package api

import (
	"net/http"
	"strings"

	"reanimator/internal/history"
	"reanimator/internal/repository/registry"
	"reanimator/internal/repository/timeline"
)

type AssetComponentDependencies struct {
	Assets        *registry.AssetRepository
	Components    *registry.ComponentRepository
	Installations *registry.InstallationRepository
	Timeline      *timeline.EventRepository
	History       *history.Service
}

type assetComponentHandlers struct {
	deps AssetComponentDependencies
}

func RegisterAssetComponentRoutes(mux *http.ServeMux, deps AssetComponentDependencies) {
	h := assetComponentHandlers{deps: deps}
	mux.HandleFunc("/api/assets/", h.handleAssetAPI)
	mux.HandleFunc("/api/components/search-lite", h.handleComponentSearchLite)
	mux.HandleFunc("/assets/", h.handleAsset)
	mux.HandleFunc("/components/", h.handleComponent)
}

func (h assetComponentHandlers) handleAsset(w http.ResponseWriter, r *http.Request) {
	if strings.HasSuffix(r.URL.Path, "/timeline") {
		if r.Method != http.MethodGet {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}
		if h.deps.Timeline == nil {
			if h.deps.History == nil {
				writeError(w, http.StatusInternalServerError, "timeline unavailable")
				return
			}
		}
		if h.deps.History != nil {
			id := parseTimelineID(r.URL.Path, "/assets/")
			if id == "" {
				writeError(w, http.StatusNotFound, "asset timeline not found")
				return
			}
			historyHandlers{deps: HistoryDependencies{Service: h.deps.History}}.handleTimeline(w, r, "asset", id)
			return
		}
		id := parseTimelineID(r.URL.Path, "/assets/")
		if id == "" {
			writeError(w, http.StatusNotFound, "asset timeline not found")
			return
		}
		writeTimelineResponse(w, r, h.deps.Timeline, "asset", id)
		return
	}

	if strings.HasSuffix(r.URL.Path, "/components") {
		if r.Method != http.MethodGet {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}
		if h.deps.Installations == nil {
			writeError(w, http.StatusInternalServerError, "installations unavailable")
			return
		}
		id, ok := parseSubresourceID(r.URL.Path, "/assets/", "/components")
		if !ok {
			writeError(w, http.StatusNotFound, "asset components not found")
			return
		}
		items, err := h.deps.Installations.ListCurrentComponentsByAsset(r.Context(), id)
		if err != nil {
			writeError(w, http.StatusInternalServerError, "list components failed")
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{"items": items})
		return
	}

	if r.Method != http.MethodGet {
		w.WriteHeader(http.StatusMethodNotAllowed)
		return
	}

	id, ok := parseID(r.URL.Path, "/assets/")
	if !ok {
		writeError(w, http.StatusNotFound, "asset not found")
		return
	}

	item, err := h.deps.Assets.Get(r.Context(), id)
	if err != nil {
		switch err {
		case registry.ErrNotFound:
			writeError(w, http.StatusNotFound, "asset not found")
		default:
			writeError(w, http.StatusInternalServerError, "get asset failed")
		}
		return
	}
	writeJSON(w, http.StatusOK, item)
}

func (h assetComponentHandlers) handleComponent(w http.ResponseWriter, r *http.Request) {
	if strings.HasSuffix(r.URL.Path, "/timeline") {
		if r.Method != http.MethodGet {
			w.WriteHeader(http.StatusMethodNotAllowed)
			return
		}
		if h.deps.Timeline == nil {
			if h.deps.History == nil {
				writeError(w, http.StatusInternalServerError, "timeline unavailable")
				return
			}
		}
		if h.deps.History != nil {
			id := parseTimelineID(r.URL.Path, "/components/")
			if id == "" {
				writeError(w, http.StatusNotFound, "component timeline not found")
				return
			}
			historyHandlers{deps: HistoryDependencies{Service: h.deps.History}}.handleTimeline(w, r, "component", id)
			return
		}
		id := parseTimelineID(r.URL.Path, "/components/")
		if id == "" {
			writeError(w, http.StatusNotFound, "component timeline not found")
			return
		}
		writeTimelineResponse(w, r, h.deps.Timeline, "component", id)
		return
	}

	if r.Method != http.MethodGet {
		w.WriteHeader(http.StatusMethodNotAllowed)
		return
	}

	id, ok := parseID(r.URL.Path, "/components/")
	if !ok {
		writeError(w, http.StatusNotFound, "component not found")
		return
	}

	item, err := h.deps.Components.Get(r.Context(), id)
	if err != nil {
		switch err {
		case registry.ErrNotFound:
			writeError(w, http.StatusNotFound, "component not found")
		default:
			writeError(w, http.StatusInternalServerError, "get component failed")
		}
		return
	}
	writeJSON(w, http.StatusOK, item)
}