package devagents

import (
	"log/slog"
	"os"
	"testing"

	"github.com/enmanuel/agents/internal/config"
	toolmemory "github.com/enmanuel/agents/tools/memorytools"
)

func TestBuildToolRegistry_MinimalConfig(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	// Always-registered tools: current_time, weather, matrix_send
	names := reg.Names()
	if len(names) < 3 {
		t.Fatalf("expected at least 3 always-on tools, got %d: %v", len(names), names)
	}
	assertToolRegistered(t, reg, "current_time")
	assertToolRegistered(t, reg, "get_weather")
	assertToolRegistered(t, reg, "matrix_send")
}

func TestBuildToolRegistry_HTTPEnabled(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
		Tools: config.ToolsCfg{
			HTTP: config.HTTPToolCfg{Enabled: true, AllowedDomains: []string{"example.com"}},
		},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	assertToolRegistered(t, reg, "http_get")
	assertToolRegistered(t, reg, "http_post")
}

func TestBuildToolRegistry_HTTPDisabled(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	assertToolNotRegistered(t, reg, "http_get")
	assertToolNotRegistered(t, reg, "http_post")
}

func TestBuildToolRegistry_FileOpsReadOnly(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
		Tools: config.ToolsCfg{
			FileOps: config.FileOpsCfg{Enabled: true, ReadOnly: true, AllowedPaths: []string{"/tmp"}},
		},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	assertToolRegistered(t, reg, "read_file")
	assertToolRegistered(t, reg, "list_directory")
	assertToolNotRegistered(t, reg, "write_file")
	assertToolNotRegistered(t, reg, "append_file")
	assertToolNotRegistered(t, reg, "delete_file")
}

func TestBuildToolRegistry_FileOpsReadWrite(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
		Tools: config.ToolsCfg{
			FileOps: config.FileOpsCfg{Enabled: true, ReadOnly: false, AllowedPaths: []string{"/tmp"}},
		},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	assertToolRegistered(t, reg, "read_file")
	assertToolRegistered(t, reg, "list_directory")
	assertToolRegistered(t, reg, "write_file")
	assertToolRegistered(t, reg, "append_file")
	assertToolRegistered(t, reg, "delete_file")
}

func TestBuildToolRegistry_IMDbEnabled(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
		Tools: config.ToolsCfg{
			IMDb: config.IMDbToolCfg{Enabled: true},
		},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	assertToolRegistered(t, reg, "imdb_search")
}

func TestBuildToolRegistry_SSHEnabled(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
		Tools: config.ToolsCfg{
			SSH: config.SSHToolCfg{Enabled: true},
		},
	}
	roomCtx := &toolmemory.RoomContext{}

	// SSH tool requires an executor; passing nil is fine for registration (only used at exec time)
	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	assertToolRegistered(t, reg, "ssh_command")
}

func TestBuildToolRegistry_ToolCount(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))

	// Enable everything that doesn't need external deps
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "test-agent"},
		Tools: config.ToolsCfg{
			HTTP:    config.HTTPToolCfg{Enabled: true},
			SSH:     config.SSHToolCfg{Enabled: true},
			FileOps: config.FileOpsCfg{Enabled: true, AllowedPaths: []string{"/tmp"}},
			IMDb:    config.IMDbToolCfg{Enabled: true},
		},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	// 4 always-on (current_time, get_weather, wikipedia_search, matrix_send) + 2 HTTP + 1 SSH + 5 file + 1 IMDb = 13
	expected := 13
	if got := reg.Len(); got != expected {
		t.Errorf("expected %d tools, got %d: %v", expected, got, reg.Names())
	}
}

// ── Test helpers ────────────────────────────────────────────────────────────

func assertToolRegistered(t *testing.T, reg interface{ Names() []string }, name string) {
	t.Helper()
	for _, n := range reg.Names() {
		if n == name {
			return
		}
	}
	t.Errorf("expected tool %q to be registered, but it was not. Registered: %v", name, reg.Names())
}

func assertToolNotRegistered(t *testing.T, reg interface{ Names() []string }, name string) {
	t.Helper()
	for _, n := range reg.Names() {
		if n == name {
			t.Errorf("expected tool %q NOT to be registered, but it was", name)
			return
		}
	}
}

func TestBuildToolRegistry_DeviceMeshDisabled(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent:      config.AgentMeta{ID: "test-agent"},
		DeviceMesh: nil,
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	// None of the device_mesh tool names should appear when the block is nil.
	assertToolNotRegistered(t, reg, "exec")
	assertToolNotRegistered(t, reg, "shell.eval")
	assertToolNotRegistered(t, reg, "fs.read")
}

func TestBuildDeviceMeshRegistry_NoURLReturnsNil(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "agent-x"},
		DeviceMesh: &config.DeviceMeshConfig{
			Enabled: true,
			Mode:    "user",
			// no URL, no URLEnv
		},
	}
	if got := buildDeviceMeshRegistry(cfg, logger); got != nil {
		t.Errorf("expected nil registry when no URL is set, got %d tools", got.Len())
	}
}

func TestBuildDeviceMeshRegistry_URLEnvOverride(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	t.Setenv("TEST_DM_URL", "http://10.42.0.99:7474")

	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "agent-x"},
		DeviceMesh: &config.DeviceMeshConfig{
			Enabled:        true,
			Mode:           "user",
			DeviceAgentURL: "http://stale-url",
			URLEnv:         "TEST_DM_URL",
		},
	}
	reg := buildDeviceMeshRegistry(cfg, logger)
	if reg == nil {
		t.Fatalf("expected non-nil registry")
	}
	if reg.Client().BaseURL != "http://10.42.0.99:7474" {
		t.Errorf("URLEnv override failed: got %q", reg.Client().BaseURL)
	}
}

func TestBuildDeviceMeshRegistry_UserModeFiltersApproval(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "agent-x"},
		DeviceMesh: &config.DeviceMeshConfig{
			Enabled:        true,
			Mode:           "user",
			DeviceAgentURL: "http://dummy:7474",
		},
	}
	reg := buildDeviceMeshRegistry(cfg, logger)
	if reg == nil {
		t.Fatalf("expected non-nil registry")
	}
	for _, n := range reg.Names() {
		// User mode: pkg.install (requires approval) must not be present.
		if n == "pkg.install" {
			t.Errorf("user mode leaked approval-only tool: %s", n)
		}
	}
}

func TestBuildDeviceMeshRegistry_SudoModeKeepsOnlyApproval(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "agent-x-sudo"},
		DeviceMesh: &config.DeviceMeshConfig{
			Enabled:        true,
			Mode:           "sudo",
			DeviceAgentURL: "http://dummy:7474",
		},
	}
	reg := buildDeviceMeshRegistry(cfg, logger)
	if reg == nil {
		t.Fatalf("expected non-nil registry")
	}
	// pkg.install MUST be there in sudo mode.
	assertToolRegistered(t, reg, "pkg.install")
	// shell.eval is always registered (special-cased) and promoted to approval.
	spec, ok := reg.Get("shell.eval")
	if !ok {
		t.Fatalf("shell.eval should be registered in sudo mode too")
	}
	if !spec.RequiresApproval {
		t.Errorf("shell.eval in sudo mode should have RequiresApproval=true")
	}
}

func TestBuildDeviceMeshRegistry_ToolsAllowedNarrows(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "agent-x"},
		DeviceMesh: &config.DeviceMeshConfig{
			Enabled:        true,
			Mode:           "user",
			DeviceAgentURL: "http://dummy:7474",
			ToolsAllowed:   []string{"exec", "fs.read", "zzz.unknown"},
		},
	}
	reg := buildDeviceMeshRegistry(cfg, logger)
	if reg == nil {
		t.Fatalf("expected non-nil registry")
	}
	if reg.Len() != 2 {
		t.Errorf("expected 2 tools after filter, got %d: %v", reg.Len(), reg.Names())
	}
	assertToolRegistered(t, reg, "exec")
	assertToolRegistered(t, reg, "fs.read")
}

func TestBuildToolRegistry_DeviceMeshAdaptedIntoMainRegistry(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
	cfg := &config.AgentConfig{
		Agent: config.AgentMeta{ID: "agent-x"},
		DeviceMesh: &config.DeviceMeshConfig{
			Enabled:        true,
			Mode:           "user",
			DeviceAgentURL: "http://dummy:7474",
			ToolsAllowed:   []string{"exec"},
		},
	}
	roomCtx := &toolmemory.RoomContext{}

	reg := buildToolRegistry(cfg, nil, nil, nil, nil, nil, nil, nil, nil, roomCtx, logger)

	// The "exec" tool should appear in the main agent tool registry, alongside
	// the always-on tools, ready for the LLM tool-use loop to invoke.
	assertToolRegistered(t, reg, "exec")
	assertToolRegistered(t, reg, "current_time")
}