-- Email Agent schema (AGENTS.md §7).
--
-- Every statement is idempotent (CREATE ... IF NOT EXISTS) so this file can be
-- executed on every start. Retention/capping jobs belong to later phases.
--
-- Attribution: created for the Email Agent Phase 1 skeleton.

PRAGMA foreign_keys = ON;

-- Records the applied schema version for future migrations.
CREATE TABLE IF NOT EXISTS schema_migrations (
    version     INTEGER PRIMARY KEY,
    applied_at  TEXT NOT NULL DEFAULT (datetime('now'))
);

-- FR-1, FR-2: mail metadata and body, plus the forwarding address it arrived at.
CREATE TABLE IF NOT EXISTS messages (
    id              INTEGER PRIMARY KEY AUTOINCREMENT,
    gmail_id        TEXT    NOT NULL UNIQUE,
    thread_id       TEXT,
    from_addr       TEXT,
    to_addr         TEXT,
    subject         TEXT,
    body_text       TEXT,
    source_address  TEXT,
    date_sent       TEXT,
    -- IMAP bookkeeping (AGENTS.md §9): the mailbox UID and the UIDVALIDITY it
    -- belongs to. UIDs are only meaningful while UIDVALIDITY is unchanged.
    imap_uid            INTEGER,
    imap_uidvalidity    INTEGER,
    received_at     TEXT    NOT NULL DEFAULT (datetime('now')),
    created_at      TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_messages_received_at ON messages (received_at);
CREATE INDEX IF NOT EXISTS idx_messages_thread_id   ON messages (thread_id);
CREATE INDEX IF NOT EXISTS idx_messages_source      ON messages (source_address);

-- FR-14: the editable category list. `name` is the stable key stored in
-- classifications.category and sent to JEV as the Choice option name. Renaming a
-- category cascades to existing classifications (see store.RenameCategory).
CREATE TABLE IF NOT EXISTS categories (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    name        TEXT    NOT NULL COLLATE NOCASE UNIQUE,
    description TEXT    NOT NULL DEFAULT '',
    position    INTEGER NOT NULL DEFAULT 0,
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_categories_position ON categories (position, name);

-- FR-3, FR-14: classifier output per message.
CREATE TABLE IF NOT EXISTS classifications (
    id           INTEGER PRIMARY KEY AUTOINCREMENT,
    message_id   INTEGER NOT NULL REFERENCES messages (id) ON DELETE CASCADE,
    category     TEXT    NOT NULL,
    importance   TEXT,
    action       TEXT,
    confidence   REAL,
    model        TEXT,
    created_at   TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_classifications_message ON classifications (message_id);

-- FR-4, FR-11: versioned rules text.
CREATE TABLE IF NOT EXISTS rules (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    text        TEXT    NOT NULL,
    version     INTEGER NOT NULL,
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

-- FR-13: append-only action log.
CREATE TABLE IF NOT EXISTS actions_log (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    message_id  INTEGER REFERENCES messages (id) ON DELETE SET NULL,
    action      TEXT    NOT NULL,
    actor       TEXT,
    rule_id     INTEGER REFERENCES rules (id) ON DELETE SET NULL,
    detail      TEXT,
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_actions_log_message ON actions_log (message_id);
CREATE INDEX IF NOT EXISTS idx_actions_log_created ON actions_log (created_at);

-- FR-7: unsubscribe tracker and ignore list.
CREATE TABLE IF NOT EXISTS unsubscribe (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    domain      TEXT    NOT NULL UNIQUE,
    status      TEXT    NOT NULL DEFAULT 'done' CHECK (status IN ('done', 'ignored')),
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

-- FR-8: reply drafts.
CREATE TABLE IF NOT EXISTS drafts (
    id           INTEGER PRIMARY KEY AUTOINCREMENT,
    message_id   INTEGER NOT NULL REFERENCES messages (id) ON DELETE CASCADE,
    body         TEXT    NOT NULL,
    template_id  TEXT,
    status       TEXT    NOT NULL DEFAULT 'draft',
    created_at   TEXT    NOT NULL DEFAULT (datetime('now')),
    updated_at   TEXT    NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_drafts_message ON drafts (message_id);

-- FR-10: daily summary and its delivery target.
CREATE TABLE IF NOT EXISTS summaries (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    date          TEXT    NOT NULL UNIQUE,
    text          TEXT    NOT NULL,
    delivered_to  TEXT,
    created_at    TEXT    NOT NULL DEFAULT (datetime('now'))
);

INSERT OR IGNORE INTO schema_migrations (version) VALUES (1);