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<?php |
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/** |
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* Party Class |
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* |
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* @package TheyWorkForYou |
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*/ |
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namespace MySociety\TheyWorkForYou; |
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/** |
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* Party |
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*/ |
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class Party { |
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public $name; |
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private $db; |
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public function __construct($name) { |
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// treat Labour and Labour/Co-operative the same as that's how |
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// people view them and it'll confuse the results otherwise |
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if ( $name == 'Labour/Co-operative' ) { |
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$name = 'Labour'; |
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} |
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$this->name = $name; |
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$this->db = new \ParlDB; |
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} |
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public function getCurrentMemberCount($house) { |
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$member_count = $this->db->query( |
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"SELECT count(*) as num_members |
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FROM member |
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WHERE |
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party = :party |
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AND house = :house |
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AND entered_house <= :date |
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AND left_house >= :date", |
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array( |
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':party' => $this->name, |
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':house' => $house, |
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':date' => date('Y-m-d'), |
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) |
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)->first(); |
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if ($member_count) { |
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$num_members = $member_count['num_members']; |
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return $num_members; |
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} else { |
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return 0; |
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} |
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} |
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public function getAllPolicyPositions($policies) { |
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$positions = $this->fetchPolicyPositionsByMethod($policies, "policy_position"); |
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return $positions; |
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} |
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public function policy_position($policy_id) { |
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$position = $this->db->query( |
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"SELECT score, divisions, date_min, date_max |
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FROM partypolicy |
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WHERE |
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party = :party |
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AND house = 1 |
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AND policy_id = :policy_id", |
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array( |
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':party' => $this->name, |
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':policy_id' => $policy_id |
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) |
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)->first(); |
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if ($position) { |
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$position['position'] = score_to_strongly($position['score']); |
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return $position; |
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} else { |
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return null; |
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} |
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} |
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public function calculateAllPolicyPositions($policies) { |
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$positions = $this->fetchPolicyPositionsByMethod($policies, "calculate_policy_position"); |
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return $positions; |
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} |
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public function calculate_policy_position($policy_id) { |
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// This could be done as a join but it turns out to be |
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// much slower to do that |
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$divisions = $this->db->query( |
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"SELECT division_id, division_date, policy_vote |
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FROM policydivisions |
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JOIN divisions USING(division_id) |
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WHERE policy_id = :policy_id |
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AND house = 'commons'", |
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array( |
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':policy_id' => $policy_id |
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) |
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); |
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$score = 0; |
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$max_score = 0; |
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$total_votes = 0; |
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$date_min = ''; |
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$date_max = ''; |
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$num_divisions = 0; |
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$party_where = 'party = :party'; |
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$params = array( |
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':party' => $this->name |
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); |
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if ( $this->name == 'Labour' ) { |
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$party_where = '( party = :party OR party = :party2 )'; |
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$params = array( |
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':party' => $this->name, |
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':party2' => 'Labour/Co-operative' |
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); |
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} |
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foreach ($divisions as $division) { |
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$division_id = $division['division_id']; |
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$weights = $this->get_vote_scores($division['policy_vote']); |
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$date = $division['division_date']; |
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$params[':division_id'] = $division_id; |
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$votes = $this->db->query( |
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"SELECT count(*) as num_votes, vote |
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FROM persondivisionvotes |
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JOIN member ON persondivisionvotes.person_id = member.person_id |
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WHERE |
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$party_where |
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AND member.house = 1 |
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AND division_id = :division_id |
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AND left_house = '9999-12-31' |
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GROUP BY vote", |
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$params |
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); |
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$num_votes = 0; |
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foreach ($votes as $vote) { |
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$vote_dir = $vote['vote']; |
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if ( $vote_dir == '' ) continue; |
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if ( $vote_dir == 'tellno' ) $vote_dir = 'no'; |
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if ( $vote_dir == 'tellaye' ) $vote_dir = 'aye'; |
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$num_votes += $vote['num_votes']; |
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$score += ($vote['num_votes'] * $weights[$vote_dir]); |
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} |
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# For range, only care if there were results |
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if ($votes->rows()) { |
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if (!$date_min || $date_min > $date) $date_min = $date; |
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if (!$date_max || $date_max < $date) $date_max = $date; |
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$num_divisions++; |
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} |
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$total_votes += $num_votes; |
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$max_score += $num_votes * max( array_values( $weights ) ); |
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} |
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if ( $total_votes == 0 ) { |
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return null; |
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} |
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// this implies that all the divisions in the policy have a policy |
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// position of absent so we set weight to -1 to indicate we can't |
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// really say what the parties position is. |
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if ( $max_score == 0 ) { |
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$weight = -1; |
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} else { |
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$weight = 1 - ( $score/$max_score ); |
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} |
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$score_desc = score_to_strongly($weight); |
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return [ |
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'score' => $weight, |
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'position' => $score_desc, |
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'divisions' => $num_divisions, |
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'date_min' => $date_min, |
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'date_max' => $date_max, |
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]; |
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} |
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public function cache_position( $position ) { |
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$this->db->query( |
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"REPLACE INTO partypolicy |
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(party, house, policy_id, score, divisions, date_min, date_max) |
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VALUES (:party, 1, :policy_id, :score, :divisions, :date_min, :date_max)", |
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array( |
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':score' => $position['score'], |
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':party' => $this->name, |
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':policy_id' => $position['policy_id'], |
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':divisions' => $position['divisions'], |
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':date_min' => $position['date_min'], |
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':date_max' => $position['date_max'], |
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) |
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); |
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} |
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private function fetchPolicyPositionsByMethod($policies, $method) { |
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$positions = array(); |
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if ($this->name == 'Independent') { |
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return $positions; |
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} |
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foreach ( $policies->getPolicies() as $policy_id => $policy_text ) { |
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$data = $this->$method($policy_id); |
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if ( $data === null ) { |
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continue; |
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} |
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$data['policy_id'] = $policy_id; |
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$data['desc'] = $policy_text; |
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$positions[$policy_id] = $data; |
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} |
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return $positions; |
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} |
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private function get_vote_scores($vote) { |
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$absent = 1; |
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$both = 1; |
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$agree = 10; |
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if ( stripos($vote, '3') !== FALSE ) { |
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$agree = 50; |
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$absent = 25; |
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$both = 25; |
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} |
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$scores = array( |
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'absent' => $absent, |
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'both' => $both |
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); |
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if ( stripos($vote, 'aye') !== FALSE ) { |
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$scores['aye'] = $agree; |
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$scores['no'] = 0; |
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} else if ( stripos($vote, 'no') !== FALSE ) { |
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$scores['no'] = $agree; |
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$scores['aye'] = 0; |
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} else { |
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$scores['both'] = 0; |
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$scores['absent'] = 0; |
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$scores['no'] = 0; |
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$scores['aye'] = 0; |
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} |
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return $scores; |
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} |
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public static function getParties() { |
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$db = new \ParlDB; |
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$party_list = $db->query( |
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"SELECT DISTINCT party FROM member WHERE party <> ''" |
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); |
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$parties = array(); |
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foreach ($party_list as $row) { |
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$party = $row['party']; |
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if ( |
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!$party |
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|| $party == 'Independent' |
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|| $party == 'Crossbench' |
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) { |
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continue; |
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} |
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$parties[] = $party; |
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} |
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return $parties; |
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} |
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} |
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mysociety /
theyworkforyou
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