[Feat] Coupon system

WIP. Idea for solving #57

apps/api/src/services/billing/credit_billing.ts

@@ -41,14 +41,30 @@ export async function supaBillTeam(team_id: string, credits: number) {
     return { success: true, credit_usage };
   }
 
-  // 2. add the credits to the credits_usage
+  // 2. Check for available coupons
+  const { data: coupons } = await supabase_service
+    .from("coupons")
+    .select("credits")
+    .eq("team_id", team_id)
+    .eq("status", "active");
+
+  let couponValue = 0;
+  if (coupons && coupons.length > 0) {
+    couponValue = coupons[0].credits; // Assuming only one active coupon can be used at a time
+    console.log(`Applying coupon of ${couponValue} credits`);
+  }
+
+  // Calculate final credits used after applying coupon
+  const finalCreditsUsed = Math.max(0, credits - couponValue);
+
+  // 3. Log the credit usage
   const { data: credit_usage } = await supabase_service
     .from("credit_usage")
     .insert([
       {
         team_id,
-        subscription_id: subscription.id,
-        credits_used: credits,
+        subscription_id: subscription ? subscription.id : null,
+        credits_used: finalCreditsUsed,
         created_at: new Date(),
       },
     ])
@@ -65,9 +81,9 @@ export async function supaCheckTeamCredits(team_id: string, credits: number) {
   if (team_id === "preview") {
     return { success: true, message: "Preview team, no credits used" };
   }
-  // 1. Retrieve the team's active subscription based on the team_id.
-  const { data: subscription, error: subscriptionError } =
-    await supabase_service
+
+  // Retrieve the team's active subscription
+  const { data: subscription, error: subscriptionError } = await supabase_service
     .from("subscriptions")
     .select("id, price_id, current_period_start, current_period_end")
     .eq("team_id", team_id)
@@ -75,51 +91,22 @@ export async function supaCheckTeamCredits(team_id: string, credits: number) {
     .single();
 
   if (subscriptionError || !subscription) {
-    const { data: creditUsages, error: creditUsageError } =
-      await supabase_service
-        .from("credit_usage")
-        .select("credits_used")
-        .is("subscription_id", null)
-        .eq("team_id", team_id);
-    // .gte("created_at", subscription.current_period_start)
-    // .lte("created_at", subscription.current_period_end);
-
-    if (creditUsageError) {
-      throw new Error(
-        `Failed to retrieve credit usage for subscription_id: ${subscription.id}`
-      );
+    return { success: false, message: "No active subscription found" };
   }
 
-    const totalCreditsUsed = creditUsages.reduce(
-      (acc, usage) => acc + usage.credits_used,
-      0
-    );
-
-    console.log("totalCreditsUsed", totalCreditsUsed);
-    // 5. Compare the total credits used with the credits allowed by the plan.
-    if (totalCreditsUsed + credits > FREE_CREDITS) {
-      return {
-        success: false,
-        message: "Insufficient credits, please upgrade!",
-      };
-    }
-    return { success: true, message: "Sufficient credits available" };
-  }
-
-  // 2. Get the price_id from the subscription.
-  const { data: price, error: priceError } = await supabase_service
-    .from("prices")
+  // Check for available coupons
+  const { data: coupons } = await supabase_service
+    .from("coupons")
     .select("credits")
-    .eq("id", subscription.price_id)
-    .single();
+    .eq("team_id", team_id)
+    .eq("status", "active");
 
-  if (priceError) {
-    throw new Error(
-      `Failed to retrieve price for price_id: ${subscription.price_id}`
-    );
+  let couponValue = 0;
+  if (coupons && coupons.length > 0) {
+    couponValue = coupons[0].credits;
   }
 
-  // 4. Calculate the total credits used by the team within the current billing period.
+  // Calculate the total credits used by the team within the current billing period
   const { data: creditUsages, error: creditUsageError } = await supabase_service
     .from("credit_usage")
     .select("credits_used")
@@ -128,18 +115,27 @@ export async function supaCheckTeamCredits(team_id: string, credits: number) {
     .lte("created_at", subscription.current_period_end);
 
   if (creditUsageError) {
-    throw new Error(
-      `Failed to retrieve credit usage for subscription_id: ${subscription.id}`
-    );
+    throw new Error(`Failed to retrieve credit usage for subscription_id: ${subscription.id}`);
   }
 
-  const totalCreditsUsed = creditUsages.reduce(
-    (acc, usage) => acc + usage.credits_used,
-    0
-  );
+  const totalCreditsUsed = creditUsages.reduce((acc, usage) => acc + usage.credits_used, 0);
 
-  // 5. Compare the total credits used with the credits allowed by the plan.
-  if (totalCreditsUsed + credits > price.credits) {
+  // Adjust total credits used by subtracting coupon value
+  const adjustedCreditsUsed = Math.max(0, totalCreditsUsed - couponValue);
+
+  // Get the price details
+  const { data: price, error: priceError } = await supabase_service
+    .from("prices")
+    .select("credits")
+    .eq("id", subscription.price_id)
+    .single();
+
+  if (priceError) {
+    throw new Error(`Failed to retrieve price for price_id: ${subscription.price_id}`);
+  }
+
+  // Compare the adjusted total credits used with the credits allowed by the plan
+  if (adjustedCreditsUsed + credits > price.credits) {
     return { success: false, message: "Insufficient credits, please upgrade!" };
   }
 
@@ -159,7 +155,17 @@ export async function countCreditsAndRemainingForCurrentBillingPeriod(
       .single();
 
   if (subscriptionError || !subscription) {
-    // throw new Error(`Failed to retrieve subscription for team_id: ${team_id}`);
+    // Check for available coupons even if there's no subscription
+    const { data: coupons } = await supabase_service
+      .from("coupons")
+      .select("value")
+      .eq("team_id", team_id)
+      .eq("status", "active");
+
+    let couponValue = 0;
+    if (coupons && coupons.length > 0) {
+      couponValue = coupons[0].value;
+    }
 
     // Free
     const { data: creditUsages, error: creditUsageError } =
@@ -168,13 +174,9 @@ export async function countCreditsAndRemainingForCurrentBillingPeriod(
         .select("credits_used")
         .is("subscription_id", null)
         .eq("team_id", team_id);
-    // .gte("created_at", subscription.current_period_start)
-    // .lte("created_at", subscription.current_period_end);
 
     if (creditUsageError || !creditUsages) {
-      throw new Error(
-        `Failed to retrieve credit usage for subscription_id: ${subscription.id}`
-      );
+      throw new Error(`Failed to retrieve credit usage for team_id: ${team_id}`);
     }
 
     const totalCreditsUsed = creditUsages.reduce(
@@ -182,26 +184,27 @@ export async function countCreditsAndRemainingForCurrentBillingPeriod(
       0
     );
 
+    // Adjust total credits used by subtracting coupon value
+    const adjustedCreditsUsed = Math.max(0, totalCreditsUsed - couponValue);
+
     // 4. Calculate remaining credits.
-    const remainingCredits = FREE_CREDITS - totalCreditsUsed;
+    const remainingCredits = FREE_CREDITS - adjustedCreditsUsed;
 
-    return { totalCreditsUsed, remainingCredits, totalCredits: FREE_CREDITS };
+    return { totalCreditsUsed: adjustedCreditsUsed, remainingCredits, totalCredits: FREE_CREDITS };
   }
 
-  // 2. Get the price_id from the subscription to retrieve the total credits available.
-  const { data: price, error: priceError } = await supabase_service
-    .from("prices")
+  // If there is an active subscription
+  const { data: coupons } = await supabase_service
+  .from("coupons")
   .select("credits")
-    .eq("id", subscription.price_id)
-    .single();
+  .eq("team_id", team_id)
+  .eq("status", "active");
 
-  if (priceError || !price) {
-    throw new Error(
-      `Failed to retrieve price for price_id: ${subscription.price_id}`
-    );
+  let couponValue = 0;
+  if (coupons && coupons.length > 0) {
+  couponValue = coupons[0].credits;
   }
 
-  // 3. Calculate the total credits used by the team within the current billing period.
   const { data: creditUsages, error: creditUsageError } = await supabase_service
   .from("credit_usage")
   .select("credits_used")
@@ -210,9 +213,7 @@ export async function countCreditsAndRemainingForCurrentBillingPeriod(
   .lte("created_at", subscription.current_period_end);
 
   if (creditUsageError || !creditUsages) {
-    throw new Error(
-      `Failed to retrieve credit usage for subscription_id: ${subscription.id}`
-    );
+  throw new Error(`Failed to retrieve credit usage for subscription_id: ${subscription.id}`);
   }
 
   const totalCreditsUsed = creditUsages.reduce(
@@ -220,8 +221,25 @@ export async function countCreditsAndRemainingForCurrentBillingPeriod(
   0
   );
 
-  // 4. Calculate remaining credits.
-  const remainingCredits = price.credits - totalCreditsUsed;
+  // Adjust total credits used by subtracting coupon value
+  const adjustedCreditsUsed = Math.max(0, totalCreditsUsed - couponValue);
 
-  return { totalCreditsUsed, remainingCredits, totalCredits: price.credits };
+  const { data: price, error: priceError } = await supabase_service
+  .from("prices")
+  .select("credits")
+  .eq("id", subscription.price_id)
+  .single();
+
+  if (priceError || !price) {
+  throw new Error(`Failed to retrieve price for price_id: ${subscription.price_id}`);
+  }
+
+  // Calculate remaining credits.
+  const remainingCredits = price.credits - adjustedCreditsUsed;
+
+  return {
+  totalCreditsUsed: adjustedCreditsUsed,
+  remainingCredits,
+  totalCredits: price.credits
+  };
   }