-- Uniques and indexes to enforce data integrity and performance

-- Unique, case-insensitive names
CREATE UNIQUE INDEX IF NOT EXISTS ux_make_name ON vehicles.make (lower(name));
CREATE UNIQUE INDEX IF NOT EXISTS ux_model_make_name ON vehicles.model (make_id, lower(name));

-- Model/Year availability
ALTER TABLE vehicles.model_year
  ADD CONSTRAINT ux_model_year UNIQUE (model_id, year);
CREATE INDEX IF NOT EXISTS ix_model_year_year_model ON vehicles.model_year (year, model_id);

-- Trims are unique per model_year by name (case-insensitive)
CREATE UNIQUE INDEX IF NOT EXISTS ux_trim_modelyear_name ON vehicles.trim (model_year_id, lower(name));
CREATE INDEX IF NOT EXISTS ix_trim_modelyear_name ON vehicles.trim (model_year_id, name);

-- Engine uniqueness (prefer code when present)
CREATE UNIQUE INDEX IF NOT EXISTS ux_engine_code_not_null ON vehicles.engine (code) WHERE code IS NOT NULL;
CREATE UNIQUE INDEX IF NOT EXISTS ux_engine_name ON vehicles.engine (lower(name));

-- Bridge indexes
CREATE INDEX IF NOT EXISTS ix_trim_engine_trim ON vehicles.trim_engine (trim_id);
CREATE INDEX IF NOT EXISTS ix_trim_engine_engine ON vehicles.trim_engine (engine_id);