package config

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

func TestRegistryBasic(t *testing.T) {
	r := NewConfigRegistry("")
	r.Register("core.llm.model", "deepseek-v4-flash")
	r.Register("plugin.qq.access_token", "abc123")

	val, err := r.Get("core.llm.model")
	if err != nil {
		t.Fatalf("Get error: %v", err)
	}
	if v, ok := val.(string); !ok || v != "deepseek-v4-flash" {
		t.Fatalf("expected deepseek-v4-flash, got %v", val)
	}

	keys := r.List("core")
	if len(keys) != 1 || keys[0] != "core.llm.model" {
		t.Fatalf("expected [core.llm.model], got %v", keys)
	}

	r.Set("core.llm.model", "gpt-4")
	val, _ = r.Get("core.llm.model")
	if v, _ := val.(string); v != "gpt-4" {
		t.Fatalf("expected gpt-4, got %v", val)
	}
}

func TestRegistryPersist(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.db")

	r := NewConfigRegistry(path)
	r.Register("core.log_level", "debug")
	r.Set("plugin.test.key", "42")
	if err := r.Flush(); err != nil {
		t.Fatalf("Flush: %v", err)
	}
	r.Close()

	r2 := NewConfigRegistry(path)
	val, err := r2.Get("plugin.test.key")
	if err != nil {
		t.Fatalf("Get after reload: %v", err)
	}
	if v, _ := val.(string); v != "42" {
		t.Fatalf("expected 42, got %v", val)
	}
	r2.Close()
}

func TestRegistryDelete(t *testing.T) {
	r := NewConfigRegistry("")
	r.Register("a.b", "1")
	r.Register("a.c", "2")
	r.Delete("a.b")
	keys := r.List("a")
	if len(keys) != 1 || keys[0] != "a.c" {
		t.Fatalf("expected [a.c], got %v", keys)
	}
}

func TestRegistryDump(t *testing.T) {
	r := NewConfigRegistry("")
	r.Register("x", "1")
	r.Register("y", "two")
	dump := r.Dump()
	if len(dump) != 2 {
		t.Fatalf("expected 2 keys, got %d", len(dump))
	}
}

func TestRegistryUnknownKey(t *testing.T) {
	r := NewConfigRegistry("")
	_, err := r.Get("nonexistent")
	if err == nil {
		t.Fatal("expected error for unknown key")
	}
}

func TestRegistryFlush(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.db")
	r := NewConfigRegistry(path)
	r.Set("k", "v")
	if err := r.Flush(); err != nil {
		t.Fatalf("Flush: %v", err)
	}
	r.Close()

	// Reopen and verify persistence
	r2 := NewConfigRegistry(path)
	val, err := r2.Get("k")
	if err != nil {
		t.Fatalf("Get after flush: %v", err)
	}
	if v, _ := val.(string); v != "v" {
		t.Fatalf("expected v, got %v", val)
	}
	r2.Close()
}

func TestRegistryFlushIdempotent(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.db")
	r := NewConfigRegistry(path)
	r.Set("k", "v")
	r.Flush()
	r.Flush() // second flush should not error
	r.Close()
}

func TestPluginConfig(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.db")
	r := NewConfigRegistry(path)

	ps := r.PluginConfig("test_deepseek")
	ps.RegisterDef(ConfigDef{Key: "api_key", Default: "sk-test123"})
	if err := ps.Set("api_key", "sk-test123"); err != nil {
		t.Fatalf("PluginSettings.Set: %v", err)
	}

	val, err := ps.Get("api_key")
	if err != nil {
		t.Fatalf("PluginSettings.Get: %v", err)
	}
	if v, _ := val.(string); v != "sk-test123" {
		t.Fatalf("expected sk-test123, got %v", val)
	}

	keys, err := ps.List("")
	if err != nil {
		t.Fatalf("PluginSettings.List: %v", err)
	}
	if len(keys) != 1 || keys[0] != "api_key" {
		t.Fatalf("expected [api_key], got %v", keys)
	}

	// Core table should not contain plugin data
	coreKeys := r.List("")
	for _, k := range coreKeys {
		if k == "api_key" {
			t.Fatal("plugin key leaked into core config table")
		}
	}

	r.Close()
}

func TestSeedDefaultsToConfig(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.db")

	r := NewConfigRegistry(path)
	r.SeedDefaults(dir)

	// Verify DB was seeded with expected number of keys
	keys := r.List("")
	if len(keys) == 0 {
		t.Fatal("SeedDefaults produced empty DB")
	}

	// Reconstruct config from DB
	cfg2 := r.ToConfig()

	if v := r.GetString("webui.listen_addr", ""); v != ":8080" {
		t.Fatalf("expected :8080, got %s", v)
	}
	if cfg2.LLM.Provider != "deepseek" {
		t.Fatalf("expected deepseek, got %s", cfg2.LLM.Provider)
	}
	if len(cfg2.LLM.Sources) == 0 {
		t.Fatal("expected at least 1 LLM source")
	}

	// Second SeedDefaults should be no-op (DB already has data)
	r.SeedDefaults(dir)
	if len(r.List("")) != len(keys) {
		t.Fatal("second SeedDefaults changed DB count")
	}

	r.Close()
}

func TestGetHelpers(t *testing.T) {
	r := NewConfigRegistry("")
	r.Set("str_key", "hello")
	r.Set("int_key", "42")
	r.Set("dur_key", "5m")
	r.Set("bool_key", "true")

	if got := r.GetString("str_key", ""); got != "hello" {
		t.Fatalf("GetString: expected hello, got %s", got)
	}
	if got := r.GetString("nonexistent", "fallback"); got != "fallback" {
		t.Fatalf("GetString fallback: expected fallback, got %s", got)
	}
	if got := r.GetInt("int_key", 0); got != 42 {
		t.Fatalf("GetInt: expected 42, got %d", got)
	}
	if got := r.GetInt("nonexistent", 99); got != 99 {
		t.Fatalf("GetInt fallback: expected 99, got %d", got)
	}
	if got := r.GetDuration("dur_key", 0); got != 5*time.Minute {
		t.Fatalf("GetDuration: expected 5m, got %v", got)
	}
	r.Set("dur_key_days", "2d")
	if got := r.GetDuration("dur_key_days", 0); got != 48*time.Hour {
		t.Fatalf("GetDuration d-unit: expected 48h, got %v", got)
	}
	r.Set("dur_key_weeks", "1w")
	if got := r.GetDuration("dur_key_weeks", 0); got != 168*time.Hour {
		t.Fatalf("GetDuration w-unit: expected 168h, got %v", got)
	}
	if got := r.GetDuration("nonexistent", 30*time.Second); got != 30*time.Second {
		t.Fatalf("GetDuration fallback: expected 30s, got %v", got)
	}
	if got := r.GetBool("bool_key", false); got != true {
		t.Fatalf("GetBool: expected true, got %v", got)
	}
	if got := r.GetBool("nonexistent", true); got != true {
		t.Fatalf("GetBool fallback: expected true, got %v", got)
	}
}

func TestParseDurationExtended(t *testing.T) {
	cases := []struct {
		in      string
		want    time.Duration
		wantErr bool
	}{
		{"2d", 48 * time.Hour, false},
		{"1w", 7 * 24 * time.Hour, false},
		{"1d", 24 * time.Hour, false},
		{"2d12h", 60 * time.Hour, false},
		{"30m", 30 * time.Minute, false},
		{"500ms", 500 * time.Millisecond, false},
		{"1h30m", 90 * time.Minute, false},
		{" 3d ", 72 * time.Hour, false},
		{"2w", 336 * time.Hour, false},
		{"", 0, true},
		{"abc", 0, true},
	}
	for _, c := range cases {
		got, err := parseDurationExtended(c.in)
		if c.wantErr {
			if err == nil {
				t.Errorf("%q: expected error, got %v", c.in, got)
			}
			continue
		}
		if err != nil {
			t.Errorf("%q: unexpected error: %v", c.in, err)
			continue
		}
		if got != c.want {
			t.Errorf("%q: expected %v, got %v", c.in, c.want, got)
		}
	}
}

func TestSnapshotRestoreCoreLLM(t *testing.T) {
	r := NewConfigRegistry("")
	defer r.Close()

	r.Set("core.llm.sources.main.base_url", "https://a")
	r.Set("core.llm.sources.main.model", "m1")
	r.Set("core.llm.sources.main.api_key", "k1")

	snap := r.SnapshotCoreLLM()
	if len(snap) != 3 {
		t.Fatalf("expected 3 keys, got %d: %v", len(snap), snap)
	}

	// 模拟写坏
	r.Set("core.llm.sources.main.base_url", "https://broken")
	r.Set("core.llm.sources.main.api_key", "hacked")
	r.Set("core.llm.sources.extra.model", "intruder")

	if err := r.RestoreCoreLLM(snap); err != nil {
		t.Fatalf("RestoreCoreLLM: %v", err)
	}
	got := r.SnapshotCoreLLM()
	if len(got) != 3 {
		t.Fatalf("after restore expected 3 keys, got %d: %v", len(got), got)
	}
	for k, v := range snap {
		if got[k] != v {
			t.Errorf("key %s: want %q got %q", k, v, got[k])
		}
	}
}

func TestLLMSnapshotFile(t *testing.T) {
	path := filepath.Join(t.TempDir(), "llm_snapshot.json")
	snap := map[string]string{"core.llm.sources.main.base_url": "https://a", "core.llm.sources.main.model": "m1"}
	if err := SaveLLMSnapshot(path, snap); err != nil {
		t.Fatalf("Save: %v", err)
	}
	got, err := LoadLLMSnapshot(path)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if got["core.llm.sources.main.base_url"] != "https://a" || got["core.llm.sources.main.model"] != "m1" {
		t.Fatalf("round-trip mismatch: %v", got)
	}
}

func TestSetLLMSnapshotFile(t *testing.T) {
	r := NewConfigRegistry("")
	defer r.Close()
	r.Set("core.llm.sources.main.base_url", "https://orig")
	r.Set("core.llm.sources.main.model", "m0")

	path := filepath.Join(t.TempDir(), "llm_pre.json")
	r.SetLLMSnapshotFile(path)
	// 再次写入：写前自动留档应记录当前值 orig/m0，随后才被覆盖
	r.Set("core.llm.sources.main.base_url", "https://broken")

	got, err := LoadLLMSnapshot(path)
	if err != nil {
		t.Fatalf("Load snapshot: %v", err)
	}
	if got["core.llm.sources.main.base_url"] != "https://orig" {
		t.Fatalf("write-ahead snapshot should record pre-write value, got %q", got["core.llm.sources.main.base_url"])
	}
	if got["core.llm.sources.main.model"] != "m0" {
		t.Fatalf("snapshot missing untouched key model: %v", got)
	}
}