"""SQLite 数据库结构和迁移定义。

每个版本对应一组按顺序执行的 SQL。新增数据库版本时，只能在
``MIGRATIONS`` 末尾增加版本，不能修改已经发布的迁移。
"""

SCHEMA_VERSION = 5


MIGRATION_1 = (
    """
    CREATE TABLE pdd_tasks (
        id                  INTEGER PRIMARY KEY AUTOINCREMENT,
        remote_task_id      TEXT NOT NULL UNIQUE,
        task_type           TEXT NOT NULL
                             CHECK (task_type IN ('collect', 'purchase')),
        goods_id            TEXT,
        goods_url           TEXT NOT NULL,
        title               TEXT,
        target_color        TEXT,
        target_size         TEXT,
        price_cent          INTEGER
                             CHECK (price_cent IS NULL OR price_cent >= 0),
        quantity            INTEGER
                             CHECK (quantity IS NULL OR quantity > 0),
        status              TEXT NOT NULL DEFAULT 'claimed'
                             CHECK (status IN (
                                 'claimed', 'running',
                                 'result_pending', 'retry_wait',
                                 'manual_review', 'succeeded',
                                 'failed', 'cancelled'
                             )),
        current_step        TEXT,
        priority            INTEGER NOT NULL DEFAULT 0,
        version             INTEGER NOT NULL DEFAULT 1 CHECK (version > 0),
        admin_payload       TEXT NOT NULL DEFAULT '{}',
        pdd_data            TEXT,
        retry_count         INTEGER NOT NULL DEFAULT 0 CHECK (retry_count >= 0),
        last_error_code     TEXT,
        last_error_message  TEXT,
        received_at         TEXT NOT NULL,
        started_at          TEXT,
        finished_at         TEXT,
        created_at          TEXT NOT NULL,
        updated_at          TEXT NOT NULL
    )
    """,
    """
    CREATE INDEX idx_pdd_tasks_list
        ON pdd_tasks(updated_at DESC, id DESC)
    """,
    """
    CREATE INDEX idx_pdd_tasks_status_type
        ON pdd_tasks(status, task_type)
    """,
    """
    CREATE INDEX idx_pdd_tasks_goods_id
        ON pdd_tasks(goods_id)
    """,
    """
    CREATE TABLE task_runs (
        id                      INTEGER PRIMARY KEY AUTOINCREMENT,
        task_id                 INTEGER NOT NULL,
        attempt_id              TEXT NOT NULL UNIQUE,
        attempt_no              INTEGER NOT NULL CHECK (attempt_no > 0),
        device_address          TEXT NOT NULL,
        run_status              TEXT NOT NULL
                                 CHECK (run_status IN (
                                     'running', 'succeeded', 'failed',
                                     'cancelled', 'manual_review'
                                 )),
        current_step            TEXT,
        started_at              TEXT NOT NULL,
        finished_at             TEXT,
        irreversible_action_at  TEXT,
        order_submitted_at      TEXT,
        error_code              TEXT,
        error_message           TEXT,
        diagnostics_json        TEXT,
        artifact_directory      TEXT,
        created_at              TEXT NOT NULL,
        updated_at              TEXT NOT NULL,
        FOREIGN KEY (task_id) REFERENCES pdd_tasks(id) ON DELETE CASCADE,
        UNIQUE (task_id, attempt_no)
    )
    """,
    """
    CREATE INDEX idx_task_runs_task
        ON task_runs(task_id, attempt_no DESC)
    """,
    """
    CREATE TABLE outbox_events (
        id                INTEGER PRIMARY KEY AUTOINCREMENT,
        task_id           INTEGER NOT NULL,
        event_type        TEXT NOT NULL
                           CHECK (event_type IN (
                               'collect_result', 'purchase_result',
                               'task_failure'
                           )),
        idempotency_key   TEXT NOT NULL UNIQUE,
        payload_json      TEXT NOT NULL,
        status            TEXT NOT NULL DEFAULT 'pending'
                           CHECK (status IN (
                               'pending', 'sending', 'sent', 'failed'
                           )),
        attempt_count     INTEGER NOT NULL DEFAULT 0
                           CHECK (attempt_count >= 0),
        next_retry_at     TEXT,
        last_error        TEXT,
        created_at        TEXT NOT NULL,
        updated_at        TEXT NOT NULL,
        sent_at           TEXT,
        FOREIGN KEY (task_id) REFERENCES pdd_tasks(id) ON DELETE CASCADE
    )
    """,
    """
    CREATE INDEX idx_outbox_pending
        ON outbox_events(status, next_retry_at, id)
    """,
    """
    CREATE TABLE app_settings (
        setting_key  TEXT PRIMARY KEY,
        value_json   TEXT NOT NULL,
        updated_at   TEXT NOT NULL
    )
    """,
)


MIGRATION_2 = (
    """
    ALTER TABLE task_runs ADD COLUMN result_data TEXT
    """,
)


MIGRATION_3 = (
    """
    ALTER TABLE pdd_tasks ADD COLUMN execution_mode TEXT NOT NULL DEFAULT 'dry_run'
        CHECK (execution_mode IN ('dry_run', 'live'))
    """,
)


MIGRATION_4 = (
    """
    ALTER TABLE pdd_tasks ADD COLUMN removed_at TEXT
    """,
    """
    CREATE INDEX idx_pdd_tasks_visible_list
        ON pdd_tasks(removed_at, updated_at DESC, id DESC)
    """,
)

MIGRATION_5 = (
    "ALTER TABLE pdd_tasks ADD COLUMN shop_name TEXT",
    """
    UPDATE pdd_tasks
       SET shop_name = TRIM(json_extract(pdd_data, '$.shop_name'))
     WHERE pdd_data IS NOT NULL AND json_valid(pdd_data)
       AND json_type(pdd_data, '$.shop_name') = 'text'
       AND TRIM(json_extract(pdd_data, '$.shop_name')) <> ''
    """,
)


MIGRATIONS = {
    1: MIGRATION_1,
    2: MIGRATION_2,
    3: MIGRATION_3,
    4: MIGRATION_4,
    5: MIGRATION_5,
}