using Codice.CM.Common;
using Unity.PlasticSCM.Editor.Tool;

namespace Unity.PlasticSCM.Editor.Views.Changesets
{
    static class LaunchDiffOperations
    {
        internal static void DiffChangeset(
            RepositorySpec repSpec,
            long changesetId,
            bool isGluonMode)
        {
            if (changesetId == -1)
                return;

            string changesetFullSpec = GetChangesetFullSpec(
                repSpec, changesetId);

            LaunchTool.OpenChangesetDiffs(
                changesetFullSpec,
                isGluonMode);
        }

        internal static void DiffChangeset(
            RepositorySpec repSpec,
            ChangesetInfo changesetInfo,
            bool isGluonMode)
        {
            if (changesetInfo == null)
                return;

            string changesetFullSpec = GetChangesetFullSpec(
                repSpec, changesetInfo.ChangesetId);

            LaunchTool.OpenChangesetDiffs(
                changesetFullSpec,
                isGluonMode);
        }

        internal static void DiffSelectedChangesets(
            RepositorySpec repSpec,
            ChangesetInfo cset1,
            ChangesetInfo cset2,
            bool isGluonMode)
        {
            ChangesetInfo srcChangesetInfo;
            ChangesetInfo dstChangesetInfo;

            GetSrcAndDstCangesets(
                cset1,
                cset2,
                out srcChangesetInfo,
                out dstChangesetInfo);

            string srcChangesetFullSpec = GetChangesetFullSpec(
                repSpec, srcChangesetInfo.ChangesetId);

            string dstChangesetFullSpec = GetChangesetFullSpec(
                repSpec, dstChangesetInfo.ChangesetId);

            LaunchTool.OpenSelectedChangesetsDiffs(
                srcChangesetFullSpec,
                dstChangesetFullSpec,
                isGluonMode);
        }

        internal static void DiffBranch(
            RepositorySpec repSpec,
            ChangesetExtendedInfo changesetExtendedInfo,
            bool isGluonMode)
        {
            if (changesetExtendedInfo == null)
                return;

            string branchFullSpec = GetBranchFullSpec(
                repSpec, changesetExtendedInfo);

            LaunchTool.OpenBranchDiffs(
                branchFullSpec,
                isGluonMode);
        }

        static void GetSrcAndDstCangesets(
            ChangesetInfo cset1,
            ChangesetInfo cset2,
            out ChangesetInfo srcChangesetInfo,
            out ChangesetInfo dstChangesetInfo)
        {
            if (cset1.LocalTimeStamp < cset2.LocalTimeStamp)
            {
                srcChangesetInfo = cset1;
                dstChangesetInfo = cset2;
                return;
            }

            srcChangesetInfo = cset2;
            dstChangesetInfo = cset1;
        }

        static string GetChangesetFullSpec(
            RepositorySpec repSpec,
            long changesetId)
        {
            return string.Format("cs:{0}@{1}",
                changesetId, repSpec.ToString());
        }

        static string GetBranchFullSpec(
            RepositorySpec repSpec,
            ChangesetExtendedInfo changesetExtendedInfo)
        {
            return string.Format("br:{0}@{1}",
                changesetExtendedInfo.BranchName,
                repSpec.ToString());
        }
    }
}
