#pragma once

#include "lite_client_bridge.h"
#include "lite_connection_service.h"
#include "lite_result_parsers.h"
#include "lite_sync_service.h"
#include "wallet_backend.h"
#include "wallet_capabilities.h"

#include <cstddef>
#include <functional>
#include <string>
#include <vector>

namespace dragonx::wallet {

enum class LiteWalletGatewayCommand {
    Info,
    Height,
    Balance,
    Addresses,
    Notes,
    List,
};

enum class LiteWalletGatewayAvailability {
    Ready,
    UnsupportedBuild,
    BackendUnavailable,
    BridgeUnavailable,
    BridgeCallsDisabled,
    NoUsableServer,
};

struct LiteWalletGatewayRequest {
    LiteWalletGatewayCommand command = LiteWalletGatewayCommand::Info;
    std::string serverUrl;
};

struct LiteWalletGatewayPlan {
    bool ok = false;
    LiteWalletGatewayCommand command = LiteWalletGatewayCommand::Info;
    LiteServerEndpoint server;
    std::size_t serverIndex = 0;
    bool customServer = false;
    bool bridgeExecutionAllowed = false;
    std::string commandName;
    std::string args;
    std::string error;
};

struct LiteWalletGatewayCommandResult {
    bool ok = false;
    bool attempted = false;
    bool bridgeAccepted = false;
    LiteWalletGatewayPlan plan;
    LiteResultParserError parserError = LiteResultParserError::None;
    bool backendError = false;   // bridge call failed, or the reply was not JSON (the backend's plain-text sync error)
    WalletBackendStatus status;
    std::string bridgeResponseRedacted = "<empty>";
    std::string error;

    LiteInfoResponse info;
    LiteHeightResponse height;
    LiteBalanceResponse balance;
    LiteAddressesResponse addresses;
    LiteNotesResponse notes;
    LiteTransactionsResponse transactions;
};

struct LiteWalletRefreshRequest {
    std::string serverUrl;
    bool includeInfo = true;
    bool includeHeight = true;
    bool includeBalance = true;
    bool includeAddresses = true;
    bool includeNotes = true;
    bool includeTransactions = true;
    bool haveSyncStatus = false;
    LiteSyncStatusResponse syncStatus;
    // Optional cooperative cancel, consulted before every backend command; returning false ends the refresh early
    // (result.cancelled, model discarded by the caller).
    std::function<bool()> keepGoing;
    // Skip the remaining server-bound commands (info/balance/notes/list) once one returned a backend error: each
    // `balance`/`notes`/`list` runs do_sync, which costs ~62 s of retry back-off against a refusing server.
    bool stopSyncReadsOnFailure = false;
};

struct LiteWalletRefreshPlan {
    bool ok = false;
    std::vector<LiteWalletGatewayPlan> commands;
    std::string error;
};

struct LiteWalletRefreshBundle {
    bool hasInfo = false;
    bool hasHeight = false;
    bool hasBalance = false;
    bool hasAddresses = false;
    bool hasNotes = false;
    bool hasTransactions = false;
    bool hasSyncStatus = false;
    bool complete = false;
    std::size_t successfulCommandCount = 0;

    LiteInfoResponse info;
    LiteHeightResponse height;
    LiteBalanceResponse balance;
    LiteAddressesResponse addresses;
    LiteNotesResponse notes;
    LiteTransactionsResponse transactions;
    LiteSyncStatusResponse syncStatus;
};

struct LiteWalletRefreshResult {
    bool ok = false;
    bool attempted = false;
    bool cancelled = false;        // keepGoing() returned false; partial results only
    bool syncReadFailed = false;   // a server-bound command returned a backend error this cycle
    LiteWalletRefreshPlan plan;
    std::vector<LiteWalletGatewayCommandResult> commandResults;
    LiteWalletRefreshBundle bundle;
    WalletBackendStatus status;
    std::string error;
};

struct LiteWalletGatewayOptions {
    bool allowBridgeCalls = false;
};

const char* liteWalletGatewayCommandName(LiteWalletGatewayCommand command);
// Pure helpers (unit-tested).
bool liteResponseIsBackendError(const std::string& response);           // first non-space char is neither '{' nor '['
bool liteGatewayCommandReachesServer(LiteWalletGatewayCommand command);  // Info/Balance/Notes/List; Height/Addresses are local
int  liteRefreshDelayMs(int consecutiveFailures, int baseMs);           // base, x2 per failure, capped at 15000 ms
const char* liteWalletGatewayAvailabilityName(LiteWalletGatewayAvailability availability);

std::vector<LiteWalletGatewayCommand> liteWalletRefreshCommands(const LiteWalletRefreshRequest& request);
LiteWalletRefreshBundle assembleLiteWalletRefreshBundle(const std::vector<LiteWalletGatewayCommandResult>& results,
                                                        const LiteWalletRefreshRequest& request);

class LiteWalletGateway {
public:
    LiteWalletGateway(WalletCapabilities capabilities,
                      LiteConnectionSettings connectionSettings,
                      LiteClientBridge* bridge,
                      LiteWalletGatewayOptions options = {});

    const WalletCapabilities& capabilities() const { return capabilities_; }
    const LiteConnectionSettings& connectionSettings() const { return connectionSettings_; }
    const LiteWalletGatewayOptions& options() const { return options_; }

    LiteWalletGatewayAvailability availability() const;
    WalletBackendStatus status() const;

    LiteWalletGatewayPlan planCommand(const LiteWalletGatewayRequest& request) const;
    LiteWalletRefreshPlan planRefresh(const LiteWalletRefreshRequest& request) const;
    LiteWalletGatewayCommandResult fetchCommand(const LiteWalletGatewayRequest& request);
    LiteWalletRefreshResult refresh(const LiteWalletRefreshRequest& request);

private:
    LiteServerSelectionResult selectServerForRequest(const std::string& serverUrl) const;
    WalletBackendStatus statusFor(LiteWalletGatewayAvailability availability,
                                  const std::string& detail = {}) const;
    LiteWalletGatewayCommandResult blockedCommandResult(const LiteWalletGatewayPlan& plan,
                                                        const WalletBackendStatus& blockedStatus) const;
    LiteWalletGatewayCommandResult executePlannedCommand(const LiteWalletGatewayPlan& plan);
    LiteWalletGatewayCommandResult parseBridgeResponse(const LiteWalletGatewayPlan& plan,
                                                       const std::string& response) const;

    WalletCapabilities capabilities_;
    LiteConnectionSettings connectionSettings_;
    LiteClientBridge* bridge_ = nullptr;  // non-owning; owned by LiteWalletController
    LiteWalletGatewayOptions options_;
};

} // namespace dragonx::wallet