//! Unity Addressables Catalog Driver
//!
//! 解析 Unity Addressables 的 catalog_Remote.json 文件

use super::driver::{GenericManifest, ManifestDriver, ManifestFormat, ManifestMetadata};
use async_trait::async_trait;
use base64::{engine::general_purpose::STANDARD, Engine as _};
use bat_core::domain::{ResourceEntry, ResourceType};
use serde_json::Value;
use std::collections::HashMap;

const ADDRESSABLES_ENTRY_RECORD_INTS: usize = 7;
const PLATFORM_LOAD_PATH_PLACEHOLDER: &str = "{PlatformUtils.AddressableLoadPath}";

/// Addressables Catalog Driver
pub struct AddressablesCatalogDriver;

impl AddressablesCatalogDriver {
    /// 创建新的 Driver 实例
    pub fn new() -> Self {
        Self
    }

    fn parse_json(raw_data: &[u8]) -> Result<Value, String> {
        let text = std::str::from_utf8(raw_data).map_err(|e| format!("Invalid UTF-8: {}", e))?;
        serde_json::from_str(text).map_err(|e| {
            format!(
                "Invalid JSON at line {}, column {}: {}",
                e.line(),
                e.column(),
                e
            )
        })
    }

    fn locator_id(json: &Value) -> Option<String> {
        let locator = json
            .get("m_LocatorId")
            .and_then(|value| value.as_str())
            .map(ToOwned::to_owned);
        locator
    }

    fn cdn_prefixes(json: &Value) -> Vec<String> {
        let prefixes = json
            .get("m_InternalIdPrefixes")
            .and_then(|value| value.as_array())
            .into_iter()
            .flatten()
            .filter_map(|value| value.as_str())
            .map(ToOwned::to_owned)
            .collect();
        prefixes
    }

    fn blob_bytes(json: &Value, field: &str) -> Option<Vec<u8>> {
        json.get(field)
            .and_then(|value| value.as_str())
            .and_then(|value| STANDARD.decode(value).ok())
    }

    fn read_u32_le(bytes: &[u8], offset: usize) -> Option<u32> {
        let end = offset.checked_add(4)?;
        let slice = bytes.get(offset..end)?;
        Some(u32::from_le_bytes(slice.try_into().ok()?))
    }

    fn read_i32_le(bytes: &[u8], offset: usize) -> Option<i32> {
        let end = offset.checked_add(4)?;
        let slice = bytes.get(offset..end)?;
        Some(i32::from_le_bytes(slice.try_into().ok()?))
    }

    fn blob_count(bytes: &[u8]) -> Option<usize> {
        Self::read_u32_le(bytes, 0).map(|value| value as usize)
    }

    fn blob_count_field(json: &Value, field: &str) -> Option<usize> {
        Self::blob_bytes(json, field).and_then(|bytes| Self::blob_count(&bytes))
    }

    fn internal_id_count(json: &Value) -> Option<usize> {
        json.get("m_InternalIds")
            .and_then(|value| value.as_array())
            .map(|values| values.len())
    }

    fn decode_serialized_string(bytes: &[u8], offset: usize) -> Option<(String, usize)> {
        let (object, next_offset) = Self::read_serialized_object(bytes, offset)?;
        object.into_key_string().map(|value| (value, next_offset))
    }

    fn read_serialized_object(bytes: &[u8], offset: usize) -> Option<(AddressablesObject, usize)> {
        let object_type = *bytes.get(offset)?;
        let mut cursor = offset.checked_add(1)?;

        match object_type {
            0 => {
                let len = Self::read_u32_le(bytes, cursor)? as usize;
                cursor = cursor.checked_add(4)?;
                let end = cursor.checked_add(len)?;
                let value = std::str::from_utf8(bytes.get(cursor..end)?)
                    .ok()?
                    .to_owned();
                Some((AddressablesObject::String(value), end))
            }
            1 => {
                let len = Self::read_u32_le(bytes, cursor)? as usize;
                cursor = cursor.checked_add(4)?;
                let end = cursor.checked_add(len)?;
                let units = bytes
                    .get(cursor..end)?
                    .chunks_exact(2)
                    .map(|chunk| u16::from_le_bytes([chunk[0], chunk[1]]))
                    .collect::<Vec<_>>();
                let value = String::from_utf16(&units).ok()?;
                Some((AddressablesObject::String(value), end))
            }
            2 => {
                let end = cursor.checked_add(2)?;
                let value = u16::from_le_bytes(bytes.get(cursor..end)?.try_into().ok()?);
                Some((AddressablesObject::Unsigned(value as u32), end))
            }
            3 => {
                let end = cursor.checked_add(4)?;
                let value = u32::from_le_bytes(bytes.get(cursor..end)?.try_into().ok()?);
                Some((AddressablesObject::Unsigned(value), end))
            }
            4 => {
                let end = cursor.checked_add(4)?;
                let value = i32::from_le_bytes(bytes.get(cursor..end)?.try_into().ok()?);
                Some((AddressablesObject::Signed(value), end))
            }
            5 => {
                let len = *bytes.get(cursor)? as usize;
                cursor = cursor.checked_add(1)?;
                let end = cursor.checked_add(len)?;
                let value = std::str::from_utf8(bytes.get(cursor..end)?)
                    .ok()?
                    .to_owned();
                Some((AddressablesObject::Hash128(value), end))
            }
            7 => Self::read_serialized_json_object(bytes, cursor),
            _ => None,
        }
    }

    fn read_serialized_json_object(
        bytes: &[u8],
        mut cursor: usize,
    ) -> Option<(AddressablesObject, usize)> {
        let assembly_len = *bytes.get(cursor)? as usize;
        cursor = cursor.checked_add(1)?;
        let assembly_end = cursor.checked_add(assembly_len)?;
        let assembly_name = std::str::from_utf8(bytes.get(cursor..assembly_end)?)
            .ok()?
            .to_owned();
        cursor = assembly_end;

        let class_len = *bytes.get(cursor)? as usize;
        cursor = cursor.checked_add(1)?;
        let class_end = cursor.checked_add(class_len)?;
        let class_name = std::str::from_utf8(bytes.get(cursor..class_end)?)
            .ok()?
            .to_owned();
        cursor = class_end;

        let json_len = Self::read_u32_le(bytes, cursor)? as usize;
        cursor = cursor.checked_add(4)?;
        let json_end = cursor.checked_add(json_len)?;
        let units = bytes
            .get(cursor..json_end)?
            .chunks_exact(2)
            .map(|chunk| u16::from_le_bytes([chunk[0], chunk[1]]))
            .collect::<Vec<_>>();
        let json_text = String::from_utf16(&units).ok()?;
        let json = serde_json::from_str(&json_text).ok();

        Some((
            AddressablesObject::JsonObject {
                assembly_name,
                class_name,
                json,
            },
            json_end,
        ))
    }

    fn resource_type_for_path(path: &str) -> ResourceType {
        let normalized = path.replace('\\', "/").to_ascii_lowercase();
        if normalized.contains("catalog") || normalized.ends_with(".hash") {
            ResourceType::Manifest
        } else if normalized.contains("tablebundles/") {
            ResourceType::TableBundle
        } else if normalized.contains("mediaresources/")
            || normalized.contains("mediaresources-")
            || matches!(
                normalized.rsplit('.').next(),
                Some(
                    "mp3" | "mp4" | "ogg" | "wav" | "png" | "jpg" | "jpeg" | "webp" | "acb" | "awb"
                )
            )
        {
            ResourceType::Media
        } else if normalized.ends_with(".bundle") {
            ResourceType::AssetBundle
        } else if normalized.contains("textassets/")
            || matches!(
                normalized.rsplit('.').next(),
                Some("txt" | "csv" | "xml" | "yaml" | "yml")
            )
        {
            ResourceType::TextAsset
        } else if normalized.ends_with(".bytes") {
            ResourceType::TableBundle
        } else {
            ResourceType::Other
        }
    }

    fn resource_type_for_compact_entry(
        path: &str,
        resource_type_name: Option<&str>,
    ) -> ResourceType {
        if resource_type_name.is_some_and(|name| name.contains("IAssetBundleResource")) {
            return ResourceType::AssetBundle;
        }

        if resource_type_name.is_some_and(|name| name.contains("ContentCatalogData")) {
            return ResourceType::Manifest;
        }

        if resource_type_name.is_some_and(|name| name.contains("TextAsset")) {
            return ResourceType::TextAsset;
        }

        if resource_type_name.is_some_and(|name| {
            name.contains("AudioClip") || name.contains("VideoClip") || name.contains("Texture2D")
        }) {
            return ResourceType::Media;
        }

        Self::resource_type_for_path(path)
    }

    fn resource_from_entry(value: &Value, index: usize) -> Option<ResourceEntry> {
        let path = value
            .get("internal_id")
            .or_else(|| value.get("InternalId"))
            .or_else(|| value.get("path"))
            .or_else(|| value.get("Path"))
            .and_then(|value| value.as_str())?;

        if path.is_empty() {
            return None;
        }

        let address = Self::string_field(value, &["address", "Address", "m_Address", "key", "Key"]);
        let hash = value
            .get("hash")
            .or_else(|| value.get("Hash"))
            .or_else(|| value.get("m_Hash"))
            .and_then(|value| value.as_str())
            .map(ToOwned::to_owned)
            .unwrap_or_else(|| format!("addressable_{}", index));

        let size = value
            .get("size")
            .or_else(|| value.get("Size"))
            .or_else(|| value.get("m_Size"))
            .and_then(|value| value.as_u64())
            .unwrap_or_default();

        let dependencies = Self::dependencies_from_entry(value);

        Some(ResourceEntry {
            path: path.to_string(),
            hash,
            size,
            resource_type: Self::resource_type_for_path(path),
            address,
            dependencies,
        })
    }

    fn string_field(value: &Value, fields: &[&str]) -> Option<String> {
        fields.iter().find_map(|field| {
            value
                .get(field)
                .and_then(|value| value.as_str())
                .map(ToOwned::to_owned)
        })
    }

    fn string_array_field(value: &Value, fields: &[&str]) -> Vec<String> {
        for field in fields {
            if let Some(array) = value.get(field).and_then(|value| value.as_array()) {
                let strings = array
                    .iter()
                    .filter_map(|item| match item {
                        Value::String(value) => Some(value.clone()),
                        Value::Object(object) => object
                            .get("internal_id")
                            .or_else(|| object.get("InternalId"))
                            .or_else(|| object.get("path"))
                            .or_else(|| object.get("Path"))
                            .and_then(|value| value.as_str())
                            .map(ToOwned::to_owned),
                        _ => None,
                    })
                    .collect::<Vec<_>>();
                if !strings.is_empty() {
                    return strings;
                }
            }
        }

        Vec::new()
    }

    fn dependencies_from_entry(value: &Value) -> Vec<String> {
        let dependencies = Self::string_array_field(
            value,
            &[
                "dependencies",
                "Dependencies",
                "m_Dependencies",
                "dependency",
                "Dependency",
                "m_Dependency",
            ],
        );
        if !dependencies.is_empty() {
            return dependencies;
        }

        Self::string_array_field(
            value,
            &[
                "m_Dependencies",
                "asset_dependencies",
                "AssetDependencies",
                "resource_dependencies",
                "ResourceDependencies",
            ],
        )
    }

    fn entry_resources(json: &Value) -> Vec<ResourceEntry> {
        json.get("m_Entries")
            .or_else(|| json.get("entries"))
            .and_then(|value| value.as_array())
            .into_iter()
            .flatten()
            .enumerate()
            .filter_map(|(index, value)| Self::resource_from_entry(value, index))
            .collect()
    }

    fn internal_id_resources(json: &Value) -> Vec<ResourceEntry> {
        json.get("m_InternalIds")
            .and_then(|value| value.as_array())
            .into_iter()
            .flatten()
            .enumerate()
            .filter_map(|(index, value)| {
                let path = value.as_str()?;
                if path.is_empty() {
                    return None;
                }

                Some(ResourceEntry {
                    path: path.to_string(),
                    hash: format!("addressable_{}", index),
                    size: 0,
                    resource_type: Self::resource_type_for_path(path),
                    address: None,
                    dependencies: Vec::new(),
                })
            })
            .collect()
    }

    fn key_data_resources(json: &Value) -> Vec<ResourceEntry> {
        let Some(bytes) = Self::blob_bytes(json, "m_KeyDataString") else {
            return Vec::new();
        };

        let expected_count = Self::blob_count(&bytes).unwrap_or_default();
        if expected_count == 0 {
            return Vec::new();
        }

        let limit = Self::internal_id_count(json).unwrap_or(expected_count);
        let mut resources = Vec::with_capacity(expected_count.min(limit));
        let mut offset = 4;

        while offset < bytes.len() && resources.len() < limit {
            let Some((path, next_offset)) = Self::decode_serialized_string(&bytes, offset) else {
                break;
            };
            offset = next_offset;
            if path.is_empty() {
                continue;
            }

            let index = resources.len();
            let resource_type = Self::resource_type_for_path(&path);
            resources.push(ResourceEntry {
                path,
                hash: format!("addressable_{}", index),
                size: 0,
                resource_type,
                address: None,
                dependencies: Vec::new(),
            });
        }

        resources
    }

    fn compact_entry_resources(json: &Value) -> Vec<ResourceEntry> {
        let Some(internal_ids) = Self::string_array(json, "m_InternalIds") else {
            return Vec::new();
        };
        let Some(provider_ids) = Self::string_array(json, "m_ProviderIds") else {
            return Vec::new();
        };
        let Some(key_bytes) = Self::blob_bytes(json, "m_KeyDataString") else {
            return Vec::new();
        };
        let Some(entry_records) = Self::compact_entry_records(json) else {
            return Vec::new();
        };
        let Some(buckets) = Self::compact_buckets(json) else {
            return Vec::new();
        };

        let keys = Self::compact_keys(&key_bytes, &buckets);
        if keys.is_empty() {
            return Vec::new();
        }

        let internal_id_prefixes = Self::string_array(json, "m_InternalIdPrefixes")
            .unwrap_or_default()
            .into_iter()
            .collect::<Vec<_>>();
        let extra_data = Self::blob_bytes(json, "m_ExtraDataString").unwrap_or_default();

        entry_records
            .iter()
            .enumerate()
            .filter_map(|(index, record)| {
                let internal_id = internal_ids.get(record.internal_id as usize)?;
                provider_ids.get(record.provider_index as usize)?;
                let primary_key = keys
                    .get(record.primary_key_index as usize)
                    .and_then(|key| key.as_ref())
                    .and_then(AddressablesObject::key_string)
                    .unwrap_or_else(|| format!("addressable_{}", index));
                let path = Self::normalize_internal_id(&internal_id_prefixes, internal_id);
                let extra = Self::extra_data_at(&extra_data, record.data_index);
                let resource_type_name = Self::resource_type_name(json, record.resource_type_index);
                let dependencies =
                    Self::compact_dependencies(record, &entry_records, &buckets, &keys);
                let hash = extra
                    .hash
                    .filter(|value| !value.is_empty())
                    .or_else(|| extra.bundle_name.filter(|value| !value.is_empty()))
                    .unwrap_or_else(|| format!("addressable_{}", index));

                Some(ResourceEntry {
                    path: path.clone(),
                    hash,
                    size: extra.bundle_size.unwrap_or_default(),
                    resource_type: Self::resource_type_for_compact_entry(
                        &path,
                        resource_type_name.as_deref(),
                    ),
                    address: if primary_key.is_empty() {
                        None
                    } else {
                        Some(primary_key)
                    },
                    dependencies,
                })
            })
            .collect()
    }

    fn string_array(json: &Value, field: &str) -> Option<Vec<String>> {
        json.get(field)?
            .as_array()?
            .iter()
            .map(|value| value.as_str().map(ToOwned::to_owned))
            .collect()
    }

    fn compact_entry_records(json: &Value) -> Option<Vec<CompactEntryRecord>> {
        let bytes = Self::blob_bytes(json, "m_EntryDataString")?;
        let count = Self::blob_count(&bytes)?;
        let expected_len = 4usize.checked_add(
            count
                .checked_mul(ADDRESSABLES_ENTRY_RECORD_INTS)?
                .checked_mul(4)?,
        )?;
        if bytes.len() < expected_len {
            return None;
        }

        let mut records = Vec::with_capacity(count);
        let mut offset = 4;
        for _ in 0..count {
            records.push(CompactEntryRecord {
                internal_id: Self::read_i32_le(&bytes, offset)?,
                provider_index: Self::read_i32_le(&bytes, offset + 4)?,
                dependency_key_index: Self::read_i32_le(&bytes, offset + 8)?,
                data_index: Self::read_i32_le(&bytes, offset + 16)?,
                primary_key_index: Self::read_i32_le(&bytes, offset + 20)?,
                resource_type_index: Self::read_i32_le(&bytes, offset + 24)?,
            });
            offset += ADDRESSABLES_ENTRY_RECORD_INTS * 4;
        }

        Some(records)
    }

    fn compact_buckets(json: &Value) -> Option<Vec<CompactBucket>> {
        let bytes = Self::blob_bytes(json, "m_BucketDataString")?;
        let count = Self::blob_count(&bytes)?;
        let mut buckets = Vec::with_capacity(count);
        let mut offset = 4;

        for _ in 0..count {
            let key_offset = Self::read_i32_le(&bytes, offset)?;
            let entry_count = Self::read_i32_le(&bytes, offset + 4)?;
            if key_offset < 0 || entry_count < 0 {
                return None;
            }
            offset += 8;

            let mut entries = Vec::with_capacity(entry_count as usize);
            for _ in 0..entry_count {
                let entry_index = Self::read_i32_le(&bytes, offset)?;
                if entry_index < 0 {
                    return None;
                }
                entries.push(entry_index as usize);
                offset += 4;
            }

            buckets.push(CompactBucket {
                key_offset: key_offset as usize,
                entries,
            });
        }

        Some(buckets)
    }

    fn compact_keys(
        key_bytes: &[u8],
        buckets: &[CompactBucket],
    ) -> Vec<Option<AddressablesObject>> {
        buckets
            .iter()
            .map(|bucket| {
                Self::read_serialized_object(key_bytes, bucket.key_offset).map(|(object, _)| object)
            })
            .collect()
    }

    fn compact_dependencies(
        record: &CompactEntryRecord,
        records: &[CompactEntryRecord],
        buckets: &[CompactBucket],
        keys: &[Option<AddressablesObject>],
    ) -> Vec<String> {
        if record.dependency_key_index < 0 {
            return Vec::new();
        }

        buckets
            .get(record.dependency_key_index as usize)
            .into_iter()
            .flat_map(|bucket| bucket.entries.iter().copied())
            .filter_map(|entry_index| records.get(entry_index))
            .filter_map(|dependency_record| keys.get(dependency_record.primary_key_index as usize))
            .filter_map(|key| key.as_ref())
            .filter_map(AddressablesObject::key_string)
            .collect()
    }

    fn extra_data_at(extra_data: &[u8], data_index: i32) -> AddressablesExtraData {
        if data_index < 0 {
            return AddressablesExtraData::default();
        }

        let Some((object, _)) = Self::read_serialized_object(extra_data, data_index as usize)
        else {
            return AddressablesExtraData::default();
        };

        let AddressablesObject::JsonObject { json, .. } = object else {
            return AddressablesExtraData::default();
        };

        let Some(json) = json else {
            return AddressablesExtraData::default();
        };

        AddressablesExtraData {
            hash: json
                .get("m_Hash")
                .and_then(|value| value.as_str())
                .map(ToOwned::to_owned),
            bundle_name: json
                .get("m_BundleName")
                .and_then(|value| value.as_str())
                .map(ToOwned::to_owned),
            bundle_size: json.get("m_BundleSize").and_then(|value| value.as_u64()),
        }
    }

    fn resource_type_name(json: &Value, index: i32) -> Option<String> {
        if index < 0 {
            return None;
        }

        json.get("m_resourceTypes")?
            .as_array()?
            .get(index as usize)?
            .get("m_ClassName")?
            .as_str()
            .map(ToOwned::to_owned)
    }

    fn normalize_internal_id(prefixes: &[String], internal_id: &str) -> String {
        let expanded = Self::expand_internal_id(prefixes, internal_id);
        let normalized = expanded.replace('\\', "/");
        normalized
            .strip_prefix(PLATFORM_LOAD_PATH_PLACEHOLDER)
            .map(|path| path.trim_start_matches('/').to_string())
            .unwrap_or(normalized)
    }

    fn expand_internal_id(prefixes: &[String], internal_id: &str) -> String {
        if prefixes.is_empty() {
            return internal_id.to_string();
        }

        let Some((index, path)) = internal_id.rsplit_once('#') else {
            return internal_id.to_string();
        };
        let Ok(index) = index.parse::<usize>() else {
            return internal_id.to_string();
        };
        let Some(prefix) = prefixes.get(index) else {
            return internal_id.to_string();
        };

        format!("{prefix}{path}")
    }

    fn resources(json: &Value) -> Vec<ResourceEntry> {
        let entry_resources = Self::entry_resources(json);
        if !entry_resources.is_empty() {
            return entry_resources;
        }

        let compact_resources = Self::compact_entry_resources(json);
        if !compact_resources.is_empty() {
            return compact_resources;
        }

        let key_resources = Self::key_data_resources(json);
        if !key_resources.is_empty()
            && Self::internal_id_count(json)
                .map(|count| key_resources.len() >= count)
                .unwrap_or(true)
        {
            return key_resources;
        }

        Self::internal_id_resources(json)
    }

    fn extra_metadata(json: &Value) -> HashMap<String, String> {
        let mut extra = HashMap::new();
        Self::insert_array_len(&mut extra, json, "m_InternalIds", "internal_id_count");
        Self::insert_array_len(&mut extra, json, "m_Entries", "entry_count");
        Self::insert_array_len(&mut extra, json, "m_resourceTypes", "resource_type_count");
        Self::insert_blob_count(&mut extra, json, "m_KeyDataString", "key_object_count");
        Self::insert_blob_count(
            &mut extra,
            json,
            "m_BucketDataString",
            "bucket_record_count",
        );
        Self::insert_blob_count(&mut extra, json, "m_EntryDataString", "entry_record_count");
        Self::insert_string_len(&mut extra, json, "m_KeyDataString", "key_data_string_len");
        Self::insert_string_len(
            &mut extra,
            json,
            "m_BucketDataString",
            "bucket_data_string_len",
        );
        Self::insert_string_len(
            &mut extra,
            json,
            "m_EntryDataString",
            "entry_data_string_len",
        );
        Self::insert_string_len(
            &mut extra,
            json,
            "m_ExtraDataString",
            "extra_data_string_len",
        );
        Self::insert_dependency_count(&mut extra, json);
        extra
    }

    fn insert_array_len(extra: &mut HashMap<String, String>, json: &Value, field: &str, key: &str) {
        if let Some(len) = json
            .get(field)
            .and_then(|value| value.as_array())
            .map(|values| values.len())
        {
            extra.insert(key.to_string(), len.to_string());
        }
    }

    fn insert_string_len(
        extra: &mut HashMap<String, String>,
        json: &Value,
        field: &str,
        key: &str,
    ) {
        if let Some(len) = json
            .get(field)
            .and_then(|value| value.as_str())
            .map(|value| value.len())
        {
            extra.insert(key.to_string(), len.to_string());
        }
    }

    fn insert_blob_count(
        extra: &mut HashMap<String, String>,
        json: &Value,
        field: &str,
        key: &str,
    ) {
        if let Some(count) = Self::blob_count_field(json, field) {
            extra.insert(key.to_string(), count.to_string());
        }
    }

    fn insert_dependency_count(extra: &mut HashMap<String, String>, json: &Value) {
        let count = Self::entry_resources(json)
            .into_iter()
            .map(|entry| entry.dependencies.len())
            .sum::<usize>();
        if count > 0 {
            extra.insert("dependency_count".to_string(), count.to_string());
        }
    }
}

#[derive(Debug, Clone)]
enum AddressablesObject {
    String(String),
    Unsigned(u32),
    Signed(i32),
    Hash128(String),
    JsonObject {
        assembly_name: String,
        class_name: String,
        json: Option<Value>,
    },
}

impl AddressablesObject {
    fn key_string(&self) -> Option<String> {
        match self {
            Self::String(value) | Self::Hash128(value) => Some(value.clone()),
            Self::Unsigned(value) => Some(value.to_string()),
            Self::Signed(value) => Some(value.to_string()),
            Self::JsonObject {
                assembly_name,
                class_name,
                ..
            } => Some(format!("{assembly_name}:{class_name}")),
        }
    }

    fn into_key_string(self) -> Option<String> {
        self.key_string()
    }
}

#[derive(Debug, Clone)]
struct CompactEntryRecord {
    internal_id: i32,
    provider_index: i32,
    dependency_key_index: i32,
    data_index: i32,
    primary_key_index: i32,
    resource_type_index: i32,
}

#[derive(Debug, Clone)]
struct CompactBucket {
    key_offset: usize,
    entries: Vec<usize>,
}

#[derive(Debug, Clone, Default)]
struct AddressablesExtraData {
    hash: Option<String>,
    bundle_name: Option<String>,
    bundle_size: Option<u64>,
}

impl Default for AddressablesCatalogDriver {
    fn default() -> Self {
        Self::new()
    }
}

#[async_trait]
impl ManifestDriver for AddressablesCatalogDriver {
    fn name(&self) -> &str {
        "Unity Addressables Catalog"
    }

    fn format_version(&self) -> &str {
        "1.0"
    }

    fn can_parse(&self, raw_data: &[u8]) -> bool {
        // 检测是否是 Addressables Catalog
        // 1. 必须是有效的 JSON
        // 2. 必须包含 m_LocatorId 字段
        // 3. m_LocatorId 值应该是 "AddressablesMainContentCatalog"

        let text = match std::str::from_utf8(raw_data) {
            Ok(t) => t,
            Err(_) => return false,
        };

        let json: Value = match serde_json::from_str(text) {
            Ok(j) => j,
            Err(_) => return false,
        };

        let locator_id = match json.get("m_LocatorId") {
            Some(id) => id,
            None => return false,
        };

        let id_str = match locator_id.as_str() {
            Some(s) => s,
            None => return false,
        };

        id_str.contains("AddressablesMainContentCatalog") || id_str.contains("Addressables")
    }

    async fn parse(&self, raw_data: &[u8]) -> Result<GenericManifest, String> {
        let json = Self::parse_json(raw_data)?;

        let metadata = ManifestMetadata {
            locator_id: Self::locator_id(&json),
            cdn_prefixes: Self::cdn_prefixes(&json),
            extra: Self::extra_metadata(&json),
        };

        Ok(GenericManifest {
            format: ManifestFormat::AddressablesCatalog,
            resources: Self::resources(&json),
            metadata,
        })
    }
}

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

    #[test]
    fn test_can_parse_valid_catalog() {
        let driver = AddressablesCatalogDriver::new();

        let valid_json = r#"{
            "m_LocatorId": "AddressablesMainContentCatalog",
            "m_InternalIds": []
        }"#;

        assert!(driver.can_parse(valid_json.as_bytes()));
    }

    #[test]
    fn test_can_parse_invalid() {
        let driver = AddressablesCatalogDriver::new();

        let invalid_json = r#"{"some": "other"}"#;
        assert!(!driver.can_parse(invalid_json.as_bytes()));

        let not_json = b"not json at all";
        assert!(!driver.can_parse(not_json));
    }

    #[tokio::test]
    async fn test_parse_simple_catalog() {
        let driver = AddressablesCatalogDriver::new();

        let catalog_json = r#"{
            "m_LocatorId": "AddressablesMainContentCatalog",
            "m_InternalIdPrefixes": [],
            "m_InternalIds": [
                "synthetic/minimal-a.bundle",
                "synthetic/minimal-b.bundle",
                "synthetic/catalog.json"
            ]
        }"#;

        let result = driver.parse(catalog_json.as_bytes()).await;
        assert!(result.is_ok());

        let manifest = result.unwrap();
        assert_eq!(manifest.format, ManifestFormat::AddressablesCatalog);
        assert_eq!(manifest.resources.len(), 3);
        assert_eq!(
            manifest.resources[0].resource_type,
            ResourceType::AssetBundle
        );
    }

    #[tokio::test]
    async fn test_parse_entry_catalog_resources_and_metadata() {
        let driver = AddressablesCatalogDriver::new();

        let catalog_json = r#"{
            "m_LocatorId": "AddressablesMainContentCatalog",
            "m_InternalIdPrefixes": ["https://synthetic.invalid/bundles/"],
            "m_InternalIds": ["synthetic/fallback.bundle"],
            "m_KeyDataString": "key-data",
            "m_EntryDataString": "entry-data",
            "m_resourceTypes": ["AssetBundle", "Manifest"],
            "m_Entries": [
                {
                    "internal_id": "synthetic/minimal.bundle",
                    "hash": "synthetic-entry-hash",
                    "size": 119,
                    "address": "Character_001",
                    "dependencies": ["synthetic/shared.bundle"]
                },
                {
                    "internal_id": "synthetic/catalog.json",
                    "hash": "synthetic-catalog-hash",
                    "size": 2
                }
            ]
        }"#;

        let manifest = driver.parse(catalog_json.as_bytes()).await.unwrap();

        assert_eq!(manifest.resources.len(), 2);
        assert_eq!(manifest.resources[0].path, "synthetic/minimal.bundle");
        assert_eq!(manifest.resources[0].hash, "synthetic-entry-hash");
        assert_eq!(manifest.resources[0].size, 119);
        assert_eq!(
            manifest.resources[0].address.as_deref(),
            Some("Character_001")
        );
        assert_eq!(
            manifest.resources[0].dependencies,
            vec!["synthetic/shared.bundle".to_string()]
        );
        assert_eq!(
            manifest.resources[0].resource_type,
            ResourceType::AssetBundle
        );
        assert_eq!(manifest.resources[1].resource_type, ResourceType::Manifest);
        assert_eq!(
            manifest.metadata.cdn_prefixes,
            vec!["https://synthetic.invalid/bundles/".to_string()]
        );
        assert_eq!(
            manifest.metadata.extra.get("internal_id_count"),
            Some(&"1".to_string())
        );
        assert_eq!(
            manifest.metadata.extra.get("entry_count"),
            Some(&"2".to_string())
        );
        assert_eq!(
            manifest.metadata.extra.get("key_data_string_len"),
            Some(&"8".to_string())
        );
        assert_eq!(
            manifest.metadata.extra.get("entry_data_string_len"),
            Some(&"10".to_string())
        );
        assert_eq!(
            manifest.metadata.extra.get("resource_type_count"),
            Some(&"2".to_string())
        );
        assert_eq!(
            manifest.metadata.extra.get("dependency_count"),
            Some(&"1".to_string())
        );
    }

    #[tokio::test]
    async fn test_parse_reports_json_location() {
        let driver = AddressablesCatalogDriver::new();

        let error = driver
            .parse(
                b"{\n  \"m_LocatorId\": \"AddressablesMainContentCatalog\",\n  \"m_Entries\": [\n",
            )
            .await
            .expect_err("expected parse failure");

        assert!(error.contains("Invalid JSON at line"));
    }

    #[tokio::test]
    async fn test_parse_table_bundle_resource_types() {
        let driver = AddressablesCatalogDriver::new();

        let catalog_json = r#"{
            "m_LocatorId": "AddressablesMainContentCatalog",
            "m_InternalIds": [
                "TableBundles/10031865119468584059_717066257.bytes"
            ]
        }"#;

        let manifest = driver.parse(catalog_json.as_bytes()).await.unwrap();

        assert_eq!(manifest.resources.len(), 1);
        assert_eq!(
            manifest.resources[0].resource_type,
            ResourceType::TableBundle
        );
    }

    #[tokio::test]
    async fn test_parse_text_and_media_resource_types() {
        let driver = AddressablesCatalogDriver::new();

        let catalog_json = r#"{
            "m_LocatorId": "AddressablesMainContentCatalog",
            "m_Entries": [
                {"internal_id": "TextAssets/dialogue.csv"},
                {"internal_id": "MediaResources-Windows/voice/academy.acb"},
                {"internal_id": "MediaResources-Windows/movie/opening.mp4"}
            ]
        }"#;

        let manifest = driver.parse(catalog_json.as_bytes()).await.unwrap();

        assert_eq!(manifest.resources[0].resource_type, ResourceType::TextAsset);
        assert_eq!(manifest.resources[1].resource_type, ResourceType::Media);
        assert_eq!(manifest.resources[2].resource_type, ResourceType::Media);
    }
}