From 7116826b854188604e21e2a613ac6672b6fd81f3 Mon Sep 17 00:00:00 2001
From: Marius Peter <dev@marius-peter.com>
Date: Mon, 8 Sep 2025 21:21:56 +0200
Subject: Create Target and nutrient target table on dashboard.

---
 app/models/nutrient_measurement.rb | 14 +++++++++++++
 app/models/nutrient_profile.rb     | 11 ++++++++++
 app/models/target.rb               | 42 ++++++++++++++++++++++++++++++++++++++
 app/models/target_allocation.rb    |  7 +++++++
 4 files changed, 74 insertions(+)
 create mode 100644 app/models/target.rb
 create mode 100644 app/models/target_allocation.rb

(limited to 'app/models')

diff --git a/app/models/nutrient_measurement.rb b/app/models/nutrient_measurement.rb
index f1d6d5b..1139af7 100644
--- a/app/models/nutrient_measurement.rb
+++ b/app/models/nutrient_measurement.rb
@@ -1,4 +1,18 @@
 class NutrientMeasurement < ApplicationRecord
+  NUTRIENT_FIELDS = %i[
+    nno3 p k ca mg s na cl si fe zn b mn cu mo nnh4
+  ].freeze
+
   validates :measured_on, presence: true
   validates :measured_on, uniqueness: true
+
+  def self.data_series_for(*nutrients)
+    nutrients.map do |formula|
+      { name: formula, data: self.order(:measured_on).pluck(:measured_on, formula) }
+    end
+  end
+
+  def self.nutrient_fields
+    NUTRIENT_FIELDS
+  end
 end
diff --git a/app/models/nutrient_profile.rb b/app/models/nutrient_profile.rb
index 22f2704..0610855 100644
--- a/app/models/nutrient_profile.rb
+++ b/app/models/nutrient_profile.rb
@@ -1,2 +1,13 @@
 class NutrientProfile < ApplicationRecord
+  # Align these keys with your schema columns (per your schema.txt)
+  NUTRIENT_KEYS = %i[
+    nno3 p k ca mg s na cl si fe zn b mn cu mo nnh4
+  ].freeze
+
+  # Returns a Hash of nutrient => numeric requirement (nil kept; caller can skip nils)
+  def requirements_hash
+    attributes
+      .slice(*NUTRIENT_KEYS.map(&:to_s)) # only nutrient columns
+      .transform_keys(&:to_s)
+  end
 end
diff --git a/app/models/target.rb b/app/models/target.rb
new file mode 100644
index 0000000..3063b42
--- /dev/null
+++ b/app/models/target.rb
@@ -0,0 +1,42 @@
+# app/models/target.rb
+class Target < ApplicationRecord
+  has_many :target_allocations, dependent: :destroy
+  has_many :nutrient_profiles, through: :target_allocations
+
+  accepts_nested_attributes_for :target_allocations, allow_destroy: true
+  validate :percentages_sum_to_100
+
+  def weighted_requirements
+    totals = Hash.new(0.0)
+    denom  = 100.0
+
+    target_allocations.includes(:nutrient_profile).each do |alloc|
+      profile = alloc.nutrient_profile
+      next unless profile
+
+      weight = (alloc.percentage || 0).to_f / denom
+      next if weight <= 0
+
+      # Prefer the helper, but gracefully fall back to slicing attributes.
+      reqs = if profile.respond_to?(:requirements_hash)
+               profile.requirements_hash
+      else
+               profile.attributes.slice(*NutrientProfile::NUTRIENT_KEYS.map(&:to_s))
+      end
+
+      reqs.each do |nutrient_key, value|
+        next if value.nil?
+        totals[nutrient_key.to_s] += value.to_f * weight
+      end
+    end
+
+    totals
+  end
+
+  private
+
+  def percentages_sum_to_100
+    sum = target_allocations.reject(&:marked_for_destruction?).sum { |a| a.percentage.to_f }
+    errors.add(:base, "La somme des pourcentages doit être égale à 100%") unless (sum - 100.0).abs <= 0.01
+  end
+end
diff --git a/app/models/target_allocation.rb b/app/models/target_allocation.rb
new file mode 100644
index 0000000..6aa1dcb
--- /dev/null
+++ b/app/models/target_allocation.rb
@@ -0,0 +1,7 @@
+class TargetAllocation < ApplicationRecord
+  belongs_to :target
+  belongs_to :nutrient_profile
+
+  validates :percentage, numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 100 }
+  validates :nutrient_profile_id, uniqueness: { scope: :target_id }
+end
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