Key Accounts Wrapper

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You need to build an analysis tool that identifies key accounts across multiple industries and calculates key metrics for reporting purposes.

For this problem, we define minimum annual revenue thresholds an account must meet to be considered a key account. The annual revenue thresholds are defined by industry:

* Banking: 600,000
* Technology: 800,000
* Retail: 2,000,000
* Manufacturing: 500,000

Complete the KeyAccountWrapper and implement the analyzeKeyAccounts method in the AnnualThresholdCalculator class.

KeyAccountWrapper will need the following properties:

* A String named Industry to store the industry being analyzed
* A Set of Ids named keyAccountIds used to qualify as key accounts
* A Decimal named averageKeyAnnualRevenue to store the Average annual revenue of key accounts in this industry

Example

Input

Account a1 = new Account();
a1.Id = '001000000000001';
a1.AnnualRevenue = 750000;
a1.Industry = 'Technology';

Account a2 = new Account();  
a2.Id = '001000000000002';
a2.AnnualRevenue = 900000;
a2.Industry = 'Technology';

Account a3 = new Account();
a3.Id = '001000000000003';
a3.AnnualRevenue = 700000;
a3.Industry = 'Banking';

List<Account> accounts = new List<Account>{a1, a2, a3};
AnnualThresholdCalculator calc = new AnnualThresholdCalculator();
List<KeyAccountWrapper> results = calc.analyzeKeyAccounts(accounts);

Expected results: (2 wrappers returned in the list):

industry='Technology', keyAccountIds={a2.Id}, averageKeyAnnualRevenue=900000
industry='Banking', keyAccountIds={a3.Id}, averageKeyAnnualRevenue=700000

Notes

• If an industry has no accounts that qualify as key accounts, do not include a wrapper for that industry
  
• Handle null/empty revenue values appropriately
  
• Industry matching should be case-sensitive
  
• Return empty List if no industries have key accounts
  
• Only calculate average from accounts that actually qualify as key accounts