Create Target and nutrient target table on dashboard.

34 files changed, 649 insertions, 254 deletions

diff --git a/app/controllers/dashboard_controller.rb b/app/controllers/dashboard_controller.rb
index 6f323a9..a315eda 100644
--- a/app/controllers/dashboard_controller.rb
+++ b/app/controllers/dashboard_controller.rb
@@ -10,10 +10,22 @@ class DashboardController < ApplicationController
     # @target = TargetNutrientCalculator.call
 
     # Measurement history table
-    # @measurements = NutrientMeasurement.order(measured_on: :desc).limit(10)
+    @measurements = NutrientMeasurement.order(measured_on: :desc).limit(10)
+    @npk_measurement_data = NutrientMeasurement.data_series_for(:nno3, :p, :k)
+    @ammonium_measurement_data = NutrientMeasurement.data_series_for(:nnh4)
 
-    # @npk_measurement_data = measurement_data_series(:nno3, :p, :k)
-    # @ammonium_measurement_data = measurement_data_series(:nnh4)
+    @weighted = Target.first.weighted_requirements # => { "nno3"=>..., "p"=>..., ... }
+
+    last = NutrientMeasurement.order(measured_on: :desc, created_at: :desc).first
+    @latest_measurements = {}
+
+    if last
+      # Use the same keys as NutrientProfile to keep naming consistent.
+      keys = (NutrientProfile::NUTRIENT_KEYS rescue []).map(&:to_s)
+      keys.each do |k|
+        @latest_measurements[k] = last.send(k) if last.respond_to?(k)
+      end
+    end
   end
 
   private
@@ -35,13 +47,4 @@ class DashboardController < ApplicationController
     unassigned, assigned = data_series.partition { |s| s[:name].casecmp("unassigned").zero? }
     assigned + unassigned
   end
-
-  def measurement_data_series(*nutrients)
-    nutrients.map do |formula|
-      { name: Nutrient.find_by!(formula:).name,
-        data: NutrientMeasurement
-          .order(:measured_on)
-          .pluck(:measured_on, formula) }
-    end
-  end
 end
diff --git a/app/controllers/nutrient_measurements_controller.rb b/app/controllers/nutrient_measurements_controller.rb
new file mode 100644
index 0000000..71ca9e4
--- /dev/null
+++ b/app/controllers/nutrient_measurements_controller.rb
@@ -0,0 +1,26 @@
+class NutrientMeasurementsController < ApplicationController
+  def index
+    @nutrient_measurements = NutrientMeasurement.order(measured_on: :desc)
+    @npk_measurement_data = NutrientMeasurement.data_series_for(:nno3, :p, :k)
+  end
+
+  def new
+    @nutrient_measurement = NutrientMeasurement.new(measured_on: Date.today)
+  end
+
+  def create
+    @measurement = NutrientMeasurement.new(nutrient_measurement_params)
+    if @measurement.save
+      redirect_to @measurement, notice: "Relevé enregistré."
+    else
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+  def nutrient_measurement_params
+    permitted = [ :measured_on ] + NutrientMeasurement::NUTRIENT_FIELDS
+    params.require(:nutrient_measurement).permit(*permitted)
+  end
+end
diff --git a/app/controllers/targets_controller.rb b/app/controllers/targets_controller.rb
new file mode 100644
index 0000000..60d3523
--- /dev/null
+++ b/app/controllers/targets_controller.rb
@@ -0,0 +1,68 @@
+class TargetsController < ApplicationController
+  before_action :set_target, only: %i[show edit update]
+
+  def index
+    @targets = Target.order(:name)
+  end
+
+  def new
+    @target = Target.new(name: "Cible #{Date.today + 1.month}")
+    seed_allocations
+  end
+
+  def create
+    @target = Target.new(target_params)
+    if @target.save
+      redirect_to @target, notice: "Cible enregistrée."
+    else
+      seed_allocations if @target.target_allocations.blank?
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  def edit
+  end
+
+  def update
+    if @target.update(target_params)
+      redirect_to @target, notice: "Cible mise à jour."
+    else
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  def show
+    @weighted = @target.weighted_requirements # => { "nno3"=>..., "p"=>..., ... }
+
+    last = NutrientMeasurement.order(measured_on: :desc, created_at: :desc).first
+    @latest_measurements = {}
+
+    if last
+      # Use the same keys as NutrientProfile to keep naming consistent.
+      keys = (NutrientProfile::NUTRIENT_KEYS rescue []).map(&:to_s)
+      keys.each do |k|
+        @latest_measurements[k] = last.send(k) if last.respond_to?(k)
+      end
+    end
+  end
+
+  private
+
+  def set_target
+    @target = Target.find(params[:id])
+  end
+
+  def seed_allocations
+    existing_ids = @target.target_allocations.map(&:nutrient_profile_id).compact
+    (NutrientProfile.order(:name).pluck(:id) - existing_ids).each do |np_id|
+      @target.target_allocations.build(nutrient_profile_id: np_id, percentage: 12.5)
+    end
+  end
+
+  def target_params
+    params.require(:target).permit(
+      :name,
+      target_allocations_attributes: [ :id, :nutrient_profile_id, :percentage, :_destroy ]
+    )
+  end
+end
diff --git a/app/helpers/targets_helper.rb b/app/helpers/targets_helper.rb
new file mode 100644
index 0000000..8484878
--- /dev/null
+++ b/app/helpers/targets_helper.rb
@@ -0,0 +1,2 @@
+module TargetsHelper
+end
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
diff --git a/app/views/dashboard/_nutrient_measurements.html.erb b/app/views/dashboard/_nutrient_measurements.html.erb
deleted file mode 100644
index bc63a60..0000000
--- a/app/views/dashboard/_nutrient_measurements.html.erb
+++ /dev/null
@@ -1,22 +0,0 @@
-<div class="card shadow mb-4">
-    <div class="card-header d-flex justify-content-between align-items-center">
-	<h5 class="mb-0">Nutrient Measurements</h5>
-	<div class="btn-group">
-	    <%#= link_to "Add new measurement", editor_rafts_path, class: "btn btn-sm btn-primary" %>
-	    <%#= link_to "View all", editor_rafts_path, class: "btn btn-sm btn-secondary" %>
-	</div>
-    </div>
-
-    <div class="card-body p-0">
-	<div class="container mb-3">
-	    <%= line_chart @npk_measurement_data,
-			   title: "NPK",
-			   ytitle: "Concentration (mg/L)" %>
-	</div>
-	<div class="container mb-3">
-	    <%= line_chart @ammonium_measurement_data,
-			   title: "Ammonium",
-			   ytitle: "Concentration (mg/L)" %>
-	</div>
-    </div>
-</div>
diff --git a/app/views/dashboard/_nutrient_measurements_table.html.erb b/app/views/dashboard/_nutrient_measurements_table.html.erb
new file mode 100644
index 0000000..82ea6ff
--- /dev/null
+++ b/app/views/dashboard/_nutrient_measurements_table.html.erb
@@ -0,0 +1,18 @@
+<div class="card shadow my-3">
+    <div class="card-header d-flex justify-content-between align-items-center">
+	<h4 class="mb-0">Relevé des Nutriments</h4>
+	<div class="btn-group">
+	    <%= link_to "Ajouter un relevé", new_nutrient_measurement_path, class: "btn btn-sm btn-primary" %>
+	    <%= link_to "Liste des relevés", nutrient_measurements_path, class: "btn btn-sm btn-secondary" %>
+	</div>
+    </div>
+
+    <div class="card-body">
+	<%= line_chart @npk_measurement_data,
+		       title: "NPK",
+		       ytitle: "Concentration (mg/L)" %>
+	<%= line_chart @ammonium_measurement_data,
+		       title: "Ammonium",
+		       ytitle: "Concentration (mg/L)" %>
+    </div>
+</div>
diff --git a/app/views/dashboard/_nutrient_profile_allocator.html.erb b/app/views/dashboard/_nutrient_profile_allocator.html.erb
deleted file mode 100644
index d402ace..0000000
--- a/app/views/dashboard/_nutrient_profile_allocator.html.erb
+++ /dev/null
@@ -1,187 +0,0 @@
-<%# Props: nutrient_profiles: ActiveRecord::Relation<NutrientProfile> %>
-<%# Fallback if controller didn't set @nutrient_profiles yet %>
-<% profiles = (local_assigns[:nutrient_profiles] || []).presence || [] %>
-
-<%# We'll render a form purely for structure (no real submit yet) %>
-<%= form_with url: "#", method: :post, local: true, html: { id: "np-mix-form", "data-controller": "np-mix" } do %>
-    <div class="card shadow">
-	<div class="card-body">
-
-	    <div class="d-flex justify-content-between align-items-center mb-2">
-		<div class="small text-muted">
-		    Choisissez des <strong>profils de croissance</strong> et répartissez-les pour totaliser <strong>100%</strong>.
-		</div>
-		<div>
-		    Somme&nbsp;: <span id="np-mix-sum" class="badge bg-secondary">0%</span>
-		</div>
-	    </div>
-
-	    <div id="np-mix-rows" class="vstack gap-2">
-		<%# Rows are injected by JS from the template below, including defaults %>
-	    </div>
-
-	    <div class="mt-3 d-flex gap-2">
-		<button type="button" class="btn btn-outline-primary" id="np-mix-add">
-		    + Ajouter un profil
-		</button>
-
-		<%# Placeholder "save" button for later backend wiring; disabled until total == 100 %>
-		<button type="submit" class="btn btn-success ms-auto" id="np-mix-save" disabled>
-		    Enregistrer (à venir)
-		</button>
-	    </div>
-	</div>
-    </div>
-
-    <%# --- Hidden template for a single row --- %>
-    <template id="np-mix-row-template">
-	<div class="np-mix-row d-flex align-items-center gap-2 border rounded p-2">
-	    <button type="button" class="btn btn-outline-danger btn-sm np-mix-delete" aria-label="Supprimer la ligne">
-		Suppr.
-	    </button>
-
-	    <div class="flex-grow-1">
-		<select name="mix[items][][profile_id]" class="form-select form-select-sm np-mix-select" required>
-		    <% if profiles.any? %>
-			<% profiles.each do |p| %>
-			    <option value="<%= p.id %>"><%= p.name %></option>
-			<% end %>
-		    <% else %>
-			<%# If no collection provided yet, at least show placeholders to demo the UI %>
-			<option value="">-- Sélectionner un profil --</option>
-			<option value="gen-croissance">Générique croissance</option>
-			<option value="tomate-cycle">Tomate (cycle entier)</option>
-			<option value="gen-floraison">Générique floraison</option>
-		    <% end %>
-		</select>
-	    </div>
-
-	    <div class="input-group input-group-sm" style="max-width: 140px;">
-		<input type="number"
-		       name="mix[items][][percentage]"
-		       class="form-control text-end np-mix-percent"
-		       min="0" max="100" step="1" value="0" required>
-		<span class="input-group-text">%</span>
-	    </div>
-	</div>
-    </template>
-
-    <%# --- Defaults to inject on load --- %>
-    <script type="application/json" id="np-mix-defaults">
-     {
-	 "items": [
-             { "name": "G\u00E9n\u00E9rique croissance",   "percent": 50 },
-             { "name": "Tomate (cycle entier)",           "percent": 30 },
-             { "name": "G\u00E9n\u00E9rique floraison",   "percent": 20 }
-	 ]
-     }
-    </script>
-
-    <%# --- Tiny inline JS to keep this self-contained (no Stimulus required) --- %>
-    <script>
-     (() => {
-	 const rowsContainer = document.getElementById('np-mix-rows');
-	 const addBtn        = document.getElementById('np-mix-add');
-	 const saveBtn       = document.getElementById('np-mix-save');
-	 const sumBadge      = document.getElementById('np-mix-sum');
-	 const tpl           = document.getElementById('np-mix-row-template');
-	 const defaultsJSON  = document.getElementById('np-mix-defaults')?.textContent || "{}";
-	 const defaults      = JSON.parse(defaultsJSON);
-
-	 function currentSum() {
-             return Array.from(rowsContainer.querySelectorAll('.np-mix-percent'))
-			 .reduce((acc, el) => acc + (parseFloat(el.value) || 0), 0);
-	 }
-
-	 function refreshSum() {
-             const sum = currentSum();
-             sumBadge.textContent = `${sum}%`;
-             sumBadge.classList.remove('bg-secondary','bg-danger','bg-success','bg-warning');
-
-             if (sum === 100) {
-		 sumBadge.classList.add('bg-success');
-		 saveBtn?.removeAttribute('disabled');
-             } else if (sum > 100) {
-		 sumBadge.classList.add('bg-danger');
-		 saveBtn?.setAttribute('disabled', 'disabled');
-             } else {
-		 sumBadge.classList.add('bg-warning');
-		 saveBtn?.setAttribute('disabled', 'disabled');
-             }
-	 }
-
-	 function setSelectByName(selectEl, targetName) {
-             // Try to match by visible name; fall back to first option.
-             const options = Array.from(selectEl.options);
-             const found = options.find(o => o.text.trim().toLowerCase() === String(targetName || '').trim().toLowerCase());
-             if (found) {
-		 selectEl.value = found.value;
-             }
-	 }
-
-	 function installRow({ name = null, percent = 0 } = {}) {
-             const node = tpl.content.firstElementChild.cloneNode(true);
-
-             // Hook up events
-             node.querySelector('.np-mix-delete').addEventListener('click', () => {
-		 node.remove();
-		 refreshSum();
-             });
-
-             const selectEl  = node.querySelector('.np-mix-select');
-             const percentEl = node.querySelector('.np-mix-percent');
-
-             // Default selection (by name) and percent
-             if (name) setSelectByName(selectEl, name);
-             percentEl.value = percent;
-
-             // Input events
-             selectEl.addEventListener('change', () => { /* reserved for later linkage */ });
-             percentEl.addEventListener('input', () => {
-		 // Clamp and refresh
-		 let v = parseFloat(percentEl.value);
-		 if (isNaN(v)) v = 0;
-		 v = Math.max(0, Math.min(100, Math.round(v)));
-		 percentEl.value = v;
-		 refreshSum();
-             });
-
-             rowsContainer.appendChild(node);
-	 }
-
-	 // Init with three defaults
-	 const items = (defaults && defaults.items) ? defaults.items : [];
-	 if (items.length) {
-             items.forEach(it => installRow({ name: it.name, percent: it.percent }));
-	 } else {
-             // Fallback: create three blank rows
-             for (let i = 0; i < 3; i++) installRow();
-	 }
-	 refreshSum();
-
-	 // Add new blank row
-	 addBtn.addEventListener('click', () => {
-             installRow({ name: null, percent: 0 });
-             refreshSum();
-             // Scroll to the new row on mobile for better UX
-             rowsContainer.lastElementChild?.scrollIntoView({ behavior: 'smooth', block: 'center' });
-	 });
-
-	 // Prevent real submit for now (frontend only)
-	 document.getElementById('np-mix-form')?.addEventListener('submit', (e) => {
-             e.preventDefault();
-             // Later: wire to Turbo/JSON post. For now just a gentle nudge.
-             saveBtn.textContent = 'Enregistrer (backend à venir)';
-             saveBtn.blur();
-	 });
-     })();
-    </script>
-
-    <style>
-     /* Small touch targets & tidy spacing on mobile */
-     @media (max-width: 576px) {
-	 .np-mix-row { padding: .5rem; }
-	 .np-mix-row .btn { padding: .25rem .5rem; }
-     }
-    </style>
-<% end %>
diff --git a/app/views/dashboard/_nutrient_target_table.html.erb b/app/views/dashboard/_nutrient_target_table.html.erb
new file mode 100644
index 0000000..7cf294c
--- /dev/null
+++ b/app/views/dashboard/_nutrient_target_table.html.erb
@@ -0,0 +1,74 @@
+<div class="card shadow my-3">
+    <div class="card-header d-flex justify-content-between align-items-center">
+	<h4 class="mb-0">Complémentation</h4>
+	<div class="btn-group">
+	    <%= link_to "Nouvelle cible", new_target_path, class: "btn btn-sm btn-primary" %>
+	    <%= link_to "Voir la recette", root_path, class: "btn btn-sm btn-secondary" %>
+	</div>
+    </div>
+
+    <div class="card-body p-0">
+	<div class="table-responsive">
+	    <table class="table table-sm table-striped table-hover align-middle mb-0">
+		<thead class="table-light">
+		    <tr>
+			<th>Nutriment</th>
+			<th class="text-end">Relevé</th>
+			<th class="text-end">Cible</th>
+			<th class="text-end">Delta</th>
+		    </tr>
+		</thead>
+		<tbody>
+		    <% wr = @weighted || {} %>
+		    <% lm = @latest_measurements || {} %>
+
+		    <% keys = (wr.keys + lm.keys).map(&:to_s).uniq.sort %>
+		    <% keys.each do |nut| %>
+			<% measured = lm[nut] %>
+			<% target   = wr[nut] %>
+			<% delta    = (measured.to_f - target.to_f) if measured || target %>
+			<tr>
+			    <td class="fw-semibold"><%= nut.upcase %></td>
+
+			    <td class="text-end">
+				<% if measured.nil? %>
+				    <span class="text-muted">—</span>
+				<% else %>
+				    <%= number_with_precision(measured, precision: 2) %>
+				<% end %>
+			    </td>
+
+			    <td class="text-end">
+				<% if target.nil? %>
+				    <span class="text-muted">—</span>
+				<% else %>
+				    <%= number_with_precision(target, precision: 2) %>
+				<% end %>
+			    </td>
+
+			    <td class="text-end">
+				<% if measured.nil? && target.nil? %>
+				    <span class="text-muted">—</span>
+				<% else %>
+				    <% badge =
+				    if delta.nil?
+				    "text-bg-secondary"
+				    elsif delta.abs <= 0.01
+				    "text-bg-success"
+				    elsif delta > 0
+				    "text-bg-warning"
+				    else
+				    "text-bg-danger"
+				    end %>
+				    <span class="badge <%= badge %>">
+					<%= number_with_precision(delta.to_f, precision: 2) %>
+				    </span>
+				<% end %>
+			    </td>
+			</tr>
+		    <% end %>
+		</tbody>
+	    </table>
+	</div>
+    </div>
+</div>
diff --git a/app/views/dashboard/_target_table.html.erb b/app/views/dashboard/_target_table.html.erb
index b8f7e66..b1553dc 100644
--- a/app/views/dashboard/_target_table.html.erb
+++ b/app/views/dashboard/_target_table.html.erb
@@ -9,8 +9,7 @@
 	    <thead class="table-light">
 		<tr>
 		    <th scope="col" class="text-nowrap">Nutrient</th>
-		    <th scope="col" class="text-end"> Latest (mg/L)
-		    </th>
+		    <th scope="col" class="text-end"> Latest (mg/L)</th>
 		    <th scope="col" class="text-end">Target (mg/L)</th>
 		    <th scope="col" class="text-end">Δ %</th>
 		</tr>
diff --git a/app/views/dashboard/index.html.erb b/app/views/dashboard/index.html.erb
index b8f9145..a954e4c 100644
--- a/app/views/dashboard/index.html.erb
+++ b/app/views/dashboard/index.html.erb
@@ -1,9 +1,9 @@
 <h1 class="display-1">Ferti</h1>
 
-<%= render "nutrient_profile_allocator", nutrient_profiles: @nutrient_profiles %>
+<%= render "nutrient_target_table", nutrient_profiles: @nutrient_profiles %>
 
 <%#= render "raft_allocation" %>
 
 <%#= render "target_table" %>
 
-<%#= render "nutrient_measurements" %>
+<%= render "nutrient_measurements_table" %>
diff --git a/app/views/nutrient_measurement/index.html.erb b/app/views/nutrient_measurement/index.html.erb
deleted file mode 100644
index d9f522e..0000000
--- a/app/views/nutrient_measurement/index.html.erb
+++ /dev/null
@@ -1,27 +0,0 @@
-<h1>NutrientMeasurement#index</h1>
-<p>Find me in app/views/nutrient_measurement/index.html.erb</p>
-
-<div class="table-responsive">
-    <table class="table table-sm table-striped table-hover align-middle table-nutrient mb-0">
-	<thead class="table-light">
-	    <tr>
-		<th>Date</th>
-		<th class="numeric" title="Total N = NO₃‑N + NH₄‑N">N (total)</th>
-		<th class="numeric">P</th>
-		<th class="numeric">K</th>
-		<th class="numeric" title="Ammonia nitrogen">NH₄‑N</th>
-	    </tr>
-	</thead>
-	<tbody>
-	    <% @measurements.each do |m| %>
-		<tr>
-		    <td><%= l(m.measured_on) %></td>
-		    <td class="numeric"><%= fmt2(total_n(m)) %></td>
-		    <td class="numeric"><%= fmt2(m.p) %></td>
-		    <td class="numeric"><%= fmt2(m.k) %></td>
-		    <td class="numeric"><%= fmt2(m.nnh4) %></td>
-		</tr>
-	    <% end %>
-	</tbody>
-    </table>
-</div>
diff --git a/app/views/nutrient_measurements/_form.html.erb b/app/views/nutrient_measurements/_form.html.erb
new file mode 100644
index 0000000..9689c57
--- /dev/null
+++ b/app/views/nutrient_measurements/_form.html.erb
@@ -0,0 +1,49 @@
+<%= form_with(model: nutrient_measurement) do |form| %>
+    <% if nutrient_measurement.errors.any? %>
+	<div class="alert alert-danger">
+	    <p class="mb-1"><strong><%= pluralize(nutrient_measurement.errors.count, "erreur") %></strong> empêchent l’enregistrement :</p>
+	    <ul class="mb-0">
+		<% nutrient_measurement.errors.full_messages.each do |msg| %>
+		    <li><%= msg %></li>
+		<% end %>
+	    </ul>
+	</div>
+    <% end %>
+
+    <div class="mb-3">
+	<%= form.label :measured_on, "Date du relevé", class: "form-label" %>
+	<%= form.date_field :measured_on, class: "form-control", required: true %>
+    </div>
+
+    <h2 class="h6 mt-4 mb-2">Concentrations de nutriments — laisser vide si non mesuré</h2>
+
+    <div class="row g-2">
+	<% # You can reorganize into macros/micros if you prefer %>
+	<% labels = {
+	    nno3: "Nitrate (N-NO₃)", p: "Phosphore (P)", k: "Potassium (K)",
+	    ca: "Calcium (Ca)", mg: "Magnésium (Mg)", s: "Soufre (S)",
+	    na: "Sodium (Na)", cl: "Chlore (Cl)", si: "Silicium (Si)",
+	    fe: "Fer (Fe)", zn: "Zinc (Zn)", b: "Bore (B)",
+	    mn: "Manganèse (Mn)", cu: "Cuivre (Cu)", mo: "Molybdène (Mo)",
+	    nnh4: "Ammonium (N-NH₄)"
+	} %>
+
+	<% NutrientMeasurement::NUTRIENT_FIELDS.each do |field| %>
+	    <div class="col-6 col-md-3">
+		<div class="input-group">
+		    <%= form.number_field field,
+		     class: "form-control",
+		     placeholder: "—",
+		     step: "0.01",
+		     min: "0" %>
+		    <span class="input-group-text">mg/L</span>
+		</div>
+		<label class="form-label d-block small text-muted mt-1"><%= labels[field] %></label>
+	    </div>
+	<% end %>
+    </div>
+
+    <div>
+	<%= form.submit "Ajouter le relevé", class: "btn btn-primary" %>
+    </div>
+<% end %>
diff --git a/app/views/nutrient_measurements/index.html.erb b/app/views/nutrient_measurements/index.html.erb
new file mode 100644
index 0000000..c01d0cc
--- /dev/null
+++ b/app/views/nutrient_measurements/index.html.erb
@@ -0,0 +1,41 @@
+<% content_for :title, "Liste des Relevé" %>
+
+<h1 class="display-1">Liste des Relevés</h1>
+
+<div class="d-flex justify-content-between align-items-center mb-3">
+    <div class="btn-group">
+	<%= link_to "Nouvelle mesure", new_nutrient_measurement_path, class: "btn btn-primary" %>
+	<%= link_to "Retour", root_path, class: "btn btn-outline-secondary" %>
+    </div>
+</div>
+
+<div class="table-responsive">
+    <table class="table table-sm table-striped table-hover align-middle table-nutrient mb-0">
+	<thead class="table-light">
+	    <tr>
+		<th>Date</th>
+		<th class="text-end" title="Total N = NO₃-N + NH₄-N">N (total)</th>
+		<th class="text-end">P</th>
+		<th class="text-end">K</th>
+		<th class="text-end" title="Ammonia nitrogen">NH₄-N</th>
+	    </tr>
+	</thead>
+	<tbody>
+	    <% @nutrient_measurements.each do |m| %>
+		<tr>
+		    <td><%= l(m.measured_on) %></td>
+		    <td class="text-end">
+			<%= number_with_precision(m.nno3.to_f + m.nnh4.to_f, precision: 2) if m.nno3 || m.nnh4 %>
+		    </td>
+		    <td class="text-end"><%= number_with_precision(m.p, precision: 2) if m.p %></td>
+		    <td class="text-end"><%= number_with_precision(m.k, precision: 2) if m.k %></td>
+		    <td class="text-end"><%= number_with_precision(m.nnh4, precision: 2) if m.nnh4 %></td>
+		</tr>
+	    <% end %>
+	</tbody>
+    </table>
+</div>
+
+<%= line_chart @npk_measurement_data,
+               title: "NPK",
+               ytitle: "Concentration (mg/L)" %>
diff --git a/app/views/nutrient_measurements/new.html.erb b/app/views/nutrient_measurements/new.html.erb
new file mode 100644
index 0000000..82a913e
--- /dev/null
+++ b/app/views/nutrient_measurements/new.html.erb
@@ -0,0 +1,11 @@
+<% content_for :title, "Ajouter un Relevé" %>
+
+<h1 class="display-1">Ajouter un Relevé</h1>
+
+<%= render "form", nutrient_measurement: @nutrient_measurement %>
+
+<br>
+
+<div>
+    <%= link_to "Retour", root_path, class: "btn btn-secondary" %>
+</div>
diff --git a/app/views/targets/create.html.erb b/app/views/targets/create.html.erb
new file mode 100644
index 0000000..51e2782
--- /dev/null
+++ b/app/views/targets/create.html.erb
@@ -0,0 +1,2 @@
+<h1>Targets#create</h1>
+<p>Find me in app/views/targets/create.html.erb</p>
diff --git a/app/views/targets/edit.html.erb b/app/views/targets/edit.html.erb
new file mode 100644
index 0000000..849bf7f
--- /dev/null
+++ b/app/views/targets/edit.html.erb
@@ -0,0 +1,2 @@
+<h1>Targets#edit</h1>
+<p>Find me in app/views/targets/edit.html.erb</p>
diff --git a/app/views/targets/index.html.erb b/app/views/targets/index.html.erb
new file mode 100644
index 0000000..b552038
--- /dev/null
+++ b/app/views/targets/index.html.erb
@@ -0,0 +1,68 @@
+<h1 class="display-1">Cibles</h1>
+
+<div class="btn-group my-3">
+    <%= link_to "Nouvelle Cible", new_target_path, class: "btn btn-primary" %>
+</div>
+
+<div class="table-responsive">
+    <table class="table table-sm table-striped table-hover align-middle mb-0">
+	<thead class="table-light">
+	    <tr>
+		<th>Nom</th>
+		<th>Répartition</tr>
+		<th class="text-end" style="width: 140px;">Total %</th>
+		<th class="text-nowrap" style="width: 190px;">Créé le</th>
+		<th class="text-end" style="width: 180px;">Actions</th>
+	    </tr>
+	</thead>
+	<tbody>
+	    <% if @targets.present? %>
+		<% @targets.each do |t| %>
+		    <% sum_pct = t.target_allocations.sum { |a| a.percentage.to_f } %>
+		    <% badge_class = (sum_pct - 100.0).abs <= 0.01 ? "bg-success" : "bg-danger" %>
+		    <tr>
+			<td class="fw-semibold">
+			    <%= link_to t.name.presence || "Objectif ##{t.id}", t %>
+			</td>
+			<td>
+			    <% if t.target_allocations.empty? %>
+				<span class="text-muted">Aucune répartition définie</span>
+			    <% else %>
+				<ul class="list-unstyled mb-0 d-flex flex-wrap gap-2">
+				    <% t.target_allocations.each do |a| %>
+					<li class="badge text-bg-light border">
+					    <%= a.nutrient_profile&.name || "Profil ##{a.nutrient_profile_id}" %>
+					    — <%= number_with_precision(a.percentage.to_f, precision: 2) %>%
+					</li>
+				    <% end %>
+				</ul>
+			    <% end %>
+			</td>
+			<td class="text-end">
+			    <span class="badge <%= badge_class %>">
+				<%= number_with_precision(sum_pct, precision: 2) %>%
+			    </span>
+			</td>
+			<td class="text-nowrap">
+			    <%= l(t.created_at, format: :short) %>
+			</td>
+			<td class="text-end text-nowrap">
+			    <%= link_to "Voir", t, class: "btn btn-outline-secondary btn-sm" %>
+			    <%= link_to "Modifier", edit_target_path(t), class: "btn btn-outline-primary btn-sm" %>
+			    <%# FIXME: Doesn't work. %>
+			    <%= link_to "Supprimer", t, class: "btn btn-outline-danger btn-sm",
+					data: { turbo_method: :delete, turbo_confirm: "Supprimer cet objectif ?" } %>
+			</td>
+		    </tr>
+		<% end %>
+	    <% else %>
+		<tr>
+		    <td colspan="5" class="text-center py-4 text-muted">
+			Aucun objectif pour le moment.&nbsp;
+			<%= link_to "Créer le premier", new_target_path %>.
+		    </td>
+		</tr>
+	    <% end %>
+	</tbody>
+    </table>
+</div>
diff --git a/app/views/targets/new.html.erb b/app/views/targets/new.html.erb
new file mode 100644
index 0000000..42cb7bd
--- /dev/null
+++ b/app/views/targets/new.html.erb
@@ -0,0 +1,85 @@
+<% content_for :title, "Ajouter une Cible" %>
+
+<h1 class="display-1">Ajouter une Cible</h1>
+
+<%= form_with(model: @target) do |f| %>
+    <div class="card shadow-sm">
+	<div class="card-header">
+		<%= f.text_field :name, class: "form-control", placeholder: "Nom de la cible" %>
+	</div>
+
+	<div class="card-body p-0">
+	    <div class="table-responsive">
+		<table class="table table-hover align-middle mb-0">
+		    <thead class="table-light">
+			<tr>
+			    <th>Profil</th>
+			    <th class="text-end" style="width: 180px;">Proportion</th>
+			</tr>
+		    </thead>
+		    <tbody id="alloc-table-body">
+			<%= f.fields_for :target_allocations do |af| %>
+			    <% np = af.object.nutrient_profile %>
+			    <tr>
+				<td>
+				    <%= af.hidden_field :nutrient_profile_id %>
+				    <strong><%= np&.name.capitalize || "Profil ##{af.object.nutrient_profile_id}" %></strong>
+				</td>
+				<td class="text-end">
+				    <div class="input-group input-group-sm" style="max-width: 160px; margin-left:auto;">
+					<%= af.number_field :percentage,
+					   in: 0..100, step: 0.5,
+					   class: "form-control text-end alloc-input",
+					   placeholder: "0.0",
+					   data: { action: "input->alloc#sum" } %>
+					<span class="input-group-text">%</span>
+				    </div>
+				</td>
+			    </tr>
+			<% end %>
+		    </tbody>
+		    <tfoot>
+			<tr>
+			    <td class="small text-muted">Ajustez chaque pourcentage pour totaliser 100%.</td>
+			    <td class="text-end">
+				<span class="badge bg-secondary" id="alloc-total">Total : 0%</span>
+			    </td>
+			</tr>
+		    </tfoot>
+		</table>
+	    </div>
+	</div>
+
+	<div class="card-footer d-flex gap-2 justify-content-end">
+	    <div class="btn-group">
+		<%= f.submit "Enregistrer l’objectif", class: "btn btn-primary", id: "submit-btn" %>
+		<%= link_to "Annuler", targets_path, class: "btn btn-secondary" %>
+	    </div>
+	</div>
+    </div>
+<% end %>
+
+<script>
+ // Lightweight client-side sum check (no Stimulus required).
+ document.addEventListener("turbo:load", initAllocSum);
+ document.addEventListener("DOMContentLoaded", initAllocSum);
+
+ function initAllocSum() {
+     const inputs = document.querySelectorAll(".alloc-input");
+     const totalBadge = document.getElementById("alloc-total");
+     const submitBtn = document.getElementById("submit-btn");
+     if (!inputs.length || !totalBadge) return;
+
+     function updateTotal() {
+	 let sum = 0;
+	 inputs.forEach(i => sum += parseFloat(i.value || "0"));
+	 const rounded = Math.round(sum * 100) / 100;
+	 totalBadge.textContent = `Total : ${rounded}%`;
+	 totalBadge.className = "badge " + (Math.abs(rounded - 100) < 0.01 ? "bg-success" : "bg-danger");
+	 if (submitBtn) submitBtn.disabled = !(Math.abs(rounded - 100) < 0.01);
+     }
+
+     inputs.forEach(i => i.addEventListener("input", updateTotal));
+     updateTotal();
+ }
+</script>
diff --git a/app/views/targets/show.html.erb b/app/views/targets/show.html.erb
new file mode 100644
index 0000000..1525609
--- /dev/null
+++ b/app/views/targets/show.html.erb
@@ -0,0 +1,3 @@
+<h1>Targets#show</h1>
+
+<%# TODO: add table comparing this target with the most recent measurement. %>
diff --git a/app/views/targets/update.html.erb b/app/views/targets/update.html.erb
new file mode 100644
index 0000000..a39287c
--- /dev/null
+++ b/app/views/targets/update.html.erb
@@ -0,0 +1,2 @@
+<h1>Targets#update</h1>
+<p>Find me in app/views/targets/update.html.erb</p>
diff --git a/config/routes.rb b/config/routes.rb
index 50950d4..d5cbeaf 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -13,6 +13,7 @@ Rails.application.routes.draw do
   # end
 
   # resources :fertilizer_products
+  resources :targets
   resources :nutrient_profiles
   resources :nutrient_measurements
 
diff --git a/db/migrate/20250908181137_create_targets.rb b/db/migrate/20250908181137_create_targets.rb
new file mode 100644
index 0000000..9144e50
--- /dev/null
+++ b/db/migrate/20250908181137_create_targets.rb
@@ -0,0 +1,9 @@
+class CreateTargets < ActiveRecord::Migration[8.0]
+  def change
+    create_table :targets do |t|
+      t.string :name
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20250908181147_create_target_allocations.rb b/db/migrate/20250908181147_create_target_allocations.rb
new file mode 100644
index 0000000..9141bd3
--- /dev/null
+++ b/db/migrate/20250908181147_create_target_allocations.rb
@@ -0,0 +1,11 @@
+class CreateTargetAllocations < ActiveRecord::Migration[8.0]
+  def change
+    create_table :target_allocations do |t|
+      t.references :target, null: false, foreign_key: true
+      t.references :nutrient_profile, null: false, foreign_key: true
+      t.decimal :percentage
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index feb2fd0..d201f5a 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_09_01_112954) do
+ActiveRecord::Schema[8.0].define(version: 2025_09_08_181147) do
   create_table "beds", force: :cascade do |t|
     t.integer "location", null: false
     t.datetime "created_at", null: false
@@ -122,8 +122,26 @@ ActiveRecord::Schema[8.0].define(version: 2025_09_01_112954) do
     t.index ["crop_nutrient_need_id"], name: "index_rafts_on_crop_nutrient_need_id"
   end
 
+  create_table "target_allocations", force: :cascade do |t|
+    t.integer "target_id", null: false
+    t.integer "nutrient_profile_id", null: false
+    t.decimal "percentage"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["nutrient_profile_id"], name: "index_target_allocations_on_nutrient_profile_id"
+    t.index ["target_id"], name: "index_target_allocations_on_target_id"
+  end
+
+  create_table "targets", force: :cascade do |t|
+    t.string "name"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   add_foreign_key "fertilizer_compositions", "fertilizer_components"
   add_foreign_key "fertilizer_compositions", "fertilizer_products"
   add_foreign_key "rafts", "beds"
   add_foreign_key "rafts", "nutrient_profiles", column: "crop_nutrient_need_id"
+  add_foreign_key "target_allocations", "nutrient_profiles"
+  add_foreign_key "target_allocations", "targets"
 end
diff --git a/db/seeds/NutrientProfile.rb b/db/seeds/NutrientProfile.rb
index 04e16cc..0c3c152 100644
--- a/db/seeds/NutrientProfile.rb
+++ b/db/seeds/NutrientProfile.rb
@@ -101,7 +101,7 @@
     b: 0.11,
     mn: 0.11,
     cu: 0.03,
-    mo: 0.01 },
+    mo: 0.01 }
 ].each do |profile|
   NutrientProfile.find_or_create_by!(name: profile[:name]) do |p|
     p.attributes = profile
diff --git a/test/controllers/targets_controller_test.rb b/test/controllers/targets_controller_test.rb
new file mode 100644
index 0000000..911e3ae
--- /dev/null
+++ b/test/controllers/targets_controller_test.rb
@@ -0,0 +1,33 @@
+require "test_helper"
+
+class TargetsControllerTest < ActionDispatch::IntegrationTest
+  test "should get index" do
+    get targets_index_url
+    assert_response :success
+  end
+
+  test "should get new" do
+    get targets_new_url
+    assert_response :success
+  end
+
+  test "should get create" do
+    get targets_create_url
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get targets_edit_url
+    assert_response :success
+  end
+
+  test "should get update" do
+    get targets_update_url
+    assert_response :success
+  end
+
+  test "should get show" do
+    get targets_show_url
+    assert_response :success
+  end
+end
diff --git a/test/fixtures/target_allocations.yml b/test/fixtures/target_allocations.yml
new file mode 100644
index 0000000..0ba49ee
--- /dev/null
+++ b/test/fixtures/target_allocations.yml
@@ -0,0 +1,11 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  target: one
+  nutrient_profile: one
+  percentage: 9.99
+
+two:
+  target: two
+  nutrient_profile: two
+  percentage: 9.99
diff --git a/test/fixtures/targets.yml b/test/fixtures/targets.yml
new file mode 100644
index 0000000..7d41224
--- /dev/null
+++ b/test/fixtures/targets.yml
@@ -0,0 +1,7 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString
diff --git a/test/models/target_allocation_test.rb b/test/models/target_allocation_test.rb
new file mode 100644
index 0000000..a89cd89
--- /dev/null
+++ b/test/models/target_allocation_test.rb
@@ -0,0 +1,7 @@
+require "test_helper"
+
+class TargetAllocationTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end
diff --git a/test/models/target_test.rb b/test/models/target_test.rb
new file mode 100644
index 0000000..1d9b332
--- /dev/null
+++ b/test/models/target_test.rb
@@ -0,0 +1,7 @@
+require "test_helper"
+
+class TargetTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end