package stream

import (
	"errors"
	"net"
	"strings"
	"testing"
)

func TestClassifyError_TimeoutIsTransient(t *testing.T) {
	info := ClassifyError(errors.New("context deadline exceeded"), "dialogue_generating", "req_1", "sess_1", "")
	if info.Class != ErrorClassTransient {
		t.Fatalf("class=%s", info.Class)
	}
	if info.Code != "CHAT_TIMEOUT" && info.Code != "TRANSIENT_ERROR" {
		// Accept either stable code chosen in implementation; prefer CHAT_TIMEOUT when message contains timeout/deadline
		t.Fatalf("code=%s", info.Code)
	}
	if len(info.Actions) != 1 || info.Actions[0] != "retry" {
		t.Fatalf("actions=%v", info.Actions)
	}
	if info.RequestID != "req_1" || info.PhaseID != "dialogue_generating" {
		t.Fatalf("meta=%+v", info)
	}
}

func TestClassifyError_DoesNotLeakSQL(t *testing.T) {
	info := ClassifyError(errors.New("pq: password authentication failed /home/weichen/x"), "dialogue_generating", "req_x", "sess_1", "")
	if strings.Contains(info.Upstream, "pq:") || strings.Contains(info.Upstream, "/home/") || strings.Contains(info.UserMessage, "pq:") {
		t.Fatalf("%+v", info)
	}
	if info.Message != info.UserMessage {
		t.Fatal("message alias")
	}
}

func TestClassifyError_GenericIsFatal(t *testing.T) {
	info := ClassifyError(errors.New("invalid project config"), "intent_recognizing", "req_2", "sess_1", "")
	if info.Class != ErrorClassFatal {
		t.Fatalf("class=%s", info.Class)
	}
	hasRestart := false
	for _, a := range info.Actions {
		if a == "restart" {
			hasRestart = true
		}
	}
	if !hasRestart {
		t.Fatalf("expected restart action, got %v", info.Actions)
	}
}

func TestClassifyError_WorkspaceHintIsResumable(t *testing.T) {
	info := ClassifyError(errors.New("step failed mid-run"), "step_executing", "req_3", "sess_1", "research_123")
	if info.Class != ErrorClassResumable {
		t.Fatalf("class=%s", info.Class)
	}
	hasContinue := false
	hasRestart := false
	for _, a := range info.Actions {
		if a == "continue" {
			hasContinue = true
		}
		if a == "restart" {
			hasRestart = true
		}
	}
	if !hasContinue {
		t.Fatalf("expected continue, got %v", info.Actions)
	}
	if !hasRestart {
		t.Fatalf("expected restart, got %v", info.Actions)
	}
}

func TestClassifyError_DialogueNotNetwork(t *testing.T) {
	info := ClassifyError(errors.New("dialogue generation failed"), "dialogue_generating", "req_5", "sess_1", "")
	if info.Class == ErrorClassTransient {
		t.Fatalf("dialogue substring must not classify as transient/network, class=%s code=%s", info.Class, info.Code)
	}
	if info.Class != ErrorClassFatal {
		t.Fatalf("class=%s", info.Class)
	}
}

func TestClassifyError_NetworkIsTransient(t *testing.T) {
	info := ClassifyError(&net.OpError{Op: "dial", Err: errors.New("connection refused")}, "dialogue_generating", "req_4", "sess_1", "")
	if info.Class != ErrorClassTransient {
		t.Fatalf("class=%s", info.Class)
	}
}

func TestClassifyError_DocumentBusyIsVisibleStateWithoutRetry(t *testing.T) {
	info := ClassifyError(errors.New("文档正在被 squad(run_1) 编辑中，禁止并行修改"), "", "req_busy", "sess_1", "")
	if info.Code != "DOC_BUSY" {
		t.Fatalf("code=%s", info.Code)
	}
	if len(info.Actions) != 0 {
		t.Fatalf("busy state must not encourage duplicate retry, actions=%v", info.Actions)
	}
}

func TestClassifyError_DocumentLedgerFKIsLedgerError(t *testing.T) {
	err := errors.New(`persist document ledger: ERROR: insert or update on table "document_records" violates foreign key constraint "document_records_reviewer_id_fkey" (SQLSTATE 23503)`)
	info := ClassifyError(err, "", "run_1", "sess-p6417-u9", "")
	if info.Code != "DOC_LEDGER_ERROR" {
		t.Fatalf("code=%s", info.Code)
	}
	if info.Class != ErrorClassFatal {
		t.Fatalf("class=%s", info.Class)
	}
	if len(info.Actions) != 1 || info.Actions[0] != "restart" {
		t.Fatalf("actions=%v", info.Actions)
	}
	if !strings.Contains(info.UserMessage, "文档职责账本") {
		t.Fatalf("user_message=%q", info.UserMessage)
	}
	// SQL detail must not leak into user-facing fields (Upstream may be stripped by leak filter).
	if strings.Contains(info.UserMessage, "SQLSTATE") || strings.Contains(info.UserMessage, "foreign key") {
		t.Fatalf("user message leaked SQL: %q", info.UserMessage)
	}
}