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// Copyright 2021 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::{fmt, time::Duration};

use matrix_sdk_common::debug::DebugStructExt;
use ruma::{api::client::sync::sync_events, presence::PresenceState};

const DEFAULT_SYNC_TIMEOUT: Duration = Duration::from_secs(30);

/// Settings for a sync call.
#[derive(Clone)]
pub struct SyncSettings {
    // Filter is pretty big at 1000 bytes, box it to reduce stack size
    pub(crate) filter: Option<Box<sync_events::v3::Filter>>,
    pub(crate) timeout: Option<Duration>,
    pub(crate) token: Option<String>,
    pub(crate) full_state: bool,
    pub(crate) set_presence: PresenceState,
}

impl Default for SyncSettings {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(not(tarpaulin_include))]
impl fmt::Debug for SyncSettings {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let Self { filter, timeout, token: _, full_state, set_presence } = self;
        f.debug_struct("SyncSettings")
            .maybe_field("filter", filter)
            .maybe_field("timeout", timeout)
            .field("full_state", full_state)
            .field("set_presence", set_presence)
            .finish()
    }
}

impl SyncSettings {
    /// Create new default sync settings.
    #[must_use]
    pub fn new() -> Self {
        Self {
            filter: None,
            timeout: Some(DEFAULT_SYNC_TIMEOUT),
            token: None,
            full_state: false,
            set_presence: PresenceState::Online,
        }
    }

    /// Set the sync token.
    ///
    /// # Arguments
    ///
    /// * `token` - The sync token that should be used for the sync call.
    #[must_use]
    pub fn token(mut self, token: impl Into<String>) -> Self {
        self.token = Some(token.into());
        self
    }

    /// Set the maximum time the server can wait, in milliseconds, before
    /// responding to the sync request.
    ///
    /// # Arguments
    ///
    /// * `timeout` - The time the server is allowed to wait.
    #[must_use]
    pub fn timeout(mut self, timeout: Duration) -> Self {
        self.timeout = Some(timeout);
        self
    }

    /// Set the sync filter.
    /// It can be either the filter ID, or the definition for the filter.
    ///
    /// # Arguments
    ///
    /// * `filter` - The filter configuration that should be used for the sync
    ///   call.
    #[must_use]
    pub fn filter(mut self, filter: sync_events::v3::Filter) -> Self {
        self.filter = Some(Box::new(filter));
        self
    }

    /// Should the server return the full state from the start of the timeline.
    ///
    /// This does nothing if no sync token is set.
    ///
    /// # Arguments
    /// * `full_state` - A boolean deciding if the server should return the full
    ///   state or not.
    #[must_use]
    pub fn full_state(mut self, full_state: bool) -> Self {
        self.full_state = full_state;
        self
    }

    /// Set the presence state
    ///
    /// `PresenceState::Online` - The client is marked as being online. This is
    /// the default preset.
    ///
    /// `PresenceState::Offline` - The client is not marked as being online.
    ///
    /// `PresenceState::Unavailable` - The client is marked as being idle.
    ///
    /// # Arguments
    /// * `set_presence` - The `PresenceState` that the server should set for
    ///   the client.
    #[must_use]
    pub fn set_presence(mut self, presence: PresenceState) -> Self {
        self.set_presence = presence;
        self
    }
}