-- Signal Phase 2 Schema
-- Run this in the Supabase SQL editor (Dashboard > SQL Editor > New query)
-- Safe to run multiple times — uses IF NOT EXISTS throughout

create extension if not exists "uuid-ossp";

-- Organizations (DME supplier accounts)
create table if not exists organizations (
  id          uuid        primary key default uuid_generate_v4(),
  name        text        not null,
  slug        text        unique not null,
  created_at  timestamptz not null default now(),
  updated_at  timestamptz not null default now()
);

-- Users (staff at each org)
create table if not exists users (
  id          uuid        primary key default uuid_generate_v4(),
  org_id      uuid        not null references organizations(id) on delete cascade,
  email       text        not null unique,
  role        text        not null default 'staff',  -- 'admin' | 'staff'
  created_at  timestamptz not null default now(),
  updated_at  timestamptz not null default now()
);

-- Upload batches (one per CSV upload event)
create table if not exists upload_batches (
  id            uuid        primary key default uuid_generate_v4(),
  org_id        uuid        not null references organizations(id) on delete cascade,
  uploaded_by   uuid        references users(id),
  filename      text        not null,
  row_count     int         not null default 0,
  skipped_count int         not null default 0,
  status        text        not null default 'processing',  -- 'processing' | 'complete' | 'failed'
  created_at    timestamptz not null default now()
);

-- Source files (raw CSV metadata, WORM)
create table if not exists source_files (
  id            uuid        primary key default uuid_generate_v4(),
  batch_id      uuid        not null references upload_batches(id) on delete cascade,
  filename      text        not null,
  content_hash  text        not null,  -- SHA-256 of file bytes
  byte_size     int         not null,
  created_at    timestamptz not null default now()
);

-- Raw rows (original CSV row data before normalization, WORM)
create table if not exists raw_rows (
  id          uuid        primary key default uuid_generate_v4(),
  batch_id    uuid        not null references upload_batches(id) on delete cascade,
  row_number  int         not null,
  raw_data    jsonb       not null,  -- original column key/value pairs
  created_at  timestamptz not null default now()
);

-- Normalized records (scored output)
create table if not exists normalized_records (
  id                  uuid        primary key default uuid_generate_v4(),
  batch_id            uuid        not null references upload_batches(id) on delete cascade,
  patient_id_hash     text        not null,  -- SHA-256 of patient_id — no raw PHI stored
  device_type         text        not null,
  shipment_date       date        not null,
  quantity            int         not null default 1,
  payer               text        not null,
  component           text        not null default 'sensor',
  coverage_status     text        not null,  -- OUT_OF_COVERAGE | VISIT_DUE | REFILL_WINDOW | OK
  days_remaining      int,
  reason              text,
  recommended_action  text,
  rule_version        text        not null,
  created_at          timestamptz not null default now()
);

-- Mapping decisions (header-to-field mapping log per batch)
create table if not exists mapping_decisions (
  id              uuid        primary key default uuid_generate_v4(),
  batch_id        uuid        not null references upload_batches(id) on delete cascade,
  raw_header      text        not null,
  canonical_field text,
  confidence      text        not null,  -- 'high' | 'inferred' | 'unmapped'
  created_at      timestamptz not null default now()
);

-- Report runs (one per scored batch delivered to user)
create table if not exists report_runs (
  id             uuid        primary key default uuid_generate_v4(),
  batch_id       uuid        not null references upload_batches(id) on delete cascade,
  org_id         uuid        not null references organizations(id) on delete cascade,
  generated_by   uuid        references users(id),
  status         text        not null default 'complete',
  total_records  int         not null default 0,
  flagged_count  int         not null default 0,
  created_at     timestamptz not null default now()
);

-- Report items (one row per patient record in the worklist)
create table if not exists report_items (
  id                    uuid        primary key default uuid_generate_v4(),
  report_run_id         uuid        not null references report_runs(id) on delete cascade,
  normalized_record_id  uuid        not null references normalized_records(id),
  patient_id_hash       text        not null,
  status                text        not null,
  days_remaining        int,
  reason                text,
  recommended_action    text,
  created_at            timestamptz not null default now()
);

-- Export files (downloaded work queue CSVs)
create table if not exists export_files (
  id             uuid        primary key default uuid_generate_v4(),
  report_run_id  uuid        not null references report_runs(id) on delete cascade,
  exported_by    uuid        references users(id),
  filename       text        not null,
  row_count      int         not null default 0,
  created_at     timestamptz not null default now()
);

-- Audit events (WORM — append only, never update or delete)
create table if not exists audit_events (
  id             uuid        primary key default uuid_generate_v4(),
  org_id         uuid        references organizations(id),
  user_id        uuid        references users(id),
  action         text        not null,  -- 'upload' | 'export' | 'login' | 'view_report'
  resource_type  text,
  resource_id    uuid,
  patient_id_hash text,
  metadata       jsonb,
  ip_address     text,
  created_at     timestamptz not null default now()
);

-- Enable Row Level Security on all tables
alter table organizations       enable row level security;
alter table users               enable row level security;
alter table upload_batches      enable row level security;
alter table source_files        enable row level security;
alter table raw_rows            enable row level security;
alter table normalized_records  enable row level security;
alter table mapping_decisions   enable row level security;
alter table report_runs         enable row level security;
alter table report_items        enable row level security;
alter table export_files        enable row level security;
alter table audit_events        enable row level security;

-- WORM rules: audit_events, raw_rows, source_files are append-only
do $$ begin
  if not exists (select 1 from pg_rules where rulename = 'audit_events_no_update') then
    create rule audit_events_no_update as on update to audit_events do instead nothing;
  end if;
  if not exists (select 1 from pg_rules where rulename = 'audit_events_no_delete') then
    create rule audit_events_no_delete as on delete to audit_events do instead nothing;
  end if;
  if not exists (select 1 from pg_rules where rulename = 'raw_rows_no_update') then
    create rule raw_rows_no_update as on update to raw_rows do instead nothing;
  end if;
  if not exists (select 1 from pg_rules where rulename = 'raw_rows_no_delete') then
    create rule raw_rows_no_delete as on delete to raw_rows do instead nothing;
  end if;
  if not exists (select 1 from pg_rules where rulename = 'source_files_no_update') then
    create rule source_files_no_update as on update to source_files do instead nothing;
  end if;
  if not exists (select 1 from pg_rules where rulename = 'source_files_no_delete') then
    create rule source_files_no_delete as on delete to source_files do instead nothing;
  end if;
end $$;

-- Confirmed visit dates (staff-entered, persists across CSV imports)
create table if not exists confirmed_visits (
  id              uuid        primary key default uuid_generate_v4(),
  org_id          uuid        not null references organizations(id) on delete cascade,
  patient_id_hash text        not null,
  confirmed_date  date        not null,
  confirmed_by    text,
  created_at      timestamptz not null default now(),
  updated_at      timestamptz not null default now(),
  unique(org_id, patient_id_hash)
);
create index if not exists idx_confirmed_visits_org  on confirmed_visits(org_id);
create index if not exists idx_confirmed_visits_hash on confirmed_visits(patient_id_hash);
alter table confirmed_visits enable row level security;

-- Indexes
create index if not exists idx_upload_batches_org        on upload_batches(org_id);
create index if not exists idx_normalized_records_batch  on normalized_records(batch_id);
create index if not exists idx_normalized_records_status on normalized_records(coverage_status);
create index if not exists idx_audit_events_org          on audit_events(org_id);
create index if not exists idx_audit_events_action       on audit_events(action);
create index if not exists idx_report_items_run          on report_items(report_run_id);
