Add query and controller endpoint for usage data (#102)

packages/Manager/src/main/kotlin/nz/govt/eop/plan_limits/Controller.kt

@@ -1,14 +1,18 @@
 package nz.govt.eop.plan_limits
 
+import java.time.LocalDate
+import java.time.temporal.ChronoUnit.DAYS
 import java.util.concurrent.TimeUnit
 import org.jooq.*
 import org.springframework.http.CacheControl
+import org.springframework.http.HttpStatus
 import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.stereotype.Controller
 import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RequestParam
 import org.springframework.web.bind.annotation.ResponseBody
+import org.springframework.web.server.ResponseStatusException
 
 @Controller
 class Controller(val context: DSLContext, val queries: Queries, val manifest: Manifest) {
@@ -79,4 +83,28 @@ class Controller(val context: DSLContext, val queries: Queries, val manifest: Ma
         .cacheControl(CacheControl.maxAge(365, TimeUnit.DAYS))
         .body(queries.flowLimits(councilId))
   }
+
+  @RequestMapping("/plan-limits/weekly-usage", produces = [MediaType.APPLICATION_JSON_VALUE])
+  @ResponseBody
+  fun weeklyUsage(
+      @RequestParam(name = "councilId") councilId: Int,
+      @RequestParam("from") from: LocalDate,
+      @RequestParam("to") to: LocalDate,
+      @RequestParam("areaId") areaId: String?
+  ): ResponseEntity<String> {
+    if (from >= to) {
+      throw ResponseStatusException(
+          HttpStatus.BAD_REQUEST, "The parameter \"to\" must be after \"from\"")
+    }
+    val difference = DAYS.between(from, to)
+    if (difference < 1 || difference >= 366) {
+      throw ResponseStatusException(
+          HttpStatus.BAD_REQUEST,
+          "The duration between \"from\" and \"to\" should be more than one day and at most one year")
+    }
+
+    return ResponseEntity.ok()
+        .cacheControl(CacheControl.maxAge(365, TimeUnit.DAYS))
+        .body(queries.weeklyUsage(councilId, from, to, areaId))
+  }
 }

packages/Manager/src/main/kotlin/nz/govt/eop/plan_limits/Queries.kt

@@ -1,5 +1,6 @@
 package nz.govt.eop.plan_limits
 
+import java.time.LocalDate
 import nz.govt.eop.si.jooq.tables.Councils.Companion.COUNCILS
 import nz.govt.eop.si.jooq.tables.FlowLimits.Companion.FLOW_LIMITS
 import nz.govt.eop.si.jooq.tables.FlowMeasurementSites.Companion.FLOW_MEASUREMENT_SITES
@@ -8,8 +9,10 @@ import nz.govt.eop.si.jooq.tables.GroundwaterLimits.Companion.GROUNDWATER_LIMITS
 import nz.govt.eop.si.jooq.tables.PlanRegions.Companion.PLAN_REGIONS
 import nz.govt.eop.si.jooq.tables.Plans.Companion.PLANS
 import nz.govt.eop.si.jooq.tables.SurfaceWaterLimits.Companion.SURFACE_WATER_LIMITS
+import nz.govt.eop.si.jooq.tables.WaterAllocationAndUsageByArea.Companion.WATER_ALLOCATION_AND_USAGE_BY_AREA
 import nz.govt.eop.si.jooq.tables.WaterAllocationsByArea.Companion.WATER_ALLOCATIONS_BY_AREA
 import org.jooq.*
+import org.jooq.impl.DSL
 import org.jooq.impl.DSL.*
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Component
@@ -152,6 +155,34 @@ class Queries(@Autowired val context: DSLContext) {
     return buildFeatureCollection(context, innerQuery)
   }
 
+  fun weeklyUsage(councilId: Int, from: LocalDate, to: LocalDate, areaId: String? = null): String {
+    var whereCondition = DSL.noCondition()
+    if (areaId != null) {
+      whereCondition = whereCondition.and(WATER_ALLOCATION_AND_USAGE_BY_AREA.AREA_ID.eq(areaId))
+    }
+
+    val innerQuery =
+        select(
+                WATER_ALLOCATION_AND_USAGE_BY_AREA.AREA_ID,
+                sum(WATER_ALLOCATION_AND_USAGE_BY_AREA.ALLOCATION).`as`("total_allocation"),
+                sum(WATER_ALLOCATION_AND_USAGE_BY_AREA.ALLOCATION_DAILY)
+                    .`as`("metered_daily_allocation"),
+                sum(WATER_ALLOCATION_AND_USAGE_BY_AREA.METERED_ALLOCATION_YEARLY)
+                    .`as`("metered_yearly_allocation"),
+                sum(WATER_ALLOCATION_AND_USAGE_BY_AREA.DAILY_USAGE).`as`("daily_usage"))
+            .from(WATER_ALLOCATION_AND_USAGE_BY_AREA)
+            .where(whereCondition)
+            .and(WATER_ALLOCATION_AND_USAGE_BY_AREA.DATE.ge(from))
+            .and(WATER_ALLOCATION_AND_USAGE_BY_AREA.DATE.le(to))
+            .groupBy(WATER_ALLOCATION_AND_USAGE_BY_AREA.AREA_ID)
+
+    val featureCollection: Field<JSONB> =
+        coalesce(function("json_agg", JSONB::class.java, field("inputs")), jsonArray())
+
+    val result = context.select(featureCollection).from(innerQuery.asTable("inputs")).fetch()
+    return result.firstNotNullOf { it.value1().toString() }
+  }
+
   private fun <R : Record> buildFeatureCollection(
       dslContext: DSLContext,
       innerQuery: Select<R>