use std::fs::File;
use std::io::Read;
use std::path::PathBuf;
use crate::config::Monitor;

pub fn is_lid_closed(monitor: &Monitor) -> bool {
    if let Some(lid) = &monitor.lid {
        is_acpi_closed(lid)
    } else {
        false
    }
}

/// Determine if the lid is closed.
/// lid is the name of a directory in /proc/acpi/button/lid/.
fn is_acpi_closed(lid: &String) -> bool {
    let mut path_buf = PathBuf::from("/proc/acpi/button/lid");
    path_buf.push(&lid);
    path_buf.push("state");

    if let Ok(ok) = path_buf.try_exists() {
        if ok {
            File::open(path_buf).is_ok_and(|mut file| {
                let mut str = String::new();
                if let Ok(_size) = file.read_to_string(&mut str) {
                    is_state_closed(str)
                } else {
                    // error reading file
                    false
                }
            })
        } else {
            // no file
            false
        }
    } else {
        // error checking for file
        false
    }
}

/// Parse a /proc/acpi/button/lid/*/state file and return true if the lid is closed
fn is_state_closed(str:String) -> bool {
    str.contains("closed")
}