package resolution

import (
	"strings"
	"testing"

	mcat "git.novox.be/novox/mesh-sdk/go/catalogue"
)

func fileNamed(out []map[string]any, id string) map[string]any {
	for _, r := range out {
		if r["id"] == id {
			return r
		}
	}
	return nil
}

// A module's own credential, put into a file it wrote: the value sealed to the node, or, in a composition asked ahead of
// the send or for a plan alone, the stand-in its own file has (issue 774: baserow's config.json refused ace's plans).
func TestAFileGetsTheSecretItsContentAsksFor(t *testing.T) {
	for _, row := range []struct {
		name string
		with mcat.Rendering
		want string
	}{
		{"sealed", mcat.Rendering{Needed: map[string]map[string]string{"gitea": {"admin": "sealed-admin"}}}, "sealed-admin"},
		{"foreseen", mcat.Rendering{Foreseen: map[string]map[string]bool{"gitea": {"admin": true}}}, mcat.ForeseenSealed},
	} {
		r := mcat.Resolution{Node: "anchor", Modules: []mcat.Manifest{{
			Module:     "gitea",
			OwnSecrets: mcat.OwnSecrets{"admin": {Path: "/var/lib/gitea/admin.env"}},
			Resources: []map[string]any{{
				"id": "conf", "type": "file", "path": "/etc/gitea/app.ini",
				"content": "[security]\nSECRET_KEY = ${secret:admin}\n",
			}},
		}}}
		out, err := Declaration(r, row.with)
		if err != nil {
			t.Fatalf("%s: %v", row.name, err)
		}
		file := fileNamed(out, "gitea.conf")
		if file == nil {
			t.Fatalf("%s: no file in %v", row.name, out)
		}
		got, _ := file["secrets"].(map[string]any)
		if got["admin"] != row.want {
			t.Errorf("%s: the file was sent without its secret: %v", row.name, file)
		}
		// The hole is still a hole on the wire. The mesh does not fill it in; the host does, on the
		// machine, which is the only place both halves exist.
		if !strings.Contains(file["content"].(string), "${secret:admin}") {
			t.Errorf("%s: the mesh substituted it itself: %v", row.name, file["content"])
		}
	}
}

// The gap this exists for: a granted credential arrives as a bare password, and the program that
// needs it reads KEY=value.
func TestAGrantedCredentialCanBeShapedIntoAnEnvFile(t *testing.T) {
	r := mcat.Resolution{
		Node: "anchor",
		Modules: []mcat.Manifest{{
			Module:   "keycloak",
			Requires: []string{"postgres-database"},
			Secrets:  map[string]string{"postgres-database": "/var/lib/keycloak/db.secret"},
			Resources: []map[string]any{{
				"id": "dbenv", "type": "file", "path": "/var/lib/keycloak/database.env",
				"content": "KC_DB_USERNAME=keycloak\nKC_DB_PASSWORD=${secret:postgres-database}\n",
				"mode":    "0600",
			}},
		}},
		Needs: []mcat.Needed{{Name: "postgres-database", For: "keycloak", From: "anchor", Sealed: "sealed-db"}},
	}
	out, err := Declaration(r, mcat.Rendering{})
	if err != nil {
		t.Fatal(err)
	}
	file := fileNamed(out, "keycloak.dbenv")
	got, _ := file["secrets"].(map[string]any)
	if got["postgres-database"] != "sealed-db" {
		t.Errorf("the credential never reached the file it was needed in: %v", file)
	}
}

// Two modules on one node requiring the same provision each get THEIR OWN credential in a
// ${secret:…} file — not whichever need happened to come last. This is the placeholder-path twin of
// the guard novox/hq 04-ISSUES/022 put on the secrets:-map path; without it, a node with baserow and
// letta both consuming postgres gave baserow letta's password and authentication failed.
func TestTwoConsumersOfOneProvisionEachGetTheirOwnInAPlaceholderFile(t *testing.T) {
	r := mcat.Resolution{
		Node: "anchor",
		Modules: []mcat.Manifest{
			{
				Module:   "keycloak",
				Requires: []string{"postgres-database"},
				Secrets:  map[string]string{"postgres-database": "/var/lib/keycloak/db.secret"},
				Resources: []map[string]any{{
					"id": "dbenv", "type": "file", "path": "/var/lib/keycloak/database.env",
					"content": "PW=${secret:postgres-database}\n", "mode": "0600",
				}},
			},
			{
				Module:   "grafana",
				Requires: []string{"postgres-database"},
				Secrets:  map[string]string{"postgres-database": "/var/lib/grafana/db.secret"},
				Resources: []map[string]any{{
					"id": "dbenv", "type": "file", "path": "/var/lib/grafana/database.env",
					"content": "PW=${secret:postgres-database}\n", "mode": "0600",
				}},
			},
		},
		Needs: []mcat.Needed{
			{Name: "postgres-database", For: "keycloak", From: "anchor", Sealed: "sealed-kc"},
			{Name: "postgres-database", For: "grafana", From: "anchor", Sealed: "sealed-gf"},
		},
	}
	out, err := Declaration(r, mcat.Rendering{})
	if err != nil {
		t.Fatal(err)
	}
	kc, _ := fileNamed(out, "keycloak.dbenv")["secrets"].(map[string]any)
	if kc["postgres-database"] != "sealed-kc" {
		t.Errorf("keycloak got the wrong credential (someone else's password): %v", kc)
	}
	gf, _ := fileNamed(out, "grafana.dbenv")["secrets"].(map[string]any)
	if gf["postgres-database"] != "sealed-gf" {
		t.Errorf("grafana got the wrong credential (someone else's password): %v", gf)
	}
}

// A name nothing declared is a typo, and it is refused here rather than on the machine.
func TestAFileNamingASecretTheModuleDoesNotHaveIsRefused(t *testing.T) {
	r := mcat.Resolution{Node: "anchor", Modules: []mcat.Manifest{{
		Module:     "gitea",
		OwnSecrets: mcat.OwnSecrets{"admin": {Path: "/var/lib/gitea/admin.env"}},
		Resources: []map[string]any{{
			"id": "conf", "type": "file", "path": "/etc/gitea/app.ini",
			"content": "SECRET_KEY = ${secret:adnim}\n",
		}},
	}}}
	_, err := Declaration(r, mcat.Rendering{
		Needed: map[string]map[string]string{"gitea": {"admin": "sealed-admin"}},
	})
	if err == nil {
		t.Fatal("a file asked for a secret that does not exist and the mesh sent it anyway")
	}
	// It says what could have been meant, because the answer is nearly always one of two names.
	if !strings.Contains(err.Error(), `"admin"`) {
		t.Errorf("the refusal does not say what it could have named: %v", err)
	}
}

// One module may not read another's credential by guessing its name.
func TestAFileCannotNameAnotherModulesSecret(t *testing.T) {
	r := mcat.Resolution{Node: "anchor", Modules: []mcat.Manifest{
		{Module: "postgres", OwnSecrets: mcat.OwnSecrets{"superuser": {Path: "/var/lib/postgres/su.env"}}},
		{Module: "gitea", Resources: []map[string]any{{
			"id": "conf", "type": "file", "path": "/etc/gitea/app.ini",
			"content": "PASSWORD=${secret:superuser}\n",
		}}},
	}}
	_, err := Declaration(r, mcat.Rendering{Needed: map[string]map[string]string{
		"postgres": {"superuser": "sealed-su"},
	}})
	if err == nil {
		t.Fatal("gitea read postgres's credential by naming it")
	}
}

// A token inside a JSON document, where a setting put the placeholder there.
//
// **The case this whole shape was argued from**: a desktop client that reads its token from an
// attribute inside a JSON file in a home directory, not from an environment variable. The module
// ships an empty document, a setting says which attribute, and the credential never passes
// through the mesh in the open.
func TestASettingThatCarriesAPlaceholderIsStillFilled(t *testing.T) {
	r := mcat.Resolution{Node: "workstation", Modules: []mcat.Manifest{{
		Module:     "chat",
		OwnSecrets: mcat.OwnSecrets{"api-token": {Path: "/home/operator/.config/chat/token"}},
		Resources: []map[string]any{{
			"id": "settings", "type": "file", "merge": "json",
			"path": "/home/operator/.config/chat/settings.json", "content": "{}",
		}},
	}}}
	out, err := Declaration(r, mcat.Rendering{
		Needed: map[string]map[string]string{"chat": {"api-token": "sealed-token"}},
		Settings: mcat.SettingsBy{"chat": {{From: "node", Values: map[string]any{
			"chat.atlassian.token": "${secret:api-token}",
		}}}},
	})
	if err != nil {
		t.Fatal(err)
	}
	file := fileNamed(out, "chat.settings")
	got, _ := file["secrets"].(map[string]any)
	if got["api-token"] != "sealed-token" {
		t.Errorf("a placeholder a setting put there was never filled: %v", file)
	}
	// Filling secrets runs after settings for exactly this reason: before the merge, the content
	// is "{}" and asks for nothing at all.
	if !strings.Contains(file["content"].(string), "${secret:api-token}") {
		t.Errorf("the hole did not survive to the machine: %v", file["content"])
	}
}

// An own secret and a requirement of the same name would make ${secret:x} mean either.
func TestANameMeaningTwoThingsIsRefused(t *testing.T) {
	r := mcat.Resolution{
		Node: "anchor",
		Modules: []mcat.Manifest{{
			Module:     "thing",
			OwnSecrets: mcat.OwnSecrets{"store": {Path: "/var/lib/thing/own.env"}},
			Secrets:    map[string]string{"store": "/var/lib/thing/granted.env"},
		}},
		Needs: []mcat.Needed{{Name: "store", From: "anchor", Sealed: "sealed-granted"}},
	}
	_, err := Declaration(r, mcat.Rendering{
		Needed: map[string]map[string]string{"thing": {"store": "sealed-own"}},
	})
	if err == nil || !strings.Contains(err.Error(), "rename") {
		t.Errorf("one name meant two credentials and nothing said so: %v", err)
	}
}

// A file with no placeholder is not given a secrets map. The host refuses a secret its content
// never asks for, so an empty map added helpfully would break every file that has none.
func TestAFileWithNoPlaceholderIsLeftAlone(t *testing.T) {
	r := mcat.Resolution{Node: "anchor", Modules: []mcat.Manifest{{
		Module:     "gitea",
		OwnSecrets: mcat.OwnSecrets{"admin": {Path: "/var/lib/gitea/admin.env"}},
		Resources: []map[string]any{{
			"id": "conf", "type": "file", "path": "/etc/gitea/app.ini", "content": "RUN_MODE=prod\n",
		}},
	}}}
	out, err := Declaration(r, mcat.Rendering{
		Needed: map[string]map[string]string{"gitea": {"admin": "sealed-admin"}},
	})
	if err != nil {
		t.Fatal(err)
	}
	if _, given := fileNamed(out, "gitea.conf")["secrets"]; given {
		t.Error("a file that asks for nothing was given a secrets map, which the host refuses")
	}
}