/* eslint-disable import/namespace */
import * as spec from '.';

describe('style-spec', () => {
    ['v8', 'latest'].forEach((version) => {
        ['', 'min'].forEach((kind) => {
            const v = version + kind;
            test(v, () => {
                for (const k in spec[v]) {
                    // Exception for version.
                    if (k === '$version') {
                        expect(typeof spec[v].$version).toBe('number');
                    } else {
                        validSchema(k, v, spec[v][k], spec[v], version, kind);
                    }
                }
            });
        });
    });

    test('v8 Spec SDK Support section', () => {
        const v = 'v8';
        const propObjs = [].concat(spec[v].paint).concat(spec[v].layout);
        propObjs.forEach((objKey) => {
            const props = spec[v][objKey];
            const propKeys = Object.keys(props);
            propKeys.forEach((key) => {
                expect(props[key]['sdk-support']).toBeTruthy();
                if (props[key]['sdk-support']) {
                    expect(props[key]['sdk-support']['basic functionality']).toBeTruthy();
                    if (props[key]['property-type'].includes('constant')) {
                        expect(props[key]['sdk-support']['data-driven styling']).toBeFalsy();
                    } else {
                        expect(props[key]['sdk-support']['data-driven styling']).toBeTruthy();
                    }
                }
            });
        });

        const expressions = spec[v].expression_name.values;
        const expressionNames = Object.keys(expressions);
        expressionNames.forEach((expr) => {
            expect(expressions[expr]['sdk-support']).toBeTruthy();
            if (expressions[expr]['sdk-support']) {
                expect(expressions[expr]['sdk-support']['basic functionality']).toBeTruthy();
            }
        });
    });
});

function validSchema(k, v, obj, ref, version, kind) {
    const scalar = ['boolean', 'string', 'number'];
    const types = Object.keys(ref).concat(['boolean', 'string', 'number',
        'array', 'enum', 'color', '*',
        // new in v8
        'opacity', 'translate-array', 'dash-array', 'offset-array', 'font-array', 'field-template',
        // new enums in v8
        'line-cap-enum',
        'line-join-enum',
        'symbol-placement-enum',
        'rotation-alignment-enum',
        'text-justify-enum',
        'text-anchor-enum',
        'text-transform-enum',
        'visibility-enum',
        'property-type',
        'formatted',
        'resolvedImage',
        'promoteId',
        'padding',
        'variableAnchorOffsetCollection',
        'sprite'
    ]);
    const keys = [
        'default',
        'doc',
        'example',
        'function',
        'zoom-function',
        'property-function',
        'function-output',
        'expression',
        'property-type',
        'length',
        'min-length',
        'required',
        'transition',
        'type',
        'value',
        'units',
        'tokens',
        'values',
        'maximum',
        'minimum',
        'period',
        'requires',
        'sdk-support',
        'overridable'
    ];

    // Schema object.
    if (Array.isArray(obj.type) || typeof obj.type === 'string') {
        // schema must have only known keys
        for (const attr in obj) {
            expect(keys.indexOf(attr) !== -1).toBeTruthy();
        }

        // schema type must be js native, 'color', or present in ref root object.
        expect(types.indexOf(obj.type) !== -1).toBeTruthy();

        // schema type is an enum, it must have 'values' and they must be
        // objects (>=v8) or scalars (<=v7). If objects, check that doc key
        // (if present) is a string.
        if (obj.type === 'enum') {
            const values = (ref.$version >= 8 ? Object.keys(obj.values) : obj.values);
            expect(Array.isArray(values) && values.every((v) => {
                return scalar.indexOf(typeof v) !== -1;
            })).toBeTruthy();
            if (ref.$version >= 8) {
                for (const v in obj.values) {
                    if (Array.isArray(obj.values) === false) { // skips $root.version
                        if (obj.values[v].doc !== undefined) {
                            expect('string').toBe(typeof obj.values[v].doc);
                            expect(kind).not.toBe('min');
                        } else {
                            expect(v).not.toBe('latest');
                        }
                    }
                }
            }
        }

        // schema type is array, it must have 'value' and it must be a type.
        if (obj.value !== undefined) {
            if (Array.isArray(obj.value)) {
                obj.value.forEach((i) => {
                    expect(types.indexOf(i) !== -1).toBeTruthy();
                });
            } else if (typeof obj.value === 'object') {
                validSchema(`${k}.value`, v, obj.value, ref, undefined, undefined);
            } else {
                expect(types.indexOf(obj.value) !== -1).toBeTruthy();
            }
        }

        // schema key doc checks
        if (obj.doc !== undefined) {
            expect('string').toBe(typeof obj.doc);
            expect(kind).not.toBe('min');
        } else {
            expect(v).not.toBe('latest');
        }

        // schema key example checks
        if (kind === 'min') {
            expect(obj.example).toBeDefined();
        }

        // schema key function checks
        if (obj.function !== undefined) {
            expect(ref.$version < 8).toBeTruthy();
            if (ref.$version >= 7) {
                expect(true).toBe(['interpolated', 'piecewise-constant'].indexOf(obj.function) >= 0);
            } else {
                expect('boolean').toBe(typeof obj.function);
            }
        } else if (obj.expression !== undefined) {
            const expression = obj.expression;
            expect(ref['property-type'][obj['property-type']]).toBeTruthy();
            expect('boolean').toBe(typeof expression.interpolated);
            expect(true).toBe(Array.isArray(expression.parameters));
            if (obj['property-type'] !== 'color-ramp') expect(true).toBe(
                expression.parameters.every(k => k === 'zoom' || k === 'feature' || k === 'feature-state')
            );
        }

        // schema key required checks
        if (obj.required !== undefined) {
            expect('boolean').toBe(typeof obj.required);
        }

        // schema key transition checks
        if (obj.transition !== undefined) {
            expect('boolean').toBe(typeof obj.transition);
        }

        // schema key requires checks
        if (obj.requires !== undefined) {
            expect(true).toBe(Array.isArray(obj.requires));
        }
    } else if (Array.isArray(obj)) {
        obj.forEach((child, j) => {
            if (typeof child === 'string' && scalar.indexOf(child) !== -1) return;
            validSchema(`${k}[${j}]`, v, typeof child === 'string' ? ref[child] : child, ref, undefined, undefined);
        });
        // Container object.
    } else if (typeof obj === 'object') {
        for (const j in obj) validSchema(`${k}.${j}`, v, obj[j], ref, undefined, undefined);
        // Invalid ref object.
    } else {
        expect(false).toBeTruthy();
    }
}