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use std::mem;

use crate::build::CheckoutBuilder;
use crate::merge::MergeOptions;
use crate::raw;
use std::ptr;

/// Options to specify when reverting
pub struct RevertOptions<'cb> {
    mainline: u32,
    checkout_builder: Option<CheckoutBuilder<'cb>>,
    merge_opts: Option<MergeOptions>,
}

impl<'cb> RevertOptions<'cb> {
    /// Creates a default set of revert options
    pub fn new() -> RevertOptions<'cb> {
        RevertOptions {
            mainline: 0,
            checkout_builder: None,
            merge_opts: None,
        }
    }

    /// Set the mainline value
    ///
    /// For merge commits, the "mainline" is treated as the parent.
    pub fn mainline(&mut self, mainline: u32) -> &mut Self {
        self.mainline = mainline;
        self
    }

    /// Set the checkout builder
    pub fn checkout_builder(&mut self, cb: CheckoutBuilder<'cb>) -> &mut Self {
        self.checkout_builder = Some(cb);
        self
    }

    /// Set the merge options
    pub fn merge_opts(&mut self, merge_opts: MergeOptions) -> &mut Self {
        self.merge_opts = Some(merge_opts);
        self
    }

    /// Obtain the raw struct
    pub fn raw(&mut self) -> raw::git_revert_options {
        unsafe {
            let mut checkout_opts: raw::git_checkout_options = mem::zeroed();
            raw::git_checkout_init_options(&mut checkout_opts, raw::GIT_CHECKOUT_OPTIONS_VERSION);
            if let Some(ref mut cb) = self.checkout_builder {
                cb.configure(&mut checkout_opts);
            }

            let mut merge_opts: raw::git_merge_options = mem::zeroed();
            raw::git_merge_init_options(&mut merge_opts, raw::GIT_MERGE_OPTIONS_VERSION);
            if let Some(ref opts) = self.merge_opts {
                ptr::copy(opts.raw(), &mut merge_opts, 1);
            }

            let mut revert_opts: raw::git_revert_options = mem::zeroed();
            raw::git_revert_options_init(&mut revert_opts, raw::GIT_REVERT_OPTIONS_VERSION);
            revert_opts.mainline = self.mainline;
            revert_opts.checkout_opts = checkout_opts;
            revert_opts.merge_opts = merge_opts;

            revert_opts
        }
    }
}