package apis_test

import (
	"database/sql"
	"errors"
	"fmt"
	"net/http"
	"strings"
	"testing"

	"github.com/labstack/echo/v5"
	"github.com/pocketbase/pocketbase/apis"
	"github.com/pocketbase/pocketbase/tests"
	"github.com/spf13/cast"
)

func Test404(t *testing.T) {
	scenarios := []tests.ApiScenario{
		{
			Method:          http.MethodGet,
			Url:             "/api/missing",
			ExpectedStatus:  404,
			ExpectedContent: []string{`"data":{}`},
		},
		{
			Method:          http.MethodPost,
			Url:             "/api/missing",
			ExpectedStatus:  404,
			ExpectedContent: []string{`"data":{}`},
		},
		{
			Method:          http.MethodPatch,
			Url:             "/api/missing",
			ExpectedStatus:  404,
			ExpectedContent: []string{`"data":{}`},
		},
		{
			Method:          http.MethodDelete,
			Url:             "/api/missing",
			ExpectedStatus:  404,
			ExpectedContent: []string{`"data":{}`},
		},
		{
			Method:         http.MethodHead,
			Url:            "/api/missing",
			ExpectedStatus: 404,
		},
	}

	for _, scenario := range scenarios {
		scenario.Test(t)
	}
}

func TestCustomRoutesAndErrorsHandling(t *testing.T) {
	scenarios := []tests.ApiScenario{
		{
			Name:   "custom route",
			Method: http.MethodGet,
			Url:    "/custom",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/custom",
					Handler: func(c echo.Context) error {
						return c.String(200, "test123")
					},
				})
			},
			ExpectedStatus:  200,
			ExpectedContent: []string{"test123"},
		},
		{
			Name:   "custom route with url encoded parameter",
			Method: http.MethodGet,
			Url:    "/a%2Bb%2Bc",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/:param",
					Handler: func(c echo.Context) error {
						return c.String(200, c.PathParam("param"))
					},
				})
			},
			ExpectedStatus:  200,
			ExpectedContent: []string{"a+b+c"},
		},
		{
			Name:   "route with HTTPError",
			Method: http.MethodGet,
			Url:    "/http-error",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/http-error",
					Handler: func(c echo.Context) error {
						return echo.ErrBadRequest
					},
				})
			},
			ExpectedStatus:  400,
			ExpectedContent: []string{`{"code":400,"message":"Bad Request.","data":{}}`},
		},
		{
			Name:   "route with api error",
			Method: http.MethodGet,
			Url:    "/api-error",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/api-error",
					Handler: func(c echo.Context) error {
						return apis.NewApiError(500, "test message", errors.New("internal_test"))
					},
				})
			},
			ExpectedStatus:  500,
			ExpectedContent: []string{`{"code":500,"message":"Test message.","data":{}}`},
		},
		{
			Name:   "route with plain error",
			Method: http.MethodGet,
			Url:    "/plain-error",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/plain-error",
					Handler: func(c echo.Context) error {
						return errors.New("Test error")
					},
				})
			},
			ExpectedStatus:  400,
			ExpectedContent: []string{`{"code":400,"message":"Something went wrong while processing your request.","data":{}}`},
		},
	}

	for _, scenario := range scenarios {
		scenario.Test(t)
	}
}

func TestRemoveTrailingSlashMiddleware(t *testing.T) {
	scenarios := []tests.ApiScenario{
		{
			Name:   "non /api/* route (exact match)",
			Method: http.MethodGet,
			Url:    "/custom",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/custom",
					Handler: func(c echo.Context) error {
						return c.String(200, "test123")
					},
				})
			},
			ExpectedStatus:  200,
			ExpectedContent: []string{"test123"},
		},
		{
			Name:   "non /api/* route (with trailing slash)",
			Method: http.MethodGet,
			Url:    "/custom/",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/custom",
					Handler: func(c echo.Context) error {
						return c.String(200, "test123")
					},
				})
			},
			ExpectedStatus:  404,
			ExpectedContent: []string{`"data":{}`},
		},
		{
			Name:   "/api/* route (exact match)",
			Method: http.MethodGet,
			Url:    "/api/custom",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/api/custom",
					Handler: func(c echo.Context) error {
						return c.String(200, "test123")
					},
				})
			},
			ExpectedStatus:  200,
			ExpectedContent: []string{"test123"},
		},
		{
			Name:   "/api/* route (with trailing slash)",
			Method: http.MethodGet,
			Url:    "/api/custom/",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: http.MethodGet,
					Path:   "/api/custom",
					Handler: func(c echo.Context) error {
						return c.String(200, "test123")
					},
				})
			},
			ExpectedStatus:  200,
			ExpectedContent: []string{"test123"},
		},
	}

	for _, scenario := range scenarios {
		scenario.Test(t)
	}
}

func TestEagerRequestInfoCache(t *testing.T) {
	scenarios := []tests.ApiScenario{
		{
			Name:   "custom non-api group route",
			Method: "POST",
			Url:    "/custom",
			Body:   strings.NewReader(`{"name":"test123"}`),
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.AddRoute(echo.Route{
					Method: "POST",
					Path:   "/custom",
					Handler: func(c echo.Context) error {
						data := &struct {
							Name string `json:"name"`
						}{}

						if err := c.Bind(data); err != nil {
							return err
						}

						// since the unknown method is not eager cache support
						// it should fail reading the json body twice
						r := apis.RequestInfo(c)
						if v := cast.ToString(r.Data["name"]); v != "" {
							t.Fatalf("Expected empty request data body, got, %v", r.Data)
						}

						return c.NoContent(200)
					},
				})
			},
			ExpectedStatus: 200,
		},
		{
			Name:   "api group route with unsupported eager cache request method",
			Method: "GET",
			Url:    "/api/admins",
			Body:   strings.NewReader(`{"name":"test123"}`),
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
					return func(c echo.Context) error {
						// it is not important whether the route handler return an error since
						// we just need to ensure that the eagerRequestInfoCache was registered
						next(c)

						// ensure that the body was read at least once
						data := &struct {
							Name string `json:"name"`
						}{}
						c.Bind(data)

						// since the unknown method is not eager cache support
						// it should fail reading the json body twice
						r := apis.RequestInfo(c)
						if v := cast.ToString(r.Data["name"]); v != "" {
							t.Fatalf("Expected empty request data body, got, %v", r.Data)
						}

						return nil
					}
				})
			},
			ExpectedStatus: 200,
		},
		{
			Name:   "api group route with supported eager cache request method",
			Method: "POST",
			Url:    "/api/admins",
			Body:   strings.NewReader(`{"name":"test123"}`),
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
					return func(c echo.Context) error {
						// it is not important whether the route handler return an error since
						// we just need to ensure that the eagerRequestInfoCache was registered
						next(c)

						// ensure that the body was read at least once
						data := &struct {
							Name string `json:"name"`
						}{}
						c.Bind(data)

						// try to read the body again
						r := apis.RequestInfo(c)
						if v := cast.ToString(r.Data["name"]); v != "test123" {
							t.Fatalf("Expected request data with name %q, got, %q", "test123", v)
						}

						return nil
					}
				})
			},
			ExpectedStatus: 200,
		},
	}

	for _, scenario := range scenarios {
		scenario.Test(t)
	}
}

func TestErrorHandler(t *testing.T) {
	scenarios := []tests.ApiScenario{
		{
			Name:   "apis.ApiError",
			Method: http.MethodGet,
			Url:    "/test",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.GET("/test", func(c echo.Context) error {
					return apis.NewApiError(418, "test", nil)
				})
			},
			ExpectedStatus:  418,
			ExpectedContent: []string{`"message":"Test."`},
		},
		{
			Name:   "wrapped apis.ApiError",
			Method: http.MethodGet,
			Url:    "/test",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.GET("/test", func(c echo.Context) error {
					return fmt.Errorf("example 123: %w", apis.NewApiError(418, "test", nil))
				})
			},
			ExpectedStatus:     418,
			ExpectedContent:    []string{`"message":"Test."`},
			NotExpectedContent: []string{"example", "123"},
		},
		{
			Name:   "echo.HTTPError",
			Method: http.MethodGet,
			Url:    "/test",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.GET("/test", func(c echo.Context) error {
					return echo.NewHTTPError(418, "test")
				})
			},
			ExpectedStatus:  418,
			ExpectedContent: []string{`"message":"Test."`},
		},
		{
			Name:   "wrapped echo.HTTPError",
			Method: http.MethodGet,
			Url:    "/test",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.GET("/test", func(c echo.Context) error {
					return fmt.Errorf("example 123: %w", echo.NewHTTPError(418, "test"))
				})
			},
			ExpectedStatus:     418,
			ExpectedContent:    []string{`"message":"Test."`},
			NotExpectedContent: []string{"example", "123"},
		},
		{
			Name:   "wrapped sql.ErrNoRows",
			Method: http.MethodGet,
			Url:    "/test",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.GET("/test", func(c echo.Context) error {
					return fmt.Errorf("example 123: %w", sql.ErrNoRows)
				})
			},
			ExpectedStatus:     404,
			ExpectedContent:    []string{`"data":{}`},
			NotExpectedContent: []string{"example", "123"},
		},
		{
			Name:   "custom error",
			Method: http.MethodGet,
			Url:    "/test",
			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
				e.GET("/test", func(c echo.Context) error {
					return fmt.Errorf("example 123")
				})
			},
			ExpectedStatus:     400,
			ExpectedContent:    []string{`"data":{}`},
			NotExpectedContent: []string{"example", "123"},
		},
	}

	for _, scenario := range scenarios {
		scenario.Test(t)
	}
}