package catalogue

import (
	"bytes"
	"encoding/json"
	"strings"
	"testing"
)

// A module declares its config (novox/hq ADR 0348 §1, §4, §5, §6, §8, §11; design 57 package K1, issue 660):
// one registration refusal per rule of design 57's K1, the old names read as aliases, and a module rewritten
// from settings to config composing byte-identically.

// inConfigForm is a module in the config form that registers: every value typed, described, defaulted or
// required, placed in a file or read at runtime, and its mergeable file naming its keys.
func inConfigForm() map[string]any {
	return map[string]any{
		"module":  "notifier",
		"version": "1",
		"config": map[string]any{
			"font-size": map[string]any{"type": "number", "description": "the notification's font size, in points",
				"minimum": 6, "maximum": 40, "default": 10},
			"width": map[string]any{"type": "number", "description": "the notification's width, in pixels",
				"default": 250},
			"position": map[string]any{"type": "string", "description": "the corner it shows in, a word",
				"enum": []any{"top-right", "top-left"}, "default": "top-right"},
			"theme": map[string]any{"type": "string", "description": "the colour theme, a lower-case name",
				"pattern": "[a-z]+", "default": "dark"},
			"history": map[string]any{"type": "number", "description": "how many notifications it keeps, a count",
				"default": 20, "runtime": true},
			"sender": map[string]any{"type": "string", "description": "the address it mails a digest from",
				"required": true},
		},
		"resources": []any{
			map[string]any{"id": "configuration", "type": "file", "path": "/x/notifierrc",
				"content": "font = Inter ${config:font-size}\nwidth = ${config:width}\nfrom = ${config:sender}\n"},
			map[string]any{"id": "rules", "type": "file", "path": "/x/rules.json", "merge": "json",
				"takes-config": []any{"position", "theme"}, "content": "{\"position\": \"top-right\"}\n"},
			map[string]any{"id": "notifier", "type": "service", "unit": "notifier.service",
				"reload-on": []any{"configuration"}, "restart-on": []any{"rules"}},
		},
	}
}

// declaration is one value of inConfigForm's config, to change in place.
func declaration(m map[string]any, key string) map[string]any {
	return m["config"].(map[string]any)[key].(map[string]any)
}

func resourceOf(m map[string]any, id string) map[string]any {
	for _, r := range m["resources"].([]any) {
		if r.(map[string]any)["id"] == id {
			return r.(map[string]any)
		}
	}
	return nil
}

func parseRaw(t *testing.T, m map[string]any) (Manifest, error) {
	t.Helper()
	raw, err := json.Marshal(m)
	if err != nil {
		t.Fatal(err)
	}
	return decodeForTest(raw)
}

// refused is that the manifest is refused with every one of these words.
func refused(t *testing.T, m map[string]any, words ...string) {
	t.Helper()
	_, err := parseRaw(t, m)
	if err == nil {
		t.Fatalf("registered; wanted a refusal saying %q", words)
	}
	for _, w := range words {
		if !strings.Contains(err.Error(), w) {
			t.Fatalf("refused without %q:\n%v", w, err)
		}
	}
}

func TestAModuleInTheConfigFormRegisters(t *testing.T) {
	m, err := parseRaw(t, inConfigForm())
	if err != nil {
		t.Fatal(err)
	}
	if !m.DeclaresConfig() {
		t.Fatal("a module declaring config is not read as in the config form")
	}
	d := m.Settings["font-size"]
	if d.Type != "number" || d.Description == "" || d.Minimum == nil || *d.Minimum != 6 || d.Default != float64(10) {
		t.Fatalf("font-size read as %+v", d)
	}
	if s := m.Settings["sender"]; !s.Required || s.Default != nil {
		t.Fatalf("sender read as %+v", s)
	}
}

// withPredefined is the list of predefined keys the mesh published, for the length of a test.
func withPredefined(t *testing.T, keys PredefinedList) {
	t.Helper()
	was := ReplacePublished(keys)
	t.Cleanup(func() { ReplacePublished(was) })
}

// What the mesh holds is what was written: a module in the config form is written back in it, and read again
// the same.
func TestAConfigManifestIsWrittenBackInItsOwnForm(t *testing.T) {
	m, err := parseRaw(t, inConfigForm())
	if err != nil {
		t.Fatal(err)
	}
	raw, err := json.Marshal(m)
	if err != nil {
		t.Fatal(err)
	}
	for _, said := range []string{`"config":`, `${config:font-size}`, `"takes-config":`, `"required":true`} {
		if !strings.Contains(string(raw), said) {
			t.Fatalf("written back without %s: %s", said, raw)
		}
	}
	for _, unsaid := range []string{`"settings":`, `${setting:`, `"takes-settings"`, `"kind"`, `"why"`, `"default":null`} {
		if strings.Contains(string(raw), unsaid) {
			t.Fatalf("written back with %s: %s", unsaid, raw)
		}
	}
	again, err := decodeForTest(raw)
	if err != nil {
		t.Fatal(err)
	}
	twice, _ := json.Marshal(again)
	if !bytes.Equal(raw, twice) {
		t.Fatalf("read again it is written\n%s\nwhere it was\n%s", twice, raw)
	}

	// The registry milestone's words round-trip the same (design 32): a config value's old name, an artifact's series
	// and contracts marker, the series a module accepts of a package; absent, a series is 0.1.
	declared := []byte(`{"module":"c","version":"1","config":{"font":{"type":"string","renamed-from":"font-name"}},
		"packages":{"mesh-sdk":"0.2"},
		"build":{"artifacts":[{"name":"go","kind":"package","language":"go","paths":["go"],"series":"0.2",
			"generated-from":"seats"},{"name":"lib","kind":"package","language":"typescript"}]}}`)
	m, err = decodeForTest(declared)
	if err != nil {
		t.Fatal(err)
	}
	if m.Settings["font"].RenamedFrom != "font-name" || m.AcceptedSeries("mesh-sdk") != "0.2" ||
		m.AcceptedSeries("mesh-contracts") != DefaultSeries || m.Build.Artifacts[0].SeriesOf() != "0.2" ||
		m.Build.Artifacts[0].GeneratedFrom != "seats" || m.Build.Artifacts[1].SeriesOf() != "0.1" {
		t.Fatalf("read %+v", m)
	}
	raw, _ = json.Marshal(m)
	for _, said := range []string{`"renamed-from":"font-name"`, `"packages":{"mesh-sdk":"0.2"}`, `"series":"0.2"`,
		`"generated-from":"seats"`} {
		if !strings.Contains(string(raw), said) {
			t.Errorf("written back without %s: %s", said, raw)
		}
	}
	if strings.Count(string(raw), `"series"`) != 1 {
		t.Errorf("a series nobody said is written: %s", raw)
	}
}

// A module in the settings form is written back byte for byte as before.
func TestASettingsManifestIsWrittenBackAsBefore(t *testing.T) {
	d := SettingDeclaration{Kind: KindPreference, Default: float64(10), Why: "readable"}
	raw, err := json.Marshal(d)
	if err != nil {
		t.Fatal(err)
	}
	if string(raw) != `{"kind":"preference","default":10,"why":"readable"}` {
		t.Fatalf("written as %s", raw)
	}
}

// 1658/AC1: a value whose only placement is ${config:key} in an item's text is placed.
func TestConfigCountsAnItemsTextAsAPlacement(t *testing.T) {
	m := map[string]any{
		"module": "m", "version": "1",
		"config": map[string]any{
			"k": map[string]any{"type": "string", "description": "a word the item says", "default": "x"},
		},
		"items": []any{map[string]any{"collection": "a", "content": "k = ${config:k}\n"}},
	}
	if _, err := parseRaw(t, m); err != nil {
		t.Fatalf("a value placed only in an item's text is refused: %v", err)
	}
}