use bat_adapters::official::game_main_config::YostarJpGameMainConfig;
use bat_adapters::official::inventory::{
    YostarJpPlatformCatalogInventory, YostarJpPlatformDownloadInventory,
};
use bat_adapters::official::yostar_jp::{
    server_info_url, PatchPlatform, YostarJpResourceDiscoveryPlan, YostarJpResourceEndpoint,
    YostarJpResourceEndpointKind, YostarJpServerInfo, YostarJpSyncSnapshot,
};
use bat_infrastructure::{
    build_official_pull_plan_for_platform_inventory, build_official_sync_plan,
    changed_endpoint_urls, default_official_platforms, OfficialGameMainConfigBootstrapService,
    OfficialLauncherBootstrapService, OfficialResourcePullPlan, OfficialResourcePullService,
    YostarJpLauncherGameConfig, YostarJpLauncherManifestUrl, YostarJpLauncherRemoteManifest,
};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::env;
use std::fs;
use std::path::{Path, PathBuf};

const OFFICIAL_UPDATE_SNAPSHOT_VERSION: u32 = 2;
const OFFICIAL_BOOTSTRAP_CACHE_VERSION: u32 = 1;

#[derive(Debug)]
struct CliArgs {
    server_info_source: Option<ServerInfoSource>,
    connection_group: Option<String>,
    app_version: Option<String>,
    launcher_version: String,
    auto_discover: bool,
    platforms: Option<Vec<PatchPlatform>>,
    output_root: PathBuf,
    snapshot_path: Option<PathBuf>,
    curl_command: PathBuf,
    dry_run: bool,
    plan: bool,
    force: bool,
    audit_local: bool,
    repair: bool,
}

#[derive(Debug)]
enum ServerInfoSource {
    LocalPath(PathBuf),
    OfficialFile(String),
    OfficialUrl(String),
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
struct OfficialUpdateSnapshot {
    #[serde(default = "default_update_snapshot_version")]
    snapshot_version: u32,
    connection_group_name: String,
    app_version: String,
    bundle_version: Option<String>,
    addressables_root: String,
    endpoints: Vec<YostarJpResourceEndpoint>,
    #[serde(default)]
    endpoint_markers: Vec<OfficialEndpointMarkerSnapshot>,
    #[serde(default)]
    launcher_metadata: Option<LauncherMetadataSnapshot>,
    #[serde(default)]
    game_main_config_bootstrap: Option<GameMainConfigSnapshot>,
}

impl OfficialUpdateSnapshot {
    fn new(
        base: YostarJpSyncSnapshot,
        endpoint_markers: Vec<OfficialEndpointMarkerSnapshot>,
        bootstrap: Option<&ResolvedBootstrap>,
    ) -> Self {
        Self {
            snapshot_version: OFFICIAL_UPDATE_SNAPSHOT_VERSION,
            connection_group_name: base.connection_group_name,
            app_version: base.app_version,
            bundle_version: base.bundle_version,
            addressables_root: base.addressables_root,
            endpoints: base.endpoints,
            endpoint_markers,
            launcher_metadata: bootstrap.map(|bootstrap| bootstrap.launcher_metadata.clone()),
            game_main_config_bootstrap: bootstrap
                .map(|bootstrap| bootstrap.game_main_config.clone()),
        }
    }

    fn base_snapshot(&self) -> YostarJpSyncSnapshot {
        YostarJpSyncSnapshot {
            connection_group_name: self.connection_group_name.clone(),
            app_version: self.app_version.clone(),
            bundle_version: self.bundle_version.clone(),
            addressables_root: self.addressables_root.clone(),
            endpoints: self.endpoints.clone(),
        }
    }

    fn addressables_marker_checked_count(&self) -> usize {
        self.endpoint_markers
            .iter()
            .filter(|marker| marker.role == OfficialEndpointMarkerRole::AddressablesCatalogMarker)
            .count()
    }

    fn unverified_marker_count(&self) -> usize {
        self.addressables_marker_checked_count()
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
struct OfficialEndpointMarkerSnapshot {
    kind: YostarJpResourceEndpointKind,
    platform: Option<PatchPlatform>,
    url: String,
    role: OfficialEndpointMarkerRole,
    value: String,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
enum OfficialEndpointMarkerRole {
    OfficialSeedHash,
    AddressablesCatalogMarker,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
struct LauncherMetadataSnapshot {
    launcher_version: String,
    game_latest_version: String,
    game_latest_file_path: String,
    game_lowest_version: Option<String>,
    game_start_exe_name: Option<String>,
    game_start_params: Vec<String>,
    manifest_url: String,
    manifest_source: Option<String>,
    manifest_file_count: usize,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
struct GameMainConfigSnapshot {
    server_info_data_url: Option<String>,
    default_connection_group: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
struct OfficialBootstrapCache {
    #[serde(default = "default_bootstrap_cache_version")]
    cache_version: u32,
    launcher_metadata: LauncherMetadataSnapshot,
    game_main_config: GameMainConfigSnapshot,
}

#[derive(Debug, Clone)]
struct ResolvedBootstrap {
    launcher_metadata: LauncherMetadataSnapshot,
    game_main_config: GameMainConfigSnapshot,
    cache_hit: bool,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct ExtendedSnapshotDelta {
    endpoint_markers_changed: bool,
    launcher_metadata_changed: bool,
    game_main_config_changed: bool,
}

impl ExtendedSnapshotDelta {
    fn has_changes(self) -> bool {
        self.endpoint_markers_changed
            || self.launcher_metadata_changed
            || self.game_main_config_changed
    }
}

fn main() -> anyhow::Result<()> {
    let args = parse_args()?;
    let default_platforms = default_official_platforms();
    let platforms = args
        .platforms
        .as_deref()
        .unwrap_or(default_platforms.as_slice());
    let fetcher =
        OfficialResourcePullService::with_curl_command(&args.output_root, &args.curl_command);
    let snapshot_path = args
        .snapshot_path
        .clone()
        .unwrap_or_else(|| args.output_root.join("official-sync-snapshot.json"));
    let bootstrap_cache_path = args.output_root.join("official-bootstrap-cache.json");

    let bootstrap = if args.auto_discover {
        Some(resolve_bootstrap(
            &args.launcher_version,
            &args.curl_command,
            &bootstrap_cache_path,
            !args.dry_run,
        )?)
    } else {
        None
    };

    let app_version = args
        .app_version
        .clone()
        .or_else(|| {
            bootstrap
                .as_ref()
                .map(|bootstrap| bootstrap.launcher_metadata.game_latest_version.clone())
        })
        .ok_or_else(|| {
            anyhow::anyhow!("missing --app-version; pass it explicitly or use --auto-discover")
        })?;
    let connection_group = args
        .connection_group
        .clone()
        .or_else(|| {
            bootstrap
                .as_ref()
                .and_then(|bootstrap| bootstrap.game_main_config.default_connection_group.clone())
        })
        .ok_or_else(|| {
            anyhow::anyhow!("missing --connection-group; pass it explicitly or use --auto-discover")
        })?;

    let server_info_bytes = if let Some(source) = args.server_info_source.as_ref() {
        load_server_info(source, &fetcher)?
    } else {
        let bootstrap = bootstrap.as_ref().ok_or_else(|| {
            anyhow::anyhow!("missing server-info source; pass --server-info-url, --server-info-file, --server-info-path, or use --auto-discover")
        })?;
        let url = bootstrap
            .game_main_config
            .server_info_data_url
            .as_deref()
            .ok_or_else(|| anyhow::anyhow!("official GameMainConfig has no ServerInfoDataUrl"))?;
        fetcher.fetch_bytes(url).map_err(anyhow::Error::msg)?
    };

    let server_info = YostarJpServerInfo::from_slice(&server_info_bytes)?;
    let current_snapshot = server_info
        .sync_snapshot(&connection_group, &app_version, platforms)
        .map_err(anyhow::Error::msg)?;
    let endpoint_markers = collect_endpoint_markers(&fetcher, &current_snapshot)?;
    let current_update_snapshot = OfficialUpdateSnapshot::new(
        current_snapshot.clone(),
        endpoint_markers,
        bootstrap.as_ref(),
    );
    let previous_snapshot = read_snapshot(&snapshot_path)?;
    let previous_base_snapshot = previous_snapshot
        .as_ref()
        .map(OfficialUpdateSnapshot::base_snapshot);
    let sync_plan =
        build_official_sync_plan(current_snapshot.clone(), previous_base_snapshot.as_ref());
    let extended_delta =
        diff_extended_snapshot(&current_update_snapshot, previous_snapshot.as_ref());
    let changed_urls = changed_endpoint_urls(&sync_plan.delta);
    let remote_should_download =
        args.force || sync_plan.should_download() || extended_delta.has_changes();
    let pull_plan = if args.audit_local || remote_should_download || args.plan {
        Some(build_pull_plan(
            &server_info,
            &connection_group,
            &app_version,
            platforms,
            &fetcher,
        )?)
    } else {
        None
    };
    let local_audit = if args.audit_local {
        Some(
            fetcher
                .audit_local_manifest(
                    pull_plan
                        .as_ref()
                        .ok_or_else(|| anyhow::anyhow!("local audit requires a pull plan"))?,
                )
                .map_err(anyhow::Error::msg)?,
        )
    } else {
        None
    };
    let repair_needed = args.repair
        && local_audit
            .as_ref()
            .map(|audit| !audit.is_clean())
            .unwrap_or(false);
    let should_download = remote_should_download || repair_needed;

    println!(
        "connection_group={}",
        current_snapshot.connection_group_name
    );
    println!("app_version={}", current_snapshot.app_version);
    println!(
        "bundle_version={}",
        current_snapshot
            .bundle_version
            .as_deref()
            .unwrap_or("<none>")
    );
    println!("addressables_root={}", current_snapshot.addressables_root);
    println!("platforms={:?}", platforms);
    println!("snapshot_path={}", snapshot_path.display());
    println!(
        "previous_snapshot={}",
        if previous_snapshot.is_some() {
            "present"
        } else {
            "missing"
        }
    );
    println!("decision={:?}", sync_plan.decision);
    println!("force={}", args.force);
    println!("audit_local={}", args.audit_local);
    println!("repair={}", args.repair);
    println!("should_download={}", should_download);
    println!("is_initial={}", sync_plan.delta.is_initial);
    println!("changed_endpoint_count={}", changed_urls.len());
    for url in &changed_urls {
        println!("changed_endpoint_url={url}");
    }
    println!(
        "endpoint_markers_changed={}",
        extended_delta.endpoint_markers_changed
    );
    println!(
        "launcher_metadata_changed={}",
        extended_delta.launcher_metadata_changed
    );
    println!(
        "game_main_config_changed={}",
        extended_delta.game_main_config_changed
    );
    println!(
        "addressables_marker_checked_count={}",
        current_update_snapshot.addressables_marker_checked_count()
    );
    println!(
        "unverified_marker_count={}",
        current_update_snapshot.unverified_marker_count()
    );
    if let Some(bootstrap) = bootstrap.as_ref() {
        println!("bootstrap_cache_hit={}", bootstrap.cache_hit);
        println!("bootstrap_cache_path={}", bootstrap_cache_path.display());
    }
    if let Some(audit) = local_audit.as_ref() {
        println!("local_manifest_verified_count={}", audit.verified_count());
        println!(
            "local_manifest_repair_needed_count={}",
            audit.repair_needed_count()
        );
    } else {
        println!("local_manifest_verified_count=0");
        println!("local_manifest_repair_needed_count=0");
    }

    if !should_download {
        println!("official_seed_hash_verified_count=0");
        println!("update_status=up_to_date");
        return Ok(());
    }

    println!("dry_run={}", args.dry_run);

    if args.dry_run {
        if args.plan {
            let pull_plan = pull_plan
                .as_ref()
                .ok_or_else(|| anyhow::anyhow!("dry-run plan requested but no pull plan exists"))?;
            let all_urls = pull_plan.all_urls().map_err(anyhow::Error::msg)?;
            println!("download_url_count={}", all_urls.len());
            for url in &all_urls {
                println!("{url}");
            }
        }
        println!("official_seed_hash_verified_count=0");
        println!("update_status=would_download");
        return Ok(());
    }

    let pull_plan = pull_plan
        .as_ref()
        .ok_or_else(|| anyhow::anyhow!("download requested but no pull plan exists"))?;
    let report = fetcher.pull(pull_plan).map_err(anyhow::Error::msg)?;
    let final_audit = fetcher
        .audit_local_manifest(pull_plan)
        .map_err(anyhow::Error::msg)?;
    write_snapshot(&snapshot_path, &current_update_snapshot)?;

    println!("update_status=downloaded");
    println!("resource_count={}", report.items.len());
    println!("downloaded_count={}", report.downloaded_count());
    println!("resumed_count={}", report.resumed_count());
    println!("skipped_count={}", report.skipped_count());
    println!("final_bytes={}", report.total_bytes());
    println!("transferred_bytes={}", report.transferred_bytes());
    println!(
        "official_seed_hash_verified_count={}",
        report.official_hash_verified_count()
    );
    println!(
        "local_manifest_verified_count={}",
        final_audit.verified_count()
    );
    println!(
        "local_manifest_repair_needed_count={}",
        final_audit.repair_needed_count()
    );
    println!(
        "addressables_marker_checked_count={}",
        current_update_snapshot.addressables_marker_checked_count()
    );
    println!(
        "unverified_marker_count={}",
        current_update_snapshot.unverified_marker_count()
    );
    println!(
        "download_manifest={}",
        fetcher.download_manifest_path().display()
    );
    println!("snapshot_written={}", snapshot_path.display());

    Ok(())
}

fn build_pull_plan(
    server_info: &YostarJpServerInfo,
    connection_group: &str,
    app_version: &str,
    platforms: &[PatchPlatform],
    fetcher: &OfficialResourcePullService,
) -> anyhow::Result<OfficialResourcePullPlan> {
    let discovery = server_info
        .discovery_plan(connection_group, app_version, platforms)
        .map_err(anyhow::Error::msg)?;
    let seed_catalogs = fetch_seed_catalogs(fetcher, &discovery)?;
    let inventory = build_inventory_from_seed_catalogs(&seed_catalogs, platforms)?;
    Ok(build_official_pull_plan_for_platform_inventory(
        discovery, inventory, platforms,
    ))
}

fn load_server_info(
    source: &ServerInfoSource,
    fetcher: &OfficialResourcePullService,
) -> anyhow::Result<Vec<u8>> {
    match source {
        ServerInfoSource::LocalPath(path) => Ok(fs::read(path)?),
        ServerInfoSource::OfficialFile(file_name) => {
            let url = server_info_url(file_name).map_err(anyhow::Error::msg)?;
            fetcher.fetch_bytes(&url).map_err(anyhow::Error::msg)
        }
        ServerInfoSource::OfficialUrl(url) => fetcher.fetch_bytes(url).map_err(anyhow::Error::msg),
    }
}

fn default_update_snapshot_version() -> u32 {
    OFFICIAL_UPDATE_SNAPSHOT_VERSION
}

fn default_bootstrap_cache_version() -> u32 {
    OFFICIAL_BOOTSTRAP_CACHE_VERSION
}

fn collect_endpoint_markers(
    fetcher: &OfficialResourcePullService,
    snapshot: &YostarJpSyncSnapshot,
) -> anyhow::Result<Vec<OfficialEndpointMarkerSnapshot>> {
    let mut markers = Vec::new();

    for endpoint in &snapshot.endpoints {
        let Some(role) = marker_role(endpoint.kind) else {
            continue;
        };
        let bytes = fetcher
            .fetch_bytes(&endpoint.url)
            .map_err(anyhow::Error::msg)?;
        let value = String::from_utf8_lossy(&bytes).trim().to_string();
        markers.push(OfficialEndpointMarkerSnapshot {
            kind: endpoint.kind,
            platform: endpoint.platform,
            url: endpoint.url.clone(),
            role,
            value,
        });
    }

    Ok(markers)
}

fn marker_role(kind: YostarJpResourceEndpointKind) -> Option<OfficialEndpointMarkerRole> {
    match kind {
        YostarJpResourceEndpointKind::TableCatalogHash
        | YostarJpResourceEndpointKind::BundlePackingInfoHash
        | YostarJpResourceEndpointKind::MediaCatalogHash => {
            Some(OfficialEndpointMarkerRole::OfficialSeedHash)
        }
        YostarJpResourceEndpointKind::AddressablesCatalogHash => {
            Some(OfficialEndpointMarkerRole::AddressablesCatalogMarker)
        }
        _ => None,
    }
}

fn diff_extended_snapshot(
    current: &OfficialUpdateSnapshot,
    previous: Option<&OfficialUpdateSnapshot>,
) -> ExtendedSnapshotDelta {
    let Some(previous) = previous else {
        return ExtendedSnapshotDelta {
            endpoint_markers_changed: true,
            launcher_metadata_changed: current.launcher_metadata.is_some(),
            game_main_config_changed: current.game_main_config_bootstrap.is_some(),
        };
    };

    ExtendedSnapshotDelta {
        endpoint_markers_changed: current.endpoint_markers != previous.endpoint_markers,
        launcher_metadata_changed: current.launcher_metadata != previous.launcher_metadata,
        game_main_config_changed: current.game_main_config_bootstrap
            != previous.game_main_config_bootstrap,
    }
}

fn read_snapshot(path: &Path) -> anyhow::Result<Option<OfficialUpdateSnapshot>> {
    if !path.exists() {
        return Ok(None);
    }

    let data = fs::read(path)?;
    match serde_json::from_slice::<OfficialUpdateSnapshot>(&data) {
        Ok(snapshot) => Ok(Some(snapshot)),
        Err(update_error) => {
            let legacy = serde_json::from_slice::<YostarJpSyncSnapshot>(&data).map_err(|legacy_error| {
                anyhow::anyhow!(
                    "failed to parse official update snapshot as v2 ({update_error}) or legacy v1 ({legacy_error})"
                )
            })?;
            Ok(Some(OfficialUpdateSnapshot::new(legacy, Vec::new(), None)))
        }
    }
}

fn write_snapshot(path: &Path, snapshot: &OfficialUpdateSnapshot) -> anyhow::Result<()> {
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent)?;
    }

    let data = serde_json::to_vec_pretty(snapshot)?;
    fs::write(path, data)?;
    Ok(())
}

fn read_bootstrap_cache(path: &Path) -> anyhow::Result<Option<OfficialBootstrapCache>> {
    if !path.exists() {
        return Ok(None);
    }

    let data = fs::read(path)?;
    Ok(Some(serde_json::from_slice(&data)?))
}

fn write_bootstrap_cache(path: &Path, cache: &OfficialBootstrapCache) -> anyhow::Result<()> {
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent)?;
    }

    let data = serde_json::to_vec_pretty(cache)?;
    fs::write(path, data)?;
    Ok(())
}

fn launcher_metadata_from_parts(
    launcher_version: &str,
    game_config: &YostarJpLauncherGameConfig,
    manifest_url: &YostarJpLauncherManifestUrl,
    manifest: &YostarJpLauncherRemoteManifest,
) -> LauncherMetadataSnapshot {
    LauncherMetadataSnapshot {
        launcher_version: launcher_version.to_string(),
        game_latest_version: game_config.game_latest_version.clone(),
        game_latest_file_path: game_config.game_latest_file_path.clone(),
        game_lowest_version: game_config.game_lowest_version.clone(),
        game_start_exe_name: game_config.game_start_exe_name.clone(),
        game_start_params: game_config.game_start_params.clone(),
        manifest_url: manifest_url.url.clone(),
        manifest_source: manifest.source.clone().filter(|value| !value.is_empty()),
        manifest_file_count: manifest.files.len(),
    }
}

fn game_main_config_snapshot(config: &YostarJpGameMainConfig) -> GameMainConfigSnapshot {
    GameMainConfigSnapshot {
        server_info_data_url: config.server_info_data_url.clone(),
        default_connection_group: config.default_connection_group.clone(),
    }
}

fn resolve_bootstrap(
    launcher_version: &str,
    curl_command: &Path,
    cache_path: &Path,
    write_cache: bool,
) -> anyhow::Result<ResolvedBootstrap> {
    let launcher = OfficialLauncherBootstrapService::with_curl_command(
        launcher_version,
        curl_command.to_string_lossy().to_string(),
    );
    let (game_config, manifest_url, manifest) = launcher
        .fetch_latest_remote_manifest()
        .map_err(anyhow::Error::msg)?;
    let launcher_metadata =
        launcher_metadata_from_parts(launcher_version, &game_config, &manifest_url, &manifest);

    if let Some(cache) = read_bootstrap_cache(cache_path)? {
        if let Some(game_main_config) =
            cached_game_main_config_for_metadata(&cache, &launcher_metadata)
        {
            return Ok(ResolvedBootstrap {
                launcher_metadata,
                game_main_config,
                cache_hit: true,
            });
        }
    }

    let bootstrapper = OfficialGameMainConfigBootstrapService::with_commands(
        launcher_version,
        curl_command.to_path_buf(),
        "unzip",
    );
    let bootstrap = bootstrapper.fetch_bootstrap().map_err(anyhow::Error::msg)?;
    let launcher_metadata = LauncherMetadataSnapshot {
        launcher_version: launcher_version.to_string(),
        game_latest_version: bootstrap.game_config.game_latest_version.clone(),
        game_latest_file_path: bootstrap.game_config.game_latest_file_path.clone(),
        game_lowest_version: bootstrap.game_config.game_lowest_version.clone(),
        game_start_exe_name: bootstrap.game_config.game_start_exe_name.clone(),
        game_start_params: bootstrap.game_config.game_start_params.clone(),
        manifest_url: bootstrap.manifest_url.clone(),
        manifest_source: bootstrap.manifest_source.clone(),
        manifest_file_count: bootstrap.manifest_file_count,
    };
    let game_main_config = game_main_config_snapshot(&bootstrap.game_main_config);
    if write_cache {
        write_bootstrap_cache(
            cache_path,
            &OfficialBootstrapCache {
                cache_version: OFFICIAL_BOOTSTRAP_CACHE_VERSION,
                launcher_metadata: launcher_metadata.clone(),
                game_main_config: game_main_config.clone(),
            },
        )?;
    }

    Ok(ResolvedBootstrap {
        launcher_metadata,
        game_main_config,
        cache_hit: false,
    })
}

fn cached_game_main_config_for_metadata(
    cache: &OfficialBootstrapCache,
    launcher_metadata: &LauncherMetadataSnapshot,
) -> Option<GameMainConfigSnapshot> {
    if cache.cache_version == OFFICIAL_BOOTSTRAP_CACHE_VERSION
        && cache.launcher_metadata == *launcher_metadata
    {
        Some(cache.game_main_config.clone())
    } else {
        None
    }
}

fn fetch_seed_catalogs(
    fetcher: &OfficialResourcePullService,
    discovery: &YostarJpResourceDiscoveryPlan,
) -> anyhow::Result<SeedCatalogs> {
    let mut catalogs = SeedCatalogs::default();

    for endpoint in &discovery.endpoints {
        if !matches!(
            endpoint.kind,
            YostarJpResourceEndpointKind::TableCatalog
                | YostarJpResourceEndpointKind::BundlePackingInfo
                | YostarJpResourceEndpointKind::MediaCatalog
        ) {
            continue;
        }

        let bytes = fetcher
            .fetch_bytes(&endpoint.url)
            .map_err(anyhow::Error::msg)?;
        catalogs.insert(endpoint, bytes)?;
    }

    Ok(catalogs)
}

fn build_inventory_from_seed_catalogs(
    catalogs: &SeedCatalogs,
    platforms: &[PatchPlatform],
) -> anyhow::Result<YostarJpPlatformDownloadInventory> {
    let table_catalog = catalogs
        .table_catalog
        .as_deref()
        .ok_or_else(|| anyhow::anyhow!("official discovery did not include TableCatalog.bytes"))?;
    let mut platform_catalogs = Vec::new();

    for platform in platforms {
        let bundle_packing_info = catalogs.bundle_packing_infos.get(platform).ok_or_else(|| {
            anyhow::anyhow!(
                "official discovery did not include {} BundlePackingInfo.bytes",
                platform.as_str()
            )
        })?;
        let media_catalog = catalogs.media_catalogs.get(platform).ok_or_else(|| {
            anyhow::anyhow!(
                "official discovery did not include {} MediaCatalog.bytes",
                platform.as_str()
            )
        })?;

        platform_catalogs.push(YostarJpPlatformCatalogInventory::from_catalog_bytes(
            *platform,
            bundle_packing_info,
            media_catalog,
        ));
    }

    Ok(YostarJpPlatformDownloadInventory::from_catalog_bytes(
        table_catalog,
        platform_catalogs,
    ))
}

#[derive(Debug, Default)]
struct SeedCatalogs {
    table_catalog: Option<Vec<u8>>,
    bundle_packing_infos: HashMap<PatchPlatform, Vec<u8>>,
    media_catalogs: HashMap<PatchPlatform, Vec<u8>>,
}

impl SeedCatalogs {
    fn insert(
        &mut self,
        endpoint: &YostarJpResourceEndpoint,
        bytes: Vec<u8>,
    ) -> anyhow::Result<()> {
        match endpoint.kind {
            YostarJpResourceEndpointKind::TableCatalog => {
                self.table_catalog = Some(bytes);
            }
            YostarJpResourceEndpointKind::BundlePackingInfo => {
                let platform = required_platform(endpoint)?;
                self.bundle_packing_infos.insert(platform, bytes);
            }
            YostarJpResourceEndpointKind::MediaCatalog => {
                let platform = required_platform(endpoint)?;
                self.media_catalogs.insert(platform, bytes);
            }
            _ => {}
        }

        Ok(())
    }
}

fn required_platform(endpoint: &YostarJpResourceEndpoint) -> anyhow::Result<PatchPlatform> {
    endpoint.platform.ok_or_else(|| {
        anyhow::anyhow!(
            "discovery endpoint {:?} has no platform: {}",
            endpoint.kind,
            endpoint.url
        )
    })
}

fn parse_args() -> anyhow::Result<CliArgs> {
    parse_args_from(env::args())
}

fn parse_args_from(raw_args: impl IntoIterator<Item = String>) -> anyhow::Result<CliArgs> {
    let mut args = raw_args.into_iter();
    let binary = args
        .next()
        .unwrap_or_else(|| "official_update_check".to_string());
    let mut parsed = CliArgs {
        server_info_source: None,
        connection_group: None,
        app_version: None,
        launcher_version: "1.7.2".to_string(),
        auto_discover: false,
        platforms: None,
        output_root: PathBuf::from("official_update_output"),
        snapshot_path: None,
        curl_command: PathBuf::from("curl"),
        dry_run: false,
        plan: false,
        force: false,
        audit_local: true,
        repair: true,
    };

    while let Some(flag) = args.next() {
        match flag.as_str() {
            "--auto-discover" => {
                parsed.auto_discover = true;
            }
            "--server-info-url" => {
                parsed.server_info_source = Some(ServerInfoSource::OfficialUrl(next_option_value(
                    &mut args, &flag,
                )?));
            }
            "--server-info-file" => {
                parsed.server_info_source = Some(ServerInfoSource::OfficialFile(
                    next_option_value(&mut args, &flag)?,
                ));
            }
            "--server-info-path" => {
                parsed.server_info_source = Some(ServerInfoSource::LocalPath(PathBuf::from(
                    next_option_value(&mut args, &flag)?,
                )));
            }
            "--connection-group" => {
                parsed.connection_group = Some(next_option_value(&mut args, &flag)?);
            }
            "--app-version" => {
                parsed.app_version = Some(next_option_value(&mut args, &flag)?);
            }
            "--launcher-version" => {
                parsed.launcher_version = next_option_value(&mut args, &flag)?;
            }
            "--platforms" => {
                let value = next_option_value(&mut args, &flag)?;
                parsed.platforms = Some(parse_platforms(&value).map_err(anyhow::Error::msg)?);
            }
            "--output" => {
                parsed.output_root = PathBuf::from(next_option_value(&mut args, &flag)?);
            }
            "--snapshot" => {
                parsed.snapshot_path = Some(PathBuf::from(next_option_value(&mut args, &flag)?));
            }
            "--curl" => {
                parsed.curl_command = PathBuf::from(next_option_value(&mut args, &flag)?);
            }
            "--dry-run" => {
                parsed.dry_run = true;
            }
            "--plan" => {
                parsed.plan = true;
            }
            "--force" => {
                parsed.force = true;
            }
            "--audit-local" => {
                parsed.audit_local = true;
            }
            "--no-audit-local" => {
                parsed.audit_local = false;
            }
            "--repair" => {
                parsed.repair = true;
            }
            "--no-repair" => {
                parsed.repair = false;
            }
            "--help" | "-h" => {
                print_usage(&binary);
                std::process::exit(0);
            }
            _ => return Err(anyhow::anyhow!("unknown argument: {flag}")),
        }
    }

    Ok(parsed)
}

fn next_option_value(
    args: &mut impl Iterator<Item = String>,
    flag: &str,
) -> anyhow::Result<String> {
    args.next()
        .ok_or_else(|| anyhow::anyhow!("missing value for {flag}"))
}

fn print_usage(binary: &str) {
    eprintln!(
        "usage: {binary} [--auto-discover | --server-info-url <official-url> | --server-info-file <official-json-name> | --server-info-path <local-json>] \
         [--app-version 1.70.0] [--connection-group <name>] [--launcher-version 1.7.2] \
         [--platforms Windows,Android] [--output official_update_output] [--snapshot official-sync-snapshot.json] \
         [--curl curl] [--dry-run] [--plan] [--force] [--audit-local|--no-audit-local] [--repair|--no-repair]"
    );
}

fn parse_platforms(value: &str) -> Result<Vec<PatchPlatform>, String> {
    value
        .split(',')
        .map(str::trim)
        .filter(|part| !part.is_empty())
        .map(parse_platform)
        .collect()
}

fn parse_platform(value: &str) -> Result<PatchPlatform, String> {
    match value.to_ascii_lowercase().as_str() {
        "windows" | "win" => Ok(PatchPlatform::Windows),
        "android" => Ok(PatchPlatform::Android),
        _ => Err(format!("unsupported platform: {value}")),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn parse(values: &[&str]) -> anyhow::Result<CliArgs> {
        parse_args_from(values.iter().map(|value| value.to_string()))
    }

    fn fixture_base_snapshot() -> YostarJpSyncSnapshot {
        YostarJpSyncSnapshot {
            connection_group_name: "Prod-Audit".to_string(),
            app_version: "1.70.0".to_string(),
            bundle_version: Some("bundle".to_string()),
            addressables_root: "https://prod-clientpatch.bluearchiveyostar.com/root".to_string(),
            endpoints: vec![
                YostarJpResourceEndpoint {
                    kind: YostarJpResourceEndpointKind::TableCatalog,
                    platform: None,
                    url: "https://prod-clientpatch.bluearchiveyostar.com/root/TableBundles/TableCatalog.bytes".to_string(),
                },
                YostarJpResourceEndpoint {
                    kind: YostarJpResourceEndpointKind::TableCatalogHash,
                    platform: None,
                    url: "https://prod-clientpatch.bluearchiveyostar.com/root/TableBundles/TableCatalog.hash".to_string(),
                },
                YostarJpResourceEndpoint {
                    kind: YostarJpResourceEndpointKind::AddressablesCatalogHash,
                    platform: Some(PatchPlatform::Windows),
                    url: "https://prod-clientpatch.bluearchiveyostar.com/root/Windows_PatchPack/catalog_StandaloneWindows64.hash".to_string(),
                },
            ],
        }
    }

    fn fixture_marker(value: &str) -> OfficialEndpointMarkerSnapshot {
        OfficialEndpointMarkerSnapshot {
            kind: YostarJpResourceEndpointKind::TableCatalogHash,
            platform: None,
            url:
                "https://prod-clientpatch.bluearchiveyostar.com/root/TableBundles/TableCatalog.hash"
                    .to_string(),
            role: OfficialEndpointMarkerRole::OfficialSeedHash,
            value: value.to_string(),
        }
    }

    fn fixture_bootstrap() -> ResolvedBootstrap {
        ResolvedBootstrap {
            launcher_metadata: LauncherMetadataSnapshot {
                launcher_version: "1.7.2".to_string(),
                game_latest_version: "1.70.0".to_string(),
                game_latest_file_path: "BAJP_1.70.0.zip".to_string(),
                game_lowest_version: Some("1.69.0".to_string()),
                game_start_exe_name: Some("BlueArchive".to_string()),
                game_start_params: vec!["--prod".to_string()],
                manifest_url: "https://launcher-pkg-ba-jp.yo-star.com/manifest.json".to_string(),
                manifest_source: Some("BAJP_1.70.0.zip".to_string()),
                manifest_file_count: 42,
            },
            game_main_config: GameMainConfigSnapshot {
                server_info_data_url: Some(
                    "https://yostar-serverinfo.bluearchiveyostar.com/prod.json".to_string(),
                ),
                default_connection_group: Some("Prod-Audit".to_string()),
            },
            cache_hit: false,
        }
    }

    #[test]
    fn parses_auto_discover_update_check_args() {
        let args = parse(&[
            "official_update_check",
            "--auto-discover",
            "--platforms",
            "Windows,Android",
            "--snapshot",
            "/tmp/snapshot.json",
            "--dry-run",
            "--plan",
        ])
        .unwrap();

        assert!(args.auto_discover);
        assert_eq!(
            args.platforms.as_deref(),
            Some([PatchPlatform::Windows, PatchPlatform::Android].as_slice())
        );
        assert_eq!(
            args.snapshot_path,
            Some(PathBuf::from("/tmp/snapshot.json"))
        );
        assert!(args.dry_run);
        assert!(args.plan);
        assert!(args.audit_local);
        assert!(args.repair);
    }

    #[test]
    fn parses_explicit_snapshot_source_args() {
        let args = parse(&[
            "official_update_check",
            "--server-info-url",
            "https://yostar-serverinfo.bluearchiveyostar.com/r93_fixture.json",
            "--connection-group",
            "Prod-Audit",
            "--app-version",
            "1.70.0",
            "--no-audit-local",
            "--no-repair",
        ])
        .unwrap();

        assert!(!args.auto_discover);
        assert_eq!(args.connection_group.as_deref(), Some("Prod-Audit"));
        assert_eq!(args.app_version.as_deref(), Some("1.70.0"));
        assert!(!args.audit_local);
        assert!(!args.repair);
        assert!(matches!(
            args.server_info_source,
            Some(ServerInfoSource::OfficialUrl(ref url))
                if url == "https://yostar-serverinfo.bluearchiveyostar.com/r93_fixture.json"
        ));
    }

    #[test]
    fn persists_snapshot_json_round_trip() {
        let temp = tempfile::TempDir::new().unwrap();
        let path = temp.path().join("snapshot.json");
        let bootstrap = fixture_bootstrap();
        let snapshot = OfficialUpdateSnapshot::new(
            fixture_base_snapshot(),
            vec![fixture_marker("1234")],
            Some(&bootstrap),
        );

        write_snapshot(&path, &snapshot).unwrap();
        assert_eq!(read_snapshot(&path).unwrap(), Some(snapshot));
    }

    #[test]
    fn reads_legacy_snapshot_json() {
        let temp = tempfile::TempDir::new().unwrap();
        let path = temp.path().join("snapshot.json");
        let legacy = fixture_base_snapshot();
        fs::write(&path, serde_json::to_vec_pretty(&legacy).unwrap()).unwrap();

        let snapshot = read_snapshot(&path).unwrap().unwrap();
        assert_eq!(snapshot.base_snapshot(), legacy);
        assert!(snapshot.endpoint_markers.is_empty());
        assert_eq!(snapshot.snapshot_version, OFFICIAL_UPDATE_SNAPSHOT_VERSION);
    }

    #[test]
    fn marker_content_change_requires_download() {
        let previous = OfficialUpdateSnapshot::new(
            fixture_base_snapshot(),
            vec![fixture_marker("1111")],
            Some(&fixture_bootstrap()),
        );
        let current = OfficialUpdateSnapshot::new(
            fixture_base_snapshot(),
            vec![fixture_marker("2222")],
            Some(&fixture_bootstrap()),
        );

        let delta = diff_extended_snapshot(&current, Some(&previous));
        assert!(delta.endpoint_markers_changed);
        assert!(delta.has_changes());
        assert!(!delta.launcher_metadata_changed);
        assert!(!delta.game_main_config_changed);
    }

    #[test]
    fn persists_bootstrap_cache_json_round_trip() {
        let temp = tempfile::TempDir::new().unwrap();
        let path = temp.path().join("official-bootstrap-cache.json");
        let bootstrap = fixture_bootstrap();
        let cache = OfficialBootstrapCache {
            cache_version: OFFICIAL_BOOTSTRAP_CACHE_VERSION,
            launcher_metadata: bootstrap.launcher_metadata,
            game_main_config: bootstrap.game_main_config,
        };

        write_bootstrap_cache(&path, &cache).unwrap();
        assert_eq!(read_bootstrap_cache(&path).unwrap(), Some(cache));
    }

    #[test]
    fn bootstrap_cache_hit_requires_same_metadata_and_version() {
        let bootstrap = fixture_bootstrap();
        let cache = OfficialBootstrapCache {
            cache_version: OFFICIAL_BOOTSTRAP_CACHE_VERSION,
            launcher_metadata: bootstrap.launcher_metadata.clone(),
            game_main_config: bootstrap.game_main_config.clone(),
        };

        assert_eq!(
            cached_game_main_config_for_metadata(&cache, &bootstrap.launcher_metadata),
            Some(bootstrap.game_main_config.clone())
        );

        let mut changed_metadata = bootstrap.launcher_metadata.clone();
        changed_metadata.game_latest_version = "1.71.0".to_string();
        assert_eq!(
            cached_game_main_config_for_metadata(&cache, &changed_metadata),
            None
        );

        let stale_version_cache = OfficialBootstrapCache {
            cache_version: OFFICIAL_BOOTSTRAP_CACHE_VERSION + 1,
            ..cache
        };
        assert_eq!(
            cached_game_main_config_for_metadata(
                &stale_version_cache,
                &bootstrap.launcher_metadata
            ),
            None
        );
    }
}