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/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>

#include "server.h"

sqlite3 *db;
struct Statements stmt;

static void prepare(sqlite3_stmt **stmt, const char *query) {
	int error = sqlite3_prepare_v3(
		db, query, -1, SQLITE_PREPARE_PERSISTENT, stmt, NULL
	);
	if (error) errx(EX_SOFTWARE, "%s: %s", sqlite3_errmsg(db), query);
}

const char *Pages[PagesLen] = {
#define X(page, path) [page] = path,
	ENUM_PAGES
#undef X
};

const struct kvalid Keys[KeysLen] = {
#define X(key, name, valid) [key] = { valid, name },
	ENUM_KEYS
#undef X
};

bool pagePublic;
int pageLimit = 100;

static const char CSS[] = {
#include "default.css.h"
};
static const char *Cache = "public, max-age=86400, immutable";

static enum kcgi_err request(struct kreq *req) {
	if (req->method != KMETHOD_HEAD && req->method != KMETHOD_GET) {
		return httpFail(req, KHTTP_405);
	}
	switch (req->page) {
		case Networks: return pageNetworks(req);
		case Contexts: return pageContexts(req);
		case Events:   return pageEvents(req);
		case Search:   return pageSearch(req);
		case Stylesheet: {
			if (req->mime != KMIME_TEXT_CSS) return httpFail(req, KHTTP_404);
			return httpHead(req, KHTTP_200, KMIME_TEXT_CSS)
				|| khttp_head(req, kresps[KRESP_CACHE_CONTROL], "%s", Cache)
				|| khttp_body(req)
				|| khttp_write(req, CSS, sizeof(CSS));
		}
		default: return httpFail(req, KHTTP_404);
	}
}

int main(int argc, char *argv[]) {
	bool fastCGI = false;
	bool test = false;

	for (int opt; 0 < (opt = getopt(argc, argv, "cfps:"));) {
		switch (opt) {
			break; case 'c': test = true;
			break; case 'f': fastCGI = true;
			break; case 'p': pagePublic = true;
			break; case 's': htmlStylesheet = optarg;
			break; default:  return EX_USAGE;
		}
	}
	if (optind == argc) errx(EX_USAGE, "database path required");

	int error = sqlite3_open_v2(argv[optind], &db, SQLITE_OPEN_READONLY, NULL);
	if (error) errx(EX_NOINPUT, "%s: %s", argv[optind], sqlite3_errmsg(db));
	atexit(dbClose);

	sqlite3_stmt *check;
	error = sqlite3_prepare_v2(
		db, SQL(PRAGMA user_version;), -1, &check, NULL
	);
	if (error) errx(EX_SOFTWARE, "%s", sqlite3_errmsg(db));

	error = sqlite3_step(check);
	if (error != SQLITE_ROW) errx(EX_SOFTWARE, "%s", sqlite3_errmsg(db));

	int version = sqlite3_column_int(check, 0);
	if (version != DatabaseVersion) {
		errx(EX_DATAERR, "unsupported database version %d", version);
	}
	sqlite3_finalize(check);

	prepare(&stmt.networks, NetworksQuery);
	prepare(&stmt.contexts, ContextsQuery);
	prepare(&stmt.eventsAfter, EventsAfterQuery);
	prepare(&stmt.eventsBefore, EventsBeforeQuery);
	
	if (test) return EX_OK;
	
	if (fastCGI) {
		struct kfcgi *fcgi;
		enum kcgi_err error = khttp_fcgi_init(
			&fcgi, Keys, KeysLen, Pages, PagesLen, Networks
		);
		if (error) errx(EX_CONFIG, "khttp_fcgi_init: %s", kcgi_strerror(error));
		for (
			struct kreq req;
			KCGI_OK == (error = khttp_fcgi_parse(fcgi, &req));
			khttp_free(&req)
		) {
			error = request(&req);
			if (error && error != KCGI_HUP) break;
		}
		errx(EX_PROTOCOL, "khttp_fcgi_parse: %s", kcgi_strerror(error));
	} else {
		struct kreq req;
		enum kcgi_err error = khttp_parse(
			&req, Keys, KeysLen, Pages, PagesLen, Networks
		);
		if (error) errx(EX_PROTOCOL, "khttp_parse: %s", kcgi_strerror(error));
		error = request(&req);
		if (error) errx(EX_PROTOCOL, "%s", kcgi_strerror(error));
		khttp_free(&req);
	}
}