const path = require('path')
const fs = require('fs-plus')
const temp = require('temp').track()

describe('atom.themes', function () {
  beforeEach(function () {
    spyOn(atom, 'inSpecMode').andReturn(false)
    spyOn(console, 'warn')
  })

  afterEach(function () {
    waitsForPromise(() => atom.themes.deactivateThemes())
    runs(function () {
      try {
        temp.cleanupSync()
      } catch (error) {}
    })
  })

  describe('theme getters and setters', function () {
    beforeEach(function () {
      jasmine.snapshotDeprecations()
      atom.packages.loadPackages()
    })

    afterEach(() => jasmine.restoreDeprecationsSnapshot())

    describe('getLoadedThemes', () =>
      it('gets all the loaded themes', function () {
        const themes = atom.themes.getLoadedThemes()
        expect(themes.length).toBeGreaterThan(2)
      })
    )

    describe('getActiveThemes', () =>
      it('gets all the active themes', function () {
        waitsForPromise(() => atom.themes.activateThemes())

        runs(function () {
          const names = atom.config.get('core.themes')
          expect(names.length).toBeGreaterThan(0)
          const themes = atom.themes.getActiveThemes()
          expect(themes).toHaveLength(names.length)
        })
      })
    )
  })

  describe('when the core.themes config value contains invalid entry', () =>
    it('ignores theme', function () {
      atom.config.set('core.themes', [
        'atom-light-ui',
        null,
        undefined,
        '',
        false,
        4,
        {},
        [],
        'atom-dark-ui'
      ])

      expect(atom.themes.getEnabledThemeNames()).toEqual(['atom-dark-ui', 'atom-light-ui'])
    })
)

  describe('::getImportPaths()', function () {
    it('returns the theme directories before the themes are loaded', function () {
      atom.config.set('core.themes', ['theme-with-index-less', 'atom-dark-ui', 'atom-light-ui'])

      const paths = atom.themes.getImportPaths()

      // syntax theme is not a dir at this time, so only two.
      expect(paths.length).toBe(2)
      expect(paths[0]).toContain('atom-light-ui')
      expect(paths[1]).toContain('atom-dark-ui')
    })

    it('ignores themes that cannot be resolved to a directory', function () {
      atom.config.set('core.themes', ['definitely-not-a-theme'])
      expect(() => atom.themes.getImportPaths()).not.toThrow()
    })
  })

  describe('when the core.themes config value changes', function () {
    it('add/removes stylesheets to reflect the new config value', function () {
      let didChangeActiveThemesHandler
      atom.themes.onDidChangeActiveThemes(didChangeActiveThemesHandler = jasmine.createSpy())
      spyOn(atom.styles, 'getUserStyleSheetPath').andCallFake(() => null)

      waitsForPromise(() => atom.themes.activateThemes())

      runs(function () {
        didChangeActiveThemesHandler.reset()
        atom.config.set('core.themes', [])
      })

      waitsFor('a', () => didChangeActiveThemesHandler.callCount === 1)

      runs(function () {
        didChangeActiveThemesHandler.reset()
        expect(document.querySelectorAll('style.theme')).toHaveLength(0)
        atom.config.set('core.themes', ['atom-dark-ui'])
      })

      waitsFor('b', () => didChangeActiveThemesHandler.callCount === 1)

      runs(function () {
        didChangeActiveThemesHandler.reset()
        expect(document.querySelectorAll('style[priority="1"]')).toHaveLength(2)
        expect(document.querySelector('style[priority="1"]').getAttribute('source-path')).toMatch(/atom-dark-ui/)
        atom.config.set('core.themes', ['atom-light-ui', 'atom-dark-ui'])
      })

      waitsFor('c', () => didChangeActiveThemesHandler.callCount === 1)

      runs(function () {
        didChangeActiveThemesHandler.reset()
        expect(document.querySelectorAll('style[priority="1"]')).toHaveLength(2)
        expect(document.querySelectorAll('style[priority="1"]')[0].getAttribute('source-path')).toMatch(/atom-dark-ui/)
        expect(document.querySelectorAll('style[priority="1"]')[1].getAttribute('source-path')).toMatch(/atom-light-ui/)
        atom.config.set('core.themes', [])
      })

      waitsFor(() => didChangeActiveThemesHandler.callCount === 1)

      runs(function () {
        didChangeActiveThemesHandler.reset()
        expect(document.querySelectorAll('style[priority="1"]')).toHaveLength(2)
        // atom-dark-ui has a directory path, the syntax one doesn't
        atom.config.set('core.themes', ['theme-with-index-less', 'atom-dark-ui'])
      })

      waitsFor(() => didChangeActiveThemesHandler.callCount === 1)

      runs(function () {
        expect(document.querySelectorAll('style[priority="1"]')).toHaveLength(2)
        const importPaths = atom.themes.getImportPaths()
        expect(importPaths.length).toBe(1)
        expect(importPaths[0]).toContain('atom-dark-ui')
      })
    })

    it('adds theme-* classes to the workspace for each active theme', function () {
      atom.config.set('core.themes', ['atom-dark-ui', 'atom-dark-syntax'])

      let didChangeActiveThemesHandler
      atom.themes.onDidChangeActiveThemes(didChangeActiveThemesHandler = jasmine.createSpy())
      waitsForPromise(() => atom.themes.activateThemes())

      const workspaceElement = atom.workspace.getElement()
      runs(function () {
        expect(workspaceElement).toHaveClass('theme-atom-dark-ui')

        atom.themes.onDidChangeActiveThemes(didChangeActiveThemesHandler = jasmine.createSpy())
        atom.config.set('core.themes', ['theme-with-ui-variables', 'theme-with-syntax-variables'])
      })

      waitsFor(() => didChangeActiveThemesHandler.callCount > 0)

      runs(function () {
        // `theme-` twice as it prefixes the name with `theme-`
        expect(workspaceElement).toHaveClass('theme-theme-with-ui-variables')
        expect(workspaceElement).toHaveClass('theme-theme-with-syntax-variables')
        expect(workspaceElement).not.toHaveClass('theme-atom-dark-ui')
        expect(workspaceElement).not.toHaveClass('theme-atom-dark-syntax')
      })
    })
  })

  describe('when a theme fails to load', () =>
    it('logs a warning', function () {
      console.warn.reset()
      atom.packages.activatePackage('a-theme-that-will-not-be-found').then(function () {}, function () {})
      expect(console.warn.callCount).toBe(1)
      expect(console.warn.argsForCall[0][0]).toContain("Could not resolve 'a-theme-that-will-not-be-found'")
    })
  )

  describe('::requireStylesheet(path)', function () {
    beforeEach(() => jasmine.snapshotDeprecations())

    afterEach(() => jasmine.restoreDeprecationsSnapshot())

    it('synchronously loads css at the given path and installs a style tag for it in the head', function () {
      let styleElementAddedHandler
      atom.styles.onDidAddStyleElement(styleElementAddedHandler = jasmine.createSpy('styleElementAddedHandler'))

      const cssPath = getAbsolutePath(atom.project.getDirectories()[0], 'css.css')
      const lengthBefore = document.querySelectorAll('head style').length

      atom.themes.requireStylesheet(cssPath)
      expect(document.querySelectorAll('head style').length).toBe(lengthBefore + 1)

      expect(styleElementAddedHandler).toHaveBeenCalled()

      const element = document.querySelector('head style[source-path*="css.css"]')
      expect(element.getAttribute('source-path')).toEqualPath(cssPath)
      expect(element.textContent).toBe(fs.readFileSync(cssPath, 'utf8'))

      // doesn't append twice
      styleElementAddedHandler.reset()
      atom.themes.requireStylesheet(cssPath)
      expect(document.querySelectorAll('head style').length).toBe(lengthBefore + 1)
      expect(styleElementAddedHandler).not.toHaveBeenCalled()

      document.querySelectorAll('head style[id*="css.css"]').forEach((styleElement) => {
        styleElement.remove()
      })
    })

    it('synchronously loads and parses less files at the given path and installs a style tag for it in the head', function () {
      const lessPath = getAbsolutePath(atom.project.getDirectories()[0], 'sample.less')
      const lengthBefore = document.querySelectorAll('head style').length
      atom.themes.requireStylesheet(lessPath)
      expect(document.querySelectorAll('head style').length).toBe(lengthBefore + 1)

      const element = document.querySelector('head style[source-path*="sample.less"]')
      expect(element.getAttribute('source-path')).toEqualPath(lessPath)
      expect(element.textContent.toLowerCase()).toBe(`\
#header {
  color: #4d926f;
}
h2 {
  color: #4d926f;
}
\
`
      )

      // doesn't append twice
      atom.themes.requireStylesheet(lessPath)
      expect(document.querySelectorAll('head style').length).toBe(lengthBefore + 1)
      document.querySelectorAll('head style[id*="sample.less"]').forEach((styleElement) => {
        styleElement.remove()
      })
    })

    it('supports requiring css and less stylesheets without an explicit extension', function () {
      atom.themes.requireStylesheet(path.join(__dirname, 'fixtures', 'css'))
      expect(document.querySelector('head style[source-path*="css.css"]').getAttribute('source-path'))
        .toEqualPath(getAbsolutePath(atom.project.getDirectories()[0], 'css.css'))
      atom.themes.requireStylesheet(path.join(__dirname, 'fixtures', 'sample'))
      expect(document.querySelector('head style[source-path*="sample.less"]').getAttribute('source-path'))
        .toEqualPath(getAbsolutePath(atom.project.getDirectories()[0], 'sample.less'))

      document.querySelector('head style[source-path*="css.css"]').remove()
      document.querySelector('head style[source-path*="sample.less"]').remove()
    })

    it('returns a disposable allowing styles applied by the given path to be removed', function () {
      const cssPath = require.resolve('./fixtures/css.css')

      expect(getComputedStyle(document.body).fontWeight).not.toBe('bold')
      const disposable = atom.themes.requireStylesheet(cssPath)
      expect(getComputedStyle(document.body).fontWeight).toBe('bold')

      let styleElementRemovedHandler
      atom.styles.onDidRemoveStyleElement(styleElementRemovedHandler = jasmine.createSpy('styleElementRemovedHandler'))

      disposable.dispose()

      expect(getComputedStyle(document.body).fontWeight).not.toBe('bold')

      expect(styleElementRemovedHandler).toHaveBeenCalled()
    })
  })

  describe('base style sheet loading', function () {
    beforeEach(function () {
      const workspaceElement = atom.workspace.getElement()
      jasmine.attachToDOM(atom.workspace.getElement())
      workspaceElement.appendChild(document.createElement('atom-text-editor'))

      waitsForPromise(() => atom.themes.activateThemes())
    })

    it("loads the correct values from the theme's ui-variables file", function () {
      let didChangeActiveThemesHandler
      atom.themes.onDidChangeActiveThemes(didChangeActiveThemesHandler = jasmine.createSpy())
      atom.config.set('core.themes', ['theme-with-ui-variables', 'theme-with-syntax-variables'])

      waitsFor(() => didChangeActiveThemesHandler.callCount > 0)

      runs(function () {
        // an override loaded in the base css
        expect(getComputedStyle(atom.workspace.getElement())['background-color']).toBe('rgb(0, 0, 255)')

        // from within the theme itself
        expect(getComputedStyle(document.querySelector('atom-text-editor')).paddingTop).toBe('150px')
        expect(getComputedStyle(document.querySelector('atom-text-editor')).paddingRight).toBe('150px')
        expect(getComputedStyle(document.querySelector('atom-text-editor')).paddingBottom).toBe('150px')
      })
    })

    describe('when there is a theme with incomplete variables', () =>
      it('loads the correct values from the fallback ui-variables', function () {
        let didChangeActiveThemesHandler
        atom.themes.onDidChangeActiveThemes(didChangeActiveThemesHandler = jasmine.createSpy())
        atom.config.set('core.themes', ['theme-with-incomplete-ui-variables', 'theme-with-syntax-variables'])

        waitsFor(() => didChangeActiveThemesHandler.callCount > 0)

        runs(function () {
          // an override loaded in the base css
          expect(getComputedStyle(atom.workspace.getElement())['background-color']).toBe('rgb(0, 0, 255)')

          // from within the theme itself
          expect(getComputedStyle(document.querySelector('atom-text-editor')).backgroundColor).toBe('rgb(0, 152, 255)')
        })
      })
    )
  })

  describe('user stylesheet', function () {
    let userStylesheetPath
    beforeEach(function () {
      userStylesheetPath = path.join(temp.mkdirSync('atom'), 'styles.less')
      fs.writeFileSync(userStylesheetPath, 'body {border-style: dotted !important;}')
      spyOn(atom.styles, 'getUserStyleSheetPath').andReturn(userStylesheetPath)
    })

    describe('when the user stylesheet changes', function () {
      beforeEach(() => jasmine.snapshotDeprecations())

      afterEach(() => jasmine.restoreDeprecationsSnapshot())

      it('reloads it', function () {
        let styleElementAddedHandler, styleElementRemovedHandler

        waitsForPromise(() => atom.themes.activateThemes())

        runs(function () {
          atom.styles.onDidRemoveStyleElement(styleElementRemovedHandler = jasmine.createSpy('styleElementRemovedHandler'))
          atom.styles.onDidAddStyleElement(styleElementAddedHandler = jasmine.createSpy('styleElementAddedHandler'))

          spyOn(atom.themes, 'loadUserStylesheet').andCallThrough()

          expect(getComputedStyle(document.body).borderStyle).toBe('dotted')
          fs.writeFileSync(userStylesheetPath, 'body {border-style: dashed}')
        })

        waitsFor(() => atom.themes.loadUserStylesheet.callCount === 1)

        runs(function () {
          expect(getComputedStyle(document.body).borderStyle).toBe('dashed')

          expect(styleElementRemovedHandler).toHaveBeenCalled()
          expect(styleElementRemovedHandler.argsForCall[0][0].textContent).toContain('dotted')

          expect(styleElementAddedHandler).toHaveBeenCalled()
          expect(styleElementAddedHandler.argsForCall[0][0].textContent).toContain('dashed')

          styleElementRemovedHandler.reset()
          fs.removeSync(userStylesheetPath)
        })

        waitsFor(() => atom.themes.loadUserStylesheet.callCount === 2)

        runs(function () {
          expect(styleElementRemovedHandler).toHaveBeenCalled()
          expect(styleElementRemovedHandler.argsForCall[0][0].textContent).toContain('dashed')
          expect(getComputedStyle(document.body).borderStyle).toBe('none')
        })
      })
    })

    describe('when there is an error reading the stylesheet', function () {
      let addErrorHandler = null
      beforeEach(function () {
        atom.themes.loadUserStylesheet()
        spyOn(atom.themes.lessCache, 'cssForFile').andCallFake(function () {
          throw new Error('EACCES permission denied "styles.less"')
        })
        atom.notifications.onDidAddNotification(addErrorHandler = jasmine.createSpy())
      })

      it('creates an error notification and does not add the stylesheet', function () {
        atom.themes.loadUserStylesheet()
        expect(addErrorHandler).toHaveBeenCalled()
        const note = addErrorHandler.mostRecentCall.args[0]
        expect(note.getType()).toBe('error')
        expect(note.getMessage()).toContain('Error loading')
        expect(atom.styles.styleElementsBySourcePath[atom.styles.getUserStyleSheetPath()]).toBeUndefined()
      })
    })

    describe('when there is an error watching the user stylesheet', function () {
      let addErrorHandler = null
      beforeEach(function () {
        const {File} = require('pathwatcher')
        spyOn(File.prototype, 'on').andCallFake(function (event) {
          if (event.indexOf('contents-changed') > -1) {
            throw new Error('Unable to watch path')
          }
        })
        spyOn(atom.themes, 'loadStylesheet').andReturn('')
        atom.notifications.onDidAddNotification(addErrorHandler = jasmine.createSpy())
      })

      it('creates an error notification', function () {
        atom.themes.loadUserStylesheet()
        expect(addErrorHandler).toHaveBeenCalled()
        const note = addErrorHandler.mostRecentCall.args[0]
        expect(note.getType()).toBe('error')
        expect(note.getMessage()).toContain('Unable to watch path')
      })
    })

    it("adds a notification when a theme's stylesheet is invalid", function () {
      const addErrorHandler = jasmine.createSpy()
      atom.notifications.onDidAddNotification(addErrorHandler)
      expect(() => atom.packages.activatePackage('theme-with-invalid-styles').then(function () {}, function () {})).not.toThrow()
      expect(addErrorHandler.callCount).toBe(2)
      expect(addErrorHandler.argsForCall[1][0].message).toContain('Failed to activate the theme-with-invalid-styles theme')
    })
  })

  describe('when a non-existent theme is present in the config', function () {
    beforeEach(function () {
      console.warn.reset()
      atom.config.set('core.themes', ['non-existent-dark-ui', 'non-existent-dark-syntax'])

      waitsForPromise(() => atom.themes.activateThemes())
    })

    it('uses the default dark UI and syntax themes and logs a warning', function () {
      const activeThemeNames = atom.themes.getActiveThemeNames()
      expect(console.warn.callCount).toBe(2)
      expect(activeThemeNames.length).toBe(2)
      expect(activeThemeNames).toContain('atom-dark-ui')
      expect(activeThemeNames).toContain('atom-dark-syntax')
    })
  })

  describe('when in safe mode', function () {
    describe('when the enabled UI and syntax themes are bundled with Atom', function () {
      beforeEach(function () {
        atom.config.set('core.themes', ['atom-light-ui', 'atom-dark-syntax'])

        waitsForPromise(() => atom.themes.activateThemes())
      })

      it('uses the enabled themes', function () {
        const activeThemeNames = atom.themes.getActiveThemeNames()
        expect(activeThemeNames.length).toBe(2)
        expect(activeThemeNames).toContain('atom-light-ui')
        expect(activeThemeNames).toContain('atom-dark-syntax')
      })
    })

    describe('when the enabled UI and syntax themes are not bundled with Atom', function () {
      beforeEach(function () {
        atom.config.set('core.themes', ['installed-dark-ui', 'installed-dark-syntax'])

        waitsForPromise(() => atom.themes.activateThemes())
      })

      it('uses the default dark UI and syntax themes', function () {
        const activeThemeNames = atom.themes.getActiveThemeNames()
        expect(activeThemeNames.length).toBe(2)
        expect(activeThemeNames).toContain('atom-dark-ui')
        expect(activeThemeNames).toContain('atom-dark-syntax')
      })
    })

    describe('when the enabled UI theme is not bundled with Atom', function () {
      beforeEach(function () {
        atom.config.set('core.themes', ['installed-dark-ui', 'atom-light-syntax'])

        waitsForPromise(() => atom.themes.activateThemes())
      })

      it('uses the default dark UI theme', function () {
        const activeThemeNames = atom.themes.getActiveThemeNames()
        expect(activeThemeNames.length).toBe(2)
        expect(activeThemeNames).toContain('atom-dark-ui')
        expect(activeThemeNames).toContain('atom-light-syntax')
      })
    })

    describe('when the enabled syntax theme is not bundled with Atom', function () {
      beforeEach(function () {
        atom.config.set('core.themes', ['atom-light-ui', 'installed-dark-syntax'])

        waitsForPromise(() => atom.themes.activateThemes())
      })

      it('uses the default dark syntax theme', function () {
        const activeThemeNames = atom.themes.getActiveThemeNames()
        expect(activeThemeNames.length).toBe(2)
        expect(activeThemeNames).toContain('atom-light-ui')
        expect(activeThemeNames).toContain('atom-dark-syntax')
      })
    })
  })
})

function getAbsolutePath (directory, relativePath) {
  if (directory) {
    return directory.resolve(relativePath)
  }
}