-- Second brain: Telegram graph + pgvector (768 = nomic-embed-text)
CREATE EXTENSION IF NOT EXISTS vector;

CREATE TABLE IF NOT EXISTS telegram_conversations (
    id              SERIAL PRIMARY KEY,
    chat_id         BIGINT NOT NULL UNIQUE,
    chat_type       VARCHAR(32) DEFAULT 'private',
    user_name       TEXT,
    user_role       VARCHAR(32),
    metadata        JSONB DEFAULT '{}',
    created_at      TIMESTAMPTZ DEFAULT NOW(),
    updated_at      TIMESTAMPTZ DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS telegram_messages (
    id                  SERIAL PRIMARY KEY,
    conversation_id     INT NOT NULL REFERENCES telegram_conversations(id) ON DELETE CASCADE,
    telegram_message_id BIGINT,
    direction           VARCHAR(8) NOT NULL CHECK (direction IN ('in', 'out')),
    role                VARCHAR(16) NOT NULL DEFAULT 'user',
    content_type        VARCHAR(32) DEFAULT 'text',
    content_text        TEXT,
    content_json        JSONB DEFAULT '{}',
    reply_to_message_id INT REFERENCES telegram_messages(id) ON DELETE SET NULL,
    agent_name          VARCHAR(64),
    agent_event_id      INT REFERENCES agent_events(id) ON DELETE SET NULL,
    channel             VARCHAR(32) DEFAULT 'telegram',
    created_at          TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_tg_msg_conv_created ON telegram_messages(conversation_id, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_tg_msg_telegram_id ON telegram_messages(telegram_message_id);
CREATE INDEX IF NOT EXISTS idx_tg_msg_fts ON telegram_messages
    USING gin(to_tsvector('simple', coalesce(content_text, '')));

CREATE TABLE IF NOT EXISTS telegram_message_embeddings (
    id              SERIAL PRIMARY KEY,
    message_id      INT NOT NULL REFERENCES telegram_messages(id) ON DELETE CASCADE,
    chunk_index     INT DEFAULT 0,
    embedding       vector(768) NOT NULL,
    model           VARCHAR(64) DEFAULT 'nomic-embed-text',
    created_at      TIMESTAMPTZ DEFAULT NOW(),
    UNIQUE (message_id, chunk_index)
);

CREATE INDEX IF NOT EXISTS idx_tg_emb_hnsw ON telegram_message_embeddings
    USING hnsw (embedding vector_cosine_ops);

CREATE TABLE IF NOT EXISTS telegram_message_edges (
    id                  SERIAL PRIMARY KEY,
    source_message_id   INT NOT NULL REFERENCES telegram_messages(id) ON DELETE CASCADE,
    target_message_id   INT REFERENCES telegram_messages(id) ON DELETE SET NULL,
    target_entity_type  VARCHAR(64),
    target_entity_id    INT,
    edge_type           VARCHAR(64) NOT NULL,
    weight              FLOAT DEFAULT 1.0,
    metadata            JSONB DEFAULT '{}',
    created_at          TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_tg_edges_source ON telegram_message_edges(source_message_id);
CREATE INDEX IF NOT EXISTS idx_tg_edges_target ON telegram_message_edges(target_message_id);
CREATE INDEX IF NOT EXISTS idx_tg_edges_type ON telegram_message_edges(edge_type);
CREATE INDEX IF NOT EXISTS idx_tg_edges_entity ON telegram_message_edges(target_entity_type, target_entity_id);

CREATE OR REPLACE VIEW telegram_graph_view AS
SELECT
    e.id AS edge_id,
    e.edge_type,
    e.weight,
    e.target_entity_type,
    e.target_entity_id,
    sm.id AS source_id,
    sm.content_text AS source_text,
    sm.direction AS source_direction,
    sm.agent_name AS source_agent,
    tm.id AS target_id,
    tm.content_text AS target_text,
    c.chat_id,
    e.created_at
FROM telegram_message_edges e
JOIN telegram_messages sm ON sm.id = e.source_message_id
LEFT JOIN telegram_messages tm ON tm.id = e.target_message_id
JOIN telegram_conversations c ON c.id = sm.conversation_id;