package main

// The commit and the reads act as the tools' own account (novox/hq ADR 0365 §2, issue 469): the token the module
// keeps for `mesh-tools`, never the admin login. That account is no repository's administrator, so the forge
// refuses it the protection rules (403, as gitea's reqAdmin does); the commit then judges an existing branch by the
// protection the forge says it applies, and leaves a branch not made yet to the forge's own judgement.

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"gitea/internal/forgehttp"
)

const toolsToken = "tools-token-never-shown"

// asTools serves the fake forge to a bundle holding the tools' token: only that token is taken, the rules are
// refused as to a non-administrator, and the branches named protected say so as the forge does.
func asTools(t *testing.T, f *fakeForge, protected map[string]string, scopes string) (*Forge, *[]string) {
	dir := t.TempDir()
	file := filepath.Join(dir, "token")
	if err := os.WriteFile(file, []byte(toolsToken+"\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(file+".scopes", []byte(scopes+"\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	var seen []string
	const repo = "/api/v1/repos/acme/app"
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		seen = append(seen, r.Method+" "+r.URL.Path)
		if _, _, basic := r.BasicAuth(); basic || r.Header.Get("Authorization") != "token "+toolsToken {
			http.Error(w, "unauthorized", 401)
			return
		}
		if r.URL.Path == repo+"/branch_protections" {
			http.Error(w, `{"message":"token does not have the administration of this repository"}`, 403)
			return
		}
		if name := strings.TrimPrefix(r.URL.Path, repo+"/branches/"); r.Method == "GET" && name != r.URL.Path {
			if rule, ok := protected[name]; ok {
				_, _ = w.Write([]byte(`{"name":"` + name + `","commit":{"id":"c0"},"protected":true,"effective_branch_protection_name":"` + rule + `"}`))
				return
			}
		}
		r.SetBasicAuth("mesh-admin", f.password) // the fake's own door, past the token checked above
		f.handle(w, r)
	}))
	t.Cleanup(srv.Close)
	return &Forge{Client: forgehttp.Client{URL: srv.URL, TokenFile: file, Account: "mesh-tools"}}, &seen
}

func TestTheToolsAccountCommitsOnANewBranchWithItsTokenThoughTheRulesAreNotItsToRead(t *testing.T) {
	f := newFake(t)
	forge, _ := asTools(t, f, nil, "read:user,write:issue,write:repository for mesh-tools")
	got, err := commit(context.Background(), forge, ask(t, map[string]any{"branch": "fix/365",
		"files": filesArg(map[string]any{"path": "x", "content": "x"})}))
	if err != nil {
		t.Fatal(err)
	}
	if len(f.writes) != 1 || !got.Created {
		t.Fatalf("%d writes, %+v", len(f.writes), got)
	}
}

func TestTheToolsAccountIsRefusedAProtectedBranchTheForgeSaysItGuardsAndTheDefaultBranch(t *testing.T) {
	for branch, rule := range map[string]string{"release/1.0": "release/*", "fix/1-old": "fix/1-old", "main": ""} {
		f := newFake(t)
		protected := map[string]string{}
		if rule != "" {
			protected[branch] = rule
		}
		forge, _ := asTools(t, f, protected, "read:user,write:issue,write:repository for mesh-tools")
		_, err := commit(context.Background(), forge, ask(t, map[string]any{"branch": branch,
			"files": filesArg(map[string]any{"path": "x", "content": "x"})}))
		if err == nil || !strings.Contains(err.Error(), "refused") || !strings.Contains(err.Error(), "ADR 0266") {
			t.Errorf("%s: %v", branch, err)
		}
		if rule != "" && !strings.Contains(err.Error(), rule) {
			t.Errorf("%s: the rule %s is not named: %v", branch, rule, err)
		}
		if len(f.writes)+len(f.patches) != 0 {
			t.Errorf("%s: something was written", branch)
		}
	}
}

func TestATokenKeptForTheAdministratorIsNeverSent(t *testing.T) {
	f := newFake(t)
	// What the module kept before ADR 0365: the admin's token, its scopes line naming no account.
	forge, seen := asTools(t, f, nil, "read:user,write:issue,write:repository")
	_, err := commit(context.Background(), forge, ask(t, map[string]any{"branch": "fix/365",
		"files": filesArg(map[string]any{"path": "x", "content": "x"})}))
	if err == nil || !strings.Contains(err.Error(), "not mesh-tools's") {
		t.Fatalf("%v", err)
	}
	if len(*seen) != 0 {
		t.Fatalf("the forge was asked %v", *seen)
	}
}

func TestTheBundleHandedATokenFileNeedsNoAdminLogin(t *testing.T) {
	t.Setenv("MESH_GITEA_URL", "http://127.0.0.1:3000")
	t.Setenv("MESH_GITEA_TOKEN_FILE", "/state/token")
	t.Setenv("MESH_GITEA_TOOLS_USER", "")
	t.Setenv("MESH_GITEA_ADMIN_USER", "")
	t.Setenv("MESH_GITEA_ADMIN_PASSWORD_FILE", "")
	f, err := ForgeFromEnv()
	if err != nil {
		t.Fatal(err)
	}
	if f.TokenFile != "/state/token" || f.Account != "mesh-tools" || f.User != "" || f.PasswordFile != "" {
		t.Fatalf("%+v", f.Client)
	}
}