module transaction.api;

import handy_httpd;

import transaction.model;
import transaction.data;
import transaction.service;
import profile.data;
import profile.service;
import util.json;
import util.money;
import util.pagination;

immutable DEFAULT_TRANSACTION_PAGE = PageRequest(0, 10, [Sort("created_at", SortDir.DESC)]);

void getTransactions(ref HttpRequestContext ctx) {
    ProfileDataSource ds = getProfileDataSource(ctx);
    PageRequest pr = PageRequest.parse(ctx, DEFAULT_TRANSACTION_PAGE);
    Page!Transaction page = searchTransactions(ds, pr);
}

void getVendors(ref HttpRequestContext ctx) {
    ProfileDataSource ds = getProfileDataSource(ctx);
    auto vendorRepo = ds.getTransactionVendorRepository();
    TransactionVendor[] vendors = vendorRepo.findAll();
    writeJsonBody(ctx, vendors);
}

void getVendor(ref HttpRequestContext ctx) {
    long vendorId = ctx.request.getPathParamAs!long("vendorId", -1);
    if (vendorId == -1) {
        ctx.response.status = HttpStatus.NOT_FOUND;
        ctx.response.writeBodyString("Missing vendorId path parameter.");
        return;
    }
    ProfileDataSource ds = getProfileDataSource(ctx);
    auto vendorRepo = ds.getTransactionVendorRepository();
    TransactionVendor vendor = vendorRepo.findById(vendorId)
        .orElseThrow(() => new HttpStatusException(HttpStatus.NOT_FOUND));
    writeJsonBody(ctx, vendor);
}

struct VendorPayload {
    string name;
    string description;
}

void createVendor(ref HttpRequestContext ctx) {
    VendorPayload payload = readJsonPayload!VendorPayload(ctx);
    ProfileDataSource ds = getProfileDataSource(ctx);
    auto vendorRepo = ds.getTransactionVendorRepository();
    if (vendorRepo.existsByName(payload.name)) {
        ctx.response.status = HttpStatus.BAD_REQUEST;
        ctx.response.writeBodyString("Vendor name is already in use.");
        return;
    }
    TransactionVendor vendor = vendorRepo.insert(payload.name, payload.description);
    writeJsonBody(ctx, vendor);
}

void updateVendor(ref HttpRequestContext ctx) {
    VendorPayload payload = readJsonPayload!VendorPayload(ctx);
    long vendorId = ctx.request.getPathParamAs!long("vendorId", -1);
    if (vendorId == -1) {
        ctx.response.status = HttpStatus.NOT_FOUND;
        ctx.response.writeBodyString("Missing vendorId path parameter.");
        return;
    }
    ProfileDataSource ds = getProfileDataSource(ctx);
    auto vendorRepo = ds.getTransactionVendorRepository();
    TransactionVendor existingVendor = vendorRepo.findById(vendorId)
        .orElseThrow(() => new HttpStatusException(HttpStatus.NOT_FOUND));
    if (payload.name != existingVendor.name && vendorRepo.existsByName(payload.name)) {
        ctx.response.status = HttpStatus.BAD_REQUEST;
        ctx.response.writeBodyString("Vendor name is already in use.");
    }
    TransactionVendor updated = vendorRepo.updateById(
        vendorId,
        payload.name,
        payload.description
    );
    writeJsonBody(ctx, updated);
}

void deleteVendor(ref HttpRequestContext ctx) {
    long vendorId = ctx.request.getPathParamAs!long("vendorId", -1);
    if (vendorId == -1) {
        ctx.response.status = HttpStatus.NOT_FOUND;
        ctx.response.writeBodyString("Missing vendorId path parameter.");
        return;
    }
    ProfileDataSource ds = getProfileDataSource(ctx);
    auto vendorRepo = ds.getTransactionVendorRepository();
    vendorRepo.deleteById(vendorId);
}