const std = @import("std");
const c = @cImport({
    @cInclude("sqlite3.h");
});

const ZBoardDB = struct {
    db: *c.sqlite3,

    pub fn init() !ZBoardDB {
        var c_db: ?*c.sqlite3 = undefined;
        if (c.SQLITE_OK != c.sqlite3_open(":memory:", &c_db)) {
            return error.DBInitError;
        }

        const db: ZBoardDB = .{ .db = c_db };

        try db.execute(
            \\ CREATE TABLE IF NOT EXISTS users (
            \\    id INTEGER PRIMARY KEY,
            \\    name VARCHAR(255) NOT NULL UNIQUE
            \\ );
            \\ CREATE TABLE IF NOT EXISTS topics (
            \\    id INTEGER PRIMARY KEY,
            \\    topic VARCHAR(255) NOT NULL UNIQUE,
            \\    user_id INTEGER NOT NULL REFERENCES users(id)
            \\ );
            \\    id INTEGER PRIMARY KEY,
            \\    title VARCHAR(255) NOT NULL UNIQUE,
            \\    topic_id INTEGER NOT NULL REFERENCES topics(id),
            \\    user_id INTEGER NOT NULL REFERENCES users(id)
            \\ );
            \\ CREATE TABLE IF NOT EXISTS posts (
            \\    id INTEGER PRIMARY KEY,
            \\    content TEXT NOT NULL,
            \\    thread_id INTEGER NOT NULL REFERENCES threads(id),
            \\    user_id INTEGER NOT NULL REFERENCES users(id),
            \\    epoch INTEGER NOT NULL
            \\ );
        );

        return db;
    }

    pub fn deinit(self: ZBoardDB) !void {
        _ = c.sqlite3_close(self.db);
    }

    fn execute(self: ZBoardDB, query: [:0]const u8) !void {
        var errmsg: [*c]u8 = undefined;
        if (c.SQLITE_OK != c.sqlite3_exec(self.db, query, null, null, &errmsg)) {
            defer c.sqlite3_free(errmsg);
            std.debug.print("Exec query failed: {s}\n", .{errmsg});
            return error.execError;
        }
        return;
    }

    fn getCurrentUser() !void {}

    fn createUser() !void {}
    fn deleteUser() !void {}

    fn createTopic() !void {}
    fn deleteTopic() !void {}

    fn createThread() !void {}
    fn deleteThread() !void {}

    fn createPost() !void {}
    fn deletePost() !void {}

    fn getTopics() !void {}
    fn getThreadsByTopic() !void {}
    fn getPostsByThread() !void {}
};