// file: crates/ksp-app-wallet-desk/src/wallet_config.rs
// version: 2

//! Wallet Desk composition adapter for the standard Wallet Config and its application-owned directory preparation.

/// Resolved Wallet Config and directory preparation status captured during application bootstrap.
pub(crate) struct WalletConfigStartup {
    composite_profile_id: String,
    effective_directory_created_on_startup: bool,
    resolved: ksp_config_lib::ResolvedWalletConfig,
    root_directory_created_on_startup: bool,
}

impl WalletConfigStartup {
    /// Returns the selected Wallet Desk composite profile.
    pub(crate) fn composite_profile_id(&self) -> &str {
        return self.composite_profile_id.as_str();
    }

    /// Reports whether bootstrap created at least one missing component of the effective Wallet profile directory.
    pub(crate) const fn effective_directory_created_on_startup(&self) -> bool {
        return self.effective_directory_created_on_startup;
    }

    /// Returns the resolved standard Wallet configuration.
    pub(crate) const fn resolved(&self) -> &ksp_config_lib::ResolvedWalletConfig {
        return &self.resolved;
    }

    /// Reports whether bootstrap created the configured global Wallet root.
    pub(crate) const fn root_directory_created_on_startup(&self) -> bool {
        return self.root_directory_created_on_startup;
    }
}

/// Resolves the Wallet component selected by the Wallet Desk composite and prepares its global/effective directory tree.
pub(crate) fn initialize_wallet_config(management: &ksp_config_lib::ConfigManagement) -> ksp_core_lib::Result<WalletConfigStartup> {
    let environment = ksp_config_lib::ConfigEnvironment::load();
    let environment = match environment {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let composite = crate::load_wallet_desk_composite(management);
    let composite = match composite {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let logging_profile = crate::required_composite_component_profile(&composite, crate::COMPOSITE_COMPONENT_ID_LOGGING, ksp_config_lib::FILE_ID_STD_LOGGING);
    if let std::result::Result::Err(error) = logging_profile {
        return std::result::Result::Err(error);
    }
    let transport_profile =
        crate::required_composite_component_profile(&composite, crate::COMPOSITE_COMPONENT_ID_TRANSPORT, ksp_config_lib::FILE_ID_STD_TRANSPORT);
    if let std::result::Result::Err(error) = transport_profile {
        return std::result::Result::Err(error);
    }
    let wallet_profile = crate::required_composite_component_profile(&composite, crate::COMPOSITE_COMPONENT_ID_WALLET, ksp_config_lib::FILE_ID_STD_WALLET);
    let wallet_profile = match wallet_profile {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let resolved = management.engine().resolve_wallet_config_profile(&wallet_profile, &environment);
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let preparation = prepare_wallet_directories(&resolved);
    let preparation = match preparation {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let root_path = resolved.wallets_directory().to_string_lossy().into_owned();
    let effective_path = resolved.effective_wallets_directory().to_string_lossy().into_owned();
    ksp_logging_lib::debug!(target: crate::TRACING_TARGET, domain = crate::TRACING_DOMAIN_WALLET_CONFIG, composite_profile = composite.profile_id(), wallet_profile = resolved.profile_id(), root_path = root_path.as_str(), effective_path = effective_path.as_str(), root_created = preparation.root_created, effective_created = preparation.effective_created, "Wallet Desk Wallet directories are ready");
    return std::result::Result::Ok(WalletConfigStartup {
        composite_profile_id: composite.profile_id().to_owned(),
        effective_directory_created_on_startup: preparation.effective_created,
        resolved,
        root_directory_created_on_startup: preparation.root_created,
    });
}

struct WalletDirectoryPreparation {
    effective_created: bool,
    root_created: bool,
}

fn prepare_wallet_directories(resolved: &ksp_config_lib::ResolvedWalletConfig) -> ksp_core_lib::Result<WalletDirectoryPreparation> {
    let root_created = ensure_global_wallet_root(resolved.wallets_directory());
    let root_created = match root_created {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let effective_created = match resolved.wallets_subdirectory() {
        std::option::Option::Some(subdirectory) => {
            let created = ensure_profile_wallet_directory(resolved.wallets_directory(), subdirectory);
            match created {
                std::result::Result::Ok(value) => value,
                std::result::Result::Err(error) => return std::result::Result::Err(error),
            }
        },
        std::option::Option::None => root_created,
    };
    return std::result::Result::Ok(WalletDirectoryPreparation { effective_created, root_created });
}

fn ensure_global_wallet_root(path: &std::path::Path) -> ksp_core_lib::Result<bool> {
    let metadata = std::fs::symlink_metadata(path);
    return match metadata {
        std::result::Result::Ok(metadata) if metadata.file_type().is_symlink() => directory_invalid(path, "configured Wallet root cannot be a symbolic link"),
        std::result::Result::Ok(metadata) if metadata.is_dir() => std::result::Result::Ok(false),
        std::result::Result::Ok(_) => directory_invalid(path, "configured Wallet root exists but is not a directory"),
        std::result::Result::Err(error) if error.kind() == std::io::ErrorKind::NotFound => {
            let creation = std::fs::create_dir_all(path);
            match creation {
                std::result::Result::Ok(()) => std::result::Result::Ok(true),
                std::result::Result::Err(error) => directory_prepare_error(path, "configured Wallet root cannot be created", error),
            }
        },
        std::result::Result::Err(error) => directory_prepare_error(path, "configured Wallet root cannot be inspected", error),
    };
}

fn ensure_profile_wallet_directory(root: &std::path::Path, subdirectory: &std::path::Path) -> ksp_core_lib::Result<bool> {
    let mut current = root.to_path_buf();
    let mut created = false;
    for component in subdirectory.components() {
        let normal = match component {
            std::path::Component::Normal(value) => value,
            _ => return directory_invalid(subdirectory, "Wallet profile subdirectory contains an unsafe path component"),
        };
        current.push(normal);
        let metadata = std::fs::symlink_metadata(current.as_path());
        match metadata {
            std::result::Result::Ok(metadata) if metadata.file_type().is_symlink() => {
                return directory_invalid(current.as_path(), "Wallet profile directory path traverses a symbolic link");
            },
            std::result::Result::Ok(metadata) if metadata.is_dir() => {},
            std::result::Result::Ok(_) => return directory_invalid(current.as_path(), "Wallet profile directory path contains a non-directory entry"),
            std::result::Result::Err(error) if error.kind() == std::io::ErrorKind::NotFound => {
                let creation = std::fs::create_dir(current.as_path());
                if let std::result::Result::Err(error) = creation {
                    return directory_prepare_error(current.as_path(), "Wallet profile directory component cannot be created", error);
                }
                created = true;
            },
            std::result::Result::Err(error) => {
                return directory_prepare_error(current.as_path(), "Wallet profile directory component cannot be inspected", error);
            },
        }
    }
    return std::result::Result::Ok(created);
}

fn directory_invalid<T>(path: &std::path::Path, reason: &'static str) -> ksp_core_lib::Result<T> {
    let path_text = path.to_string_lossy().into_owned();
    ksp_logging_lib::error!(target: crate::TRACING_TARGET, domain = crate::TRACING_DOMAIN_WALLET_CONFIG, path = path_text.as_str(), reason, "Wallet directory preparation rejected an invalid filesystem object");
    return std::result::Result::Err(
        ksp_core_lib::Error::new(crate::ERROR_CODE_WALLET_DIRECTORY_INVALID, "Configured Wallet directory is invalid")
            .with_context("path", path_text)
            .with_context("reason", reason),
    );
}

fn directory_prepare_error<T>(path: &std::path::Path, reason: &'static str, source: std::io::Error) -> ksp_core_lib::Result<T> {
    let path_text = path.to_string_lossy().into_owned();
    let source_kind = std::format!("{:?}", source.kind());
    ksp_logging_lib::error!(target: crate::TRACING_TARGET, domain = crate::TRACING_DOMAIN_WALLET_CONFIG, path = path_text.as_str(), reason, source_kind = source_kind.as_str(), "Wallet directory preparation failed");
    return std::result::Result::Err(
        ksp_core_lib::Error::new(crate::ERROR_CODE_WALLET_DIRECTORY_PREPARE_FAILED, "Configured Wallet directory cannot be prepared")
            .with_context("path", path_text)
            .with_context("reason", reason)
            .with_source(source),
    );
}

#[cfg(test)]
#[path = "../unit_tests/wallet_config.rs"]
mod tests;