const languages = require('./languages')

const context = {
  type: 'object',
  additionalProperties: false,
  required: [
    'event_id',
    'user',
    'version',
    'created',
    'path'
  ],
  properties: {
    // Required of all events
    event_id: {
      type: 'string',
      description: 'The unique identifier of the event.',
      format: 'uuid'
    },
    user: {
      type: 'string',
      description: 'The unique identifier of the current user performing the event. Please use randomly generated values or hashed values; we don\'t want to be able to look up in a database.',
      format: 'uuid'
    },
    version: {
      type: 'string',
      description: 'The version of the event schema.',
      pattern: '^\\d+(\\.\\d+)?(\\.\\d+)?$' // eslint-disable-line
    },
    created: {
      type: 'string',
      format: 'date-time',
      description: 'The time we created the event; please reference UTC.'
    },

    // Content information
    path: {
      type: 'string',
      description: 'The browser value of `location.pathname`.',
      format: 'uri-reference'
    },
    referrer: {
      type: 'string',
      description: 'The browser value of `document.referrer`.',
      format: 'uri-reference'
    },
    search: {
      type: 'string',
      description: 'The browser value of `location.search`.'
    },
    href: {
      type: 'string',
      description: 'The browser value of `location.href`.',
      format: 'uri'
    },
    site_language: {
      type: 'string',
      description: 'The language the user is viewing.',
      enum: Object.keys(languages)
    },

    // Device information
    os: {
      type: 'string',
      description: 'The type of operating system the user is working with.',
      enum: ['windows', 'mac', 'linux', 'ios', 'android', 'other'],
      default: 'other'
    },
    os_version: {
      type: 'string',
      description: 'The version of the operating system the user is using.'
    },
    browser: {
      type: 'string',
      description: 'The type of browser the user is browsing with.',
      enum: ['chrome', 'safari', 'firefox', 'edge', 'ie', 'other'],
      default: 'other'
    },
    browser_version: {
      type: 'string',
      description: 'The version of the browser the user is browsing with.'
    },
    viewport_width: {
      type: 'number',
      description: 'The viewport width, not the overall device size.',
      minimum: 1
    },
    viewport_height: {
      type: 'number',
      description: 'The viewport height, not the overall device height.',
      minimum: 1
    },

    // Location information
    timezone: {
      type: 'number',
      description: 'The timezone the user is in, as `new Date().getTimezoneOffset() / -60`.'
    },
    user_language: {
      type: 'string',
      description: 'The browser value of `navigator.language`.'
    }
  }
}

const pageSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^page$'
    },
    page_render_duration: {
      type: 'number',
      description: 'How long the server took to render the page content, in seconds.',
      minimum: 0.001
    }
  }
}

const exitSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context',
    'exit_page_id'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^exit$'
    },
    exit_page_id: {
      type: 'string',
      format: 'uuid',
      description: 'The value of the corresponding `page` event.'
      // id of the "page" event
    },
    exit_first_paint: {
      type: 'number',
      minimum: 0.001,
      description: 'The duration until `first-contentful-paint`, in seconds. Informs CSS performance.'
    },
    exit_dom_interactive: {
      type: 'number',
      minimum: 0.001,
      description: 'The duration until `PerformanceNavigationTiming.domInteractive`, in seconds. Informs JavaScript loading performance.'
    },
    exit_dom_complete: {
      type: 'number',
      minimum: 0.001,
      description: 'The duration until `PerformanceNavigationTiming.domComplete`, in seconds. Informs JavaScript execution performance.'
    },
    exit_visit_duration: {
      type: 'number',
      minimum: 0.001,
      description: 'The duration of exit.timestamp - page.timestamp, in seconds. Informs bounce rate.'
    },
    exit_scroll_length: {
      type: 'number',
      minimum: 0,
      maximum: 1,
      description: 'The percentage of how far the user scrolled on the page.'
    }
  }
}

const linkSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context',
    'link_url'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^link$'
    },
    link_url: {
      type: 'string',
      format: 'uri',
      description: 'The href of the anchor tag the user clicked, or the page or object they directed their browser to.'
    }
  }
}

const searchSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context',
    'search_query'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^search$'
    },
    search_query: {
      type: 'string',
      description: 'The actual text content of the query string the user sent to the service.'
    },
    search_context: {
      type: 'string',
      description: 'Any additional search context, such as component searched.'
    }
  }
}

const navigateSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^navigate$'
    },
    navigate_label: {
      type: 'string',
      description: 'An identifier for where the user is navigating.'
    }
  }
}

const surveySchema = {
  additionalProperties: false,
  required: [
    'type',
    'context',
    'survey_vote'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^survey$'
    },
    token: {
      type: 'string',
      description: 'A honeypot.',
      maxLength: 0
    },
    survey_vote: {
      type: 'boolean',
      description: 'Whether the user found the page helpful.'
    },
    survey_comment: {
      type: 'string',
      description: 'Any textual comments the user wanted to provide.'
    },
    survey_email: {
      type: 'string',
      format: 'email',
      description: 'The user\'s email address, if the user provided and consented.'
    }
  }
}

const experimentSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context',
    'experiment_name',
    'experiment_variation'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^experiment$'
    },
    experiment_name: {
      type: 'string',
      description: 'The test that this event is part of.'
    },
    experiment_variation: {
      type: 'string',
      enum: ['control', 'treatment'],
      description: 'The variation this user we bucketed in, such as control or treatment.'
    },
    experiment_success: {
      type: 'boolean',
      default: true,
      description: 'Whether or not the user successfully performed the test goal.'
    }
  }
}

const redirectSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context',
    'redirect_from',
    'redirect_to'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^redirect$'
    },
    redirect_from: {
      type: 'string',
      description: 'The requested href.',
      format: 'uri-reference'
    },
    redirect_to: {
      type: 'string',
      description: 'The destination href of the redirect.',
      format: 'uri-reference'
    }
  }
}

const clipboardSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context',
    'clipboard_operation'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^clipboard$'
    },
    clipboard_operation: {
      type: 'string',
      description: 'Which clipboard operation the user is performing.',
      enum: ['copy', 'paste', 'cut']
    }
  }
}

const printSchema = {
  additionalProperties: false,
  required: [
    'type',
    'context'
  ],
  properties: {
    context,
    type: {
      type: 'string',
      pattern: '^print$'
    }
  }
}

module.exports = {
  oneOf: [
    pageSchema,
    exitSchema,
    linkSchema,
    searchSchema,
    navigateSchema,
    surveySchema,
    experimentSchema,
    redirectSchema,
    clipboardSchema,
    printSchema
  ]
}