/*
* Rust-FMOD - Copyright (c) 2014 Gomez Guillaume.
*
* The Original software, FmodEx library, is provided by FIRELIGHT TECHNOLOGIES.
*
* This software is provided 'as-is', without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not claim
*    that you wrote the original software. If you use this software in a product,
*    an acknowledgment in the product documentation would be appreciated but is
*    not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
*    misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/

use types::*;
use ffi;
use channel;
use dsp;
use dsp_connection;
use libc::{c_int, c_void};
use vector;
use fmod_sys;
use fmod_sys::MemoryUsageDetails;
use std::mem::transmute;
use libc::{c_char};
use std::default::Default;

/// ChannelGroup object
pub struct ChannelGroup {
    channel_group: *mut ffi::FMOD_CHANNELGROUP,
}

impl Drop for ChannelGroup {
    fn drop(&mut self) {
        self.release();
    }
}

impl ffi::FFI<ffi::FMOD_CHANNELGROUP> for ChannelGroup {
    fn wrap(channel_group: *mut ffi::FMOD_CHANNELGROUP) -> ChannelGroup {
        ChannelGroup {channel_group: channel_group}
    }

    fn unwrap(c: &ChannelGroup) -> *mut ffi::FMOD_CHANNELGROUP {
        c.channel_group
    }
}

impl ChannelGroup {
    pub fn release(&mut self) -> ::Result {
        if !self.channel_group.is_null() {
            match unsafe { ffi::FMOD_ChannelGroup_Release(self.channel_group) } {
               ::Result::Ok => {
                    self.channel_group = ::std::ptr::null_mut();
                   ::Result::Ok
                }
                e => e
            }
        } else {
           ::Result::Ok
        }
    }

    pub fn set_volume(&self, volume: f32) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_SetVolume(self.channel_group, volume) }
    }

    pub fn get_volume(&self) -> Result<f32, ::Result> {
        let mut volume = 0f32;

        match unsafe { ffi::FMOD_ChannelGroup_GetVolume(self.channel_group, &mut volume) } {
            ::Result::Ok => Ok(volume),
            e => Err(e)
        }
    }

    pub fn set_pitch(&self, pitch: f32) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_SetPitch(self.channel_group, pitch) }
    }

    pub fn get_pitch(&self) -> Result<f32, ::Result> {
        let mut pitch = 0f32;

        match unsafe { ffi::FMOD_ChannelGroup_GetPitch(self.channel_group, &mut pitch) } {
            ::Result::Ok => Ok(pitch),
            e => Err(e)
        }
    }

    pub fn set_paused(&self, paused: bool) -> ::Result {
        let t_paused = match paused {
            true => 1,
            _ => 0
        };

        unsafe { ffi::FMOD_ChannelGroup_SetPaused(self.channel_group, t_paused) }
    }

    pub fn get_paused(&self) -> Result<bool, ::Result> {
        let mut paused = 0;

        match unsafe { ffi::FMOD_ChannelGroup_GetPaused(self.channel_group, &mut paused) } {
            ::Result::Ok => Ok(match paused {
                1 => true,
                _ => false
            }),
            e => Err(e)
        }
    }

    pub fn set_mute(&self, mute: bool) -> ::Result {
        let t_mute = match mute {
            true => 1,
            _ => 0
        };

        unsafe { ffi::FMOD_ChannelGroup_SetMute(self.channel_group, t_mute) }
    }

    pub fn get_mute(&self) -> Result<bool, ::Result> {
        let mut mute = 0;

        match unsafe { ffi::FMOD_ChannelGroup_GetMute(self.channel_group, &mut mute) } {
            ::Result::Ok => Ok(match mute {
                1 => true,
                _ => false
            }),
            e => Err(e)
        }
    }

    pub fn set_3D_occlusion(&self, direct_occlusion: f32, reverb_occlusion: f32) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_Set3DOcclusion(self.channel_group, direct_occlusion, reverb_occlusion) }
    }

    pub fn get_3D_occlusion(&self) -> Result<(f32, f32), ::Result> {
        let mut direct_occlusion = 0f32;
        let mut reverb_occlusion = 0f32;

        match unsafe { ffi::FMOD_ChannelGroup_Get3DOcclusion(self.channel_group, &mut direct_occlusion, &mut reverb_occlusion) } {
            ::Result::Ok => Ok((direct_occlusion, reverb_occlusion)),
            e => Err(e)
        }
    }

    pub fn stop(&self) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_Stop(self.channel_group) }
    }

    pub fn override_volume(&self, volume: f32) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_OverrideVolume(self.channel_group, volume) }
    }

    pub fn override_frequency(&self, frequency: f32) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_OverrideFrequency(self.channel_group, frequency) }
    }

    pub fn override_pan(&self, pan: f32) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_OverridePan(self.channel_group, pan) }
    }

    pub fn override_reverb_properties(&self, properties: &channel::ReverbChannelProperties) -> ::Result {
        let prop = ffi::FMOD_REVERB_CHANNELPROPERTIES{
            Direct: properties.direct,
            Room: properties.room,
            Flags: properties.flags,
            ConnectionPoint: ffi::FFI::unwrap(&properties.connection_point)
        };

        unsafe { ffi::FMOD_ChannelGroup_OverrideReverbProperties(self.channel_group, &prop) }
    }

    pub fn override_3D_attributes(&self, pos: &vector::Vector, vel: &vector::Vector) -> ::Result {
        let mut t_pos = vector::get_ffi(pos);
        let mut t_vel = vector::get_ffi(vel);

        unsafe { ffi::FMOD_ChannelGroup_Override3DAttributes(self.channel_group, &mut t_pos, &mut t_vel) }
    }

    pub fn override_speaker_mix(&self, front_left: f32, front_right: f32, center: f32, lfe: f32, back_left: f32, back_right: f32,
        side_left: f32, side_right: f32) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_OverrideSpeakerMix(self.channel_group, front_left, front_right, center, lfe, back_left, back_right, side_left, side_right) }
    }

    pub fn add_group(&self, group: &ChannelGroup) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_AddGroup(self.channel_group, group.channel_group) }
    }

    pub fn get_num_groups(&self) -> Result<i32, ::Result> {
        let mut index = 0i32;

        match unsafe { ffi::FMOD_ChannelGroup_GetNumGroups(self.channel_group, &mut index) } {
            ::Result::Ok => Ok(index),
            e => Err(e)
        }
    }

    pub fn get_group(&self, index: i32) -> Result<ChannelGroup, ::Result> {
        let mut group = ::std::ptr::null_mut();

        match unsafe { ffi::FMOD_ChannelGroup_GetGroup(self.channel_group, index, &mut group) } {
            ::Result::Ok => Ok(ChannelGroup{channel_group: group}),
            e => Err(e)
        }
    }

    pub fn get_parent_group(&self) -> Result<ChannelGroup, ::Result> {
        let mut parent_group = ::std::ptr::null_mut();

        match unsafe { ffi::FMOD_ChannelGroup_GetParentGroup(self.channel_group, &mut parent_group) } {
            ::Result::Ok => Ok(ChannelGroup{channel_group: parent_group}),
            e => Err(e)
        }
    }

    pub fn get_DSP_head(&self) -> Result<dsp::Dsp, ::Result> {
        let mut dsp = ::std::ptr::null_mut();

        match unsafe { ffi::FMOD_ChannelGroup_GetDSPHead(self.channel_group, &mut dsp) } {
            ::Result::Ok => Ok(ffi::FFI::wrap(dsp)),
            e => Err(e)
        }
    }

    pub fn add_DSP(&self, dsp: &dsp::Dsp) -> Result<dsp_connection::DspConnection, ::Result> {
        let mut dsp_connection = ::std::ptr::null_mut();

        match unsafe { ffi::FMOD_ChannelGroup_AddDSP(self.channel_group, ffi::FFI::unwrap(dsp), &mut dsp_connection) } {
            ::Result::Ok => Ok(ffi::FFI::wrap(dsp_connection)),
            e => Err(e)
        }
    }

    pub fn get_name(&self, name_len: usize) -> Result<String, ::Result> {
        let mut c = Vec::with_capacity(name_len + 1);

        for _ in 0..(name_len + 1) {
            c.push(0);
        }

        match unsafe { ffi::FMOD_ChannelGroup_GetName(self.channel_group, c.as_mut_ptr() as *mut c_char, name_len as i32) } {
            ::Result::Ok => Ok(String::from_utf8(c).unwrap()),
            e => Err(e)
        }
    }

    pub fn get_num_channels(&self) -> Result<u32, ::Result> {
        let mut num_channels = 0i32;

        match unsafe { ffi::FMOD_ChannelGroup_GetNumChannels(self.channel_group, &mut num_channels) } {
            ::Result::Ok => Ok(num_channels as u32),
            e => Err(e)
        }
    }

    pub fn get_channel(&self, index: i32) -> Result<channel::Channel, ::Result> {
        let mut channel = ::std::ptr::null_mut();

        match unsafe { ffi::FMOD_ChannelGroup_GetChannel(self.channel_group, index, &mut channel) } {
            ::Result::Ok => Ok(ffi::FFI::wrap(channel)),
            e => Err(e)
        }
    }

    pub fn get_spectrum(&self, spectrum_size: usize, channel_offset: Option<i32>, window_type: Option<::DspFftWindow>) -> Result<Vec<f32>, ::Result> {
        let mut ptr : Vec<f32> = ::std::iter::repeat(0f32).take(spectrum_size).collect();
        let c_window_type = match window_type {
            Some(wt) => wt,
            None => ::DspFftWindow::Rect
        };
        let c_channel_offset = match channel_offset {
            Some(co) => co,
            None => 0i32
        };

        match unsafe { ffi::FMOD_ChannelGroup_GetSpectrum(self.channel_group, ptr.as_mut_ptr(), spectrum_size as c_int, c_channel_offset, c_window_type) } {
            ::Result::Ok => Ok(ptr),
            e => Err(e),
        }
    }

    pub fn get_wave_data(&self, wave_size: usize, channel_offset: i32) -> Result<Vec<f32>, ::Result> {
        let mut ptr : Vec<f32> = ::std::iter::repeat(0f32).take(wave_size).collect();

        match unsafe { ffi::FMOD_ChannelGroup_GetWaveData(self.channel_group, ptr.as_mut_ptr(), wave_size as c_int, channel_offset) } {
            ::Result::Ok => Ok(ptr),
            e => Err(e)
        }
    }

    pub fn get_memory_info(&self, MemoryBits(memory_bits): MemoryBits,
        EventMemoryBits(event_memory_bits): EventMemoryBits) -> Result<(u32, MemoryUsageDetails), ::Result> {
        let mut details = fmod_sys::get_memory_usage_details_ffi(Default::default());
        let mut memory_used = 0u32;

        match unsafe { ffi::FMOD_ChannelGroup_GetMemoryInfo(self.channel_group, memory_bits, event_memory_bits, &mut memory_used, &mut details) } {
            ::Result::Ok => Ok((memory_used, fmod_sys::from_memory_usage_details_ptr(details))),
            e => Err(e)
        }
    }

    pub fn set_user_data<T>(&self, user_data: &mut T) -> ::Result {
        unsafe { ffi::FMOD_ChannelGroup_SetUserData(self.channel_group, transmute(user_data)) }
    }

    pub fn get_user_data<'r, T>(&'r self) -> Result<&'r mut T, ::Result> {
        unsafe {
            let mut user_data : *mut c_void = ::std::ptr::null_mut();

            match ffi::FMOD_ChannelGroup_GetUserData(self.channel_group, &mut user_data) {
               ::Result::Ok => {
                    let tmp : &mut T = transmute::<*mut c_void, &mut T>(user_data);
                    
                    Ok(tmp)
                },
                e => Err(e)
            }
        }
    }
}