-- t-paliad-147: Bulk team email — paliad.email_broadcasts.
--
-- Records every bulk-send sent from /team's "E-Mail an Auswahl" flow.
-- Powers the /admin/broadcasts viewer (global_admin sees all rows;
-- senders see their own).
--
-- recipient_filter snapshots the filter chips the sender had selected
-- (project_ids, offices, roles) so a future deploy that tweaks the
-- filter UX can still render past sends. recipient_user_ids snapshots
-- the resolved user list — the actual addressees, immune to later
-- team-membership changes.
--
-- Sections:
--   1. CREATE paliad.email_broadcasts.
--   2. Indexes.
--   3. RLS.

-- ============================================================================
-- 1. paliad.email_broadcasts
-- ============================================================================

CREATE TABLE paliad.email_broadcasts (
    id                   uuid          PRIMARY KEY DEFAULT gen_random_uuid(),

    -- Renderable subject (post-template). Stored verbatim for audit.
    subject              text          NOT NULL,

    -- Body source as the sender typed it (Markdown). NOT the per-recipient
    -- rendered output — those are reconstructable by re-rendering with the
    -- snapshotted recipient row, but the source is what we audit.
    body                 text          NOT NULL,

    -- The sender. FK to paliad.users (not auth.users) so deleting an auth
    -- row leaves the audit trail intact via paliad.users.
    sender_id            uuid          NOT NULL REFERENCES paliad.users(id),

    -- Optional template the sender started from. NULL when freeform.
    template_key         text,

    -- Snapshot of filter chips selected at send time. Keys: project_ids
    -- (uuid[]), offices (text[]), roles (text[]). jsonb for forward-compat.
    recipient_filter     jsonb         NOT NULL DEFAULT '{}'::jsonb,

    -- Resolved addressee list — the user_ids that received (or attempted)
    -- the mail. Immune to subsequent team-membership changes.
    recipient_user_ids   uuid[]        NOT NULL DEFAULT '{}'::uuid[],

    -- Per-send result counts (sent, failed, total). jsonb so we can grow
    -- the report shape without a migration.
    send_report          jsonb         NOT NULL DEFAULT '{}'::jsonb,

    sent_at              timestamptz   NOT NULL DEFAULT now(),
    created_at           timestamptz   NOT NULL DEFAULT now()
);

-- ============================================================================
-- 2. Indexes
-- ============================================================================

CREATE INDEX email_broadcasts_sent_at_idx
    ON paliad.email_broadcasts (sent_at DESC);

CREATE INDEX email_broadcasts_sender_idx
    ON paliad.email_broadcasts (sender_id, sent_at DESC);

-- ============================================================================
-- 3. RLS
-- ============================================================================

ALTER TABLE paliad.email_broadcasts ENABLE ROW LEVEL SECURITY;

-- Senders can read their own rows; global_admin can read everything.
-- The Go service layer (BroadcastService) is the load-bearing gate; RLS
-- here is defence-in-depth for any future auth-context query path.
CREATE POLICY email_broadcasts_select
    ON paliad.email_broadcasts FOR SELECT
    USING (
        sender_id = auth.uid()
        OR EXISTS (
            SELECT 1 FROM paliad.users u
             WHERE u.id = auth.uid()
               AND u.global_role = 'global_admin'
        )
    );

-- Inserts only by the sender themselves (defence-in-depth — the service
-- enforces project_lead-OR-global_admin authorship; RLS only enforces the
-- self-attribution bit).
CREATE POLICY email_broadcasts_insert
    ON paliad.email_broadcasts FOR INSERT
    WITH CHECK (sender_id = auth.uid());