syntax = "proto3";
package komp_ac.accounting;

// Mutable informational journals. A journal may contain only debits, only
// credits, or any non-zero balance. Balance is reported but never enforced.
// Accounting periods close date ranges inside a profile and freeze account sums
// without replacing the live accounts projection. Closed periods can be reopened;
// approved periods are final.
service Accounting {
  // Create a journal with its first lines when journal_id is absent, or append
  // all supplied lines atomically when journal_id identifies an existing one.
  rpc PostJournal(PostJournalRequest) returns (Journal);

  // Close a balanced journal. Closed journals can be reopened while their
  // accounting period is open.
  rpc CloseJournal(CloseJournalRequest) returns (Journal);
  rpc ReopenJournal(ReopenJournalRequest) returns (Journal);

  // Return journal lines and credits-minus-debits informational balance.
  rpc GetJournal(GetJournalRequest) returns (Journal);

  // Search profile journals by user-facing name while retaining journal ids
  // as the stable relationship keys.
  rpc SearchJournals(SearchJournalsRequest) returns (SearchJournalsResponse);

  // Return the profile-wide count of balanced and unbalanced journals.
  rpc GetAccountingStatus(GetAccountingStatusRequest) returns (AccountingStatus);

  // Return an oldest-first, paginated queue of unbalanced journals.
  rpc ListUnbalancedJournals(ListUnbalancedJournalsRequest)
      returns (ListUnbalancedJournalsResponse);

  // Soft-delete one line while retaining it for audit display.
  rpc SoftDeleteJournalLine(SoftDeleteJournalLineRequest) returns (Journal);

  // Create an open accounting period for a profile. Periods may be any length
  // (month, half-year, year). Overlapping ranges for the same profile are rejected.
  rpc ConfigureAccountingPeriod(ConfigureAccountingPeriodRequest)
      returns (AccountingPeriod);

  // Closing snapshots balances and blocks mutations through the period end.
  // A closed period may be reopened; approval makes it final.
  rpc CloseAccountingPeriod(CloseAccountingPeriodRequest) returns (AccountingPeriod);
  rpc ReopenAccountingPeriod(ReopenAccountingPeriodRequest) returns (AccountingPeriod);
  rpc ApproveAccountingPeriod(ApproveAccountingPeriodRequest) returns (AccountingPeriod);

  rpc GetAccountingPeriod(GetAccountingPeriodRequest) returns (AccountingPeriod);
  rpc ListAccountingPeriods(ListAccountingPeriodsRequest)
      returns (ListAccountingPeriodsResponse);
  rpc ListPeriodBalances(ListPeriodBalancesRequest) returns (ListPeriodBalancesResponse);
}

enum JournalSide {
  JOURNAL_SIDE_UNSPECIFIED = 0;
  JOURNAL_SIDE_DEBIT = 1;
  JOURNAL_SIDE_CREDIT = 2;
}

enum AccountingPeriodStatus {
  ACCOUNTING_PERIOD_STATUS_UNSPECIFIED = 0;
  ACCOUNTING_PERIOD_STATUS_OPEN = 1;
  ACCOUNTING_PERIOD_STATUS_CLOSED = 2;
  ACCOUNTING_PERIOD_STATUS_APPROVED = 3;
}

message PostJournalRequest {
  string profile_name = 1;

  // Absent creates a new journal. Present must identify an existing journal;
  // an unknown id is never treated as a request to create one.
  optional int64 journal_id = 2;

  // Required when creating. When appending, empty uses the journal currency;
  // a supplied value must match it exactly.
  string currency = 3;

  // Applied when creating and required to be empty when appending.
  string description = 4;

  // At least one line is required. The lines are inserted atomically and the
  // journal is allowed to remain unbalanced.
  repeated JournalLineInput lines = 5;

  // Required, unique within the profile, and at most 10 characters when
  // creating. Must be empty when appending to an existing journal selected by
  // journal_id.
  string journal_name = 6;

  // Accounting date in YYYY-MM-DD. Empty defaults to the current UTC date when
  // creating. Must be empty when appending. Rejected when it falls at or before
  // the latest closed or approved accounting boundary for the profile.
  string accounting_date = 7;
}

message JournalLineInput {
  JournalSide side = 1;
  string account_code = 2;
  string amount = 3;
  string description = 4;
}

message CloseJournalRequest {
  string profile_name = 1;
  int64 journal_id = 2;
}

message ReopenJournalRequest {
  string profile_name = 1;
  int64 journal_id = 2;
}

message GetJournalRequest {
  string profile_name = 1;
  int64 journal_id = 2;

  // False by default. True is reserved for a future Casbin permission granted
  // only to superadmin and is rejected until that permission is implemented.
  bool include_deleted = 3;
}

message GetAccountingStatusRequest {
  string profile_name = 1;
}

message SearchJournalsRequest {
  string profile_name = 1;

  // Case-insensitive literal substring. Empty returns all profile journals.
  string name_query = 2;

  // Zero uses 50. The maximum is 500.
  int32 page_size = 3;

  // Opaque cursor returned by the previous response.
  string page_token = 4;
}

message JournalSummary {
  int64 journal_id = 1;
  string journal_name = 2;
  string currency = 3;
  string description = 4;
  string total_debit = 5;
  string total_credit = 6;
  string balance = 7;
  int64 active_line_count = 8;
  bool closed = 9;
  string created_at = 10;
  string accounting_date = 11;
}

message SearchJournalsResponse {
  repeated JournalSummary journals = 1;
  int64 total_count = 2;
  string next_page_token = 3;
}

message AccountingStatus {
  bool all_journals_balanced = 1;
  int64 journal_count = 2;
  int64 balanced_journal_count = 3;
  int64 unbalanced_journal_count = 4;
  string calculated_at = 5;
}

message ListUnbalancedJournalsRequest {
  string profile_name = 1;

  // Zero uses 50. The maximum is 500.
  int32 page_size = 2;

  // Opaque cursor returned by the previous response. Empty starts at the
  // oldest unbalanced journal.
  string page_token = 3;

  // Optional ISO 4217 currency filter. Empty includes every currency.
  string currency = 4;
}

message UnbalancedJournalSummary {
  int64 journal_id = 1;
  string description = 2;
  string currency = 3;
  string total_debit = 4;
  string total_credit = 5;

  // Signed credits-minus-debits difference.
  string balance = 6;

  // Side and positive amount needed to make the journal balance zero.
  JournalSide missing_side = 7;
  string missing_amount = 8;
  int64 active_line_count = 9;
  string created_at = 10;
  string journal_name = 11;
  string accounting_date = 12;
}

message ListUnbalancedJournalsResponse {
  repeated UnbalancedJournalSummary journals = 1;
  int64 total_unbalanced_count = 2;
  string next_page_token = 3;
}

message SoftDeleteJournalLineRequest {
  string profile_name = 1;
  int64 journal_id = 2;
  int64 journal_line_id = 3;
}

message JournalLine {
  int64 id = 1;
  int32 line_number = 2;
  JournalSide side = 3;
  string account_code = 4;
  string amount = 5;
  string description = 6;
  bool deleted = 7;
  string created_at = 8;
  string deleted_at = 9;
  string source_table_name = 10;
  int64 source_record_id = 11;
  int64 source_row_revision = 12;
  reserved 13;
}

message Journal {
  int64 id = 1;
  string profile_name = 2;
  string currency = 3;
  string description = 4;
  string created_at = 5;
  repeated JournalLine lines = 6;
  string total_debit = 7;
  string total_credit = 8;
  // Informational difference calculated as credits minus debits.
  string balance = 9;
  bool closed = 10;
  string closed_at = 11;
  string closed_by_user_id = 12;
  string journal_name = 13;
  string accounting_date = 14;
}

message ConfigureAccountingPeriodRequest {
  string profile_name = 1;
  // Inclusive range in YYYY-MM-DD.
  string period_start = 2;
  string period_end = 3;
  // Optional link to the preceding period in a carry chain.
  optional int64 previous_period_id = 4;
}

message CloseAccountingPeriodRequest {
  int64 period_id = 1;
}

message ReopenAccountingPeriodRequest {
  int64 period_id = 1;
}

message ApproveAccountingPeriodRequest {
  int64 period_id = 1;
}

message GetAccountingPeriodRequest {
  int64 period_id = 1;
}

message ListAccountingPeriodsRequest {
  string profile_name = 1;
}

message ListAccountingPeriodsResponse {
  repeated AccountingPeriod periods = 1;
}

message AccountingPeriod {
  int64 id = 1;
  string profile_name = 2;
  string period_start = 3;
  string period_end = 4;
  AccountingPeriodStatus status = 5;
  int64 previous_period_id = 6;
  string closed_at = 7;
  string closed_by_user_id = 8;
  string approved_at = 9;
  string approved_by_user_id = 10;
}

message ListPeriodBalancesRequest {
  int64 period_id = 1;
}

message PeriodBalance {
  int64 period_id = 1;
  string account_code = 2;
  string currency = 3;
  // Signed nets use debit-positive convention.
  string opening_balance = 4;
  string period_debit = 5;
  string period_credit = 6;
  string closing_balance = 7;
}

message ListPeriodBalancesResponse {
  repeated PeriodBalance balances = 1;
}