package server

import (
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"sort"
	"strings"
	"testing"

	mcpgo "github.com/mark3labs/mcp-go/server"

	"gitea.fe.kaien.ru/kaien/woodpecker-mcp/internal/woodpecker"
)

func TestServerRegistersAllTools(t *testing.T) {
	c, err := woodpecker.NewClient("http://localhost:8000/api", "token")
	if err != nil {
		t.Fatal(err)
	}

	srv := New(c)
	tools := srv.ListTools()

	got := make([]string, 0, len(tools))
	for name := range tools {
		got = append(got, name)
	}
	sort.Strings(got)

	want := []string{
		"get_pipeline",
		"get_pipeline_config",
		"get_repository_by_id",
		"get_step_logs",
		"list_pipelines",
		"list_repositories",
		"search_repository",
	}
	if len(got) != len(want) {
		t.Fatalf("registered %d tools, want %d: %v", len(got), len(want), got)
	}
	for i := range want {
		if got[i] != want[i] {
			t.Errorf("tool[%d] = %q, want %q", i, got[i], want[i])
		}
	}
}

func TestServerHasNoPrompts(t *testing.T) {
	c, err := woodpecker.NewClient("http://localhost:8000/api", "token")
	if err != nil {
		t.Fatal(err)
	}
	srv := New(c)

	if prompts := srv.ListPrompts(); len(prompts) != 0 {
		t.Errorf("prompts must be disabled, got %d", len(prompts))
	}
}

// TestStreamableHTTPHandshake exercises the remote transport: a POST
// initialize over Streamable HTTP must answer with the server info.
func TestStreamableHTTPHandshake(t *testing.T) {
	c, err := woodpecker.NewClient("http://localhost:8000/api", "token")
	if err != nil {
		t.Fatal(err)
	}

	httpServer := mcpgo.NewStreamableHTTPServer(New(c))
	ts := httptest.NewServer(httpServer)
	defer ts.Close()

	req, err := http.NewRequest(http.MethodPost, ts.URL+"/mcp",
		strings.NewReader(`{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}`))
	if err != nil {
		t.Fatal(err)
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Accept", "application/json")

	resp, err := ts.Client().Do(req)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, body = %s", resp.StatusCode, body)
	}

	var message struct {
		Result struct {
			ProtocolVersion string `json:"protocolVersion"`
			ServerInfo      struct {
				Name    string `json:"name"`
				Version string `json:"version"`
			} `json:"serverInfo"`
			Capabilities struct {
				Tools struct {
					ListChanged bool `json:"listChanged"`
				} `json:"tools"`
			} `json:"capabilities"`
		} `json:"result"`
	}
	if err := json.Unmarshal(body, &message); err != nil {
		t.Fatalf("invalid JSON-RPC response: %v\n%s", err, body)
	}
	if message.Result.ServerInfo.Name != "woodpecker-mcp" {
		t.Errorf("server name = %q", message.Result.ServerInfo.Name)
	}
	if !message.Result.Capabilities.Tools.ListChanged {
		t.Error("tools capability missing listChanged")
	}
}