package config

import (
	"context"
	"fmt"
	"net"
	"os"
	"path"

	"github.com/bluesky-social/indigo/atproto/syntax"
	"github.com/sethvargo/go-envconfig"
	"gopkg.in/yaml.v3"
)

type Config struct {
	Dev               bool       `yaml:"dev"`
	HostName          string     `yaml:"hostname"`
	OwnerDid          syntax.DID `yaml:"owner_did"`
	ListenHost        string     `yaml:"listen_host"`
	ListenPort        string     `yaml:"listen_port"`
	DataDir           string     `yaml:"data_dir"`
	RepoDir           string     `yaml:"repo_dir"`
	PlcUrl            string     `yaml:"plc_url"`
	JetstreamEndpoint string     `yaml:"jetstream_endpoint"`
	AppviewEndpoint   string     `yaml:"appview_endpoint"`
	GitUserName       string     `yaml:"git_user_name"`
	GitUserEmail      string     `yaml:"git_user_email"`
	OAuth             OAuthConfig
}

type OAuthConfig struct {
	CookieSecret string `env:"KNOT2_COOKIE_SECRET, default=00000000000000000000000000000000"`
	ClientSecret string `env:"KNOT2_OAUTH_CLIENT_SECRET"`
	ClientKid    string `env:"KNOT2_OAUTH_CLIENT_KID"`
}

func (c *Config) Uri() string {
	// TODO: make port configurable
	if c.Dev {
		return "http://127.0.0.1:6444"
	}
	return "https://" + c.HostName
}

func (c *Config) ListenAddr() string {
	return net.JoinHostPort(c.ListenHost, c.ListenPort)
}

func (c *Config) DbPath() string {
	return path.Join(c.DataDir, "knot.db")
}

func (c *Config) GitMotdFilePath() string {
	return path.Join(c.DataDir, "motd")
}

func (c *Config) Validate() error {
	if c.HostName == "" {
		return fmt.Errorf("knot hostname cannot be empty")
	}
	if c.OwnerDid == "" {
		return fmt.Errorf("knot owner did cannot be empty")
	}
	return nil
}

func Load(ctx context.Context, path string) (Config, error) {
	// NOTE: yaml.v3 package doesn't support "default" struct tag
	cfg := Config{
		Dev:               true,
		ListenHost:        "0.0.0.0",
		ListenPort:        "5555",
		DataDir:           "/home/git",
		RepoDir:           "/home/git",
		PlcUrl:            "https://plc.directory",
		JetstreamEndpoint: "wss://jetstream1.us-west.bsky.network/subscribe",
		AppviewEndpoint:   "https://tangled.org",
		GitUserName:       "Tangled",
		GitUserEmail:      "noreply@tangled.org",
	}
	// load config from env vars
	err := envconfig.Process(ctx, &cfg.OAuth)
	if err != nil {
		return cfg, err
	}

	// load config from toml config file
	bytes, err := os.ReadFile(path)
	if err != nil {
		return cfg, err
	}
	if err := yaml.Unmarshal(bytes, &cfg); err != nil {
		return cfg, err
	}

	// validate the config
	if err = cfg.Validate(); err != nil {
		return cfg, err
	}
	return cfg, nil
}