package server

import (
	"errors"
	"strings"
	"testing"

	"chat-agent-system/internal/coordinator"
	"chat-agent-system/internal/docgov"
	"chat-agent-system/internal/projectinstance"
	"chat-agent-system/internal/workflowscope"
)

func TestSelectReadableWorkflowDocumentMatchesInitialRequirementsAlias(t *testing.T) {
	docs := []docgov.WorkflowDocumentSummary{
		{DocID: "doc_proj143_intake", TaskKey: "intake", Title: "用户初始需求收集表"},
		{DocID: "doc_proj143_research", TaskKey: "research", Title: "技术与市场调研报告"},
	}
	doc, err := selectReadableWorkflowDocument(docs, "用户初始需求表", "", nil)
	if err != nil {
		t.Fatalf("select: %v", err)
	}
	if doc.DocID != "doc_proj143_intake" {
		t.Fatalf("doc=%s", doc.DocID)
	}
}

func TestSelectReadableWorkflowDocumentDoesNotGuessWhenTargetMissing(t *testing.T) {
	docs := []docgov.WorkflowDocumentSummary{
		{DocID: "doc_a", TaskKey: "intake", Title: "用户初始需求收集表"},
		{DocID: "doc_b", TaskKey: "research", Title: "调研报告"},
	}
	if _, err := selectReadableWorkflowDocument(docs, "", "", nil); err == nil {
		t.Fatal("expected target-required error")
	}
}

func TestSelectReadableWorkflowDocumentScopesToActiveWorkflow(t *testing.T) {
	docs := []docgov.WorkflowDocumentSummary{
		{DocID: "doc_proj1_research", TaskKey: "bd_research", Title: "调研报告"},
		{DocID: "doc_proj1_proposal", TaskKey: "rd_proposal", Title: "项目建议书"},
	}
	scope := map[string]bool{"bd_research": true, "research": true}

	doc, err := selectReadableWorkflowDocument(docs, "调研报告", "main", scope)
	if err != nil {
		t.Fatalf("in-scope select: %v", err)
	}
	if doc.TaskKey != "bd_research" {
		t.Fatalf("want bd_research, got %s", doc.TaskKey)
	}

	_, err = selectReadableWorkflowDocument(docs, "项目建议书", "main", scope)
	if err == nil {
		t.Fatal("expected wrong-workflow error")
	}
	var wrong *coordinator.ErrWrongWorkflow
	if !errors.As(err, &wrong) {
		t.Fatalf("want ErrWrongWorkflow, got %T %v", err, err)
	}
	if !strings.Contains(wrong.Message, "切换") {
		t.Fatalf("guidance should mention 切换, got %q", wrong.Message)
	}
}

func TestSelectReadableWorkflowDocumentNoScopeKeepsLegacy(t *testing.T) {
	docs := []docgov.WorkflowDocumentSummary{
		{DocID: "doc_proj1_proposal", TaskKey: "rd_proposal", Title: "项目建议书"},
	}
	doc, err := selectReadableWorkflowDocument(docs, "项目建议书", "", nil)
	if err != nil {
		t.Fatalf("legacy passthrough: %v", err)
	}
	if doc.TaskKey != "rd_proposal" {
		t.Fatalf("want rd_proposal, got %s", doc.TaskKey)
	}
}

func TestSelectReadableWeightedAllowsExactCrossRead(t *testing.T) {
	workflowscope.SetModeForTest(workflowscope.ModeWeighted)
	t.Cleanup(workflowscope.ResetModeForTest)

	docs := []docgov.WorkflowDocumentSummary{
		{DocID: "doc_proj1_research", TaskKey: "bd_research", Title: "调研报告"},
		{DocID: "doc_proj1_proposal", TaskKey: "rd_proposal", Title: "项目建议书"},
	}
	scope := map[string]bool{"bd_research": true}
	doc, err := selectReadableWorkflowDocument(docs, "项目建议书", "main", scope)
	if err != nil {
		t.Fatalf("weighted cross read: %v", err)
	}
	if doc.TaskKey != "rd_proposal" {
		t.Fatalf("want rd_proposal, got %s", doc.TaskKey)
	}

	inScope, err := selectReadableWorkflowDocument(docs, "调研报告", "main", scope)
	if err != nil || inScope.TaskKey != "bd_research" {
		t.Fatalf("in-scope still wins: %v %v", inScope, err)
	}
}

func TestCrossWorkflowTaskVisible(t *testing.T) {
	open := &projectinstance.StageAccess{
		Restricted:       true,
		ViewableTaskKeys: map[string]bool{"bd_research": true},
	}
	scope := map[string]bool{"bd_research": true, "bd_hidden": true}
	if !crossWorkflowTaskVisible(open, scope, "rd_proposal") {
		t.Fatal("foreign key should be readable when the caller can view the active instance")
	}
	if crossWorkflowTaskVisible(open, scope, "bd_hidden") {
		t.Fatal("in-scope but not viewable must be denied")
	}
	closed := &projectinstance.StageAccess{Restricted: true, ViewableTaskKeys: map[string]bool{}}
	if crossWorkflowTaskVisible(closed, scope, "rd_proposal") {
		t.Fatal("closed instance must deny cross read")
	}
	if !crossWorkflowTaskVisible(nil, scope, "rd_proposal") {
		t.Fatal("unrestricted access must allow")
	}
}