package com.minelittlepony.client.model;

import com.minelittlepony.client.model.armour.ModelPonyArmour;
import com.minelittlepony.client.model.part.PonySnout;
import com.minelittlepony.client.model.armour.ArmourWrapper;
import com.minelittlepony.client.transform.PonyTransformation;
import com.minelittlepony.model.BodyPart;
import com.minelittlepony.model.IPart;
import com.minelittlepony.model.armour.IEquestrianArmour;
import com.minelittlepony.mson.api.model.MsonPart;

import net.minecraft.client.model.ModelPart;
import net.minecraft.client.render.VertexConsumer;
import net.minecraft.client.util.math.MatrixStack;
import net.minecraft.client.util.math.Vector3f;
import net.minecraft.entity.Entity;
import net.minecraft.entity.LivingEntity;
import net.minecraft.util.Arm;
import net.minecraft.util.math.MathHelper;

/**
 * Foundation class for all types of ponies.
 */
public abstract class AbstractPonyModel<T extends LivingEntity> extends ClientPonyModel<T> {

    protected ModelPart upperTorso;
    protected ModelPart upperTorsoOverlay;

    protected ModelPart neck;

    protected IPart tail;
    protected PonySnout snout;
    protected IPart ears;

    public AbstractPonyModel(boolean arms) {
        super(0, arms);
    }

    @Override
    public IEquestrianArmour<?> createArmour() {
        return new ArmourWrapper<>(ModelPonyArmour::new);
    }

    /**
     * Sets the model's various rotation angles.
     *
     * @param move      Entity motion parameter
     *                  i.e. velocity in no specific direction used in bipeds to calculate step amount.
     * @param swing     Degree to which each 'limb' swings.
     * @param ticks     Total whole and partial ticks since the entity's existence.
     *                  Used in animations together with {@code swing} and {@code move}.
     * @param headYaw   Horizontal head motion in radians.
     * @param headPitch Vertical head motion in radians.
     * @param scale     Scaling factor used to render this model.
     *                  Determined by the return value of {@link RenderLivingBase.prepareScale}.
     *                  Usually {@code 0.0625F}.
     * @param entity    The entity we're being called for.
     */
    @Override
    public void setAngles(T entity, float move, float swing, float ticks, float headYaw, float headPitch) {
        attributes.checkRainboom(entity, swing, canFly());

        super.setAngles(entity, move, swing, ticks, headYaw, headPitch);

        updateHeadRotation(headYaw, headPitch);
        shakeBody(move, swing, getWobbleAmount(), ticks);
        rotateLegs(move, swing, ticks, entity);

        if (!attributes.isSwimming && !attributes.isGoingFast) {
            holdItem(swing);
        }
        swingItem(entity);

        if (attributes.isCrouching) {
            ponyCrouch();
        } else if (isRiding) {
            ponyRide();
        } else {
            adjustBody(BODY_ROT_X_NOTSNEAK, BODY_RP_Y_NOTSNEAK, BODY_RP_Z_NOTSNEAK);

            rightLeg.pivotY = FRONT_LEG_RP_Y_NOTSNEAK;
            leftLeg.pivotY = FRONT_LEG_RP_Y_NOTSNEAK;

            if (!attributes.isSleeping) {
                animateBreathing(ticks);
            }

            if (attributes.isSwimmingRotated) {
                head.setPivot(0, -2, -2);
            } else {
                head.setPivot(0, 0, 0);
            }
        }

        if (attributes.isSleeping) {
            ponySleep();
        }

        animateWears();

        snout.setGender(getMetadata().getGender());
    }

    /**
     * Aligns legs to a sneaky position.
     */
    protected void ponyCrouch() {
        adjustBody(BODY_ROT_X_SNEAK, BODY_RP_Y_SNEAK, BODY_RP_Z_SNEAK);
        head.setPivot(0, 6, -2);

        rightArm.pitch -= LEG_ROT_X_SNEAK_ADJ;
        leftArm.pitch -= LEG_ROT_X_SNEAK_ADJ;

        leftLeg.pivotY = FRONT_LEG_RP_Y_SNEAK;
        rightLeg.pivotY = FRONT_LEG_RP_Y_SNEAK;
    }

    protected void ponySleep() {
        rightArm.pitch = ROTATE_270;
        leftArm.pitch = ROTATE_270;

        rightLeg.pitch = ROTATE_90;
        leftLeg.pitch = ROTATE_90;

        head.setPivot(1, 2, isSneaking ? -1 : 1);

        ((MsonPart)rightArm).shift(0, 2,  6);
        ((MsonPart)leftArm).shift(0, 2,  6);
        ((MsonPart)rightLeg).shift(0, 2, -8);
        ((MsonPart)leftLeg).shift(0, 2, -8);
    }

    protected void ponyRide() {
        if (attributes.isSitting) {
            adjustBodyComponents(BODY_ROT_X_RIDING * 2, BODY_RP_Y_RIDING, BODY_RP_Z_RIDING);
            adjustNeck(BODY_ROT_X_NOTSNEAK * 2, BODY_RP_Y_NOTSNEAK, BODY_RP_Z_NOTSNEAK - 4);
            head.setPivot(0, -2, -5);
        } else {
            adjustBodyComponents(BODY_ROT_X_RIDING, BODY_RP_Y_RIDING, BODY_RP_Z_RIDING);
            adjustNeck(BODY_ROT_X_NOTSNEAK, BODY_RP_Y_NOTSNEAK, BODY_RP_Z_NOTSNEAK);
            head.setPivot(0, 0, 0);
        }

        leftLeg.pivotZ = 15;
        leftLeg.pivotY = 9;
        leftLeg.pitch = -PI / 4;
        leftLeg.yaw = -PI / 5;

        rightLeg.pivotZ = 15;
        rightLeg.pivotY = 9;
        rightLeg.pitch = -PI / 4;
        rightLeg.yaw =  PI / 5;

        leftArm.roll = -PI * 0.06f;
        rightArm.roll = PI * 0.06f;

        if (attributes.isSitting) {
            leftLeg.yaw = PI / 15;
            leftLeg.pitch = PI / 9;

            leftLeg.pivotZ = 10;
            leftLeg.pivotY = 7;

            rightLeg.yaw = -PI / 15;
            rightLeg.pitch = PI / 9;

            rightLeg.pivotZ = 10;
            rightLeg.pivotY = 7;

            leftArm.pitch = PI / 6;
            rightArm.pitch = PI / 6;

            leftArm.roll *= 2;
            rightArm.roll *= 2;
        }
    }

    /**
     * Sets the model's various rotation angles.
     *
     * @param move      Entity motion parameter - i.e. velocity in no specific direction used in bipeds to calculate step amount.
     * @param swing     Degree to which each 'limb' swings.
     * @param bodySwing Horizontal (Y) body rotation.
     * @param ticks       Total whole and partial ticks since the entity's existance. Used in animations together with {@code swing} and {@code move}.
     */
    protected void shakeBody(float move, float swing, float bodySwing, float ticks) {
        tail.setRotationAndAngles(attributes.isSwimming || attributes.isGoingFast, attributes.interpolatorId, move, swing, bodySwing * 5, ticks);

        upperTorso.yaw = bodySwing;
        torso.yaw = bodySwing;
        neck.yaw = bodySwing;
    }

    private void animateWears() {
        leftSleeve.copyPositionAndRotation(leftArm);
        rightSleeve.copyPositionAndRotation(rightArm);
        leftPantLeg.copyPositionAndRotation(leftLeg);
        rightPantLeg.copyPositionAndRotation(rightLeg);
        jacket.copyPositionAndRotation(torso);
        helmet.copyPositionAndRotation(head);
        upperTorsoOverlay.copyPositionAndRotation(upperTorso);
    }

    /**
     * Called to update the head rotation.
     *
     * @param x     New rotation X
     * @param y     New rotation Y
     */
    private void updateHeadRotation(float headYaw, float headPitch) {
        headYaw = attributes.isSleeping ? (Math.abs(attributes.interpolatorId.getMostSignificantBits()) % 2.8F) - 1.9F : headYaw / 57.29578F;
        headPitch = attributes.isSleeping ? 0.1f : headPitch / 57.29578F;

        if (attributes.isSwimming && attributes.motionPitch != 0) {
            headPitch -= 0.9F;
        }

        head.yaw = 0;
        head.roll = 0;

        if (attributes.isSwimmingRotated) {
            head.roll = -headYaw;
        } else {
            head.yaw = headYaw;
        }

        float pitch = (float)Math.toRadians(attributes.motionPitch);

        head.pitch = MathHelper.clamp(headPitch, -1.25f - pitch, 0.5f - pitch);
    }

    /**
    *
    * Used to set the legs rotation based on walking/crouching animations.
    *
    * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
    *
    */
    protected void rotateLegs(float move, float swing, float ticks, T entity) {
        if (attributes.isSwimming) {
            rotateLegsSwimming(move, swing, ticks, entity);
        } else if (attributes.isGoingFast) {
            rotateLegsInFlight(move, swing, ticks, entity);
        } else {
            rotateLegsOnGround(move, swing, ticks, entity);
        }

        float sin = MathHelper.sin(torso.yaw) * 5;
        float cos = MathHelper.cos(torso.yaw) * 5;

        float spread = attributes.isGoingFast ? 2 : 1;

        rightArm.pivotZ = spread + sin;
        leftArm.pivotZ = spread - sin;

        float legRPX = cos - getLegOutset() - 0.001F;

        legRPX = getMetadata().getInterpolator(attributes.interpolatorId).interpolate("legOffset", legRPX, 3);

        rightArm.pivotX = -legRPX;
        rightLeg.pivotX = -legRPX;

        leftArm.pivotX = legRPX;
        leftLeg.pivotX = legRPX;

        rightArm.yaw += torso.yaw;
        leftArm.yaw += torso.yaw;

        rightArm.pivotY = leftArm.pivotY = 8;
        rightLeg.pivotZ = leftLeg.pivotZ = 10;
    }

    /**
     * Rotates legs in a quopy fashion whilst swimming.
     *
     * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
     */
    protected void rotateLegsSwimming(float move, float swing, float ticks, T entity) {

        float lerp = entity.isSwimming() ? (float)attributes.motionLerp : 1;

        float legLeft = (ROTATE_90 + MathHelper.sin((move / 3) + 2 * PI/3) / 2) * lerp;

        float left = (ROTATE_90 + MathHelper.sin((move / 3) + 2 * PI) / 2) * lerp;
        float right = (ROTATE_90 + MathHelper.sin(move / 3) / 2) * lerp;

        leftArm.pitch = -left;
        leftArm.yaw = -left/2;
        leftArm.roll = left/2;

        rightArm.pitch = -right;
        rightArm.yaw = right/2;
        rightArm.roll = -right/2;

        leftLeg.pitch = legLeft;
        rightLeg.pitch = right;

        leftLeg.yaw = 0;
        rightLeg.yaw = 0;
    }

    /**
     * Rotates legs in quopy fashion whilst flying.
     *
     * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
     *
     */
    protected void rotateLegsInFlight(float move, float swing, float ticks, Entity entity) {
        float armX = attributes.isGoingFast ? ROTATE_270 : MathHelper.sin(-swing / 2);
        float legX = attributes.isGoingFast ? ROTATE_90 : MathHelper.sin(swing / 2);

        leftArm.pitch = armX;
        rightArm.pitch = armX;

        leftLeg.pitch = legX;
        rightLeg.pitch = legX;

        leftArm.yaw = -0.2F;
        leftLeg.yaw = 0.2F;

        rightArm.yaw = 0.2F;
        rightLeg.yaw = -0.2F;

        rightArm.roll = 0;
        leftArm.roll = 0;
    }

    /**
     * Rotates legs in quopy fashion for walking.
     *
     * Takes the same parameters as {@link AbstractPonyModel.setRotationAndAngles}
     *
     */
    protected void rotateLegsOnGround(float move, float swing, float ticks, T entity) {
        float angle = PI * (float) Math.pow(swing, 16);

        float baseRotation = move * 0.6662F; // magic number ahoy
        float scale = swing / 4;

        leftArm.pitch =  MathHelper.cos(baseRotation + angle) * scale;
        rightArm.pitch = MathHelper.cos(baseRotation + PI + angle / 2) * scale;

        leftLeg.pitch =  MathHelper.cos(baseRotation + PI - (angle * 0.4f)) * scale;
        rightLeg.pitch = MathHelper.cos(baseRotation + angle / 5) * scale;

        leftArm.yaw = 0;
        rightArm.yaw = 0;

        leftLeg.yaw = 0;
        rightLeg.yaw = 0;

        rightArm.roll = 0;
        leftArm.roll = 0;
    }

    protected float getLegOutset() {
        if (attributes.isSleeping) {
            return 3.6f;
        }

        if (attributes.isCrouching) {
            return 1;
        }

        return 5;
    }

    /**
     * Adjusts legs as if holding an item. Delegates to the correct arm/leg/limb as necessary.
     */
    protected void holdItem(float swing) {
        boolean both = leftArmPose == ArmPose.ITEM && rightArmPose == ArmPose.ITEM;

        alignArmForAction(getArm(Arm.LEFT), leftArmPose, rightArmPose, both, swing, 1);
        alignArmForAction(getArm(Arm.RIGHT), rightArmPose, leftArmPose, both, swing, -1);
    }

    @Override
    public ModelPart getBodyPart(BodyPart part) {
        switch (part) {
            default:
            case HEAD: return head;
            case NECK: return neck;
            case TAIL:
            case LEGS:
            case BODY: return torso;
        }
    }

    /**
     * Aligns an arm for the appropriate arm pose
     *
     * @param arm   The arm model to align
     * @param pose  The post to align to
     * @param both  True if we have something in both hands
     * @param swing     Degree to which each 'limb' swings.
     */
    protected void alignArmForAction(ModelPart arm, ArmPose pose, ArmPose complement, boolean both, float swing, float reflect) {
        switch (pose) {
            case ITEM:
                arm.yaw = 0;

                if ((!both || reflect == (attributes.isLeftHanded ? 1 : -1)) && complement != ArmPose.BLOCK) {
                    float swag = 1;
                    if (!isFlying() && both) {
                        swag -= (float)Math.pow(swing, 2);
                    }

                    float mult = 1 - swag/2;
                    arm.pitch = arm.pitch * mult - (PI / 10) * swag;
                    arm.roll = -reflect * (PI / 15);

                    if (attributes.isCrouching) {
                        arm.pivotX -= reflect * 2;
                    }
                }

                break;
            case EMPTY:
                arm.yaw = 0;
                break;
            case BLOCK:
                arm.pitch = (arm.pitch / 2 - 0.9424779F) - 0.3F;
                arm.yaw = reflect * PI / 9;
                if (complement == pose) {
                    arm.yaw -= reflect * PI / 18;
                }
                arm.pivotX += reflect;
                arm.pivotZ += 3;
                if (attributes.isCrouching) {
                    arm.pivotY += 4;
                }
                break;
            case BOW_AND_ARROW:
                aimBow(arm, swing);
                break;
            case CROSSBOW_HOLD:
                aimBow(arm, swing);

                arm.pitch = head.pitch - ROTATE_90;
                arm.yaw = head.yaw + 0.06F;
                break;
            case CROSSBOW_CHARGE:
                aimBow(arm, swing);

                arm.pitch = -0.8F;
                arm.yaw = head.yaw + 0.06F;
                break;
            case THROW_SPEAR:
                arm.pitch = ROTATE_90 * 2;
                break;
        }
    }

    protected void aimBow(ModelPart arm, float ticks) {
        arm.pitch = ROTATE_270 + head.pitch + (MathHelper.sin(ticks * 0.067F) * 0.05F);
        arm.yaw = head.yaw - 0.06F;
        arm.roll = MathHelper.cos(ticks * 0.09F) * 0.05F + 0.05F;

        if (isSneaking) {
            arm.pivotY += 4;
        }
    }

    /**
     * Animates arm swinging. Delegates to the correct arm/leg/limb as neccessary.
     *
     * @param entity     The entity we are being called for.
     */
    protected void swingItem(T entity) {
        if (getSwingAmount() > 0 && !attributes.isSleeping) {
            Arm mainSide = getPreferredArm(entity);

            swingArm(getArm(mainSide));
        }
    }

    /**
     * Animates arm swinging.
     *
     * @param arm       The arm to swing
     */
    protected void swingArm(ModelPart arm) {
        float swing = 1 - (float)Math.pow(1 - getSwingAmount(), 3);

        float deltaX = MathHelper.sin(swing * PI);
        float deltaZ = MathHelper.sin(getSwingAmount() * PI);

        float deltaAim = deltaZ * (0.7F - head.pitch) * 0.75F;

        arm.pitch -= deltaAim + deltaX * 1.2F;
        arm.yaw += torso.yaw * 2;
        arm.roll = -deltaZ * 0.4F;
    }

    /**
     * Animates the arm's breathing animation when holding items.
     *
     * @param ticks       Total whole and partial ticks since the entity's existence.
     *                    Used in animations together with {@code swing} and {@code move}.
     */
    protected void animateBreathing(float ticks) {
        float cos = MathHelper.cos(ticks * 0.09F) * 0.05F + 0.05F;
        float sin = MathHelper.sin(ticks * 0.067F) * 0.05F;

        boolean animateLeft =
                (leftArmPose != ArmPose.EMPTY && (leftArmPose != rightArmPose || attributes.isLeftHanded))
                && rightArmPose != ArmPose.BLOCK;
        boolean animateRight =
                (rightArmPose != ArmPose.EMPTY && (leftArmPose != rightArmPose || !attributes.isLeftHanded))
                && leftArmPose != ArmPose.BLOCK;

        if (animateRight) {
            rightArm.roll += cos;
            rightArm.pitch += sin;
        }

        if (animateLeft) {
            leftArm.roll += cos;
            leftArm.pitch += sin;
        }
    }

    protected void adjustBody(float rotateAngleX, float rotationPointY, float rotationPointZ) {
        adjustBodyComponents(rotateAngleX, rotationPointY, rotationPointZ);
        adjustNeck(rotateAngleX, rotationPointY, rotationPointZ);
    }

    protected void adjustBodyComponents(float rotateAngleX, float rotationPointY, float rotationPointZ) {
        torso.pitch = rotateAngleX;
        torso.pivotY = rotationPointY;
        torso.pivotZ = rotationPointZ;

        upperTorso.pitch = rotateAngleX;
        upperTorso.pivotY = rotationPointY;
        upperTorso.pivotZ = rotationPointZ;
    }

    private void adjustNeck(float rotateAngleX, float rotationPointY, float rotationPointZ) {
        neck.setPivot(NECK_ROT_X + rotateAngleX, rotationPointY, rotationPointZ);
    }

    @Override
    public float getRiderYOffset() {

        if (isChild()) {
            return 0.25F;
        }

        switch (getSize()) {
            case NORMAL: return 0.4F;
            case FOAL:
            case TALL:
            case BULKY:
            default: return 0.25F;
        }
    }

    @Override
    public void render(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        renderStage(BodyPart.BODY, stack, vertices, overlayUv, lightUv, red, green, blue, alpha, this::renderBody);
        renderStage(BodyPart.NECK, stack, vertices, overlayUv, lightUv, red, green, blue, alpha, this::renderNeck);
        renderStage(BodyPart.HEAD, stack, vertices, overlayUv, lightUv, red, green, blue, alpha, this::renderHead);
        renderStage(BodyPart.LEGS, stack, vertices, overlayUv, lightUv, red, green, blue, alpha, this::renderLegs);

        if (textureHeight == 64) {
            renderStage(BodyPart.LEGS, stack, vertices, overlayUv, lightUv, red, green, blue, alpha, this::renderSleeves);
            renderStage(BodyPart.BODY, stack, vertices, overlayUv, lightUv, red, green, blue, alpha, this::renderVest);
        }

        renderStage(BodyPart.HEAD, stack, vertices, overlayUv, lightUv, red, green, blue, alpha, this::renderHelmet);
    }

    protected void renderStage(BodyPart part, MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha, RenderStage action) {
        stack.push();
        transform(part, stack);
        action.accept(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        stack.pop();
    }

    protected void renderHead(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        head.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
    }

    protected void renderHelmet(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        helmet.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
    }

    protected void renderNeck(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        stack.scale(0.9F, 0.9F, 0.9F);
        neck.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
    }

    protected void renderBody(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        torso.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        upperTorso.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        torso.rotate(stack);
        tail.renderPart(stack, vertices, overlayUv, lightUv, red, green, blue, alpha, attributes.interpolatorId);
    }

    protected void renderVest(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        jacket.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        upperTorsoOverlay.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
    }

    protected void renderLegs(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        if (!isSneaking) {
            torso.rotate(stack);
        }

        leftArm.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        rightArm.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        leftLeg.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        rightLeg.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
    }

    protected void renderSleeves(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha) {
        leftSleeve.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        rightSleeve.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        leftPantLeg.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
        rightPantLeg.render(stack, vertices, overlayUv, lightUv, red, green, blue, alpha);
    }

    @Override
    public void setVisible(boolean visible) {
        super.setVisible(visible);

        upperTorso.visible = visible;
        upperTorsoOverlay.visible = visible;

        neck.visible = visible;

        tail.setVisible(visible);
    }

    @Override
    public void transform(BodyPart part, MatrixStack stack) {
        if (attributes.isSleeping) {
            stack.multiply(Vector3f.POSITIVE_X.getDegreesQuaternion(90));
            stack.multiply(Vector3f.POSITIVE_Y.getDegreesQuaternion(180));
        }

        if (part == BodyPart.HEAD) {
           stack.multiply(Vector3f.POSITIVE_X.getDegreesQuaternion(attributes.motionPitch));
        }

        PonyTransformation.forSize(getSize()).transform(this, part);
    }

    interface RenderStage {
        void accept(MatrixStack stack, VertexConsumer vertices, int overlayUv, int lightUv, float red, float green, float blue, float alpha);
    }
}