package validate

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"testing/fstest"

	"gitea.maximumdirect.net/eric/scriptorium/internal/domain"
)

func TestStandardValidatorNoneSkipped(t *testing.T) {
	v := NewStandardValidator("")

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte("ignored")}, domain.OutputContract{
		ValidationMode: domain.ValidationNone,
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationSkipped {
		t.Fatalf("expected skipped, got %q", res.Status)
	}
	if !res.IsValid {
		t.Fatal("expected valid=true for skipped")
	}
}

func TestStandardValidatorBasicSuccess(t *testing.T) {
	v := NewStandardValidator("")

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte("hello")}, domain.OutputContract{
		ValidationMode: domain.ValidationBasic,
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationPassed || !res.IsValid {
		t.Fatalf("expected passed/valid, got status=%q valid=%v", res.Status, res.IsValid)
	}
}

func TestStandardValidatorBasicFailureEmpty(t *testing.T) {
	v := NewStandardValidator("")

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte("  \n\t  ")}, domain.OutputContract{
		ValidationMode: domain.ValidationBasic,
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationFailed || res.IsValid {
		t.Fatalf("expected failed/invalid, got status=%q valid=%v", res.Status, res.IsValid)
	}
	if len(res.Errors) == 0 {
		t.Fatal("expected validation errors")
	}
}

func TestStandardValidatorJSONSuccess(t *testing.T) {
	v := NewStandardValidator("")

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"ok":true}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSON,
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationPassed || !res.IsValid {
		t.Fatalf("expected passed/valid, got status=%q valid=%v", res.Status, res.IsValid)
	}
}

func TestStandardValidatorJSONFailure(t *testing.T) {
	v := NewStandardValidator("")

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"ok":`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSON,
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationFailed || res.IsValid {
		t.Fatalf("expected failed/invalid, got status=%q valid=%v", res.Status, res.IsValid)
	}
	if len(res.Errors) == 0 {
		t.Fatal("expected parse errors")
	}
}

func TestStandardValidatorJSONSchemaSuccess(t *testing.T) {
	tmp := t.TempDir()
	schemaPath := filepath.Join(tmp, "schema.json")
	if err := os.WriteFile(schemaPath, []byte(`{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["name"],
  "properties": {
    "name": {"type": "string"}
  }
}`), 0644); err != nil {
		t.Fatal(err)
	}

	v := NewStandardValidator(tmp)

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"name":"eris"}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     "schema.json",
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationPassed || !res.IsValid {
		t.Fatalf("expected passed/valid, got status=%q valid=%v", res.Status, res.IsValid)
	}
}

func TestStandardValidatorJSONSchemaNestedSchemaPathSuccess(t *testing.T) {
	tmp := t.TempDir()
	nestedDir := filepath.Join(tmp, "dnd")
	if err := os.MkdirAll(nestedDir, 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(nestedDir, "schema.json"), []byte(`{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["name"],
  "properties": {
    "name": {"type": "string"}
  }
}`), 0644); err != nil {
		t.Fatal(err)
	}

	v := NewStandardValidator(tmp)

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"name":"eris"}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     filepath.Join("dnd", "schema.json"),
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationPassed || !res.IsValid {
		t.Fatalf("expected passed/valid, got status=%q valid=%v", res.Status, res.IsValid)
	}
}

func TestStandardValidatorJSONSchemaNestedSchemaPathMissing(t *testing.T) {
	v := NewStandardValidator(t.TempDir())

	_, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"name":"eris"}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     filepath.Join("dnd", "missing.json"),
	})
	if err == nil {
		t.Fatal("expected nested schema load error")
	}
}

func TestStandardValidatorJSONSchemaFailure(t *testing.T) {
	tmp := t.TempDir()
	schemaPath := filepath.Join(tmp, "schema.json")
	if err := os.WriteFile(schemaPath, []byte(`{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["name"],
  "properties": {
    "name": {"type": "string"}
  }
}`), 0644); err != nil {
		t.Fatal(err)
	}

	v := NewStandardValidator(tmp)

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"count":1}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     "schema.json",
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationFailed || res.IsValid {
		t.Fatalf("expected failed/invalid, got status=%q valid=%v", res.Status, res.IsValid)
	}
	if len(res.Errors) == 0 {
		t.Fatal("expected schema errors")
	}
}

func TestStandardValidatorJSONSchemaSchemaLoadError(t *testing.T) {
	v := NewStandardValidator(t.TempDir())

	_, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"name":"eris"}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     "missing.json",
	})
	if err == nil {
		t.Fatal("expected schema load error")
	}
}

func TestStandardValidatorLoadSchemaDocumentSuccess(t *testing.T) {
	tmp := t.TempDir()
	if err := os.WriteFile(filepath.Join(tmp, "schema.json"), []byte(`{
  "type": "object",
  "properties": {
    "name": {"type": "string"}
  }
}`), 0644); err != nil {
		t.Fatal(err)
	}

	v := NewStandardValidator(tmp)
	loader, ok := v.(SchemaDocumentLoader)
	if !ok {
		t.Fatal("standard validator must implement SchemaDocumentLoader")
	}

	doc, err := loader.LoadSchemaDocument(context.Background(), "schema.json")
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}

	obj, ok := doc.(map[string]any)
	if !ok {
		t.Fatalf("expected object document, got %#v", doc)
	}
	if obj["type"] != "object" {
		t.Fatalf("expected schema type=object, got %#v", obj["type"])
	}
}

func TestStandardValidatorLoadSchemaDocumentInvalidJSON(t *testing.T) {
	tmp := t.TempDir()
	if err := os.WriteFile(filepath.Join(tmp, "schema.json"), []byte(`{`), 0644); err != nil {
		t.Fatal(err)
	}

	v := NewStandardValidator(tmp)
	loader, ok := v.(SchemaDocumentLoader)
	if !ok {
		t.Fatal("standard validator must implement SchemaDocumentLoader")
	}

	_, err := loader.LoadSchemaDocument(context.Background(), "schema.json")
	if err == nil {
		t.Fatal("expected decode error")
	}
}

func TestFSValidatorJSONSchemaSuccess(t *testing.T) {
	v := NewFSValidator(fstest.MapFS{
		"schemas/events.schema.json": &fstest.MapFile{Data: []byte(`{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["events"],
  "properties": {
    "events": {"type": "array"}
  }
}`)},
	}, "schemas")

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"events":[]}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     "events.schema.json",
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationPassed || !res.IsValid {
		t.Fatalf("expected passed/valid, got status=%q valid=%v", res.Status, res.IsValid)
	}
}

func TestFSValidatorJSONSchemaPathContainment(t *testing.T) {
	t.Run("nested schema inside root succeeds", func(t *testing.T) {
		v := NewFSValidator(fstest.MapFS{
			"schemas/nested/events.schema.json": &fstest.MapFile{Data: []byte(`{
  "type": "object",
  "required": ["events"],
  "properties": {
    "events": {"type": "array"}
  }
}`)},
		}, "schemas")

		res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"events":[]}`)}, domain.OutputContract{
			ValidationMode: domain.ValidationJSONSchema,
			SchemaPath:     "nested/events.schema.json",
		})
		if err != nil {
			t.Fatalf("expected no error, got %v", err)
		}
		if res.Status != domain.ValidationPassed || !res.IsValid {
			t.Fatalf("expected passed/valid, got status=%q valid=%v", res.Status, res.IsValid)
		}
	})

	tests := []struct {
		name       string
		schemaPath string
		wantErr    string
	}{
		{name: "parent escape rejected", schemaPath: "../outside.schema.json", wantErr: "escapes source root"},
		{name: "absolute path rejected", schemaPath: "/outside.schema.json", wantErr: "must be relative"},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			v := NewFSValidator(fstest.MapFS{
				"schemas/events.schema.json":  &fstest.MapFile{Data: []byte(`{"type":"object"}`)},
				"outside.schema.json":         &fstest.MapFile{Data: []byte(`{"type":"object"}`)},
				"schemas/outside.schema.json": &fstest.MapFile{Data: []byte(`{"type":"object"}`)},
			}, "schemas")

			_, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"events":[]}`)}, domain.OutputContract{
				ValidationMode: domain.ValidationJSONSchema,
				SchemaPath:     tc.schemaPath,
			})
			if err == nil {
				t.Fatal("expected schema path error")
			}
			if !strings.Contains(err.Error(), tc.wantErr) {
				t.Fatalf("expected error to contain %q, got %v", tc.wantErr, err)
			}
		})
	}
}

func TestFSValidatorSingleSchemaFileUsesBaseName(t *testing.T) {
	v := NewFSValidator(fstest.MapFS{
		"events.schema.json": &fstest.MapFile{Data: []byte(`{
  "type": "object",
  "required": ["events"],
  "properties": {
    "events": {"type": "array"}
  }
}`)},
	}, "events.schema.json")

	res, err := v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"events":[]}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     "events.schema.json",
	})
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	if res.Status != domain.ValidationPassed || !res.IsValid {
		t.Fatalf("expected passed/valid, got status=%q valid=%v", res.Status, res.IsValid)
	}

	_, err = v.Validate(context.Background(), &domain.Artifact{Body: []byte(`{"events":[]}`)}, domain.OutputContract{
		ValidationMode: domain.ValidationJSONSchema,
		SchemaPath:     "other.schema.json",
	})
	if err == nil {
		t.Fatal("expected schema path mismatch error")
	}
}

func TestFSValidatorLoadSchemaDocument(t *testing.T) {
	v := NewFSValidator(fstest.MapFS{
		"schemas/schema.json": &fstest.MapFile{Data: []byte(`{"type":"object"}`)},
	}, "schemas")
	loader, ok := v.(SchemaDocumentLoader)
	if !ok {
		t.Fatal("fs validator must implement SchemaDocumentLoader")
	}

	doc, err := loader.LoadSchemaDocument(context.Background(), "schema.json")
	if err != nil {
		t.Fatalf("expected no error, got %v", err)
	}
	obj, ok := doc.(map[string]any)
	if !ok || obj["type"] != "object" {
		t.Fatalf("unexpected schema document: %#v", doc)
	}
}