package tools

import (
	"context"
	"encoding/json"
	"testing"

	"github.com/modelcontextprotocol/go-sdk/mcp"

	"isphere-ai-bridge/internal/isphere"
	"isphere-ai-bridge/internal/msglib"
)

func TestISphereSearchGroupsToolReturnsJIDGroups(t *testing.T) {
	fake := &fakeReceiveMessagesSource{
		result: isphere.ReceiveMessagesResult{Messages: []isphere.Message{{
			ID:               "msg-group-1",
			ConversationType: "groupchat",
			SenderID:         "project-room@conference.imopenfire1-lanzhou",
			ReceiverID:       "user@imopenfire1-lanzhou",
		}}},
	}
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereGroupTools(server, fake)
	})
	defer cleanup()

	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name:      ToolNameSearchGroups,
		Arguments: map[string]any{"query": "project", "limit": 10},
	})
	if err != nil {
		t.Fatalf("call %s: %v", ToolNameSearchGroups, err)
	}
	if callResult.IsError {
		t.Fatalf("call result is error: %+v", callResult)
	}

	var decoded struct {
		OK     bool `json:"ok"`
		Groups []struct {
			GroupID     string  `json:"group_id"`
			DisplayName string  `json:"display_name"`
			MemberCount *int    `json:"member_count"`
			OwnerRef    *string `json:"owner_ref"`
			Source      string  `json:"source"`
			Confidence  float64 `json:"confidence"`
			RawRef      string  `json:"raw_ref"`
		} `json:"groups"`
		NextCursor any            `json:"next_cursor"`
		Audit      map[string]any `json:"audit"`
	}
	payload, err := json.Marshal(callResult.StructuredContent)
	if err != nil {
		t.Fatalf("marshal structured content: %v", err)
	}
	if err := json.Unmarshal(payload, &decoded); err != nil {
		t.Fatalf("decode structured content %s: %v", payload, err)
	}
	if !decoded.OK {
		t.Fatalf("ok = false in %s", payload)
	}
	if len(decoded.Groups) != 1 {
		t.Fatalf("groups = %+v, want one", decoded.Groups)
	}
	group := decoded.Groups[0]
	if group.GroupID != "project-room@conference.imopenfire1-lanzhou" || group.DisplayName != "project-room@conference.imopenfire1-lanzhou" {
		t.Fatalf("unexpected group identity: %+v", group)
	}
	if group.MemberCount != nil || group.OwnerRef != nil {
		t.Fatalf("member/owner should be unknown: %+v", group)
	}
	if group.Source != "local_readonly" || group.Confidence != 0.6 || group.RawRef != "groupchat_jid" {
		t.Fatalf("unexpected group metadata: %+v", group)
	}
	if decoded.Audit["tool"] != ToolNameSearchGroups || decoded.Audit["result"] != "ok" {
		t.Fatalf("audit = %+v", decoded.Audit)
	}
	if len(fake.queries) != 1 || fake.queries[0].Limit != 0 {
		t.Fatalf("source queries = %+v, want one unbounded receive query", fake.queries)
	}
}

func TestISphereSearchGroupsToolUsesInjectedDisplayEntities(t *testing.T) {
	fakeMessages := &fakeReceiveMessagesSource{}
	fakeDisplay := &fakeDisplayEntitySource{entities: []msglib.DisplayEntity{{
		EntityType:     msglib.EntityTypeGroups,
		SourceTable:    "TD_WorkGroupAuth",
		JID:            "project-room@conference",
		DisplayName:    "Project Room",
		Confidence:     0.9,
		MatchedColumns: []string{"GroupJID", "GroupName"},
	}}}
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereGroupToolsWithDisplayEntities(server, fakeMessages, fakeDisplay)
	})
	defer cleanup()

	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name:      ToolNameSearchGroups,
		Arguments: map[string]any{"query": "project", "limit": 5},
	})
	if err != nil {
		t.Fatalf("call %s: %v", ToolNameSearchGroups, err)
	}
	if callResult.IsError {
		t.Fatalf("call result is error: %+v", callResult)
	}

	var decoded struct {
		Groups []struct {
			GroupID     string  `json:"group_id"`
			DisplayName string  `json:"display_name"`
			Source      string  `json:"source"`
			Confidence  float64 `json:"confidence"`
			RawRef      string  `json:"raw_ref"`
		} `json:"groups"`
	}
	payload, _ := json.Marshal(callResult.StructuredContent)
	if err := json.Unmarshal(payload, &decoded); err != nil {
		t.Fatalf("decode structured content %s: %v", payload, err)
	}
	if len(decoded.Groups) != 1 {
		t.Fatalf("groups = %+v, want one", decoded.Groups)
	}
	group := decoded.Groups[0]
	if group.GroupID != "project-room@conference" || group.DisplayName != "Project Room" {
		t.Fatalf("unexpected MsgLib group identity: %+v", group)
	}
	if group.Source != "msglib_readonly" || group.Confidence != 0.9 || group.RawRef != "msglib:TD_WorkGroupAuth" {
		t.Fatalf("unexpected MsgLib group metadata: %+v", group)
	}
	if len(fakeDisplay.queries) != 1 || fakeDisplay.queries[0].EntityType != msglib.EntityTypeGroups || fakeDisplay.queries[0].Query != "project" || fakeDisplay.queries[0].Limit != 5 {
		t.Fatalf("display queries = %+v", fakeDisplay.queries)
	}
}

func TestISphereSearchGroupsToolRanksExactAndDeduplicatesDisplayEntities(t *testing.T) {
	fakeMessages := &fakeReceiveMessagesSource{
		result: isphere.ReceiveMessagesResult{Messages: []isphere.Message{{
			ID:               "msg-1",
			ConversationType: "groupchat",
			SenderID:         "target@conference.imopenfire1-lanzhou",
			ReceiverID:       "member@imopenfire1-lanzhou",
		}}},
	}
	fakeDisplay := &fakeDisplayEntitySource{entities: []msglib.DisplayEntity{
		{EntityType: msglib.EntityTypeGroups, SourceTable: "TD_WorkGroupAuth", JID: "zzz-target@conference.imopenfire1-lanzhou", DisplayName: "ZZZ Target Group", Confidence: 0.8},
		{EntityType: msglib.EntityTypeGroups, SourceTable: "TD_WorkGroupAuth", JID: "target@conference.imopenfire1-lanzhou", DisplayName: "Target Group", Confidence: 0.9},
	}}
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereGroupToolsWithDisplayEntities(server, fakeMessages, fakeDisplay)
	})
	defer cleanup()

	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name:      ToolNameSearchGroups,
		Arguments: map[string]any{"query": "target@conference.imopenfire1-lanzhou", "limit": 10},
	})
	if err != nil {
		t.Fatalf("call %s: %v", ToolNameSearchGroups, err)
	}
	if callResult.IsError {
		t.Fatalf("call result is error: %+v", callResult)
	}

	var decoded struct {
		Groups []struct {
			GroupID string `json:"group_id"`
			Source  string `json:"source"`
			RawRef  string `json:"raw_ref"`
		} `json:"groups"`
	}
	payload, _ := json.Marshal(callResult.StructuredContent)
	if err := json.Unmarshal(payload, &decoded); err != nil {
		t.Fatalf("decode structured content %s: %v", payload, err)
	}
	if len(decoded.Groups) != 2 {
		t.Fatalf("groups = %+v, want exact and substring only", decoded.Groups)
	}
	if decoded.Groups[0].GroupID != "target@conference.imopenfire1-lanzhou" || decoded.Groups[0].Source != "msglib_readonly" || decoded.Groups[0].RawRef != "msglib:TD_WorkGroupAuth" {
		t.Fatalf("first group should be exact MsgLib match with source metadata, got %+v", decoded.Groups[0])
	}
	if decoded.Groups[1].GroupID != "zzz-target@conference.imopenfire1-lanzhou" {
		t.Fatalf("second group should be substring match, got %+v", decoded.Groups[1])
	}
}

func TestISphereSearchGroupsToolValidatesContractArgs(t *testing.T) {
	fake := &fakeReceiveMessagesSource{
		result: isphere.ReceiveMessagesResult{Messages: []isphere.Message{{
			ID:               "msg-group-1",
			ConversationType: "groupchat",
			SenderID:         "project-room@conference.imopenfire1-lanzhou",
			ReceiverID:       "user@imopenfire1-lanzhou",
		}}},
	}
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereGroupTools(server, fake)
	})
	defer cleanup()

	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name: ToolNameSearchGroups,
		Arguments: map[string]any{
			"query":             "project",
			"source_preference": "local_readonly",
			"include_archived":  true,
			"cursor":            "",
			"limit":             10,
		},
	})
	if err != nil {
		t.Fatalf("call with safe contract args: %v", err)
	}
	if callResult.IsError {
		t.Fatalf("call result is error: %+v", callResult)
	}

	bridgeResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name:      ToolNameSearchGroups,
		Arguments: map[string]any{"query": "project", "source_preference": "bridge"},
	})
	if err == nil && !bridgeResult.IsError {
		t.Fatalf("bridge source_preference was accepted before connector exists")
	}

	cursorResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name:      ToolNameSearchGroups,
		Arguments: map[string]any{"query": "project", "cursor": "next-page"},
	})
	if err == nil && !cursorResult.IsError {
		t.Fatalf("non-empty cursor was accepted before pagination exists")
	}
}