package main

import (
	"net/http"
	"testing"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// TestOPDSEndpoints tests OPDS (Open Publication Distribution System) endpoints
func TestOPDSEndpoints(t *testing.T) {
	setup := setupTestServer(t)
	token := loginTestUser(t, setup.Server, setup.DB)
	_ = createTestMediaItemID(t, setup.Server, token)
	client := &http.Client{}

	t.Run("GetDeviceCatalog_WithoutDeviceAuth", func(t *testing.T) {
		deviceID := uuid.New()
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+deviceID.String()+"/catalog", nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// OPDS endpoints require device authentication via devices.auth_token
		assert.Equal(t, http.StatusUnauthorized, resp.StatusCode)
	})

	t.Run("GetDeviceCatalog_InvalidDeviceID", func(t *testing.T) {
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/invalid-uuid/catalog", nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should return 400 for invalid UUID
		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("GetDeviceCatalog_ValidDevice_BearerToken", func(t *testing.T) {
		// Create a device with auth token
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-bearer-test")

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/catalog", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should return 200 with catalog (even if empty)
		assert.Equal(t, http.StatusOK, resp.StatusCode)
	})

	t.Run("GetDeviceCatalog_ValidDevice_QueryToken", func(t *testing.T) {
		// Create a device with auth token
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "kobo", "opds-query-test")

		// Test query parameter authentication
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/catalog?token="+device.AuthToken, nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should return 200 with catalog (even if empty)
		assert.Equal(t, http.StatusOK, resp.StatusCode)
	})

	t.Run("SearchDeviceCatalog_InvalidDeviceID", func(t *testing.T) {
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/invalid-uuid/search?q=test", nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("SearchDeviceCatalog_ValidDevice", func(t *testing.T) {
		// Create a device with auth token
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-search-test")

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/search?q=test", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should return 200 (even if empty results)
		assert.Equal(t, http.StatusOK, resp.StatusCode)
	})

	t.Run("GetDeviceNavigation_InvalidDeviceID", func(t *testing.T) {
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/invalid-uuid/nav", nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("GetDeviceNavigation_ValidDevice", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-nav-test")

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/nav", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should return navigation or 404
		assert.True(t, resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusNotFound)
	})

	t.Run("DownloadBook_InvalidDeviceID", func(t *testing.T) {
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/invalid-uuid/download/"+uuid.New().String(), nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("DownloadBook_InvalidBookID", func(t *testing.T) {
		deviceID := uuid.New()
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+deviceID.String()+"/download/invalid-uuid", nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("DownloadBook_ValidIDs", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-download-test")
		bookID := createTestMediaItemID(t, setup.Server, token)

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/download/"+bookID, nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// May return 404 if device/book not linked, or 500 for file not found
		// Should not return 400 (invalid IDs)
		assert.NotEqual(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("GetCoverImage_InvalidDeviceID", func(t *testing.T) {
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/invalid-uuid/cover/"+uuid.New().String(), nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("GetCoverImage_InvalidBookID", func(t *testing.T) {
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/invalid-uuid/cover/"+uuid.New().String(), nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("GetCoverImage_ValidIDs", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-cover-test")
		bookID := createTestMediaItemID(t, setup.Server, token)

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/cover/"+bookID, nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// May return 404 if no cover, but not 400
		assert.NotEqual(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("ListFormats_InvalidDeviceID", func(t *testing.T) {
		bookID := uuid.New()
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/invalid-uuid/formats/"+bookID.String(), nil)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("ListFormats_ValidDeviceID", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-formats-test")
		bookID := createTestMediaItemID(t, setup.Server, token)

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/formats/"+bookID, nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should return formats list or 404
		assert.True(t, resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusNotFound)
	})
}

// TestOPDSConversion tests on-the-fly conversion for downloads
func TestOPDSConversion(t *testing.T) {
	setup := setupTestServer(t)
	token := loginTestUser(t, setup.Server, setup.DB)
	client := &http.Client{}

	t.Run("DownloadKEPUB_FormatParameter", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "kobo", "opds-kepub-test")
		bookID := createTestMediaItemID(t, setup.Server, token)

		// Request KEPUB format
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/download/"+bookID+"?format=kepub", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should attempt conversion (may fail if file doesn't exist)
		// Important: Should not return 400 for invalid IDs
		assert.NotEqual(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("DownloadEPUB_DefaultFormat", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-epub-test")
		bookID := createTestMediaItemID(t, setup.Server, token)

		// Request default format (no format parameter)
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/download/"+bookID, nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should attempt to download original format
		assert.NotEqual(t, http.StatusBadRequest, resp.StatusCode)
	})

	t.Run("Download_UnsupportedFormat", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-unsupported-test")
		bookID := createTestMediaItemID(t, setup.Server, token)

		// Request unsupported format
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/download/"+bookID+"?format=pdf", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should handle gracefully (either 400 for unsupported format or 404/500)
		assert.True(t, resp.StatusCode >= 400 && resp.StatusCode < 600)
	})
}

// TestOPDSEdgeCases tests edge cases for OPDS endpoints
func TestOPDSEdgeCases(t *testing.T) {
	setup := setupTestServer(t)
	token := loginTestUser(t, setup.Server, setup.DB)
	_ = token // Used for creating media items in device setup
	client := &http.Client{}

	t.Run("Catalog_EmptyLibrary", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-edge-empty")

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/catalog", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should return empty catalog, not error
		assert.Equal(t, http.StatusOK, resp.StatusCode)
	})

	t.Run("Search_SpecialCharacters", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-edge-special")

		// Search with special characters
		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/search?q=test%20%26%20more", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should handle special characters
		assert.Equal(t, http.StatusOK, resp.StatusCode)
	})

	t.Run("Search_EmptyQuery", func(t *testing.T) {
		deviceSetup := setupDeviceTest(t)
		device := deviceSetup.CreateDevice(t, "Test OPDS Device", "koreader", "opds-edge-emptyq")

		httpReq, _ := http.NewRequest("GET", setup.Server.URL+"/opds/devices/"+device.ID.String()+"/search?q=", nil)
		httpReq.Header.Set("Authorization", "Bearer "+device.AuthToken)

		resp, err := client.Do(httpReq)
		require.NoError(t, err)
		defer resp.Body.Close()

		// Should handle empty query
		assert.True(t, resp.StatusCode >= 200 && resp.StatusCode < 500)
	})
}