// milestones_commands_test.go — 跨倉庫里程碑總覽的 CLI 接線層測試（#31）：
// 注入假 MilestoneSource，驗證 Run→dispatch→輸出完整路徑，不走網路
// （與 stalled_commands_test.go 同模式）。
package cli

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

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

// stubMilestoneSource 以記憶體資料實作 workflow.MilestoneSource。
type stubMilestoneSource struct {
	orgs       []string
	repos      map[string][]workflow.Repo
	milestones map[string][]workflow.Milestone
	openIssues map[string][]workflow.Issue // key: owner/repo?milestone=<title>
}

func (s *stubMilestoneSource) MyOrganizations() ([]string, error) { return s.orgs, nil }
func (s *stubMilestoneSource) OrganizationRepositories(org string) ([]workflow.Repo, error) {
	return s.repos[org], nil
}
func (s *stubMilestoneSource) OpenMilestones(owner, repo string) ([]workflow.Milestone, error) {
	return s.milestones[owner+"/"+repo], nil
}
func (s *stubMilestoneSource) MilestoneOpenIssues(owner, repo, title string) ([]workflow.Issue, error) {
	return s.openIssues[owner+"/"+repo+"?milestone="+title], nil
}

// newStubMilestoneEnv 注入假資料源並固定時刻。
func newStubMilestoneEnv(t *testing.T, src *stubMilestoneSource, frozen time.Time) {
	t.Helper()
	origSrc, origNow := newMilestoneSourceFunc, milestonesNowFunc
	newMilestoneSourceFunc = func(env *Env) (workflow.MilestoneSource, error) { return src, nil }
	milestonesNowFunc = func() time.Time { return frozen }
	t.Cleanup(func() {
		newMilestoneSourceFunc, milestonesNowFunc = origSrc, origNow
	})
}

// stubPullIssue 以 JSON 建構帶 pull_request 標記的條目（pullMarker 未匯出，
// 測試從套件外以 API 回應的形狀建構，走 Issue.UnmarshalJSON 同一路徑）。
func stubPullIssue(t *testing.T) workflow.Issue {
	t.Helper()
	var issue workflow.Issue
	err := json.Unmarshal([]byte(`{
		"number": 32, "title": "文件", "state": "open",
		"updated_at": "2026-09-08T00:00:00Z",
		"html_url": "https://gitea.alterminal.com/alterminal/agents/pulls/32",
		"user": {"username": "alex"},
		"pull_request": {}
	}`), &issue)
	if err != nil {
		t.Fatalf("建構 stub PR 條目失敗：%v", err)
	}
	return issue
}

// idPtr／msPtr 是測試用指標 helper（workflow 套件內同名函式未匯出）。
func idPtr(i int64) *int64   { return &i }
func msPtr(s string) *string { return &s }

// newStubMilestoneData 建構總覽情境：兩倉庫各一里程碑、一個未分派 PR。
func newStubMilestoneData(t *testing.T) *stubMilestoneSource {
	due := "2026-09-09T00:00:00Z"
	return &stubMilestoneSource{
		orgs: []string{"alterminal"},
		repos: map[string][]workflow.Repo{"alterminal": {
			{Name: "agents"}, {Name: "teai"},
		}},
		milestones: map[string][]workflow.Milestone{
			"alterminal/agents": {
				{ID: idPtr(7), Title: "MVP", State: "open",
					DueOn: &due, UpdatedAt: "2026-09-01T00:00:00Z",
					OpenIssues: 1, ClosedIssues: 0},
			},
			"alterminal/teai": {
				{ID: idPtr(3), Title: "CLI", State: "open",
					DueOn: msPtr("2026-09-12T00:00:00Z"), UpdatedAt: "2026-09-05T00:00:00Z",
					OpenIssues: 1, ClosedIssues: 2},
			},
		},
		openIssues: map[string][]workflow.Issue{
			"alterminal/agents?milestone=MVP": {stubPullIssue(t)},
		},
	}
}

// TestWiringMilestonesOverview 驗證 teai milestones 輸出跨倉庫總覽
// （JSON 縮排 2、鍵序與欄位齊 gitea.py）。
func TestWiringMilestonesOverview(t *testing.T) {
	newStubMilestoneEnv(t, newStubMilestoneData(t), time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	stdout, _, code := run("milestones")
	if code != 0 {
		t.Fatalf("milestones 應回 0，得到 %d（stdout=%q）", code, stdout)
	}
	for _, want := range []string{
		`"repo": "alterminal/agents"`,
		`"title": "MVP"`,
		`"overdue": true`,
		`"type": "pull"`,
		`"author": "alex"`,
	} {
		if !strings.Contains(stdout, want) {
			t.Fatalf("milestones 輸出應含 %q，得到：\n%s", want, stdout)
		}
	}
	// 排序：agents MVP（09-09）在 teai CLI（09-12）前。
	if strings.Index(stdout, `"title": "MVP"`) > strings.Index(stdout, `"title": "CLI"`) {
		t.Fatalf("期限近者應在前：\n%s", stdout)
	}
}

// TestWiringMilestonesEmpty 驗證無里程碑 → []（#26 慣例）。
func TestWiringMilestonesEmpty(t *testing.T) {
	newStubMilestoneEnv(t, &stubMilestoneSource{
		orgs:       []string{"alterminal"},
		repos:      map[string][]workflow.Repo{"alterminal": {{Name: "agents"}}},
		milestones: map[string][]workflow.Milestone{},
		openIssues: map[string][]workflow.Issue{},
	}, time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	stdout, _, code := run("milestones")
	if code != 0 {
		t.Fatalf("milestones 空清單應回 0，得到 %d", code)
	}
	if strings.TrimSpace(stdout) != "[]" {
		t.Fatalf("無里程碑應輸出 []，得到 %q", stdout)
	}
}

// TestWiringMilestonesTable 驗證 table 輸出（人工抽查用）。
func TestWiringMilestonesTable(t *testing.T) {
	newStubMilestoneEnv(t, newStubMilestoneData(t), time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	stdout, _, code := run("milestones", "--output", "table")
	if code != 0 {
		t.Fatalf("milestones --output table 應回 0，得到 %d", code)
	}
	for _, want := range []string{"repo", "overdue", "MVP", "alterminal/agents"} {
		if !strings.Contains(stdout, want) {
			t.Fatalf("table 輸出應含 %q，得到：\n%s", want, stdout)
		}
	}
}

// TestWiringMilestonesRepoFlagCompat 驗證 teai milestones --repo a/b
// 維持現行單倉庫 list 語義（#31：帶 --repo 時不變）。
func TestWiringMilestonesRepoFlagCompat(t *testing.T) {
	var gotPath, gotQuery string
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotPath, gotQuery = r.URL.Path, r.URL.RawQuery
		w.Write([]byte(`[{"title":"v1","state":"open","description":"","due_on":""}]`))
	}))
	t.Cleanup(srv.Close)
	stdout, _, code := run("--url", srv.URL, "milestones", "--repo", "a/b")
	if code != 0 {
		t.Fatalf("milestones --repo a/b 應回 0，得到 %d", code)
	}
	if gotPath != "/api/v1/repos/a/b/milestones" {
		t.Fatalf("應呼叫 /repos/a/b/milestones，得到 %s", gotPath)
	}
	if !strings.Contains(gotQuery, "state=open") {
		t.Fatalf("查詢應含 state=open，得到 %q", gotQuery)
	}
	if !strings.Contains(stdout, `"title":"v1"`) {
		t.Fatalf("輸出應含 title v1，得到：%s", stdout)
	}
}

// TestWiringMilestonesUsage 驗證未知子命令與位置參數 → exit 2。
func TestWiringMilestonesUsage(t *testing.T) {
	newStubMilestoneEnv(t, newStubMilestoneData(t), time.Date(2026, 9, 10, 8, 0, 0, 0, time.UTC))
	if _, _, code := run("milestones", "bogus"); code != int(ExitUsage) {
		t.Fatalf("milestones bogus 應回 ExitUsage，得到 %d", code)
	}
	if _, _, code := run("milestones", "extra", "arg"); code != int(ExitUsage) {
		t.Fatalf("milestones 位置參數應回 ExitUsage，得到 %d", code)
	}
	// milestones list 仍照舊要求 --repo。
	if _, _, code := run("milestones", "list"); code != int(ExitUsage) {
		t.Fatalf("milestones list 缺 --repo 應回 ExitUsage，得到 %d", code)
	}
}