package queryapi_test

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

	queryapi "queryorchestration/api/queryAPI"
	"queryorchestration/internal/database/repository"
	"queryorchestration/internal/folder"
	"queryorchestration/internal/serviceconfig"
	"queryorchestration/internal/test"

	"github.com/google/uuid"
	"github.com/labstack/echo/v4"
	openapi_types "github.com/oapi-codegen/runtime/types"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

type FoldersTestConfig struct {
	serviceconfig.BaseConfig
}

func (c *FoldersTestConfig) GetBackgroundRunner() any { return nil }

func setupFoldersTestController(t *testing.T) (*queryapi.Controllers, *FoldersTestConfig, string) {
	t.Helper()
	cfg := &FoldersTestConfig{}
	test.CreateDB(t, cfg)

	// Create services
	folderSvc := folder.New(cfg)

	services := &queryapi.Services{
		Folder: folderSvc,
	}

	// Create test client with unique ID
	ctx := t.Context()
	uniqueID := uuid.New().String()[:8]
	clientID := fmt.Sprintf("test-client-%s", uniqueID)
	err := cfg.GetDBQueries().CreateClient(ctx, &repository.CreateClientParams{
		Clientid: clientID,
		Name:     fmt.Sprintf("Test Client %s", uniqueID),
	})
	require.NoError(t, err)

	ctrl := queryapi.NewControllers(services, nil)

	return ctrl, cfg, clientID
}

func TestCreateFolder_Success(t *testing.T) {
	ctrl, _, clientID := setupFoldersTestController(t)

	reqBody := queryapi.FolderCreate{
		Path:      "/documents/contracts",
		ClientId:  queryapi.ClientID(clientID),
		CreatedBy: openapi_types.Email("user@example.com"),
	}

	body, err := json.Marshal(reqBody)
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodPost, "/folders", bytes.NewReader(body))
	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.CreateFolder(c)
	require.NoError(t, err)
	assert.Equal(t, http.StatusCreated, rec.Code)

	// Parse response
	var resp queryapi.Folder
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	assert.Equal(t, "/documents/contracts", resp.Path)
	assert.Equal(t, clientID, string(resp.ClientId))
	assert.Equal(t, "user@example.com", string(resp.CreatedBy))
	assert.NotEqual(t, uuid.Nil, uuid.UUID(resp.Id))
}

func TestCreateFolder_WithParent(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create parent folder first
	parentFolder, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/documents",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	reqBody := queryapi.FolderCreate{
		Path:      "/documents/contracts",
		ClientId:  queryapi.ClientID(clientID),
		CreatedBy: openapi_types.Email("user@example.com"),
		ParentId:  (*openapi_types.UUID)(&parentFolder.ID),
	}

	body, err := json.Marshal(reqBody)
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodPost, "/folders", bytes.NewReader(body))
	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.CreateFolder(c)
	require.NoError(t, err)
	assert.Equal(t, http.StatusCreated, rec.Code)

	var resp queryapi.Folder
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	// Verify parent ID is set
	assert.True(t, resp.ParentId.IsSpecified())
	parentID, err := resp.ParentId.Get()
	require.NoError(t, err)
	assert.Equal(t, parentFolder.ID, uuid.UUID(parentID))
}

func TestCreateFolder_MissingPath(t *testing.T) {
	ctrl, _, clientID := setupFoldersTestController(t)

	reqBody := queryapi.FolderCreate{
		Path:      "",
		ClientId:  queryapi.ClientID(clientID),
		CreatedBy: openapi_types.Email("user@example.com"),
	}

	body, err := json.Marshal(reqBody)
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodPost, "/folders", bytes.NewReader(body))
	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.CreateFolder(c)
	require.Error(t, err)
	httpErr, ok := err.(*echo.HTTPError)
	require.True(t, ok)
	assert.Equal(t, http.StatusBadRequest, httpErr.Code)
}

func TestCreateFolder_MissingClientId(t *testing.T) {
	ctrl, _, _ := setupFoldersTestController(t)

	reqBody := queryapi.FolderCreate{
		Path:      "/documents",
		ClientId:  "",
		CreatedBy: openapi_types.Email("user@example.com"),
	}

	body, err := json.Marshal(reqBody)
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodPost, "/folders", bytes.NewReader(body))
	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.CreateFolder(c)
	require.Error(t, err)
	httpErr, ok := err.(*echo.HTTPError)
	require.True(t, ok)
	assert.Equal(t, http.StatusBadRequest, httpErr.Code)
}

func TestCreateFolder_MissingCreatedBy(t *testing.T) {
	ctrl, _, clientID := setupFoldersTestController(t)

	// Send raw JSON with empty createdBy field
	body := []byte(fmt.Sprintf(`{"path":"/documents","clientId":"%s","createdBy":""}`, clientID))

	e := echo.New()
	req := httptest.NewRequest(http.MethodPost, "/folders", bytes.NewReader(body))
	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err := ctrl.CreateFolder(c)
	require.Error(t, err)
	httpErr, ok := err.(*echo.HTTPError)
	require.True(t, ok)
	assert.Equal(t, http.StatusBadRequest, httpErr.Code)
}

func TestRenameFolder_Success(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create folder first
	folderRec, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/old-path",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	reqBody := queryapi.FolderRename{
		Path: "/new-path",
	}

	body, err := json.Marshal(reqBody)
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodPatch, fmt.Sprintf("/folders/%s", folderRec.ID), bytes.NewReader(body))
	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.RenameFolder(c, openapi_types.UUID(folderRec.ID))
	require.NoError(t, err)
	assert.Equal(t, http.StatusNoContent, rec.Code)

	// Verify the folder was renamed
	updatedFolder, err := cfg.GetDBQueries().GetFolderByID(ctx, folderRec.ID)
	require.NoError(t, err)
	assert.Equal(t, "/new-path", updatedFolder.Path)
}

func TestRenameFolder_MissingPath(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create folder first
	folderRec, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/old-path",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	reqBody := queryapi.FolderRename{
		Path: "",
	}

	body, err := json.Marshal(reqBody)
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodPatch, fmt.Sprintf("/folders/%s", folderRec.ID), bytes.NewReader(body))
	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.RenameFolder(c, openapi_types.UUID(folderRec.ID))
	require.Error(t, err)
	httpErr, ok := err.(*echo.HTTPError)
	require.True(t, ok)
	assert.Equal(t, http.StatusBadRequest, httpErr.Code)
}

func TestGetFolderDocuments_Success(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create folder
	folderRec, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/documents",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	// Create documents in the folder
	filename1 := "doc1.pdf"
	docID1, err := cfg.GetDBQueries().CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     fmt.Sprintf("hash1-%s", uuid.New().String()[:8]),
		Filename: &filename1,
		Folderid: &folderRec.ID,
	})
	require.NoError(t, err)

	filename2 := "doc2.pdf"
	docID2, err := cfg.GetDBQueries().CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     fmt.Sprintf("hash2-%s", uuid.New().String()[:8]),
		Filename: &filename2,
		Folderid: &folderRec.ID,
	})
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/folders/%s/documents", folderRec.ID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.GetFolderDocuments(c, openapi_types.UUID(folderRec.ID))
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp struct {
		Documents []queryapi.DocumentSummary `json:"documents"`
	}
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	assert.Len(t, resp.Documents, 2)

	// Verify both documents are returned
	docIDs := make(map[uuid.UUID]bool)
	for _, doc := range resp.Documents {
		docIDs[uuid.UUID(doc.Id)] = true
	}
	assert.True(t, docIDs[docID1])
	assert.True(t, docIDs[docID2])
}

func TestGetFolderDocuments_EmptyFolder(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create folder with no documents
	folderRec, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/empty-folder",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/folders/%s/documents", folderRec.ID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.GetFolderDocuments(c, openapi_types.UUID(folderRec.ID))
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp struct {
		Documents []queryapi.DocumentSummary `json:"documents"`
	}
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	assert.Len(t, resp.Documents, 0)
}

func TestGetFolderMetrics_Success(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create folder
	folderRec, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/documents",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	// Create documents in the folder
	filename1 := "doc1.pdf"
	docID1, err := cfg.GetDBQueries().CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     fmt.Sprintf("metricshash1-%s", uuid.New().String()[:8]),
		Filename: &filename1,
		Folderid: &folderRec.ID,
	})
	require.NoError(t, err)

	filename2 := "doc2.pdf"
	docID2, err := cfg.GetDBQueries().CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     fmt.Sprintf("metricshash2-%s", uuid.New().String()[:8]),
		Filename: &filename2,
		Folderid: &folderRec.ID,
	})
	require.NoError(t, err)

	filename3 := "doc3.pdf"
	_, err = cfg.GetDBQueries().CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     fmt.Sprintf("metricshash3-%s", uuid.New().String()[:8]),
		Filename: &filename3,
		Folderid: &folderRec.ID,
	})
	require.NoError(t, err)

	// Apply labels to documents (using labels from the lookup table)
	_, err = cfg.GetDBQueries().ApplyLabel(ctx, &repository.ApplyLabelParams{
		Documentid: docID1,
		Label:      "Ingested",
		Appliedby:  "user@example.com",
	})
	require.NoError(t, err)

	_, err = cfg.GetDBQueries().ApplyLabel(ctx, &repository.ApplyLabelParams{
		Documentid: docID2,
		Label:      "Ingested",
		Appliedby:  "user@example.com",
	})
	require.NoError(t, err)

	_, err = cfg.GetDBQueries().ApplyLabel(ctx, &repository.ApplyLabelParams{
		Documentid: docID2,
		Label:      "OCR_Processed",
		Appliedby:  "user@example.com",
	})
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/folders/%s/metrics", folderRec.ID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.GetFolderMetrics(c, openapi_types.UUID(folderRec.ID))
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp queryapi.FolderMetrics
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	assert.Equal(t, folderRec.ID, uuid.UUID(resp.FolderId))
	assert.Equal(t, int32(3), resp.TotalDocuments)
	assert.Equal(t, int32(2), resp.ByLabel["Ingested"])
	assert.Equal(t, int32(1), resp.ByLabel["OCR_Processed"])
}

func TestGetFolderMetrics_EmptyFolder(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create folder with no documents
	folderRec, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/empty-metrics",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/folders/%s/metrics", folderRec.ID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err = ctrl.GetFolderMetrics(c, openapi_types.UUID(folderRec.ID))
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp queryapi.FolderMetrics
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	assert.Equal(t, int32(0), resp.TotalDocuments)
	assert.Len(t, resp.ByLabel, 0)
}

func TestListClientFolders_Success(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create some folders for the client
	folder1, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/folder1",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	_, err = cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/folder1/subfolder",
		Clientid:  clientID,
		Parentid:  &folder1.ID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	_, err = cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/folder2",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/client/%s/folders", clientID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	// Call with empty params (metrics=false by default)
	err = ctrl.ListClientFolders(c, queryapi.ClientID(clientID), queryapi.ListClientFoldersParams{})
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp queryapi.FolderList
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	// Should have 3 folders
	assert.Len(t, resp.Folders, 3)

	// Folders should be ordered by path
	assert.Equal(t, "/folder1", resp.Folders[0].Path)
	assert.Equal(t, "/folder1/subfolder", resp.Folders[1].Path)
	assert.Equal(t, "/folder2", resp.Folders[2].Path)

	// Metrics should not be specified when metrics=false
	for _, f := range resp.Folders {
		assert.False(t, f.Metrics.IsSpecified(), "metrics should not be specified when metrics param is false/omitted")
	}
}

func TestListClientFolders_EmptyResult(t *testing.T) {
	ctrl, _, clientID := setupFoldersTestController(t)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/client/%s/folders", clientID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	err := ctrl.ListClientFolders(c, queryapi.ClientID(clientID), queryapi.ListClientFoldersParams{})
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp queryapi.FolderList
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	// Should have empty folders array
	assert.Len(t, resp.Folders, 0)
}

func TestListClientFolders_WithMetrics(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create a folder
	folderRec, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/metrics-folder",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	// Create documents in the folder
	filename1 := "doc1.pdf"
	docID1, err := cfg.GetDBQueries().CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     fmt.Sprintf("listmetricshash1-%s", uuid.New().String()[:8]),
		Filename: &filename1,
		Folderid: &folderRec.ID,
	})
	require.NoError(t, err)

	filename2 := "doc2.pdf"
	docID2, err := cfg.GetDBQueries().CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     fmt.Sprintf("listmetricshash2-%s", uuid.New().String()[:8]),
		Filename: &filename2,
		Folderid: &folderRec.ID,
	})
	require.NoError(t, err)

	// Apply labels
	_, err = cfg.GetDBQueries().ApplyLabel(ctx, &repository.ApplyLabelParams{
		Documentid: docID1,
		Label:      "Ingested",
		Appliedby:  "user@example.com",
	})
	require.NoError(t, err)

	_, err = cfg.GetDBQueries().ApplyLabel(ctx, &repository.ApplyLabelParams{
		Documentid: docID2,
		Label:      "Ingested",
		Appliedby:  "user@example.com",
	})
	require.NoError(t, err)

	_, err = cfg.GetDBQueries().ApplyLabel(ctx, &repository.ApplyLabelParams{
		Documentid: docID2,
		Label:      "OCR_Processed",
		Appliedby:  "user@example.com",
	})
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/client/%s/folders?metrics=true", clientID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	// Call with metrics=true
	metricsTrue := true
	err = ctrl.ListClientFolders(c, queryapi.ClientID(clientID), queryapi.ListClientFoldersParams{
		Metrics: &metricsTrue,
	})
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp queryapi.FolderList
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	// Should have 1 folder
	require.Len(t, resp.Folders, 1)

	// Metrics should be populated
	folder := resp.Folders[0]
	assert.True(t, folder.Metrics.IsSpecified(), "metrics should be specified when metrics=true")

	metricsVal, err := folder.Metrics.Get()
	require.NoError(t, err)
	assert.Equal(t, int32(2), metricsVal.TotalDocuments)
	assert.Equal(t, int32(2), metricsVal.ByLabel["Ingested"])
	assert.Equal(t, int32(1), metricsVal.ByLabel["OCR_Processed"])
}

func TestListClientFolders_MetricsFalseExplicit(t *testing.T) {
	ctrl, cfg, clientID := setupFoldersTestController(t)
	ctx := t.Context()

	// Create a folder
	_, err := cfg.GetDBQueries().CreateFolder(ctx, &repository.CreateFolderParams{
		Path:      "/no-metrics-folder",
		Clientid:  clientID,
		Createdby: "admin@example.com",
	})
	require.NoError(t, err)

	e := echo.New()
	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/client/%s/folders?metrics=false", clientID), nil)
	rec := httptest.NewRecorder()
	c := e.NewContext(req, rec)

	// Call with metrics=false explicitly
	metricsFalse := false
	err = ctrl.ListClientFolders(c, queryapi.ClientID(clientID), queryapi.ListClientFoldersParams{
		Metrics: &metricsFalse,
	})
	require.NoError(t, err)
	assert.Equal(t, http.StatusOK, rec.Code)

	var resp queryapi.FolderList
	err = json.Unmarshal(rec.Body.Bytes(), &resp)
	require.NoError(t, err)

	// Should have 1 folder
	require.Len(t, resp.Folders, 1)

	// Metrics should NOT be specified
	folder := resp.Folders[0]
	assert.False(t, folder.Metrics.IsSpecified(), "metrics should not be specified when metrics=false")
}