dhis2/d2

import MockApi from '../../api/Api'
import SystemSettings from '../SystemSettings'

jest.mock('../../api/Api')

const settingsFixture = {
    keyLastSuccessfulResourceTablesUpdate: 'Tue Mar 10 12:24:00 CET 2015',
}

describe('settings.System', () => {
    let systemSettings
    let mockApi

    beforeEach(() => {
        MockApi.mockReset()
        mockApi = MockApi.getApi()
        systemSettings = new SystemSettings(new MockApi())
    })

    it('should not be allowed to be called without new', () => {
        expect(() => SystemSettings()).toThrowErrorMatchingSnapshot()
    })

    it('should set an instance of Api onto the SystemSettings instance', () => {
        expect(systemSettings.api).toBe(mockApi)
    })

    describe('all', () => {
        beforeEach(() => {
            systemSettings.api.get.mockReturnValueOnce(
                Promise.resolve(settingsFixture)
            )
        })

        it('should be a function', () => {
            expect(systemSettings.all).toBeInstanceOf(Function)
        })

        it('should call the api to get all the systemSettings', () =>
            systemSettings.all().then(() => {
                expect(mockApi.get).toHaveBeenCalledTimes(1)
                expect(mockApi.get.mock.calls[0][0]).toEqual('systemSettings')
            }))

        it('should resolve the promise with the settings', () =>
            systemSettings.all().then((settings) => {
                expect(settings.keyLastSuccessfulResourceTablesUpdate).toBe(
                    'Tue Mar 10 12:24:00 CET 2015'
                )
            }))

        it('should only call the API once', () =>
            systemSettings
                .all()
                .then(() => systemSettings.all())
                .then(() => {
                    expect(systemSettings.settings).toEqual(settingsFixture)
                    expect(mockApi.get).toHaveBeenCalledTimes(1)
                }))
    })

    describe('get', () => {
        beforeEach(() => {
            systemSettings = new SystemSettings(MockApi.getApi())
        })

        it('should be a function', () => {
            expect(systemSettings.get).toBeInstanceOf(Function)
        })

        it('should return a Promise', () => {
            systemSettings.api.get.mockReturnValueOnce(
                Promise.resolve(
                    settingsFixture.keyLastSuccessfulResourceTablesUpdate
                )
            )

            const result = systemSettings.get(
                'keyLastSuccessfulResourceTablesUpdate'
            )

            expect(result).toBeInstanceOf(Promise)
        })

        it('should reject the promise with an error if no key has been specified', () => {
            expect.assertions(2)

            return systemSettings.get().catch((error) => {
                expect(error).toBeInstanceOf(TypeError)
                expect(error.message).toBe(
                    'A "key" parameter should be specified when calling get() on systemSettings'
                )
            })
        })

        it('should call the api to get the value', () => {
            systemSettings.api.get.mockReturnValueOnce(
                Promise.resolve(
                    settingsFixture.keyLastSuccessfulResourceTablesUpdate
                )
            )

            systemSettings.get('keyLastSuccessfulResourceTablesUpdate')

            expect(systemSettings.api.get.mock.calls[0][0]).toBe(
                'systemSettings/keyLastSuccessfulResourceTablesUpdate'
            )
        })

        it('should return the value from the promise', () => {
            systemSettings.api.get.mockReturnValueOnce(
                Promise.resolve(
                    settingsFixture.keyLastSuccessfulResourceTablesUpdate
                )
            )

            return systemSettings
                .get('keyLastSuccessfulResourceTablesUpdate')
                .then((value) => {
                    expect(value).toBe('Tue Mar 10 12:24:00 CET 2015')
                })
        })

        it('should try to transform the response to json if possible', () => {
            systemSettings.api.get.mockReturnValueOnce(
                Promise.resolve('{"mydataKey": "myDataValue"}')
            )

            return systemSettings
                .get('keyLastSuccessfulResourceTablesUpdate')
                .then((value) => {
                    expect(value).toEqual({ mydataKey: 'myDataValue' })
                })
        })

        it('should reject the promise if the value is empty', () => {
            systemSettings.api.get.mockReturnValueOnce(Promise.resolve())

            return systemSettings.get('keyThatDefinitelyDoesNotExist').then(
                () => Promise.reject('Promise resolved'),
                (error) => {
                    expect(error.message).toBe(
                        'The requested systemSetting has no value or does not exist.'
                    )
                }
            )
        })

        it("should call the API for every operation when there's no cache", () => {
            systemSettings.api.get
                .mockReturnValueOnce(
                    Promise.resolve(
                        settingsFixture.keyLastSuccessfulResourceTablesUpdate
                    )
                )
                .mockReturnValueOnce(
                    Promise.resolve(
                        settingsFixture.keyLastSuccessfulResourceTablesUpdate
                    )
                )

            return systemSettings
                .get('keyLastSuccessfulResourceTablesUpdate')
                .then(() =>
                    systemSettings.get('keyLastSuccessfulResourceTablesUpdate')
                )
                .then(() => {
                    expect(systemSettings.api.get).toHaveBeenCalledTimes(2)
                })
        })

        it('should only call the API once when there is a cache', () => {
            systemSettings.api.get.mockReturnValueOnce(
                Promise.resolve(settingsFixture)
            )

            return systemSettings
                .all()
                .then(() =>
                    systemSettings.get('keyLastSuccessfulResourceTablesUpdate')
                )
                .then(() =>
                    systemSettings.get('keyLastSuccessfulResourceTablesUpdate')
                )
                .then((value) => {
                    expect(value).toBe(
                        settingsFixture.keyLastSuccessfulResourceTablesUpdate
                    )
                    expect(systemSettings.api.get).toHaveBeenCalledTimes(1)
                })
        })

        it('should also return a promise when serving cached values', () => {
            systemSettings.api.get.mockReturnValueOnce(
                Promise.resolve(settingsFixture)
            )

            return systemSettings.all().then(() => {
                expect(
                    systemSettings.get('keyLastSuccessfulResourceTablesUpdate')
                ).toBeInstanceOf(Promise)
            })
        })
    })

    describe('.set', () => {
        beforeEach(() => {
            systemSettings = new SystemSettings(new MockApi())

            mockApi.get.mockReturnValue(Promise.resolve(settingsFixture))
            mockApi.post.mockReturnValue(Promise.resolve())
            mockApi.delete.mockReturnValue(Promise.resolve())
        })

        it('should POST to the API', () =>
            systemSettings.set('mySetting', 'my value').then(() => {
                expect(mockApi.get).toHaveBeenCalledTimes(0)
                expect(mockApi.post).toHaveBeenCalledTimes(1)
                expect(mockApi.delete).toHaveBeenCalledTimes(0)
            }))

        it('should DELETE if the value is null or an empty string', () =>
            systemSettings.set('mySetting', '').then(() => {
                expect(mockApi.get).toHaveBeenCalledTimes(0)
                expect(mockApi.post).toHaveBeenCalledTimes(0)
                expect(mockApi.delete).toHaveBeenCalledTimes(1)
            }))

        it('should not alter the value', () => {
            const value = { type: 'object', value: 'some value' }

            return systemSettings.set('mySetting', value).then(() => {
                expect(mockApi.get).toHaveBeenCalledTimes(0)
                expect(mockApi.post).toHaveBeenCalledTimes(1)
                expect(mockApi.delete).toHaveBeenCalledTimes(0)

                expect(mockApi.post.mock.calls[0][0]).toBe(
                    'systemSettings/mySetting'
                )
                expect(mockApi.post.mock.calls[0][1]).toBe(value)
            })
        })

        it('should add a "Content-Type: text/plain" header to the request', () => {
            const value = 'test'

            return systemSettings.set('mySetting', value).then(() => {
                expect(mockApi.get).toHaveBeenCalledTimes(0)
                expect(mockApi.post).toHaveBeenCalledTimes(1)
                expect(mockApi.delete).toHaveBeenCalledTimes(0)

                const requestOptions = {
                    headers: { 'Content-Type': 'text/plain' },
                }
                expect(mockApi.post).toBeCalledWith(
                    'systemSettings/mySetting',
                    value,
                    requestOptions
                )
            })
        })

        it('should update the settings cache', () =>
            systemSettings
                .all()
                .then(() => systemSettings.set('test', 'value'))
                .then(() => systemSettings.all())
                .then(() => systemSettings.get('test'))
                .then((test) => {
                    expect(mockApi.get).toHaveBeenCalledTimes(1)
                    expect(mockApi.post).toHaveBeenCalledTimes(1)
                    expect(test).toEqual('value')
                }))
    })

    describe('.set API request', () => {
        beforeEach(() => {
            systemSettings.api.post.mockReturnValueOnce(Promise.resolve())
        })

        afterEach(() => {
            systemSettings = new SystemSettings(new MockApi())
        })

        it('should not encode the value as JSON', () => {
            const value = 'test'

            return systemSettings.set('mySetting', value).then(() => {
                expect(mockApi.post).toHaveBeenCalledTimes(1)
                expect(mockApi.post.mock.calls[0][0]).toBe(
                    'systemSettings/mySetting'
                )
                expect(mockApi.post.mock.calls[0][1]).toBe(value)
            })
        })
    })
})