//! Include-based coverage for microphone source-selection helpers.
//!
//! Scope: include `client/src/input/microphone.rs` and exercise Pulse source
//! parsing + fallback behavior without requiring a live audio stack.
//! Targets: `client/src/input/microphone.rs`.
//! Why: source selection regressions should be caught with deterministic tests.

#[allow(warnings)]
mod microphone_include_contract {
    include!(env!("LESAVKA_CLIENT_MICROPHONE_SRC"));

    use serial_test::serial;
    use std::fs;
    use std::os::unix::fs::PermissionsExt;
    use std::path::Path;
    use temp_env::with_var;
    use tempfile::tempdir;

    fn write_executable(dir: &Path, name: &str, body: &str) {
        let path = dir.join(name);
        fs::write(&path, body).expect("write script");
        let mut perms = fs::metadata(&path).expect("metadata").permissions();
        perms.set_mode(0o755);
        fs::set_permissions(path, perms).expect("chmod");
    }

    fn with_fake_pactl(script_body: &str, f: impl FnOnce()) {
        let dir = tempdir().expect("tempdir");
        write_executable(dir.path(), "pactl", script_body);
        let prior = std::env::var("PATH").unwrap_or_default();
        let merged = if prior.is_empty() {
            dir.path().display().to_string()
        } else {
            format!("{}:{prior}", dir.path().display())
        };
        with_var("PATH", Some(merged), f);
    }

    #[test]
    #[serial]
    fn pulse_source_by_substr_matches_expected_device_name() {
        let script = r#"#!/usr/bin/env sh
if [ "$1" = "list" ] && [ "$2" = "short" ] && [ "$3" = "sources" ]; then
  echo "0 alsa_input.pci.monitor module-alsa-card.c s16le 2ch 48000Hz RUNNING"
  echo "1 alsa_input.usb-Mic_1234-00.analog-stereo module-alsa-card.c s16le 2ch 48000Hz IDLE"
  exit 0
fi
exit 0
"#;
        with_fake_pactl(script, || {
            let src = MicrophoneCapture::pulse_source_by_substr("Mic_1234")
                .expect("matching source");
            assert_eq!(src, "alsa_input.usb-Mic_1234-00.analog-stereo");
        });
    }

    #[test]
    #[serial]
    fn default_source_arg_prefers_non_monitor_source() {
        let script = r#"#!/usr/bin/env sh
if [ "$1" = "list" ] && [ "$2" = "short" ] && [ "$3" = "sources" ]; then
  echo "0 alsa_input.pci.monitor module-alsa-card.c s16le 2ch 48000Hz RUNNING"
  echo "1 alsa_input.usb-DeskMic_5678-00.analog-stereo module-alsa-card.c s16le 2ch 48000Hz IDLE"
  exit 0
fi
exit 0
"#;
        with_fake_pactl(script, || {
            let arg = MicrophoneCapture::default_source_arg();
            assert!(
                arg.contains("device=alsa_input.usb-DeskMic_5678-00.analog-stereo"),
                "expected escaped non-monitor source argument"
            );
        });
    }

    #[test]
    #[serial]
    fn default_source_arg_returns_empty_when_pactl_is_unavailable() {
        with_var("PATH", Some("/definitely/missing/path"), || {
            let arg = MicrophoneCapture::default_source_arg();
            assert!(arg.is_empty());
        });
    }

    #[test]
    fn pull_returns_none_for_empty_appsink() {
        gst::init().ok();
        let sink: gst_app::AppSink = gst::ElementFactory::make("appsink")
            .build()
            .expect("appsink")
            .downcast::<gst_app::AppSink>()
            .expect("appsink cast");
        let cap = MicrophoneCapture {
            pipeline: gst::Pipeline::new(),
            sink,
        };
        assert!(cap.pull().is_none(), "empty appsink should produce no packet");
    }

    #[test]
    fn pull_returns_packet_when_appsink_has_buffered_sample() {
        gst::init().ok();
        let pipeline = gst::Pipeline::new();
        let src = gst::ElementFactory::make("appsrc")
            .build()
            .expect("appsrc")
            .downcast::<gst_app::AppSrc>()
            .expect("appsrc cast");
        let sink = gst::ElementFactory::make("appsink")
            .property("emit-signals", false)
            .property("sync", false)
            .build()
            .expect("appsink")
            .downcast::<gst_app::AppSink>()
            .expect("appsink cast");
        pipeline
            .add_many([
                src.upcast_ref::<gst::Element>(),
                sink.upcast_ref::<gst::Element>(),
            ])
            .expect("add appsrc/appsink");
        src.link(&sink).expect("link appsrc->appsink");
        pipeline.set_state(gst::State::Playing).ok();

        let mut buf = gst::Buffer::from_slice(vec![1_u8, 2, 3, 4]);
        buf.get_mut()
            .expect("buffer mut")
            .set_pts(Some(gst::ClockTime::from_useconds(321)));
        src.push_buffer(buf).expect("push sample");

        let cap = MicrophoneCapture { pipeline, sink };
        let pkt = cap.pull().expect("audio packet");
        assert_eq!(pkt.id, 0);
        assert_eq!(pkt.pts, 321);
        assert_eq!(pkt.data, vec![1, 2, 3, 4]);
    }

    #[test]
    #[serial]
    fn new_uses_requested_source_fragment_when_available() {
        let script = r#"#!/usr/bin/env sh
if [ "$1" = "list" ] && [ "$2" = "short" ] && [ "$3" = "sources" ]; then
  echo "1 alsa_input.usb-LavMic_abc-00.analog-stereo module-alsa-card.c s16le 2ch 48000Hz RUNNING"
  exit 0
fi
exit 0
"#;
        with_fake_pactl(script, || {
            with_var("LESAVKA_MIC_SOURCE", Some("LavMic_abc"), || {
                let result = MicrophoneCapture::new();
                if let Err(err) = result {
                    assert!(!err.to_string().trim().is_empty());
                }
            });
        });
    }

    #[test]
    #[serial]
    fn new_falls_back_to_default_source_when_requested_fragment_is_missing() {
        let script = r#"#!/usr/bin/env sh
if [ "$1" = "list" ] && [ "$2" = "short" ] && [ "$3" = "sources" ]; then
  echo "0 alsa_input.pci.monitor module-alsa-card.c s16le 2ch 48000Hz RUNNING"
  echo "1 alsa_input.usb-DeskMic_777-00.analog-stereo module-alsa-card.c s16le 2ch 48000Hz IDLE"
  exit 0
fi
exit 0
"#;
        with_fake_pactl(script, || {
            with_var("LESAVKA_MIC_SOURCE", Some("missing-fragment"), || {
                let result = MicrophoneCapture::new();
                if let Err(err) = result {
                    assert!(!err.to_string().trim().is_empty());
                }
            });
        });
    }
}