package sourceagent

import (
	"context"
	"errors"
	"fmt"
	"strings"
	"time"

	"github.com/local/glpi-neural-brain/internal/articlequality"
)

const ComputeKindArticleQuality = "article_quality"

type ArticleQualityComputeRequest struct {
	SchemaVersion int                    `json:"schema_version"`
	JobID         string                 `json:"job_id"`
	Kind          string                 `json:"kind"`
	CreatedAt     time.Time              `json:"created_at"`
	Payload       articlequality.Request `json:"payload"`
}
type ArticleQualityComputeResult struct {
	SchemaVersion int                   `json:"schema_version"`
	JobID         string                `json:"job_id"`
	Kind          string                `json:"kind"`
	AgentID       string                `json:"agent_id,omitempty"`
	DurationMS    int64                 `json:"duration_ms"`
	Quality       articlequality.Result `json:"quality"`
	Error         string                `json:"error,omitempty"`
}
type articleQualityJobState struct {
	request           ArticleQualityComputeRequest
	status, claimedBy string
	leaseUntil        time.Time
	done              chan ArticleQualityComputeResult
}

func (s *Store) SubmitArticleQualityJob(ctx context.Context, request ArticleQualityComputeRequest) (ArticleQualityComputeResult, error) {
	if s == nil {
		return ArticleQualityComputeResult{}, errors.New("source agent store unavailable")
	}
	if strings.TrimSpace(request.JobID) == "" {
		request.JobID = randomID("article-quality")
	}
	request.SchemaVersion = SchemaVersion
	request.Kind = ComputeKindArticleQuality
	if request.CreatedAt.IsZero() {
		request.CreatedAt = time.Now().UTC()
	}
	request.Payload.JobID = request.JobID
	st := &articleQualityJobState{request: request, status: "queued", done: make(chan ArticleQualityComputeResult, 1)}
	s.articleQualityMu.Lock()
	if s.articleQualityJobs == nil {
		s.articleQualityJobs = map[string]*articleQualityJobState{}
	}
	if _, ok := s.articleQualityJobs[request.JobID]; ok {
		s.articleQualityMu.Unlock()
		return ArticleQualityComputeResult{}, fmt.Errorf("article quality compute job %s already exists", request.JobID)
	}
	s.articleQualityJobs[request.JobID] = st
	s.articleQualityOrder = append(s.articleQualityOrder, request.JobID)
	s.articleQualityMu.Unlock()
	select {
	case r := <-st.done:
		if r.Error != "" {
			return r, errors.New(r.Error)
		}
		return r, nil
	case <-ctx.Done():
		s.articleQualityMu.Lock()
		delete(s.articleQualityJobs, request.JobID)
		s.removeArticleQualityOrderLocked(request.JobID)
		s.articleQualityMu.Unlock()
		return ArticleQualityComputeResult{}, ctx.Err()
	}
}
func (s *Store) ClaimArticleQualityJob(agentID string, lease time.Duration) (ArticleQualityComputeRequest, bool) {
	if s == nil {
		return ArticleQualityComputeRequest{}, false
	}
	if lease < 30*time.Second {
		lease = 30 * time.Second
	}
	now := time.Now().UTC()
	s.articleQualityMu.Lock()
	defer s.articleQualityMu.Unlock()
	for _, id := range s.articleQualityOrder {
		st := s.articleQualityJobs[id]
		if st == nil {
			continue
		}
		if st.status == "claimed" && now.Before(st.leaseUntil) {
			continue
		}
		if st.status != "queued" && st.status != "claimed" {
			continue
		}
		st.status = "claimed"
		st.claimedBy = strings.TrimSpace(agentID)
		st.leaseUntil = now.Add(lease)
		return st.request, true
	}
	return ArticleQualityComputeRequest{}, false
}
func (s *Store) CompleteArticleQualityJob(agentID string, result ArticleQualityComputeResult) error {
	if s == nil {
		return errors.New("source agent store unavailable")
	}
	if strings.TrimSpace(result.JobID) == "" {
		return errors.New("article quality result job_id required")
	}
	s.articleQualityMu.Lock()
	st := s.articleQualityJobs[result.JobID]
	if st == nil {
		s.articleQualityMu.Unlock()
		return errors.New("article quality compute job not found or no longer active")
	}
	if st.status != "claimed" || strings.TrimSpace(st.claimedBy) == "" {
		s.articleQualityMu.Unlock()
		return errors.New("article quality compute job has not been claimed")
	}
	if strings.TrimSpace(agentID) != st.claimedBy {
		s.articleQualityMu.Unlock()
		return errors.New("article quality compute job is claimed by another agent")
	}
	if result.Kind == "" {
		result.Kind = ComputeKindArticleQuality
	}
	if result.Kind != ComputeKindArticleQuality {
		s.articleQualityMu.Unlock()
		return errors.New("unsupported article quality result kind")
	}
	result.SchemaVersion = SchemaVersion
	result.AgentID = strings.TrimSpace(agentID)
	delete(s.articleQualityJobs, result.JobID)
	s.removeArticleQualityOrderLocked(result.JobID)
	s.articleQualityMu.Unlock()
	select {
	case st.done <- result:
	default:
	}
	return nil
}
func (s *Store) removeArticleQualityOrderLocked(id string) {
	for i, v := range s.articleQualityOrder {
		if v == id {
			s.articleQualityOrder = append(s.articleQualityOrder[:i], s.articleQualityOrder[i+1:]...)
			return
		}
	}
}
func ExecuteArticleQualityJob(request ArticleQualityComputeRequest) ArticleQualityComputeResult {
	started := time.Now()
	r := ArticleQualityComputeResult{SchemaVersion: SchemaVersion, JobID: request.JobID, Kind: ComputeKindArticleQuality}
	r.Quality = articlequality.Evaluate(request.Payload)
	r.DurationMS = time.Since(started).Milliseconds()
	return r
}