// dailyops_commands.go — 日常操作命令的 CLI 接線（#8）：issues、pulls、
// labels、milestones、releases、repos、api（tea 對等指令）。
//
// 規則：
//   - 寫入類命令（create／close／comment／merge…）一律要求 --yes，
//     未帶 --yes 時不產生任何遠端變更（exit 2，用法錯誤）。
//   - `teai pulls` 相容 #6 的工作流用法（無子命令＝工作流清單 --mine/--reviewer）；
//     有子命令（list/create/view/merge/comment）時走日常操作。
//   - 輸出走 internal/gitea 的 Printer（--output json|table）。
package cli

import (
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"strconv"
	"strings"

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

func init() {
	register := func(c *command) { commands[c.name] = c }
	register(&command{name: "issues", usage: "issues 管理（list/view/create/close/comment）", run: runIssues})
	register(&command{name: "pulls", usage: "PR 管理（list/view/create/merge/comment；無子命令＝工作流清單）", run: runPullsDaily})
	register(&command{name: "labels", usage: "標籤管理（list/create）", run: runLabels})
	register(&command{name: "milestones", usage: "里程碑（跨倉庫總覽；list/create 管理單倉庫）", run: runMilestones})
	register(&command{name: "releases", usage: "發佈清單（list）", run: runReleases})
	register(&command{name: "repos", usage: "倉庫查詢（list）", run: runRepos})
	register(&command{name: "api", usage: "任意 API 呼叫（--method/--data；寫入動詞需 --yes）", run: runAPIDirect})
}

// requireYes 檢查寫入閘門：未帶 --yes 回 ErrUsage（exit 2），不觸發任何請求。
func requireYes(yes bool, what string) error {
	if !yes {
		return &ErrUsage{Msg: what + " 是寫入操作，需 --yes 明確確認（未確認，未產生任何遠端變更）"}
	}
	return nil
}

// splitRepoFlag 把 --repo owner/repo 拆成兩段；空值回 ("", "", nil)。
func splitRepoFlag(v string) (string, string, error) {
	if v == "" {
		return "", "", nil
	}
	parts := strings.SplitN(v, "/", 2)
	if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
		return "", "", &ErrUsage{Msg: errNoRepoFlag.Error()}
	}
	return parts[0], parts[1], nil
}

// newOpsClient 依全域選項建立 dailyops 用戶端。
func newOpsClient(env *Env) (*dailyops.Ops, error) {
	token, _, err := gitea.ResolveToken(gitea.AuthOptions{
		FlagToken:  env.Globals.Token,
		SiteURL:    env.Globals.URL,
		ConfigPath: env.Globals.ConfigPath,
	})
	if err != nil {
		return nil, err
	}
	client, err := gitea.New(env.Globals.URL, token, env.Globals.Timeout)
	if err != nil {
		return nil, err
	}
	return &dailyops.Ops{Client: client}, nil
}

// parseNumber 把位置參數解析為 issue／PR 編號。
func parseNumber(s string) (int64, error) {
	n, err := strconv.ParseInt(s, 10, 64)
	if err != nil || n <= 0 {
		return 0, &ErrUsage{Msg: fmt.Sprintf("無效的編號 %q", s)}
	}
	return n, nil
}

// joinOrEmpty 把清單型欄位格式化為逗號分隔（table 用）。
func joinOrEmpty(v any) string {
	switch x := v.(type) {
	case string:
		return x
	case []string:
		return strings.Join(x, ",")
	default:
		return fmt.Sprint(x)
	}
}

// issueRowsFields 是 issues 清單的欄位定義（與值順序對應）。
func issueListFields() []gitea.Field {
	return []gitea.Field{
		{Name: "number"}, {Name: "title"}, {Name: "state"},
		{Name: "author"}, {Name: "assignees", ValueFmt: joinOrEmpty}, {Name: "updated_at"},
	}
}

// ---- issues ----

// runIssues：teai issues [list|view|create|close|comment] …
func runIssues(env *Env, args []string) error {
	if len(args) == 0 {
		return &ErrUsage{Msg: "issues 需要子命令：list | view | create | close | comment"}
	}
	sub, rest := args[0], args[1:]
	switch sub {
	case "list":
		return runIssuesList(env, rest)
	case "view":
		return runIssuesView(env, rest)
	case "create":
		return runIssuesCreate(env, rest)
	case "close":
		return runIssuesClose(env, rest)
	case "comment":
		return runComment(env, rest, false)
	default:
		return &ErrUsage{Msg: fmt.Sprintf("issues 未知子命令 %q（可用：list | view | create | close | comment）", sub)}
	}
}

// runIssuesList：teai issues list --repo owner/repo [--state open|closed|all]
func runIssuesList(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai issues list", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	state := fs.String("state", "open", "狀態：open|closed|all")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	if fs.NArg() != 0 {
		return &ErrUsage{Msg: "issues list 不接受位置參數"}
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "issues list 需要 --repo owner/repo"}
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	issues, err := ops.ListIssues(context.Background(), owner, name, *state)
	if err != nil {
		return err
	}
	p := printer(env)
	rows := make([]gitea.Values, 0, len(issues))
	for i := range issues {
		it := &issues[i]
		rows = append(rows, gitea.Values{
			it.Number, it.Title, it.State, it.Author(),
			it.AssigneeNames(), it.UpdatedAt,
		})
	}
	return p.PrintList(issueListFields(), rows)
}

// runIssuesView：teai issues view --repo owner/repo <number> [--comments]
func runIssuesView(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai issues view", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	withComments := fs.Bool("comments", false, "連留言一起輸出")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "issues view 需要 --repo owner/repo"}
	}
	if fs.NArg() != 1 {
		return &ErrUsage{Msg: "issues view 需要恰好一個編號"}
	}
	num, err := parseNumber(fs.Arg(0))
	if err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	it, err := ops.GetIssue(context.Background(), owner, name, num)
	if err != nil {
		return err
	}
	p := printer(env)
	fields := []gitea.Field{
		{Name: "number"}, {Name: "title"}, {Name: "state"},
		{Name: "author"}, {Name: "assignees", ValueFmt: joinOrEmpty},
		{Name: "labels", ValueFmt: joinOrEmpty}, {Name: "body"},
		{Name: "url"}, {Name: "updated_at"},
	}
	row := gitea.Values{
		it.Number, it.Title, it.State, it.Author(),
		it.AssigneeNames(), it.LabelNames(), it.Body,
		it.HTMLURL, it.UpdatedAt,
	}
	if err := p.PrintOne(fields, row); err != nil {
		return err
	}
	if !*withComments {
		return nil
	}
	return printComments(env, ops, owner, name, num)
}

// printComments 輸出 issue／PR 的留言清單（view --comments 共用）。
func printComments(env *Env, ops *dailyops.Ops, owner, repo string, number int64) error {
	comments, err := ops.ListComments(context.Background(), owner, repo, number)
	if err != nil {
		return err
	}
	p := printer(env)
	rows := make([]gitea.Values, 0, len(comments))
	for i := range comments {
		c := &comments[i]
		rows = append(rows, gitea.Values{c.Author(), c.CreatedAt, c.Body})
	}
	return p.PrintList([]gitea.Field{
		{Name: "author"}, {Name: "created_at"}, {Name: "body"},
	}, rows)
}

// runIssuesCreate：teai issues create --repo owner/repo --title … [--body …] [--assignees a,b] --yes
func runIssuesCreate(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai issues create", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	title := fs.String("title", "", "標題（必填）")
	body := fs.String("body", "", "內文")
	assignees := fs.String("assignees", "", "assignees（逗號分隔，可選）")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "issues create 需要 --repo owner/repo"}
	}
	if strings.TrimSpace(*title) == "" {
		return &ErrUsage{Msg: "issues create 需要 --title"}
	}
	if err := requireYes(*yes, "issues create"); err != nil {
		return err
	}
	var assigneeList []string
	if strings.TrimSpace(*assignees) != "" {
		for _, a := range strings.Split(*assignees, ",") {
			if a = strings.TrimSpace(a); a != "" {
				assigneeList = append(assigneeList, a)
			}
		}
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	issue, err := ops.CreateIssue(context.Background(), owner, name, *title, *body, assigneeList)
	if err != nil {
		return err
	}
	return printer(env).PrintOne([]gitea.Field{
		{Name: "number"}, {Name: "title"}, {Name: "url"},
	}, gitea.Values{issue.Number, issue.Title, issue.HTMLURL})
}

// runIssuesClose：teai issues close --repo owner/repo <number> --yes
func runIssuesClose(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai issues close", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "issues close 需要 --repo owner/repo"}
	}
	if fs.NArg() != 1 {
		return &ErrUsage{Msg: "issues close 需要恰好一個編號"}
	}
	num, err := parseNumber(fs.Arg(0))
	if err != nil {
		return err
	}
	if err := requireYes(*yes, "issues close"); err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	issue, err := ops.SetIssueState(context.Background(), owner, name, num, "closed")
	if err != nil {
		return err
	}
	return printer(env).PrintOne([]gitea.Field{
		{Name: "number"}, {Name: "title"}, {Name: "state"}, {Name: "url"},
	}, gitea.Values{issue.Number, issue.Title, issue.State, issue.HTMLURL})
}

// runComment：teai issues comment / teai pulls comment 共用。
func runComment(env *Env, args []string, isPR bool) error {
	name := "issues comment"
	if isPR {
		name = "pulls comment"
	}
	fs := flag.NewFlagSet("teai "+name, flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	body := fs.String("body", "", "留言內容（必填）")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, rname, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: name + " 需要 --repo owner/repo"}
	}
	if strings.TrimSpace(*body) == "" {
		return &ErrUsage{Msg: name + " 需要 --body"}
	}
	if fs.NArg() != 1 {
		return &ErrUsage{Msg: name + " 需要恰好一個編號"}
	}
	num, err := parseNumber(fs.Arg(0))
	if err != nil {
		return err
	}
	if err := requireYes(*yes, name); err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	comment, err := ops.AddComment(context.Background(), owner, rname, num, *body)
	if err != nil {
		return err
	}
	return printer(env).PrintOne([]gitea.Field{
		{Name: "author"}, {Name: "created_at"}, {Name: "body"},
	}, gitea.Values{comment.Author(), comment.CreatedAt, comment.Body})
}

// ---- pulls ----

// runPullsDaily：teai pulls [list|view|create|merge|comment] …；
// 無子命令時沿用 #6 的工作流清單（teai pulls [--mine|--reviewer] [--repo]）。
func runPullsDaily(env *Env, args []string) error {
	if len(args) == 0 || strings.HasPrefix(args[0], "-") {
		// 相容 #6：teai pulls / teai pulls --mine …（工作流清單）。
		return runPulls(env, args)
	}
	sub, rest := args[0], args[1:]
	switch sub {
	case "list":
		return runPullsList(env, rest)
	case "view":
		return runPullsView(env, rest)
	case "create":
		return runPullsCreate(env, rest)
	case "merge":
		return runPullsMerge(env, rest)
	case "comment":
		return runComment(env, rest, true)
	default:
		return &ErrUsage{Msg: fmt.Sprintf("pulls 未知子命令 %q（可用：list | view | create | merge | comment；或無子命令＝工作流清單）", sub)}
	}
}

// runPullsList：teai pulls list --repo owner/repo [--state open|closed|all]
func runPullsList(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai pulls list", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	state := fs.String("state", "open", "狀態：open|closed|all")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "pulls list 需要 --repo owner/repo"}
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	pulls, err := ops.ListPulls(context.Background(), owner, name, *state)
	if err != nil {
		return err
	}
	p := printer(env)
	rows := make([]gitea.Values, 0, len(pulls))
	for i := range pulls {
		pr := &pulls[i]
		rows = append(rows, gitea.Values{
			pr.Number, pr.Title, pr.State, pr.Author(),
			pr.HeadRef(), pr.BaseRef(), pr.UpdatedAt,
		})
	}
	return p.PrintList([]gitea.Field{
		{Name: "number"}, {Name: "title"}, {Name: "state"},
		{Name: "author"}, {Name: "head"}, {Name: "base"}, {Name: "updated_at"},
	}, rows)
}

// runPullsView：teai pulls view --repo owner/repo <number> [--comments]
func runPullsView(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai pulls view", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	withComments := fs.Bool("comments", false, "連留言一起輸出")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "pulls view 需要 --repo owner/repo"}
	}
	if fs.NArg() != 1 {
		return &ErrUsage{Msg: "pulls view 需要恰好一個編號"}
	}
	num, err := parseNumber(fs.Arg(0))
	if err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	pr, err := ops.GetPull(context.Background(), owner, name, num)
	if err != nil {
		return err
	}
	p := printer(env)
	fields := []gitea.Field{
		{Name: "number"}, {Name: "title"}, {Name: "state"},
		{Name: "author"}, {Name: "head"}, {Name: "base"}, {Name: "body"},
		{Name: "url"}, {Name: "updated_at"},
	}
	row := gitea.Values{
		pr.Number, pr.Title, pr.State, pr.Author(),
		pr.HeadRef(), pr.BaseRef(), pr.Body, pr.HTMLURL, pr.UpdatedAt,
	}
	if err := p.PrintOne(fields, row); err != nil {
		return err
	}
	if !*withComments {
		return nil
	}
	return printComments(env, ops, owner, name, num)
}

// runPullsCreate：teai pulls create --repo owner/repo --head <branch> --base <branch> --title … [--body …] --yes
func runPullsCreate(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai pulls create", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	head := fs.String("head", "", "來源分支（必填）")
	base := fs.String("base", "main", "目標分支（預設 main）")
	title := fs.String("title", "", "標題（必填）")
	body := fs.String("body", "", "說明")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "pulls create 需要 --repo owner/repo"}
	}
	if *head == "" || *title == "" {
		return &ErrUsage{Msg: "pulls create 需要 --head 與 --title"}
	}
	if err := requireYes(*yes, "pulls create"); err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	pr, err := ops.CreatePull(context.Background(), owner, name, *title, *body, *head, *base)
	if err != nil {
		return err
	}
	return printer(env).PrintOne([]gitea.Field{
		{Name: "number"}, {Name: "title"}, {Name: "url"},
	}, gitea.Values{pr.Number, pr.Title, pr.HTMLURL})
}

// runPullsMerge：teai pulls merge --repo owner/repo <number> [--style merge|rebase|squash] --yes
func runPullsMerge(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai pulls merge", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	style := fs.String("style", "merge", "合併方式：merge|rebase|rebase-merge|squash")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "pulls merge 需要 --repo owner/repo"}
	}
	if fs.NArg() != 1 {
		return &ErrUsage{Msg: "pulls merge 需要恰好一個編號"}
	}
	num, err := parseNumber(fs.Arg(0))
	if err != nil {
		return err
	}
	switch *style {
	case "merge", "rebase", "rebase-merge", "squash":
	default:
		return &ErrUsage{Msg: "pulls merge 的 --style 需為 merge|rebase|rebase-merge|squash"}
	}
	if err := requireYes(*yes, "pulls merge"); err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	if err := ops.MergePull(context.Background(), owner, name, num, *style); err != nil {
		return err
	}
	return printer(env).PrintOne([]gitea.Field{
		{Name: "number"}, {Name: "state"},
	}, gitea.Values{num, "merged"})
}

// ---- labels ----

// runLabels：teai labels list --repo owner/repo｜teai labels create … --yes
func runLabels(env *Env, args []string) error {
	if len(args) == 0 {
		return &ErrUsage{Msg: "labels 需要子命令：list | create"}
	}
	sub, rest := args[0], args[1:]
	switch sub {
	case "list":
		return runLabelsList(env, rest)
	case "create":
		return runLabelsCreate(env, rest)
	default:
		return &ErrUsage{Msg: fmt.Sprintf("labels 未知子命令 %q（可用：list | create）", sub)}
	}
}

// runLabelsList：teai labels list --repo owner/repo
func runLabelsList(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai labels list", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "labels list 需要 --repo owner/repo"}
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	labels, err := ops.ListLabels(context.Background(), owner, name)
	if err != nil {
		return err
	}
	rows := make([]gitea.Values, 0, len(labels))
	for _, l := range labels {
		rows = append(rows, gitea.Values{l.Name, l.Color, l.Description})
	}
	return printer(env).PrintList([]gitea.Field{
		{Name: "name"}, {Name: "color"}, {Name: "description"},
	}, rows)
}

// runLabelsCreate：teai labels create --repo owner/repo --name … [--color …] [--description …] --yes
func runLabelsCreate(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai labels create", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	labelName := fs.String("name", "", "標籤名（必填）")
	color := fs.String("color", "#ffffff", "顏色（#RRGGBB，預設 #ffffff）")
	desc := fs.String("description", "", "說明")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "labels create 需要 --repo owner/repo"}
	}
	if *labelName == "" {
		return &ErrUsage{Msg: "labels create 需要 --name"}
	}
	if err := requireYes(*yes, "labels create"); err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	label, err := ops.CreateLabel(context.Background(), owner, name, *labelName, *color, *desc)
	if err != nil {
		return err
	}
	return printer(env).PrintOne([]gitea.Field{
		{Name: "name"}, {Name: "color"}, {Name: "description"},
	}, gitea.Values{label.Name, label.Color, label.Description})
}

// ---- milestones ----

// runMilestones：teai milestones [list|create] …；不帶子命令時輸出
// 跨倉庫里程碑總覽（#31，對應 gitea.py milestones）。帶 --repo 直接
// 跟在 milestones 之後時維持現行單倉庫 list 語義。
func runMilestones(env *Env, args []string) error {
	if len(args) == 0 {
		return runMilestonesOverview(env)
	}
	sub, rest := args[0], args[1:]
	switch sub {
	case "list":
		return runMilestonesList(env, rest)
	case "create":
		return runMilestonesCreate(env, rest)
	default:
		if !strings.HasPrefix(sub, "-") {
			return &ErrUsage{Msg: fmt.Sprintf("milestones 未知子命令 %q（可用：list | create；或不帶參數輸出跨倉庫總覽）", sub)}
		}
		// milestones 之後直接跟旗標（非子命令）：帶 --repo → 整串轉發，
		// 維持現行單倉庫 list 語義（--state 等旗標一併生效）；否則為
		// 跨倉庫總覽（總覽不接受任何命令旗標，空 FlagSet 讓未知旗標
		// 報用法錯誤）。
		hasRepo := false
		for _, a := range args {
			if a == "--repo" || strings.HasPrefix(a, "--repo=") {
				hasRepo = true
				break
			}
		}
		if hasRepo {
			return runMilestonesList(env, args)
		}
		fs := flag.NewFlagSet("teai milestones", flag.ContinueOnError)
		fs.SetOutput(env.Err)
		if err := parseFlags(fs, args); err != nil {
			return err
		}
		if fs.NArg() != 0 {
			return &ErrUsage{Msg: "milestones 不接受位置參數（子命令：list | create）"}
		}
		return runMilestonesOverview(env)
	}
}

// runMilestonesList：teai milestones list --repo owner/repo [--state open|closed|all]
func runMilestonesList(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai milestones list", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	state := fs.String("state", "open", "狀態：open|closed|all")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "milestones list 需要 --repo owner/repo"}
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	ms, err := ops.ListMilestones(context.Background(), owner, name, *state)
	if err != nil {
		return err
	}
	rows := make([]gitea.Values, 0, len(ms))
	for _, m := range ms {
		rows = append(rows, gitea.Values{m.Title, m.State, m.Description, m.DueOn})
	}
	return printer(env).PrintList([]gitea.Field{
		{Name: "title"}, {Name: "state"}, {Name: "description"}, {Name: "due_on"},
	}, rows)
}

// runMilestonesCreate：teai milestones create --repo owner/repo --title … [--description …] [--due …] --yes
func runMilestonesCreate(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai milestones create", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	title := fs.String("title", "", "標題（必填）")
	desc := fs.String("description", "", "說明")
	due := fs.String("due", "", "截止日（RFC3339，可選）")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "milestones create 需要 --repo owner/repo"}
	}
	if *title == "" {
		return &ErrUsage{Msg: "milestones create 需要 --title"}
	}
	if err := requireYes(*yes, "milestones create"); err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	m, err := ops.CreateMilestone(context.Background(), owner, name, *title, *desc, *due)
	if err != nil {
		return err
	}
	return printer(env).PrintOne([]gitea.Field{
		{Name: "id"}, {Name: "title"}, {Name: "state"}, {Name: "due_on"},
	}, gitea.Values{m.ID, m.Title, m.State, m.DueOn})
}

// ---- releases / repos / api ----

// runReleases：teai releases list --repo owner/repo
func runReleases(env *Env, args []string) error {
	if len(args) == 0 || args[0] != "list" {
		return &ErrUsage{Msg: "releases 目前支援子命令：list"}
	}
	fs := flag.NewFlagSet("teai releases list", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	repo := fs.String("repo", "", "倉庫（owner/repo，必填）")
	if err := parseFlags(fs, args[1:]); err != nil {
		return err
	}
	owner, name, err := splitRepoFlag(*repo)
	if err != nil {
		return err
	}
	if owner == "" {
		return &ErrUsage{Msg: "releases list 需要 --repo owner/repo"}
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	releases, err := ops.ListReleases(context.Background(), owner, name)
	if err != nil {
		return err
	}
	rows := make([]gitea.Values, 0, len(releases))
	for _, r := range releases {
		rows = append(rows, gitea.Values{r.TagName, r.Name, r.Draft, r.Prerelease, r.PublishedAt})
	}
	return printer(env).PrintList([]gitea.Field{
		{Name: "tag_name"}, {Name: "name"}, {Name: "draft"}, {Name: "prerelease"}, {Name: "published_at"},
	}, rows)
}

// runRepos：teai repos list [--org <org>]（未指定 --org 則列自己可存的倉庫）
func runRepos(env *Env, args []string) error {
	if len(args) == 0 || args[0] != "list" {
		return &ErrUsage{Msg: "repos 目前支援子命令：list"}
	}
	fs := flag.NewFlagSet("teai repos list", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	org := fs.String("org", "", "組織（未指定則列自己可存取的倉庫）")
	if err := parseFlags(fs, args[1:]); err != nil {
		return err
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	var repos []dailyops.Repo
	if *org != "" {
		repos, err = ops.ListOrgRepos(context.Background(), *org)
	} else {
		repos, err = ops.ListMyRepos(context.Background())
	}
	if err != nil {
		return err
	}
	rows := make([]gitea.Values, 0, len(repos))
	for _, r := range repos {
		rows = append(rows, gitea.Values{r.FullName, r.Private, r.Empty, r.UpdatedAt, r.HTMLURL})
	}
	return printer(env).PrintList([]gitea.Field{
		{Name: "full_name"}, {Name: "private"}, {Name: "empty"}, {Name: "updated_at"}, {Name: "url"},
	}, rows)
}

// runAPIDirect：teai api <path> [--method GET|POST|…] [--data <json>] [--yes]
func runAPIDirect(env *Env, args []string) error {
	fs := flag.NewFlagSet("teai api", flag.ContinueOnError)
	fs.SetOutput(env.Err)
	method := fs.String("method", "GET", "HTTP 動詞（GET 預設；非 GET 需 --yes）")
	data := fs.String("data", "", "請求 body（JSON 字串，可選）")
	yes := fs.Bool("yes", false, "確認寫入")
	if err := parseFlags(fs, args); err != nil {
		return err
	}
	if fs.NArg() != 1 {
		return &ErrUsage{Msg: "api 需要恰好一個 path（相對 api/v1，以 / 開頭）"}
	}
	path := fs.Arg(0)
	// path 內含查詢字串（如 /repos/x?state=closed）時剝離到 rawQuery，
	// 不可併進 URL path（會 404）。
	rawQuery := ""
	if q := strings.IndexByte(path, '?'); q >= 0 {
		rawQuery = path[q+1:]
		path = path[:q]
	}
	if path == "" || path[0] != '/' {
		return &ErrUsage{Msg: "api path 必須以 / 開頭（相對 api/v1）"}
	}
	upper := strings.ToUpper(strings.TrimSpace(*method))
	if upper == "" {
		upper = "GET"
	}
	switch upper {
	case "GET", "HEAD", "OPTIONS":
	default:
		if err := requireYes(*yes, "api "+upper); err != nil {
			return err
		}
	}
	var payload []byte
	if strings.TrimSpace(*data) != "" {
		if !json.Valid([]byte(*data)) {
			return &ErrUsage{Msg: "--data 必須是合法 JSON"}
		}
		payload = []byte(*data)
	}
	ops, err := newOpsClient(env)
	if err != nil {
		return err
	}
	resp, err := ops.CallAPIDirect(context.Background(), upper, path, rawQuery, payload)
	if err != nil {
		return err
	}
	// 原樣輸出（teai api 是逃生口，不做欄位挑選）。
	_, err = env.Out.Write(resp)
	if len(resp) > 0 && resp[len(resp)-1] != '\n' {
		fmt.Fprintln(env.Out)
	}
	return err
}