//! Layer 2 of docs/RUST.md's "Three test layers": the fixture-backed
//! transcript screen in a phone-shaped window, for looking at.
//!
//!     iris/run-headless.sh phone --phone --shot /tmp/phone.png -- -p transcript-fixture
//!
//! `--phone` sets the headless sway output to the phone's own 1080x2424
//! and exports `IRIS_SCALE=2.55`, so this draws at the density Iris's
//! phone reports (`ai_app::ui::fixture::PHONE_SCALE`) rather than the
//! desktop's 1.0 -- same screen, same fixture and the same folding as
//! the Android bench and the headless tests, so what differs between a
//! screenshot here and one from the phone is the renderer, never the
//! data.
//!
//! `--message TEXT` (through `RUN_HEADLESS_ARGS`) starts with that text
//! already in the composer, `\n` for a newline -- the composer's grown
//! and overflowing states are otherwise unreachable here, since this
//! window has no keyboard to type into (UI_RULES.md's "check the states
//! you can't see by default"). `--typed TEXT` *enters* the same text
//! instead, one character per 100ms: laying the composer out from
//! scratch and growing one already on screen are different cases, and
//! only the second reproduced the caret landing in the bar's padding
//! (IRIS.md, 2026-09-08).
//!
//! No server: `transcript-fixture` embeds the transcript. Colour,
//! spacing, type and anything a person has to *see* is answered here;
//! anything with an assertion behind it belongs in `tests/
//! phone_screen.rs` one layer down.

use iris::prelude::*;
use winit::{dpi::PhysicalSize, window::WindowAttributes};

/// The `--ime PX` argument: the bottom inset a keyboard would report,
/// applied after the first frame the way Android's `on_insets_changed`
/// does. The composer's keyboard-open layout is otherwise unreachable
/// here, and it is where its mask went wrong before (see
/// `ActiveData::own_mask`).
fn ime_argv() -> Option<f32> {
    let mut args = std::env::args().skip(1);
    while let Some(arg) = args.next() {
        if arg == "--ime" {
            return args.next()?.parse().ok();
        }
    }
    None
}

/// The `--message TEXT` argument, with `\n` taken as a newline so a
/// multi-line message survives one shell word.
fn message_argv() -> Option<String> {
    let mut args = std::env::args().skip(1);
    while let Some(arg) = args.next() {
        if arg == "--message" {
            return Some(args.next()?.replace("\\n", "\n"));
        }
    }
    None
}

/// The `--typed TEXT` argument: the same text as `--message`, but
/// *entered* rather than preloaded -- one insertion per 100ms, into a
/// focused field, the way a person types. The two are different cases
/// for layout: `--message` is laid out from scratch on the first frame,
/// while this grows an already-drawn composer, which is the path
/// Iris's 2026-09-08 phone report is about.
fn typed_argv() -> Option<String> {
    let mut args = std::env::args().skip(1);
    while let Some(arg) = args.next() {
        if arg == "--typed" {
            return Some(args.next()?.replace("\\n", "\n"));
        }
    }
    None
}

fn main() {
    DefaultApp::<Client>::run();
}

#[derive(DefaultUiState)]
pub struct Client {
    ui_state: DefaultUiState,
    #[allow(dead_code)]
    screen: Option<ai_app::ui::TranscriptScreen>,
}

impl DefaultAppState for Client {
    fn window_attributes() -> WindowAttributes {
        WindowAttributes::default()
            .with_title("iris transcript (bench fixture)")
            .with_inner_size(PhysicalSize::new(
                ai_app::ui::fixture::PHONE_WIDTH,
                ai_app::ui::fixture::PHONE_HEIGHT,
            ))
    }

    fn new(
        mut ui_state: DefaultUiState,
        rsc: &mut DefaultRsc<Self>,
        _: Proxy<Self::Event>,
    ) -> Self {
        let screen = match ai_app::ui::fixture::open(rsc, &mut ui_state) {
            Ok(opened) => {
                if let Some(message) = message_argv() {
                    opened.screen.composer.field.edit(rsc).set(&message);
                }
                if let Some(text) = typed_argv() {
                    let field = opened.screen.composer.field;
                    let redraw = rsc.tasks.redraw_handle();
                    rsc.spawn_task(async move |mut ctx| {
                        for ch in text.chars() {
                            tokio::time::sleep(std::time::Duration::from_millis(100)).await;
                            ctx.update(move |state: &mut Client, rsc| {
                                state.set_focus(Some(field));
                                let end = rsc[field].text().len();
                                let mut edit = field.edit(rsc);
                                if edit.text.caret().is_none() {
                                    edit.set_cursor_byte(end);
                                }
                                edit.insert(&ch.to_string());
                            });
                            redraw.request_redraw();
                        }
                    });
                }
                if let Some(inset) = ime_argv() {
                    opened.screen.composer.set_bottom_inset(rsc, inset);
                }
                Some(opened.screen)
            }
            // On screen rather than a panic: this window exists to be
            // looked at, and "the fixture stopped folding" is something
            // to read, not a process that vanished (UI_RULES.md).
            Err(message) => {
                let text = wtext(format!("Couldn't fold the bench fixture: {message}"))
                    .color(Color::WHITE)
                    .wrap(true)
                    .pad(dp(16))
                    .add_strong(rsc)
                    .any();
                ui_state.set_root(text);
                None
            }
        };
        Self { ui_state, screen }
    }
}