const Declaration = require('../declaration');

class TransformDecl extends Declaration {

    static names = ['transform', 'transform-origin'];

    static functions3d = [
        'matrix3d', 'translate3d', 'translateZ', 'scale3d', 'scaleZ',
        'rotate3d', 'rotateX', 'rotateY', 'perspective'
    ];

    /**
     * Recursively check all parents for @keyframes
     */
    keyframeParents(decl) {
        let { parent } = decl;
        while (parent) {
            if (parent.type === 'atrule' && parent.name === 'keyframes') {
                return true;
            }
            ({ parent } = parent);
        }
        return false;
    }

    /**
     * Is transform contain 3D commands
     */
    contain3d(decl) {
        if (decl.prop === 'transform-origin') {
            return false;
        }

        for (let func of TransformDecl.functions3d) {
            if (decl.value.indexOf(`${func}(`) !== -1) {
                return true;
            }
        }

        return false;
    }

    /**
     * Replace rotateZ to rotate for IE 9
     */
    set(decl, prefix) {
        decl = super.set(decl, prefix);
        if (prefix === '-ms-') {
            decl.value = decl.value.replace(/rotateZ/gi, 'rotate');
        }
        return decl;
    }

    /**
     * Don't add prefix for IE in keyframes
     */
    insert(decl, prefix, prefixes) {
        if (prefix === '-ms-') {
            if (!this.contain3d(decl) && !this.keyframeParents(decl)) {
                return super.insert(decl, prefix, prefixes);
            }
        } else if (prefix === '-o-') {
            if (!this.contain3d(decl)) {
                return super.insert(decl, prefix, prefixes);
            }
        } else {
            return super.insert(decl, prefix, prefixes);
        }
        return undefined;
    }

}

module.exports = TransformDecl;
