// Copyright 2026 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package app

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

	"gitea.dev/tea/internal/clierr"
	"gitea.dev/tea/internal/version"
	"github.com/spf13/cobra"
	"github.com/stretchr/testify/require"
)

func TestHelpWorksWithoutValidConfiguration(t *testing.T) {
	for _, args := range [][]string{{}, {"help"}, {"version"}, {"man"}, {"man", "pr", "checkout"}, {"completion", "bash"}, {"--help"}} {
		deps, out, _ := testDeps(t)
		require.NoError(t, os.WriteFile(filepath.Join(deps.Settings.Dir, "config.yml"), []byte("not: ["), 0o600))
		require.NoError(t, Execute(context.Background(), deps, args))
		require.NotEmpty(t, out.String())
	}
}

func TestAliasesAndConfigPersistence(t *testing.T) {
	deps, out, _ := testDeps(t)
	require.NoError(t, Execute(context.Background(), deps, []string{"alias", "set", "prefs", "config list"}))
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"prefs"}))
	require.Contains(t, out.String(), "git_protocol")
	require.NoError(t, Execute(context.Background(), deps, []string{"alias", "set", "preferences", "prefs"}))
	require.NoError(t, Execute(context.Background(), deps, []string{"config", "set", "prompt", "disabled"}))
	require.NoError(t, Execute(context.Background(), deps, []string{"alias", "delete", "preferences"}))
	err := Execute(context.Background(), deps, []string{"alias", "set", "config", "issue list"})
	require.Error(t, err)
	require.Equal(t, clierr.Usage, clierr.ExitCode(err))
	s, err := deps.Settings.Load()
	require.NoError(t, err)
	require.Equal(t, "disabled", s.Preferences.Prompt)
}

func TestBrokenAliasDoesNotBlockOtherCommands(t *testing.T) {
	deps, out, _ := testDeps(t)
	require.NoError(t, os.WriteFile(filepath.Join(deps.Settings.Dir, "config.yml"), []byte("version: 1\naliases:\n  status: config list\n  dangling: missing\n"), 0o600))
	require.NoError(t, Execute(context.Background(), deps, []string{"config", "list"}))
	require.Contains(t, out.String(), "git_protocol")
	err := Execute(context.Background(), deps, []string{"dangling"})
	require.Equal(t, clierr.Usage, clierr.ExitCode(err))
	require.NoError(t, Execute(context.Background(), deps, []string{"alias", "delete", "status"}))
	require.NoError(t, Execute(context.Background(), deps, []string{"alias", "delete", "dangling"}))
}

func TestCommandLineEdgeCases(t *testing.T) {
	deps, out, _ := testDeps(t)
	err := Execute(context.Background(), deps, []string{"issue", "bogus"})
	require.Equal(t, clierr.Usage, clierr.ExitCode(err))
	err = Execute(context.Background(), deps, []string{"isue"})
	require.Equal(t, clierr.Usage, clierr.ExitCode(err))
	require.ErrorContains(t, err, "did you mean issue?")
	// A help flag supplied as a flag value must not bypass validation.
	err = Execute(context.Background(), deps, []string{"config", "list", "--jq", ".[", "--remote", "-h"})
	require.ErrorContains(t, err, "invalid --jq expression")
	require.NoError(t, Execute(context.Background(), deps, []string{"--version"}))
	require.Equal(t, version.Format()+"\n", out.String())
}

func TestAliasesAfterGlobalFlagsAndNestedHelp(t *testing.T) {
	deps, out, _ := testDeps(t)
	require.NoError(t, Execute(context.Background(), deps, []string{"alias", "set", "prefs", "config list"}))
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"--no-input", "prefs"}))
	require.Contains(t, out.String(), "git_protocol")
	require.NoError(t, os.WriteFile(filepath.Join(deps.Settings.Dir, "config.yml"), []byte("broken: ["), 0o600))
	for _, args := range [][]string{{"issue", "--help"}, {"repo"}, {"auth", "login", "--help"}} {
		require.NoError(t, Execute(context.Background(), deps, args))
	}
}

func TestJoinJSONFields(t *testing.T) {
	for _, tc := range []struct{ args, want []string }{
		{[]string{"issue", "list", "--json", "number,title"}, []string{"issue", "list", "--json=number,title"}},
		{[]string{"--json", "id", "org", "list"}, []string{"--json=id", "org", "list"}},
		{[]string{"issue", "list", "--json"}, []string{"issue", "list", "--json"}},
		{[]string{"search", "repo", "foo", "--json"}, []string{"search", "repo", "foo", "--json"}},
		{[]string{"issue", "view", "--json", "5"}, []string{"issue", "view", "--json", "5"}},
		{[]string{"repo", "clone", "--json", "alice/project"}, []string{"repo", "clone", "--json", "alice/project"}},
		{[]string{"issue", "list", "--json", "--state", "open"}, []string{"issue", "list", "--json", "--state", "open"}},
		{[]string{"search", "issues", "--", "--json", "id"}, []string{"search", "issues", "--", "--json", "id"}},
		{[]string{"search", "repo", "--json", "tea"}, []string{"search", "repo", "--json", "tea"}},
		{[]string{"search", "issue", "--json", "bug"}, []string{"search", "issue", "--json", "bug"}},
		{[]string{"repo", "clone", "--json", "project"}, []string{"repo", "clone", "--json", "project"}},
		{[]string{"search", "repo", "--json", "name,url", "tea"}, []string{"search", "repo", "--json=name,url", "tea"}},
		{[]string{"--json", "number", "my-alias"}, []string{"--json=number", "my-alias"}},
		// A word that cannot be an argument is a misspelled field, which then lists the available ones.
		{[]string{"issue", "list", "--json", "Number"}, []string{"issue", "list", "--json=Number"}},
		{[]string{"issue", "list", "--json", "number,titel"}, []string{"issue", "list", "--json=number,titel"}},
		{[]string{"run", "list", "--json", "workflow", "--limit", "5"}, []string{"run", "list", "--json=workflow", "--limit", "5"}},
		{[]string{"issue", "view", "--json", "titel"}, []string{"issue", "view", "--json", "titel"}},
		{[]string{"issue", "view", "5", "--json", "titel"}, []string{"issue", "view", "5", "--json=titel"}},
	} {
		deps, _, _ := testDeps(t)
		require.Equal(t, tc.want, joinJSONFields(NewRoot(deps), tc.args), tc.args)
	}
}

func TestJSONFieldsAcceptSpaceSeparatedValue(t *testing.T) {
	server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/api/v1/user/orgs":
			_, _ = w.Write([]byte(`[{"id":1,"username":"team","full_name":"Team"}]`))
		case "/api/v1/repos/search":
			require.Equal(t, "foo", r.URL.Query().Get("q"))
			_, _ = w.Write([]byte(`{"data":[{"id":2,"full_name":"alice/foo"}]}`))
		default:
			t.Errorf("unexpected request %s", r.URL.Path)
		}
	}))
	defer server.Close()
	deps, out, _ := serverDeps(t, server.URL)
	for _, args := range [][]string{{"org", "list", "--json", "id,name"}, {"org", "list", "--json=id,name"}, {"--json", "id,name", "org", "list"}} {
		out.Reset()
		require.NoError(t, Execute(context.Background(), deps, args), args)
		require.JSONEq(t, `[{"id":1,"name":"team"}]`, out.String(), args)
	}
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"org", "list", "--json"}))
	require.Contains(t, out.String(), `"full_name":"Team"`)
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"search", "repo", "foo", "--json"}))
	require.Contains(t, out.String(), `"full_name":"alice/foo"`)
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"search", "repo", "--json", "foo"}))
	require.Contains(t, out.String(), `"full_name":"alice/foo"`)
}

func TestSudoSendsHeaderAfterIdentityCheck(t *testing.T) {
	seen := []string{}
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		seen = append(seen, r.URL.Path+" "+r.Header.Get("Sudo"))
		if r.URL.Path == "/api/v1/user" {
			_, _ = w.Write([]byte(`{"login":"alice"}`))
			return
		}
		_, _ = w.Write([]byte(`{"id":7,"full_name":"alice/project"}`))
	}))
	defer server.Close()
	deps, out, _ := serverDeps(t, server.URL)
	require.NoError(t, Execute(context.Background(), deps, []string{"--sudo", "bob", "repo", "view", "--repo", "alice/project", "--json=full_name"}))
	require.Equal(t, []string{"/api/v1/user ", "/api/v1/repos/alice/project bob"}, seen)
	require.JSONEq(t, `{"full_name":"alice/project"}`, out.String())
	requireUsageBeforeRequests(t, "--sudo cannot be used with auth commands", "auth", "status", "--sudo", "bob")
	requireUsageBeforeRequests(t, "--sudo requires a username", "repo", "view", "--sudo", "")
}

func TestJSONFieldErrorsListAvailableFields(t *testing.T) {
	requireUsageBeforeRequests(t, "unknown JSON field \"titel\"\navailable fields: assignees, author, body", "issue", "list", "--json", "number,titel")
	requireUsageBeforeRequests(t, "unknown JSON field \"workflw\"\navailable fields: actor, attempt, branch", "run", "list", "--json", "workflw")
	requireUsageBeforeRequests(t, "--json= needs field names; use --json alone for every field", "pr", "list", "--json=")
	requireUsageBeforeRequests(t, "version prints text; --jq is not supported", "version", "--jq", ".")
}

func TestJQImpliesJSONAndShorthands(t *testing.T) {
	server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		_, _ = w.Write([]byte(`[{"id":1,"username":"team","full_name":"Team"}]`))
	}))
	defer server.Close()
	for _, args := range [][]string{{"org", "list", "--jq", ".[].name"}, {"org", "list", "-q", ".[].name"}, {"-q", ".[0].full_name", "org", "list"}} {
		deps, out, _ := serverDeps(t, server.URL)
		require.NoError(t, Execute(context.Background(), deps, args), args)
		require.Contains(t, []string{"team\n", "Team\n"}, out.String(), args)
	}
	deps, _, _ := testDeps(t)
	flags := NewRoot(deps).PersistentFlags()
	require.Equal(t, "yes", flags.ShorthandLookup("y").Name)
	require.Equal(t, "jq", flags.ShorthandLookup("q").Name)
}

func TestRawJSONCommandsKeepJQToThemselves(t *testing.T) {
	deps, out, _ := testDeps(t)
	root := NewRoot(deps)
	root.AddCommand(&cobra.Command{Use: "raw", Annotations: map[string]string{"tea.text": "raw prints text", "tea.rawjson": "true"}, RunE: func(cmd *cobra.Command, _ []string) error {
		_, err := fmt.Fprintf(cmd.OutOrStdout(), "json=%q", cmd.Flag("json").Value)
		return err
	}})
	root.SetArgs([]string{"raw", "--jq", ".x"})
	require.NoError(t, root.Execute())
	require.Equal(t, `json=""`, out.String())
	root.SetArgs([]string{"raw", "--json"})
	require.ErrorContains(t, root.Execute(), "raw prints text; --json is not supported")
}

func TestUnknownFlagsSuggestSimilarFlags(t *testing.T) {
	requireUsageBeforeRequests(t, "unknown flag: --lable; did you mean --label?", "issue", "list", "--lable", "bug")
	requireUsageBeforeRequests(t, "unknown flag: --stat; did you mean --state?", "issue", "list", "--stat", "open")
	requireUsageBeforeRequests(t, "unknown flag: --add-lable; did you mean --add-label?", "issue", "edit", "1", "--add-lable", "bug")
	deps, _, _ := testDeps(t)
	err := Execute(context.Background(), deps, []string{"issue", "list", "--zzzzzz"})
	require.Equal(t, clierr.Usage, clierr.ExitCode(err))
	require.EqualError(t, err, "unknown flag: --zzzzzz")
	for _, tc := range []struct {
		a, b     string
		distance int
	}{{"kitten", "sitting", 3}, {"", "abc", 3}, {"label", "label", 0}, {"lable", "label", 2}} {
		require.Equal(t, tc.distance, editDistance(tc.a, tc.b), tc)
	}
}

func TestRootHelpGroupsCommandsAndTopics(t *testing.T) {
	deps, out, _ := testDeps(t)
	require.NoError(t, Execute(context.Background(), deps, []string{"alias", "set", "co", "pr checkout"}))
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"--help"}))
	help := out.String()
	for _, want := range []string{
		"Work seamlessly with Gitea from the command line.\n\nUSAGE\n  tea <command> <subcommand> [flags]\n",
		"\nCORE COMMANDS\n  auth:          ",
		"\n  repo:          ",
		"\nACTIONS COMMANDS\n  run:           ",
		"\nADDITIONAL COMMANDS\n  admin:         ",
		"\n  completion:    Generate shell completion scripts\n",
		"\nALIAS COMMANDS\n  co:            Alias for \"pr checkout\"\n",
		"\nHELP TOPICS\n  environment:   ",
		"\nFLAGS\n  --help      Show help for command\n  --version   Show tea version\n",
		"\nEXAMPLES\n  $ tea issue create\n",
		"\nLEARN MORE\n  Use `tea <command> <subcommand> --help` for more information about a command.\n",
	} {
		require.Contains(t, help, want)
	}
	require.NotContains(t, help, "  help:")
	require.NotContains(t, help, "  man:")
	// Every visible top-level command belongs to one root help group.
	for _, cmd := range NewRoot(deps).Commands() {
		if cmd.IsAvailableCommand() {
			require.Contains(t, []string{"core", "actions", "additional"}, cmd.GroupID, cmd.Name())
		}
	}
}

func TestCommandHelpShowsRelevantFlagsOnly(t *testing.T) {
	deps, out, _ := testDeps(t)
	require.NoError(t, Execute(context.Background(), deps, []string{"issue", "list", "--help"}))
	help := out.String()
	for _, want := range []string{
		"\nUSAGE\n  tea issue list [flags]\n",
		"\nALIASES\n  tea issue ls\n",
		"\nFLAGS\n  -a, --assignee string ",
		"\nINHERITED FLAGS\n  -R, --repo OWNER/REPO ",
		"\n      --json fields ",
		"\n  -q, --jq expression ",
		"\n  -h, --help              Show help for command\n\n  " + globalFlagsLine + "\n",
		"\nJSON FIELDS\n  assignees, author, body, ",
	} {
		require.Contains(t, help, want)
	}
	for _, unwanted := range []string{"--sudo string", "--yes", `[="*"]`, "Global Flags:"} {
		require.NotContains(t, help, unwanted)
	}
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"label", "list", "--help"}))
	require.Contains(t, out.String(), "\nFLAGS\n  -L, --limit int          Maximum number of results (1..1000) (default 30)\n      --org organization ")
	for _, args := range [][]string{{"version", "--help"}, {"alias", "list", "--help"}, {"auth", "status", "--help"}} {
		out.Reset()
		require.NoError(t, Execute(context.Background(), deps, args))
		require.NotContains(t, out.String(), "--repo", args)
		require.Contains(t, out.String(), globalFlagsLine, args)
	}
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"version", "--help"}))
	require.NotContains(t, out.String(), "--json fields")
	out.Reset()
	require.NoError(t, Execute(context.Background(), deps, []string{"issue", "--help"}))
	require.Contains(t, out.String(), "\nUSAGE\n  tea issue <command> [flags]\n\nAVAILABLE COMMANDS\n  attachment:  ")
	require.NotContains(t, out.String(), "JSON FIELDS")
}

func TestHelpConfirmAndArgumentsAnnotations(t *testing.T) {
	deps, out, _ := testDeps(t)
	root := NewRoot(deps)
	issue, _, err := root.Find([]string{"issue"})
	require.NoError(t, err)
	issue.AddCommand(&cobra.Command{Use: "drop <number>", Short: "Drop an issue", Example: "# Drop issue 7\n$ tea issue drop 7", Annotations: map[string]string{"tea.confirm": "true", "tea.arguments": "An issue is a number or a URL."}, RunE: func(*cobra.Command, []string) error { return nil }})
	root.SetArgs([]string{"issue", "drop", "--help"})
	require.NoError(t, root.Execute())
	require.Contains(t, out.String(), "\n  -y, --yes ")
	require.Contains(t, out.String(), "\nARGUMENTS\n  An issue is a number or a URL.\n\nJSON FIELDS\n")
	require.Contains(t, out.String(), "\nEXAMPLES\n  # Drop issue 7\n  $ tea issue drop 7\n")
}

func TestHelpTopicsAndUnknownTopics(t *testing.T) {
	deps, out, _ := testDeps(t)
	for args, want := range map[string]string{
		"help environment": "  TEA_CONFIG_DIR ",
		"help exit-codes":  "  4    authentication",
		"help formatting":  "--jq runs inside tea",
		"help issue list":  "\nUSAGE\n  tea issue list [flags]\n",
		"environment":      "  -R, --repo OWNER/REPO ",
	} {
		out.Reset()
		require.NoError(t, Execute(context.Background(), deps, strings.Fields(args)), args)
		require.Contains(t, out.String(), want, args)
	}
	for args, want := range map[string]string{
		"help nope":       `unknown help topic "nope"; run tea help to list commands and topics`,
		"help isue":       `unknown help topic "isue"; did you mean issue?`,
		"help isue list":  `unknown help topic "isue list"; did you mean issue?`,
		"help env":        `unknown help topic "env"; did you mean environment?`,
		"help issue nope": `unknown help topic "issue nope"; run tea help to list commands and topics`,
	} {
		out.Reset()
		err := Execute(context.Background(), deps, strings.Fields(args))
		require.Equal(t, clierr.Usage, clierr.ExitCode(err), args)
		require.EqualError(t, err, want, args)
		require.Empty(t, out.String(), args)
	}
	values, _ := complete(t, deps, out, "help", "e")
	require.Equal(t, []string{"environment\tEnvironment variables and global flags", "exit-codes\tExit codes used by tea"}, values)
	values, _ = complete(t, deps, out, "help", "issue", "l")
	require.Equal(t, []string{"list\tList issues in a repository"}, values)
}

func TestVerbAndFlagAliases(t *testing.T) {
	deps, _, _ := testDeps(t)
	root := NewRoot(deps)
	for _, args := range [][]string{{"issue", "ls"}, {"label", "rm"}, {"pr", "review", "ls"}} {
		cmd, _, err := root.Find(args)
		require.NoError(t, err)
		require.Equal(t, map[string]string{"ls": "list", "rm": "delete"}[args[len(args)-1]], cmd.Name(), args)
	}
	// Aliases never shadow a sibling command.
	walkCommands(root, func(cmd *cobra.Command) {
		names := map[string]string{}
		for _, child := range cmd.Commands() {
			for _, name := range append([]string{child.Name()}, child.Aliases...) {
				require.Empty(t, names[name], "%s %s is both %s and %s", cmd.CommandPath(), name, names[name], child.Name())
				names[name] = child.Name()
			}
		}
	})
	var labels []string
	edit := &cobra.Command{Use: "edit", RunE: func(*cobra.Command, []string) error { return nil }}
	edit.Flags().StringSliceVar(&labels, "add-label", nil, "Add labels")
	flagAliases(edit, map[string]string{"add-labels": "add-label"})
	edit.SetArgs([]string{"--add-labels", "bug", "--add-label", "docs"})
	require.NoError(t, edit.Execute())
	require.Equal(t, []string{"bug", "docs"}, labels)
	require.NotContains(t, edit.UsageString(), "add-labels")
}

// TestHelpTextsAreComplete checks the help texts of every command: a Short line without a final period,
// a capitalized hyphenated verb ("Mark-read …") or a sibling's wording, an Example on every command and a
// Long text on every command group. Area streams remove the commands they complete from the allowlists
// below; S8 deletes the allowlists.
func TestHelpTextsAreComplete(t *testing.T) {
	deps, _, _ := testDeps(t)
	pending := func(list string) map[string]bool {
		set := map[string]bool{}
		for path := range strings.Lines(list) {
			if path = strings.TrimSpace(path); path != "" {
				set[path] = true
			}
		}
		return set
	}
	shorts, examples, longs := pending(shortsToFix), pending(examplesToWrite), pending(longsToWrite)
	walkCommands(NewRoot(deps), func(cmd *cobra.Command) {
		if !cmd.HasParent() || !cmd.IsAvailableCommand() {
			return
		}
		path := strings.TrimPrefix(cmd.CommandPath(), "tea ")
		generated := strings.Contains(cmd.Name(), "-") && strings.HasPrefix(cmd.Short, titleCase(cmd.Name())+" ")
		siblings := slices.ContainsFunc(cmd.Parent().Commands(), func(other *cobra.Command) bool { return other != cmd && other.Short == cmd.Short })
		badShort := cmd.Short == "" || strings.HasSuffix(cmd.Short, ".") || unicode.IsLower(rune(cmd.Short[0])) || generated || siblings
		checks := []struct {
			name    string
			missing bool
			pending map[string]bool
		}{
			{"a clear Short", badShort, shorts},
			{"an Example", cmd.Example == "" && cmd.Annotations["tea.group"] == "", examples},
			{"a Long text", cmd.Long == "" && cmd.Annotations["tea.group"] != "", longs},
		}
		for _, check := range checks {
			switch {
			case check.missing && !check.pending[path]:
				t.Errorf("%s needs %s", path, check.name)
			case !check.missing && check.pending[path]:
				t.Errorf("%s has %s now; remove it from the allowlist", path, check.name)
			}
			delete(check.pending, path)
		}
	})
	for _, check := range []map[string]bool{shorts, examples, longs} {
		for path := range check {
			t.Errorf("%s is allowlisted but is not a command", path)
		}
	}
}

// walkCommands calls visit for cmd and each of its descendants.
func walkCommands(cmd *cobra.Command, visit func(*cobra.Command)) {
	visit(cmd)
	for _, child := range cmd.Commands() {
		walkCommands(child, visit)
	}
}

// shortsToFix, examplesToWrite and longsToWrite list the commands whose help texts area streams
// have yet to complete; see TestHelpTextsAreComplete.
const (
	shortsToFix = `
`
	examplesToWrite = `
	issue attachment delete
	issue attachment download
	issue attachment edit
	issue attachment list
	issue attachment upload
	issue attachment view
	pr attachment delete
	pr attachment download
	pr attachment edit
	pr attachment list
	pr attachment upload
	pr attachment view
	search issue
	search pr
	time create
	time delete
	time list
	time reset
`
	longsToWrite = `
	issue attachment
	pr attachment
	time
`
)