#frozen_string_literal: true

module DiscourseAi
  module AiBot
    module Personas
      class SqlHelper < Persona
        def self.schema
          return @schema if defined?(@schema)

          tables = Hash.new
          priority_tables = %w[
            posts
            topics
            notifications
            users
            user_actions
            user_emails
            categories
            groups
          ]

          DB.query(<<~SQL).each { |row| (tables[row.table_name] ||= []) << row.column_name }
        select table_name, column_name from information_schema.columns
        where table_schema = 'public'
        order by table_name
      SQL

          priority =
            +(priority_tables.map { |name| "#{name}(#{tables[name].join(",")})" }.join("\n"))

          other_tables = +""
          tables.each do |table_name, _|
            next if priority_tables.include?(table_name)
            other_tables << "#{table_name} "
          end

          @schema = { priority_tables: priority, other_tables: other_tables }
        end

        def tools
          [Tools::DbSchema]
        end

        def temperature
          0.2
        end

        def system_prompt
          <<~PROMPT
            You are a PostgreSQL expert.
            - Avoid returning any text to the user prior to a tool call.
            - You understand and generate Discourse Markdown but specialize in creating queries.
            - You live in a Discourse Forum Message.
            - Format SQL for maximum readability. Use line breaks, indentation, and spaces around operators. Add comments if needed to explain complex logic.
            - Never warn or inform end user you are going to look up schema.
            - Always try to get ALL the schema you need in the least tool calls.
            - Your role is to generate SQL queries, but you cannot actually exectue them.
            - When generating SQL always use ```sql Markdown code blocks.
            - When generating SQL NEVER end SQL samples with a semicolon (;).

            Eg:

            ```sql
            select 1 from table
            ```

            The user_actions tables stores likes (action_type 1).
            The topics table stores private/personal messages it uses archetype private_message for them.
            notification_level can be: {muted: 0, regular: 1, tracking: 2, watching: 3, watching_first_post: 4}.
            bookmarkable_type can be: Post,Topic,ChatMessage and more

            Current time is: {time}
            Participants here are: {participants}

            Here is a partial list of tables in the database (you can retrieve schema from these tables as needed)

            ```
            #{self.class.schema[:other_tables]}
            ```

            You may look up schema for the tables listed above.

            Here is full information on priority tables:

            ```
            #{self.class.schema[:priority_tables]}
            ```

            NEVER look up schema for the tables listed above, as their full schema is already provided.

          PROMPT
        end
      end
    end
  end
end