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use std::ffi::{CString, CStr};
use std::ptr;
use std::thread::sleep;
use std::time::Duration;
use libc::c_void;

use jack_sys::*;

use port::*;
use callbacks::{JackControl, JackHandler, register_callbacks};
use error::{ClientStatus, JackErr};

pub enum ClientOption {
    SessionID,
    ServerName,
    NoStartServer,
    UseExactName,
    FreeWheel
}

impl ClientOption {
    fn as_u32(&self) -> u32 {
        match *self {
            ClientOption::SessionID => JackSessionID,
            ClientOption::ServerName => JackServerName,
            ClientOption::NoStartServer => JackNoStartServer,
            ClientOption::UseExactName => JackUseExactName,
            _ => 0
        }
    }
}

pub struct JackClient<T: JackHandler>
{
    client_name: Option<String>,
    handler: Option<*mut T>,
    options: u32,
    client: Option<*mut jack_client_t>,
    freewheel: bool
}

impl<T: JackHandler> JackClient<T>
{
    pub fn new() -> JackClient<T>
    {
        JackClient { client_name: None, handler: None, options: 0, client: None, freewheel: false }
    }

    pub fn name<'b>(mut self, name: &'b str) -> JackClient<T> {
        self.client_name = Some(name.into());
        self
    }

    pub fn get_name(&mut self) -> Option<String> {
        self.client_name.clone()
    }

    pub fn option(mut self, option: ClientOption) -> JackClient<T> {
        match option {
            ClientOption::FreeWheel => self.freewheel = true,
            _ => self.options = self.options|option.as_u32()
        }

        self
    }

    pub fn buffer_size(&mut self, nframes: u32) {
        unsafe { jack_set_buffer_size(self.client.expect("Cannot change buffer_size!"), nframes); }
    }

    pub fn get_buffer_size(&mut self) -> u32{
        unsafe { jack_get_buffer_size(self.client.expect("Client not connected!")) }
    }

    pub fn get_sample_rate(&mut self) -> u32 {
        unsafe { jack_get_sample_rate(self.client.unwrap()) }
    }

    pub fn get_cpu_load(&mut self) -> f32 {
        unsafe { jack_cpu_load(self.client.unwrap()) }
    }

    pub fn connect(mut self) -> Result<JackClient<T>, ClientStatus> {
        let c_name = {
            let name = match self.client_name {
                Some(ref name) => name.as_str(),
                None => "unknown_client"
            };
       
            CString::new(name).unwrap_or(CString::new("unknown_client").unwrap())
        };
      
        let i: jack_status_t = 0;
        let client: *mut jack_client_t;
            
        unsafe {
            client = jack_client_open(c_name.as_ptr(), self.options, i as *mut jack_status_t);
            if client.is_null() {
                return Err(ClientStatus(i));
            }

            if self.freewheel {
                jack_set_freewheel(client, 1);
            } else {
                jack_set_freewheel(client, 0);
            }
        }


        self.client = Some(client);

        Ok(self)
    }

    pub fn new_port(&self) -> JackPort {
        JackPort::new(self.client.expect("Error: client is no connected!"))
    }

    pub fn activate(&mut self, mut handler_obj: T) -> Result<*mut T, ()> {
        let client = self.client.expect("Error: Client is not connected!");

        let handler = unsafe { register_callbacks(client, handler_obj).unwrap() };

        unsafe {
            if jack_activate(client) == 1 {
                return Err(());
            }
        }

        unsafe { (*handler).activated(self); }

        self.handler = Some(handler);

        Ok(handler)
    }

    pub fn search(&mut self) -> PortIterator {
        PortIterator::new(self.client.unwrap())
    }
}

impl<T: JackHandler> Drop for JackClient<T> {
    fn drop(&mut self) {
        if let Some(client) = self.client {
            unsafe {
                jack_client_close(client);
            }
        }
    }
}

pub struct PortIterator {
    client: *mut jack_client_t,
    ports: *mut *const i8,
    idx: isize
}

impl PortIterator {
    pub fn new(client: *mut jack_client_t) -> PortIterator {
        let ports: *mut *const i8 = unsafe {
            jack_get_ports(client, ptr::null(), ptr::null(), 0)
        };

        let mut idx = 0;
        if ports == ptr::null_mut() {
            // search has failed, yield None
            idx = -1;
        }

        PortIterator { client: client,ports: ports, idx: idx }
    }
}

impl<'a> Iterator for PortIterator {
    type Item = JackPort;

    fn next(&mut self) -> Option<Self::Item> {
        if self.idx == -1 {
            return None;
        }

        let name = unsafe {
            let maybe_str = ptr::read(self.ports.offset(self.idx));
            
            if maybe_str.is_null() {
                self.idx = -1;
                return None;
            }

            CStr::from_ptr(maybe_str as *mut i8).to_str()
        };
        
        match name {
            Ok(name) => {
                self.idx += 1;
                JackPort::from_name(self.client, name)
            },
            Err(_) => {
                self.idx = -1;
                None
            }
        }
    }
}