package cmd

import (
	"bytes"
	"flag"
	"maps"
	"slices"
	"strings"
	"testing"

	flagPkg "gitea.com/gitea/gitea-mcp/pkg/flag"
)

func TestInitFlagSetBind(t *testing.T) {
	for _, test := range []struct {
		name string
		args []string
		want string
	}{
		{name: "default is empty, meaning all interfaces", args: []string{}},
		{name: "-b sets the address", args: []string{"-b", "127.0.0.1"}, want: "127.0.0.1"},
		{name: "-bind sets an IPv6 literal", args: []string{"-bind", "::1"}, want: "::1"},
	} {
		t.Run(test.name, func(t *testing.T) {
			t.Cleanup(func() { flagPkg.Bind = "" })
			fs := flag.NewFlagSet("test", flag.ContinueOnError)
			initFlagSet(fs, test.args, func(string) string { return "" }, func(string) ([]byte, error) { return nil, nil }, &bytes.Buffer{})
			if flagPkg.Bind != test.want {
				t.Errorf("Bind = %q, want %q", flagPkg.Bind, test.want)
			}
		})
	}
}

func TestInitFlagSetScopes(t *testing.T) {
	tests := []struct {
		name string
		args []string
		env  map[string]string
		want []string
	}{
		{
			name: "no scope flag or env leaves AllowedScopes unset",
			args: []string{},
			want: nil,
		},
		{
			name: "-S sets a single scope",
			args: []string{"-S", "repository"},
			want: []string{"repository"},
		},
		{
			name: "-scope sets a comma-separated list",
			args: []string{"-scope", "repository,file"},
			want: []string{"file", "repository"},
		},
		{
			name: "GITEA_SCOPES env sets the default",
			args: []string{},
			env:  map[string]string{"GITEA_SCOPES": "issue,pull_request"},
			want: []string{"issue", "pull_request"},
		},
		{
			name: "-S flag takes precedence over GITEA_SCOPES env",
			args: []string{"-S", "file"},
			env:  map[string]string{"GITEA_SCOPES": "issue"},
			want: []string{"file"},
		},
		{
			name: "normalizes case, whitespace, and hyphens/spaces to underscores",
			args: []string{"-S", " Pull Request , pull-request , PULL_REQUEST "},
			want: []string{"pull_request"},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			origScopes := flagPkg.AllowedScopes
			t.Cleanup(func() {
				flagPkg.AllowedScopes = origScopes
			})
			flagPkg.AllowedScopes = nil

			getenv := func(key string) string { return tt.env[key] }
			readFile := func(string) ([]byte, error) { return nil, nil }
			fs := flag.NewFlagSet("test", flag.ContinueOnError)
			var stderr bytes.Buffer

			initFlagSet(fs, tt.args, getenv, readFile, &stderr)

			got := slices.Sorted(maps.Keys(flagPkg.AllowedScopes))
			want := slices.Clone(tt.want)
			slices.Sort(want)
			if !slices.Equal(got, want) {
				t.Errorf("AllowedScopes = %v, want %v", got, want)
			}
		})
	}
}

func TestInitFlagSetExtraHeaders(t *testing.T) {
	t.Cleanup(func() { flagPkg.ExtraHeaders = nil })

	getenv := func(key string) string {
		if key == "GITEA_EXTRA_HEADERS" {
			return `{"CF-Access-Client-Id":"id","CF-Access-Client-Secret":"secret"}`
		}
		return ""
	}
	readFile := func(string) ([]byte, error) { return nil, nil }
	fs := flag.NewFlagSet("test", flag.ContinueOnError)
	var stderr bytes.Buffer

	initFlagSet(fs, []string{}, getenv, readFile, &stderr)

	if got := flagPkg.ExtraHeaders.Get("CF-Access-Client-Id"); got != "id" {
		t.Errorf("ExtraHeaders[CF-Access-Client-Id] = %q, want %q", got, "id")
	}
	if got := flagPkg.ExtraHeaders.Get("CF-Access-Client-Secret"); got != "secret" {
		t.Errorf("ExtraHeaders[CF-Access-Client-Secret] = %q, want %q", got, "secret")
	}
}

func TestInitFlagSetExtraHeadersInvalidJSON(t *testing.T) {
	t.Cleanup(func() { flagPkg.ExtraHeaders = nil })

	origOsExit := osExit
	var exitCode int
	osExit = func(code int) { exitCode = code }
	t.Cleanup(func() { osExit = origOsExit })

	getenv := func(key string) string {
		if key == "GITEA_EXTRA_HEADERS" {
			return `not-json`
		}
		return ""
	}
	readFile := func(string) ([]byte, error) { return nil, nil }
	fs := flag.NewFlagSet("test", flag.ContinueOnError)
	var stderr bytes.Buffer

	initFlagSet(fs, []string{}, getenv, readFile, &stderr)

	if exitCode != 1 {
		t.Errorf("exitCode = %d, want 1", exitCode)
	}
	if !strings.Contains(stderr.String(), "GITEA_EXTRA_HEADERS") {
		t.Errorf("stderr = %q, want mention of GITEA_EXTRA_HEADERS", stderr.String())
	}
}