use std::fs;
use std::io::{BufRead, BufReader};
use std::process::{Child, Command, Stdio};
use std::time::{Duration, Instant};

const ANVIL_PK0: &str = "0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80";
const ANVIL_PK1: &str = "0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d";

fn env_required(key: &str) -> Option<String> {
    std::env::var(key)
        .ok()
        .map(|v| v.trim().to_string())
        .filter(|v| !v.is_empty())
}

fn looks_drm(value: &str) -> bool {
    let value = value.to_lowercase();
    value.contains("drm")
        || value.contains("encrypted")
        || value.contains("protected")
        || value.contains("copy")
        || value.contains("widevine")
}

fn autodiscover_hdhr_host_and_channel() -> Option<(String, String)> {
    let devices = ec_hdhomerun::discover().ok()?;
    let device = devices.into_iter().next()?;
    let lineup = ec_hdhomerun::fetch_lineup(&device).ok()?;
    let entry = lineup.iter().find(|e| {
        let tag_drm = e.tags.iter().any(|t| looks_drm(t));
        let raw_drm = e
            .raw
            .as_object()
            .map(|obj| {
                obj.iter()
                    .any(|(k, v)| looks_drm(k) || looks_drm(&v.to_string()))
            })
            .unwrap_or(false);
        !tag_drm && !raw_drm && e.channel.number.as_deref().unwrap_or("").trim() != ""
    })?;
    let host = device.ip.clone();
    let channel = entry
        .channel
        .number
        .clone()
        .or_else(|| Some(entry.channel.name.clone()))
        .unwrap_or_else(|| "2.1".to_string());
    Some((host, channel))
}

fn ec_node_path() -> std::path::PathBuf {
    if let Ok(value) = std::env::var("EC_NODE_BIN") {
        return value.into();
    }
    if let Ok(value) = std::env::var("CARGO_BIN_EXE_ec_node") {
        return value.into();
    }
    if let Ok(value) = std::env::var("CARGO_BIN_EXE_ec-node") {
        return value.into();
    }
    let exe = std::env::current_exe().expect("current_exe");
    let debug_dir = exe
        .parent()
        .and_then(|p| p.parent())
        .expect("expected target/debug/deps");
    debug_dir.join("ec-node")
}

fn repo_root() -> std::path::PathBuf {
    std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
        .parent()
        .and_then(|p| p.parent())
        .expect("workspace root")
        .to_path_buf()
}

fn require_tools() -> bool {
    ["anvil", "cast", "forge", "ffmpeg"]
        .into_iter()
        .all(|tool| which::which(tool).is_ok())
}

fn wait_for_anvil(rpc_url: &str) {
    let deadline = Instant::now() + Duration::from_secs(20);
    while Instant::now() < deadline {
        let status = Command::new("cast")
            .arg("block-number")
            .arg("--rpc-url")
            .arg(rpc_url)
            .stdout(Stdio::null())
            .stderr(Stdio::null())
            .status();
        if matches!(status, Ok(status) if status.success()) {
            return;
        }
        std::thread::sleep(Duration::from_millis(250));
    }
    panic!("anvil did not become ready");
}

struct ChildGuard {
    child: Option<Child>,
}

impl ChildGuard {
    fn new(child: Child) -> Self {
        Self { child: Some(child) }
    }
}

impl Drop for ChildGuard {
    fn drop(&mut self) {
        if let Some(child) = self.child.as_mut() {
            let _ = child.kill();
            let _ = child.wait();
        }
    }
}

fn parse_field(line: &str, field: &str) -> Option<String> {
    let prefix = format!("{field}=");
    line.split_whitespace()
        .find_map(|part| part.strip_prefix(&prefix).map(|value| value.to_string()))
}

#[test]
#[ignore]
fn e2e_hdhr_manifest_observation_finalizes_on_anvil() {
    if !require_tools() {
        return;
    }

    let host = env_required("EVERY_CHANNEL_E2E_HDHR_HOST");
    let channel = env_required("EVERY_CHANNEL_E2E_HDHR_CHANNEL");
    let (host, channel) = match (host, channel) {
        (Some(host), Some(channel)) => (host, channel),
        _ => match autodiscover_hdhr_host_and_channel() {
            Some(v) => v,
            None => return,
        },
    };

    let ts = std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap_or_default()
        .as_millis();
    let tmp = std::env::temp_dir().join(format!("ec-e2e-hdhr-chain-{ts}"));
    fs::create_dir_all(&tmp).unwrap();
    let port = 18_545 + (ts % 10_000) as u16;
    let rpc_url = format!("http://127.0.0.1:{port}");
    let anvil_log = fs::File::create(tmp.join("anvil.log")).unwrap();
    let _anvil = ChildGuard::new(
        Command::new("anvil")
            .arg("--port")
            .arg(port.to_string())
            .stdout(anvil_log)
            .stderr(Stdio::null())
            .spawn()
            .expect("failed to spawn anvil"),
    );

    wait_for_anvil(&rpc_url);

    let owner_file = tmp.join("owner.key");
    fs::write(&owner_file, ANVIL_PK0).unwrap();
    let deploy_json = tmp.join("observation-ledger-deploy.json");
    let deploy = Command::new(repo_root().join("scripts/op-stack/deploy-observation-ledger.sh"))
        .current_dir(repo_root())
        .env("EVERY_CHANNEL_RPC_URL", &rpc_url)
        .env("EVERY_CHANNEL_PRIVATE_KEY_FILE", &owner_file)
        .env("EVERY_CHANNEL_OBSERVATION_QUORUM", "1")
        .env("EVERY_CHANNEL_OBSERVATION_DEPLOY_OUT", &deploy_json)
        .stdout(Stdio::null())
        .stderr(Stdio::inherit())
        .status()
        .expect("failed to deploy observation ledger");
    assert!(deploy.success(), "deploy failed with {deploy}");

    let deploy_value: serde_json::Value =
        serde_json::from_slice(&fs::read(&deploy_json).unwrap()).unwrap();
    let registry = deploy_value["registry"].as_str().unwrap();
    let ledger = deploy_value["ledger"].as_str().unwrap();

    let witness = Command::new("cast")
        .arg("wallet")
        .arg("address")
        .arg("--private-key")
        .arg(ANVIL_PK1)
        .output()
        .expect("failed to derive witness address");
    assert!(witness.status.success());
    let witness = String::from_utf8(witness.stdout).unwrap();
    let witness = witness.trim();

    let add_witness = Command::new("cast")
        .arg("send")
        .arg(registry)
        .arg("addWitness(address)")
        .arg(witness)
        .arg("--rpc-url")
        .arg(&rpc_url)
        .arg("--private-key")
        .arg(ANVIL_PK0)
        .stdout(Stdio::null())
        .stderr(Stdio::inherit())
        .status()
        .expect("failed to add witness");
    assert!(
        add_witness.success(),
        "add witness failed with {add_witness}"
    );

    let ec_node = ec_node_path();
    let broadcast_name = format!("every.channel/e2e/blockchain/{ts}");
    let mut publisher = Command::new(&ec_node);
    publisher
        .env("EVERY_CHANNEL_MANIFEST_SIGNING_KEY", "11".repeat(32))
        .arg("moq-publish")
        .arg("--publish-manifests")
        .arg("--epoch-chunks")
        .arg("1")
        .arg("--max-chunks")
        .arg("1")
        .arg("--chunk-ms")
        .arg("2000")
        .arg("--broadcast-name")
        .arg(&broadcast_name)
        .arg("--observation-rpc-url")
        .arg(&rpc_url)
        .arg("--observation-ledger")
        .arg(ledger)
        .arg("--observation-private-key")
        .arg(ANVIL_PK1)
        .arg("--chunk-dir")
        .arg(tmp.join("chunks"))
        .arg("hdhr")
        .arg("--host")
        .arg(&host)
        .arg("--channel")
        .arg(&channel)
        .stdout(Stdio::null())
        .stderr(Stdio::piped());

    let mut child = publisher.spawn().expect("failed to spawn publisher");
    let stderr = child.stderr.take().expect("publisher stderr missing");
    let lines = BufReader::new(stderr)
        .lines()
        .filter_map(|line| line.ok())
        .collect::<Vec<_>>();
    let status = child.wait().expect("failed to wait for publisher");
    assert!(
        status.success(),
        "publisher exited with {status}: {lines:?}"
    );

    let observation_line = lines
        .iter()
        .find(|line| line.starts_with("observation submitted:"))
        .expect("publisher did not submit an observation");
    let observation_hash = parse_field(observation_line, "observation_hash").unwrap();
    let slot_hash = parse_field(observation_line, "slot_hash").unwrap();

    let finalized = Command::new("cast")
        .arg("call")
        .arg(ledger)
        .arg("finalizedObservationBySlot(bytes32)(bytes32)")
        .arg(slot_hash)
        .arg("--rpc-url")
        .arg(&rpc_url)
        .output()
        .expect("failed to read finalized slot");
    assert!(finalized.status.success());
    let finalized = String::from_utf8(finalized.stdout).unwrap();
    assert_eq!(finalized.trim(), observation_hash);
}