package runtimeconfig

import (
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
)

func TestLoadChannelsFileWins(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	if err := os.WriteFile(path, []byte(`{"kook":[{"id":"a","config":{"bot_token":"tk"}}]}`), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	accounts, warn := LoadChannels(path, map[string][]config.ChannelAccount{
		"telegram": {{ID: "env", Config: map[string]any{"bot_token": "env"}}},
	})
	if warn != nil {
		t.Fatalf("warn = %v, want nil", warn)
	}
	if len(accounts["kook"]) != 1 || accounts["kook"][0].ID != "a" || accounts["kook"][0].Config["bot_token"] != "tk" {
		t.Fatalf("file accounts not used: %+v", accounts)
	}
	if _, ok := accounts["telegram"]; ok {
		t.Fatalf("file should win over env fallback, telegram leaked in: %+v", accounts)
	}
}

func TestLoadChannelsMissingFallsBackToEnv(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "nope.json")
	fallback := map[string][]config.ChannelAccount{"telegram": {{ID: "env", Config: map[string]any{"bot_token": "tk"}}}}
	accounts, warn := LoadChannels(path, fallback)
	if warn != nil {
		t.Fatalf("warn = %v, want nil for missing file", warn)
	}
	if len(accounts["telegram"]) != 1 || accounts["telegram"][0].ID != "env" {
		t.Fatalf("fallback not used: %+v", accounts)
	}
}

func TestLoadChannelsInvalidFallsBackWithWarn(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	if err := os.WriteFile(path, []byte(`{not-json`), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	fallback := map[string][]config.ChannelAccount{"kook": {{Config: map[string]any{}}}}
	accounts, warn := LoadChannels(path, fallback)
	if warn == nil {
		t.Fatal("warn = nil, want a warning for an invalid file")
	}
	if len(accounts["kook"]) != 1 {
		t.Fatalf("invalid file did not fall back to env: %+v", accounts)
	}
}

func TestLoadChannelsEmptyFileFallsBackWithWarn(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	if err := os.WriteFile(path, []byte("  \n"), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	fallback := map[string][]config.ChannelAccount{"kook": {{Config: map[string]any{}}}}
	accounts, warn := LoadChannels(path, fallback)
	if warn == nil {
		t.Fatal("warn = nil, want a warning for an empty file")
	}
	if len(accounts["kook"]) != 1 {
		t.Fatalf("empty file did not fall back to env: %+v", accounts)
	}
}

func TestLoadChannelsEmptyMapFallsBackWithWarn(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	if err := os.WriteFile(path, []byte(`{}`), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	fallback := map[string][]config.ChannelAccount{"kook": {{Config: map[string]any{}}}}
	accounts, warn := LoadChannels(path, fallback)
	if warn == nil {
		t.Fatal("warn = nil, want a warning for an empty map")
	}
	if len(accounts["kook"]) != 1 {
		t.Fatalf("empty map did not fall back to env: %+v", accounts)
	}
}

func TestLoadChannelsCleansEmptyTokenKook(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	// A stale channels.json holding a bare empty-token kook plus a real account.
	raw := `{"kook":[
		{"id":"","config":{"base_url":"","bot_token":""}},
		{"id":"3fc8ef9434bddfbbe4f4daa8da21c093","config":{"bot_token":"real-token"}}
	]}`
	if err := os.WriteFile(path, []byte(raw), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	accounts, warn := LoadChannels(path, nil)
	if warn != nil {
		t.Fatalf("warn = %v, want nil", warn)
	}
	kook := accounts["kook"]
	if len(kook) != 1 {
		t.Fatalf("kook = %+v, want only the token-bearing account", kook)
	}
	if kook[0].ID != "3fc8ef9434bddfbbe4f4daa8da21c093" || kook[0].Config["bot_token"] != "real-token" {
		t.Fatalf("kook = %+v, want the token-bearing account", kook[0])
	}
}

func TestLoadChannelsKeepsNonTokenPlatforms(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	// qq-obv11/webhook carry no bot token and must be preserved.
	raw := `{"qq-obv11":[{"id":"","config":{"mode":"server"}}],"webhook":[{"id":"","config":{"endpointPath":""}}]}`
	if err := os.WriteFile(path, []byte(raw), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	accounts, warn := LoadChannels(path, nil)
	if warn != nil {
		t.Fatalf("warn = %v", warn)
	}
	if len(accounts["qq-obv11"]) != 1 || len(accounts["webhook"]) != 1 {
		t.Fatalf("non-token platforms should be preserved: %+v", accounts)
	}
}

func TestSaveChannelsDropsEmptyTokenBareAccount(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	accts := map[string][]config.ChannelAccount{
		"kook": {
			{ID: "", Config: map[string]any{"bot_token": ""}},
			{ID: "a", Config: map[string]any{"bot_token": "tk"}},
		},
		"webhook": {{ID: "", Config: map[string]any{"endpointPath": ""}}},
	}
	if err := SaveChannels(path, accts); err != nil {
		t.Fatalf("save: %v", err)
	}
	got, warn := LoadChannels(path, nil)
	if warn != nil {
		t.Fatalf("load warn = %v", warn)
	}
	if len(got["kook"]) != 1 || got["kook"][0].ID != "a" {
		t.Fatalf("kook = %+v, want only the token-bearing account", got["kook"])
	}
	if _, ok := got["webhook"]; !ok || len(got["webhook"]) != 1 {
		t.Fatalf("webhook should be preserved untouched: %+v", got["webhook"])
	}
}

func TestSaveChannelsRoundTrip(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	accts := map[string][]config.ChannelAccount{
		"kook": {{ID: "a", Config: map[string]any{"bot_token": "tk"}}},
	}
	if err := SaveChannels(path, accts); err != nil {
		t.Fatalf("save: %v", err)
	}
	got, warn := LoadChannels(path, nil)
	if warn != nil {
		t.Fatalf("load warn = %v", warn)
	}
	if len(got["kook"]) != 1 || got["kook"][0].Config["bot_token"] != "tk" {
		t.Fatalf("round trip mismatch: %+v", got)
	}
	info, err := os.Stat(path)
	if err != nil {
		t.Fatalf("stat: %v", err)
	}
	if runtime.GOOS != "windows" {
		// Windows has no POSIX permission bits for regular files: Chmod only
		// toggles the read-only flag and Stat reports 0666 regardless of the
		// requested 0600, so this assertion is only meaningful on Unix-like
		// platforms. SaveChannels still requests 0600 (see channels.go).
		if info.Mode().Perm()&0o077 != 0 {
			t.Fatalf("channels.json mode = %v, want owner-only (0600)", info.Mode().Perm())
		}
	}
}

func TestUpsertChannelAssignsIDAndReplaces(t *testing.T) {
	t.Parallel()
	accounts := map[string][]config.ChannelAccount{
		"kook": {{ID: "a", Config: map[string]any{"bot_token": "old"}}},
	}
	// Blank ID → generated.
	added := UpsertChannel(accounts, "kook", config.ChannelAccount{Config: map[string]any{"bot_token": "new"}})
	if len(added["kook"]) != 2 {
		t.Fatalf("want 2 accounts after add, got %d", len(added["kook"]))
	}
	if added["kook"][1].ID == "" {
		t.Fatal("new account should get a generated id")
	}
	// Same ID → replaced in place.
	replaced := UpsertChannel(accounts, "kook", config.ChannelAccount{ID: "a", Config: map[string]any{"bot_token": "updated"}})
	if len(replaced["kook"]) != 2 {
		t.Fatalf("want 2 accounts after replace, got %d", len(replaced["kook"]))
	}
	if replaced["kook"][0].Config["bot_token"] != "updated" {
		t.Fatalf("replace did not update in place: %+v", replaced["kook"][0])
	}
}

// TestPatchChannelKeepsOmittedKeys 钉住补丁语义：补丁里缺位的键保留
// 已存值，给出的键覆盖，显式 nil/"" 删除该键（且已存 map 不被就地改写）。
func TestPatchChannelKeepsOmittedKeys(t *testing.T) {
	t.Parallel()
	stored := map[string]any{"bot_token": "old-token", "webhook_url": "https://old", "cdn_base_url": ""}
	accounts := map[string][]config.ChannelAccount{
		"telegram": {{ID: "conf0", Config: stored}},
	}
	out := PatchChannel(accounts, "telegram", config.ChannelAccount{
		ID:     "conf0",
		Config: map[string]any{"webhook_url": "https://new"},
	})
	got := out["telegram"][0].Config
	if got["bot_token"] != "old-token" {
		t.Fatalf("an omitted key was lost: %v", got)
	}
	if got["webhook_url"] != "https://new" {
		t.Fatalf("a given key was not overridden: %v", got)
	}
	// 已存条目自身不被改动（补丁是纯函数式的合并）。
	if stored["webhook_url"] != "https://old" {
		t.Fatalf("PatchChannel mutated the stored map: %v", stored)
	}
}

// TestPatchChannelClearsOnNilAndBlank 覆盖「清除」三态的一半：显式 nil 与
// 只含空白的字符串删除该键；数字 0 / 布尔 false 是真实取值，不算空。
func TestPatchChannelClearsOnNilAndBlank(t *testing.T) {
	t.Parallel()
	accounts := map[string][]config.ChannelAccount{
		"qq-obv11": {{ID: "ob1", Config: map[string]any{
			"mode": "server", "remote_url": "ws://x", "listen_addr": "127.0.0.1:1", "verbose": true,
		}}},
	}
	out := PatchChannel(accounts, "qq-obv11", config.ChannelAccount{
		ID: "ob1",
		Config: map[string]any{
			"mode": nil, "remote_url": "", "listen_addr": "   ",
			"verbose": false, "retry": float64(0),
		},
	})
	got := out["qq-obv11"][0].Config
	for _, key := range []string{"mode", "remote_url", "listen_addr"} {
		if _, present := got[key]; present {
			t.Fatalf("key %q should have been cleared: %v", key, got)
		}
	}
	if v, ok := got["verbose"]; !ok || v != false {
		t.Fatalf("verbose = %#v (present=%v), want a real false kept", v, ok)
	}
	if v, ok := got["retry"]; !ok || v != float64(0) {
		t.Fatalf("retry = %#v (present=%v), want a real 0 kept", v, ok)
	}
}

// TestPatchChannelWithoutBaseline 覆盖没有已存条目的情形：补丁即配置，
// 空 id 由 UpsertChannel 生成，且清除不会留下 null 值。
func TestPatchChannelWithoutBaseline(t *testing.T) {
	t.Parallel()
	accounts := map[string][]config.ChannelAccount{}
	out := PatchChannel(accounts, "weixin-ilink", config.ChannelAccount{
		Config: map[string]any{"cdn_base_url": "https://cdn", "bot_token": nil},
	})
	list := out["weixin-ilink"]
	if len(list) != 1 || list[0].ID == "" {
		t.Fatalf("out = %+v, want one account with a generated id", list)
	}
	if list[0].Config["cdn_base_url"] != "https://cdn" {
		t.Fatalf("config = %v, want the patch written", list[0].Config)
	}
	if _, present := list[0].Config["bot_token"]; present {
		t.Fatalf("a clear must not write a key: %v", list[0].Config)
	}
}

// TestPatchChannelOnlyTouchesTargetAccount 钉住「补丁只作用于目标账号」：
// 兄弟账号与其它平台的 config 完全不动。
func TestPatchChannelOnlyTouchesTargetAccount(t *testing.T) {
	t.Parallel()
	accounts := map[string][]config.ChannelAccount{
		"telegram": {
			{ID: "conf0", Config: map[string]any{"bot_token": "a"}},
			{ID: "conf1", Config: map[string]any{"bot_token": "b", "webhook_url": "https://keep"}},
		},
		"kook": {{ID: "conf0", Config: map[string]any{"bot_token": "k"}}},
	}
	out := PatchChannel(accounts, "kook", config.ChannelAccount{ID: "conf0", Config: map[string]any{"bot_token": "k2"}})
	if len(out["telegram"]) != 2 || out["telegram"][1].Config["webhook_url"] != "https://keep" {
		t.Fatalf("a sibling account was touched: %+v", out["telegram"])
	}
	if out["kook"][0].Config["bot_token"] != "k2" || len(out["kook"][0].Config) != 1 {
		t.Fatalf("kook account = %+v, want just the patched key", out["kook"][0].Config)
	}
}

func TestDeleteChannelRemovesAccountAndDropsPlatform(t *testing.T) {
	t.Parallel()
	accounts := map[string][]config.ChannelAccount{
		"kook":     {{ID: "a", Config: map[string]any{}}, {ID: "b", Config: map[string]any{}}},
		"telegram": {{ID: "t", Config: map[string]any{}}},
	}
	out := DeleteChannel(accounts, "kook", "a")
	if len(out["kook"]) != 1 || out["kook"][0].ID != "b" {
		t.Fatalf("kook after delete: %+v", out["kook"])
	}
	// Deleting the last account drops the platform key entirely.
	out2 := DeleteChannel(out, "kook", "b")
	if _, ok := out2["kook"]; ok {
		t.Fatalf("kook should be dropped when empty: %+v", out2)
	}
	// Other platforms untouched.
	if len(out2["telegram"]) != 1 {
		t.Fatalf("telegram affected: %+v", out2)
	}
}

func TestMaskedRedactsTokensKeepsOriginal(t *testing.T) {
	t.Parallel()
	acct := config.ChannelAccount{
		ID:        "a",
		Config:    map[string]any{"bot_token": "super-secret-token", "base_url": "https://x", "access_token": "abc", "secret": "s"},
		DenyUsers: []string{"u1"},
	}
	masked := Masked(acct)
	if got := masked.Config["bot_token"]; got != "****oken" {
		t.Fatalf("bot_token = %v, want masked", got)
	}
	if got := masked.Config["access_token"]; got != "****" {
		t.Fatalf("access_token = %v, want fully masked", got)
	}
	if got := masked.Config["secret"]; got != "****" {
		t.Fatalf("secret = %v, want fully masked", got)
	}
	if got := masked.Config["base_url"]; got != "https://x" {
		t.Fatalf("base_url = %v, want unchanged", got)
	}
	if masked.DenyUsers[0] != "u1" {
		t.Fatalf("deny user list lost: %+v", masked)
	}
	// The original account still carries the raw token.
	if acct.Config["bot_token"] != "super-secret-token" {
		t.Fatalf("Masked mutated the original account")
	}
	if strings.Contains(masked.Config["bot_token"].(string), "super-secret") {
		t.Fatalf("masked leaked the full token: %v", masked.Config["bot_token"])
	}
}