CREATE TABLE skills_edu.skill_details (
  id uuid PRIMARY KEY REFERENCES public.skills(id) ON DELETE RESTRICT,
  name_en varchar(255),
  description_pt text,
  description_en text,
  category varchar(30) NOT NULL CHECK (category IN ('technical','transversal','digital','management','language','other')),
  skill_type varchar(30) NOT NULL DEFAULT 'competency',
  default_level varchar(30),
  source_name varchar(255),
  source_version varchar(100),
  status varchar(20) NOT NULL DEFAULT 'active' CHECK (status IN ('draft','active','inactive','archived')),
  created_by bigint,
  updated_by bigint,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  deleted_at timestamptz
);

CREATE TABLE skills_edu.occupation_details (
  id uuid PRIMARY KEY REFERENCES public.occupations(id) ON DELETE RESTRICT,
  name_en varchar(255),
  description_pt text,
  description_en text,
  occupational_family varchar(150),
  sector_master_id bigint,
  qualification_level varchar(80),
  minimum_experience_months integer CHECK (minimum_experience_months IS NULL OR minimum_experience_months >= 0),
  status varchar(20) NOT NULL DEFAULT 'active' CHECK (status IN ('draft','active','inactive','archived')),
  created_by bigint,
  updated_by bigint,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  deleted_at timestamptz
);

CREATE TABLE skills_edu.occupation_skills (
  occupation_id uuid NOT NULL REFERENCES public.occupations(id) ON DELETE CASCADE,
  skill_id uuid NOT NULL REFERENCES public.skills(id) ON DELETE RESTRICT,
  requirement_type varchar(20) NOT NULL DEFAULT 'required' CHECK (requirement_type IN ('required','desired')),
  minimum_level varchar(30),
  weight numeric(5,2) CHECK (weight IS NULL OR weight BETWEEN 0 AND 100),
  approved_at timestamptz,
  approved_by bigint,
  created_at timestamptz NOT NULL DEFAULT now(),
  PRIMARY KEY (occupation_id, skill_id, requirement_type)
);

CREATE INDEX idx_skills_category_status ON skills_edu.skill_details(category,status) WHERE deleted_at IS NULL;
CREATE INDEX idx_occupations_sector_status ON skills_edu.occupation_details(sector_master_id,status) WHERE deleted_at IS NULL;
CREATE TRIGGER trg_skills_updated_at BEFORE UPDATE ON skills_edu.skill_details FOR EACH ROW EXECUTE FUNCTION skills_edu.set_updated_at();
CREATE TRIGGER trg_occupations_updated_at BEFORE UPDATE ON skills_edu.occupation_details FOR EACH ROW EXECUTE FUNCTION skills_edu.set_updated_at();

ALTER TABLE skills_edu.skill_details ADD FOREIGN KEY (created_by) REFERENCES public.users(id) ON DELETE RESTRICT;

ALTER TABLE skills_edu.skill_details ADD FOREIGN KEY (updated_by) REFERENCES public.users(id) ON DELETE RESTRICT;

ALTER TABLE skills_edu.occupation_details ADD FOREIGN KEY (created_by) REFERENCES public.users(id) ON DELETE RESTRICT;

ALTER TABLE skills_edu.occupation_details ADD FOREIGN KEY (updated_by) REFERENCES public.users(id) ON DELETE RESTRICT;

ALTER TABLE skills_edu.occupation_details ADD FOREIGN KEY (sector_master_id) REFERENCES public.sectors(id) ON DELETE RESTRICT;

ALTER TABLE skills_edu.occupation_skills ADD FOREIGN KEY (approved_by) REFERENCES public.users(id) ON DELETE RESTRICT;