module transaction.api;

import handy_http_primitives;
import handy_http_data.json;
import handy_http_handlers.path_handler;
import slf4d;

import transaction.model;
import transaction.data;
import transaction.service;
import profile.data;
import profile.service;
import account.api;
import util.money;
import util.pagination;
import util.data;

immutable DEFAULT_TRANSACTION_PAGE = PageRequest(1, 10, [Sort("timestamp", SortDir.DESC)]);

struct TransactionsListItemAccount {
    ulong id;
    string name;
    string type;
    string numberSuffix;
}

struct TransactionsListItemVendor {
    ulong id;
    string name;
}

struct TransactionsListItemCategory {
    ulong id;
    string name;
    string color;
}

/// The transaction data provided when a list of transactions is requested.
struct TransactionsListItem {
    import asdf : serdeTransformOut;

    ulong id;
    string timestamp;
    string addedAt;
    ulong amount;
    Currency currency;
    string description;
    
    @serdeTransformOut!serializeOptional
    Optional!TransactionsListItemVendor vendor;
    @serdeTransformOut!serializeOptional
    Optional!TransactionsListItemCategory category;
    @serdeTransformOut!serializeOptional
    Optional!TransactionsListItemAccount creditedAccount;
    @serdeTransformOut!serializeOptional
    Optional!TransactionsListItemAccount debitedAccount;

    string[] tags;
}

void handleGetTransactions(ref ServerHttpRequest request, ref ServerHttpResponse response) {
    ProfileDataSource ds = getProfileDataSource(request);
    PageRequest pr = PageRequest.parse(request, DEFAULT_TRANSACTION_PAGE);
    auto responsePage = getTransactions(ds, pr);
    writeJsonBody(response, responsePage);
}

// Vendors API

void handleGetVendors(ref ServerHttpRequest request, ref ServerHttpResponse response) {
    ProfileDataSource ds = getProfileDataSource(request);
    TransactionVendor[] vendors = getAllVendors(ds);
    writeJsonBody(response, vendors);
}

void handleGetVendor(ref ServerHttpRequest request, ref ServerHttpResponse response) {
    ProfileDataSource ds = getProfileDataSource(request);
    TransactionVendor vendor = getVendor(ds, getVendorId(request));
    writeJsonBody(response, vendor);
}

struct VendorPayload {
    string name;
    string description;
}

void handleCreateVendor(ref ServerHttpRequest request, ref ServerHttpResponse response) {
    VendorPayload payload = readJsonBodyAs!VendorPayload(request);
    ProfileDataSource ds = getProfileDataSource(request);
    TransactionVendor vendor = createVendor(ds, payload);
    writeJsonBody(response, vendor);
}

void handleUpdateVendor(ref ServerHttpRequest request, ref ServerHttpResponse response) {
    VendorPayload payload = readJsonBodyAs!VendorPayload(request);
    ProfileDataSource ds = getProfileDataSource(request);
    TransactionVendor updated = updateVendor(ds, getVendorId(request), payload);
    writeJsonBody(response, updated);
}

void handleDeleteVendor(ref ServerHttpRequest request, ref ServerHttpResponse response) {
    ProfileDataSource ds = getProfileDataSource(request);
    deleteVendor(ds, getVendorId(request));
}

private ulong getVendorId(in ServerHttpRequest request) {
    return getPathParamOrThrow(request, "vendorId");
}

// Categories API