package main

// release_test.go — the mirror-server REST API, against a recording stand-in.
//
// The three providers differ in path shape and field names, and those
// differences are invisible until a real server rejects the request. A fake
// server that records every request lets the differences be asserted directly —
// and covers authUser/repoExists/createRepo, which had no test at all.

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// recordedReq is one request the fake provider received.
type recordedReq struct {
	method, path, query string
	body                map[string]any
}

// fakeProvider stands in for a Gitea/GitHub/GitLab API. routes maps
// "METHOD /path" to a status code and JSON body; anything unrouted answers 404,
// which is what the "does it exist?" probes expect.
type fakeProvider struct {
	*httptest.Server
	got    []recordedReq
	routes map[string]struct {
		code int
		body string
	}
}

func newFakeProvider(t *testing.T) *fakeProvider {
	t.Helper()
	f := &fakeProvider{routes: map[string]struct {
		code int
		body string
	}{}}
	f.Server = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		rec := recordedReq{method: r.Method, path: r.URL.EscapedPath(), query: r.URL.RawQuery}
		if r.Body != nil {
			var m map[string]any
			json.NewDecoder(r.Body).Decode(&m)
			rec.body = m
		}
		f.got = append(f.got, rec)

		if route, ok := f.routes[r.Method+" "+r.URL.EscapedPath()]; ok {
			w.WriteHeader(route.code)
			w.Write([]byte(route.body))
			return
		}
		w.WriteHeader(http.StatusNotFound)
		w.Write([]byte(`{"message":"Not Found"}`))
	}))
	t.Cleanup(f.Close)
	return f
}

func (f *fakeProvider) route(methodPath string, code int, body string) {
	f.routes[methodPath] = struct {
		code int
		body string
	}{code, body}
}

// find returns the first recorded request for "METHOD /path", or nil.
func (f *fakeProvider) find(methodPath string) *recordedReq {
	for i, r := range f.got {
		if r.method+" "+r.path == methodPath {
			return &f.got[i]
		}
	}
	return nil
}

func (f *fakeProvider) paths() []string {
	var out []string
	for _, r := range f.got {
		out = append(out, r.method+" "+r.path)
	}
	return out
}

// TestCreateReleasePerProvider pins down the three API dialects: where the
// release collection lives, and what the notes field is called.
func TestCreateReleasePerProvider(t *testing.T) {
	rel := release{Tag: "v1.2", Name: "v1.2", Body: "- did a thing", Prerelease: false}

	cases := []struct {
		typ       string
		wantPath  string
		bodyField string // provider's name for the notes
	}{
		{"gitea", "/api/v1/repos/mike/mgsh/releases", "body"},
		{"github", "/api/v3/repos/mike/mgsh/releases", "body"},
		{"gitlab", "/api/v4/projects/mike%2Fmgsh/releases", "description"},
	}
	for _, c := range cases {
		f := newFakeProvider(t)
		f.route("POST "+c.wantPath, 201, `{"id":7}`)

		api := newRemoteAPI(f.URL, "tok", c.typ)
		if err := api.createRelease("mike", "mgsh", rel); err != nil {
			t.Fatalf("%s: createRelease: %v (requests: %v)", c.typ, err, f.paths())
		}

		req := f.find("POST " + c.wantPath)
		if req == nil {
			t.Fatalf("%s: expected POST %s, got %v", c.typ, c.wantPath, f.paths())
		}
		if req.body["tag_name"] != "v1.2" || req.body["name"] != "v1.2" {
			t.Errorf("%s: body = %v, want tag_name/name v1.2", c.typ, req.body)
		}
		if req.body[c.bodyField] != "- did a thing" {
			t.Errorf("%s: notes not in %q: %v", c.typ, c.bodyField, req.body)
		}
		// GitLab has no pre-release flag; the others must carry it
		if _, ok := req.body["prerelease"]; ok != (c.typ != "gitlab") {
			t.Errorf("%s: prerelease presence = %v, want %v", c.typ, ok, c.typ != "gitlab")
		}
	}
}

// TestFindReleaseAndUpdate covers the existing-release path: how each provider
// is asked whether a release for a tag exists, and how it is then rewritten.
func TestFindReleaseAndUpdate(t *testing.T) {
	cases := []struct {
		typ                string
		lookup, wantUpdate string
		wantMethod         string
	}{
		{"gitea", "/api/v1/repos/mike/mgsh/releases/tags/v1.2", "/api/v1/repos/mike/mgsh/releases/7", "PATCH"},
		{"github", "/api/v3/repos/mike/mgsh/releases/tags/v1.2", "/api/v3/repos/mike/mgsh/releases/7", "PATCH"},
		{"gitlab", "/api/v4/projects/mike%2Fmgsh/releases/v1.2", "/api/v4/projects/mike%2Fmgsh/releases/v1.2", "PUT"},
	}
	for _, c := range cases {
		f := newFakeProvider(t)
		f.route("GET "+c.lookup, 200, `{"id":7,"tag_name":"v1.2"}`)
		f.route(c.wantMethod+" "+c.wantUpdate, 200, `{}`)

		api := newRemoteAPI(f.URL, "tok", c.typ)
		id, found, err := api.findRelease("mike", "mgsh", "v1.2")
		if err != nil || !found {
			t.Fatalf("%s: findRelease = %q,%v,%v", c.typ, id, found, err)
		}
		if err := api.updateRelease("mike", "mgsh", id, release{Tag: "v1.2", Name: "v1.2", Body: "new"}); err != nil {
			t.Fatalf("%s: updateRelease: %v (requests: %v)", c.typ, err, f.paths())
		}
		req := f.find(c.wantMethod + " " + c.wantUpdate)
		if req == nil {
			t.Fatalf("%s: expected %s %s, got %v", c.typ, c.wantMethod, c.wantUpdate, f.paths())
		}
		// an update must not try to move the tag
		if _, ok := req.body["tag_name"]; ok {
			t.Errorf("%s: update sent tag_name: %v", c.typ, req.body)
		}
	}
}

// TestFindReleaseMissing: an absent release is "not found", not an error — that
// distinction decides between create and update.
func TestFindReleaseMissing(t *testing.T) {
	f := newFakeProvider(t) // everything 404s
	api := newRemoteAPI(f.URL, "tok", "gitea")
	id, found, err := api.findRelease("mike", "mgsh", "v9")
	if err != nil || found || id != "" {
		t.Fatalf("findRelease on empty server = %q,%v,%v", id, found, err)
	}
}

// TestFindReleaseServerError: anything else must surface, so a broken server is
// never mistaken for "no release yet" and silently re-created.
func TestFindReleaseServerError(t *testing.T) {
	f := newFakeProvider(t)
	f.route("GET /api/v1/repos/mike/mgsh/releases/tags/v1", 500, `{"message":"boom"}`)
	api := newRemoteAPI(f.URL, "tok", "gitea")
	if _, found, err := api.findRelease("mike", "mgsh", "v1"); err == nil || found {
		t.Fatalf("a 500 must be an error, got found=%v err=%v", found, err)
	}
}

// TestAuthUserAndRepoExists covers the calls pushremote has always made and
// that had no test: who the token belongs to, and whether the repo is there.
func TestAuthUserAndRepoExists(t *testing.T) {
	// Gitea/GitHub report "login", GitLab "username"
	for _, c := range []struct{ typ, root, field string }{
		{"gitea", "/api/v1", "login"},
		{"gitlab", "/api/v4", "username"},
	} {
		f := newFakeProvider(t)
		f.route("GET "+c.root+"/user", 200, `{"`+c.field+`":"mike"}`)
		api := newRemoteAPI(f.URL, "tok", c.typ)
		owner, err := api.authUser()
		if err != nil || owner != "mike" {
			t.Fatalf("%s: authUser = %q, %v", c.typ, owner, err)
		}
	}

	f := newFakeProvider(t)
	f.route("GET /api/v1/repos/mike/mgsh", 200, `{}`)
	api := newRemoteAPI(f.URL, "tok", "gitea")
	if ok, err := api.repoExists("mike", "mgsh"); err != nil || !ok {
		t.Errorf("repoExists(existing) = %v, %v", ok, err)
	}
	if ok, err := api.repoExists("mike", "gone"); err != nil || ok {
		t.Errorf("repoExists(missing) = %v, %v, want false,nil", ok, err)
	}

	// a bad token must be reported, not treated as "no such user"
	bad := newFakeProvider(t)
	bad.route("GET /api/v1/user", 401, `{"message":"token required"}`)
	if _, err := newRemoteAPI(bad.URL, "tok", "gitea").authUser(); err == nil {
		t.Error("authUser accepted a 401")
	}
}

// TestAuthHeaderReachesTheServer: each provider gets its own header form.
func TestAuthHeaderReachesTheServer(t *testing.T) {
	for _, c := range []struct{ typ, header, value string }{
		{"gitea", "Authorization", "token s3cret"},
		{"github", "Authorization", "Bearer s3cret"},
		{"gitlab", "PRIVATE-TOKEN", "s3cret"},
	} {
		var got http.Header
		srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			got = r.Header.Clone()
			w.Write([]byte(`{"login":"mike","username":"mike"}`))
		}))
		newRemoteAPI(srv.URL, "s3cret", c.typ).authUser()
		srv.Close()
		if got.Get(c.header) != c.value {
			t.Errorf("%s: %s = %q, want %q", c.typ, c.header, got.Get(c.header), c.value)
		}
	}
}

func TestPreReleaseDetection(t *testing.T) {
	pre := []string{"v1.0-rc1", "v1.0-RC.2", "v2-beta", "v2-alpha3", "1.0-pre"}
	final := []string{"v1.0", "v1.0.1", "2026-01-17", "v1.0-final", "release-1"}
	for _, s := range pre {
		if !preReleaseRe.MatchString(s) {
			t.Errorf("%q should be a pre-release", s)
		}
	}
	for _, s := range final {
		if preReleaseRe.MatchString(s) {
			t.Errorf("%q should not be a pre-release", s)
		}
	}
}

// TestReleaseNotesFromLog: without an annotation, the notes are the commits
// since the previous tag — not the whole history.
func TestReleaseNotesFromLog(t *testing.T) {
	dir := t.TempDir()
	mustGit(t, dir, "init", "-q")
	mustGit(t, dir, "config", "user.name", "t")
	mustGit(t, dir, "config", "user.email", "t@e")
	commit := func(msg string) {
		if err := os.WriteFile(filepath.Join(dir, "f"), []byte(msg), 0644); err != nil {
			t.Fatal(err)
		}
		mustGit(t, dir, "add", ".")
		mustGit(t, dir, "commit", "-q", "-m", msg)
	}
	commit("old work")
	mustGit(t, dir, "tag", "-a", "v1.0", "-m", "v1.0") // annotation == tag name
	commit("fix the thing")
	commit("add the other thing")
	mustGit(t, dir, "tag", "-a", "v1.1", "-m", "v1.1")

	notes := releaseNotes(dir, "v1.1")
	if !strings.Contains(notes, "- fix the thing") || !strings.Contains(notes, "- add the other thing") {
		t.Errorf("notes missing the new commits: %q", notes)
	}
	if strings.Contains(notes, "old work") {
		t.Errorf("notes reach back past the previous tag: %q", notes)
	}
	// the default annotation (= the tag name) must not become the body
	if strings.TrimSpace(notes) == "v1.1" {
		t.Errorf("notes fell back to the placeholder annotation: %q", notes)
	}

	// a real annotation wins over the log
	mustGit(t, dir, "tag", "-a", "v1.2", "-m", "Handpicked notes")
	if got := releaseNotes(dir, "v1.2"); got != "Handpicked notes" {
		t.Errorf("annotated notes = %q, want %q", got, "Handpicked notes")
	}
}

// TestEnsureTagRefusesToMoveATag: a published tag that would move is the one
// case where releasing must stop.
func TestEnsureTagRefusesToMoveATag(t *testing.T) {
	dir := t.TempDir()
	mustGit(t, dir, "init", "-q")
	mustGit(t, dir, "config", "user.name", "t")
	mustGit(t, dir, "config", "user.email", "t@e")
	mustGit(t, dir, "commit", "-q", "--allow-empty", "-m", "one")
	mustGit(t, dir, "tag", "-a", "v1", "-m", "v1")

	if !ensureTag(dir, "v1", "") {
		t.Error("re-publishing the same commit should be allowed")
	}
	if !ensureTag(dir, "v2", "notes here") {
		t.Fatal("ensureTag did not create a new tag")
	}
	if out, _ := gitCapture(dir, "tag", "-l", "--format=%(contents:subject)", "v2"); strings.TrimSpace(out) != "notes here" {
		t.Errorf("new tag annotation = %q, want %q", strings.TrimSpace(out), "notes here")
	}

	mustGit(t, dir, "commit", "-q", "--allow-empty", "-m", "two")
	if ensureTag(dir, "v1", "") {
		t.Error("ensureTag moved a tag that already points at another commit")
	}
}

// TestReleaseTagsAndPushesToOrigin drives the local half of `release` against a
// real bare origin: the tag is created with the given notes as its annotation
// and lands on the internal server, before any mirror is involved.
func TestReleaseTagsAndPushesToOrigin(t *testing.T) {
	dir := useProject(t, "proj")
	bare := filepath.Join(t.TempDir(), "origin.git")
	mustGit(t, "", "init", "--bare", "-q", bare)
	mustGit(t, dir, "init", "-q")
	mustGit(t, dir, "config", "user.name", "t")
	mustGit(t, dir, "config", "user.email", "t@e")
	mustGit(t, dir, "commit", "-q", "--allow-empty", "-m", "work")
	mustGit(t, dir, "remote", "add", "origin", bare)
	mustGit(t, dir, "push", "-q", "-u", "origin", "HEAD")

	cfg.Remotes = nil // no mirror targets: stop after the internal server

	runCommand("release v1.0 first public build")

	out, err := gitCapture(bare, "tag", "-l", "--format=%(refname:short) %(contents:subject)")
	if err != nil {
		t.Fatal(err)
	}
	if got := strings.TrimSpace(out); got != "v1.0 first public build" {
		t.Errorf("tag on origin = %q, want %q", got, "v1.0 first public build")
	}
}