package zset

import (
	"context"

	"github.com/gogf/gf/v2/errors/gerror"
)

// ProducerState is a small internal read view, not a new Run wire format.
// ActiveCount includes inflight; never add InflightCount to capacity usage.
type ProducerState struct {
	Status       string
	ProducerDone bool
	CurrentRound int
	ActiveCount  int64
	Blocked      bool
}

func (s *Store) ReadProducerState(ctx context.Context, runID, chanKey string) (ProducerState, error) {
	key, err := s.RunMetaKey(runID)
	if err != nil {
		return ProducerState{}, err
	}
	result, err := s.redis.Do(ctx, "HMGET", key, "runId", "status", "producerDone", "currentRound", "activeCount", "blocked:"+chanKey)
	if err != nil {
		return ProducerState{}, gerror.Wrap(err, "read producer state")
	}
	values := result.Strings()
	if len(values) != 6 || values[0] == "" {
		return ProducerState{}, gerror.Wrapf(ErrRunNotFound, "run %q", runID)
	}
	state := ProducerState{Status: values[1], ProducerDone: parseBool(values[2]), CurrentRound: parseInt(values[3]), ActiveCount: parseInt64(values[4]), Blocked: parseBool(values[5])}
	if state.CurrentRound <= 0 || state.ActiveCount < 0 {
		return ProducerState{}, gerror.New("invalid producer run counters")
	}
	return state, nil
}

// ExistingRunTasks uses one bounded HMGET for a producer page. All task states
// (queued, leased, waiting, success and failed) count as already admitted.
func (s *Store) ExistingRunTasks(ctx context.Context, runID string, tasks []Task) ([]bool, error) {
	if len(tasks) == 0 {
		return nil, nil
	}
	key, err := s.TaskStateKey(runID)
	if err != nil {
		return nil, err
	}
	args := make([]any, 1, len(tasks)+1)
	args[0] = key
	for _, task := range tasks {
		if task.TaskID == "" || task.RunID != runID {
			return nil, gerror.New("invalid task identity in producer state read")
		}
		args = append(args, task.TaskID)
	}
	result, err := s.redis.Do(ctx, "HMGET", args...)
	if err != nil {
		return nil, gerror.Wrap(err, "read existing run tasks")
	}
	values := result.Strings()
	if len(values) != len(tasks) {
		return nil, gerror.New("incomplete HMGET task state response")
	}
	exists := make([]bool, len(tasks))
	for i, value := range values {
		exists[i] = value != ""
	}
	return exists, nil
}