// JSONL replay file loader for test-client.
// Each line is a JSON array of PlayerInput for one tick.
// Empty array = idle tick (no input sent).

use settled_reach_server::bridge::types::PlayerInput;
use std::path::Path;

/// Load a JSONL replay file. Returns one Vec<PlayerInput> per tick.
pub fn load_replay(path: &Path) -> Result<Vec<Vec<PlayerInput>>, String> {
    let content = std::fs::read_to_string(path)
        .map_err(|e| format!("failed to read replay file {}: {}", path.display(), e))?;

    let mut ticks = Vec::new();
    for (i, line) in content.lines().enumerate() {
        let line = line.trim();
        if line.is_empty() {
            continue;
        }
        let inputs: Vec<PlayerInput> =
            serde_json::from_str(line).map_err(|e| format!("replay line {}: {}", i + 1, e))?;
        ticks.push(inputs);
    }
    Ok(ticks)
}