admin: Retrieve stats on exercices

libfic/mcq.go

@@ -136,6 +136,31 @@ func (m *MCQ) RecoverId() (Flag, error) {
 	}
 }
 
+// NbTries returns the MCQ resolution statistics.
+func (m *MCQ) NbTries() (tries int64, err error) {
+	err = DBQueryRow("SELECT COUNT(*) AS tries FROM exercice_tries_mcq WHERE id_mcq = ?", m.Id).Scan(&tries)
+	return
+}
+
+func (m *MCQ) TeamsOnIt() ([]int64, error) {
+	if rows, err := DBQuery("SELECT DISTINCT M.id_team FROM exercice_tries_mcq F INNER JOIN exercice_tries T ON T.id_try = F.id_try INNER JOIN teams M ON M.id_team = T.id_team WHERE id_mcq = ?", m.Id); err != nil {
+		return nil, err
+	} else {
+		defer rows.Close()
+
+		teams := []int64{}
+		for rows.Next() {
+			var idteam int64
+			if err := rows.Scan(&idteam); err != nil {
+				return nil, err
+			}
+			teams = append(teams, idteam)
+		}
+
+		return teams, nil
+	}
+}
+
 // Create registers a MCQ into the database and recursively add its entries.
 func (m *MCQ) Create(e *Exercice) (Flag, error) {
 	if res, err := DBExec("INSERT INTO exercice_mcq (id_exercice, ordre, title) VALUES (?, ?, ?)", e.Id, m.Order, m.Title); err != nil {
@@ -319,6 +344,24 @@ func (m *MCQ) IsOptionnal() bool {
 	return false
 }
 
+// Check if the given vals contains at least a response for the given MCQ.
+func (m *MCQ) HasOneEntry(v interface{}) bool {
+	var vals map[int]bool
+	if va, ok := v.(map[int]bool); !ok {
+		return false
+	} else {
+		vals = va
+	}
+
+	for _, n := range m.Entries {
+		if _, ok := vals[n.Id]; ok {
+			return true
+		}
+	}
+
+	return false
+}
+
 // Check if the given vals are the expected ones to validate this flag.
 func (m *MCQ) Check(v interface{}) int {
 	var vals map[int]bool