// Copyright © 2023 Roberto Hidalgo <event-gateway@un.rob.mx>
// SPDX-License-Identifier: Apache-2.0
package config_test

import (
	"strings"
	"testing"
	"testing/fstest"

	"git.rob.mx/nidito/event-gateway/internal/config"
	"git.rob.mx/nidito/event-gateway/internal/sink/debug"
	"git.rob.mx/nidito/event-gateway/internal/source/types"
)

func TestFileLoader(t *testing.T) {

	config.FS = fstest.MapFS{
		"empty-file.json": &fstest.MapFile{
			Data: []byte(`{}`),
		},
		"bad-source.json": &fstest.MapFile{
			Data: []byte(`{
				"bad": {
					"source": 42,
					"sink": {
						"kind": "debug"
					}
				}
			}`),
		},
		"no-sink.json": &fstest.MapFile{
			Data: []byte(`{
				"bad": {
					"source": {"kind": "http"}
				}
			}`),
		},
		"bad-sink.json": &fstest.MapFile{
			Data: []byte(`{
				"bad": {
					"source": {"kind": "http"},
					"sink": 42
				}
			}`),
		},
		"simple.json": &fstest.MapFile{
			Data: []byte(`{
				"simple": {
					"source": {
						"kind": "http",
						"path": "simple"
					},
					"sink": {
						"kind": "debug"
					}
				}
			}`),
		},
	}

	cases := []struct {
		Name     string
		Path     string
		Error    any
		Expected []*config.Listener
	}{
		{
			Name:     "empty-file",
			Path:     "empty-file.json",
			Expected: []*config.Listener{},
		},
		{
			Name:  "bad-source",
			Path:  "bad-source.json",
			Error: "could not unserialize bad-source.json as json: unable to decode {",
		},
		{
			Name:  "no-sink",
			Path:  "no-sink.json",
			Error: "could not unserialize no-sink.json as json: sink configuration not provided",
		},
		{
			Name:  "bad-sink",
			Path:  "bad-sink.json",
			Error: "could not unserialize bad-sink.json as json: sink configuration for {",
		},
		{
			Name: "simple",
			Path: "simple.json",
			Expected: []*config.Listener{
				{
					ID:     "simple",
					Source: &config.RawSource{Kind: types.HTTP},
					Event:  &debug.Event{},
					Hash:   "8SsF8PtGcr-5xE5iy8F1JES0ZoTQMdfmbw7iLLU3wik=",
				},
			},
		},
	}

	for _, c := range cases {
		t.Run(c.Name, func(t *testing.T) {
			l := &config.File{Path: c.Path}

			res, err := l.Load()
			if err != nil {
				if c.Error != nil {
					if errPrefix, ok := c.Error.(string); ok {
						if !strings.HasPrefix(err.Error(), errPrefix) {
							t.Fatalf("Unexpected error prefix, wanted %s, got %s", errPrefix, err)
						}
					} else if c.Error != err {
						t.Fatalf("Unexpected error, wanted %s, got %s", c.Error, err)
					}

					return
				}
			}

			if len(res) != len(c.Expected) {
				t.Fatalf("Unexpected results, wanted %+v, got %+v", c.Expected, res)
			}

			for idx, l := range c.Expected {
				m := res[idx]
				if l.ID != m.ID {
					t.Fatalf("Unexpected ID, wanted %s got %s", l.ID, m.ID)
				}

				if l.Hash != m.Hash {
					t.Fatalf("Unexpected hash, wanted %s got %s", l.Hash, m.Hash)
				}
			}
		})
	}
}