-- bactdb
-- Matthew R Dillon

CREATE TABLE measurements (
    id BIGSERIAL NOT NULL,
    strain_id BIGINT NOT NULL,
    characteristic_id BIGINT NOT NULL,
    text_measurement_type_id BIGINT NULL,
    txt_value TEXT NULL,
    num_value NUMERIC(8, 3) NULL,
    confidence_interval NUMERIC(8, 3) NULL,
    unit_type_id BIGINT NULL,
    notes TEXT NULL,
    test_method_id BIGINT NULL,

    created_at TIMESTAMP WITH TIME ZONE NOT NULL,
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL,

    CONSTRAINT strainscharmeasurements_pkey PRIMARY KEY (id),
    FOREIGN KEY (strain_id) REFERENCES strains(id),
    FOREIGN KEY (characteristic_id) REFERENCES characteristics(id),
    FOREIGN KEY (text_measurement_type_id) REFERENCES text_measurement_types(id),
    FOREIGN KEY (unit_type_id) REFERENCES unit_types(id),
    FOREIGN KEY (test_method_id) REFERENCES test_methods(id),
    CONSTRAINT exclusive_data_type CHECK (
        (text_measurement_type_id IS NOT NULL
            AND txt_value IS NULL
            AND num_value IS NULL
            AND confidence_interval IS NULL
            AND unit_type_id IS NULL)
        OR
        (text_measurement_type_id IS NULL
            AND txt_value IS NULL
            AND num_value IS NOT NULL)
        OR
        (text_measurement_type_id IS NULL
            AND txt_value IS NOT NULL
            AND num_value IS NULL
            AND confidence_interval IS NULL
            AND unit_type_id IS NULL))
);

CREATE INDEX strain_id_idx ON measurements (strain_id);

CREATE INDEX characteristic_id_idx ON measurements (characteristic_id);

CREATE INDEX text_measurement_type_id_idx ON measurements (text_measurement_type_id);

CREATE INDEX unit_type_id_idx ON measurements (unit_type_id);

CREATE INDEX test_method_id_idx ON measurements (test_method_id);