package rules

import (
	"encoding/json"
	"testing"
)

func TestUnmarshalRule(t *testing.T) {
	tests := []struct {
		name    string
		json    string
		wantErr bool
		check   func(t *testing.T, rule Rule)
	}{
		{
			name:    "mimetype rule",
			json:    `{"mimetype": "text/html", "extractors": [{"key": "obelisk"}]}`,
			wantErr: false,
			check: func(t *testing.T, rule Rule) {
				mr, ok := rule.(*MimetypeRule)
				if !ok {
					t.Fatalf("expected MimetypeRule, got %T", rule)
				}
				if mr.Mimetype != "text/html" {
					t.Errorf("Mimetype = %q, want %q", mr.Mimetype, "text/html")
				}
				if len(mr.Archivers) != 1 || mr.Archivers[0].Key != "obelisk" {
					t.Errorf("Archivers = %v, want [{key: obelisk}]", mr.Archivers)
				}
			},
		},
		{
			name:    "hostname rule",
			json:    `{"hostname": "example.com", "extractors": [{"key": "direct_download"}]}`,
			wantErr: false,
			check: func(t *testing.T, rule Rule) {
				hr, ok := rule.(*HostnameRule)
				if !ok {
					t.Fatalf("expected HostnameRule, got %T", rule)
				}
				if hr.Hostname != "example.com" {
					t.Errorf("Hostname = %q, want %q", hr.Hostname, "example.com")
				}
			},
		},
		{
			name:    "and rule",
			json:    `{"and": [{"mimetype": "text/html"}, {"hostname": "example.com"}], "extractors": [{"key": "obelisk"}]}`,
			wantErr: false,
			check: func(t *testing.T, rule Rule) {
				ar, ok := rule.(*AndRule)
				if !ok {
					t.Fatalf("expected AndRule, got %T", rule)
				}
				if len(ar.Rules) != 2 {
					t.Errorf("Rules length = %d, want 2", len(ar.Rules))
				}
			},
		},
		{
			name:    "or rule",
			json:    `{"or": [{"mimetype": "text/html"}, {"hostname": "example.com"}], "extractors": [{"key": "obelisk"}]}`,
			wantErr: false,
			check: func(t *testing.T, rule Rule) {
				or, ok := rule.(*OrRule)
				if !ok {
					t.Fatalf("expected OrRule, got %T", rule)
				}
				if len(or.Rules) != 2 {
					t.Errorf("Rules length = %d, want 2", len(or.Rules))
				}
			},
		},
		{
			name:    "nested and/or rules",
			json:    `{"and": [{"or": [{"mimetype": "text/html"}, {"mimetype": "application/json"}]}, {"hostname": "example.com"}], "extractors": [{"key": "obelisk"}]}`,
			wantErr: false,
			check: func(t *testing.T, rule Rule) {
				ar, ok := rule.(*AndRule)
				if !ok {
					t.Fatalf("expected AndRule, got %T", rule)
				}
				if len(ar.Rules) != 2 {
					t.Errorf("Rules length = %d, want 2", len(ar.Rules))
				}
				or, ok := ar.Rules[0].(*OrRule)
				if !ok {
					t.Fatalf("expected first child to be OrRule, got %T", ar.Rules[0])
				}
				if len(or.Rules) != 2 {
					t.Errorf("OrRule children length = %d, want 2", len(or.Rules))
				}
			},
		},
		{
			name:    "invalid rule - no type field",
			json:    `{"extractors": [{"key": "obelisk"}]}`,
			wantErr: true,
		},
		{
			name:    "invalid json",
			json:    `{invalid json}`,
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			rule, err := UnmarshalRule([]byte(tt.json))
			if (err != nil) != tt.wantErr {
				t.Errorf("UnmarshalRule() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if tt.wantErr {
				return
			}
			if rule == nil {
				t.Fatal("UnmarshalRule() returned nil rule")
			}
			if tt.check != nil {
				tt.check(t, rule)
			}
		})
	}
}

func TestUnmarshalRuleConfig(t *testing.T) {
	tests := []struct {
		name    string
		json    string
		wantErr bool
		check   func(t *testing.T, config *RuleConfig)
	}{
		{
			name:    "valid config",
			json:    `{"rules": [{"mimetype": "text/html", "extractors": [{"key": "obelisk"}]}], "default_extractors": [{"key": "direct_download"}]}`,
			wantErr: false,
			check: func(t *testing.T, config *RuleConfig) {
				if len(config.Rules) != 1 {
					t.Errorf("Rules length = %d, want 1", len(config.Rules))
				}
				if len(config.DefaultArchivers) != 1 || config.DefaultArchivers[0].Key != "direct_download" {
					t.Errorf("DefaultArchivers = %v, want [{key: direct_download}]", config.DefaultArchivers)
				}
			},
		},
		{
			name:    "empty rules",
			json:    `{"rules": [], "default_extractors": [{"key": "obelisk"}]}`,
			wantErr: false,
			check: func(t *testing.T, config *RuleConfig) {
				if len(config.Rules) != 0 {
					t.Errorf("Rules length = %d, want 0", len(config.Rules))
				}
			},
		},
		{
			name:    "invalid json",
			json:    `{invalid json}`,
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			config, err := UnmarshalRuleConfig([]byte(tt.json))
			if (err != nil) != tt.wantErr {
				t.Errorf("UnmarshalRuleConfig() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if tt.wantErr {
				return
			}
			if config == nil {
				t.Fatal("UnmarshalRuleConfig() returned nil config")
			}
			if tt.check != nil {
				tt.check(t, config)
			}
		})
	}
}

func TestUnmarshalRule_RoundTrip(t *testing.T) {
	// Test that we can marshal and unmarshal rules correctly
	original := &MimetypeRule{
		Mimetype: "application/*",
		Archivers: []ArchiverConfig{
			{Key: "direct_download", Config: map[string]any{"timeout": "5m"}},
		},
	}

	// Marshal
	data, err := json.Marshal(original)
	if err != nil {
		t.Fatalf("Marshal() error = %v", err)
	}

	// Unmarshal
	unmarshaled, err := UnmarshalRule(data)
	if err != nil {
		t.Fatalf("UnmarshalRule() error = %v", err)
	}

	// Check
	mr, ok := unmarshaled.(*MimetypeRule)
	if !ok {
		t.Fatalf("expected MimetypeRule, got %T", unmarshaled)
	}
	if mr.Mimetype != original.Mimetype {
		t.Errorf("Mimetype = %q, want %q", mr.Mimetype, original.Mimetype)
	}
	if len(mr.Archivers) != len(original.Archivers) {
		t.Errorf("Archivers length = %d, want %d", len(mr.Archivers), len(original.Archivers))
	}
}