package httpapi

import (
	"context"
	"errors"
	"net/http"

	"github.com/vasyansk/imap-copier/internal/crypto"
	"github.com/vasyansk/imap-copier/internal/csvimport"
	"github.com/vasyansk/imap-copier/internal/orchestrator"
	"github.com/vasyansk/imap-copier/internal/store"
)

func (s *Server) handleImportCSV(w http.ResponseWriter, r *http.Request) {
	taskID, err := pathID(r, "id")
	if err != nil {
		http.Error(w, "bad id", http.StatusBadRequest)
		return
	}
	file, _, err := r.FormFile("file")
	if err != nil {
		http.Error(w, "file required", http.StatusBadRequest)
		return
	}
	defer file.Close()
	rows, err := csvimport.Parse(file)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	for _, row := range rows {
		srcEnc, err := crypto.Encrypt(s.cfg.EncKey, []byte(row.SrcPass))
		if err != nil {
			http.Error(w, "encrypt", http.StatusInternalServerError)
			return
		}
		dstEnc, err := crypto.Encrypt(s.cfg.EncKey, []byte(row.DstPass))
		if err != nil {
			http.Error(w, "encrypt", http.StatusInternalServerError)
			return
		}
		if _, err := s.store.CreateAccount(r.Context(), store.Account{
			TaskID: taskID, SrcLogin: row.SrcLogin, SrcPassEnc: srcEnc,
			DstLogin: row.DstLogin, DstPassEnc: dstEnc,
		}); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
	writeJSON(w, http.StatusCreated, map[string]int{"imported": len(rows)})
}

func (s *Server) handleTestAccounts(w http.ResponseWriter, r *http.Request) {
	taskID, err := pathID(r, "id")
	if err != nil {
		http.Error(w, "bad id", http.StatusBadRequest)
		return
	}
	// Detach from the request context: the request context is cancelled when
	// this handler returns, which would otherwise kill the background test run.
	ctx := context.WithoutCancel(r.Context())
	go s.orch.TestAccounts(ctx, taskID) // прогресс через WS
	w.WriteHeader(http.StatusAccepted)
}

func (s *Server) handleRun(w http.ResponseWriter, r *http.Request) {
	taskID, err := pathID(r, "id")
	if err != nil {
		http.Error(w, "bad id", http.StatusBadRequest)
		return
	}
	runID, err := s.orch.Run(r.Context(), taskID)
	if errors.Is(err, orchestrator.ErrNotTested) {
		http.Error(w, "accounts must pass connection tests first", http.StatusConflict)
		return
	}
	if errors.Is(err, orchestrator.ErrAlreadyRunning) {
		http.Error(w, "task is already running", http.StatusConflict)
		return
	}
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	writeJSON(w, http.StatusAccepted, map[string]int64{"run_id": runID})
}