defmodule DaProductApp.Partners.Partner do
  @moduledoc """
  Partner schema representing merchant acquirers/aggregators.
  
  Partners are entities that:
  - Enroll merchants under them
  - Generate QR codes for merchants  
  - Handle merchant settlements
  - Provide merchant services
  """
  use Ecto.Schema
  import Ecto.Changeset

  @primary_key {:id, :binary_id, autogenerate: true}
  @foreign_key_type :binary_id

  schema "partners" do
    field :partner_code, :string           # Unique partner identifier (e.g., "RAZORPAY", "PAYU")
    field :partner_name, :string           # Display name (e.g., "Razorpay Business")
    field :partner_type, :string           # "AGGREGATOR", "ACQUIRER", "PROCESSOR"
    field :api_endpoint, :string           # Partner's API base URL
    field :api_key, :string               # Partner API key for PSP authentication (new)
    field :api_secret, :string            # Partner API secret (encrypted)
    field :webhook_url, :string           # Partner's webhook for callbacks
    field :webhook_secret, :string        # Webhook signature verification
    field :settlement_account, :string    # Partner's settlement account details
    field :commission_rate, :decimal      # Commission % charged by partner
    field :status, :string, default: "ACTIVE"  # "ACTIVE", "SUSPENDED", "INACTIVE"
    field :contact_email, :string
    field :contact_phone, :string
    field :corridor, :string              # International corridor: "SINGAPORE", "UAE", "USA", "DOMESTIC"
    field :base_currency, :string         # Partner's base currency: "SGD", "AED", "USD", "INR"
    field :ip_whitelist, :string          # JSON array of allowed IPs
    field :rate_limit_per_minute, :integer, default: 100
    field :last_used_at, :utc_datetime
    field :api_key_expires_at, :utc_datetime
    field :onboarded_at, :utc_datetime
    field :last_reconciled_at, :utc_datetime

    has_many :merchants, DaProductApp.Partners.Merchant
    has_many :transactions, DaProductApp.Transactions.Transaction

    timestamps(type: :utc_datetime)
  end

  def changeset(partner, attrs) do
    partner
    |> cast(attrs, [
      :partner_code, :partner_name, :partner_type, :api_endpoint, 
      :api_key, :api_secret, :webhook_url, :webhook_secret, :settlement_account,
      :commission_rate, :status, :contact_email, :contact_phone,
      :corridor, :base_currency, :ip_whitelist, :rate_limit_per_minute,
      :last_used_at, :api_key_expires_at, :onboarded_at, :last_reconciled_at
    ])
    |> validate_required([:partner_code, :partner_name, :partner_type])
    |> validate_inclusion(:partner_type, ["AGGREGATOR", "ACQUIRER", "PROCESSOR"])
    |> validate_inclusion(:status, ["ACTIVE", "SUSPENDED", "INACTIVE"])
    |> validate_inclusion(:corridor, ["SINGAPORE", "UAE", "USA", "DOMESTIC"])
    |> validate_inclusion(:base_currency, ["SGD", "AED", "USD", "INR"])
    |> validate_format(:contact_email, ~r/@/)
    |> validate_number(:rate_limit_per_minute, greater_than: 0, less_than: 10000)
    |> unique_constraint(:partner_code)
    |> unique_constraint(:api_key)
  end

  @doc """
  Changeset for API key generation/rotation
  """
  def api_key_changeset(partner, attrs) do
    partner
    |> cast(attrs, [:api_key, :api_secret, :api_key_expires_at, :status])
    |> validate_required([:api_key, :api_secret])
    |> unique_constraint(:api_key)
  end
end