Add market order to the exchange

[ClemensLey]

Research

• Read this thread on building order-books in JS: https://grok.com/c/666ad877-2907-489b-a943-ee5462a7f74b
• All details can be found in this PDF, however it is not necessary to read the PDF but I would recommend to upload it to an AI and ask questions about it: https://stanford.edu/~ashlearn/RLForFinanceBook/chapter9.pdf
• We should try to use the names from the PDF as our variable names
• Do more research on order-books with an AI, using the PDF as described

Refactoring

• Clean up the current code. Use an AI and ask questions like: "Can this code be simplified without changing it's functionality", "can you spot any bugs in this code?", "can this code be made more efficient without making it harder to read". At this point the focus should be on readability, not speed. It's always good to upload the PDF with any questions to the AI.
• Re-name variables to align to the PDF
• Rename the existing forms to "Buy Limit Order" and "Sell Limit Order"

Implementation

• Add tests to the existing code

Buy Market Order

• Create a form with a field for amount and a button "Buy"
• Create test cases for the process described in the next item
• When the button is clicked and the amount is 100, we search the order book (called eatBook in the PDF) starting from the best (lowest) price until we have found the maximal number of orders <100. Lets say we found 3 orders totaling 60. We call the function that would get called if the user clicked the three buttons themselves.
• Show a modal window informing the user that they bought 60 tokens.

Sell Market Order

• Similar to above but requires one more message (todo)

Delete Orders

We have to make sure that after/when an order is matched, it's object is deleted, so that we only have to sync against active orders

Push Notifications

We have to use computer.subscribe to get push notifications about updates to the order book

Add Charts

• Add "Market Depth" Graph
• Add "Price Chart" using the new function "computer.getTXOs"

[ClemensLey]

Lets call what we have now, BuyOrder and SellOrder

Next steps:

• Add good unit tests for BuyOrder and SellOrder
• Implement and test eatBook function
• Make the interface to BuyOrder and SellOrder as similar as possible in order to get rid of the third button click. Maybe, at the end of broadcastBuyOrder, we need to use computer.query to look for txWrappers that are owned by computer and are txWrappers that refer to the current buy order. Maybe we have to call findMatchingSwapTx at end of broadcastBuyOrder. Adapt the tests.
• Implement the SellMarketOrder that mostly just calls the eatBook function
• Likewise for BuyMarketOrder
• Implement SellLimitOrder that would first call the eat book function (to see if there is an overlap with current BuyOrder) and then create a SellOrder
• Likewise for to BuyLimitOrder
• Add unit tests for all of the above
• Add the above functionality to the user interface
• Add depth chart
• Add price chart