// tmctl is the TextMachine CLI (Фаза 0: translate один чанк + report).
package main

import (
	"bufio"
	"context"
	"flag"
	"fmt"
	"os"
	"os/signal"
	"path/filepath"
	"strings"
	"syscall"

	"textmachine/backend/internal/obs"
	"textmachine/backend/internal/pipeline"
)

func main() {
	if err := run(); err != nil {
		fmt.Fprintln(os.Stderr, "tmctl:", err)
		os.Exit(1)
	}
}

func run() error {
	if len(os.Args) < 2 {
		return fmt.Errorf("usage: tmctl <translate|report> --config book.yaml")
	}
	cmd, args := os.Args[1], os.Args[2:]

	fs := flag.NewFlagSet(cmd, flag.ExitOnError)
	cfgPath := fs.String("config", "", "path to book.yaml")
	if err := fs.Parse(args); err != nil {
		return err
	}
	if *cfgPath == "" {
		return fmt.Errorf("--config book.yaml is required")
	}

	loadDotEnv(filepath.Join(filepath.Dir(*cfgPath), ".env"))
	loadDotEnv(".env")

	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()
	ctx = obs.WithReqInfo(ctx, obs.ReqInfo{TraceID: obs.NewTraceID()})

	switch cmd {
	case "translate":
		return translate(ctx, *cfgPath)
	case "report":
		return report(*cfgPath)
	default:
		return fmt.Errorf("unknown command %q (want translate|report)", cmd)
	}
}

func translate(ctx context.Context, cfgPath string) error {
	r, err := pipeline.NewRunner(cfgPath, obs.NewLogger())
	if err != nil {
		return err
	}
	defer r.Close()

	res, err := r.TranslateOneChunk(ctx)
	if err != nil {
		return err
	}

	fmt.Println("=== ПЕРЕВОД ===")
	fmt.Println(res.FinalText)
	fmt.Println()
	fmt.Println("=== СТОИМОСТЬ ПО СТАДИЯМ ===")
	for _, st := range res.Stages {
		src := "call"
		if st.FromResume {
			src = "checkpoint"
		}
		fmt.Printf("%-8s %-22s %-10s $%.6f  in=%d (cached=%d, cache_write=%d) out=%d+%d  %dms  finish=%s\n",
			st.Stage, st.Model, src, st.CostUSD,
			st.Usage.PromptTokens, st.Usage.CachedTokens, st.Usage.CacheCreationTokens,
			st.Usage.CompletionTokens, st.Usage.ReasoningTokens, st.LatencyMS, st.FinishReason)
	}
	fmt.Printf("ИТОГО (этот запуск): $%.6f\n", res.TotalUSD)

	committed, reserved, err := r.Store.SpentUSD(res.BookID)
	if err != nil {
		return err
	}
	fmt.Printf("Ledger книги: committed=$%.6f reserved=$%.6f\n", committed, reserved)
	return nil
}

func report(cfgPath string) error {
	r, err := pipeline.NewRunner(cfgPath, obs.NewLogger())
	if err != nil {
		return err
	}
	defer r.Close()

	rows, err := r.Store.RequestLogRows(r.Book.BookID)
	if err != nil {
		return err
	}
	defer rows.Close()

	fmt.Printf("%-20s %-8s %-12s %-22s %8s %8s %8s %8s %8s %10s %8s %-8s %-5s %-3s\n",
		"ts", "stage", "role", "model", "prompt", "cached", "cwrite", "compl", "reason", "cost_usd", "ms", "finish", "tmhit", "ok")
	for rows.Next() {
		var ts, stage, role, model, finish string
		var prompt, cached, cwrite, compl, reason, latency, tmhit, ok int
		var cost float64
		if err := rows.Scan(&ts, &stage, &role, &model, &prompt, &cached, &cwrite, &compl, &reason, &cost, &latency, &finish, &tmhit, &ok); err != nil {
			return err
		}
		fmt.Printf("%-20s %-8s %-12s %-22s %8d %8d %8d %8d %8d %10.6f %8d %-8s %-5d %-3d\n",
			ts, stage, role, model, prompt, cached, cwrite, compl, reason, cost, latency, finish, tmhit, ok)
	}
	if err := rows.Err(); err != nil {
		return err
	}

	committed, reserved, err := r.Store.SpentUSD(r.Book.BookID)
	if err != nil {
		return err
	}
	fmt.Printf("\nLedger книги: committed=$%.6f reserved=$%.6f\n", committed, reserved)
	return nil
}

// loadDotEnv reads KEY=VALUE lines into the environment without overriding
// already-set variables. Ключи — из backend/.env (gitignored); секреты никогда
// не попадают в конфиги/репо.
func loadDotEnv(path string) {
	f, err := os.Open(path)
	if err != nil {
		return
	}
	defer f.Close()
	sc := bufio.NewScanner(f)
	for sc.Scan() {
		line := strings.TrimSpace(sc.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		k, v, ok := strings.Cut(line, "=")
		if !ok {
			continue
		}
		k, v = strings.TrimSpace(k), strings.Trim(strings.TrimSpace(v), `"'`)
		if os.Getenv(k) == "" {
			os.Setenv(k, v)
		}
	}
}