package handlers

import (
	"encoding/json"
	"net/http"

	"github.com/go-chi/chi/v5"

	"task-dashboard/internal/models"
)

// HandleSettingsPage renders the settings page
func (h *Handler) HandleSettingsPage(w http.ResponseWriter, r *http.Request) {
	configs, _ := h.store.GetSourceConfigs()
	toggles, _ := h.store.GetFeatureToggles()

	// Group configs by source
	bySource := make(map[string][]models.SourceConfig)
	for _, cfg := range configs {
		bySource[cfg.Source] = append(bySource[cfg.Source], cfg)
	}

	data := struct {
		Configs  map[string][]models.SourceConfig
		Sources  []string
		Toggles  []models.FeatureToggle
	}{
		Configs: bySource,
		Sources: []string{"trello", "todoist", "gcal", "gtasks"},
		Toggles: toggles,
	}

	if err := h.renderer.Render(w, "settings.html", data); err != nil {
		JSONError(w, http.StatusInternalServerError, "Failed to render settings", err)
	}
}

// HandleSyncSources fetches available items from all sources and syncs to config
func (h *Handler) HandleSyncSources(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	// Sync Trello boards
	if h.trelloClient != nil {
		boards, err := h.trelloClient.GetBoards(ctx)
		if err == nil {
			var items []models.SourceConfig
			for _, b := range boards {
				items = append(items, models.SourceConfig{
					Source:   "trello",
					ItemType: "board",
					ItemID:   b.ID,
					ItemName: b.Name,
				})
			}
			_ = h.store.SyncSourceConfigs("trello", "board", items)
		}
	}

	// Sync Todoist projects
	if h.todoistClient != nil {
		projects, err := h.todoistClient.GetProjects(ctx)
		if err == nil {
			var items []models.SourceConfig
			for _, p := range projects {
				items = append(items, models.SourceConfig{
					Source:   "todoist",
					ItemType: "project",
					ItemID:   p.ID,
					ItemName: p.Name,
				})
			}
			_ = h.store.SyncSourceConfigs("todoist", "project", items)
		}
	}

	// Sync Google Calendar calendars
	if h.googleCalendarClient != nil {
		calendars, err := h.googleCalendarClient.GetCalendarList(ctx)
		if err == nil {
			var items []models.SourceConfig
			for _, c := range calendars {
				items = append(items, models.SourceConfig{
					Source:   "gcal",
					ItemType: "calendar",
					ItemID:   c.ID,
					ItemName: c.Name,
				})
			}
			_ = h.store.SyncSourceConfigs("gcal", "calendar", items)
		}
	}

	// Sync Google Tasks lists
	if h.googleTasksClient != nil {
		lists, err := h.googleTasksClient.GetTaskLists(ctx)
		if err == nil {
			var items []models.SourceConfig
			for _, l := range lists {
				items = append(items, models.SourceConfig{
					Source:   "gtasks",
					ItemType: "tasklist",
					ItemID:   l.ID,
					ItemName: l.Name,
				})
			}
			_ = h.store.SyncSourceConfigs("gtasks", "tasklist", items)
		}
	}

	// Return updated configs
	h.HandleSettingsPage(w, r)
}

// HandleToggleSourceConfig toggles a source config item
func (h *Handler) HandleToggleSourceConfig(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		JSONError(w, http.StatusBadRequest, "Failed to parse form", err)
		return
	}

	source := r.FormValue("source")
	itemType := r.FormValue("item_type")
	itemID := r.FormValue("item_id")
	enabled := r.FormValue("enabled") == "true"

	if source == "" || itemType == "" || itemID == "" {
		JSONError(w, http.StatusBadRequest, "Missing required fields", nil)
		return
	}

	if err := h.store.SetSourceConfigEnabled(source, itemType, itemID, enabled); err != nil {
		JSONError(w, http.StatusInternalServerError, "Failed to update config", err)
		return
	}

	// Invalidate relevant cache
	switch source {
	case "trello":
		_ = h.store.InvalidateCache("trello_boards")
	case "todoist":
		_ = h.store.InvalidateCache("todoist_tasks")
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]bool{"enabled": enabled})
}

// HandleGetSourceOptions returns available options for a source (HTMX partial)
func (h *Handler) HandleGetSourceOptions(w http.ResponseWriter, r *http.Request) {
	source := chi.URLParam(r, "source")
	if source == "" {
		JSONError(w, http.StatusBadRequest, "Source required", nil)
		return
	}

	configs, err := h.store.GetSourceConfigsBySource(source)
	if err != nil {
		JSONError(w, http.StatusInternalServerError, "Failed to load configs", err)
		return
	}

	data := struct {
		Source  string
		Configs []models.SourceConfig
	}{source, configs}

	HTMLResponse(w, h.renderer, "settings-source-options", data)
}

// HandleToggleFeature toggles a feature flag
func (h *Handler) HandleToggleFeature(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		JSONError(w, http.StatusBadRequest, "Failed to parse form", err)
		return
	}

	name := r.FormValue("name")
	enabled := r.FormValue("enabled") == "true"

	if name == "" {
		JSONError(w, http.StatusBadRequest, "Feature name required", nil)
		return
	}

	if err := h.store.SetFeatureEnabled(name, enabled); err != nil {
		JSONError(w, http.StatusInternalServerError, "Failed to update feature", err)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]bool{"enabled": enabled})
}

// HandleCreateFeature creates a new feature toggle
func (h *Handler) HandleCreateFeature(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		JSONError(w, http.StatusBadRequest, "Failed to parse form", err)
		return
	}

	name := r.FormValue("name")
	description := r.FormValue("description")

	if name == "" {
		JSONError(w, http.StatusBadRequest, "Feature name required", nil)
		return
	}

	if err := h.store.CreateFeatureToggle(name, description, false); err != nil {
		JSONError(w, http.StatusInternalServerError, "Failed to create feature", err)
		return
	}

	// Return updated toggles list
	h.HandleSettingsPage(w, r)
}

// HandleDeleteFeature removes a feature toggle
func (h *Handler) HandleDeleteFeature(w http.ResponseWriter, r *http.Request) {
	name := chi.URLParam(r, "name")
	if name == "" {
		JSONError(w, http.StatusBadRequest, "Feature name required", nil)
		return
	}

	if err := h.store.DeleteFeatureToggle(name); err != nil {
		JSONError(w, http.StatusInternalServerError, "Failed to delete feature", err)
		return
	}

	w.WriteHeader(http.StatusOK)
}