-- Chat Switchboard — 006 Knowledge Bases (SQLite)

CREATE TABLE IF NOT EXISTS knowledge_bases (
    id              TEXT PRIMARY KEY,
    name            TEXT NOT NULL,
    description     TEXT NOT NULL DEFAULT '',
    scope           TEXT NOT NULL DEFAULT 'global',
    owner_id        TEXT REFERENCES users(id) ON DELETE CASCADE,
    team_id         TEXT REFERENCES teams(id) ON DELETE CASCADE,
    embedding_config TEXT NOT NULL DEFAULT '{}',
    document_count  INTEGER NOT NULL DEFAULT 0,
    chunk_count     INTEGER NOT NULL DEFAULT 0,
    total_bytes     INTEGER NOT NULL DEFAULT 0,
    status          TEXT NOT NULL DEFAULT 'active',
    discoverable    INTEGER NOT NULL DEFAULT 1,
    created_at      TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at      TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_kb_scope ON knowledge_bases(scope);
CREATE INDEX IF NOT EXISTS idx_kb_owner ON knowledge_bases(owner_id);
CREATE INDEX IF NOT EXISTS idx_kb_team ON knowledge_bases(team_id);

CREATE TABLE IF NOT EXISTS kb_documents (
    id              TEXT PRIMARY KEY,
    kb_id           TEXT NOT NULL REFERENCES knowledge_bases(id) ON DELETE CASCADE,
    filename        TEXT NOT NULL,
    content_type    TEXT NOT NULL,
    size_bytes      INTEGER NOT NULL,
    storage_key     TEXT NOT NULL,
    extracted_text  TEXT,
    chunk_count     INTEGER NOT NULL DEFAULT 0,
    status          TEXT NOT NULL DEFAULT 'pending',
    error           TEXT,
    uploaded_by     TEXT NOT NULL REFERENCES users(id),
    created_at      TEXT NOT NULL DEFAULT (datetime('now')),
    updated_at      TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_kbdoc_kb ON kb_documents(kb_id);

CREATE TABLE IF NOT EXISTS kb_chunks (
    id              TEXT PRIMARY KEY,
    kb_id           TEXT NOT NULL REFERENCES knowledge_bases(id) ON DELETE CASCADE,
    document_id     TEXT NOT NULL REFERENCES kb_documents(id) ON DELETE CASCADE,
    chunk_index     INTEGER NOT NULL,
    content         TEXT NOT NULL,
    token_count     INTEGER NOT NULL DEFAULT 0,
    metadata        TEXT NOT NULL DEFAULT '{}',
    created_at      TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_kbchunk_kb ON kb_chunks(kb_id);
CREATE INDEX IF NOT EXISTS idx_kbchunk_doc ON kb_chunks(document_id);

CREATE TABLE IF NOT EXISTS channel_knowledge_bases (
    channel_id  TEXT NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    kb_id       TEXT NOT NULL REFERENCES knowledge_bases(id) ON DELETE CASCADE,
    enabled     INTEGER NOT NULL DEFAULT 1,
    added_at    TEXT NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (channel_id, kb_id)
);

CREATE TABLE IF NOT EXISTS persona_knowledge_bases (
    persona_id  TEXT NOT NULL REFERENCES personas(id) ON DELETE CASCADE,
    kb_id       TEXT NOT NULL REFERENCES knowledge_bases(id) ON DELETE CASCADE,
    auto_search INTEGER NOT NULL DEFAULT 0,
    added_at    TEXT NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (persona_id, kb_id)
);

CREATE INDEX IF NOT EXISTS idx_persona_kb_persona ON persona_knowledge_bases(persona_id);
CREATE INDEX IF NOT EXISTS idx_persona_kb_kb ON persona_knowledge_bases(kb_id);