To store interaction contexts and settings.
Use the tables:

• IC
• USER_SETTINGS

Read connection settings from system environment variable DATABASE_URL.

Use native jdbc connections without ORM and without a connection pool.

Configure automatic deployment to heroku

Make the project run as a telegram bot. Prepare it to register it in telegram with name and tokens. Pass the data from outside via program arguments.

Positive scenario

1. Stop current interaction process by removing it from the storage
2. Respond to user with question "Please, enter landlord username to send calculations to, for example @myLandlord".
3. Read the landlord user name, check if he is being subscribed to the bot, if so, store it in the user settings storage (UserSettingsDao).
4. Respond to user with a "successful" message.

Negative scenario

2. Are the same as in Positive scenario
3. Read the landlord user name, check if he is being subscribed to the bot, if he is not then throw UnknownUserNameException with the message "The user name is not subscribed on me. Please, invite him to subscribe and then I will be able to notify him about your calculations".
4. Respond to user with the error message.

Add required dependencies and configuration files.
Log files for past days should be archived in zip files or to files with higher compression if possible.
Maximum 30 log files are allowed.

Allow user to abort current interaction process and start new one by sending /new command

Goal

• Save InteractionContext to PostgreSQL database to INTERACTION_CONTEXT table to persist it between the application restarts. A single one for each chat.
• Use finished latest calculation to "prefill" next one according to the following scenarios:

Positive scenario

1. User starts a new calculation
2. Bot reads last meter readings from the table. If it has "current" readings then bot asks user "Do you want to use this readings from last calculation in this new calculation?" Also bot shows two buttons: Yes/No.
3. User taps Yes button
4. Bot uses the readings in the calculation and skips requests to enter this data.

Negative scenario

1. The same as in positive scenario
2. Bot reads last meter readings from the DB and doesn't find saved data for the chat.
3. Bot asks for the readings interactively as currently.

Requires to update pom.xml, Procfile, and /.github/workflows/codeql-analysis.yml files

Implement cold water price provider.
Use Moscow open data API (https://apidata.mos.ru/Docs)

Requests example:

POST https://apidata.mos.ru/v1/datasets?api_key=[key]&foreign=true&$filter=DepartmentId eq 181 and substringof('tariffs',Keywords) eq true

["Id"]

POST https://apidata.mos.ru/v1/datasets/61922/rows?api_key=[key]filter=Cells/TariffItem_en eq 'Heating system'

Make it following the scenario:

• User selects "new calculation"
• bot: enter cold water last meter readings
• user: enters
• bot: enter hot water current meter readings
• user: enters
• bit: repeats the same questions for hot water and electricity
• bot: parses the pages from links below, finds prices,
  for current date and calculates payment amounts.
• bot: send a message to user in following format:

Cold water:
- the price sets from 01.07.2020
- amount to pay: 3456 RUB (123L × 123 RUB/L)
Hot water:
- the price sets from 01.08.2020
- amount to pay: 3456 RUB (123L × 123 RUB/L)
Water disposal:
- the price sets from 01.09.2020
- amount to pay: 3456 RUB (345L × 123 RUB/L)
Electricity:
- the price sets from 01.10.2020
- amount to pay: 3456 RUB (123KW × 123 RUB/KW)

Instead of manual injection.

The dependency is already in classpath.

Instead of

• Mosvodokanal: http://www.mosvodokanal.ru/forabonents/tariffs/
• MOEK: https://online.moek.ru/clients/tarify-i-raschety/tarify
• Mosenergosbyt: https://www.mosenergosbyt.ru/individuals/tariffs-n-payments/tariffs-msk/kvartiry-i-doma-s-elektricheskimi-plitami.php

make the links like this:

• Mosvodokanal:
• MOEK
• Mosenergosbyt

Use Message#setEntries()

Implement electricity prices page parser.

• Price[] ColdWaterPricesProvider()
• Price[] HotWaterPricesProvider()
• Price[] ElectricityPricesProvider()

They should return Price[] array with single entry with hardcoded price for current duration