package tracking_test

import (
	"context"
	"log/slog"
	"testing"

	"github.com/jfraeys/fetch_ml/internal/logging"
	"github.com/jfraeys/fetch_ml/internal/tracking"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// mockPlugin is a test plugin implementation
type mockPlugin struct {
	name        string
	provisioned bool
	tornDown    bool
}

func (m *mockPlugin) Name() string { return m.name }
func (m *mockPlugin) ProvisionSidecar(ctx context.Context, taskID string, config tracking.ToolConfig) (map[string]string, error) {
	m.provisioned = true
	return map[string]string{"MOCK_VAR": "value"}, nil
}
func (m *mockPlugin) Teardown(ctx context.Context, taskID string) error {
	m.tornDown = true
	return nil
}
func (m *mockPlugin) HealthCheck(ctx context.Context, config tracking.ToolConfig) bool { return true }

// TestNewRegistry tests registry creation
func TestNewRegistry(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(slog.LevelInfo, false)
	registry := tracking.NewRegistry(logger)
	require.NotNil(t, registry)
}

// TestRegisterAndGet tests plugin registration and retrieval
func TestRegisterAndGet(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(slog.LevelInfo, false)
	registry := tracking.NewRegistry(logger)

	plugin := &mockPlugin{name: "test-plugin"}
	registry.Register(plugin)

	retrieved, ok := registry.Get("test-plugin")
	require.True(t, ok)
	assert.Equal(t, "test-plugin", retrieved.Name())

	// Nonexistent plugin
	_, ok = registry.Get("nonexistent")
	assert.False(t, ok)
}

// TestProvisionAllEmpty tests empty config provisioning
func TestProvisionAllEmpty(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(slog.LevelInfo, false)
	registry := tracking.NewRegistry(logger)

	env, err := registry.ProvisionAll(context.Background(), "task-1", nil)
	require.NoError(t, err)
	assert.Nil(t, env)

	env, err = registry.ProvisionAll(context.Background(), "task-1", map[string]tracking.ToolConfig{})
	require.NoError(t, err)
	assert.Nil(t, env)
}

// TestProvisionAllDisabled tests disabled plugin handling
func TestProvisionAllDisabled(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(slog.LevelInfo, false)
	registry := tracking.NewRegistry(logger)

	plugin := &mockPlugin{name: "disabled-plugin"}
	registry.Register(plugin)

	configs := map[string]tracking.ToolConfig{
		"disabled-plugin": {Enabled: false, Mode: tracking.ModeSidecar},
	}

	env, err := registry.ProvisionAll(context.Background(), "task-1", configs)
	require.NoError(t, err)
	assert.Empty(t, env)
	assert.False(t, plugin.provisioned)
}

// TestProvisionAllUnregistered tests unregistered plugin error
func TestProvisionAllUnregistered(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(slog.LevelInfo, false)
	registry := tracking.NewRegistry(logger)

	configs := map[string]tracking.ToolConfig{
		"unregistered": {Enabled: true, Mode: tracking.ModeSidecar},
	}

	_, err := registry.ProvisionAll(context.Background(), "task-1", configs)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "not registered")
}

// TestTeardownAll tests plugin teardown
func TestTeardownAll(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(slog.LevelInfo, false)
	registry := tracking.NewRegistry(logger)

	plugin := &mockPlugin{name: "teardown-test"}
	registry.Register(plugin)

	// Provision first
	configs := map[string]tracking.ToolConfig{
		"teardown-test": {Enabled: true, Mode: tracking.ModeSidecar},
	}
	_, err := registry.ProvisionAll(context.Background(), "task-1", configs)
	require.NoError(t, err)

	// Then teardown
	registry.TeardownAll(context.Background(), "task-1")
	assert.True(t, plugin.tornDown)

	// Teardown nonexistent task should not panic
	registry.TeardownAll(context.Background(), "nonexistent-task")
}

// TestNewPortAllocator tests allocator creation
func TestNewPortAllocator(t *testing.T) {
	t.Parallel()

	cases := []struct {
		name      string
		start     int
		end       int
		wantStart int
		wantEnd   int
	}{
		{"valid range", 5000, 5100, 5000, 5100},
		{"zero values", 0, 0, 5500, 5600},
		{"invalid range", 100, 50, 5500, 5600},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			allocator := tracking.NewPortAllocator(tc.start, tc.end)
			require.NotNil(t, allocator)

			port, err := allocator.Allocate()
			require.NoError(t, err)
			assert.GreaterOrEqual(t, port, tc.wantStart)
			assert.Less(t, port, tc.wantEnd)
		})
	}
}

// TestPortAllocatorAllocate tests port allocation
func TestPortAllocatorAllocate(t *testing.T) {
	t.Parallel()

	allocator := tracking.NewPortAllocator(8000, 8003)

	// Allocate all ports
	ports := make([]int, 0, 3)
	for i := 0; i < 3; i++ {
		port, err := allocator.Allocate()
		require.NoError(t, err)
		ports = append(ports, port)
	}

	// Should be unique
	assert.Len(t, ports, 3)
	assert.NotEqual(t, ports[0], ports[1])

	// No more ports available
	_, err := allocator.Allocate()
	require.Error(t, err)
}

// TestPortAllocatorRelease tests port release and reuse
func TestPortAllocatorRelease(t *testing.T) {
	t.Parallel()

	allocator := tracking.NewPortAllocator(9000, 9005)

	port1, err := allocator.Allocate()
	require.NoError(t, err)

	// Allocate another port to move next pointer forward
	port2, err := allocator.Allocate()
	require.NoError(t, err)
	require.NotEqual(t, port1, port2)

	// Release the first port
	allocator.Release(port1)

	// Allocate again - should eventually get the released port back
	// (after scanning through other ports)
	var foundReleased bool
	for i := 0; i < 10; i++ {
		p, err := allocator.Allocate()
		require.NoError(t, err)
		if p == port1 {
			foundReleased = true
			break
		}
		// Release it to keep scanning
		allocator.Release(p)
	}
	assert.True(t, foundReleased, "Should eventually get released port back")
}

// TestStringSetting tests settings extraction
func TestStringSetting(t *testing.T) {
	t.Parallel()

	cases := []struct {
		name     string
		settings map[string]any
		key      string
		want     string
	}{
		{"valid string", map[string]any{"key": "value"}, "key", "value"},
		{"nil settings", nil, "key", ""},
		{"missing key", map[string]any{"other": "value"}, "key", ""},
		{"non-string value", map[string]any{"key": 123}, "key", ""},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got := tracking.StringSetting(tc.settings, tc.key)
			assert.Equal(t, tc.want, got)
		})
	}
}

// TestToolModeConstants tests mode constants
func TestToolModeConstants(t *testing.T) {
	t.Parallel()

	assert.Equal(t, tracking.ToolMode("sidecar"), tracking.ModeSidecar)
	assert.Equal(t, tracking.ToolMode("remote"), tracking.ModeRemote)
	assert.Equal(t, tracking.ToolMode("disabled"), tracking.ModeDisabled)
}

// TestToolConfigStructure tests config fields
func TestToolConfigStructure(t *testing.T) {
	t.Parallel()

	config := tracking.ToolConfig{
		Settings: map[string]any{"port": 8080},
		Mode:     tracking.ModeSidecar,
		Enabled:  true,
	}

	assert.True(t, config.Enabled)
	assert.Equal(t, tracking.ModeSidecar, config.Mode)
}