package common

import (
	"encoding/json"
	"fmt"
)

// Scene metadata is exported from the installed Client's RuntimeFloor tables.
// A complete group list allows us to exclude deleted/client-owned groups
// without maintaining special cases for individual maps or group IDs.
type sceneMetadata struct {
	ClientVersion string `json:"client_version"`
	Floors        map[uint32]struct {
		MapTeleportEntryID uint32                                  `json:"map_teleport_entry_id"`
		DimensionID        *uint32                                 `json:"dimension_id"`
		DimensionGroups    map[uint32][]uint32                     `json:"dimension_groups"`
		GroupProperties    map[uint32]map[string]GroupPropertyRule `json:"group_properties"`
		SavedValues        map[string]int32                        `json:"saved_values"`
		SavedValueRules    map[string]GroupPropertyRule            `json:"saved_value_rules"`
		EntrySavedValues   map[uint32]map[string]int32             `json:"entry_saved_values"`
		Props              map[uint32][]ScenePropInfo              `json:"props"`
		StartAnchor        *AnchorItem                             `json:"start_anchor"`
		FloorDefaultAnchor *AnchorItem                             `json:"floor_default_anchor"`
		Monsters           map[uint32]map[uint32]TeleportInfo      `json:"monsters"`
		GroupCount         int                                     `json:"group_count"`
		Groups             map[uint32]struct {
			LoadSide string `json:"load_side"`
			Deleted  bool   `json:"is_deleted"`
		} `json:"groups"`
	} `json:"floors"`
}

func applySceneMetadata(res *JsonConfig) {
	raw, err := ReadResourceFile("resources/SceneMetadata.json")
	if err != nil {
		return
	}
	var metadata sceneMetadata
	if err := json.Unmarshal(raw, &metadata); err != nil {
		LogInfo("[SCENE] Invalid SceneMetadata: %v", err)
		return
	}
	config, err := LoadRuntimeConfig()
	if err != nil || metadata.ClientVersion != config.ClientVersion {
		LogInfo("[SCENE] SceneMetadata Client revision does not match runtime config; not applied")
		return
	}
	for entryID, configs := range res.LevelOutputConfigs {
		for name, scene := range configs {
			var planeID, floorID uint32
			if n, _ := fmt.Sscanf(name, "P%d_F%d", &planeID, &floorID); n != 2 {
				continue
			}
			floor, ok := metadata.Floors[floorID]
			if !ok {
				continue
			}
			if floor.GroupCount == 0 || len(floor.Groups) != floor.GroupCount {
				LogInfo("[SCENE] Incomplete group metadata for floor %d; not applied", floorID)
				continue
			}
			if target := floor.MapTeleportEntryID; target != 0 {
				entrance, exists := res.MapEntrances[target]
				canonical := fmt.Sprintf("P%d_F%d", planeID, floorID)
				if exists && entrance.PlaneID == planeID && entrance.FloorID == floorID &&
					entrance.EntranceType == "Town" && res.LevelOutputConfigs[target][canonical] != nil {
					if res.MapTeleportEntrances == nil {
						res.MapTeleportEntrances = map[uint32]uint32{}
					}
					res.MapTeleportEntrances[floorID] = target
					res.MapDefaultEntranceMap[floorID] = target
				} else {
					LogInfo("[SCENE] Map teleport entrance %d is not a configured Town on floor %d; routing override not applied", target, floorID)
				}
			}
			if floor.StartAnchor != nil {
				res.SceneAnchors[entryID] = []AnchorItem{*floor.StartAnchor}
			}
			if floor.FloorDefaultAnchor != nil && floor.FloorDefaultAnchor.ID != 0 {
				if res.SceneDefaultAnchors == nil {
					res.SceneDefaultAnchors = map[uint32]AnchorItem{}
				}
				res.SceneDefaultAnchors[floorID] = *floor.FloorDefaultAnchor
			}
			if floor.GroupProperties != nil {
				scene.GroupProperties = floor.GroupProperties
			}
			if floor.DimensionID != nil {
				scene.DimensionID = *floor.DimensionID
			}
			var dimensionGroups map[uint32]bool
			if floor.DimensionGroups != nil {
				ids, exists := floor.DimensionGroups[scene.DimensionID]
				if !exists || len(ids) == 0 {
					LogInfo("[SCENE] Missing group membership for floor %d dimension %d; scene override not applied", floorID, scene.DimensionID)
					continue
				}
				dimensionGroups = make(map[uint32]bool, len(ids))
				for _, id := range ids {
					dimensionGroups[id] = true
				}
			}
			if floor.SavedValues != nil {
				// RuntimeDimension exports the actual DefaultValue, not MaxValue.
				// This applies only to floors with a complete captured override.
				scene.SavedValues = floor.SavedValues
			}
			if overrides, exists := floor.EntrySavedValues[entryID]; exists {
				entrance, known := res.MapEntrances[entryID]
				valid := known && entrance.FloorID == floorID && entrance.PlaneID == planeID
				values := make(map[string]int32, len(floor.SavedValues))
				for key, value := range floor.SavedValues {
					values[key] = value
				}
				for key, value := range overrides {
					rule, known := floor.SavedValueRules[key]
					if !known || value < rule.MinValue || value > rule.MaxValue {
						valid = false
						break
					}
					values[key] = value
				}
				if valid {
					// Never mutate the shared floor defaults: entrances sharing a
					// floor can intentionally represent different story states.
					scene.SavedValues = values
				} else {
					LogInfo("[SCENE] Invalid saved-value profile entry=%d floor=%d; override not applied", entryID, floorID)
				}
			}
			for groupID := range scene.Scenes {
				group, exists := floor.Groups[groupID]
				if !exists || group.Deleted || group.LoadSide == "Client" || (dimensionGroups != nil && !dimensionGroups[groupID]) {
					delete(scene.Scenes, groupID)
					LogInfo("[SCENE] Excluded group entry=%d floor=%d group=%d present=%t deleted=%t side=%s", entryID, floorID, groupID, exists, group.Deleted, group.LoadSide)
					continue
				}
				data := scene.Scenes[groupID]
				if floor.Props != nil {
					data.Props = floor.Props[groupID]
				}
				for index := range data.Monsters {
					monster := &data.Monsters[index]
					if placement, ok := floor.Monsters[groupID][monster.InstID]; ok {
						monster.Pos, monster.Rot = placement.Pos, placement.Rot
					}
				}
				scene.Scenes[groupID] = data
			}
			// Resource updates may introduce server props in previously empty groups.
			for groupID, props := range floor.Props {
				group, exists := floor.Groups[groupID]
				if !exists || group.Deleted || group.LoadSide == "Client" || (dimensionGroups != nil && !dimensionGroups[groupID]) {
					continue
				}
				data := scene.Scenes[groupID]
				data.Props = props
				scene.Scenes[groupID] = data
			}
		}
	}
}