package runtimeconfig

import (
	"encoding/json"
	"errors"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
)

func TestLoadPlugins_MissingFileIsEmpty(t *testing.T) {
	t.Parallel()
	got, err := LoadPlugins(filepath.Join(t.TempDir(), "plugins.json"))
	if err != nil {
		t.Fatalf("LoadPlugins: %v", err)
	}
	if len(got) != 0 {
		t.Fatalf("len = %d, want 0", len(got))
	}
}

func TestSaveLoadPlugins_RoundTrip(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "nested", "plugins.json")
	in := []PluginConfig{{
		ID:        "p1",
		Name:      "calc",
		Kind:      PluginKindMCP,
		Transport: TransportHTTP,
		Endpoint:  "http://127.0.0.1:3001/mcp",
		APIKey:    "sk-secret-1234",
		CreatedAt: "2026-09-08T00:00:00Z",
	}}
	if err := SavePlugins(path, in); err != nil {
		t.Fatalf("SavePlugins: %v", err)
	}
	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. SavePlugins still requests 0600 (see plugins.go).
		if perm := info.Mode().Perm(); perm != 0o600 {
			t.Fatalf("mode = %o, want 600", perm)
		}
	}
	got, err := LoadPlugins(path)
	if err != nil {
		t.Fatalf("LoadPlugins: %v", err)
	}
	if len(got) != 1 || got[0].Name != "calc" || got[0].APIKey != "sk-secret-1234" {
		t.Fatalf("got = %+v", got)
	}
}

func TestLoadPlugins_EmptyArrayIsValid(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "plugins.json")
	if err := os.WriteFile(path, []byte("[]"), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	got, err := LoadPlugins(path)
	if err != nil {
		t.Fatalf("LoadPlugins: %v", err)
	}
	if len(got) != 0 {
		t.Fatalf("len = %d, want 0", len(got))
	}
}

func TestLoadPlugins_InvalidReturnsError(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "plugins.json")
	if err := os.WriteFile(path, []byte(`[{"name":""}]`), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	if _, err := LoadPlugins(path); !errors.Is(err, ErrInvalidPlugin) {
		t.Fatalf("err = %v, want ErrInvalidPlugin", err)
	}
}

func TestValidatePlugin(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name    string
		cfg     PluginConfig
		wantErr bool
	}{
		{name: "stdio ok", cfg: PluginConfig{Name: "a", Command: "mcp-a"}},
		{name: "http ok", cfg: PluginConfig{Name: "b", Endpoint: "http://x/mcp"}},
		{name: "sse ok", cfg: PluginConfig{Name: "c", Transport: TransportSSE, Endpoint: "http://x/sse"}},
		{name: "blank name", cfg: PluginConfig{Command: "x"}, wantErr: true},
		{name: "bad kind", cfg: PluginConfig{Name: "d", Kind: "tool", Command: "x"}, wantErr: true},
		{name: "stdio no command", cfg: PluginConfig{Name: "e", Transport: TransportStdio}, wantErr: true},
		{name: "http no endpoint", cfg: PluginConfig{Name: "f", Transport: TransportHTTP}, wantErr: true},
		{name: "bad transport", cfg: PluginConfig{Name: "g", Transport: "carrier-pigeon", Endpoint: "http://x"}, wantErr: true},
		{name: "no transport no fields", cfg: PluginConfig{Name: "h"}, wantErr: true},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			err := tc.cfg.Validate()
			if tc.wantErr && err == nil {
				t.Fatal("want error, got nil")
			}
			if !tc.wantErr && err != nil {
				t.Fatalf("unexpected error: %v", err)
			}
		})
	}
}

func TestUpsertPlugin_ByNameReplacesAndPreservesOrder(t *testing.T) {
	t.Parallel()
	base := []PluginConfig{
		{ID: "1", Name: "a", Command: "a"},
		{ID: "2", Name: "b", Command: "b"},
	}
	got := UpsertPlugin(base, PluginConfig{Name: "b", Command: "b2"})
	if len(got) != 2 {
		t.Fatalf("len = %d, want 2", len(got))
	}
	if got[1].Name != "b" || got[1].Command != "b2" {
		t.Fatalf("got[1] = %+v", got[1])
	}
	got = UpsertPlugin(got, PluginConfig{Name: "c", Command: "c"})
	if len(got) != 3 || got[2].Name != "c" || got[2].ID == "" {
		t.Fatalf("append = %+v", got)
	}
}

func TestDeletePlugin(t *testing.T) {
	t.Parallel()
	base := []PluginConfig{{ID: "1", Name: "a", Command: "a"}, {ID: "2", Name: "b", Command: "b"}}
	got, removed := DeletePlugin(base, "a")
	if !removed || len(got) != 1 || got[0].Name != "b" {
		t.Fatalf("removed=%v got=%+v", removed, got)
	}
	got, removed = DeletePlugin(base, "2")
	if !removed || len(got) != 1 || got[0].Name != "a" {
		t.Fatalf("by id: removed=%v got=%+v", removed, got)
	}
	if _, removed := DeletePlugin(base, "nope"); removed {
		t.Fatal("removed = true for unknown name")
	}
}

func TestMaskedPlugin_EmptySecretsStayEmpty(t *testing.T) {
	t.Parallel()
	got := MaskedPlugin(PluginConfig{Name: "calc", Env: map[string]string{"API_KEY": ""}})
	if got.APIKey != "" {
		t.Fatalf("apiKey = %q, want empty", got.APIKey)
	}
	if got.Env["API_KEY"] != "" {
		t.Fatalf("empty env secret = %q, want empty", got.Env["API_KEY"])
	}
}

func TestMaskedPlugin_RedactsKeyAndEnv(t *testing.T) {
	t.Parallel()
	p := PluginConfig{
		Name:   "calc",
		APIKey: "sk-secret-1234",
		Env:    map[string]string{"PATH": "/usr/bin", "GITHUB_TOKEN": "ghp-abcdefgh"},
	}
	got := MaskedPlugin(p)
	if got.APIKey != "****1234" {
		t.Fatalf("apiKey = %q, want ****1234", got.APIKey)
	}
	if got.Env["PATH"] != "/usr/bin" {
		t.Fatalf("PATH = %q, want unchanged", got.Env["PATH"])
	}
	if got.Env["GITHUB_TOKEN"] != "****efgh" {
		t.Fatalf("GITHUB_TOKEN = %q, want masked", got.Env["GITHUB_TOKEN"])
	}
	if p.APIKey != "sk-secret-1234" {
		t.Fatal("original mutated")
	}
	raw, _ := json.Marshal(got)
	if strings.Contains(string(raw), "sk-secret-1234") || strings.Contains(string(raw), "ghp-abcdefgh") {
		t.Fatalf("masked JSON leaks a secret: %s", raw)
	}
}