-- =====================================================
-- SCHEMA: hr
-- PROPOSITO: Human Resources Management
-- MODULOS: MGN-HR (Recursos Humanos)
-- FECHA: 2025-11-24
-- =====================================================

-- Crear schema
CREATE SCHEMA IF NOT EXISTS hr;

-- =====================================================
-- TYPES (ENUMs)
-- =====================================================

CREATE TYPE hr.contract_status AS ENUM (
  'draft',
  'active',
  'expired',
  'terminated',
  'cancelled'
);

CREATE TYPE hr.contract_type AS ENUM (
  'permanent',
  'temporary',
  'contractor',
  'internship',
  'part_time'
);

CREATE TYPE hr.leave_status AS ENUM (
  'draft',
  'submitted',
  'approved',
  'rejected',
  'cancelled'
);

CREATE TYPE hr.leave_type AS ENUM (
  'vacation',
  'sick',
  'personal',
  'maternity',
  'paternity',
  'bereavement',
  'unpaid',
  'other'
);

CREATE TYPE hr.employee_status AS ENUM (
  'active',
  'inactive',
  'on_leave',
  'terminated'
);

-- =====================================================
-- TABLES
-- =====================================================

-- Tabla: departments (Departamentos)
CREATE TABLE hr.departments (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
  company_id UUID NOT NULL REFERENCES auth.companies(id) ON DELETE CASCADE,

  name VARCHAR(100) NOT NULL,
  code VARCHAR(20),
  parent_id UUID REFERENCES hr.departments(id),
  manager_id UUID, -- References employees, set after table creation

  description TEXT,
  color VARCHAR(20),

  active BOOLEAN DEFAULT TRUE,
  created_by UUID REFERENCES auth.users(id),
  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,

  UNIQUE(tenant_id, company_id, name)
);

-- Tabla: job_positions (Puestos de trabajo)
CREATE TABLE hr.job_positions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,

  name VARCHAR(100) NOT NULL,
  department_id UUID REFERENCES hr.departments(id),

  description TEXT,
  requirements TEXT,
  responsibilities TEXT,

  min_salary DECIMAL(15, 2),
  max_salary DECIMAL(15, 2),

  active BOOLEAN DEFAULT TRUE,
  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,

  UNIQUE(tenant_id, name)
);

-- Tabla: employees (Empleados)
CREATE TABLE hr.employees (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
  company_id UUID NOT NULL REFERENCES auth.companies(id) ON DELETE CASCADE,

  -- Identificacion
  employee_number VARCHAR(50) NOT NULL,
  first_name VARCHAR(100) NOT NULL,
  last_name VARCHAR(100) NOT NULL,
  middle_name VARCHAR(100),

  -- Usuario vinculado (opcional)
  user_id UUID REFERENCES auth.users(id),

  -- Informacion personal
  birth_date DATE,
  gender VARCHAR(20),
  marital_status VARCHAR(20),
  nationality VARCHAR(100),
  identification_id VARCHAR(50),
  identification_type VARCHAR(50),
  social_security_number VARCHAR(50),
  tax_id VARCHAR(50),

  -- Contacto
  email VARCHAR(255),
  work_email VARCHAR(255),
  phone VARCHAR(50),
  work_phone VARCHAR(50),
  mobile VARCHAR(50),
  emergency_contact VARCHAR(255),
  emergency_phone VARCHAR(50),

  -- Direccion
  street VARCHAR(255),
  city VARCHAR(100),
  state VARCHAR(100),
  zip VARCHAR(20),
  country VARCHAR(100),

  -- Trabajo
  department_id UUID REFERENCES hr.departments(id),
  job_position_id UUID REFERENCES hr.job_positions(id),
  manager_id UUID REFERENCES hr.employees(id),

  hire_date DATE NOT NULL,
  termination_date DATE,
  status hr.employee_status NOT NULL DEFAULT 'active',

  -- Datos bancarios
  bank_name VARCHAR(100),
  bank_account VARCHAR(50),
  bank_clabe VARCHAR(20),

  -- Foto
  photo_url VARCHAR(500),

  -- Notas
  notes TEXT,

  -- Auditoria
  created_by UUID REFERENCES auth.users(id),
  updated_by UUID REFERENCES auth.users(id),
  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,

  UNIQUE(tenant_id, employee_number)
);

-- Add manager_id reference to departments
ALTER TABLE hr.departments ADD CONSTRAINT fk_departments_manager
  FOREIGN KEY (manager_id) REFERENCES hr.employees(id);

-- Tabla: contracts (Contratos laborales)
CREATE TABLE hr.contracts (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
  company_id UUID NOT NULL REFERENCES auth.companies(id) ON DELETE CASCADE,

  employee_id UUID NOT NULL REFERENCES hr.employees(id) ON DELETE CASCADE,

  -- Identificacion
  name VARCHAR(100) NOT NULL,
  reference VARCHAR(100),

  -- Tipo y estado
  contract_type hr.contract_type NOT NULL,
  status hr.contract_status NOT NULL DEFAULT 'draft',

  -- Puesto
  job_position_id UUID REFERENCES hr.job_positions(id),
  department_id UUID REFERENCES hr.departments(id),

  -- Vigencia
  date_start DATE NOT NULL,
  date_end DATE,
  trial_date_end DATE,

  -- Compensacion
  wage DECIMAL(15, 2) NOT NULL,
  wage_type VARCHAR(20) DEFAULT 'monthly', -- hourly, daily, weekly, monthly, yearly
  currency_id UUID REFERENCES core.currencies(id),

  -- Horas
  resource_calendar_id UUID, -- For future scheduling module
  hours_per_week DECIMAL(5, 2) DEFAULT 40,

  -- Beneficios y deducciones
  vacation_days INTEGER DEFAULT 6,
  christmas_bonus_days INTEGER DEFAULT 15,

  -- Documentos
  document_url VARCHAR(500),

  -- Notas
  notes TEXT,

  -- Auditoria
  created_by UUID REFERENCES auth.users(id),
  updated_by UUID REFERENCES auth.users(id),
  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- Tabla: leave_types (Tipos de ausencia configurables)
CREATE TABLE hr.leave_types (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,

  name VARCHAR(100) NOT NULL,
  code VARCHAR(20),
  leave_type hr.leave_type NOT NULL,

  requires_approval BOOLEAN DEFAULT TRUE,
  max_days INTEGER,
  is_paid BOOLEAN DEFAULT TRUE,

  color VARCHAR(20),

  active BOOLEAN DEFAULT TRUE,
  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,

  UNIQUE(tenant_id, name)
);

-- Tabla: leaves (Ausencias/Permisos)
CREATE TABLE hr.leaves (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  tenant_id UUID NOT NULL REFERENCES auth.tenants(id) ON DELETE CASCADE,
  company_id UUID NOT NULL REFERENCES auth.companies(id) ON DELETE CASCADE,

  employee_id UUID NOT NULL REFERENCES hr.employees(id) ON DELETE CASCADE,
  leave_type_id UUID NOT NULL REFERENCES hr.leave_types(id),

  -- Solicitud
  name VARCHAR(255),
  date_from DATE NOT NULL,
  date_to DATE NOT NULL,
  number_of_days DECIMAL(5, 2) NOT NULL,

  -- Estado
  status hr.leave_status NOT NULL DEFAULT 'draft',

  -- Descripcion
  description TEXT,

  -- Aprobacion
  approved_by UUID REFERENCES auth.users(id),
  approved_at TIMESTAMP WITH TIME ZONE,
  rejection_reason TEXT,

  -- Auditoria
  created_by UUID REFERENCES auth.users(id),
  updated_by UUID REFERENCES auth.users(id),
  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
);

-- =====================================================
-- INDEXES
-- =====================================================

CREATE INDEX idx_departments_tenant ON hr.departments(tenant_id);
CREATE INDEX idx_departments_company ON hr.departments(company_id);
CREATE INDEX idx_departments_parent ON hr.departments(parent_id);

CREATE INDEX idx_job_positions_tenant ON hr.job_positions(tenant_id);
CREATE INDEX idx_job_positions_department ON hr.job_positions(department_id);

CREATE INDEX idx_employees_tenant ON hr.employees(tenant_id);
CREATE INDEX idx_employees_company ON hr.employees(company_id);
CREATE INDEX idx_employees_department ON hr.employees(department_id);
CREATE INDEX idx_employees_manager ON hr.employees(manager_id);
CREATE INDEX idx_employees_user ON hr.employees(user_id);
CREATE INDEX idx_employees_status ON hr.employees(status);
CREATE INDEX idx_employees_number ON hr.employees(employee_number);

CREATE INDEX idx_contracts_tenant ON hr.contracts(tenant_id);
CREATE INDEX idx_contracts_employee ON hr.contracts(employee_id);
CREATE INDEX idx_contracts_status ON hr.contracts(status);
CREATE INDEX idx_contracts_dates ON hr.contracts(date_start, date_end);

CREATE INDEX idx_leave_types_tenant ON hr.leave_types(tenant_id);

CREATE INDEX idx_leaves_tenant ON hr.leaves(tenant_id);
CREATE INDEX idx_leaves_employee ON hr.leaves(employee_id);
CREATE INDEX idx_leaves_status ON hr.leaves(status);
CREATE INDEX idx_leaves_dates ON hr.leaves(date_from, date_to);

-- =====================================================
-- TRIGGERS
-- =====================================================

CREATE TRIGGER update_departments_timestamp
  BEFORE UPDATE ON hr.departments
  FOR EACH ROW EXECUTE FUNCTION core.update_timestamp();

CREATE TRIGGER update_job_positions_timestamp
  BEFORE UPDATE ON hr.job_positions
  FOR EACH ROW EXECUTE FUNCTION core.update_timestamp();

CREATE TRIGGER update_employees_timestamp
  BEFORE UPDATE ON hr.employees
  FOR EACH ROW EXECUTE FUNCTION core.update_timestamp();

CREATE TRIGGER update_contracts_timestamp
  BEFORE UPDATE ON hr.contracts
  FOR EACH ROW EXECUTE FUNCTION core.update_timestamp();

CREATE TRIGGER update_leaves_timestamp
  BEFORE UPDATE ON hr.leaves
  FOR EACH ROW EXECUTE FUNCTION core.update_timestamp();

-- =====================================================
-- ROW LEVEL SECURITY
-- =====================================================

-- Habilitar RLS
ALTER TABLE hr.departments ENABLE ROW LEVEL SECURITY;
ALTER TABLE hr.job_positions ENABLE ROW LEVEL SECURITY;
ALTER TABLE hr.employees ENABLE ROW LEVEL SECURITY;
ALTER TABLE hr.contracts ENABLE ROW LEVEL SECURITY;
ALTER TABLE hr.leave_types ENABLE ROW LEVEL SECURITY;
ALTER TABLE hr.leaves ENABLE ROW LEVEL SECURITY;

-- Políticas de aislamiento por tenant
CREATE POLICY tenant_isolation_departments ON hr.departments
  USING (tenant_id = current_setting('app.current_tenant_id', true)::uuid);

CREATE POLICY tenant_isolation_job_positions ON hr.job_positions
  USING (tenant_id = current_setting('app.current_tenant_id', true)::uuid);

CREATE POLICY tenant_isolation_employees ON hr.employees
  USING (tenant_id = current_setting('app.current_tenant_id', true)::uuid);

CREATE POLICY tenant_isolation_contracts ON hr.contracts
  USING (tenant_id = current_setting('app.current_tenant_id', true)::uuid);

CREATE POLICY tenant_isolation_leave_types ON hr.leave_types
  USING (tenant_id = current_setting('app.current_tenant_id', true)::uuid);

CREATE POLICY tenant_isolation_leaves ON hr.leaves
  USING (tenant_id = current_setting('app.current_tenant_id', true)::uuid);

-- =====================================================
-- COMMENTS
-- =====================================================

COMMENT ON TABLE hr.departments IS 'Departamentos de la organizacion';
COMMENT ON TABLE hr.job_positions IS 'Puestos de trabajo/posiciones';
COMMENT ON TABLE hr.employees IS 'Empleados de la organizacion';
COMMENT ON TABLE hr.contracts IS 'Contratos laborales';
COMMENT ON TABLE hr.leave_types IS 'Tipos de ausencia configurables';
COMMENT ON TABLE hr.leaves IS 'Solicitudes de ausencias/permisos';