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/*
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   table structure for module attributes.
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   Three tables; one to categorize attributes, one to hold the attribute names
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   and one to link attribute to device with storage for a value
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*/
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/*
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   Allows us to group attributes into different categories, for example
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   hardware (disk size, cpu, etc...), financial (cost, vendor), network,
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   etc
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*/
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drop table if exists attribute_category;
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create table attribute_category (
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   attribute_category_id int unsigned not null auto_increment,
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   name           varchar(64) comment 'display name for category',
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   primary key    ( attribute_category_id )
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) comment 'categorizes attributes';
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/*
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   this will hold the actual names of the attributes, such as name, uuid, serial number, cpu information, etc...
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*/
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drop table if exists attribute;
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create table attribute (
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   attribute_id   int unsigned not null auto_increment,
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   name           varchar(64) not null comment 'name for display' ,
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   attribute_category_id int unsigned not null,
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   multiples      bool default 0 comment 'if set, multiple instances of the same attribute are allowed',
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   display_in_summary boolean comment 'if true, indicates it should be displayed when device/site/client screen is open',
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   added          date,
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   removed        date default null,
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   primary key    (attribute_id)
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) comment = 'stores attribute names (not values) for other tables';
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/*
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   stores the actual values.
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   NOTE the key field table_id can reference different tables depending
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   on the _base_class_id of attribute in question
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   We can get the first line of a text field with
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   select substring_index( value, '\n',1 ) from attribute_value where ...
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*/
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drop table if exists attribute_value;
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create table attribute_value (
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   attribute_value_id int unsigned not null auto_increment,
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   attribute_id   int unsigned not null references attribute (attribute_id),
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   _base_class_id int unsigned not null references _base_class( _base_class_id),
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   entity_id      int unsigned not null comment 'references ${_base_class}.{id}',
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   value          text null default null comment 'the actual value stored',
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   added          date,
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   removed        date default null,
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   index          (_base_class_id,entity_id),
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   primary key    (attribute_value_id)
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) comment 'attributes for entities (devices, locations, owners)';
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/*
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   some convenience views on the main three tables which might use these, device, site and client
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*/
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drop view if exists view_attribute_owner;
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create view view_attribute_owner as
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   select
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      owner.owner_id,
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      owner.name owner,
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      attribute.name attribute,
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      attribute_value.value,
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      attribute_value.added,
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      attribute_value.removed
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   from
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      attribute_value
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      join attribute using (attribute_id)
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      join attribute_category using (attribute_category_id)
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      join owner on ( attribute_value._base_class_id = owner.owner_id)
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   where
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      attribute_value._base_class_id in (select _base_class_id from _base_class where class_name = 'Owner');
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drop view if exists view_attribute_location;
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create view view_attribute_location as
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   select
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      location.location_id,
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      location.name location,
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      attribute.name attribute,
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      attribute_value.value,
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      attribute_value.added,
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      attribute_value.removed
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   from
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      attribute_value
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      join attribute using (attribute_id)
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      join attribute_category using (attribute_category_id)
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      join location on ( attribute_value._base_class_id = location.location_id)
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   where
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      attribute_value._base_class_id in (select _base_class_id from _base_class where class_name = 'Location');
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drop view if exists view_attribute_device;
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create view view_attribute_device as
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   select
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      device.device_id,
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      device.name device,
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      attribute.name attribute,
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      attribute_value.value,
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      attribute_value.added,
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      attribute_value.removed
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   from
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      attribute_value
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      join attribute using (attribute_id)
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      join attribute_category using (attribute_category_id)
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      join device on ( attribute_value._base_class_id = device.device_id)
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   where
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      attribute_value._base_class_id in (select _base_class_id from _base_class where class_name = 'Device');
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