package agent

import (
	"context"

	"gitea.stevedudenhoeffer.com/steve/majordomo/llm"

	"gitea.stevedudenhoeffer.com/steve/pansy/internal/service"
)

// NewToolbox builds a majordomo toolbox over pansy's service layer, bound to a
// single acting user. Every tool call runs as actorID, so pansy's permission
// checks (requireGardenRole / objectForRole) apply unchanged. Construct one per
// authenticated agent session:
//
//	box := agent.NewToolbox(svc, session.UserID)
//	agent.Run(ctx, model, box, "fill the NE corner with garlic")
func NewToolbox(svc *service.Service, actorID int64) *llm.Toolbox {
	a := &adapter{svc: svc, actor: actorID}
	return llm.NewToolbox("pansy",
		llm.DefineTool("list_gardens",
			"List the gardens the user can see (owned and shared), with the user's role on each.",
			a.listGardens),
		llm.DefineTool("describe_garden",
			"Summarize a garden: its dimensions, objects (with sizes/positions/version), and each object's active plantings with a rough compass location.",
			a.describeGarden),
		llm.DefineTool("create_object",
			"Add an object (bed, grow_bag, container, in_ground, tree, path, structure) to a garden, positioned by its center in garden cm.",
			a.createObject),
		llm.DefineTool("move_object",
			"Move an object to a new center position (garden cm). Needs the object's current version from describe_garden.",
			a.moveObject),
		llm.DefineTool("place_planting",
			"Place one plop of a plant inside a plantable object, positioned in the object's LOCAL frame (0,0 = object center, -y = north).",
			a.placePlanting),
		llm.DefineTool("fill_region",
			"Fill part of a plantable object with one plant, hex-packed at the plant's spacing. "+
				"region is a compass name, not coordinates: nw|ne|sw|se for the quarter corners, "+
				"north|south|east|west (or top|bottom|left|right) for halves, or all for the whole thing. "+
				"North is the top of the garden. Example: to replant a whole bed, clear_object then "+
				"fill_region with region=all. Filling skips spots already covered by an existing plant, "+
				"so it is safe to run twice.",
			a.fillRegion),
		llm.DefineTool("clear_object",
			"Remove all plants from an object. They are soft-removed, so the planting history for past "+
				"seasons is kept and the change can be undone. Use this before replanting a bed with "+
				"something else.",
			a.clearObject),
		llm.DefineTool("find_plant",
			"Look up plants in the user's catalog by name or category, to get the plantId that "+
				"place_planting and fill_region need. Returns SEVERAL candidates when the query is "+
				"ambiguous — \"garlic\" may match both the built-in \"Garlic\" and a custom \"German Red "+
				"Garlic\" — so pick the one that fits what the user asked for, or ask them which. Each "+
				"result also reports how much seed the user has left of it, when they have recorded any.",
			a.findPlant),
		llm.DefineTool("create_plant",
			"Add a new plant to the user's own catalog, for when they name a variety that isn't in it "+
				"yet. Check find_plant first — creating a duplicate of something that already exists is "+
				"worse than reusing it. The plant belongs to the user, not to any garden.",
			a.createPlant),
		llm.DefineTool("add_journal_entry",
			"Write a dated observation into the garden's grow journal — what happened, and when. "+
				"Attach it to one bed with objectId when it is about that bed. This is for events "+
				"(\"powdery mildew on the west bed\", \"first frost\"), not for descriptions of what a "+
				"thing is. observedAt defaults to today; set it to backdate.",
			a.addJournalEntry),
	)
}

// adapter carries the service and the acting user for the tool handlers.
type adapter struct {
	svc   *service.Service
	actor int64
}

func (a *adapter) listGardens(ctx context.Context, _ struct{}) (any, error) {
	return a.svc.ListGardens(ctx, a.actor)
}

func (a *adapter) describeGarden(ctx context.Context, args struct {
	GardenID int64 `json:"gardenId" description:"id of the garden to describe"`
}) (any, error) {
	return a.svc.DescribeGarden(ctx, a.actor, args.GardenID)
}

func (a *adapter) createObject(ctx context.Context, args struct {
	GardenID int64   `json:"gardenId" description:"garden to add the object to"`
	Kind     string  `json:"kind" description:"bed | grow_bag | container | in_ground | tree | path | structure"`
	Name     string  `json:"name" description:"optional label for the object"`
	Shape    string  `json:"shape" description:"rect or circle (default rect)"`
	XCM      float64 `json:"xCm" description:"center x in garden cm"`
	YCM      float64 `json:"yCm" description:"center y in garden cm"`
	WidthCM  float64 `json:"widthCm" description:"width in cm (a circle's diameter)"`
	HeightCM float64 `json:"heightCm" description:"height in cm"`
}) (any, error) {
	return a.svc.CreateObject(ctx, a.actor, args.GardenID, service.ObjectInput{
		Kind: args.Kind, Name: args.Name, Shape: args.Shape,
		XCM: args.XCM, YCM: args.YCM, WidthCM: args.WidthCM, HeightCM: args.HeightCM,
	})
}

func (a *adapter) moveObject(ctx context.Context, args struct {
	ObjectID int64   `json:"objectId" description:"object to move"`
	XCM      float64 `json:"xCm" description:"new center x in garden cm"`
	YCM      float64 `json:"yCm" description:"new center y in garden cm"`
	Version  int64   `json:"version" description:"the object's current version (from describe_garden)"`
}) (any, error) {
	return a.svc.UpdateObject(ctx, a.actor, args.ObjectID,
		service.ObjectPatch{XCM: &args.XCM, YCM: &args.YCM}, args.Version)
}

func (a *adapter) placePlanting(ctx context.Context, args struct {
	ObjectID int64   `json:"objectId" description:"plantable object to plant in"`
	PlantID  int64   `json:"plantId" description:"plant to place"`
	XCM      float64 `json:"xCm" description:"center x in the object's local frame (cm; 0,0 = center, -y = north)"`
	YCM      float64 `json:"yCm" description:"center y in the object's local frame (cm)"`
	RadiusCM float64 `json:"radiusCm" description:"plop radius in cm"`
	Count    *int    `json:"count" description:"optional explicit plant count; omit to derive from area ÷ spacing²"`
}) (any, error) {
	return a.svc.CreatePlanting(ctx, a.actor, args.ObjectID, service.PlantingInput{
		PlantID: args.PlantID, XCM: args.XCM, YCM: args.YCM, RadiusCM: args.RadiusCM, Count: args.Count,
	})
}

func (a *adapter) fillRegion(ctx context.Context, args struct {
	ObjectID        int64    `json:"objectId" description:"plantable object to fill"`
	Region          string   `json:"region" description:"nw|ne|sw|se corner, north|south|east|west (or top|bottom|left|right) half, or all"`
	PlantID         int64    `json:"plantId" description:"plant to fill with"`
	SpacingOverride *float64 `json:"spacingOverrideCm" description:"optional in-row spacing override in cm; omit to use the plant's spacing"`
	Mode            string   `json:"mode" enum:"clump,grid" description:"clump (default) drops a few fat clumps for a quick sketch; grid lays out individual plants in rows at true spacing, a layout you could plant from"`
}) (any, error) {
	return a.svc.FillNamedRegion(ctx, a.actor, args.ObjectID, args.Region, args.PlantID, args.SpacingOverride, service.FillLayout(args.Mode))
}

func (a *adapter) findPlant(ctx context.Context, args struct {
	Query string `json:"query" description:"plant name or category to search for, e.g. \"cucumber\" or \"herb\"; empty lists the catalog"`
}) (any, error) {
	return a.svc.FindPlants(ctx, a.actor, args.Query)
}

func (a *adapter) createPlant(ctx context.Context, args struct {
	Name           string  `json:"name" description:"the variety's name, e.g. \"German Red Garlic\""`
	Category       string  `json:"category" description:"vegetable | herb | flower | fruit | tree_shrub | cover"`
	SpacingCM      float64 `json:"spacingCm" description:"mature in-row spacing in cm; this is what fill_region packs to"`
	Color          string  `json:"color" description:"hex color for the plant on the canvas, e.g. #8a5a8a"`
	Icon           string  `json:"icon" description:"a single emoji to draw it with, e.g. 🧄"`
	DaysToMaturity *int    `json:"daysToMaturity" description:"optional days from planting to harvest"`
	SourceURL      string  `json:"sourceUrl" description:"optional http(s) link to where the seed came from"`
	Vendor         string  `json:"vendor" description:"optional vendor name, e.g. \"Johnny\u0027s Selected Seeds\""`
}) (any, error) {
	return a.svc.CreatePlant(ctx, a.actor, service.PlantInput{
		Name: args.Name, Category: args.Category, SpacingCM: args.SpacingCM,
		Color: args.Color, Icon: args.Icon, DaysToMaturity: args.DaysToMaturity,
		SourceURL: args.SourceURL, Vendor: args.Vendor,
	})
}

func (a *adapter) addJournalEntry(ctx context.Context, args struct {
	GardenID   int64  `json:"gardenId" description:"garden the observation is about"`
	ObjectID   *int64 `json:"objectId" description:"optional bed the observation is about; omit for a garden-level note"`
	Body       string `json:"body" description:"what happened, in plain words"`
	ObservedAt string `json:"observedAt" description:"optional date it happened, YYYY-MM-DD; defaults to today"`
}) (any, error) {
	in := service.JournalInput{ObjectID: args.ObjectID, Body: args.Body}
	if args.ObservedAt != "" {
		in.ObservedAt = &args.ObservedAt
	}
	return a.svc.CreateJournalEntry(ctx, a.actor, args.GardenID, in)
}

func (a *adapter) clearObject(ctx context.Context, args struct {
	ObjectID int64 `json:"objectId" description:"object to remove all plants from"`
}) (any, error) {
	n, err := a.svc.ClearObject(ctx, a.actor, args.ObjectID)
	if err != nil {
		return nil, err
	}
	return map[string]int{"cleared": n}, nil
}