package parser

import (
	"log/slog"
	"os"
	"path/filepath"
	"testing"
	"watch-tool/patterns"

	"codeberg.org/pata1704/drain3"
)

func setupPatterns(t *testing.T) {
	content := `
patterns:
  common:
    extractors:
      - name: "syslog_header"
        regex: '^\w{3} \d{2} \d{2}:\d{2}:\d{2} (?P<hostname>\S+) .*'
        fields:
          hostname: "string"

  test_service:
    extractors:
      - name: "data_line"
        regex: 'Data: id=(?P<id>\d+) size=(?P<size_mb>[0-9.]+) active=(?P<is_active>true|false) empty=(?P<empty_val>\S+)'
        fields:
          id: "int"
          size_mb: "float"
          is_active: "bool"
          empty_val: "int" # Testet Fallback bei "-"
`
	tmpfile, err := os.CreateTemp("", "patterns_parser_test_*.yaml")
	if err != nil {
		t.Fatal(err)
	}
	defer os.Remove(tmpfile.Name())

	if _, err := tmpfile.Write([]byte(content)); err != nil {
		t.Fatal(err)
	}
	tmpfile.Close()

	if err := patterns.GetInstance().Load(tmpfile.Name()); err != nil {
		t.Fatal(err)
	}
}

func TestGenericParser_Parse_Regex(t *testing.T) {
	setupPatterns(t)

	p := NewGenericParser("test_service", "localhost", nil, "")

	line := "Sep 28 10:00:00 myhost Data: id=42 size=12.5 active=true empty=-"
	entry, err := p.Parse(line)
	if err != nil {
		t.Fatalf("Parse failed: %v", err)
	}

	if entry.Host != "myhost" {
		t.Errorf("Expected host 'myhost', got '%s'", entry.Host)
	}

	if val, ok := entry.Fields["id"].(int); !ok || val != 42 {
		t.Errorf("Expected id=42 (int), got %v (%T)", entry.Fields["id"], entry.Fields["id"])
	}

	if val, ok := entry.Fields["size_mb"].(float64); !ok || val != 12.5 {
		t.Errorf("Expected size_mb=12.5 (float), got %v", entry.Fields["size_mb"])
	}

	if val, ok := entry.Fields["is_active"].(bool); !ok || val != true {
		t.Errorf("Expected is_active=true, got %v", entry.Fields["is_active"])
	}

	if val, ok := entry.Fields["empty_val"].(int); !ok || val != 0 {
		t.Errorf("Expected empty_val=0 for '-', got %v", entry.Fields["empty_val"])
	}
}

func TestGenericParser_Drain3_Integration(t *testing.T) {
	setupPatterns(t)

	opts := &slog.HandlerOptions{Level: slog.LevelDebug}
	logger := slog.New(slog.NewTextHandler(os.Stdout, opts))
	slog.SetDefault(logger)

	tmpDir, err := os.MkdirTemp("", "drain_state_test")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(tmpDir)

	drainCfg := &drain3.Config{
		Depth:       4,
		SimTh:       0.5,
		MaxChildren: 100,
		MaxClusters: 100,
	}

	serviceName := "test_service"
	p := NewGenericParser(serviceName, "localhost", drainCfg, tmpDir)

	log1 := "User admin logged in from 192.168.1.1"
	log2 := "User guest logged in from 10.0.0.1"

	entry1, _ := p.Parse(log1)
	if entry1.Fields["drain_template_id"] == nil {
		t.Error("Drain3 did not assign a template ID for log1")
	}

	entry2, _ := p.Parse(log2)

	id1 := entry1.Fields["drain_template_id"]
	id2 := entry2.Fields["drain_template_id"]
	t.Logf("IDs: %v -> %v", id1, id2)
	t.Logf("Template 2: %s", entry2.Fields["drain_template"])

	if err := p.Close(); err != nil {
		t.Fatalf("Close failed: %v", err)
	}

	expectedFile := filepath.Join(tmpDir, serviceName+".bin")

	if info, err := os.Stat(expectedFile); os.IsNotExist(err) {
		t.Errorf("Drain3 state file NOT found at: %s", expectedFile)

		entries, _ := os.ReadDir(tmpDir)
		t.Logf("Listing directory %s:", tmpDir)
		for _, e := range entries {
			t.Logf(" - Found file: %s", e.Name())
		}
	} else {
		t.Logf("Success: State file found (%d bytes)", info.Size())
	}
}

func TestGenericParser_Robustness(t *testing.T) {
	setupPatterns(t)

	p := NewGenericParser("test_service", "localhost", nil, "")

	tests := []struct {
		name          string
		log           string
		checkField    string
		expectedValue any
		shouldFail    bool
	}{
		{
			name:          "Empty Line",
			log:           "",
			checkField:    "",
			expectedValue: nil,
			shouldFail:    false,
		},
		{
			name:          "Type Mismatch Int (Text instead of Int)",
			log:           "Data: id=abc size=12.5 active=true empty=-",
			checkField:    "_parse_status",
			expectedValue: "failed",
		},
		{
			name:          "Value Missing (Dash) for Int",
			log:           "Data: id=1 size=1.0 active=true empty=-",
			checkField:    "empty_val",
			expectedValue: 0,
		},
		{
			name:          "Value Missing (Dash) for Float",
			log:           "Data: id=1 size=1.0 active=true empty=0",
			checkField:    "size_mb",
			expectedValue: 1.0,
		},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			entry, err := p.Parse(tc.log)
			if err != nil {
				t.Fatalf("Unexpected error: %v", err)
			}

			if tc.checkField != "" {
				val, exists := entry.Fields[tc.checkField]
				if tc.expectedValue == "failed" {
					if !exists || val != "failed" {
						t.Errorf("Expected parse failure status, got %v", val)
					}
				} else {
					if val != tc.expectedValue {
						t.Errorf("Field %s: expected %v, got %v", tc.checkField, tc.expectedValue, val)
					}
				}
			}
		})
	}
}