-- Phase 2: share links, resumable uploads, thumbnails

ALTER TABLE files ADD COLUMN has_thumbnail BOOLEAN NOT NULL DEFAULT FALSE;

-- ── Share links ───────────────────────────────────────────────────────────────
CREATE TABLE share_links (
    id             UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
    file_id        UUID        NOT NULL REFERENCES files(id) ON DELETE CASCADE,
    owner_id       UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token          TEXT        NOT NULL UNIQUE,
    password_hash  TEXT,                   -- Argon2id, NULL = no password
    expires_at     TIMESTAMPTZ,            -- NULL = never
    download_count INTEGER     NOT NULL DEFAULT 0,
    created_at     TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_share_links_token ON share_links(token);
CREATE INDEX idx_share_links_owner ON share_links(owner_id);
CREATE INDEX idx_share_links_file  ON share_links(file_id);

-- ── Resumable uploads ────────────────────────────────────────────────────────
CREATE TABLE uploads (
    id          UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
    owner_id    UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    folder_id   UUID        REFERENCES folders(id) ON DELETE SET NULL,
    filename    TEXT        NOT NULL,
    mime_type   TEXT        NOT NULL DEFAULT 'application/octet-stream',
    total_size  BIGINT      NOT NULL,
    uploaded    BIGINT      NOT NULL DEFAULT 0,
    storage_key TEXT        NOT NULL UNIQUE,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    expires_at  TIMESTAMPTZ NOT NULL DEFAULT NOW() + INTERVAL '24 hours'
);

CREATE INDEX idx_uploads_owner ON uploads(owner_id);