package main

import (
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"os"
	"strings"
	"time"

	"chat-agent-system/internal/artifactvault"

	"github.com/jackc/pgx/v5/pgxpool"
)

func main() {
	if len(os.Args) < 2 {
		fmt.Fprintln(os.Stderr, "usage: artifact-vault <backfill|inventory|verify|recover-plan|recover-apply|gc-preflight|destroy> [flags]")
		os.Exit(2)
	}
	cmd := os.Args[1]
	os.Args = append([]string{os.Args[0]}, os.Args[2:]...)
	switch cmd {
	case "backfill":
		runBackfill()
	case "inventory":
		runInventory()
	case "verify":
		runVerify()
	case "recover-plan":
		runRecoverPlan()
	case "recover-apply":
		runRecoverApply()
	case "gc-preflight":
		runGCPreflight()
	case "destroy":
		runDestroy()
	default:
		fmt.Fprintln(os.Stderr, "unknown command:", cmd)
		os.Exit(2)
	}
}

func runBackfill() {
	dsn := flag.String("dsn", os.Getenv("APP_DB_DSN"), "postgres DSN")
	env := flag.String("env", "dev", "environment")
	flag.Parse()
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
	defer cancel()
	pool, err := mustPool(ctx, *dsn)
	if err != nil {
		fatal(err)
	}
	defer pool.Close()
	rows, err := artifactvault.EnumerateTerminals(ctx, pool, *env)
	if err != nil {
		fatal(err)
	}
	ex, err := artifactvault.LoadExclusions(ctx, pool)
	if err != nil {
		fatal(err)
	}
	reg := artifactvault.NewPGRegistry(pool)
	rep, err := artifactvault.Backfill(ctx, reg, rows, ex)
	if err != nil {
		fatal(err)
	}
	writeJSON(rep)
}

func runInventory() {
	root := flag.String("root", os.Getenv("VAULT_STATE_ROOT"), "vault root")
	ident := flag.String("identity", os.Getenv("VAULT_STORAGE_IDENTITY"), "vault identity")
	flag.Parse()
	if *root == "" || *ident == "" {
		fatal(fmt.Errorf("root and identity required"))
	}
	st, err := artifactvault.NewFilesystemStore(*root, *ident, []byte(nz(os.Getenv("VAULT_MASTER_KEY"), "0123456789abcdef0123456789abcdef")))
	if err != nil {
		fatal(err)
	}
	writeJSON(map[string]any{"identity_ok": st.StorageIdentity != "", "root_exists": true, "identity": "omitted"})
}

func runVerify() {
	dsn := flag.String("dsn", os.Getenv("APP_DB_DSN"), "postgres DSN")
	flag.Parse()
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancel()
	pool, err := mustPool(ctx, *dsn)
	if err != nil {
		fatal(err)
	}
	defer pool.Close()
	reg := artifactvault.NewPGRegistry(pool)
	cov := reg.Coverage(ctx)
	writeJSON(map[string]any{"coverage": cov, "pass": artifactvault.CoveragePASS(cov)})
}

func runRecoverPlan() {
	target := flag.String("target-dsn", "", "scratch DSN")
	ident := flag.String("target-identity", "", "scratch identity")
	mode := flag.String("mode", string(artifactvault.RecoverAsCollection), "recover mode")
	flag.Parse()
	plan := artifactvault.RecoverPlan{
		Mode: artifactvault.RecoverMode(*mode), TargetIdentity: *target, SourceIdentity: "vault",
		PlanHash: "plan-" + time.Now().UTC().Format("20060102"), HasAdmin: true, ScratchOnly: true,
	}
	if err := artifactvault.EvaluateRecoverPlan(plan, false); err != nil {
		fatal(err)
	}
	if err := artifactvault.ValidateRecoverTarget(*target, *ident); err != nil {
		fatal(err)
	}
	writeJSON(plan)
}

func runRecoverApply() {
	sourceRoot := flag.String("source-root", os.Getenv("VAULT_STATE_ROOT"), "vault root")
	destDir := flag.String("dest-dir", "", "scratch collection directory")
	target := flag.String("target-dsn", "", "scratch DSN")
	ident := flag.String("target-identity", "", "scratch identity")
	sourceIdent := flag.String("identity", os.Getenv("VAULT_STORAGE_IDENTITY"), "source vault identity")
	confirm := flag.String("confirm", "", "must equal plan hash")
	flag.Parse()
	if err := artifactvault.ValidateRecoverTarget(*target, *ident); err != nil {
		fatal(err)
	}
	if *confirm == "" {
		fatal(fmt.Errorf("confirm plan hash required"))
	}
	if *sourceRoot == "" || *sourceIdent == "" {
		fatal(fmt.Errorf("source-root and identity required"))
	}
	plan := artifactvault.RecoverPlan{
		Mode: artifactvault.RecoverAsCollection, TargetIdentity: *target, SourceIdentity: *ident,
		PlanHash: *confirm, HasAdmin: true, ScratchOnly: true,
	}
	store, err := artifactvault.NewFilesystemStore(*sourceRoot, *sourceIdent, []byte(nz(os.Getenv("VAULT_MASTER_KEY"), "0123456789abcdef0123456789abcdef")))
	if err != nil {
		fatal(err)
	}
	arts, payloads, err := store.LoadCommittedArtifacts()
	if err != nil {
		fatal(err)
	}
	denied := map[string]bool{}
	for _, art := range arts {
		if art.PublicationStatus == artifactvault.StatusTombstoned || store.HasTombstone(art.UUID) {
			denied[art.UUID] = true
		}
	}
	out, err := artifactvault.ApplyRecoverAsCollection(plan, *destDir, arts, payloads, denied)
	if err != nil {
		fatal(err)
	}
	writeJSON(out)
}

func runDestroy() {
	dsn := flag.String("dsn", os.Getenv("APP_DB_DSN"), "postgres DSN")
	backupOK := flag.Bool("backup-ok", false, "complementary backup PASS")
	corpusOK := flag.Bool("corpus-ok", false, "migration corpus PASS")
	confirm := flag.String("confirm", "", "must equal DESTROY")
	flag.Parse()
	if *confirm != "DESTROY" {
		fatal(fmt.Errorf("destroy requires --confirm=DESTROY"))
	}
	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
	defer cancel()
	pool, err := mustPool(ctx, *dsn)
	if err != nil {
		fatal(err)
	}
	defer pool.Close()
	reg := artifactvault.NewPGRegistry(pool)
	if err := artifactvault.PreflightDestroy(reg.Coverage(ctx), *backupOK, *corpusOK, true); err != nil {
		fatal(err)
	}
	writeJSON(map[string]string{"status": "preflight-pass", "note": "dataset wipe is operator-owned after complementary PASS"})
}

func runGCPreflight() {
	dsn := flag.String("dsn", os.Getenv("APP_DB_DSN"), "postgres DSN")
	backupOK := flag.Bool("backup-ok", false, "complementary backup PASS")
	corpusOK := flag.Bool("corpus-ok", false, "migration corpus PASS")
	flag.Parse()
	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
	defer cancel()
	pool, err := mustPool(ctx, *dsn)
	if err != nil {
		fatal(err)
	}
	defer pool.Close()
	reg := artifactvault.NewPGRegistry(pool)
	if err := artifactvault.PreflightDestroy(reg.Coverage(ctx), *backupOK, *corpusOK, true); err != nil {
		fatal(err)
	}
	writeJSON(map[string]string{"status": "pass"})
}

func mustPool(ctx context.Context, dsn string) (*pgxpool.Pool, error) {
	if dsn == "" {
		return nil, fmt.Errorf("dsn required")
	}
	return pgxpool.New(ctx, dsn)
}

func writeJSON(v any) {
	enc := json.NewEncoder(os.Stdout)
	enc.SetIndent("", "  ")
	_ = enc.Encode(v)
}

func fatal(err error) {
	fmt.Fprintln(os.Stderr, err)
	os.Exit(1)
}

func nz(v, def string) string {
	if strings.TrimSpace(v) == "" {
		return def
	}
	return v
}