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/** @file  FBXAnimation.cpp
 *  @brief Assimp::FBX::AnimationCurve, Assimp::FBX::AnimationCurveNode,
 *         Assimp::FBX::AnimationLayer, Assimp::FBX::AnimationStack
 */

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include "FBXDocument.h"
#include "FBXDocumentUtil.h"
#include "FBXImporter.h"
#include "FBXParser.h"

namespace Assimp {
namespace FBX {

using namespace Util;

// ------------------------------------------------------------------------------------------------
AnimationCurve::AnimationCurve(uint64_t id, const Element &element, const std::string &name, const Document & /*doc*/) :
        Object(id, element, name) {
    const Scope &sc = GetRequiredScope(element);
    const Element &KeyTime = GetRequiredElement(sc, "KeyTime");
    const Element &KeyValueFloat = GetRequiredElement(sc, "KeyValueFloat");

    ParseVectorDataArray(keys, KeyTime);
    ParseVectorDataArray(values, KeyValueFloat);

    if (keys.size() != values.size()) {
        DOMError("the number of key times does not match the number of keyframe values", &KeyTime);
    }

    // check if the key times are well-ordered
    if (!std::equal(keys.begin(), keys.end() - 1, keys.begin() + 1, std::less<KeyTimeList::value_type>())) {
        DOMError("the keyframes are not in ascending order", &KeyTime);
    }

    const Element *KeyAttrDataFloat = sc["KeyAttrDataFloat"];
    if (KeyAttrDataFloat) {
        ParseVectorDataArray(attributes, *KeyAttrDataFloat);
    }

    const Element *KeyAttrFlags = sc["KeyAttrFlags"];
    if (KeyAttrFlags) {
        ParseVectorDataArray(flags, *KeyAttrFlags);
    }
}

// ------------------------------------------------------------------------------------------------
AnimationCurveNode::AnimationCurveNode(uint64_t id, const Element &element, const std::string &name,
        const Document &doc, const char *const *target_prop_whitelist /*= nullptr*/,
        size_t whitelist_size /*= 0*/) :
        Object(id, element, name), target(), doc(doc) {
    const Scope &sc = GetRequiredScope(element);

    // find target node
    const char *whitelist[] = { "Model", "NodeAttribute", "Deformer" };
    const std::vector<const Connection *> &conns = doc.GetConnectionsBySourceSequenced(ID(), whitelist, 3);

    for (const Connection *con : conns) {

        // link should go for a property
        if (!con->PropertyName().length()) {
            continue;
        }

        if (target_prop_whitelist) {
            const char *const s = con->PropertyName().c_str();
            bool ok = false;
            for (size_t i = 0; i < whitelist_size; ++i) {
                if (!strcmp(s, target_prop_whitelist[i])) {
                    ok = true;
                    break;
                }
            }

            if (!ok) {
                throw std::range_error("AnimationCurveNode target property is not in whitelist");
            }
        }

        const Object *const ob = con->DestinationObject();
        if (!ob) {
            DOMWarning("failed to read destination object for AnimationCurveNode->Model link, ignoring", &element);
            continue;
        }

        target = ob;
        if (!target) {
            continue;
        }

        prop = con->PropertyName();
        break;
    }

    if (!target) {
        DOMWarning("failed to resolve target Model/NodeAttribute/Constraint for AnimationCurveNode", &element);
    }

    props = GetPropertyTable(doc, "AnimationCurveNode.FbxAnimCurveNode", element, sc, false);
}

// ------------------------------------------------------------------------------------------------
const AnimationCurveMap &AnimationCurveNode::Curves() const {
    if (!curves.empty()) {
        return curves;
    }

    // resolve attached animation curves
    const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID(), "AnimationCurve");

    for (const Connection *con : conns) {

        // link should go for a property
        if (!con->PropertyName().length()) {
            continue;
        }

        const Object *const ob = con->SourceObject();
        if (nullptr == ob) {
            DOMWarning("failed to read source object for AnimationCurve->AnimationCurveNode link, ignoring", &element);
            continue;
        }

        const AnimationCurve *const anim = dynamic_cast<const AnimationCurve *>(ob);
        if (nullptr == anim) {
            DOMWarning("source object for ->AnimationCurveNode link is not an AnimationCurve", &element);
            continue;
        }

        curves[con->PropertyName()] = anim;
    }

    return curves;
}

// ------------------------------------------------------------------------------------------------
AnimationLayer::AnimationLayer(uint64_t id, const Element &element, const std::string &name, const Document &doc) :
        Object(id, element, name), doc(doc) {
    const Scope &sc = GetRequiredScope(element);

    // note: the props table here bears little importance and is usually absent
    props = GetPropertyTable(doc, "AnimationLayer.FbxAnimLayer", element, sc, true);
}

// ------------------------------------------------------------------------------------------------
AnimationCurveNodeList AnimationLayer::Nodes(const char *const *target_prop_whitelist /*= nullptr*/,
        size_t whitelist_size /*= 0*/) const {
    AnimationCurveNodeList nodes;

    // resolve attached animation nodes
    const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID(), "AnimationCurveNode");
    nodes.reserve(conns.size());

    for (const Connection *con : conns) {

        // link should not go to a property
        if (con->PropertyName().length()) {
            continue;
        }

        const Object *const ob = con->SourceObject();
        if (!ob) {
            DOMWarning("failed to read source object for AnimationCurveNode->AnimationLayer link, ignoring", &element);
            continue;
        }

        const AnimationCurveNode *const anim = dynamic_cast<const AnimationCurveNode *>(ob);
        if (!anim) {
            DOMWarning("source object for ->AnimationLayer link is not an AnimationCurveNode", &element);
            continue;
        }

        if (target_prop_whitelist) {
            const char *s = anim->TargetProperty().c_str();
            bool ok = false;
            for (size_t i = 0; i < whitelist_size; ++i) {
                if (!strcmp(s, target_prop_whitelist[i])) {
                    ok = true;
                    break;
                }
            }
            if (!ok) {
                continue;
            }
        }
        nodes.push_back(anim);
    }

    return nodes; // pray for NRVO
}

// ------------------------------------------------------------------------------------------------
AnimationStack::AnimationStack(uint64_t id, const Element &element, const std::string &name, const Document &doc) :
        Object(id, element, name) {
    const Scope &sc = GetRequiredScope(element);

    // note: we don't currently use any of these properties so we shouldn't bother if it is missing
    props = GetPropertyTable(doc, "AnimationStack.FbxAnimStack", element, sc, true);

    // resolve attached animation layers
    const std::vector<const Connection *> &conns = doc.GetConnectionsByDestinationSequenced(ID(), "AnimationLayer");
    layers.reserve(conns.size());

    for (const Connection *con : conns) {

        // link should not go to a property
        if (con->PropertyName().length()) {
            continue;
        }

        const Object *const ob = con->SourceObject();
        if (!ob) {
            DOMWarning("failed to read source object for AnimationLayer->AnimationStack link, ignoring", &element);
            continue;
        }

        const AnimationLayer *const anim = dynamic_cast<const AnimationLayer *>(ob);
        if (!anim) {
            DOMWarning("source object for ->AnimationStack link is not an AnimationLayer", &element);
            continue;
        }
        layers.push_back(anim);
    }
}

} // namespace FBX
} // namespace Assimp

#endif // ASSIMP_BUILD_NO_FBX_IMPORTER
