package config

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func TestDirPerm(t *testing.T) {
	t.Parallel()
	if DirPerm != 0o700 {
		t.Fatalf("DirPerm = %o, want 700", DirPerm)
	}
}

func TestFilePerm(t *testing.T) {
	t.Parallel()
	if FilePerm != 0o600 {
		t.Fatalf("FilePerm = %o, want 600", FilePerm)
	}
}

func TestHTTPTimeout(t *testing.T) {
	t.Parallel()
	if HTTPTimeout <= 0 {
		t.Fatalf("HTTPTimeout = %v, want positive", HTTPTimeout)
	}
	if HTTPTimeout != 30*time.Second {
		t.Fatalf("HTTPTimeout = %v, want 30s", HTTPTimeout)
	}
}

func TestOAuthTimeout(t *testing.T) {
	t.Parallel()
	if OAuthTimeout <= 0 {
		t.Fatalf("OAuthTimeout = %v, want positive", OAuthTimeout)
	}
	if OAuthTimeout != 15*time.Second {
		t.Fatalf("OAuthTimeout = %v, want 15s", OAuthTimeout)
	}
}

func TestDiscoveryTimeout(t *testing.T) {
	t.Parallel()
	if DiscoveryTimeout <= 0 {
		t.Fatalf("DiscoveryTimeout = %v, want positive", DiscoveryTimeout)
	}
	if DiscoveryTimeout != 10*time.Second {
		t.Fatalf("DiscoveryTimeout = %v, want 10s", DiscoveryTimeout)
	}
}

func TestLockTimeout(t *testing.T) {
	t.Parallel()
	if LockTimeout <= 0 {
		t.Fatalf("LockTimeout = %v, want positive", LockTimeout)
	}
	if LockTimeout != 10*time.Second {
		t.Fatalf("LockTimeout = %v, want 10s", LockTimeout)
	}
}

func TestMaxResponseBodySize(t *testing.T) {
	t.Parallel()
	want := 10 * 1024 * 1024
	if MaxResponseBodySize != want {
		t.Fatalf("MaxResponseBodySize = %d, want %d (10MB)", MaxResponseBodySize, want)
	}
}

func TestDefaultPartition(t *testing.T) {
	t.Parallel()
	if DefaultPartition != "default/default" {
		t.Fatalf("DefaultPartition = %q, want %q", DefaultPartition, "default/default")
	}
}

func TestEditionPartition(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name  string
		input string
		want  string
	}{
		{"empty maps to default", "", DefaultPartition},
		{"open maps to default", "open", DefaultPartition},
		{"whitespace is trimmed", "  wukong  ", "wukong/default"},
		{"wukong overlay", "wukong", "wukong/default"},
		{"arbitrary edition", "internal-lab", "internal-lab/default"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := EditionPartition(tc.input); got != tc.want {
				t.Fatalf("EditionPartition(%q) = %q, want %q", tc.input, got, tc.want)
			}
		})
	}
}

func TestIsOpenEdition(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name  string
		input string
		want  bool
	}{
		{"empty is open", "", true},
		{"open is open", "open", true},
		{"whitespace open is open", "  open  ", true},
		{"wukong is sibling", "wukong", false},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := IsOpenEdition(tc.input); got != tc.want {
				t.Fatalf("IsOpenEdition(%q) = %v, want %v", tc.input, got, tc.want)
			}
		})
	}
}

func TestEditionFileName(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name    string
		edition string
		want    string
	}{
		{"empty uses legacy filename", "", "app.json"},
		{"open uses legacy filename", "open", "app.json"},
		{"whitespace is trimmed", "  wukong  ", "app-wukong.json"},
		{"sibling is suffixed", "wukong", "app-wukong.json"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := EditionFileName(tc.edition, "app", ".json"); got != tc.want {
				t.Fatalf("EditionFileName(%q, \"app\", \".json\") = %q, want %q", tc.edition, got, tc.want)
			}
		})
	}
}

func TestManualTokenExpiry(t *testing.T) {
	t.Parallel()
	if ManualTokenExpiry <= 0 {
		t.Fatalf("ManualTokenExpiry = %v, want positive", ManualTokenExpiry)
	}
	if ManualTokenExpiry != 24*time.Hour {
		t.Fatalf("ManualTokenExpiry = %v, want 24h", ManualTokenExpiry)
	}
}

func TestDeviceFlowTimeout(t *testing.T) {
	t.Parallel()
	if DeviceFlowTimeout <= 0 {
		t.Fatalf("DeviceFlowTimeout = %v, want positive", DeviceFlowTimeout)
	}
	if DeviceFlowTimeout != 16*time.Minute {
		t.Fatalf("DeviceFlowTimeout = %v, want 16m", DeviceFlowTimeout)
	}
}

func TestOAuthFlowTimeout(t *testing.T) {
	t.Parallel()
	if OAuthFlowTimeout <= 0 {
		t.Fatalf("OAuthFlowTimeout = %v, want positive", OAuthFlowTimeout)
	}
	if OAuthFlowTimeout != 6*time.Minute {
		t.Fatalf("OAuthFlowTimeout = %v, want 6m", OAuthFlowTimeout)
	}
}

func TestDefaultAccessTokenExpiry(t *testing.T) {
	t.Parallel()
	if DefaultAccessTokenExpiry != 7200 {
		t.Fatalf("DefaultAccessTokenExpiry = %d, want 7200", DefaultAccessTokenExpiry)
	}
}

func TestDefaultRefreshTokenLifetime(t *testing.T) {
	t.Parallel()
	if DefaultRefreshTokenLifetime <= 0 {
		t.Fatalf("DefaultRefreshTokenLifetime = %v, want positive", DefaultRefreshTokenLifetime)
	}
	if DefaultRefreshTokenLifetime != 30*24*time.Hour {
		t.Fatalf("DefaultRefreshTokenLifetime = %v, want 720h", DefaultRefreshTokenLifetime)
	}
}

func TestDefaultFetchServersLimit(t *testing.T) {
	t.Parallel()
	if DefaultFetchServersLimit != 200 {
		t.Fatalf("DefaultFetchServersLimit = %d, want 200", DefaultFetchServersLimit)
	}
}

func TestGetMCPBaseURLDefaultsToProduction(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("DWS_CONFIG_DIR", dir)

	got := GetMCPBaseURL()
	if got != "https://mcp.dingtalk.com" {
		t.Fatalf("GetMCPBaseURL() = %q, want production MCP URL", got)
	}
	if strings.Contains(got, "pre-mcp") {
		t.Fatalf("GetMCPBaseURL() = %q, must not default to prepub MCP URL", got)
	}
}

func TestGetMCPBaseURLUsesConfigFile(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("DWS_CONFIG_DIR", dir)
	if err := os.WriteFile(filepath.Join(dir, "mcp_url"), []byte("https://custom-mcp.example.com\n"), FilePerm); err != nil {
		t.Fatalf("WriteFile(mcp_url) error = %v", err)
	}
	if got := GetMCPBaseURL(); got != "https://custom-mcp.example.com" {
		t.Fatalf("GetMCPBaseURL() = %q, want configured URL", got)
	}
}

func TestCrossPlatformCoverageGetDeveloperSettingsURLUsesInternationalMCPRegion(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("DWS_CONFIG_DIR", dir)
	if err := os.WriteFile(filepath.Join(dir, "mcp_url"), []byte("https://mcp.dingtalk.io\n"), FilePerm); err != nil {
		t.Fatalf("WriteFile(mcp_url) error = %v", err)
	}

	want := "https://open-dev.dingtalk.io/fe/old#/developerSettings"
	if got := GetDeveloperSettingsURL(); got != want {
		t.Fatalf("GetDeveloperSettingsURL() = %q, want %q", got, want)
	}
}

func TestCrossPlatformCoverageGetTerminalBaseURLPrefersExplicitConfig(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("DWS_CONFIG_DIR", dir)
	if err := os.WriteFile(filepath.Join(dir, "mcp_url"), []byte("https://mcp.dingtalk.io\n"), FilePerm); err != nil {
		t.Fatalf("WriteFile(mcp_url) error = %v", err)
	}
	if err := os.WriteFile(filepath.Join(dir, "terminal_url"), []byte("https://custom-open-dev.example.com\n"), FilePerm); err != nil {
		t.Fatalf("WriteFile(terminal_url) error = %v", err)
	}

	if got := GetTerminalBaseURL(); got != "https://custom-open-dev.example.com" {
		t.Fatalf("GetTerminalBaseURL() = %q, want explicit terminal URL", got)
	}
}

func TestMaxUploadFileSize(t *testing.T) {
	t.Parallel()
	var want int64 = 100 * 1024 * 1024
	if MaxUploadFileSize != want {
		t.Fatalf("MaxUploadFileSize = %d, want %d (100MB)", MaxUploadFileSize, want)
	}
}