//! 日志页：**单列**版面的第二个用例（两行页头 84 + 正文列 ≤435）。
//!
//! 与下载页的区别在页头：日志页的页头是**两行**（标题 + 一行运行状态），
//! 高度走 `LayoutMetrics::page_header_tall_height`（84），这是 12b §16.1 那栏在骨架期的落地。
//!
//! 内容区给「日志源」一张卡（文件行）+ 空态位（当前没有输出）。真正的等宽日志视图属于
//! 后续「日志页接事件流」的 mission，本页只负责版式。

use iced::widget::{column, row};
use iced::{Alignment, Element, Length, Padding};

use unlucky_design::color::Role;
use unlucky_design::component_map::Component;
use unlucky_design::icons::IconKind;
use unlucky_design::spacing::Space;
use unlucky_design::typography::TypeRole;

use crate::theme::Ui;

use super::frame::{self, Header};
use super::layout::FrameMetrics;
use super::{Action, Message};

/// 演示日志源（文件名 + 大小/时间）。
const SOURCES: [(&str, &str); 3] = [
    ("launcher.log", "128 KiB · live"),
    ("launch-2026-11-01T09-14-02.log", "412 KiB · 09:14"),
    ("diagnose-2026-10-31.yaml", "18 KiB · yesterday"),
];

/// 整页。
pub fn view<'a>(ui: &'a Ui, metrics: FrameMetrics) -> Element<'a, Message> {
    let header = Header::new("Logs")
        .subtitle("Launcher and game output · nothing is running right now")
        .action(frame::text_action(ui, "Open folder", Action::OpenLogs))
        .action(frame::text_action(
            ui,
            "Copy diagnostics",
            Action::CopyDiagnostics,
        ))
        .action(frame::text_action(ui, "Clear", Action::ClearLogs));

    let body = frame::single_column(
        metrics,
        column![
            source_card(ui),
            frame::empty_state(
                ui,
                IconKind::Logs,
                "No output yet",
                "Logs stream here while the launcher or the game is running. Start an instance to see \
                 the first lines appear.",
                vec![frame::text_action(ui, "Start an instance", Action::Play)],
            ),
        ]
        .spacing(ui.space(Space::X4))
        .width(Length::Fill)
        .height(Length::Fill),
    );

    frame::page(ui, metrics, header, body)
}

/// 日志源列表（12b 的 `ListItem` 档：行文 `BodyLarge`、副文案 `BodySmall`）。
fn source_card<'a>(ui: &'a Ui) -> Element<'a, Message> {
    let spec = Component::ListItem.spec();
    let mut rows = column![].spacing(0.0).width(Length::Fill);

    for (index, (name, meta)) in SOURCES.iter().enumerate() {
        if index > 0 {
            rows = rows.push(frame::divider(ui));
        }

        rows = rows.push(
            row![
                frame::glyph_box(
                    IconKind::Logs,
                    ui.color(Role::OnSurfaceVariant),
                    frame::ICON_PX
                ),
                column![
                    frame::text_role(ui, spec.text, false, name, ui.color(Role::OnSurface)),
                    frame::text_role(
                        ui,
                        spec.support.unwrap_or(TypeRole::BodySmall),
                        false,
                        meta,
                        ui.color(Role::OnSurfaceVariant),
                    ),
                ]
                .spacing(0.0)
                .width(Length::Fill),
            ]
            .spacing(ui.space(Space::X3))
            .width(Length::Fill)
            .align_y(Alignment::Center)
            .padding(Padding::from([ui.space(Space::X2), ui.space(Space::X2)])),
        );
    }

    frame::card(ui, rows)
}

#[cfg(test)]
mod tests {
    use super::super::layout::{frame_metrics, measure_cap_px, PaneKit};
    use super::*;
    use unlucky_design::color::SchemeFlavor;
    use unlucky_design::typography::Platform;

    use crate::theme::Families;

    #[test]
    fn logs_page_is_single_column_and_capped() {
        for width in [700.0, 1180.0, 1600.0] {
            let metrics = frame_metrics(PaneKit::Single, width);
            assert!(metrics.secondary.is_none());
            assert!(metrics.column <= measure_cap_px() + f32::EPSILON);
        }
    }

    #[test]
    fn header_is_two_lines_because_of_the_status_subtitle() {
        let ui = Ui::with_platform(
            SchemeFlavor::Dark,
            Platform::Windows,
            Families {
                text: "Segoe UI",
                display: "Segoe UI",
                mono: "Consolas",
            },
        );
        assert_eq!(ui.metrics().header_height(true), 84.0);
        assert!(ui.metrics().header_height(true) > ui.metrics().header_height(false));
    }

    #[test]
    fn every_source_row_has_a_name_and_meta() {
        assert_eq!(SOURCES.len(), 3);
        for (name, meta) in SOURCES {
            assert!(name.contains("log") || name.contains("yaml"));
            assert!(!meta.is_empty());
        }
    }
}