package handlers

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
)

// slotInfo describes a declared slot and its contributors.
type slotInfo struct {
	Host         string           `json:"host"`
	Description  string           `json:"description"`
	Context      map[string]any   `json:"context,omitempty"`
	Contributors []slotContributor `json:"contributors"`
}

// slotContributor describes one package's contribution to a slot.
type slotContributor struct {
	Package     string `json:"package"`
	Label       string `json:"label,omitempty"`
	Icon        string `json:"icon,omitempty"`
	Description string `json:"description,omitempty"`
}

// ListSlots returns an aggregated map of all declared slots across installed
// packages together with their contributors. Built on-the-fly from manifests.
// GET /api/v1/admin/slots
func (h *PackageHandler) ListSlots(c *gin.Context) {
	pkgs, err := h.stores.Packages.List(c.Request.Context())
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to list packages"})
		return
	}

	slots := map[string]*slotInfo{}

	// Pass 1: collect declared slots from host surfaces
	for _, pkg := range pkgs {
		slotsRaw, ok := pkg.Manifest["slots"].(map[string]any)
		if !ok {
			continue
		}
		for name, v := range slotsRaw {
			fullName := pkg.ID + ":" + name
			entry, ok := v.(map[string]any)
			if !ok {
				continue
			}
			desc, _ := entry["description"].(string)
			var ctx map[string]any
			if c, ok := entry["context"].(map[string]any); ok {
				ctx = c
			}
			slots[fullName] = &slotInfo{
				Host:         pkg.ID,
				Description:  desc,
				Context:      ctx,
				Contributors: []slotContributor{},
			}
		}
	}

	// Pass 2: collect contributions
	for _, pkg := range pkgs {
		if !pkg.Enabled {
			continue
		}
		contribs, ok := pkg.Manifest["contributes"].(map[string]any)
		if !ok {
			continue
		}
		for slotKey, v := range contribs {
			// Ensure the slot entry exists (contributor can arrive before host)
			if _, exists := slots[slotKey]; !exists {
				host := slotKey
				if idx := strings.Index(slotKey, ":"); idx >= 0 {
					host = slotKey[:idx]
				}
				slots[slotKey] = &slotInfo{
					Host:         host,
					Contributors: []slotContributor{},
				}
			}
			contrib := slotContributor{Package: pkg.ID}
			if m, ok := v.(map[string]any); ok {
				contrib.Label, _ = m["label"].(string)
				contrib.Icon, _ = m["icon"].(string)
				contrib.Description, _ = m["description"].(string)
			}
			slots[slotKey].Contributors = append(slots[slotKey].Contributors, contrib)
		}
	}

	c.JSON(http.StatusOK, gin.H{"data": slots})
}