syntax = "proto3";

package ledger.v1;

option go_package = "github.com/tech/sendico/pkg/proto/ledger/v1;ledgerv1";

import "google/protobuf/timestamp.proto";
import "common/money/v1/money.proto";

// ===== Enums =====

enum EntryType {
  ENTRY_TYPE_UNSPECIFIED = 0;
  ENTRY_CREDIT   = 1;
  ENTRY_DEBIT    = 2;
  ENTRY_TRANSFER = 3;
  ENTRY_FX       = 4;
  ENTRY_FEE      = 5;
  ENTRY_ADJUST   = 6;
  ENTRY_REVERSE  = 7;
}

enum LineType {
  LINE_TYPE_UNSPECIFIED = 0;
  LINE_MAIN     = 1;
  LINE_FEE      = 2;
  LINE_SPREAD   = 3;
  LINE_REVERSAL = 4;
}

enum AccountType {
  ACCOUNT_TYPE_UNSPECIFIED = 0;
  ACCOUNT_TYPE_ASSET       = 1;
  ACCOUNT_TYPE_LIABILITY   = 2;
  ACCOUNT_TYPE_REVENUE     = 3;
  ACCOUNT_TYPE_EXPENSE     = 4;
}

enum AccountStatus {
  ACCOUNT_STATUS_UNSPECIFIED = 0;
  ACCOUNT_STATUS_ACTIVE      = 1;
  ACCOUNT_STATUS_FROZEN      = 2;
}

// LedgerAccount captures the canonical representation of an account resource.
message LedgerAccount {
  string ledger_account_ref          = 1;
  string organization_ref            = 2;
  string account_code                = 3;
  AccountType account_type           = 4;
  string currency                    = 5;
  AccountStatus status               = 6;
  bool allow_negative                = 7;
  bool is_settlement                 = 8;
  map<string, string> metadata       = 9;
  google.protobuf.Timestamp created_at = 10;
  google.protobuf.Timestamp updated_at = 11;
}

// A single posting line (mirrors your PostingLine model)
message PostingLine {
  string  ledger_account_ref = 1;
  common.money.v1.Money   money = 2;
  LineType line_type         = 3; // MAIN, FEE, SPREAD, ...
}

// ===== Requests/Responses =====

message CreateAccountRequest {
  string organization_ref = 1;
  string account_code     = 2;
  AccountType account_type = 3;
  string currency         = 4;
  AccountStatus status    = 5;
  bool allow_negative     = 6;
  bool is_settlement      = 7;
  map<string, string> metadata = 8;
}

message CreateAccountResponse {
  LedgerAccount account = 1;
}

// Common: optional event_time lets caller set business time; server may default to now.
message PostCreditRequest {
  string idempotency_key           = 1;
  string organization_ref          = 2; // aligns with PermissionBound
  string ledger_account_ref        = 3;
  common.money.v1.Money  money     = 4;
  string description               = 5;
  repeated PostingLine charges     = 6; // FEE/SPREAD lines (no MAIN here)
  map<string, string> metadata     = 7;
  google.protobuf.Timestamp event_time = 8;
  string contra_ledger_account_ref = 9; // optional override for settlement/contra account
}

message PostDebitRequest {
  string idempotency_key           = 1;
  string organization_ref          = 2;
  string ledger_account_ref        = 3;
  common.money.v1.Money  money     = 4;
  string description               = 5;
  repeated PostingLine charges     = 6; // FEE/SPREAD
  map<string, string> metadata     = 7;
  google.protobuf.Timestamp event_time = 8;
  string contra_ledger_account_ref = 9; // optional override for settlement/contra account
}

message TransferRequest {
  string idempotency_key           = 1;
  string organization_ref          = 2;
  string from_ledger_account_ref   = 3;
  string to_ledger_account_ref     = 4;
  common.money.v1.Money  money     = 5; // transfer amount/currency
  string description               = 6;
  repeated PostingLine charges     = 7; // optional FEE/SPREAD lines
  map<string, string> metadata     = 8;
  google.protobuf.Timestamp event_time = 9;
}

message FXRequest {
  string idempotency_key           = 1;
  string organization_ref          = 2;
  string from_ledger_account_ref   = 3;
  string to_ledger_account_ref     = 4;

  common.money.v1.Money  from_money = 5;  // debited
  common.money.v1.Money  to_money   = 6;  // credited
  string rate                      = 7;  // quoted rate as string (snapshot for audit)

  string description               = 8;
  repeated PostingLine charges     = 9;  // FEE/SPREAD lines
  map<string, string> metadata     = 10;
  google.protobuf.Timestamp event_time = 11;
}

message PostResponse {
  string journal_entry_ref = 1;
  int64  version           = 2; // ledger's entry version (monotonic per scope)
  EntryType entry_type     = 3;
}

// ---- Balances & Entries ----

message GetBalanceRequest {
  string ledger_account_ref = 1;
}

message BalanceResponse {
  string ledger_account_ref          = 1;
  common.money.v1.Money  balance     = 2;
  int64  version                     = 3;
  google.protobuf.Timestamp last_updated = 4;
}

message GetEntryRequest {
  string entry_ref = 1;
}

message JournalEntryResponse {
  string entry_ref                       = 1;
  string idempotency_key                 = 2;
  EntryType entry_type                   = 3;
  string description                     = 4;
  google.protobuf.Timestamp event_time   = 5;
  int64  version                         = 6;
  repeated PostingLine lines             = 7;
  map<string, string> metadata           = 8;
  repeated string ledger_account_refs    = 9; // denormalized set for client-side filtering
}

message GetStatementRequest {
  string ledger_account_ref = 1;
  string cursor             = 2; // opaque
  int32  limit              = 3; // page size
}

message StatementResponse {
  repeated JournalEntryResponse entries = 1;
  string next_cursor                    = 2;
}

message ListAccountsRequest {
  string organization_ref = 1;
}

message ListAccountsResponse {
  repeated LedgerAccount accounts = 1;
}