-- Migration: 0041_route_optimization.sql
-- Route optimization schema: geocoding columns on clients, groomerRoutes +
-- routeStops tables, and route settings on business_settings.
-- Written idempotently so it is safe to re-run.

-- ─── Enums ────────────────────────────────────────────────────────────────────

DO $$ BEGIN
  CREATE TYPE "route_status" AS ENUM ('draft', 'optimized', 'in_progress', 'completed');
EXCEPTION WHEN duplicate_object THEN NULL;
END $$;

-- ─── Clients: geocoding columns ───────────────────────────────────────────────

ALTER TABLE "clients" ADD COLUMN IF NOT EXISTS "latitude" double precision;
ALTER TABLE "clients" ADD COLUMN IF NOT EXISTS "longitude" double precision;
ALTER TABLE "clients" ADD COLUMN IF NOT EXISTS "geocoded_at" timestamp;

-- ─── Business settings: route optimization config ─────────────────────────────

ALTER TABLE "business_settings"
  ADD COLUMN IF NOT EXISTS "default_travel_buffer_mins" integer NOT NULL DEFAULT 15;
ALTER TABLE "business_settings"
  ADD COLUMN IF NOT EXISTS "route_optimization_provider" text DEFAULT 'nominatim';
-- Encrypted at rest at the application layer (AES-256-GCM).
ALTER TABLE "business_settings"
  ADD COLUMN IF NOT EXISTS "google_maps_api_key" text;

-- ─── Groomer routes table ─────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS "groomer_routes" (
  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  "staff_id" uuid NOT NULL REFERENCES "staff"("id") ON DELETE CASCADE,
  "route_date" date NOT NULL,
  "status" "route_status" NOT NULL DEFAULT 'draft',
  "total_travel_mins" integer,
  "total_distance_km" numeric(8, 2),
  "optimized_at" timestamp,
  "created_at" timestamp NOT NULL DEFAULT now(),
  "updated_at" timestamp NOT NULL DEFAULT now(),
  CONSTRAINT "uq_groomer_routes_staff_date" UNIQUE ("staff_id", "route_date")
);

CREATE INDEX IF NOT EXISTS "idx_groomer_routes_staff_id"
  ON "groomer_routes"("staff_id");

-- ─── Route stops table ────────────────────────────────────────────────────────

CREATE TABLE IF NOT EXISTS "route_stops" (
  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  "route_id" uuid NOT NULL REFERENCES "groomer_routes"("id") ON DELETE CASCADE,
  "appointment_id" uuid NOT NULL REFERENCES "appointments"("id") ON DELETE CASCADE,
  "stop_order" integer NOT NULL,
  "latitude" double precision NOT NULL,
  "longitude" double precision NOT NULL,
  "travel_mins_from_prev" integer,
  "travel_distance_km_from_prev" numeric(8, 2),
  "buffer_mins" integer NOT NULL DEFAULT 15,
  "created_at" timestamp NOT NULL DEFAULT now(),
  "updated_at" timestamp NOT NULL DEFAULT now(),
  CONSTRAINT "uq_route_stops_route_appointment" UNIQUE ("route_id", "appointment_id"),
  CONSTRAINT "uq_route_stops_route_order" UNIQUE ("route_id", "stop_order")
);

CREATE INDEX IF NOT EXISTS "idx_route_stops_route_id"
  ON "route_stops"("route_id");