module profile.data_impl_sqlite;

import slf4d;
import handy_httpd.components.optional;
import handy_httpd.components.handler : HttpStatusException;
import handy_httpd.components.response : HttpStatus;
import d2sqlite3;

import profile.data;
import profile.model;
import util.sqlite;

const DEFAULT_USERS_DIR = "users";

/// Profile repository that uses an SQLite3 database file for each profile.
class FileSystemProfileRepository : ProfileRepository {
    import std.path;
    import std.file;

    private const string usersDir;
    private const string username;

    this(string usersDir, string username) {
        this.usersDir = usersDir;
        this.username = username;
    }

    this(string username) {
        this(DEFAULT_USERS_DIR, username);
    }

    Optional!Profile findByName(string name) {
        string path = getProfilePath(name);
        if (!exists(path)) return Optional!Profile.empty;
        return Optional!Profile.of(new Profile(name));
    }

    Profile createProfile(string name) {
        string path = getProfilePath(name);
        if (exists(path)) throw new HttpStatusException(HttpStatus.BAD_REQUEST, "Profile already exists.");
        if (!exists(getProfilesDir())) mkdir(getProfilesDir());
        ProfileDataSource ds = new SqliteProfileDataSource(path);
        import std.datetime;
        auto propsRepo = ds.getPropertiesRepository();
        propsRepo.setProperty("name", name);
        propsRepo.setProperty("createdAt", Clock.currTime(UTC()).toISOExtString());
        propsRepo.setProperty("user", username);
        return new Profile(name);
    }

    Profile[] findAll() {
        string profilesDir = getProfilesDir();
        if (!exists(profilesDir)) return [];
        Profile[] profiles;
        foreach (DirEntry entry; dirEntries(profilesDir, SpanMode.shallow, false)) {
            import std.string : endsWith;
            const suffix = ".sqlite";
            if (endsWith(entry.name, suffix)) {
                string profileName = baseName(entry.name, suffix);
                profiles ~= new Profile(profileName);
            }
        }
        import std.algorithm.sorting : sort;
        sort(profiles);
        return profiles;
    }

    void deleteByName(string name) {
        string path = getProfilePath(name);
        if (exists(path)) {
            std.file.remove(path);
        }
    }

    ProfileDataSource getDataSource(in Profile profile) {
        return new SqliteProfileDataSource(getProfilePath(profile.name));
    }

    private string getProfilesDir() {
        return buildPath(this.usersDir, username, "profiles");
    }

    private string getProfilePath(string name) {
        return buildPath(this.usersDir, username, "profiles", name ~ ".sqlite");
    }
}

class SqlitePropertiesRepository : PropertiesRepository {
    private Database db;
    this(Database db) {
        this.db = db;
    }

    Optional!string findProperty(string propertyName) {
        return findOne(
            db,
            "SELECT value FROM profile_property WHERE property = ?",
            r => r.peek!string(0),
            propertyName
        );
    }

    void setProperty(string name, string value) {
        if (findProperty(name).isNull) {
            Statement stmt = this.db.prepare("INSERT INTO profile_property (property, value) VALUES (?, ?)");
            stmt.bind(1, name);
            stmt.bind(2, value);
            stmt.execute();
        } else {
            Statement stmt = this.db.prepare("UPDATE profile_property SET value = ? WHERE property = ?");
            stmt.bind(1, value);
            stmt.bind(2, name);
            stmt.execute();
        }
    }

    void deleteProperty(string name) {
        Statement stmt = this.db.prepare("DELETE FROM profile_property WHERE property = ?");
        stmt.bind(1, name);
        stmt.execute();
    }

    ProfileProperty[] findAll() {
        Statement stmt = this.db.prepare("SELECT * FROM profile_property ORDER BY property ASC");
        ResultRange result = stmt.execute();
        ProfileProperty[] props;
        foreach (Row row; result) {
            ProfileProperty prop;
            prop.property = row.peek!string("property");
            prop.value = row.peek!string("value");
            props ~= prop;
        }
        return props;
    }
}

/**
 * An SQLite implementation of the ProfileDataSource that uses a single
 * database connection to initialize various entity data access objects lazily.
 */
class SqliteProfileDataSource : ProfileDataSource {
    import account.data;
    import account.data_impl_sqlite;

    const SCHEMA = import("schema.sql");
    private const string dbPath;
    private Database db;

    this(string path) {
        this.dbPath = path;
        import std.file : exists;
        bool needsInit = !exists(path);
        this.db = Database(path);
        if (needsInit) {
            infoF!"Initializing database: %s"(dbPath);
            db.run(SCHEMA);
        }
    }

    PropertiesRepository getPropertiesRepository() {
        return new SqlitePropertiesRepository(db);
    }

    AccountRepository getAccountRepository() {
        return new SqliteAccountRepository(db);
    }
}