-- 020_requisitions.sql
-- Employee Requisition (Annexure A) as its own table, separate from
-- candidate_forms (Interview Analysis / Cultural Fit). Nested request objects
-- flatten onto columns: position.title → position_title, replacement_for.title
-- → recruitment_title, refferal_by → employee_name / employee_department.
-- employment type is a CHECK over EmploymentType values, not a native PG enum
-- (point releases of the Python enum should not require a type ALTER).
--
-- "date" and "type" are quoted: both are PostgreSQL keywords.
--
-- Idempotent, applied automatically at startup by alembic_setup.run_manual_sql()
-- and recorded in manual_migrations. Matches Requisition in
-- backend/candidate_forms/models.py (needed here because prod boots with
-- DB_AUTOGENERATE=false and never autogenerates new tables).

CREATE TABLE IF NOT EXISTS app.requisitions (
    id                    uuid PRIMARY KEY,
    department            varchar,
    position_title        varchar,
    "date"                date,
    date_needed           date,
    "type"                varchar
                          CHECK ("type" IS NULL OR "type" IN (
                              'permanent', 'contract', 'temporary', 'internee'
                          )),
    job_description        text,

    employee_name         varchar,
    employee_department   varchar,

    to_replace            varchar,
    grade                 varchar,
    recruitment_title     varchar,
    date_separated        date,
    justification         text,
    budget                varchar,
    recommended_grade      varchar,

    initiated_by          varchar,
    initiated_date        date,
    recommended_by       varchar,
    recommended_date     date,
    approved_by_hr        boolean,
    approved_by_date_hr   date,
    approved_by_vp        boolean,
    approved_by_date_vp   date,
    approved_by_svp       boolean,
    approved_by_date_svp  date,

    created_by            uuid REFERENCES app.users(id),
    created_at            timestamptz NOT NULL DEFAULT NOW(),
    updated_at           timestamptz NOT NULL DEFAULT NOW(),
    is_deleted            boolean NOT NULL DEFAULT false
);

CREATE INDEX IF NOT EXISTS ix_requisitions_created_by
    ON app.requisitions (created_by);

CREATE INDEX IF NOT EXISTS ix_requisitions_is_deleted
    ON app.requisitions (is_deleted);