// stalled_commands_test.go — stalled／xrefs CLI 接線層測試（#7）：
// 注入假 StalledSource，驗證 Run→dispatch→flagset 完整路徑，
// 不走網路（與 workflow_commands_test.go 同模式）。
package cli

import (
	"strings"
	"testing"
	"time"

	"gitea.alterminal.com/alterminal/teai/internal/gitea"
	"gitea.alterminal.com/alterminal/teai/internal/workflow"
)

// stubStalledSource 以記憶體資料實作 workflow.StalledSource。
type stubStalledSource struct {
	username string
	orgs     []string
	repos    map[string][]workflow.Repo
	issues   map[string]map[int64]workflow.Issue
	comments map[string][]workflow.Comment
	getErr   error
}

func (s *stubStalledSource) CurrentUser() (string, error) { return s.username, nil }
func (s *stubStalledSource) MyOrganizations() ([]string, error) {
	return s.orgs, nil
}
func (s *stubStalledSource) OrganizationRepositories(org string) ([]workflow.Repo, error) {
	return s.repos[org], nil
}
func (s *stubStalledSource) OpenIssues(owner, repo string) ([]workflow.Issue, error) {
	var out []workflow.Issue
	for _, i := range s.issues[owner+"/"+repo] {
		out = append(out, i)
	}
	return out, nil
}
func (s *stubStalledSource) OpenPulls(owner, repo string) ([]workflow.PullRequest, error) {
	return nil, nil
}
func (s *stubStalledSource) IssueComments(owner, repo string, number int64) ([]workflow.Comment, error) {
	return s.comments[owner+"/"+repo+"/"+itoa(number)], nil
}
func (s *stubStalledSource) TryGetIssue(owner, repo string, number int64) (workflow.Issue, bool, error) {
	i, ok := s.issues[owner+"/"+repo][number]
	return i, ok, nil
}
func (s *stubStalledSource) GetIssue(owner, repo string, number int64) (workflow.Issue, error) {
	if s.getErr != nil {
		return workflow.Issue{}, s.getErr
	}
	i, ok := s.issues[owner+"/"+repo][number]
	if !ok {
		return workflow.Issue{}, &gitea.ErrAPI{Op: "GET /repos/" + owner + "/" + repo + "/issues/" + itoa(number), StatusCode: 404}
	}
	return i, nil
}

func itoa(n int64) string {
	if n == 0 {
		return "0"
	}
	var b []byte
	for n > 0 {
		b = append([]byte{byte('0' + n%10)}, b...)
		n /= 10
	}
	return string(b)
}

// newStubStalledEnv 注入假資料源並固定時刻。
func newStubStalledEnv(t *testing.T, src *stubStalledSource, frozen time.Time) {
	t.Helper()
	origSrc, origNow := newStalledSourceFunc, nowFunc
	newStalledSourceFunc = func(env *Env) (workflow.StalledSource, error) { return src, nil }
	nowFunc = func() time.Time { return frozen }
	t.Cleanup(func() { newStalledSourceFunc, nowFunc = origSrc, origNow })
}

// isoAt 把相對分鐘轉成 ISO8601 字串（假資料用；錨點同 workflow 測試）。
func isoAt(minutes int) string {
	return workflow.FormatMoment(time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC).Add(time.Duration(minutes) * time.Minute))
}

// newStubStalledData 建構 stalled 情境：agents#1 停滯 10 小時（no-assignee）。
func newStubStalledData() *stubStalledSource {
	return &stubStalledSource{
		username: "ceo",
		orgs:     []string{"alterminal"},
		repos:    map[string][]workflow.Repo{"alterminal": {{Name: "agents"}}},
		issues: map[string]map[int64]workflow.Issue{
			"alterminal/agents": {
				1: {Number: 1, Title: "停滯項", State: "open",
					CreatedAt: isoAt(-600), UpdatedAt: isoAt(-600),
					Repository: &workflow.Repository{FullName: "alterminal/agents"}},
			},
		},
		comments: map[string][]workflow.Comment{},
	}
}

// TestWiringStalled 驗證 stalled 基本路徑：JSON 輸出含停滯欄位。
func TestWiringStalled(t *testing.T) {
	newStubStalledEnv(t, newStubStalledData(), time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	stdout, _, code := run("stalled")
	if code != 0 {
		t.Fatalf("stalled 應回 0，得到 %d（stdout=%q）", code, stdout)
	}
	for _, want := range []string{`"type": "issue"`, `"reason": "no-assignee"`, `"stalled_hours": 10.0`} {
		if !strings.Contains(stdout, want) {
			t.Fatalf("stalled 輸出應含 %q，得到：\n%s", want, stdout)
		}
	}
}

// TestWiringStalledHoursFlag 驗證 --hours 覆寫門檻與非正數被攔。
func TestWiringStalledHoursFlag(t *testing.T) {
	freeze := time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC)
	newStubStalledEnv(t, newStubStalledData(), freeze)
	// 門檻 20h → 10h 停滯未過門檻 → 空陣列。
	stdout, _, code := run("stalled", "--hours", "20")
	if code != 0 {
		t.Fatalf("stalled --hours 20 應回 0，得到 %d", code)
	}
	if strings.TrimSpace(stdout) != "[]" {
		t.Fatalf("無停滯項應輸出 []，得到 %q", stdout)
	}
	// 非正數 → exit 2。
	_, stderr, code := run("stalled", "--hours", "-1")
	if code != int(ExitUsage) {
		t.Fatalf("stalled --hours -1 應回 ExitUsage(%d)，得到 %d（stderr=%q）", int(ExitUsage), code, stderr)
	}
	// 位置參數 → exit 2。
	_, _, code = run("stalled", "extra")
	if code != int(ExitUsage) {
		t.Fatalf("stalled extra 應回 ExitUsage(%d)，得到 %d", int(ExitUsage), code)
	}
}

// TestWiringStalledTable 驗證 table 輸出（README 範例）。
func TestWiringStalledTable(t *testing.T) {
	newStubStalledEnv(t, newStubStalledData(), time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	stdout, _, code := run("stalled", "--output", "table")
	if code != 0 {
		t.Fatalf("stalled --output table 應回 0，得到 %d", code)
	}
	for _, want := range []string{"reason", "no-assignee", "停滯項"} {
		if !strings.Contains(stdout, want) {
			t.Fatalf("table 輸出應含 %q，得到：\n%s", want, stdout)
		}
	}
}

// TestWiringXrefs 驗證 xrefs 解析輸出（含 body／comment 出處）。
func TestWiringXrefs(t *testing.T) {
	src := newStubStalledData()
	src.issues["alterminal/agents"][1] = workflow.Issue{
		Number: 1, Title: "父項", State: "open",
		Body: "子項：agents#2",
		Repository: &workflow.Repository{FullName: "alterminal/agents"},
	}
	src.issues["alterminal/agents"][2] = workflow.Issue{
		Number: 2, Title: "子項", State: "open",
		Repository: &workflow.Repository{FullName: "alterminal/agents"},
	}
	src.comments["alterminal/agents/1"] = []workflow.Comment{
		{Body: "看 agents#2", User: &workflow.User{UserName: "alex"}},
	}
	newStubStalledEnv(t, src, time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	stdout, _, code := run("xrefs", "alterminal/agents", "1")
	if code != 0 {
		t.Fatalf("xrefs 應回 0，得到 %d（stdout=%q）", code, stdout)
	}
	// Printer JSON 為單行緊湊格式（無縮排）；命令清單類輸出一律如此。
	for _, want := range []string{`"repo":"agents"`, `"number":2`, `"source":"body"`} {
		if !strings.Contains(stdout, want) {
			t.Fatalf("xrefs 輸出應含 %q，得到：\n%s", want, stdout)
		}
	}
}

// TestWiringXrefsEmpty 驗證無引用 → []。
func TestWiringXrefsEmpty(t *testing.T) {
	src := newStubStalledData()
	src.issues["alterminal/agents"][1] = workflow.Issue{
		Number: 1, Title: "無引用", State: "open",
		Body: "沒有任何引用",
		Repository: &workflow.Repository{FullName: "alterminal/agents"},
	}
	newStubStalledEnv(t, src, time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	stdout, _, code := run("xrefs", "alterminal/agents", "1")
	if code != 0 {
		t.Fatalf("xrefs 應回 0，得到 %d", code)
	}
	if strings.TrimSpace(stdout) != "[]" {
		t.Fatalf("無引用應輸出 []，得到 %q", stdout)
	}
}

// TestWiringXrefsUsage 驗證參數不足／格式錯誤 → exit 2。
func TestWiringXrefsUsage(t *testing.T) {
	newStubStalledEnv(t, newStubStalledData(), time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	if _, _, code := run("xrefs"); code != int(ExitUsage) {
		t.Fatalf("xrefs 無參數應回 ExitUsage，得到 %d", code)
	}
	if _, _, code := run("xrefs", "alterminal/agents"); code != int(ExitUsage) {
		t.Fatalf("xrefs 缺編號應回 ExitUsage，得到 %d", code)
	}
	if _, _, code := run("xrefs", "not-a-repo", "1"); code != int(ExitUsage) {
		t.Fatalf("xrefs repo 格式錯誤應回 ExitUsage，得到 %d", code)
	}
	if _, _, code := run("xrefs", "alterminal/agents", "abc"); code != int(ExitUsage) {
		t.Fatalf("xrefs 編號非數字應回 ExitUsage，得到 %d", code)
	}
}

// TestWiringXrefsNotFound 驗證 404 → exit 3（API 錯誤）。
func TestWiringXrefsNotFound(t *testing.T) {
	src := newStubStalledData()
	src.getErr = &gitea.ErrAPI{Op: "GET /repos/alterminal/agents/issues/99", StatusCode: 404}
	newStubStalledEnv(t, src, time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	_, stderr, code := run("xrefs", "alterminal/agents", "99")
	if code != int(ExitAPI) {
		t.Fatalf("xrefs 404 應回 ExitAPI(%d)，得到 %d（stderr=%q）", int(ExitAPI), code, stderr)
	}
}