        let palette = Theme::GruvboxDark.palette();
        let lines = AccountWidget::build_lines(&account, "default", palette);

        assert_eq!(lines.len(), 1);
        let text = joined(&lines);
        assert!(text.contains("12345"));
        assert!(text.contains("1,234.56 RUB"));
        assert!(text.contains("active"));
        assert_eq!(status_fg(&lines), Some(palette.success));
    }

    #[test]
    fn build_lines_inactive_status_has_warning_color() {
        let account = make_account(100, "0.00 RUB", "inactive");
        let palette = Theme::GruvboxDark.palette();
        let lines = AccountWidget::build_lines(&account, "default", palette);
        assert_eq!(status_fg(&lines), Some(palette.warning));
    }

    #[test]
    fn build_lines_error_status_has_error_color() {
        let account = make_account(200, "0.00 RUB", "error");
        let palette = Theme::GruvboxDark.palette();
        let lines = AccountWidget::build_lines(&account, "default", palette);
        assert_eq!(status_fg(&lines), Some(palette.error));
    }

    #[test]
    fn build_lines_default_status_has_fg_color() {
        let account = make_account(300, "0.00 RUB", "unknown");
        let palette = Theme::GruvboxDark.palette();
        let lines = AccountWidget::build_lines(&account, "default", palette);

        assert_eq!(status_fg(&lines), Some(palette.dim));
    }

    #[test]
    fn build_lines_empty_account() {
        let account = AccountInfo::default();
        let palette = Theme::GruvboxDark.palette();
        let lines = AccountWidget::build_lines(&account, "default", palette);

        assert_eq!(lines.len(), 1);
        let text = joined(&lines);
        assert!(text.contains("ID"));
        assert!(text.contains('0'));
        assert!(text.contains('—'));
        assert!(text.contains("unknown"));
    }

    #[test]
    fn widget_trait_object_is_send() {
        let widget: Box<dyn Widget + Send> = Box::new(AccountWidget::new(true));
        assert_eq!(widget.id(), "account");
    }
}
