package server

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

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

	"git.wntrmute.dev/mc/mcq/internal/db"
)

type putDocumentRequest struct {
	Title string `json:"title"`
	Body  string `json:"body"`
}

func listDocumentsHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, _ *http.Request) {
		docs, err := database.ListDocuments()
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to list documents")
			return
		}
		if docs == nil {
			docs = []db.Document{}
		}
		writeJSON(w, http.StatusOK, map[string]any{"documents": docs})
	}
}

func getDocumentHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		slug := chi.URLParam(r, "slug")
		doc, err := database.GetDocument(slug)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "document not found")
			return
		}
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to get document")
			return
		}
		writeJSON(w, http.StatusOK, doc)
	}
}

func putDocumentHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		slug := chi.URLParam(r, "slug")

		var req putDocumentRequest
		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			writeError(w, http.StatusBadRequest, "invalid request body")
			return
		}

		if req.Title == "" {
			writeError(w, http.StatusBadRequest, "title is required")
			return
		}
		if req.Body == "" {
			writeError(w, http.StatusBadRequest, "body is required")
			return
		}

		info := tokenInfoFromContext(r.Context())
		pushedBy := "unknown"
		if info != nil {
			pushedBy = info.Username
		}

		doc, err := database.PutDocument(slug, req.Title, req.Body, pushedBy)
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to save document")
			return
		}
		writeJSON(w, http.StatusOK, doc)
	}
}

func deleteDocumentHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		slug := chi.URLParam(r, "slug")

		err := database.DeleteDocument(slug)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "document not found")
			return
		}
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to delete document")
			return
		}
		w.WriteHeader(http.StatusNoContent)
	}
}

func markReadHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		slug := chi.URLParam(r, "slug")

		doc, err := database.MarkRead(slug)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "document not found")
			return
		}
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to mark read")
			return
		}
		writeJSON(w, http.StatusOK, doc)
	}
}

func markUnreadHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		slug := chi.URLParam(r, "slug")

		doc, err := database.MarkUnread(slug)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "document not found")
			return
		}
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to mark unread")
			return
		}
		writeJSON(w, http.StatusOK, doc)
	}
}