package main

import (
	"fmt"
	"regexp"
)

type startupPhase string

const (
	phaseConfig         startupPhase = "config"
	phaseSingleton      startupPhase = "singleton"
	phasePort           startupPhase = "port"
	phaseLogger         startupPhase = "logger"
	phaseDatabase       startupPhase = "database"
	phaseMigration      startupPhase = "migration"
	phaseAdapter        startupPhase = "adapter"
	phaseStaticResource startupPhase = "static"
	phaseServer         startupPhase = "server"
	phaseTray           startupPhase = "tray"
)

type startupError struct {
	phase   startupPhase
	message string
	cause   error
}

func newStartupError(phase startupPhase, message string, cause error) *startupError {
	return &startupError{
		phase:   phase,
		message: redactSensitive(message),
		cause:   cause,
	}
}

func (e *startupError) Error() string {
	if e == nil {
		return ""
	}
	if e.cause == nil {
		return fmt.Sprintf("%s: %s", e.phase, e.message)
	}
	return fmt.Sprintf("%s: %s: %s", e.phase, e.message, redactSensitive(e.cause.Error()))
}

func (e *startupError) Unwrap() error {
	if e == nil {
		return nil
	}
	return e.cause
}

func (e *startupError) Phase() string {
	if e == nil {
		return ""
	}
	return string(e.phase)
}

func (e *startupError) UserMessage() string {
	if e == nil {
		return ""
	}
	return redactSensitive(e.message)
}

var sensitiveReplacers = []struct {
	pattern     *regexp.Regexp
	replacement string
}{
	{regexp.MustCompile(`(?i)(password\s*[:=]\s*)[^\s,;&]+`), `${1}<redacted>`},
	{regexp.MustCompile(`(?i)(api[_-]?key\s*[:=]\s*)[^\s,;&]+`), `${1}<redacted>`},
	{regexp.MustCompile(`(?i)(secret\s*[:=]\s*)[^\s,;&]+`), `${1}<redacted>`},
	{regexp.MustCompile(`([^\s:/]+):([^\s@]+)@tcp\(`), `${1}:<redacted>@tcp(`},
	{regexp.MustCompile(`(://[^\s:/]+):([^\s@]+)@`), `${1}:<redacted>@`},
}

func redactSensitive(s string) string {
	for _, replacer := range sensitiveReplacers {
		s = replacer.pattern.ReplaceAllString(s, replacer.replacement)
	}
	return s
}

func startupTitle() string {
	return appName + " 启动失败"
}

func startupServerErrorMessage() string {
	return "后端服务启动失败\n\n请检查端口占用、网络权限或查看日志获取更多信息"
}

func startupInternalErrorMessage() string {
	return "应用初始化失败\n\n请查看日志或重新安装应用"
}