-- +goose Up
CREATE TABLE procurement_requests (
    id TEXT PRIMARY KEY NOT NULL CHECK (length(id) = 36),
    creator_subject TEXT NOT NULL,
    freight_order_item_id TEXT NOT NULL
        REFERENCES freight_order_items(id)
            ON UPDATE RESTRICT ON DELETE RESTRICT,
    source_revision INTEGER NOT NULL CHECK (source_revision >= 1),
    source_sha256 TEXT NOT NULL
        CHECK (
            length(source_sha256) = 64
            AND source_sha256 NOT GLOB '*[^0-9a-f]*'
        ),
    title TEXT NOT NULL
        CHECK (length(CAST(title AS BLOB)) <= 2048),
    product_spec TEXT NOT NULL
        CHECK (length(CAST(product_spec AS BLOB)) <= 1024),
    sku TEXT NOT NULL
        CHECK (length(CAST(sku AS BLOB)) <= 512),
    quantity INTEGER CHECK (quantity IS NULL OR quantity > 0),
    source_purchase_status TEXT
        CHECK (
            source_purchase_status IS NULL
            OR length(CAST(source_purchase_status AS BLOB)) <= 128
        ),
    source_is_canceled INTEGER
        CHECK (
            source_is_canceled IS NULL
            OR source_is_canceled IN (0, 1)
        ),
    procurement_confirmed_by_user_id TEXT NOT NULL
        REFERENCES users(id) ON UPDATE RESTRICT ON DELETE RESTRICT,
    procurement_confirmed_at TEXT NOT NULL,
    status TEXT NOT NULL
        CHECK (
            status IN (
                'BLOCKED',
                'NEEDS_IMAGE',
                'READY',
                'TASK_CREATED',
                'SOURCE_CHANGED'
            )
        ),
    blocking_code TEXT
        CHECK (
            blocking_code IS NULL
            OR blocking_code IN (
                'SOURCE_CANCELED',
                'TITLE_REQUIRED',
                'SKU_REQUIRED',
                'QUANTITY_REQUIRED',
                'SOURCE_CHANGED'
            )
        ),
    reference_asset_id TEXT UNIQUE
        REFERENCES assets(id) ON UPDATE RESTRICT ON DELETE RESTRICT,
    purchase_task_id TEXT UNIQUE
        REFERENCES purchase_tasks(id)
            ON UPDATE RESTRICT ON DELETE RESTRICT,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL,
    UNIQUE (freight_order_item_id, source_revision),
    CHECK (
        (status = 'BLOCKED'
            AND blocking_code IS NOT NULL
            AND reference_asset_id IS NULL
            AND purchase_task_id IS NULL)
        OR (status = 'NEEDS_IMAGE'
            AND blocking_code IS NULL
            AND reference_asset_id IS NULL
            AND purchase_task_id IS NULL)
        OR (status = 'READY'
            AND blocking_code IS NULL
            AND reference_asset_id IS NOT NULL
            AND purchase_task_id IS NULL)
        OR (status = 'TASK_CREATED'
            AND blocking_code IS NULL
            AND reference_asset_id IS NOT NULL
            AND purchase_task_id IS NOT NULL)
        OR (status = 'SOURCE_CHANGED'
            AND blocking_code = 'SOURCE_CHANGED'
            AND purchase_task_id IS NULL)
    )
);

CREATE INDEX procurement_requests_creator_updated_idx
    ON procurement_requests (creator_subject, updated_at DESC, id DESC);

CREATE INDEX procurement_requests_item_created_idx
    ON procurement_requests (
        freight_order_item_id,
        source_revision DESC,
        id DESC
    );

CREATE TABLE purchase_task_sources (
    task_id TEXT PRIMARY KEY NOT NULL
        REFERENCES purchase_tasks(id)
            ON UPDATE RESTRICT ON DELETE RESTRICT,
    procurement_request_id TEXT NOT NULL UNIQUE
        REFERENCES procurement_requests(id)
            ON UPDATE RESTRICT ON DELETE RESTRICT,
    freight_order_item_id TEXT NOT NULL
        REFERENCES freight_order_items(id)
            ON UPDATE RESTRICT ON DELETE RESTRICT,
    source_revision INTEGER NOT NULL CHECK (source_revision >= 1),
    source_sha256 TEXT NOT NULL
        CHECK (
            length(source_sha256) = 64
            AND source_sha256 NOT GLOB '*[^0-9a-f]*'
        ),
    created_at TEXT NOT NULL
);

-- +goose Down
CREATE TEMP TABLE procurement_v13_down_guard (
    allowed INTEGER NOT NULL CHECK (allowed = 1)
);

INSERT INTO procurement_v13_down_guard (allowed)
SELECT CASE
    WHEN EXISTS (SELECT 1 FROM procurement_requests)
      OR EXISTS (SELECT 1 FROM purchase_task_sources)
    THEN 0
    ELSE 1
END;

DROP TABLE procurement_v13_down_guard;
DROP TABLE purchase_task_sources;
DROP INDEX procurement_requests_item_created_idx;
DROP INDEX procurement_requests_creator_updated_idx;
DROP TABLE procurement_requests;