import { spy } from 'sinon';

import { ArrayCollection } from '../array-collection';
import { SanitizationError, ValidationError } from '../errors';
import { Model } from '../model';
import { ObjectSchema, populateObject, proxifyObject,
         setObject, toObject, validateObject,
       } from './object';
import { ReferenceSchema } from './reference';
import { ISchemaParent, ISchemaParentInstance, SchemaInstanceMap, SchemaMap } from './schema';
import { StringSchema } from './string';

class ReferencedModel extends Model {
  public id: string;
}
ReferencedModel.setSchema('id', new StringSchema());

const collection = new ArrayCollection<ReferencedModel>(ReferencedModel, {modelIdField: 'id'});
const referencedInstance = new  ReferencedModel({id: '0xACAB'});
collection.insert(referencedInstance);

interface IOuter {
  foo?: string | ReferencedModel;
  bar?: string;
}

const outerSchemaMap: SchemaMap<IOuter> = {
  foo: new ReferenceSchema({collection: () => collection}),
  bar: new StringSchema(),
};

describe('helpers', () => {
  interface IFooBar {
    foo?: string;
    bar?: string;
  }

  const schemaMap: SchemaMap<IFooBar> = {
    foo: new StringSchema({required: true, default: 'default'}),
    bar: new StringSchema(),
  };

  let parentInstance: ISchemaParentInstance;

  beforeEach(() => {
    parentInstance = {
      value: {},
      schema: new StringSchema(),
      beforeChange: spy(),
      afterChange: spy(),
    };
  });

  describe('populateObject()', () => {
    it('should throw if a key is not in schema.', async () => {
      await expect(populateObject({}, {}, outerSchemaMap, {baz: true} as any))
        .to.be.rejectedWith(Error, 'Key baz not found in schema.');
    });

    it('should throw if a key is not in schema.', async () => {
      await expect(populateObject({bar: 'foo'}, {bar: outerSchemaMap.bar.create('foo')}, outerSchemaMap, {bar: true}))
        .to.be.rejectedWith(Error, 'Key bar is not populatable.');
    });

    it('should ignore a key if it is undefined', async () => {
      const obj: IOuter = {bar: 'foo'};
      const result = await populateObject(obj, {bar: outerSchemaMap.bar.create('foo')}, outerSchemaMap, {foo: true});
      expect(result).to.equal(obj).and.to.eql({bar: 'foo'});
    });

    it('should populate a key', async () => {
      const obj = {foo: '0xACAB', bar: 'test'};
      const instanceMap = {
        foo: outerSchemaMap.foo.create('0xACAB'),
        bar: outerSchemaMap.bar.create('test'),
      };
      const result = await populateObject(obj, instanceMap, outerSchemaMap, {foo: true});
      expect(result).to.equal(obj).and.to.eql({foo: {id: '0xACAB'}, bar: 'test'});
      expect(result.foo).to.be.an.instanceOf(ReferencedModel);
    });
  });

  describe('proxifyObject()', () => {
    it('should get a value for a key', () => {
      const obj = {foo: 'bar'};
      const fooInstance = schemaMap.foo.create('bar');
      const instanceMap: SchemaInstanceMap<IFooBar> = {foo: fooInstance};
      const proxy = proxifyObject<IFooBar>(obj, instanceMap, parentInstance, schemaMap);
      expect(proxy.foo).to.equal('bar');
    });

    it('should assign a value to a key', () => {
      const obj = {};
      const instanceMap: SchemaInstanceMap<IFooBar> = {};
      const proxy = proxifyObject<IFooBar>(obj, instanceMap, parentInstance, schemaMap);
      proxy.foo = 'bar';
      expect(obj).to.eql({foo: 'bar'});
      expect(instanceMap).to.eql({
        foo: {value: 'bar', parent: {instance: parentInstance, path: 'foo'}, schema: schemaMap.foo},
      });
      expect(parentInstance.beforeChange).to.be.calledOnce.and
        .calledWith([], {foo: 'bar'}, parentInstance);
      expect(parentInstance.afterChange).to.be.calledOnce.and
        .calledWith([], {foo: 'bar'}, parentInstance);
    });

    it('should delete a key', () => {
      const obj = {foo: 'bar'};
      const fooInstance = schemaMap.foo.create('bar');
      const instanceMap: SchemaInstanceMap<IFooBar> = {foo: fooInstance};
      const proxy = proxifyObject<IFooBar>(obj, instanceMap, parentInstance, schemaMap);
      delete proxy.foo;
      expect(obj).to.eql({});
      expect(instanceMap).to.eql({});
      expect(parentInstance.beforeChange).to.be.calledOnce.and
        .calledWith([], {foo: undefined}, parentInstance);
      expect(parentInstance.afterChange).to.be.calledOnce.and
        .calledWith([], {foo: undefined}, parentInstance);
      expect(fooInstance).to.not.have.property('parent');
    });
  });

  describe('setObject', () => {
    it('should throw if key not in schema', () => {
      expect(() => setObject({baz: 'foo'}, {}, {}, parentInstance, schemaMap, {}))
        .to.throw(SanitizationError, 'Key baz not found in schema.');
    });

    it('should throw if a nested schema sanitization throws', () => {
      expect(() => setObject({bar: 42}, {}, {}, parentInstance, schemaMap, {}))
        .to.throw(SanitizationError, 'Value is not a string.');
    });

    it('should do nothing with an empty data object', () => {
      const obj = {};
      const octoValueMap: SchemaInstanceMap = {};
      setObject({}, obj, octoValueMap, parentInstance, schemaMap, {});
      expect(obj).to.eql({});
      expect(octoValueMap).to.eql({});
    });

    it('should set a valid property', () => {
      const obj = {};
      const instanceMap: SchemaInstanceMap<IFooBar> = {};
      setObject({foo: 'bar'}, obj, instanceMap, parentInstance, schemaMap, {});
      expect(obj).to.eql({foo: 'bar'});
      expect(instanceMap).to.eql({
        foo: {value: 'bar', schema: schemaMap.foo, parent: {instance: parentInstance, path: 'foo'}},
      });
    });

    it('should not modify an existing property', () => {
      const obj = {bar: 'baz'};
      const barInstance = {value: 'baz', schema: schemaMap.bar, parent: {instance: parentInstance, path: 'bar'}};
      const instanceMap: SchemaInstanceMap<IFooBar> = {bar: barInstance};
      setObject<IFooBar>({foo: 'bar'}, obj, instanceMap, parentInstance, schemaMap, {});
      expect(obj).to.eql({foo: 'bar', bar: 'baz'});
      expect(instanceMap.bar).to.equal(barInstance);
      expect(instanceMap).to.eql({
        bar: barInstance,
        foo: {value: 'bar', schema: schemaMap.foo, parent: {instance: parentInstance, path: 'foo'}},
      });
    });

    it('should set a default value', () => {
      const obj = {};
      const instanceMap: SchemaInstanceMap<IFooBar> = {};
      setObject({bar: 'bar'}, obj, instanceMap, parentInstance, schemaMap, {defaults: true});
      expect(obj).to.eql({foo: 'default', bar: 'bar'});
      expect(instanceMap).to.eql({
        bar: {value: 'bar', schema: schemaMap.bar, parent: {instance: parentInstance, path: 'bar'}},
        foo: {value: 'default', schema: schemaMap.foo, parent: {instance: parentInstance, path: 'foo'}},
      });
    });

    it('should replace an object', () => {
      const obj = {bar: 'baz'};
      const barInstance = {value: 'baz', schema: schemaMap.bar, parent: {instance: parentInstance, path: 'bar'}};
      const instanceMap: SchemaInstanceMap<IFooBar> = {bar: barInstance};
      setObject<IFooBar>({foo: 'bar'}, obj, instanceMap, parentInstance, schemaMap, {replace: true});
      expect(obj).to.eql({foo: 'bar'});
      expect(instanceMap).to.eql({
        foo: {value: 'bar', schema: schemaMap.foo, parent: {instance: parentInstance, path: 'foo'}},
      });
    });
  });

  describe('toObject()', () => {
    it('should return an object', () => {
      const instanceMap: SchemaInstanceMap<IFooBar> = {
        foo: {value: 'bar', schema: schemaMap.foo, parent: {instance: parentInstance, path: 'foo'}},
      };
      expect(toObject(instanceMap)).to.eql({foo: 'bar'});
    });
  });

  describe('validateObject()', () => {
    const instance: ISchemaParentInstance = {
      value: {},
      schema: new StringSchema(),
      beforeChange: spy(),
      afterChange: spy(),
    };

    it('should throw if required key is undefined in the instanceMap', async () => {
      const instanceMap: SchemaInstanceMap<IFooBar> = {};
      await expect(validateObject(instanceMap, instance, schemaMap))
        .to.be.rejectedWith(ValidationError, 'Key foo is required.');
    });

    it('should pass for a valid object', async () => {
      const instanceMap: SchemaInstanceMap = {
        foo: schemaMap.foo.create('bar', {parent: {instance: parentInstance, path: 'foo'}}),
      };
      await validateObject(instanceMap, instance, schemaMap);
    });
  });
});

describe('ObjectSchema', () => {
  let parentInstance: ISchemaParentInstance;
  let parent: ISchemaParent = {instance: parentInstance, path: 'path'};

  beforeEach(() => {
    parentInstance = {
      value: {},
      schema: new StringSchema(),
      beforeChange: spy(),
      afterChange: spy(),
    };
    parent = {instance: parentInstance, path: 'path'};
  });

  describe('constructor()', () => {
    it('should be instantiatable with options', () => {
      const schema = new ObjectSchema({schemaMap: {foo: new StringSchema()}});
      expect(schema).to.have.property('options').that.eql({schemaMap: {foo: {options: {}}}});
    });
  });

  describe('create()', () => {
    // note: the constructor wraps setObject() (see above)
    it('should throw a SanitizationError if value is not an object', () => {
      const schema = new ObjectSchema({schemaMap: {}});
      expect(() => schema.create(42))
        .to.throw(SanitizationError, 'Value is not an object.');
    });

    it('should return an undefined for undefined input', () => {
      const schema = new ObjectSchema({schemaMap: {}});
      expect(schema.create(undefined)).to.equal(undefined);
    });

    it('should return an empty object for undefined if required and defaults', () => {
      const schema = new ObjectSchema({schemaMap: {}, required: true});
      expect(schema.create(undefined, {defaults: true, parent}))
        .to.have.property('value').that.eql({});
    });

    it('should return an instance with an object for undefined if required and defaults', () => {
      const schema = new ObjectSchema({
        required: true,
        schemaMap: {foo: new StringSchema({default: 'bar'})},
      });
      expect(schema.create(undefined, {defaults: true}))
        .to.have.property('value').that.eql({foo: 'bar'});
    });

    it('should return an instance with an object', () => {
      const schema = new ObjectSchema({schemaMap: {foo: new StringSchema()}});
      expect(schema.create({foo: 'bar'}))
        .to.have.property('value').that.eql({foo: 'bar'});
    });

    describe('proxy', () => {
      interface IProxyInner {
        bar?: string;
      }

      interface IProxyOuter {
        foo?: string;
        nested?: IProxyInner;
      }

      const schema = new ObjectSchema<IProxyOuter>({
        schemaMap: {
          foo: new StringSchema(),
          nested: new ObjectSchema<IProxyInner>({
            schemaMap: {bar: new StringSchema()},
          }),
        },
      });

      it('should intercept assigning a value to a key', () => {
        const instance = schema.create({}, {parent});
        const obj = instance.value;

        obj.foo = 'bar';
        expect(instance.value).to.eql({foo: 'bar'});
        expect(parentInstance.beforeChange).to.be.calledOnce.and
          .calledWith(['path'], {foo: 'bar'}, instance);
        expect(parentInstance.afterChange).to.be.calledOnce.and
          .calledWith(['path'], {foo: 'bar'}, instance);
      });

      it('should intercept deleting a key', () => {
        const instance = schema.create({foo: 'bar'}, {parent});
        const obj = instance.value;

        delete obj.foo;
        expect(instance.value).to.eql({});
        expect(parentInstance.beforeChange).to.be.calledOnce.and
          .calledWith(['path'], {foo: undefined}, instance);
        expect(parentInstance.afterChange).to.be.calledOnce.and
          .calledWith(['path'], {foo: undefined}, instance);
      });

      it('should intercept assigning a value to a nested key', () => {
        const instance = schema.create({nested: {}}, {parent});
        const obj = instance.value;

        obj.nested.bar = 'baz';
        expect(instance.value).to.eql({nested: {bar: 'baz'}});
        expect(parentInstance.beforeChange).to.be.calledOnce.and
          .calledWith(['path', 'nested'], {bar: 'baz'}, instance.instanceMap.nested);
        expect(parentInstance.afterChange).to.be.calledOnce.and
          .calledWith(['path', 'nested'], {bar: 'baz'}, instance.instanceMap.nested);
      });

      it('should intercept assigning a value to a nested key', () => {
        const instance = schema.create({nested: {bar: 'baz'}}, {parent});
        const obj = instance.value;

        delete obj.nested.bar;
        expect(instance.value).to.eql({nested: {}});
        expect(parentInstance.beforeChange).to.be.calledOnce.and
          .calledWith(['path', 'nested'], {bar: undefined}, instance.instanceMap.nested);
        expect(parentInstance.afterChange).to.be.calledOnce.and
          .calledWith(['path', 'nested'], {bar: undefined}, instance.instanceMap.nested);
      });
    });
  });

  describe('populate()', () => {
    // note: OctoObject.populate() wraps populateObject() (see above)

    it('should throw if populateReference is not an object', async () => {
      const schema = new ObjectSchema<IOuter>({schemaMap: outerSchemaMap});
      await expect(schema.populate(schema.create({}), true))
        .to.be.rejectedWith('populateReference must be an object');
    });

    it('should populate a reference', async () => {
      const schema = new ObjectSchema<IOuter>({schemaMap: outerSchemaMap});
      const instance = schema.create({foo: '0xACAB', bar: 'test'});
      const result = await schema.populate(instance, {foo: true});
      expect(result).to.equal(instance.value);
      expect(result).to.eql({foo: {id: '0xACAB'}, bar: 'test'});
      expect(result.foo).to.be.an.instanceOf(ReferencedModel);
    });
  });

  describe('toObject()', () => {
    // note: OctoObject.toObject() wraps toObject() (see above)
    it('should return an object', () => {
      const schema = new ObjectSchema({schemaMap: {foo: new StringSchema()}});
      const instance = schema.create({foo: 'bar'});
      expect(schema.toObject(instance)).to.eql({foo: 'bar'}).and.not.equal(instance.value);
    });
  });

  describe('validate()', () => {
    it('should throw a ValidationError if nested value is required but undefined', async () => {
      const schema = new ObjectSchema({schemaMap: {foo: new StringSchema({required: true})}});
      await expect(schema.validate(schema.create({})))
        .to.be.rejectedWith(ValidationError, 'Key foo is required.');
    });

    it('should throw a ValidationError if nested validation fails', async () => {
      const schema = new ObjectSchema({schemaMap: {foo: new StringSchema({enum: ['bar']})}});
      await expect(schema.validate(schema.create({foo: 'baz'})))
        .to.be.rejectedWith(ValidationError, 'String not in enum: bar.');
    });

    it('should run custom validator', async () => {
      const schema = new ObjectSchema<{foo: string}>({
        schemaMap: {foo: new StringSchema()},
        validate: async instance => {
          if (instance.value.foo === 'bar') {
            throw new ValidationError('bar is not allowed.');
          }
        },
      });
      await schema.validate(schema.create({foo: 'baz'}));
      await expect(schema.validate(schema.create({foo: 'bar'})))
        .to.be.rejectedWith(ValidationError, 'bar is not allowed.');
    });

    it('should validate an object', async () => {
      const schema = new ObjectSchema({schemaMap: {foo: new StringSchema()}});
      await schema.validate(schema.create({foo: 'bar'}));
    });
  });
});