From 148650695bb6dce79e9f0ba1fe78e05b92200f52 Mon Sep 17 00:00:00 2001
From: Daniel <dhaavi@users.noreply.github.com>
Date: Tue, 12 Sep 2023 16:38:22 +0200
Subject: [PATCH] Add first method to merge profiles

---
 profile/merge.go | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 profile/merge.go

diff --git a/profile/merge.go b/profile/merge.go
new file mode 100644
index 00000000..2a734a2a
--- /dev/null
+++ b/profile/merge.go
@@ -0,0 +1,84 @@
+package profile
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/safing/portbase/database/record"
+)
+
+// MergeProfiles merges multiple profiles into a new one.
+// The new profile is saved and returned.
+// Only the icon and fingerprints are inherited from other profiles.
+// All other information is taken only from the primary profile.
+func MergeProfiles(primary *Profile, secondaries ...*Profile) (newProfile *Profile, err error) {
+	// Fill info from primary profile.
+	newProfile = &Profile{
+		Base:                record.Base{},
+		RWMutex:             sync.RWMutex{},
+		ID:                  "", // Omit ID to derive it from the new fingerprints.
+		Source:              primary.Source,
+		Name:                primary.Name,
+		Description:         primary.Description,
+		Homepage:            primary.Homepage,
+		UsePresentationPath: false, // Disable presentation path.
+		SecurityLevel:       primary.SecurityLevel,
+		Config:              primary.Config,
+	}
+
+	// Collect all icons.
+	newProfile.Icons = make([]Icon, 0, len(secondaries)+1) // Guess the needed space.
+	newProfile.Icons = append(newProfile.Icons, primary.Icons...)
+	for _, sp := range secondaries {
+		newProfile.Icons = append(newProfile.Icons, sp.Icons...)
+	}
+	sortIcons(newProfile.Icons)
+
+	// Collect all fingerprints.
+	newProfile.Fingerprints = make([]Fingerprint, 0, len(secondaries)+1) // Guess the needed space.
+	newProfile.Fingerprints = addFingerprints(newProfile.Fingerprints, primary.Fingerprints, primary.ScopedID())
+	for _, sp := range secondaries {
+		newProfile.Fingerprints = addFingerprints(newProfile.Fingerprints, sp.Fingerprints, sp.ScopedID())
+	}
+	sortFingerprints(newProfile.Fingerprints)
+
+	// Save new profile.
+	newProfile = New(newProfile)
+	err = newProfile.Save()
+	if err != nil {
+		return nil, fmt.Errorf("failed to save merged profile: %w", err)
+	}
+	// FIXME: Should we ... ?
+	// newProfile.updateMetadata()
+	// newProfile.updateMetadataFromSystem()
+
+	// Delete all previous profiles.
+	// FIXME:
+	/*
+		primary.Meta().Delete()
+		// Set as outdated and remove from active profiles.
+		// Signify that profile was deleted and save for sync.
+		for _, sp := range secondaries {
+			sp.Meta().Delete()
+			// Set as outdated and remove from active profiles.
+			// Signify that profile was deleted and save for sync.
+		}
+	*/
+
+	return newProfile, nil
+}
+
+func addFingerprints(existing, add []Fingerprint, from string) []Fingerprint {
+	// Copy all fingerprints and add the they are from.
+	for _, addFP := range add {
+		existing = append(existing, Fingerprint{
+			Type:       addFP.Type,
+			Key:        addFP.Key,
+			Operation:  addFP.Operation,
+			Value:      addFP.Value,
+			MergedFrom: from,
+		})
+	}
+
+	return existing
+}