// Package main provides the entry point for the CLI Proxy API server.
// This server acts as a proxy that provides OpenAI/Gemini/Claude compatible API interfaces
// for CLI models, allowing CLI models to be used with tools and libraries designed for standard AI APIs.
package main

import (
	"context"
	"errors"
	"flag"
	"fmt"
	"io/fs"
	"net/url"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/joho/godotenv"
	configaccess "github.com/router-for-me/CLIProxyAPI/v6/internal/access/config_access"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/buildinfo"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/cmd"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/logging"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/managementasset"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/misc"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/store"
	_ "github.com/router-for-me/CLIProxyAPI/v6/internal/translator"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/usage"
	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
	sdkAuth "github.com/router-for-me/CLIProxyAPI/v6/sdk/auth"
	coreauth "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/auth"
	log "github.com/sirupsen/logrus"
)

var (
	Version           = "dev"
	Commit            = "none"
	BuildDate         = "unknown"
	DefaultConfigPath = ""
)

// init initializes the shared logger setup.
func init() {
	logging.SetupBaseLogger()
	buildinfo.Version = Version
	buildinfo.Commit = Commit
	buildinfo.BuildDate = BuildDate
}

// main is the entry point of the application.
// It parses command-line flags, loads configuration, and starts the appropriate
// service based on the provided flags (login, codex-login, or server mode).
func main() {
	fmt.Printf("CLIProxyAPI Version: %s, Commit: %s, BuiltAt: %s\n", buildinfo.Version, buildinfo.Commit, buildinfo.BuildDate)

	// Command-line flags to control the application's behavior.
	var login bool
	var codexLogin bool
	var claudeLogin bool
	var qwenLogin bool
	var iflowLogin bool
	var iflowCookie bool
	var noBrowser bool
	var oauthCallbackPort int
	var antigravityLogin bool
	var projectID string
	var vertexImport string
	var configPath string
	var password string

	// Define command-line flags for different operation modes.
	flag.BoolVar(&login, "login", false, "Login Google Account")
	flag.BoolVar(&codexLogin, "codex-login", false, "Login to Codex using OAuth")
	flag.BoolVar(&claudeLogin, "claude-login", false, "Login to Claude using OAuth")
	flag.BoolVar(&qwenLogin, "qwen-login", false, "Login to Qwen using OAuth")
	flag.BoolVar(&iflowLogin, "iflow-login", false, "Login to iFlow using OAuth")
	flag.BoolVar(&iflowCookie, "iflow-cookie", false, "Login to iFlow using Cookie")
	flag.BoolVar(&noBrowser, "no-browser", false, "Don't open browser automatically for OAuth")
	flag.IntVar(&oauthCallbackPort, "oauth-callback-port", 0, "Override OAuth callback port (defaults to provider-specific port)")
	flag.BoolVar(&antigravityLogin, "antigravity-login", false, "Login to Antigravity using OAuth")
	flag.StringVar(&projectID, "project_id", "", "Project ID (Gemini only, not required)")
	flag.StringVar(&configPath, "config", DefaultConfigPath, "Configure File Path")
	flag.StringVar(&vertexImport, "vertex-import", "", "Import Vertex service account key JSON file")
	flag.StringVar(&password, "password", "", "")

	flag.CommandLine.Usage = func() {
		out := flag.CommandLine.Output()
		_, _ = fmt.Fprintf(out, "Usage of %s\n", os.Args[0])
		flag.CommandLine.VisitAll(func(f *flag.Flag) {
			if f.Name == "password" {
				return
			}
			s := fmt.Sprintf("  -%s", f.Name)
			name, unquoteUsage := flag.UnquoteUsage(f)
			if name != "" {
				s += " " + name
			}
			if len(s) <= 4 {
				s += "	"
			} else {
				s += "\n    "
			}
			if unquoteUsage != "" {
				s += unquoteUsage
			}
			if f.DefValue != "" && f.DefValue != "false" && f.DefValue != "0" {
				s += fmt.Sprintf(" (default %s)", f.DefValue)
			}
			_, _ = fmt.Fprint(out, s+"\n")
		})
	}

	// Parse the command-line flags.
	flag.Parse()

	// Core application variables.
	var err error
	var cfg *config.Config
	var isCloudDeploy bool
	var (
		usePostgresStore     bool
		pgStoreDSN           string
		pgStoreSchema        string
		pgStoreLocalPath     string
		pgStoreInst          *store.PostgresStore
		useGitStore          bool
		gitStoreRemoteURL    string
		gitStoreUser         string
		gitStorePassword     string
		gitStoreLocalPath    string
		gitStoreInst         *store.GitTokenStore
		gitStoreRoot         string
		useObjectStore       bool
		objectStoreEndpoint  string
		objectStoreAccess    string
		objectStoreSecret    string
		objectStoreBucket    string
		objectStoreLocalPath string
		objectStoreInst      *store.ObjectTokenStore
	)

	wd, err := os.Getwd()
	if err != nil {
		log.Errorf("failed to get working directory: %v", err)
		return
	}

	// Load environment variables from .env if present.
	if errLoad := godotenv.Load(filepath.Join(wd, ".env")); errLoad != nil {
		if !errors.Is(errLoad, os.ErrNotExist) {
			log.WithError(errLoad).Warn("failed to load .env file")
		}
	}

	lookupEnv := func(keys ...string) (string, bool) {
		for _, key := range keys {
			if value, ok := os.LookupEnv(key); ok {
				if trimmed := strings.TrimSpace(value); trimmed != "" {
					return trimmed, true
				}
			}
		}
		return "", false
	}
	writableBase := util.WritablePath()
	if value, ok := lookupEnv("PGSTORE_DSN", "pgstore_dsn"); ok {
		usePostgresStore = true
		pgStoreDSN = value
	}
	if usePostgresStore {
		if value, ok := lookupEnv("PGSTORE_SCHEMA", "pgstore_schema"); ok {
			pgStoreSchema = value
		}
		if value, ok := lookupEnv("PGSTORE_LOCAL_PATH", "pgstore_local_path"); ok {
			pgStoreLocalPath = value
		}
		if pgStoreLocalPath == "" {
			if writableBase != "" {
				pgStoreLocalPath = writableBase
			} else {
				pgStoreLocalPath = wd
			}
		}
		useGitStore = false
	}
	if value, ok := lookupEnv("GITSTORE_GIT_URL", "gitstore_git_url"); ok {
		useGitStore = true
		gitStoreRemoteURL = value
	}
	if value, ok := lookupEnv("GITSTORE_GIT_USERNAME", "gitstore_git_username"); ok {
		gitStoreUser = value
	}
	if value, ok := lookupEnv("GITSTORE_GIT_TOKEN", "gitstore_git_token"); ok {
		gitStorePassword = value
	}
	if value, ok := lookupEnv("GITSTORE_LOCAL_PATH", "gitstore_local_path"); ok {
		gitStoreLocalPath = value
	}
	if value, ok := lookupEnv("OBJECTSTORE_ENDPOINT", "objectstore_endpoint"); ok {
		useObjectStore = true
		objectStoreEndpoint = value
	}
	if value, ok := lookupEnv("OBJECTSTORE_ACCESS_KEY", "objectstore_access_key"); ok {
		objectStoreAccess = value
	}
	if value, ok := lookupEnv("OBJECTSTORE_SECRET_KEY", "objectstore_secret_key"); ok {
		objectStoreSecret = value
	}
	if value, ok := lookupEnv("OBJECTSTORE_BUCKET", "objectstore_bucket"); ok {
		objectStoreBucket = value
	}
	if value, ok := lookupEnv("OBJECTSTORE_LOCAL_PATH", "objectstore_local_path"); ok {
		objectStoreLocalPath = value
	}

	// Check for cloud deploy mode only on first execution
	// Read env var name in uppercase: DEPLOY
	deployEnv := os.Getenv("DEPLOY")
	if deployEnv == "cloud" {
		isCloudDeploy = true
	}

	// Determine and load the configuration file.
	// Prefer the Postgres store when configured, otherwise fallback to git or local files.
	var configFilePath string
	if usePostgresStore {
		if pgStoreLocalPath == "" {
			pgStoreLocalPath = wd
		}
		pgStoreLocalPath = filepath.Join(pgStoreLocalPath, "pgstore")
		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		pgStoreInst, err = store.NewPostgresStore(ctx, store.PostgresStoreConfig{
			DSN:      pgStoreDSN,
			Schema:   pgStoreSchema,
			SpoolDir: pgStoreLocalPath,
		})
		cancel()
		if err != nil {
			log.Errorf("failed to initialize postgres token store: %v", err)
			return
		}
		examplePath := filepath.Join(wd, "config.example.yaml")
		ctx, cancel = context.WithTimeout(context.Background(), 30*time.Second)
		if errBootstrap := pgStoreInst.Bootstrap(ctx, examplePath); errBootstrap != nil {
			cancel()
			log.Errorf("failed to bootstrap postgres-backed config: %v", errBootstrap)
			return
		}
		cancel()
		configFilePath = pgStoreInst.ConfigPath()
		cfg, err = config.LoadConfigOptional(configFilePath, isCloudDeploy)
		if err == nil {
			cfg.AuthDir = pgStoreInst.AuthDir()
			log.Infof("postgres-backed token store enabled, workspace path: %s", pgStoreInst.WorkDir())
		}
	} else if useObjectStore {
		if objectStoreLocalPath == "" {
			if writableBase != "" {
				objectStoreLocalPath = writableBase
			} else {
				objectStoreLocalPath = wd
			}
		}
		objectStoreRoot := filepath.Join(objectStoreLocalPath, "objectstore")
		resolvedEndpoint := strings.TrimSpace(objectStoreEndpoint)
		useSSL := true
		if strings.Contains(resolvedEndpoint, "://") {
			parsed, errParse := url.Parse(resolvedEndpoint)
			if errParse != nil {
				log.Errorf("failed to parse object store endpoint %q: %v", objectStoreEndpoint, errParse)
				return
			}
			switch strings.ToLower(parsed.Scheme) {
			case "http":
				useSSL = false
			case "https":
				useSSL = true
			default:
				log.Errorf("unsupported object store scheme %q (only http and https are allowed)", parsed.Scheme)
				return
			}
			if parsed.Host == "" {
				log.Errorf("object store endpoint %q is missing host information", objectStoreEndpoint)
				return
			}
			resolvedEndpoint = parsed.Host
			if parsed.Path != "" && parsed.Path != "/" {
				resolvedEndpoint = strings.TrimSuffix(parsed.Host+parsed.Path, "/")
			}
		}
		resolvedEndpoint = strings.TrimRight(resolvedEndpoint, "/")
		objCfg := store.ObjectStoreConfig{
			Endpoint:  resolvedEndpoint,
			Bucket:    objectStoreBucket,
			AccessKey: objectStoreAccess,
			SecretKey: objectStoreSecret,
			LocalRoot: objectStoreRoot,
			UseSSL:    useSSL,
			PathStyle: true,
		}
		objectStoreInst, err = store.NewObjectTokenStore(objCfg)
		if err != nil {
			log.Errorf("failed to initialize object token store: %v", err)
			return
		}
		examplePath := filepath.Join(wd, "config.example.yaml")
		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		if errBootstrap := objectStoreInst.Bootstrap(ctx, examplePath); errBootstrap != nil {
			cancel()
			log.Errorf("failed to bootstrap object-backed config: %v", errBootstrap)
			return
		}
		cancel()
		configFilePath = objectStoreInst.ConfigPath()
		cfg, err = config.LoadConfigOptional(configFilePath, isCloudDeploy)
		if err == nil {
			if cfg == nil {
				cfg = &config.Config{}
			}
			cfg.AuthDir = objectStoreInst.AuthDir()
			log.Infof("object-backed token store enabled, bucket: %s", objectStoreBucket)
		}
	} else if useGitStore {
		if gitStoreLocalPath == "" {
			if writableBase != "" {
				gitStoreLocalPath = writableBase
			} else {
				gitStoreLocalPath = wd
			}
		}
		gitStoreRoot = filepath.Join(gitStoreLocalPath, "gitstore")
		authDir := filepath.Join(gitStoreRoot, "auths")
		gitStoreInst = store.NewGitTokenStore(gitStoreRemoteURL, gitStoreUser, gitStorePassword)
		gitStoreInst.SetBaseDir(authDir)
		if errRepo := gitStoreInst.EnsureRepository(); errRepo != nil {
			log.Errorf("failed to prepare git token store: %v", errRepo)
			return
		}
		configFilePath = gitStoreInst.ConfigPath()
		if configFilePath == "" {
			configFilePath = filepath.Join(gitStoreRoot, "config", "config.yaml")
		}
		if _, statErr := os.Stat(configFilePath); errors.Is(statErr, fs.ErrNotExist) {
			examplePath := filepath.Join(wd, "config.example.yaml")
			if _, errExample := os.Stat(examplePath); errExample != nil {
				log.Errorf("failed to find template config file: %v", errExample)
				return
			}
			if errCopy := misc.CopyConfigTemplate(examplePath, configFilePath); errCopy != nil {
				log.Errorf("failed to bootstrap git-backed config: %v", errCopy)
				return
			}
			if errCommit := gitStoreInst.PersistConfig(context.Background()); errCommit != nil {
				log.Errorf("failed to commit initial git-backed config: %v", errCommit)
				return
			}
			log.Infof("git-backed config initialized from template: %s", configFilePath)
		} else if statErr != nil {
			log.Errorf("failed to inspect git-backed config: %v", statErr)
			return
		}
		cfg, err = config.LoadConfigOptional(configFilePath, isCloudDeploy)
		if err == nil {
			cfg.AuthDir = gitStoreInst.AuthDir()
			log.Infof("git-backed token store enabled, repository path: %s", gitStoreRoot)
		}
	} else if configPath != "" {
		configFilePath = configPath
		cfg, err = config.LoadConfigOptional(configPath, isCloudDeploy)
	} else {
		wd, err = os.Getwd()
		if err != nil {
			log.Errorf("failed to get working directory: %v", err)
			return
		}
		configFilePath = filepath.Join(wd, "config.yaml")
		cfg, err = config.LoadConfigOptional(configFilePath, isCloudDeploy)
	}
	if err != nil {
		log.Errorf("failed to load config: %v", err)
		return
	}
	if cfg == nil {
		cfg = &config.Config{}
	}

	// In cloud deploy mode, check if we have a valid configuration
	var configFileExists bool
	if isCloudDeploy {
		if info, errStat := os.Stat(configFilePath); errStat != nil {
			// Don't mislead: API server will not start until configuration is provided.
			log.Info("Cloud deploy mode: No configuration file detected; standing by for configuration")
			configFileExists = false
		} else if info.IsDir() {
			log.Info("Cloud deploy mode: Config path is a directory; standing by for configuration")
			configFileExists = false
		} else if cfg.Port == 0 {
			// LoadConfigOptional returns empty config when file is empty or invalid.
			// Config file exists but is empty or invalid; treat as missing config
			log.Info("Cloud deploy mode: Configuration file is empty or invalid; standing by for valid configuration")
			configFileExists = false
		} else {
			log.Info("Cloud deploy mode: Configuration file detected; starting service")
			configFileExists = true
		}
	}
	usage.SetStatisticsEnabled(cfg.UsageStatisticsEnabled)
	coreauth.SetQuotaCooldownDisabled(cfg.DisableCooling)

	if err = logging.ConfigureLogOutput(cfg); err != nil {
		log.Errorf("failed to configure log output: %v", err)
		return
	}

	log.Infof("CLIProxyAPI Version: %s, Commit: %s, BuiltAt: %s", buildinfo.Version, buildinfo.Commit, buildinfo.BuildDate)

	// Set the log level based on the configuration.
	util.SetLogLevel(cfg)

	if resolvedAuthDir, errResolveAuthDir := util.ResolveAuthDir(cfg.AuthDir); errResolveAuthDir != nil {
		log.Errorf("failed to resolve auth directory: %v", errResolveAuthDir)
		return
	} else {
		cfg.AuthDir = resolvedAuthDir
	}
	managementasset.SetCurrentConfig(cfg)

	// Create login options to be used in authentication flows.
	options := &cmd.LoginOptions{
		NoBrowser:    noBrowser,
		CallbackPort: oauthCallbackPort,
	}

	// Register the shared token store once so all components use the same persistence backend.
	if usePostgresStore {
		sdkAuth.RegisterTokenStore(pgStoreInst)
	} else if useObjectStore {
		sdkAuth.RegisterTokenStore(objectStoreInst)
	} else if useGitStore {
		sdkAuth.RegisterTokenStore(gitStoreInst)
	} else {
		sdkAuth.RegisterTokenStore(sdkAuth.NewFileTokenStore())
	}

	// Register built-in access providers before constructing services.
	configaccess.Register()

	// Handle different command modes based on the provided flags.

	if vertexImport != "" {
		// Handle Vertex service account import
		cmd.DoVertexImport(cfg, vertexImport)
	} else if login {
		// Handle Google/Gemini login
		cmd.DoLogin(cfg, projectID, options)
	} else if antigravityLogin {
		// Handle Antigravity login
		cmd.DoAntigravityLogin(cfg, options)
	} else if codexLogin {
		// Handle Codex login
		cmd.DoCodexLogin(cfg, options)
	} else if claudeLogin {
		// Handle Claude login
		cmd.DoClaudeLogin(cfg, options)
	} else if qwenLogin {
		cmd.DoQwenLogin(cfg, options)
	} else if iflowLogin {
		cmd.DoIFlowLogin(cfg, options)
	} else if iflowCookie {
		cmd.DoIFlowCookieAuth(cfg, options)
	} else {
		// In cloud deploy mode without config file, just wait for shutdown signals
		if isCloudDeploy && !configFileExists {
			// No config file available, just wait for shutdown
			cmd.WaitForCloudDeploy()
			return
		}
		// Start the main proxy service
		managementasset.StartAutoUpdater(context.Background(), configFilePath)
		cmd.StartService(cfg, configFilePath, password)
	}
}