// Copyright (c) 2017 mimir developers
//
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. All files in the project carrying such notice may not be copied,
// modified, or distributed except according to those terms.

//! Dequeue option handles are used to represent the options specified when dequeuing messages using
//! advanced queueing. They are created by calling the function `Connection::new_deq_ptions()` and
//! are destroyed by releasing the last reference by calling the function
//! `dequeue::Options::release()`.
use error::{ErrorKind, Result};
use odpi::{enums, externs};
use odpi::opaque::ODPIDeqOptions;
use std::ptr;
use util::ODPIStr;

/// Dequeue option handles are used to represent the options specified when dequeuing messages using
/// advanced queueing.
#[derive(Clone)]
pub struct Options {
    /// The ODPI-C DeqOptions pointer.
    inner: *mut ODPIDeqOptions,
}

impl Options {
    /// Get the `inner` value.
    #[doc(hidden)]
    pub fn inner(&self) -> *mut ODPIDeqOptions {
        self.inner
    }

    /// Adds a reference to the dequeue options. This is intended for situations where a reference
    /// to the dequeue options needs to be maintained independently of the reference returned when
    /// the handle was created.
    pub fn add_ref(&self) -> Result<()> {
        try_dpi!(
            externs::dpiDeqOptions_addRef(self.inner),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_addRef".to_string())
        )
    }

    /// Returns the condition that must be satisfied in order for a message to be dequeued. See
    /// function `dequeue::Options::set_condition()` for more information.
    pub fn get_condition(&self) -> Result<String> {
        let mut res = ptr::null();
        let mut res_len = 0;

        try_dpi!(
            externs::dpiDeqOptions_getCondition(self.inner, &mut res, &mut res_len),
            {
                let cond = if res.is_null() {
                    "".to_string()
                } else {
                    let res_s = ODPIStr::new(res, res_len);
                    res_s.into()
                };
                Ok(cond)
            },
            ErrorKind::DeqOptions("dpiDeqOptions_getCondition".to_string())
        )
    }

    /// Returns the name of the consumer that is dequeuing messages. See function
    /// `dequeue::Options::set_consumer_name()` for more information.
    pub fn get_consumer_name(&self) -> Result<String> {
        let mut res = ptr::null();
        let mut res_len = 0;

        try_dpi!(
            externs::dpiDeqOptions_getConsumerName(self.inner, &mut res, &mut res_len),
            {
                let consumer_name = if res.is_null() {
                    "".to_string()
                } else {
                    let res_s = ODPIStr::new(res, res_len);
                    res_s.into()
                };
                Ok(consumer_name)
            },
            ErrorKind::DeqOptions("dpiDeqOptions_getConsumerName".to_string())
        )
    }

    /// Returns the correlation of the message to be dequeued. See function
    /// `dequeue::Options::set_correlation()` for more information.
    pub fn get_correlation(&self) -> Result<String> {
        let mut res = ptr::null();
        let mut res_len = 0;

        try_dpi!(
            externs::dpiDeqOptions_getCorrelation(self.inner, &mut res, &mut res_len),
            {
                let correlation = if res.is_null() {
                    "".to_string()
                } else {
                    let res_s = ODPIStr::new(res, res_len);
                    res_s.into()
                };
                Ok(correlation)
            },
            ErrorKind::DeqOptions("dpiDeqOptions_getCorrelation".to_string())
        )
    }

    /// Returns the mode that is to be used when dequeuing messages.
    pub fn get_mode(&self) -> Result<enums::ODPIDeqMode> {
        let mut deq_mod_ptr = enums::ODPIDeqMode::Remove;

        try_dpi!(
            externs::dpiDeqOptions_getMode(self.inner, &mut deq_mod_ptr),
            Ok(deq_mod_ptr),
            ErrorKind::DeqOptions("dpiDeqOptions_getMode".to_string())
        )
    }

    /// Returns the identifier of the specific message that is to be dequeued.
    pub fn get_msg_id(&self) -> Result<String> {
        let mut res = ptr::null();
        let mut res_len = 0;

        try_dpi!(
            externs::dpiDeqOptions_getMsgId(self.inner, &mut res, &mut res_len),
            {
                let msg_id = if res.is_null() {
                    "".to_string()
                } else {
                    let res_s = ODPIStr::new(res, res_len);
                    res_s.into()
                };
                Ok(msg_id)
            },
            ErrorKind::DeqOptions("dpiDeqOptions_getMsgId".to_string())
        )
    }

    /// Returns the position of the message that is to be dequeued.
    pub fn get_navigation(&self) -> Result<enums::ODPIDeqNavigation> {
        let mut nav = enums::ODPIDeqNavigation::NextMsg;

        try_dpi!(
            externs::dpiDeqOptions_getNavigation(self.inner, &mut nav),
            Ok(nav),
            ErrorKind::DeqOptions("dpiDeqOptions_getNavigation".to_string())
        )
    }


    /// Returns the transformation of the message to be dequeued. See function
    /// `dequeue::Options::set_transformation()` for more information.
    pub fn get_transformation(&self) -> Result<String> {
        let mut res = ptr::null();
        let mut res_len = 0;

        try_dpi!(
            externs::dpiDeqOptions_getTransformation(self.inner, &mut res, &mut res_len),
            {
                let transformation = if res.is_null() {
                    "".to_string()
                } else {
                    let res_s = ODPIStr::new(res, res_len);
                    res_s.into()
                };
                Ok(transformation)
            },
            ErrorKind::DeqOptions("dpiDeqOptions_getTransformation".to_string())
        )
    }

    /// Returns whether the message being dequeued is part of the current transaction or constitutes
    /// a transaction on its own.
    pub fn get_visibility(&self) -> Result<enums::ODPIVisibility> {
        let mut visibility = enums::ODPIVisibility::OnCommit;

        try_dpi!(
            externs::dpiDeqOptions_getVisibility(self.inner, &mut visibility),
            Ok(visibility),
            ErrorKind::DeqOptions("dpiDeqOptions_getVisibility".to_string())
        )
    }

    /// Returns the time to wait, in seconds, for a message matching the search criteria. See
    /// function `dequeue::Options::set_wait()` for more information.
    pub fn get_wait(&self) -> Result<u32> {
        let mut wait = 0;

        try_dpi!(
            externs::dpiDeqOptions_getWait(self.inner, &mut wait),
            Ok(wait),
            ErrorKind::DeqOptions("dpiDeqOptions_getWait".to_string())
        )
    }

    /// Releases a reference to the dequeue options. A count of the references to the dequeue
    /// options is maintained and when this count reaches zero, the memory associated with the
    /// options is freed.
    pub fn release(&self) -> Result<()> {
        try_dpi!(
            externs::dpiDeqOptions_release(self.inner),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_release".to_string())
        )
    }

    /// Sets the condition which must be true for messages to be dequeued. The condition must be a
    /// valid boolean expression similar to the where clause of a SQL query. The expression can
    /// include conditions on message properties, user data properties and PL/SQL or SQL functions.
    /// User data properties must be prefixed with tab.user_data as a qualifier to indicate the
    /// specific column of the queue table that stores the message payload.
    ///
    /// * `condition` - a string in the encoding used for CHAR data, or None if the condition is to
    /// be cleared.
    pub fn set_condition(&self, condition: Option<&str>) -> Result<()> {
        let cond_s = ODPIStr::from(condition);

        try_dpi!(
            externs::dpiDeqOptions_setCondition(self.inner, cond_s.ptr(), cond_s.len()),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setCondition".to_string())
        )
    }

    /// Sets the name of the consumer which will be dequeuing messages. This value should only be
    /// set if the queue is set up for multiple consumers.
    ///
    /// * `consumer_name` - a string in the encoding used for CHAR data, or None if the consumer
    /// name is to be cleared.
    pub fn set_consumer_name(&self, cosumer_name: Option<&str>) -> Result<()> {
        let cons_s = ODPIStr::from(cosumer_name);

        try_dpi!(
            externs::dpiDeqOptions_setConsumerName(self.inner, cons_s.ptr(), cons_s.len()),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setConsumerName".to_string())
        )
    }

    /// Sets the correlation of the message to be dequeued. Special pattern matching characters such
    /// as the percent sign (%) and the underscore (_) can be used. If multiple messages satisfy the
    /// pattern, the order of dequeuing is undetermined.
    ///
    /// * `correlation` - a string in the encoding used for CHAR data, or None if the correlation is
    /// to be cleared.
    pub fn set_correlation(&self, correlation: Option<&str>) -> Result<()> {
        let corr_s = ODPIStr::from(correlation);

        try_dpi!(
            externs::dpiDeqOptions_setCorrelation(self.inner, corr_s.ptr(), corr_s.len()),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setCorrelation".to_string())
        )
    }

    /// Sets the mode that is to be used when dequeuing messages.
    ///
    /// * `mode` - he mode that should be used. It should be one of the values from the enumeration
    /// `ODPIDeqMode`.
    pub fn set_mode(&self, mode: enums::ODPIDeqMode) -> Result<()> {
        try_dpi!(
            externs::dpiDeqOptions_setMode(self.inner, mode),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setMode".to_string())
        )
    }

    /// Sets the identifier of the specific message to be dequeued.
    ///
    /// * `msg_id` - a string making up the message identifier, or None if no specific message is to
    /// be dequeued.
    pub fn set_msg_id(&self, msg_id: Option<&str>) -> Result<()> {
        let msg_id_s = ODPIStr::from(msg_id);

        try_dpi!(
            externs::dpiDeqOptions_setMsgId(self.inner, msg_id_s.ptr(), msg_id_s.len()),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setMsgId".to_string())
        )
    }

    /// Sets the position in the queue of the message that is to be dequeued.
    ///
    /// * `nav` - the value that should be used. It should be one of the values from the enumeration
    /// `ODPIDeqNavigation`.
    pub fn set_navigation(&self, nav: enums::ODPIDeqNavigation) -> Result<()> {
        try_dpi!(
            externs::dpiDeqOptions_setNavigation(self.inner, nav),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setNavigation".to_string())
        )
    }

    /// Sets the transformation of the message to be dequeued. The transformation is applied after
    /// the message is dequeued but before it is returned to the application. It must be created
    /// using DBMS_TRANSFORM.
    ///
    /// * `transform` - a string in the encoding used for CHAR data, or None if the transformation
    /// is to be cleared.
    pub fn set_transformation(&self, transform: Option<&str>) -> Result<()> {
        let transform_s = ODPIStr::from(transform);

        try_dpi!(
            externs::dpiDeqOptions_setTransformation(
                self.inner,
                transform_s.ptr(),
                transform_s.len()
            ),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setTransformation".to_string())
        )
    }

    /// Sets whether the message being dequeued is part of the current transaction or constitutes a
    /// transaction on its own.
    ///
    /// * `visibility` - the value that should be used. It should be one of the values from the
    /// enumeration `ODPIVisibility`.
    pub fn set_visibility(&self, visibility: enums::ODPIVisibility) -> Result<()> {
        try_dpi!(
            externs::dpiDeqOptions_setVisibility(self.inner, visibility),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setVisibility".to_string())
        )
    }

    /// Set the time to wait, in seconds, for a message matching the search criteria.
    ///
    /// * `wait` - the number of seconds to wait for a message matching the search criteria. Any
    /// integer is valid but the predefined constants DPI_DEQ_WAIT_NO_WAIT and DPI_DEQ_WAIT_FOREVER
    /// are provided as a convenience.
    pub fn set_wait(&self, wait: u32) -> Result<()> {
        try_dpi!(
            externs::dpiDeqOptions_setWait(self.inner, wait),
            Ok(()),
            ErrorKind::DeqOptions("dpiDeqOptions_setWait".to_string())
        )
    }
}

impl From<*mut ODPIDeqOptions> for Options {
    fn from(inner: *mut ODPIDeqOptions) -> Options {
        Options { inner: inner }
    }
}