-- ============================================================
-- Migration: 000_message_base.sql
-- Tables:  message
-- ============================================================
-- Core message table managed by imks. All companion tables
-- (thread, attachment, embed, reaction, ...) reference message(id).

BEGIN;

CREATE TABLE IF NOT EXISTS message (
    id                  UUID PRIMARY KEY,
    channel_id          UUID NOT NULL,
    author_id           UUID NOT NULL,
    thread_id           UUID NULL,
    reply_to_message_id UUID NULL REFERENCES message(id) ON DELETE SET NULL,
    message_type        TEXT NOT NULL DEFAULT 'text',
    body                TEXT NOT NULL,
    metadata            JSONB NULL,
    pinned              BOOLEAN NOT NULL DEFAULT FALSE,
    system              BOOLEAN NOT NULL DEFAULT FALSE,
    edited_at           TIMESTAMPTZ NULL,
    deleted_at          TIMESTAMPTZ NULL,
    created_at          TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at          TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Cursor pagination: WHERE id < $cursor ORDER BY id DESC
CREATE INDEX IF NOT EXISTS idx_message_channel_created
    ON message (channel_id, created_at DESC);

CREATE INDEX IF NOT EXISTS idx_message_author
    ON message (author_id);

CREATE INDEX IF NOT EXISTS idx_message_thread
    ON message (thread_id)
    WHERE thread_id IS NOT NULL;

CREATE INDEX IF NOT EXISTS idx_message_reply_to
    ON message (reply_to_message_id)
    WHERE reply_to_message_id IS NOT NULL;

CREATE INDEX IF NOT EXISTS idx_message_deleted
    ON message (deleted_at)
    WHERE deleted_at IS NOT NULL;

COMMIT;