package config

import (
	"os"
	"strconv"
	"time"
)

// Getenv abstracts os.Getenv so tests can inject a fake environment.
type Getenv func(string) (string, bool)

// OSEnviron is the default Getenv backed by the real process environment.
func OSEnviron(key string) (string, bool) { return os.LookupEnv(key) }

// Env is every environment variable vault-tui recognises. Vault-native
// names keep their VAULT_ prefix for CLI parity; vault-tui-only settings use
// VAULT_TUI_. Kept as named constants (rather than inlined strings in
// resolve.go) so the set is easy to audit and document in one place.
const (
	EnvAddress            = "VAULT_ADDR"
	EnvNamespace          = "VAULT_NAMESPACE"
	EnvCACert             = "VAULT_CACERT"
	EnvCACertBytes        = "VAULT_CACERT_BYTES"
	EnvCAPath             = "VAULT_CAPATH"
	EnvClientCert         = "VAULT_CLIENT_CERT"
	EnvClientKey          = "VAULT_CLIENT_KEY"
	EnvTLSServerName      = "VAULT_TLS_SERVER_NAME"
	EnvSkipVerify         = "VAULT_SKIP_VERIFY"
	EnvClientTimeout      = "VAULT_CLIENT_TIMEOUT"
	EnvMaxRetries         = "VAULT_MAX_RETRIES"
	EnvSRVLookup          = "VAULT_SRV_LOOKUP"
	EnvDisableRedirects   = "VAULT_DISABLE_REDIRECTS"
	EnvHTTPProxy          = "VAULT_HTTP_PROXY"
	EnvProxyAddr          = "VAULT_PROXY_ADDR"
	EnvRateLimit          = "VAULT_RATE_LIMIT"
	EnvToken              = "VAULT_TOKEN"
	EnvConfigPathVaultCLI = "VAULT_CONFIG_PATH" // consumed by api/cliconfig, not by us directly

	EnvTUIConfig   = "VAULT_TUI_CONFIG"
	EnvTUIProfile  = "VAULT_TUI_PROFILE"
	EnvTUINoEnv    = "VAULT_TUI_NO_ENV"
	EnvTUIReadOnly = "VAULT_TUI_READ_ONLY"

	// EnvAuthParamPrefix + strings.ToUpper(Field.Name) is consulted by
	// internal/auth.Prefill alongside each Field's own EnvFallback list.
	EnvAuthParamPrefix = "VAULT_TUI_AUTH_"
)

func envBool(get Getenv, key string) (bool, bool) {
	v, ok := get(key)
	if !ok || v == "" {
		return false, false
	}
	b, err := strconv.ParseBool(v)
	if err != nil {
		return false, false
	}
	return b, true
}

func envDuration(get Getenv, key string) (time.Duration, bool) {
	v, ok := get(key)
	if !ok || v == "" {
		return 0, false
	}
	d, err := time.ParseDuration(v)
	if err != nil {
		if secs, serr := strconv.Atoi(v); serr == nil {
			return time.Duration(secs) * time.Second, true
		}
		return 0, false
	}
	return d, true
}

func envInt(get Getenv, key string) (int, bool) {
	v, ok := get(key)
	if !ok || v == "" {
		return 0, false
	}
	n, err := strconv.Atoi(v)
	if err != nil {
		return 0, false
	}
	return n, true
}