// Package api provides REST API handlers for Spaxel feedback.
package api

import (
	"encoding/json"
	"log"
	"net/http"
	"strconv"
	"time"

	"github.com/go-chi/chi/v5"
	"github.com/spaxel/mothership/internal/diagnostics"
	"github.com/spaxel/mothership/internal/explainability"
)

// FeedbackRequest represents a feedback submission from the timeline.
type FeedbackRequest struct {
	Type     string `json:"type"`     // "correct" or "incorrect"
	EventID  int64  `json:"event_id"` // Optional: event ID being rated
	BlobID   int    `json:"blob_id"`  // Optional: blob ID being rated
	Position *struct {
		X float64 `json:"x"`
		Y float64 `json:"y"`
		Z float64 `json:"z"`
	} `json:"position,omitempty"` // For "missed" feedback
}

// FeedbackHandler handles simple feedback submissions from the UI.
type FeedbackHandler struct {
	eventsHandler       *EventsHandler
	learningHandler     any // Learning handler with ProcessFeedback method
	explainabilityHandler *explainability.Handler
	diagnosticEngine    *diagnostics.DiagnosticEngine
}

// NewFeedbackHandler creates a new feedback handler.
func NewFeedbackHandler(eventsHandler *EventsHandler) *FeedbackHandler {
	return &FeedbackHandler{
		eventsHandler: eventsHandler,
	}
}

// SetLearningHandler sets the learning handler for feedback processing.
func (h *FeedbackHandler) SetLearningHandler(learningHandler any) {
	h.learningHandler = learningHandler
}

// SetExplainabilityHandler sets the explainability handler.
func (h *FeedbackHandler) SetExplainabilityHandler(eh *explainability.Handler) {
	h.explainabilityHandler = eh
}

// SetDiagnosticEngine sets the diagnostic engine for link health analysis.
func (h *FeedbackHandler) SetDiagnosticEngine(de *diagnostics.DiagnosticEngine) {
	h.diagnosticEngine = de
}

// getExplainabilityForBlob retrieves the explainability snapshot for a blob.
// This is a helper method to avoid circular dependencies.
func (h *FeedbackHandler) getExplainabilityForBlob(blobID int, timestamp int64) *explainability.BlobExplanation {
	if h.explainabilityHandler == nil {
		return nil
	}

	// The explainability handler has its own mutex, so we can call its method directly
	// We need to access the blobHistory map which is not exported, so we'll use a workaround
	// by creating a minimal HTTP request to the internal handler

	// For now, we'll access the handler's internal state through a public method
	// In production, this would be done through a proper interface
	return h.explainabilityHandler.GetExplanationForBlob(blobID, timestamp)
}

// RegisterRoutes registers feedback endpoints.
func (h *FeedbackHandler) RegisterRoutes(r chi.Router) {
	r.Post("/api/feedback", h.handleSubmitFeedback)
}

// handleSubmitFeedback handles POST /api/feedback
func (h *FeedbackHandler) handleSubmitFeedback(w http.ResponseWriter, r *http.Request) {
	var req FeedbackRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSONError(w, http.StatusBadRequest, "invalid request body")
		return
	}

	// Validate feedback type
	if req.Type != "correct" && req.Type != "incorrect" && req.Type != "missed" {
		writeJSONError(w, http.StatusBadRequest, "invalid feedback type: must be 'correct', 'incorrect', or 'missed'")
		return
	}

	// Get event details for logging
	var zone, person string
	var detailJSON string

	if req.EventID > 0 {
		// Look up event by ID
		// This would require a DB query - for now, we'll just log the ID
		log.Printf("[INFO] Feedback for event %d: type=%s blob_id=%d", req.EventID, req.Type, req.BlobID)
	} else {
		log.Printf("[INFO] Feedback without event: type=%s blob_id=%d", req.Type, req.BlobID)
	}

	// Create detail JSON for the event
	details := make(map[string]interface{})
	if req.Position != nil {
		details["position"] = req.Position
	}

	detailBytes, _ := json.Marshal(details)
	detailJSON = string(detailBytes)

	// If this is feedback for a specific event, we could update the event's detail_json
	// to include the feedback. For now, we'll just log a new event.
	if req.Type == "incorrect" && req.EventID > 0 {
		// Log a "corrected" event to indicate the original was marked incorrect
		if h.eventsHandler != nil {
			_ = h.eventsHandler.LogEvent("feedback_corrected", time.Now(), zone, person, req.BlobID,
				`{"original_event_id":`+strconv.FormatInt(req.EventID, 10)+`,"feedback":"incorrect"}`, "info")
		}
	} else if req.Type == "correct" && req.EventID > 0 {
		// Log a positive feedback event
		if h.eventsHandler != nil {
			_ = h.eventsHandler.LogEvent("feedback_confirmed", time.Now(), zone, person, req.BlobID,
				`{"original_event_id":`+strconv.FormatInt(req.EventID, 10)+`,"feedback":"correct"}`, "info")
		}
	} else if req.Type == "missed" && req.Position != nil {
		// Log a missed detection
		if h.eventsHandler != nil {
			_ = h.eventsHandler.LogEvent("missed_detection", time.Now(), zone, person, req.BlobID,
				detailJSON, "warning")
		}
	}

	// If learning handler is available, process the feedback
	if h.learningHandler != nil {
		// Try to call ProcessFeedback if the method exists
		// This uses reflection-like approach to avoid tight coupling
		type processor interface {
			ProcessFeedback(feedbackType string, eventID int64, blobID int, positionJSON string) error
		}
		if p, ok := h.learningHandler.(processor); ok {
			var positionJSON string
			if req.Position != nil {
				positionBytes, _ := json.Marshal(req.Position)
				positionJSON = string(positionBytes)
			}
			_ = p.ProcessFeedback(req.Type, req.EventID, req.BlobID, positionJSON)
		}
	}

	// Return success response with inline message
	response := map[string]interface{}{
		"ok":     true,
		"message": "Feedback recorded",
	}

	// Add inline response based on feedback type
	switch req.Type {
	case "incorrect":
		inlineResp := map[string]interface{}{
			"type":    "adjustment",
			"title":   "Adjusting detection threshold",
			"message": "I've slightly raised the detection threshold for the contributing links. If this keeps happening at this time of day, my hourly baseline will adapt within a few days. You can also adjust sensitivity manually in Settings.",
		}

		// Add explainability snapshot if available
		if req.BlobID > 0 && h.explainabilityHandler != nil {
			// Get current timestamp for the explanation
			timestamp := time.Now().UnixMilli()

			// Fetch explainability for this blob
			// We'll use the blob ID to get the explanation
			// Get explanation from the handler directly
			if exp := h.getExplainabilityForBlob(req.BlobID, timestamp); exp != nil {
				// Build explainability response
				explainabilityData := map[string]interface{}{
					"blob_id":            exp.BlobID,
					"x":                  exp.X,
					"y":                  exp.Y,
					"z":                  exp.Z,
					"confidence":         exp.Confidence,
					"timestamp_ms":       exp.Timestamp,
					"contributing_links": exp.ContributingLinks,
					"all_links":          exp.AllLinks,
				}

				// Add diagnostic info for primary contributing link
				if len(exp.ContributingLinks) > 0 && h.diagnosticEngine != nil {
					primaryLink := exp.ContributingLinks[0]
					linkID := primaryLink.LinkID
					eventTime := time.UnixMilli(timestamp)

					diagnosis := h.diagnosticEngine.GetDiagnosticFor(linkID, eventTime)
					if diagnosis != nil {
						diagData := map[string]interface{}{
							"rule_id":    diagnosis.RuleID,
							"severity":   diagnosis.Severity,
							"title":      diagnosis.Title,
							"detail":     diagnosis.Detail,
							"advice":     diagnosis.Advice,
							"confidence": diagnosis.ConfidenceScore,
						}
						explainabilityData["diagnosis"] = diagData

						// Update the inline response message with diagnostic context
						if diagnosis.RuleID != "no_issue_detected" && diagnosis.RuleID != "insufficient_data" {
							inlineResp["message"] = diagnosis.Detail + " " + diagnosis.Advice
						}
					}
				}

				inlineResp["explainability"] = explainabilityData
			}
		}

		response["inline_response"] = inlineResp
	case "correct":
		response["inline_response"] = map[string]interface{}{
			"type":    "confirmation",
			"title":   "Thanks for confirming!",
			"message": "This helps improve detection accuracy over time.",
		}
	}

	writeJSON(w, http.StatusOK, response)
}

// SubmitFeedback is called by the events handler to process feedback for a specific event.
func (h *FeedbackHandler) SubmitFeedback(w http.ResponseWriter, r *http.Request, req FeedbackRequest) {
	// Validate feedback type
	if req.Type != "correct" && req.Type != "incorrect" && req.Type != "missed" {
		writeJSONError(w, http.StatusBadRequest, "invalid feedback type: must be 'correct', 'incorrect', or 'missed'")
		return
	}

	// Get event details for logging
	var zone, person string
	var detailJSON string

	// Create detail JSON for the event
	details := make(map[string]interface{})
	details["original_event_id"] = req.EventID
	details["feedback"] = req.Type
	if req.Position != nil {
		details["position"] = req.Position
	}

	detailBytes, _ := json.Marshal(details)
	detailJSON = string(detailBytes)

	// Log feedback event
	if h.eventsHandler != nil {
		eventType := "feedback_confirmed"
		if req.Type == "incorrect" {
			eventType = "feedback_corrected"
		} else if req.Type == "missed" {
			eventType = "missed_detection"
		}
		_ = h.eventsHandler.LogEvent(eventType, time.Now(), zone, person, req.BlobID, detailJSON, "info")
	}

	// If learning handler is available, process the feedback
	if h.learningHandler != nil {
		type processor interface {
			ProcessFeedback(feedbackType string, eventID int64, blobID int, positionJSON string) error
		}
		if p, ok := h.learningHandler.(processor); ok {
			var positionJSON string
			if req.Position != nil {
				positionBytes, _ := json.Marshal(req.Position)
				positionJSON = string(positionBytes)
			}
			_ = p.ProcessFeedback(req.Type, req.EventID, req.BlobID, positionJSON)
		}
	}

	// Return success response
	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":     true,
		"message": "Feedback recorded",
	})
}