-- ---------------------------------------------------------------------------
-- Núcleo de la plataforma. Nombres de tabla y columna en inglés a propósito:
-- son los que shared/types.ts y el frontend ya consumen.
-- ---------------------------------------------------------------------------

CREATE TABLE businesses (
  id              bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  name            text NOT NULL,
  industry        text NOT NULL DEFAULT 'Estética y Spa',
  currency        text NOT NULL DEFAULT 'MXN',
  currency_symbol text NOT NULL DEFAULT '$',
  phone           text,
  address         text,
  slug            text UNIQUE,
  timezone        text NOT NULL DEFAULT 'America/Mexico_City',
  working_hours   jsonb NOT NULL,
  status          text NOT NULL DEFAULT 'active',
  created_at      timestamptz NOT NULL DEFAULT now()
);

CREATE TABLE employees (
  id             bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id    bigint NOT NULL REFERENCES businesses(id) ON DELETE CASCADE,
  name           text NOT NULL,
  email          text,
  phone          text,
  color          text NOT NULL DEFAULT '#3b66ff',
  role           text NOT NULL DEFAULT 'specialist',
  active         boolean NOT NULL DEFAULT true,
  working_hours  jsonb,           -- NULL = hereda del negocio
  commission_pct numeric(5,2) NOT NULL DEFAULT 0,
  created_at     timestamptz NOT NULL DEFAULT now()
);

CREATE TABLE services (
  id             bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id    bigint NOT NULL REFERENCES businesses(id) ON DELETE CASCADE,
  name           text NOT NULL,
  description    text,
  category       text NOT NULL DEFAULT 'General',
  duration_min   integer NOT NULL DEFAULT 60,
  price          numeric(10,2) NOT NULL DEFAULT 0,
  color          text NOT NULL DEFAULT '#3b66ff',
  commission_pct numeric(5,2) NOT NULL DEFAULT 0,
  active         boolean NOT NULL DEFAULT true,
  created_at     timestamptz NOT NULL DEFAULT now()
);

CREATE TABLE employee_services (
  employee_id bigint NOT NULL REFERENCES employees(id) ON DELETE CASCADE,
  service_id  bigint NOT NULL REFERENCES services(id)  ON DELETE CASCADE,
  PRIMARY KEY (employee_id, service_id)
);

CREATE TABLE users (
  id           bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id  bigint REFERENCES businesses(id) ON DELETE CASCADE,
  email        text NOT NULL UNIQUE,
  password     text NOT NULL,
  name         text NOT NULL,
  role         text NOT NULL CHECK (role IN ('admin','owner','employee')),
  employee_id  bigint REFERENCES employees(id),
  avatar_color text NOT NULL DEFAULT '#3b66ff',
  created_at   timestamptz NOT NULL DEFAULT now()
);

-- La clienta. `phone_e164` es la clave de identidad: es lo único que puede
-- reconciliar el mismo número que llega por canales distintos, y el índice
-- parcial de abajo es lo que impide el duplicado.
CREATE TABLE clients (
  id             bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id    bigint NOT NULL REFERENCES businesses(id) ON DELETE CASCADE,
  name           text NOT NULL,
  email          text,
  phone          text,                    -- lo que tecleó la persona, tal cual
  phone_e164     text,                    -- lo normalizado; NULL si no se pudo
  contactable    boolean GENERATED ALWAYS AS (phone_e164 IS NOT NULL) STORED,
  birth_date     date,
  notes          text,
  tags           text,
  source_channel text,                    -- whatsapp|facebook|instagram|mostrador|referido
  -- Se declara desde el día uno aunque la Fase 2 aún no exista: es el ancla de
  -- correlación con Bucéfalo CRM, y añadirla después obliga a un backfill que
  -- no se puede hacer sin releer el CRM entero.
  crm_contact_id text,
  crm_synced_at  timestamptz,
  created_at     timestamptz NOT NULL DEFAULT now(),
  deleted_at     timestamptz              -- baja lógica: la clienta nunca se borra
);

-- Un mismo teléfono no puede repetirse dentro de un negocio. Es parcial porque
-- el 40.8 % del histórico medido no tiene teléfono y esas filas deben convivir.
CREATE UNIQUE INDEX clients_phone_unique
  ON clients (business_id, phone_e164)
  WHERE phone_e164 IS NOT NULL AND deleted_at IS NULL;

CREATE INDEX clients_business_name ON clients (business_id, name);

CREATE TABLE appointments (
  id                 bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id        bigint NOT NULL REFERENCES businesses(id) ON DELETE CASCADE,
  client_id          bigint NOT NULL REFERENCES clients(id),
  employee_id        bigint NOT NULL REFERENCES employees(id),
  service_id         bigint NOT NULL REFERENCES services(id),
  start_at           timestamptz NOT NULL,
  -- `end_at` se materializa, no se deriva: si mañana cambia la duración del
  -- servicio, las citas ya agendadas no deben moverse.
  end_at             timestamptz NOT NULL,
  during             tstzrange GENERATED ALWAYS AS (tstzrange(start_at, end_at, '[)')) STORED,
  status             text NOT NULL DEFAULT 'scheduled'
                     CHECK (status IN ('scheduled','completed','cancelled','no_show')),
  cancelled_by       text CHECK (cancelled_by IN ('client','business')),
  cancel_reason      text,
  price              numeric(10,2) NOT NULL DEFAULT 0,
  notes              text,
  source_channel     text,
  created_by_user_id bigint REFERENCES users(id),
  created_at         timestamptz NOT NULL DEFAULT now(),
  updated_at         timestamptz NOT NULL DEFAULT now(),
  CONSTRAINT appointments_end_after_start CHECK (end_at > start_at),
  CONSTRAINT appointments_cancelled_by_only_when_cancelled
    CHECK (cancelled_by IS NULL OR status = 'cancelled'),
  -- Aquí está la diferencia con el backend de SQLite: la doble reserva deja de
  -- ser una validación que alguien puede saltarse y pasa a ser el motor
  -- rechazando la fila. Las canceladas no reservan hueco.
  CONSTRAINT appointments_no_overlap EXCLUDE USING gist (
    employee_id WITH =,
    during      WITH &&
  ) WHERE (status <> 'cancelled')
);

CREATE INDEX appointments_business_start ON appointments (business_id, start_at);
CREATE INDEX appointments_employee_start ON appointments (employee_id, start_at);
CREATE INDEX appointments_client         ON appointments (client_id);

-- La visita es el hecho consumado, y está separada de la cita a propósito:
-- una cita es una intención. Fusionarlas es el error que dejó 3 002
-- oportunidades congeladas en el CRM — un registro que sirve para planear y
-- para cerrar termina sin cerrarse nunca.
CREATE TABLE visits (
  id                  bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id         bigint NOT NULL REFERENCES businesses(id) ON DELETE CASCADE,
  appointment_id      bigint UNIQUE REFERENCES appointments(id),
  client_id           bigint NOT NULL REFERENCES clients(id),
  employee_id         bigint NOT NULL REFERENCES employees(id),
  occurred_at         timestamptz NOT NULL,
  total_charged       numeric(10,2),
  payment_method      text CHECK (payment_method IN ('cash','card','transfer','other')),
  recorded_by_user_id bigint REFERENCES users(id),
  recorded_at         timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX visits_business_occurred ON visits (business_id, occurred_at);
CREATE INDEX visits_client            ON visits (client_id);

-- Historial de la cita. Append-only: nunca se actualiza ni se borra.
CREATE TABLE appointment_events (
  id             bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  appointment_id bigint NOT NULL REFERENCES appointments(id) ON DELETE CASCADE,
  actor_user_id  bigint REFERENCES users(id),
  action         text NOT NULL,   -- created|rescheduled|cancelled|attended|no_show
  from_status    text,
  to_status      text,
  detail         jsonb,
  created_at     timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX appointment_events_appointment ON appointment_events (appointment_id, created_at);

-- Quién cambió qué, cuándo y desde dónde.
CREATE TABLE audit_log (
  id            bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id   bigint,
  actor_user_id bigint REFERENCES users(id),
  entity        text NOT NULL,
  entity_id     bigint,
  action        text NOT NULL,
  before        jsonb,
  after         jsonb,
  ip            text,
  created_at    timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX audit_log_business_created ON audit_log (business_id, created_at DESC);
CREATE INDEX audit_log_entity           ON audit_log (entity, entity_id);

-- El cierre de día. Una fila por día cerrado; la restricción única es lo que
-- hace que cerrar dos veces no sea posible.
CREATE TABLE day_closures (
  id                bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  business_id       bigint NOT NULL REFERENCES businesses(id) ON DELETE CASCADE,
  business_date     date NOT NULL,
  closed_by_user_id bigint NOT NULL REFERENCES users(id),
  closed_at         timestamptz NOT NULL DEFAULT now(),
  attended_count    integer NOT NULL,
  no_show_count     integer NOT NULL,
  cancelled_count   integer NOT NULL,
  UNIQUE (business_id, business_date)
);