package config

import (
	"os"
	"strconv"
	"strings"
)

// Config 运行配置（环境变量优先，与 Java EBA_* / analysis.* 对齐）。
type Config struct {
	Port int

	// MySQL：优先 EBA_DB_DSN；否则用 HOST/PORT/NAME/USER/PASSWORD 拼，或解析 JDBC URL。
	DBDSN string

	AnalysisMode string // live | demo
	AuthEnabled  bool
	DemoEnabled  bool
	LivePollMS   int
	DemoTickMS   int

	DeerFlowBaseURL           string
	DeerFlowUser              string
	DeerFlowPassword          string
	DeerFlowCoordinator       string
	DeerFlowStreamIdleTimeout int // 毫秒
}

// Load 从环境变量加载；缺省贴近本机联调。
func Load() Config {
	c := Config{
		Port:                      envInt("SERVER_PORT", 18097),
		AnalysisMode:              env("ANALYSIS_MODE", "live"),
		AuthEnabled:               envBool("ANALYSIS_AUTH_ENABLED", false),
		DemoEnabled:               envBool("EBA_WORKER_DEMO_ENABLED", false),
		LivePollMS:                envInt("EBA_WORKER_LIVE_POLL_MS", 1000),
		DemoTickMS:                envInt("EBA_WORKER_TICK_MS", 400),
		DeerFlowBaseURL:           strings.TrimRight(env("EBA_DF_BASE_URL", "http://127.0.0.1:8001"), "/"),
		DeerFlowUser:              env("EBA_DF_USER", "admin"),
		DeerFlowPassword:          env("EBA_DF_PASSWORD", "123ewq"),
		DeerFlowCoordinator:       env("EBA_DF_COORDINATOR", "roundtable-coordinator"),
		DeerFlowStreamIdleTimeout: envInt("EBA_DF_STREAM_IDLE_TIMEOUT_MS", 180000),
	}
	c.DBDSN = resolveDSN()
	// live 默认关掉 demo；显式 ANALYSIS_MODE=demo 时打开假进度
	if c.AnalysisMode == "demo" {
		c.DemoEnabled = true
	}
	if c.AnalysisMode == "live" && !envExplicit("EBA_WORKER_DEMO_ENABLED") {
		c.DemoEnabled = false
	}
	return c
}

func resolveDSN() string {
	if d := strings.TrimSpace(os.Getenv("EBA_DB_DSN")); d != "" {
		return ensureMultiStatements(d)
	}
	user := env("EBA_DB_USER", "eba")
	pass := env("EBA_DB_PASSWORD", "eba_local_dev")
	jdbc := strings.TrimSpace(os.Getenv("EBA_DB_URL"))
	if jdbc != "" {
		if dsn, ok := jdbcToDSN(jdbc, user, pass); ok {
			return dsn
		}
	}
	host := env("EBA_DB_HOST", "127.0.0.1")
	port := env("EBA_DB_PORT", "3306")
	name := env("EBA_DB_NAME", "eightbf_analysis")
	return user + ":" + pass + "@tcp(" + host + ":" + port + ")/" + name +
		"?parseTime=true&loc=Asia%2FShanghai&charset=utf8mb4&multiStatements=true"
}

// jdbcToDSN 把 Java 的 jdbc:mysql://host:port/db?... 转成 Go driver DSN。
func jdbcToDSN(jdbc, user, pass string) (string, bool) {
	s := strings.TrimPrefix(jdbc, "jdbc:mysql://")
	if s == jdbc {
		return "", false
	}
	hostPath := s
	query := ""
	if i := strings.Index(s, "?"); i >= 0 {
		hostPath = s[:i]
		query = s[i+1:]
	}
	host := hostPath
	db := "eightbf_analysis"
	if i := strings.Index(hostPath, "/"); i >= 0 {
		host = hostPath[:i]
		db = hostPath[i+1:]
	}
	params := "parseTime=true&loc=Asia%2FShanghai&charset=utf8mb4&multiStatements=true"
	_ = query // Java JDBC 专用参数不照搬
	return user + ":" + pass + "@tcp(" + host + ")/" + db + "?" + params, true
}

func ensureMultiStatements(dsn string) string {
	if strings.Contains(dsn, "multiStatements=") {
		return dsn
	}
	if strings.Contains(dsn, "?") {
		return dsn + "&multiStatements=true"
	}
	return dsn + "?multiStatements=true"
}

func env(k, def string) string {
	if v := strings.TrimSpace(os.Getenv(k)); v != "" {
		return v
	}
	return def
}

func envExplicit(k string) bool {
	_, ok := os.LookupEnv(k)
	return ok
}

func envBool(k string, def bool) bool {
	v := strings.TrimSpace(os.Getenv(k))
	if v == "" {
		return def
	}
	switch strings.ToLower(v) {
	case "1", "true", "yes", "on":
		return true
	case "0", "false", "no", "off":
		return false
	default:
		return def
	}
}

func envInt(k string, def int) int {
	v := strings.TrimSpace(os.Getenv(k))
	if v == "" {
		return def
	}
	n, err := strconv.Atoi(v)
	if err != nil {
		return def
	}
	return n
}