package server

import (
	"crypto/rand"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	mocks "gitlab.com/unboundsoftware/apex-mocks"
)

func TestServer(t *testing.T) {
	type args struct {
		store  func(t *testing.T) StoreFunc
		url    string
		random io.Reader
	}
	type req struct {
		method string
		path   string
		body   string
	}
	tests := []struct {
		name        string
		args        args
		req         req
		wantStatus  int
		wantResp    string
		wantHeaders map[string]string
	}{
		{
			name: "unhandled path",
			args: args{},
			req: req{
				method: http.MethodPut,
				path:   "/missing",
				body:   "xyz",
			},
			wantStatus: 404,
			wantResp:   "404 page not found\n",
		},
		{
			name: "health",
			args: args{},
			req: req{
				method: http.MethodPut,
				path:   "/health",
				body:   "",
			},
			wantStatus: 200,
			wantResp:   "OK",
		},
		{
			name: "GET on /put",
			args: args{},
			req: req{
				method: http.MethodGet,
				path:   "/put/some/file",
				body:   "abc",
			},
			wantStatus: 400,
			wantResp:   "This endpoint requires PUT",
		},
		{
			name: "OPTIONS on /put",
			args: args{},
			req: req{
				method: http.MethodOptions,
				path:   "/put/some/file",
				body:   "abc",
			},
			wantStatus: 204,
			wantResp:   "",
			wantHeaders: map[string]string{
				"Access-Control-Allow-Origin":  "*",
				"Access-Control-Allow-Methods": "PUT,OPTIONS",
				"Access-Control-Allow-Headers": "Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With",
				"Access-Control-Max-Age":       "1728000",
			},
		},
		{
			name: "PUT on /put - error",
			args: args{
				store: func(t *testing.T) StoreFunc {
					return func(path string, content io.Reader) error {
						assert.Equal(t, "some/file", path)
						temp, err := io.ReadAll(content)
						assert.NoError(t, err)
						assert.Equal(t, "abc", string(temp))
						return fmt.Errorf("error")
					}
				},
			},
			req: req{
				method: http.MethodPut,
				path:   "/put/some/file",
				body:   "abc",
			},
			wantStatus: 500,
			wantResp:   "error storing object in bucket",
		},
		{
			name: "PUT on /put - success",
			args: args{
				store: func(t *testing.T) StoreFunc {
					return func(path string, content io.Reader) error {
						return nil
					}
				},
				url: "https://example.org",
			},
			req: req{
				method: http.MethodPut,
				path:   "/put/some/file",
				body:   "abc",
			},
			wantStatus: 200,
			wantResp:   "success",
			wantHeaders: map[string]string{
				"Access-Control-Expose-Headers": "X-File-URL",
				"X-File-URL":                    "https://example.org/some/file",
			},
		},
		{
			name: "GET on /upload",
			args: args{},
			req: req{
				method: http.MethodGet,
				path:   "/upload",
				body:   "abc",
			},
			wantStatus: 400,
			wantResp:   "This endpoint requires PUT",
		},
		{
			name: "OPTIONS on /upload",
			args: args{},
			req: req{
				method: http.MethodOptions,
				path:   "/upload",
				body:   "abc",
			},
			wantStatus: 204,
			wantResp:   "",
			wantHeaders: map[string]string{
				"Access-Control-Allow-Origin":  "*",
				"Access-Control-Allow-Methods": "PUT,OPTIONS",
				"Access-Control-Allow-Headers": "Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With",
				"Access-Control-Max-Age":       "1728000",
			},
		},
		{
			name: "PUT on /upload - error with random",
			args: args{
				random: strings.NewReader("too short"),
			},
			req: req{
				method: http.MethodPut,
				path:   "/upload",
				body:   "abc",
			},
			wantStatus: 500,
			wantResp:   "An error occurred",
		},
		{
			name: "PUT on /upload - error",
			args: args{
				store: func(t *testing.T) StoreFunc {
					return func(path string, content io.Reader) error {
						assert.Equal(t, "20211125/588b41ebf261820104615b83201c729bd16016d6e43649b28b0ef77d54ca5aaf8da0ce74ae3f20a4", path)
						temp, err := io.ReadAll(content)
						assert.NoError(t, err)
						assert.Equal(t, "abc", string(temp))
						return fmt.Errorf("error")
					}
				},
			},
			req: req{
				method: http.MethodPut,
				path:   "/upload",
				body:   "abc",
			},
			wantStatus: 500,
			wantResp:   "error storing object in bucket",
		},
		{
			name: "PUT on /upload - success",
			args: args{
				store: func(t *testing.T) StoreFunc {
					return func(path string, content io.Reader) error {
						return nil
					}
				},
				url: "https://example.org",
			},
			req: req{
				method: http.MethodPut,
				path:   "/upload",
				body:   "abc",
			},
			wantStatus: 200,
			wantResp:   "success",
			wantHeaders: map[string]string{
				"Access-Control-Expose-Headers": "X-File-URL",
				"X-File-URL":                    "https://example.org/20211125/588b41ebf261820104615b83201c729bd16016d6e43649b28b0ef77d54ca5aaf8da0ce74ae3f20a4",
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.args.random != nil {
				rand.Reader = tt.args.random
			} else {
				rand.Reader = strings.NewReader("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
			}
			logger := mocks.New()
			var store StoreFunc
			if tt.args.store != nil {
				store = tt.args.store(t)
			}
			server := New(store, tt.args.url, logger)
			server.(*Server).now = func() time.Time {
				return time.Date(2021, 11, 25, 7, 43, 12, 0, time.UTC)
			}
			recorder := httptest.NewRecorder()
			u, err := url.Parse(fmt.Sprintf("https://example.org%s", tt.req.path))
			require.NoError(t, err)
			server.ServeHTTP(recorder, &http.Request{
				Method: tt.req.method,
				URL:    u,
				Body:   io.NopCloser(strings.NewReader(tt.req.body)),
			})
			assert.Equal(t, tt.wantStatus, recorder.Code, "StatusCode")
			assert.Equal(t, tt.wantResp, recorder.Body.String(), "Body")
			for k, v := range tt.wantHeaders {
				assert.Equal(t, v, recorder.Header().Get(k), "Header")
			}
		})
	}
}

type StoreFunc func(path string, content io.Reader) error

func (f StoreFunc) Store(path string, content io.Reader) error {
	return f(path, content)
}