package tools

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

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

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

func TestISphereReceiveFilesToolReturnsLogBackedFiles(t *testing.T) {
	fake := &fakeReceiveMessagesSource{
		result: isphere.ReceiveMessagesResult{Messages: []isphere.Message{{
			ID:             "msg-file-1",
			ConversationID: "alice@imopenfire1-lanzhou|bob@imopenfire1-lanzhou",
			Text:           "redacted-report.docx",
			Timestamp:      "1783423807000",
			Subject:        "FILE_TRANSFER_CANCEL",
		}}},
	}
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereFileTools(server, fake)
	})
	defer cleanup()

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

	var decoded struct {
		OK    bool   `json:"ok"`
		Mode  string `json:"mode"`
		Files []struct {
			FileID         string  `json:"file_id"`
			MessageID      string  `json:"message_id"`
			ConversationID string  `json:"conversation_id"`
			FileName       string  `json:"file_name"`
			SizeBytes      *int64  `json:"size_bytes"`
			MimeType       string  `json:"mime_type"`
			CreatedAt      string  `json:"created_at"`
			DownloadRef    *string `json:"download_ref"`
			SavedPath      *string `json:"saved_path"`
			SHA256         *string `json:"sha256"`
			Source         string  `json:"source"`
		} `json:"files"`
		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 || decoded.Mode != "list" {
		t.Fatalf("ok/mode = %v/%q in %s", decoded.OK, decoded.Mode, payload)
	}
	if len(decoded.Files) != 1 {
		t.Fatalf("files = %+v, want one", decoded.Files)
	}
	file := decoded.Files[0]
	if file.FileID != "msg-file-1:redacted-report.docx" || file.MessageID != "msg-file-1" || file.ConversationID != "alice@imopenfire1-lanzhou|bob@imopenfire1-lanzhou" {
		t.Fatalf("unexpected file identity: %+v", file)
	}
	if file.FileName != "redacted-report.docx" || file.MimeType != "application/vnd.openxmlformats-officedocument.wordprocessingml.document" || file.CreatedAt != "1783423807000" {
		t.Fatalf("unexpected file metadata: %+v", file)
	}
	if file.SizeBytes != nil || file.DownloadRef != nil || file.SavedPath != nil || file.SHA256 != nil {
		t.Fatalf("download/cache fields should be unknown: %+v", file)
	}
	if file.Source != "local_readonly" {
		t.Fatalf("source = %q", file.Source)
	}
	if decoded.Audit["tool"] != ToolNameReceiveFiles || decoded.Audit["result"] != "ok" || decoded.Audit["execution_mode"] != "read" {
		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 TestISphereReceiveFilesToolValidatesContractArgs(t *testing.T) {
	fake := &fakeReceiveMessagesSource{
		result: isphere.ReceiveMessagesResult{Messages: []isphere.Message{{
			ID:             "msg-file-1",
			ConversationID: "alice@imopenfire1-lanzhou|bob@imopenfire1-lanzhou",
			Text:           "redacted-report.docx",
			Timestamp:      "1783423807000",
			Subject:        "FILE_TRANSFER_CANCEL",
		}}},
	}
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereFileTools(server, fake)
	})
	defer cleanup()

	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name: ToolNameReceiveFiles,
		Arguments: map[string]any{
			"mode":              "list",
			"name_contains":     "report",
			"source_preference": "local_readonly",
			"preview":           true,
			"cursor":            "",
			"output_dir":        "",
			"limit":             5,
		},
	})
	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:      ToolNameReceiveFiles,
		Arguments: map[string]any{"mode": "list", "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:      ToolNameReceiveFiles,
		Arguments: map[string]any{"mode": "list", "cursor": "next-page"},
	})
	if err == nil && !cursorResult.IsError {
		t.Fatalf("non-empty cursor was accepted before pagination exists")
	}

	outputResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name:      ToolNameReceiveFiles,
		Arguments: map[string]any{"mode": "list", "output_dir": "C:\\tmp\\isphere"},
	})
	if err == nil && !outputResult.IsError {
		t.Fatalf("output_dir was accepted in list mode before download exists")
	}

	downloadResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name: ToolNameReceiveFiles,
		Arguments: map[string]any{
			"mode":    "download",
			"preview": true,
			"file_id": "msg-file-1:redacted-report.docx",
		},
	})
	if err != nil {
		t.Fatalf("download preview returned transport error: %v", err)
	}
	if downloadResult.IsError {
		t.Fatalf("download preview should return structured blocked content: %+v", downloadResult.Content)
	}
	var downloadPayload map[string]any
	downloadEncoded, _ := json.Marshal(downloadResult.StructuredContent)
	if err := json.Unmarshal(downloadEncoded, &downloadPayload); err != nil {
		t.Fatalf("decode download structured content %s: %v", downloadEncoded, err)
	}
	if downloadPayload["ok"] != false || downloadPayload["download_status"] != "blocked" || downloadPayload["blocked_reason_code"] != "file_cache_mapping_missing" {
		t.Fatalf("unexpected download preview block: %s", downloadEncoded)
	}
}

func TestISphereReceiveFilesDownloadPreviewBlockedWithoutMapping(t *testing.T) {
	fake := &fakeReceiveMessagesSource{}
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereFileTools(server, fake)
	})
	defer cleanup()

	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name: ToolNameReceiveFiles,
		Arguments: map[string]any{
			"mode":       "download",
			"preview":    true,
			"file_ref":   "msg-file-1:redacted-report.docx",
			"output_dir": "C:\\tmp\\isphere-downloads",
		},
	})
	if err != nil {
		t.Fatalf("download preview call returned transport error: %v", err)
	}
	if callResult.IsError {
		t.Fatalf("download preview should return structured blocked content, got error: %+v", callResult)
	}

	var decoded struct {
		OK                bool   `json:"ok"`
		Mode              string `json:"mode"`
		DownloadStatus    string `json:"download_status"`
		BlockedReasonCode string `json:"blocked_reason_code"`
		FileContentsRead  bool   `json:"file_contents_read"`
		FileCopied        bool   `json:"file_copied"`
		RealDownload      bool   `json:"real_download_attempted"`
	}
	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 || decoded.Mode != "download" || decoded.DownloadStatus != "blocked" {
		t.Fatalf("unexpected blocked response: %+v payload=%s", decoded, payload)
	}
	if decoded.BlockedReasonCode != "file_cache_mapping_missing" {
		t.Fatalf("blocked reason = %q", decoded.BlockedReasonCode)
	}
	if decoded.FileContentsRead || decoded.FileCopied || decoded.RealDownload {
		t.Fatalf("download side effects must be false: %+v", decoded)
	}
}

func TestISphereReceiveFilesDownloadPreviewPlannedWithFixtureMapping(t *testing.T) {
	resolver := receiveFileDownloadResolverFunc(func(ctx context.Context, query ReceiveFileDownloadQuery) (ReceiveFileDownloadResolution, error) {
		if query.FileRef != "msg-file-1:redacted-report.docx" {
			t.Fatalf("resolver file_ref = %q", query.FileRef)
		}
		if query.OutputDir != "C:\\tmp\\isphere-downloads" {
			t.Fatalf("resolver output_dir = %q", query.OutputDir)
		}
		return ReceiveFileDownloadResolution{
			Found:        true,
			Source:       "fixture-cache-mapping",
			MatchedScore: 100,
		}, nil
	})
	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
		RegisterISphereFileToolsWithDownloadResolver(server, nil, resolver)
	})
	defer cleanup()

	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
		Name: ToolNameReceiveFiles,
		Arguments: map[string]any{
			"mode":       "download",
			"preview":    true,
			"file_ref":   "msg-file-1:redacted-report.docx",
			"output_dir": "C:\\tmp\\isphere-downloads",
		},
	})
	if err != nil {
		t.Fatalf("download preview call returned transport error: %v", err)
	}
	if callResult.IsError {
		t.Fatalf("download preview should return planned content, got error: %+v", callResult)
	}

	var decoded struct {
		OK               bool   `json:"ok"`
		Mode             string `json:"mode"`
		DownloadStatus   string `json:"download_status"`
		FileRef          string `json:"file_ref"`
		MappingSource    string `json:"mapping_source"`
		MatchedScore     int    `json:"matched_score"`
		FileContentsRead bool   `json:"file_contents_read"`
		FileCopied       bool   `json:"file_copied"`
		RealDownload     bool   `json:"real_download_attempted"`
	}
	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 || decoded.Mode != "download" || decoded.DownloadStatus != "planned" {
		t.Fatalf("unexpected planned response: %+v payload=%s", decoded, payload)
	}
	if decoded.FileRef != "msg-file-1:redacted-report.docx" || decoded.MappingSource != "fixture-cache-mapping" || decoded.MatchedScore != 100 {
		t.Fatalf("unexpected mapping metadata: %+v", decoded)
	}
	if decoded.FileContentsRead || decoded.FileCopied || decoded.RealDownload {
		t.Fatalf("preview side effects must be false: %+v", decoded)
	}
}