-- Tutor Platform Initial Schema

CREATE TABLE IF NOT EXISTS interview_sessions (
    id TEXT PRIMARY KEY,
    user_id TEXT NOT NULL,
    target_role TEXT NOT NULL,
    stack JSONB NOT NULL DEFAULT '[]',
    interview_timeline TEXT NOT NULL,
    questions JSONB NOT NULL DEFAULT '[]',
    answers JSONB NOT NULL DEFAULT '[]',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS learner_profiles (
    user_id TEXT PRIMARY KEY,
    target_role TEXT NOT NULL,
    stack JSONB NOT NULL DEFAULT '[]',
    interview_timeline TEXT NOT NULL,
    preferences JSONB NOT NULL DEFAULT '{}',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS learner_mastery (
    user_id TEXT NOT NULL,
    concept_id TEXT NOT NULL,
    concept_label TEXT NOT NULL,
    state TEXT NOT NULL DEFAULT 'unknown',
    evidence JSONB NOT NULL DEFAULT '[]',
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    PRIMARY KEY (user_id, concept_id)
);

CREATE TABLE IF NOT EXISTS learner_misconceptions (
    id TEXT PRIMARY KEY,
    user_id TEXT NOT NULL,
    concept JSONB NOT NULL DEFAULT '{}',
    description TEXT NOT NULL,
    evidence JSONB NOT NULL DEFAULT '[]',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS learner_interventions (
    id TEXT PRIMARY KEY,
    user_id TEXT NOT NULL,
    kind TEXT NOT NULL,
    reason TEXT NOT NULL,
    concept JSONB NOT NULL DEFAULT '{}',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS learner_review_schedules (
    id TEXT PRIMARY KEY,
    user_id TEXT NOT NULL,
    concept JSONB NOT NULL DEFAULT '{}',
    due_at TIMESTAMPTZ NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS ontology_materials (
    id TEXT PRIMARY KEY,
    title TEXT NOT NULL,
    source_type TEXT NOT NULL,
    body TEXT NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS ontology_concepts (
    id TEXT PRIMARY KEY,
    material_id TEXT NOT NULL,
    concept_id TEXT NOT NULL,
    concept_label TEXT NOT NULL,
    summary TEXT NOT NULL,
    review_state TEXT NOT NULL DEFAULT 'candidate',
    evidence JSONB NOT NULL DEFAULT '[]',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS ontology_edges (
    id TEXT PRIMARY KEY,
    from_concept_id TEXT NOT NULL,
    to_concept_id TEXT NOT NULL,
    kind TEXT NOT NULL,
    evidence JSONB NOT NULL DEFAULT '[]',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS ontology_gaps (
    id TEXT PRIMARY KEY,
    concept_id TEXT NOT NULL,
    reason TEXT NOT NULL,
    evidence JSONB NOT NULL DEFAULT '[]',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS teaching_asset_prompts (
    id TEXT PRIMARY KEY,
    concept_id TEXT NOT NULL,
    asset_type TEXT NOT NULL,
    prompt TEXT NOT NULL,
    model_key TEXT NOT NULL,
    review_state TEXT NOT NULL DEFAULT 'candidate',
    requires_model_id_verification BOOLEAN NOT NULL DEFAULT TRUE,
    source_evidence JSONB NOT NULL DEFAULT '[]',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);