package handlers

import (
	"net/http"

	"github.com/breakpilot/ai-compliance-sdk/internal/iace"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

// ============================================================================
// ISO 12100 Endpoints
// ============================================================================

// ListLifecyclePhases handles GET /lifecycle-phases
// Returns the 12 machine lifecycle phases with DE/EN labels.
func (h *IACEHandler) ListLifecyclePhases(c *gin.Context) {
	phases, err := h.store.ListLifecyclePhases(c.Request.Context())
	if err != nil {
		// Fallback: return hardcoded 25 phases if DB table not yet migrated
		phases = []iace.LifecyclePhaseInfo{
			{ID: "transport", LabelDE: "Transport", LabelEN: "Transport", Sort: 1},
			{ID: "storage", LabelDE: "Lagerung", LabelEN: "Storage", Sort: 2},
			{ID: "assembly", LabelDE: "Montage", LabelEN: "Assembly", Sort: 3},
			{ID: "installation", LabelDE: "Installation", LabelEN: "Installation", Sort: 4},
			{ID: "commissioning", LabelDE: "Inbetriebnahme", LabelEN: "Commissioning", Sort: 5},
			{ID: "parameterization", LabelDE: "Parametrierung", LabelEN: "Parameterization", Sort: 6},
			{ID: "setup", LabelDE: "Einrichten / Setup", LabelEN: "Setup", Sort: 7},
			{ID: "normal_operation", LabelDE: "Normalbetrieb", LabelEN: "Normal Operation", Sort: 8},
			{ID: "automatic_operation", LabelDE: "Automatikbetrieb", LabelEN: "Automatic Operation", Sort: 9},
			{ID: "manual_operation", LabelDE: "Handbetrieb", LabelEN: "Manual Operation", Sort: 10},
			{ID: "teach_mode", LabelDE: "Teach-Modus", LabelEN: "Teach Mode", Sort: 11},
			{ID: "production_start", LabelDE: "Produktionsstart", LabelEN: "Production Start", Sort: 12},
			{ID: "production_stop", LabelDE: "Produktionsstopp", LabelEN: "Production Stop", Sort: 13},
			{ID: "process_monitoring", LabelDE: "Prozessueberwachung", LabelEN: "Process Monitoring", Sort: 14},
			{ID: "cleaning", LabelDE: "Reinigung", LabelEN: "Cleaning", Sort: 15},
			{ID: "maintenance", LabelDE: "Wartung", LabelEN: "Maintenance", Sort: 16},
			{ID: "inspection", LabelDE: "Inspektion", LabelEN: "Inspection", Sort: 17},
			{ID: "calibration", LabelDE: "Kalibrierung", LabelEN: "Calibration", Sort: 18},
			{ID: "fault_clearing", LabelDE: "Stoerungsbeseitigung", LabelEN: "Fault Clearing", Sort: 19},
			{ID: "repair", LabelDE: "Reparatur", LabelEN: "Repair", Sort: 20},
			{ID: "changeover", LabelDE: "Umruestung", LabelEN: "Changeover", Sort: 21},
			{ID: "software_update", LabelDE: "Software-Update", LabelEN: "Software Update", Sort: 22},
			{ID: "remote_maintenance", LabelDE: "Fernwartung", LabelEN: "Remote Maintenance", Sort: 23},
			{ID: "decommissioning", LabelDE: "Ausserbetriebnahme", LabelEN: "Decommissioning", Sort: 24},
			{ID: "disposal", LabelDE: "Demontage / Entsorgung", LabelEN: "Dismantling / Disposal", Sort: 25},
		}
	}

	if phases == nil {
		phases = []iace.LifecyclePhaseInfo{}
	}

	c.JSON(http.StatusOK, gin.H{
		"lifecycle_phases": phases,
		"total":            len(phases),
	})
}

// ListProtectiveMeasures handles GET /protective-measures-library
// Returns the protective measures library, optionally filtered by ?reduction_type and ?hazard_category.
func (h *IACEHandler) ListProtectiveMeasures(c *gin.Context) {
	reductionType := c.Query("reduction_type")
	hazardCategory := c.Query("hazard_category")

	all := iace.GetProtectiveMeasureLibrary()

	var filtered []iace.ProtectiveMeasureEntry
	for _, entry := range all {
		if reductionType != "" && entry.ReductionType != reductionType {
			continue
		}
		if hazardCategory != "" && entry.HazardCategory != hazardCategory && entry.HazardCategory != "general" && entry.HazardCategory != "" {
			continue
		}
		filtered = append(filtered, entry)
	}

	if filtered == nil {
		filtered = []iace.ProtectiveMeasureEntry{}
	}

	c.JSON(http.StatusOK, gin.H{
		"protective_measures": filtered,
		"total":               len(filtered),
	})
}

// ValidateMitigationHierarchy handles POST /projects/:id/validate-mitigation-hierarchy
// Validates if the proposed mitigation type follows the 3-step hierarchy principle.
func (h *IACEHandler) ValidateMitigationHierarchy(c *gin.Context) {
	projectID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid project ID"})
		return
	}

	var req iace.ValidateMitigationHierarchyRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// Get existing mitigations for the hazard
	mitigations, err := h.store.ListMitigations(c.Request.Context(), req.HazardID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	_ = projectID // projectID used for authorization context

	warnings := h.engine.ValidateProtectiveMeasureHierarchy(req.ReductionType, mitigations)

	c.JSON(http.StatusOK, iace.ValidateMitigationHierarchyResponse{
		Valid:    len(warnings) == 0,
		Warnings: warnings,
	})
}

// ListRoles handles GET /roles
// Returns the 20 affected person roles reference data.
func (h *IACEHandler) ListRoles(c *gin.Context) {
	roles, err := h.store.ListRoles(c.Request.Context())
	if err != nil {
		// Fallback: return hardcoded roles if DB table not yet migrated
		roles = []iace.RoleInfo{
			{ID: "operator", LabelDE: "Maschinenbediener", LabelEN: "Machine Operator", Sort: 1},
			{ID: "setter", LabelDE: "Einrichter", LabelEN: "Setter", Sort: 2},
			{ID: "maintenance_tech", LabelDE: "Wartungstechniker", LabelEN: "Maintenance Technician", Sort: 3},
			{ID: "service_tech", LabelDE: "Servicetechniker", LabelEN: "Service Technician", Sort: 4},
			{ID: "cleaning_staff", LabelDE: "Reinigungspersonal", LabelEN: "Cleaning Staff", Sort: 5},
			{ID: "production_manager", LabelDE: "Produktionsleiter", LabelEN: "Production Manager", Sort: 6},
			{ID: "safety_officer", LabelDE: "Sicherheitsbeauftragter", LabelEN: "Safety Officer", Sort: 7},
			{ID: "electrician", LabelDE: "Elektriker", LabelEN: "Electrician", Sort: 8},
			{ID: "software_engineer", LabelDE: "Softwareingenieur", LabelEN: "Software Engineer", Sort: 9},
			{ID: "maintenance_manager", LabelDE: "Instandhaltungsleiter", LabelEN: "Maintenance Manager", Sort: 10},
			{ID: "plant_operator", LabelDE: "Anlagenfahrer", LabelEN: "Plant Operator", Sort: 11},
			{ID: "qa_inspector", LabelDE: "Qualitaetssicherung", LabelEN: "Quality Assurance", Sort: 12},
			{ID: "logistics_staff", LabelDE: "Logistikpersonal", LabelEN: "Logistics Staff", Sort: 13},
			{ID: "subcontractor", LabelDE: "Fremdfirma / Subunternehmer", LabelEN: "Subcontractor", Sort: 14},
			{ID: "visitor", LabelDE: "Besucher", LabelEN: "Visitor", Sort: 15},
			{ID: "auditor", LabelDE: "Auditor", LabelEN: "Auditor", Sort: 16},
			{ID: "it_admin", LabelDE: "IT-Administrator", LabelEN: "IT Administrator", Sort: 17},
			{ID: "remote_service", LabelDE: "Fernwartungsdienst", LabelEN: "Remote Service", Sort: 18},
			{ID: "plant_owner", LabelDE: "Betreiber", LabelEN: "Plant Owner / Operator", Sort: 19},
			{ID: "emergency_responder", LabelDE: "Notfallpersonal", LabelEN: "Emergency Responder", Sort: 20},
		}
	}

	if roles == nil {
		roles = []iace.RoleInfo{}
	}

	c.JSON(http.StatusOK, gin.H{
		"roles": roles,
		"total": len(roles),
	})
}

// ListEvidenceTypes handles GET /evidence-types
// Returns the 50 evidence/verification types reference data.
func (h *IACEHandler) ListEvidenceTypes(c *gin.Context) {
	types, err := h.store.ListEvidenceTypes(c.Request.Context())
	if err != nil {
		// Fallback: return empty if not migrated
		types = []iace.EvidenceTypeInfo{}
	}

	if types == nil {
		types = []iace.EvidenceTypeInfo{}
	}

	category := c.Query("category")
	if category != "" {
		var filtered []iace.EvidenceTypeInfo
		for _, t := range types {
			if t.Category == category {
				filtered = append(filtered, t)
			}
		}
		if filtered == nil {
			filtered = []iace.EvidenceTypeInfo{}
		}
		types = filtered
	}

	c.JSON(http.StatusOK, gin.H{
		"evidence_types": types,
		"total":          len(types),
	})
}

// ============================================================================
// Component Library & Energy Sources (Phase 1)
// ============================================================================

// ListComponentLibrary handles GET /component-library
// Returns the built-in component library with optional category filter.
func (h *IACEHandler) ListComponentLibrary(c *gin.Context) {
	category := c.Query("category")

	all := iace.GetComponentLibrary()
	var filtered []iace.ComponentLibraryEntry
	for _, entry := range all {
		if category != "" && entry.Category != category {
			continue
		}
		filtered = append(filtered, entry)
	}

	if filtered == nil {
		filtered = []iace.ComponentLibraryEntry{}
	}

	c.JSON(http.StatusOK, gin.H{
		"components": filtered,
		"total":      len(filtered),
	})
}

// ListEnergySources handles GET /energy-sources
// Returns the built-in energy source library.
func (h *IACEHandler) ListEnergySources(c *gin.Context) {
	sources := iace.GetEnergySources()
	c.JSON(http.StatusOK, gin.H{
		"energy_sources": sources,
		"total":          len(sources),
	})
}

// ============================================================================
// Tag Taxonomy (Phase 2)
// ============================================================================

// ListTags handles GET /tags
// Returns the tag taxonomy with optional domain filter.
func (h *IACEHandler) ListTags(c *gin.Context) {
	domain := c.Query("domain")

	all := iace.GetTagTaxonomy()
	var filtered []iace.TagEntry
	for _, entry := range all {
		if domain != "" && entry.Domain != domain {
			continue
		}
		filtered = append(filtered, entry)
	}

	if filtered == nil {
		filtered = []iace.TagEntry{}
	}

	c.JSON(http.StatusOK, gin.H{
		"tags":  filtered,
		"total": len(filtered),
	})
}

// ============================================================================
// Hazard Patterns & Pattern Engine (Phase 3+4)
// ============================================================================

// ListHazardPatterns handles GET /hazard-patterns
// Returns all built-in hazard patterns.
func (h *IACEHandler) ListHazardPatterns(c *gin.Context) {
	patterns := iace.GetBuiltinHazardPatterns()
	patterns = append(patterns, iace.GetExtendedHazardPatterns()...)
	c.JSON(http.StatusOK, gin.H{
		"patterns": patterns,
		"total":    len(patterns),
	})
}

// MatchPatterns handles POST /projects/:id/match-patterns
// Runs the pattern engine against the project's components and energy sources.
func (h *IACEHandler) MatchPatterns(c *gin.Context) {
	projectID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid project ID"})
		return
	}

	// Verify project exists
	project, err := h.store.GetProject(c.Request.Context(), projectID)
	if err != nil || project == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "project not found"})
		return
	}

	var input iace.MatchInput
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	engine := iace.NewPatternEngine()
	result := engine.Match(input)

	c.JSON(http.StatusOK, result)
}

// ApplyPatternResults handles POST /projects/:id/apply-patterns
// Accepts matched patterns and creates concrete hazards, mitigations, and
// verification plans in the project.
func (h *IACEHandler) ApplyPatternResults(c *gin.Context) {
	projectID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid project ID"})
		return
	}

	tenantID, err := getTenantID(c)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	project, err := h.store.GetProject(c.Request.Context(), projectID)
	if err != nil || project == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "project not found"})
		return
	}

	var req struct {
		AcceptedHazards  []iace.CreateHazardRequest           `json:"accepted_hazards"`
		AcceptedMeasures []iace.CreateMitigationRequest       `json:"accepted_measures"`
		AcceptedEvidence []iace.CreateVerificationPlanRequest `json:"accepted_evidence"`
		SourcePatternIDs []string                             `json:"source_pattern_ids"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	ctx := c.Request.Context()
	var createdHazards int
	var createdMeasures int
	var createdEvidence int

	// Create hazards
	for _, hazardReq := range req.AcceptedHazards {
		hazardReq.ProjectID = projectID
		_, err := h.store.CreateHazard(ctx, hazardReq)
		if err != nil {
			continue
		}
		createdHazards++
	}

	// Create mitigations
	for _, mitigReq := range req.AcceptedMeasures {
		_, err := h.store.CreateMitigation(ctx, mitigReq)
		if err != nil {
			continue
		}
		createdMeasures++
	}

	// Create verification plans
	for _, evidReq := range req.AcceptedEvidence {
		evidReq.ProjectID = projectID
		_, err := h.store.CreateVerificationPlan(ctx, evidReq)
		if err != nil {
			continue
		}
		createdEvidence++
	}

	// Audit trail
	h.store.AddAuditEntry(ctx, projectID, "pattern_matching", projectID,
		iace.AuditActionCreate, tenantID.String(),
		nil,
		mustMarshalJSON(map[string]interface{}{
			"source_patterns":  req.SourcePatternIDs,
			"created_hazards":  createdHazards,
			"created_measures": createdMeasures,
			"created_evidence": createdEvidence,
		}),
	)

	c.JSON(http.StatusOK, gin.H{
		"created_hazards":  createdHazards,
		"created_measures": createdMeasures,
		"created_evidence": createdEvidence,
		"message":          "Pattern results applied successfully",
	})
}

// SuggestMeasuresForHazard handles POST /projects/:id/hazards/:hid/suggest-measures
// Suggests measures for a specific hazard based on its tags and category.
func (h *IACEHandler) SuggestMeasuresForHazard(c *gin.Context) {
	hazardID, err := uuid.Parse(c.Param("hid"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid hazard ID"})
		return
	}

	hazard, err := h.store.GetHazard(c.Request.Context(), hazardID)
	if err != nil || hazard == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "hazard not found"})
		return
	}

	// Find measures matching the hazard category
	all := iace.GetProtectiveMeasureLibrary()
	var suggested []iace.ProtectiveMeasureEntry
	for _, m := range all {
		if m.HazardCategory == hazard.Category || m.HazardCategory == "general" {
			suggested = append(suggested, m)
		}
	}

	if suggested == nil {
		suggested = []iace.ProtectiveMeasureEntry{}
	}

	c.JSON(http.StatusOK, gin.H{
		"hazard_id":          hazardID.String(),
		"hazard_category":    hazard.Category,
		"suggested_measures": suggested,
		"total":              len(suggested),
	})
}

// SuggestEvidenceForMitigation handles POST /projects/:id/mitigations/:mid/suggest-evidence
// Suggests evidence types for a specific mitigation.
func (h *IACEHandler) SuggestEvidenceForMitigation(c *gin.Context) {
	mitigationID, err := uuid.Parse(c.Param("mid"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid mitigation ID"})
		return
	}

	mitigation, err := h.store.GetMitigation(c.Request.Context(), mitigationID)
	if err != nil || mitigation == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "mitigation not found"})
		return
	}

	// Map reduction type to relevant evidence tags
	var relevantTags []string
	switch mitigation.ReductionType {
	case iace.ReductionTypeDesign:
		relevantTags = []string{"design_evidence", "analysis_evidence"}
	case iace.ReductionTypeProtective:
		relevantTags = []string{"test_evidence", "inspection_evidence"}
	case iace.ReductionTypeInformation:
		relevantTags = []string{"training_evidence", "operational_evidence"}
	}

	resolver := iace.NewTagResolver()
	suggested := resolver.FindEvidenceByTags(relevantTags)

	if suggested == nil {
		suggested = []iace.EvidenceTypeInfo{}
	}

	c.JSON(http.StatusOK, gin.H{
		"mitigation_id":      mitigationID.String(),
		"reduction_type":     string(mitigation.ReductionType),
		"suggested_evidence": suggested,
		"total":              len(suggested),
	})
}