// Package specs provides SPEC property resolution — mapping semantic property
// names (like "on", "mode", "target-temperature") to siid/piid pairs.
//
// This enables device control abstractions to work across different Xiaomi
// device models that may assign different siid/piid numbering to the same
// functional property.
package specs

import (
	"strings"

	"git.zeroonesoft.cn/golib/xiaomihome/miot"
)

// PropertyResolver resolves semantic property names to siid/piid pairs.
// It indexes a device's SPEC instance by property type (Type field),
// description (translated), and data format for flexible lookup.
type PropertyResolver struct {
	spec      *miot.MIoTSpecInstance
	byType    map[string]*miot.MIoTSpecProperty   // type → first matching property
	byDesc    map[string]*miot.MIoTSpecProperty   // description → property
	byFormat  map[string][]*miot.MIoTSpecProperty // format → properties
	actionMap map[int]map[string]int              // siid → (actionType → aiid)
}

// NewPropertyResolver creates a PropertyResolver from a SPEC instance.
// Returns nil if spec is nil.
func NewPropertyResolver(spec *miot.MIoTSpecInstance) *PropertyResolver {
	if spec == nil {
		return nil
	}

	r := &PropertyResolver{
		spec:      spec,
		byType:    make(map[string]*miot.MIoTSpecProperty),
		byDesc:    make(map[string]*miot.MIoTSpecProperty),
		byFormat:  make(map[string][]*miot.MIoTSpecProperty),
		actionMap: make(map[int]map[string]int),
	}

	// Index all properties across all services
	for _, svc := range spec.Services {
		for i := range svc.Properties {
			prop := svc.Properties[i]

			// Index by type (first match wins for primary lookup)
			name := propShortName(prop.Type)
			if name != "" {
				if _, exists := r.byType[name]; !exists {
					r.byType[name] = prop
				}
			}

			// Index by translated description
			if prop.DescriptionTrans != "" {
				if _, exists := r.byDesc[prop.DescriptionTrans]; !exists {
					r.byDesc[prop.DescriptionTrans] = prop
				}
			}
			// Fallback: index by raw description
			if prop.Description != "" {
				if _, exists := r.byDesc[prop.Description]; !exists {
					r.byDesc[prop.Description] = prop
				}
			}

			// Index by format
			if prop.Format != "" {
				r.byFormat[prop.Format] = append(r.byFormat[prop.Format], prop)
			}
		}

		// Index actions
		for _, act := range svc.Actions {
			if r.actionMap[act.SIID] == nil {
				r.actionMap[act.SIID] = make(map[string]int)
			}
			if act.Type != "" {
				r.actionMap[act.SIID][act.Type] = act.AIID
			}
		}
	}

	return r
}

// FindByType looks up a property by its SPEC type string (e.g., "on", "mode",
// "target-temperature", "fan-level", "brightness").
// Returns (siid, piid, found).
func (r *PropertyResolver) FindByType(propType string) (siid, piid int, found bool) {
	if prop, ok := r.byType[propType]; ok {
		return prop.SIID, prop.PIID, true
	}
	return 0, 0, false
}

// FindByFormat looks up the first property with the given format string within
// a specific service (siid). Returns (piid, found).
// format examples: "bool", "uint8", "uint16", "float", "string"
func (r *PropertyResolver) FindByFormat(format string, siid int) (piid int, found bool) {
	props, ok := r.byFormat[format]
	if !ok {
		return 0, false
	}
	for _, p := range props {
		if p.SIID == siid {
			return p.PIID, true
		}
	}
	return 0, false
}

// FindByDescription looks up a property by its description text (translated or raw).
// Returns (siid, piid, found).
func (r *PropertyResolver) FindByDescription(desc string) (siid, piid int, found bool) {
	if prop, ok := r.byDesc[desc]; ok {
		return prop.SIID, prop.PIID, true
	}
	return 0, 0, false
}

// FindAction looks up an action by its type within a specific service.
// Returns (aiid, found).
func (r *PropertyResolver) FindAction(siid int, actionType string) (aiid int, found bool) {
	if actions, ok := r.actionMap[siid]; ok {
		if aiid, ok := actions[actionType]; ok {
			return aiid, true
		}
	}
	return 0, false
}

// GetAllProperties returns all properties for a given siid.
func (r *PropertyResolver) GetAllProperties(siid int) []*miot.MIoTSpecProperty {
	var result []*miot.MIoTSpecProperty
	for _, svc := range r.spec.Services {
		if svc.IID == siid {
			return svc.Properties
		}
	}
	return result
}

// GetProperty returns a specific property by siid/piid.
func (r *PropertyResolver) GetProperty(siid, piid int) *miot.MIoTSpecProperty {
	for _, svc := range r.spec.Services {
		if svc.IID != siid {
			continue
		}
		for _, p := range svc.Properties {
			if p.PIID == piid {
				return p
			}
		}
	}
	return nil
}

// Spec returns the underlying SPEC instance.
func (r *PropertyResolver) Spec() *miot.MIoTSpecInstance {
	return r.spec
}

// propShortName extracts the short name from a SPEC property URN.
func propShortName(urn string) string {
	parts := strings.Split(urn, ":")
	if len(parts) >= 4 && parts[2] == "property" {
		return parts[3]
	}
	return urn
}