/**
 * Initial PokeShare schema: extends the default `users` auth collection and
 * creates `public_users`, `mycards` and `friendships` with their API rules.
 * Mirrors the production schema (pb_schema.json export).
 * Applied automatically by `pocketbase serve` on first boot.
 */
migrate((app) => {
    // --- users (auth collection): extra profile fields, self-only access ---
    const users = app.findCollectionByNameOrId("users");
    users.fields.add(
        { name: "username", type: "text", required: true, min: 3, max: 20 },
        {
            name: "theme_preference",
            type: "select",
            values: ["System", "Light", "Dark"],
            maxSelect: 1,
        },
        {
            name: "visibility",
            type: "select",
            values: ["Public", "Friends", "Private"],
            maxSelect: 1,
        },
    );
    users.indexes.push(
        "CREATE UNIQUE INDEX idx_users_username ON users (username COLLATE NOCASE)",
    );
    users.listRule = "id = @request.auth.id";
    users.viewRule = "id = @request.auth.id";
    users.updateRule = "id = @request.auth.id";
    // No public registration — accounts are created from the admin UI (/_/)
    users.createRule = null;
    app.save(users);

    // --- public_users: read-only view used by the friend search ---
    const publicUsers = new Collection({
        name: "public_users",
        type: "view",
        viewQuery: `SELECT id, username, name, visibility FROM users WHERE visibility != 'Private'`,
        listRule: '@request.auth.id != ""',
        viewRule: null,
    });
    app.save(publicUsers);

    // --- mycards: one row per owned card ---
    // listRule enforces collection visibility at the database level:
    // owner, or anyone if the owner is Public, or accepted friends if Friends.
    const mycards = new Collection({
        name: "mycards",
        type: "base",
        fields: [
            { name: "card_id", type: "text" },
            { name: "card_name", type: "text" },
            {
                name: "user",
                type: "relation",
                collectionId: "_pb_users_auth_",
                maxSelect: 1,
                cascadeDelete: true,
            },
            { name: "card_image", type: "url" },
            { name: "variant", type: "text" },
            { name: "quantity", type: "number" },
            { name: "set_name", type: "text" },
            { name: "notes", type: "text" },
            { name: "condition", type: "text" },
        ],
        listRule:
            "@request.auth.id = user || (user.visibility = 'Public') || (user.visibility = 'Friends' && ((@collection.friendships.requester = user && @collection.friendships.addressee = @request.auth.id && @collection.friendships.status = 'accepted') || (@collection.friendships.addressee = user && @collection.friendships.requester = @request.auth.id && @collection.friendships.status = 'accepted')))",
        viewRule:
            "@request.auth.id = user || (@collection.friendships.requester = user && @collection.friendships.addressee = @request.auth.id && @collection.friendships.status = 'accepted') || (@collection.friendships.addressee = user && @collection.friendships.requester = @request.auth.id && @collection.friendships.status = 'accepted')",
        createRule: '@request.auth.id != "" && user = @request.auth.id',
        updateRule: '@request.auth.id != "" && user = @request.auth.id',
        deleteRule: '@request.auth.id != "" && user = @request.auth.id',
    });
    app.save(mycards);

    // --- friendships ---
    const friendships = new Collection({
        name: "friendships",
        type: "base",
        fields: [
            {
                name: "requester",
                type: "relation",
                collectionId: "_pb_users_auth_",
                maxSelect: 1,
                cascadeDelete: true,
            },
            {
                name: "addressee",
                type: "relation",
                collectionId: "_pb_users_auth_",
                maxSelect: 1,
                cascadeDelete: true,
            },
            {
                name: "status",
                type: "select",
                values: ["accepted", "pending", "declined"],
                maxSelect: 1,
            },
        ],
        listRule: "@request.auth.id = requester || @request.auth.id = addressee",
        viewRule: "@request.auth.id = requester || @request.auth.id = addressee",
        createRule: "@request.auth.id = requester && addressee != requester",
        updateRule: "@request.auth.id = addressee || @request.auth.id = requester",
        deleteRule: "@request.auth.id = addressee || @request.auth.id = requester",
    });
    app.save(friendships);
}, (app) => {
    // Down: drop the custom collections. The added `users` fields are left in
    // place — removing them would destroy data and they are harmless.
    for (const name of ["friendships", "mycards", "public_users"]) {
        try {
            app.delete(app.findCollectionByNameOrId(name));
        } catch {
            // already missing
        }
    }
});