package main

// launch_run.go：启动台启停运行态（starting/running/failed）与本地进程日志。
// launch_logs 仅存本机 SQLite，不参与云同步。

import (
	"bufio"
	"io"
	"strings"
	"sync"
	"time"
)

type launchRunState struct {
	mu        sync.Mutex
	Status    string // starting | running | failed | stopped
	Error     string
	LastLog   string
	StartedAt time.Time
}

var (
	lpRunMu sync.Mutex
	lpRuns  = map[int64]*launchRunState{}
)

func lpState(id int64) *launchRunState {
	lpRunMu.Lock()
	defer lpRunMu.Unlock()
	st, ok := lpRuns[id]
	if !ok {
		st = &launchRunState{Status: "stopped"}
		lpRuns[id] = st
	}
	return st
}

func (st *launchRunState) snapshot() (status, errMsg, lastLog string) {
	st.mu.Lock()
	defer st.mu.Unlock()
	return st.Status, st.Error, st.LastLog
}

func (st *launchRunState) set(status, errMsg, lastLog string) {
	st.mu.Lock()
	defer st.mu.Unlock()
	if status != "" {
		st.Status = status
	}
	if errMsg != "" || status == "running" || status == "starting" {
		st.Error = errMsg
	}
	if lastLog != "" {
		st.LastLog = lastLog
	}
	if status == "starting" {
		st.StartedAt = time.Now()
		st.Error = ""
	}
}

func (s *Store) appendLaunchLog(appID int64, level, line string) {
	line = strings.TrimRight(line, "\r\n")
	if strings.TrimSpace(line) == "" {
		return
	}
	if len(line) > 4000 {
		line = line[:4000] + "…"
	}
	if level == "" {
		level = "info"
	}
	_, _ = s.db.Exec(`INSERT INTO launch_logs(app_id,level,line,created_at) VALUES(?,?,?,?)`,
		appID, level, line, nowRFC())
	// 每个应用最多保留 800 行，避免无限膨胀。
	_, _ = s.db.Exec(`DELETE FROM launch_logs WHERE app_id=? AND id NOT IN (
		SELECT id FROM launch_logs WHERE app_id=? ORDER BY id DESC LIMIT 800)`, appID, appID)
}

func (s *Store) ListLaunchLogs(appID int64, limit int) ([]LaunchLogLine, error) {
	if limit <= 0 || limit > 500 {
		limit = 200
	}
	rows, e := s.db.Query(`SELECT id,app_id,level,line,created_at FROM launch_logs WHERE app_id=? ORDER BY id DESC LIMIT ?`, appID, limit)
	if e != nil {
		return nil, e
	}
	defer rows.Close()
	out := []LaunchLogLine{}
	for rows.Next() {
		var x LaunchLogLine
		if e = rows.Scan(&x.ID, &x.AppID, &x.Level, &x.Line, &x.CreatedAt); e != nil {
			return nil, e
		}
		out = append(out, x)
	}
	// 按时间正序返回，便于控制台阅读。
	for i, j := 0, len(out)-1; i < j; i, j = i+1, j-1 {
		out[i], out[j] = out[j], out[i]
	}
	return out, rows.Err()
}

func (s *Store) ClearLaunchLogs(appID int64) error {
	_, e := s.db.Exec(`DELETE FROM launch_logs WHERE app_id=?`, appID)
	return e
}

func (a *App) ListLaunchLogs(appID int64, limit int) ([]LaunchLogLine, error) {
	if e := a.ready(); e != nil {
		return nil, e
	}
	return a.store.ListLaunchLogs(appID, limit)
}

func (a *App) ClearLaunchLogs(appID int64) error {
	if e := a.ready(); e != nil {
		return e
	}
	return a.store.ClearLaunchLogs(appID)
}

func (a *App) writeLaunchLog(appID int64, level, line string) {
	a.store.appendLaunchLog(appID, level, line)
	st := lpState(appID)
	st.set("", "", line)
	a.emit("launchpad:log", map[string]any{"appId": appID, "level": level, "line": line})
}

// pipeLaunchOutput 把子进程 stdout/stderr 写入本地日志。
func (a *App) pipeLaunchOutput(appID int64, r io.Reader, fallbackLevel string) {
	sc := bufio.NewScanner(r)
	buf := make([]byte, 0, 64*1024)
	sc.Buffer(buf, 1024*1024)
	for sc.Scan() {
		line := sc.Text()
		level := launchLogLevelFromLine(line)
		if level == "info" && fallbackLevel == "error" {
			level = "error"
		}
		a.writeLaunchLog(appID, level, line)
	}
}

func launchLogLevelFromLine(line string) string {
	l := strings.ToLower(line)
	switch {
	case strings.Contains(l, "error"), strings.Contains(l, "fatal"), strings.Contains(l, "panic"), strings.Contains(l, "failed"):
		return "error"
	case strings.Contains(l, "warn"):
		return "warning"
	default:
		return "info"
	}
}