package server

import (
	"net/http"

	"task/internal/sqlite"
	"task/internal/ticket"
)

func (s *Server) handleProjectReport(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
	}
	groupBy := ticket.GroupBy(r.URL.Query().Get("groupBy"))
	if groupBy == "" {
		groupBy = ticket.GroupByTicket
	}
	valid := false
	for _, g := range ticket.AllGroupBys {
		if g == groupBy {
			valid = true
			break
		}
	}
	if !valid {
		writeError(w, http.StatusBadRequest, "invalid groupBy")
		return
	}

	entries, err := s.Times.ListByProject(id)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	tickets, err := s.Tickets.List(id)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	byID := make(map[string]ticket.Ticket, len(tickets))
	for _, t := range tickets {
		byID[t.ID] = t
	}
	rows := ticket.Aggregate(entries, byID, groupBy)
	total := ticket.TotalDuration(entries)

	type rowJSON struct {
		Key        string `json:"key"`
		Label      string `json:"label"`
		DurationNs int64  `json:"durationNs"`
	}
	out := make([]rowJSON, 0, len(rows))
	for _, row := range rows {
		out = append(out, rowJSON{
			Key:        row.Key,
			Label:      row.Label,
			DurationNs: int64(row.Duration),
		})
	}
	writeJSON(w, http.StatusOK, map[string]any{
		"groupBy":         groupBy,
		"totalDurationNs": int64(total),
		"rows":            out,
		"entryCount":      len(entries),
	})
}