If I buy a Mac in Singapore will the warranty coverage be available in Indonesia?

Depends on what you mean by a "Mac". If you read the fine print in Apple's Worldwide Warranty terms, they say that as long as it's a portable device (i.e. battery powered) it has a worldwide warranty for 1 year. However, any device that has a cellular antenna (like an iPhone) doesn't qualify. They may have limitations in terms of ordering parts though, if there's anything like a different keyboard layout or accessories in the box. Mostly I'm thinking if there are different "duckheads" on the power adapter.

https://store.apple.com/Catalog/Images/worldwidewarranty.html

If the product is portable, meaning that it can operate independently without a power cord, you may obtain warranty service worldwide. However, service will be limited to the options available in the country where service is requested. If the product is not portable, warranty service may be restricted to the country where the product is purchased. Service options, parts availability and response times will vary according to country. You may be responsible for shipping and handling charges if the product cannot be serviced in the country it is in. In accordance with applicable law, Apple may require that you furnish proof of purchase details and/or comply with registration requirements before receiving warranty service.

https://www.apple.com/legal/warranty/ - select item then country then language

I believe the warranties on computers are international but check the documentation above.

Yes.

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