package pluginhost

import (
	"context"
	"encoding/json"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/router-for-me/CLIProxyAPI/v7/internal/config"
	"github.com/router-for-me/CLIProxyAPI/v7/sdk/pluginapi"
)

func TestAuthProviderDiscovery(t *testing.T) {
	host := newHostWithRecords(
		capabilityRecord{
			id:       "high",
			priority: 20,
			plugin: pluginapi.Plugin{Capabilities: pluginapi.Capabilities{
				AuthProvider: fakeAuthProvider{identifier: " High-Provider "},
			}},
		},
		capabilityRecord{
			id:       "low",
			priority: 10,
			plugin: pluginapi.Plugin{Capabilities: pluginapi.Capabilities{
				AuthProvider: fakeAuthProvider{identifier: "low-provider"},
			}},
		},
		capabilityRecord{
			id: "missing-auth-provider",
			plugin: pluginapi.Plugin{Capabilities: pluginapi.Capabilities{
				ModelRegistrar: staticModelRegistrar("provider", "model"),
			}},
		},
	)

	identifiers := host.AuthProviderIdentifiers()
	if len(identifiers) != 2 || identifiers[0] != "high-provider" || identifiers[1] != "low-provider" {
		t.Fatalf("AuthProviderIdentifiers() = %#v, want sorted normalized providers", identifiers)
	}
	if !host.HasAuthProvider(" HIGH-PROVIDER ") {
		t.Fatal("HasAuthProvider(high-provider) = false, want true")
	}
	if host.HasAuthProvider("missing-provider") {
		t.Fatal("HasAuthProvider(missing-provider) = true, want false")
	}
}

func TestParseAuthDefaultsProviderFromRequest(t *testing.T) {
	host := newHostWithRecords(capabilityRecord{
		id: "auth-plugin",
		plugin: pluginapi.Plugin{
			Capabilities: pluginapi.Capabilities{
				AuthProvider: fakeAuthProvider{
					identifier: "plugin-provider",
					parseAuth: func(ctx context.Context, req pluginapi.AuthParseRequest) (pluginapi.AuthParseResponse, error) {
						return pluginapi.AuthParseResponse{
							Handled: true,
							Auth: pluginapi.AuthData{
								ID: "auth-1",
							},
						}, nil
					},
				},
			},
		},
	})

	auth, handled, errParse := host.ParseAuth(context.Background(), pluginapi.AuthParseRequest{Provider: "plugin-provider"})
	if errParse != nil {
		t.Fatalf("ParseAuth() error = %v", errParse)
	}
	if !handled || auth == nil {
		t.Fatalf("ParseAuth() handled=%t auth=%#v, want parsed auth", handled, auth)
	}
	if auth.Provider != "plugin-provider" || auth.Metadata["type"] != "plugin-provider" {
		t.Fatalf("ParseAuth() auth = %#v, want plugin-provider defaults", auth)
	}
}

func TestParseAuthDefaultsProviderFromAuthProviderIdentifier(t *testing.T) {
	seenProvider := ""
	host := newHostWithRecords(capabilityRecord{
		id: "auth-plugin",
		plugin: pluginapi.Plugin{
			Capabilities: pluginapi.Capabilities{
				AuthProvider: fakeAuthProvider{
					identifier: "Plugin-Provider",
					parseAuth: func(ctx context.Context, req pluginapi.AuthParseRequest) (pluginapi.AuthParseResponse, error) {
						seenProvider = req.Provider
						return pluginapi.AuthParseResponse{
							Handled: true,
							Auth: pluginapi.AuthData{
								ID: "auth-1",
							},
						}, nil
					},
				},
			},
		},
	})

	auth, handled, errParse := host.ParseAuth(context.Background(), pluginapi.AuthParseRequest{})
	if errParse != nil {
		t.Fatalf("ParseAuth() error = %v", errParse)
	}
	if !handled || auth == nil {
		t.Fatalf("ParseAuth() handled=%t auth=%#v, want parsed auth", handled, auth)
	}
	if seenProvider != "plugin-provider" {
		t.Fatalf("plugin parse request provider = %q, want plugin-provider", seenProvider)
	}
	if auth.Provider != "plugin-provider" || auth.Metadata["type"] != "plugin-provider" {
		t.Fatalf("ParseAuth() auth = %#v, want identifier provider fallback", auth)
	}
}

func TestStartLoginPassesProviderBaseURLHostAndHTTPClient(t *testing.T) {
	authDir := t.TempDir()
	expiresAt := time.Now().Add(time.Minute).UTC()
	called := false
	host := newHostWithRecords(capabilityRecord{
		id: "auth-plugin",
		plugin: pluginapi.Plugin{
			Capabilities: pluginapi.Capabilities{
				AuthProvider: fakeAuthProvider{
					identifier: "plugin-provider",
					startLogin: func(ctx context.Context, req pluginapi.AuthLoginStartRequest) (pluginapi.AuthLoginStartResponse, error) {
						called = true
						if req.Provider != "plugin-provider" || req.BaseURL != "http://localhost:8080/login" {
							t.Fatalf("StartLogin request = %#v, want provider/baseURL", req)
						}
						if req.Host.AuthDir != authDir || req.Host.ProxyURL != "http://proxy.local" || !req.Host.ForceModelPrefix {
							t.Fatalf("StartLogin host = %#v, want configured summary", req.Host)
						}
						if req.HTTPClient == nil {
							t.Fatal("StartLogin HTTPClient = nil, want host HTTP bridge")
						}
						return pluginapi.AuthLoginStartResponse{
							Provider:  req.Provider,
							URL:       "http://provider/login",
							State:     "state-1",
							ExpiresAt: expiresAt,
						}, nil
					},
				},
			},
		},
	})
	host.runtimeConfig = &config.Config{
		SDKConfig: config.SDKConfig{
			ProxyURL:         "http://proxy.local",
			ForceModelPrefix: true,
		},
		AuthDir: authDir,
	}

	resp, handled, errStart := host.StartLogin(context.Background(), " Plugin-Provider ", "http://localhost:8080/login")
	if errStart != nil {
		t.Fatalf("StartLogin() error = %v", errStart)
	}
	if !handled || !called {
		t.Fatalf("StartLogin() handled=%t called=%t, want handled call", handled, called)
	}
	if resp.Provider != "plugin-provider" || resp.URL != "http://provider/login" || resp.State != "state-1" || !resp.ExpiresAt.Equal(expiresAt) {
		t.Fatalf("StartLogin() response = %#v, want plugin response", resp)
	}
}

func TestPollLoginPassesProviderStateHostAndHTTPClient(t *testing.T) {
	authDir := t.TempDir()
	called := false
	host := newHostWithRecords(capabilityRecord{
		id: "auth-plugin",
		plugin: pluginapi.Plugin{
			Capabilities: pluginapi.Capabilities{
				AuthProvider: fakeAuthProvider{
					identifier: "plugin-provider",
					pollLogin: func(ctx context.Context, req pluginapi.AuthLoginPollRequest) (pluginapi.AuthLoginPollResponse, error) {
						called = true
						if req.Provider != "plugin-provider" || req.State != "state-1" {
							t.Fatalf("PollLogin request = %#v, want provider/state", req)
						}
						if req.Host.AuthDir != authDir || req.Host.ProxyURL != "http://proxy.local" || !req.Host.ForceModelPrefix {
							t.Fatalf("PollLogin host = %#v, want configured summary", req.Host)
						}
						if req.HTTPClient == nil {
							t.Fatal("PollLogin HTTPClient = nil, want host HTTP bridge")
						}
						return pluginapi.AuthLoginPollResponse{
							Status:  pluginapi.AuthLoginStatusSuccess,
							Message: "done",
							Auth: pluginapi.AuthData{
								Provider: "plugin-provider",
								ID:       "auth-1",
							},
						}, nil
					},
				},
			},
		},
	})
	host.runtimeConfig = &config.Config{
		SDKConfig: config.SDKConfig{
			ProxyURL:         "http://proxy.local",
			ForceModelPrefix: true,
		},
		AuthDir: authDir,
	}

	resp, handled, errPoll := host.PollLogin(context.Background(), " Plugin-Provider ", " state-1 ")
	if errPoll != nil {
		t.Fatalf("PollLogin() error = %v", errPoll)
	}
	if !handled || !called {
		t.Fatalf("PollLogin() handled=%t called=%t, want handled call", handled, called)
	}
	if resp.Status != pluginapi.AuthLoginStatusSuccess || resp.Message != "done" || resp.Auth.ID != "auth-1" {
		t.Fatalf("PollLogin() response = %#v, want plugin response", resp)
	}
}

func TestHostAuthDataToCoreAuthRejectsMissingProviderAndUsesAuthDir(t *testing.T) {
	authDir := t.TempDir()
	host := New()
	host.runtimeConfig = &config.Config{AuthDir: authDir}
	path := filepath.Join(authDir, "nested", "auth.json")

	if auth := host.AuthDataToCoreAuth(pluginapi.AuthData{ID: "auth-1"}, path, "auth.json"); auth != nil {
		t.Fatalf("AuthDataToCoreAuth() = %#v, want nil for missing provider", auth)
	}
	auth := host.AuthDataToCoreAuth(pluginapi.AuthData{Provider: "Plugin-Provider"}, path, "")
	if auth == nil {
		t.Fatal("AuthDataToCoreAuth() = nil, want auth")
	}
	if auth.Provider != "plugin-provider" || auth.ID != "nested/auth.json" {
		t.Fatalf("AuthDataToCoreAuth() auth = %#v, want normalized provider and relative ID", auth)
	}
	if auth.Metadata["type"] != "plugin-provider" || auth.Attributes["path"] != path || auth.Attributes["source"] != path {
		t.Fatalf("AuthDataToCoreAuth() metadata=%#v attributes=%#v, want path/source/type", auth.Metadata, auth.Attributes)
	}
}

func TestPluginTokenStorageMergesRawMetadataAndProviderType(t *testing.T) {
	storage := &pluginTokenStorage{
		provider: "plugin-provider",
		rawJSON:  []byte(`{"old":"value","type":"old-provider"}`),
	}
	storage.SetMetadata(map[string]any{
		"new": "value",
		"old": "override",
	})

	raw := storage.RawJSON()
	var decoded map[string]any
	if errUnmarshal := json.Unmarshal(raw, &decoded); errUnmarshal != nil {
		t.Fatalf("RawJSON() decode error = %v", errUnmarshal)
	}
	if decoded["old"] != "override" || decoded["new"] != "value" || decoded["type"] != "plugin-provider" {
		t.Fatalf("RawJSON() decoded = %#v, want merged metadata and provider type", decoded)
	}

	path := filepath.Join(t.TempDir(), "auth.json")
	if errSave := storage.SaveTokenToFile(path); errSave != nil {
		t.Fatalf("SaveTokenToFile() error = %v", errSave)
	}
	saved, errReadFile := os.ReadFile(path)
	if errReadFile != nil {
		t.Fatalf("ReadFile(saved token) error = %v", errReadFile)
	}
	decoded = nil
	if errUnmarshal := json.Unmarshal(saved, &decoded); errUnmarshal != nil {
		t.Fatalf("saved token decode error = %v", errUnmarshal)
	}
	if decoded["old"] != "override" || decoded["new"] != "value" || decoded["type"] != "plugin-provider" {
		t.Fatalf("saved token decoded = %#v, want merged metadata and provider type", decoded)
	}
}

func TestPluginTokenStorageSkipsUnchangedFile(t *testing.T) {
	path := filepath.Join(t.TempDir(), "auth.json")
	if errWriteFile := os.WriteFile(path, []byte(`{"disabled":false,"token":"secret","type":"plugin-provider"}`), 0o600); errWriteFile != nil {
		t.Fatalf("WriteFile() error = %v", errWriteFile)
	}
	before, errStatBefore := os.Stat(path)
	if errStatBefore != nil {
		t.Fatalf("Stat(before) error = %v", errStatBefore)
	}
	storage := &pluginTokenStorage{
		provider: "plugin-provider",
		rawJSON:  []byte(`{"token":"secret"}`),
	}
	storage.SetMetadata(map[string]any{"disabled": false})

	if errSave := storage.SaveTokenToFile(path); errSave != nil {
		t.Fatalf("SaveTokenToFile() error = %v", errSave)
	}
	after, errStatAfter := os.Stat(path)
	if errStatAfter != nil {
		t.Fatalf("Stat(after) error = %v", errStatAfter)
	}
	if !os.SameFile(before, after) {
		t.Fatal("SaveTokenToFile() replaced unchanged auth file, want write skipped")
	}
}

func TestPluginTokenStorageRejectsEmptyPayload(t *testing.T) {
	storage := &pluginTokenStorage{}
	if raw := storage.RawJSON(); raw != nil {
		t.Fatalf("RawJSON() = %q, want nil for empty payload", raw)
	}
	if errSave := storage.SaveTokenToFile(filepath.Join(t.TempDir(), "auth.json")); errSave == nil {
		t.Fatal("SaveTokenToFile() error = nil, want empty payload error")
	}
}