package server

import (
	"net/http"
	"strings"

	"task/internal/sqlite"
	"task/internal/syncbackend"
)

func (s *Server) handleGetSync(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if _, ok, code := s.requireProjectRole(id, sqlite.RoleViewer, r); !ok {
		writeError(w, code, "forbidden")
		return
	}
	b, err := s.Projects.GetSyncBackend(id)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, b)
}

func (s *Server) handlePutSync(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if _, ok, code := s.requireProjectRole(id, sqlite.RoleAdmin, r); !ok {
		writeError(w, code, "forbidden")
		return
	}
	var body sqlite.SyncBackend
	if err := readJSON(r, &body); err != nil {
		writeError(w, http.StatusBadRequest, "invalid json")
		return
	}
	body.ProjectID = id
	if body.Kind == "" {
		body.Kind = "none"
	}
	if err := s.Projects.SetSyncBackend(body); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, body)
}

func (s *Server) projectSyncConfig(projectID string) (syncbackend.ProjectConfig, error) {
	b, err := s.Projects.GetSyncBackend(projectID)
	if err != nil {
		return syncbackend.ProjectConfig{}, err
	}
	cfg := syncbackend.ProjectConfig{
		Kind:       b.Kind,
		BaseURL:    b.BaseURL,
		ProjectKey: b.ProjectKey,
		Query:      b.Query,
	}
	if b.ConnectionID != "" {
		conn, err := s.DB.GetConnection(b.ConnectionID)
		if err != nil {
			return cfg, err
		}
		cfg.Token = conn.Token
		if cfg.BaseURL == "" {
			cfg.BaseURL = conn.BaseURL
		}
	}
	return cfg, nil
}

func (s *Server) handleSyncPull(w http.ResponseWriter, r *http.Request) {
	s.runSync(w, r, true)
}

func (s *Server) handleSyncPush(w http.ResponseWriter, r *http.Request) {
	s.runSync(w, r, false)
}

func (s *Server) runSync(w http.ResponseWriter, r *http.Request, pull bool) {
	id := r.PathValue("id")
	u, ok, code := s.requireProjectRole(id, sqlite.RoleMember, r)
	if !ok {
		writeError(w, code, "forbidden")
		return
	}
	cfg, err := s.projectSyncConfig(id)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	backend, err := s.Sync.Get(cfg.Kind)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	var res syncbackend.Result
	if pull {
		res, err = backend.Pull(r.Context(), id, cfg, s.Tickets, s.Times)
	} else {
		res, err = backend.Push(r.Context(), id, cfg, s.Tickets, s.Times)
	}
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	op := "sync_push"
	if pull {
		op = "sync_pull"
	}
	tickets, _ := s.Tickets.List(id)
	for _, t := range tickets {
		_, _ = s.DB.AppendRevision("ticket", t.ID, id, op, u.ID, t)
	}
	writeJSON(w, http.StatusOK, res)
}

func (s *Server) handleListConnections(w http.ResponseWriter, r *http.Request) {
	list, err := s.DB.ListConnections()
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, list)
}

func (s *Server) handleCreateConnection(w http.ResponseWriter, r *http.Request) {
	u, _ := s.currentUser(r)
	var body struct {
		Name    string `json:"name"`
		Kind    string `json:"kind"`
		BaseURL string `json:"baseUrl"`
		Scope   string `json:"scope"`
		Token   string `json:"token"`
	}
	if err := readJSON(r, &body); err != nil {
		writeError(w, http.StatusBadRequest, "invalid json")
		return
	}
	if body.Kind == "" {
		body.Kind = "youtrack"
	}
	c, err := s.DB.CreateConnection(body.Name, body.Kind, body.BaseURL, body.Scope, body.Token, u.ID)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	writeJSON(w, http.StatusCreated, c)
}

func (s *Server) handleDeleteConnection(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.DB.DeleteConnection(id); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
}

func (s *Server) handleConnectionProjects(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	conn, err := s.DB.GetConnection(id)
	if err != nil {
		writeError(w, http.StatusNotFound, err.Error())
		return
	}
	backend, err := s.Sync.Get(conn.Kind)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	projects, err := backend.ListProjects(r.Context(), syncbackend.Connection{
		Kind: conn.Kind, BaseURL: conn.BaseURL, Token: conn.Token, Scope: conn.Scope,
	})
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, projects)
}

func (s *Server) handleImportProject(w http.ResponseWriter, r *http.Request) {
	u, _ := s.currentUser(r)
	connID := r.PathValue("id")
	var body struct {
		RemoteKey string `json:"remoteKey"`
		LocalID   string `json:"localId"`
		Name      string `json:"name"`
		Pull      bool   `json:"pull"`
	}
	if err := readJSON(r, &body); err != nil {
		writeError(w, http.StatusBadRequest, "invalid json")
		return
	}
	body.RemoteKey = strings.TrimSpace(body.RemoteKey)
	if body.RemoteKey == "" {
		writeError(w, http.StatusBadRequest, "remoteKey required")
		return
	}
	conn, err := s.DB.GetConnection(connID)
	if err != nil {
		writeError(w, http.StatusNotFound, err.Error())
		return
	}
	name := body.Name
	if name == "" {
		name = body.RemoteKey
	}
	// LocalID optional; empty → auto UUID. Explicit id only for advanced clients.
	p, err := s.Projects.Create(strings.TrimSpace(body.LocalID), name)
	if err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}
	_ = s.DB.SetMember(p.ID, u.ID, sqlite.RoleOwner)
	_ = s.Projects.SetSyncBackend(sqlite.SyncBackend{
		ProjectID:    p.ID,
		Kind:         conn.Kind,
		BaseURL:      conn.BaseURL,
		ProjectKey:   body.RemoteKey,
		ConnectionID: conn.ID,
	})
	result := map[string]any{"project": p}
	if body.Pull {
		cfg, err := s.projectSyncConfig(p.ID)
		if err == nil {
			if backend, err := s.Sync.Get(cfg.Kind); err == nil {
				res, err := backend.Pull(r.Context(), p.ID, cfg, s.Tickets, s.Times)
				if err != nil {
					result["pullError"] = err.Error()
				} else {
					result["pull"] = res
				}
			}
		}
	}
	writeJSON(w, http.StatusCreated, result)
}