-- Phase 5B §2 — programs: first-class learning products, distinct from curriculum JSON itself
-- (a program is the commercial/academic unit a student enrolls in; curriculum_path is still
-- just the content it points at, unchanged since Phase 1). program_id IS the slug — same
-- convention as assessment_definitions/cohorts (a single TEXT primary key, no separate numeric
-- id + slug pair).
--
-- family is the init_/compile_/root_ youth-engineering ladder (see
-- docs/PHASE5B_SELF_PACED_ENROLLMENT.md §1) — only 'root' has real curriculum content today;
-- init/compile rows can be added later without a schema change, they just won't have a working
-- curriculum_path yet. delivery_mode describes how the program is normally taken; an
-- individual enrollment can still snapshot a different mode (see 020_enrollments.sql).
--
-- version is a plain incrementing integer, matching assessment_definitions' existing
-- versioning convention — enrollments snapshot the version+curriculum_path they were created
-- against so a later edit to a program never silently changes what an already-enrolled
-- student is being held to.
CREATE TABLE IF NOT EXISTS programs (
  program_id               TEXT PRIMARY KEY,        -- slug, e.g. 'root-kubernetes-foundations'
  name                      TEXT NOT NULL,
  description               TEXT,
  family                    TEXT NOT NULL CHECK (family IN ('init', 'compile', 'root')),
  delivery_mode             TEXT NOT NULL DEFAULT 'self_paced' CHECK (delivery_mode IN ('self_paced', 'cohort', 'hybrid')),
  curriculum_path           TEXT NOT NULL DEFAULT 'rootnode-path',
  completion_assessment_id  TEXT REFERENCES assessment_definitions(assessment_definition_id),
  estimated_duration_hours  INTEGER,
  version                   INTEGER NOT NULL DEFAULT 1,
  status                    TEXT NOT NULL DEFAULT 'active' CHECK (status IN ('active', 'inactive')),
  created_by                UUID REFERENCES instructors(instructor_id),
  created_at                TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at                TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_programs_status ON programs(status);
CREATE INDEX IF NOT EXISTS idx_programs_family ON programs(family);

-- Seed: the one legitimate self-paced program this phase ships, wrapping the EXISTING
-- RootNode/Kubernetes curriculum and capstone — no new curriculum content invented. init_/
-- compile_ programs are intentionally NOT seeded (no real curriculum for them yet, per this
-- phase's explicit scope line).
INSERT INTO programs (program_id, name, description, family, delivery_mode, curriculum_path, completion_assessment_id, estimated_duration_hours)
VALUES (
  'root-kubernetes-foundations', 'ROOT — Kubernetes Foundations',
  'Self-paced Linux, containers, and Kubernetes operations — the existing RootNode curriculum, from Foundations through the RootNode Capstone.',
  'root', 'self_paced', 'rootnode-path', 'rootnode-capstone', 40
) ON CONFLICT (program_id) DO NOTHING;