package server

import (
	"context"
	"net/http"
	"strconv"
	"time"

	"gitea.meghsakha.com/platform/tenant-registry/internal/store"
)

type appendAuditReq struct {
	TenantID   string                 `json:"tenant_id,omitempty"`
	ProjectID  string                 `json:"project_id,omitempty"`
	ActorID    string                 `json:"actor_id,omitempty"`
	ActorName  string                 `json:"actor_name,omitempty"`
	ActorType  string                 `json:"actor_type,omitempty"`
	Action     string                 `json:"action"`
	TargetID   string                 `json:"target_id,omitempty"`
	TargetType string                 `json:"target_type,omitempty"`
	TargetName string                 `json:"target_name,omitempty"`
	Product    string                 `json:"product,omitempty"`
	Metadata   map[string]interface{} `json:"metadata,omitempty"`
}

func (s *Server) appendAudit(w http.ResponseWriter, r *http.Request) {
	var in appendAuditReq
	if !decodeJSON(w, r, &in) {
		return
	}
	if in.Action == "" {
		writeError(w, http.StatusBadRequest, "invalid_action", "action is required")
		return
	}

	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
	defer cancel()

	ev, err := s.Store.AppendAudit(ctx, store.AuditEvent{
		TenantID: in.TenantID, ProjectID: in.ProjectID,
		ActorID: in.ActorID, ActorName: in.ActorName, ActorType: in.ActorType,
		Action:   in.Action,
		TargetID: in.TargetID, TargetType: in.TargetType, TargetName: in.TargetName,
		Product: in.Product, Metadata: in.Metadata,
		SourceIP: clientIP(r), UserAgent: r.UserAgent(),
	})
	if err != nil {
		writeError(w, http.StatusInternalServerError, "internal", err.Error())
		return
	}
	writeJSON(w, http.StatusCreated, ev)
}

func (s *Server) listAudit(w http.ResponseWriter, r *http.Request) {
	q := r.URL.Query()
	f := store.AuditFilter{
		TenantID: q.Get("tenant_id"),
		Product:  q.Get("product"),
		ActorID:  q.Get("actor_id"),
		Action:   q.Get("action"),
	}
	if s := q.Get("since"); s != "" {
		t, err := time.Parse(time.RFC3339, s)
		if err != nil {
			writeError(w, http.StatusBadRequest, "invalid_since", "must be RFC3339")
			return
		}
		f.Since = &t
	}
	if s := q.Get("until"); s != "" {
		t, err := time.Parse(time.RFC3339, s)
		if err != nil {
			writeError(w, http.StatusBadRequest, "invalid_until", "must be RFC3339")
			return
		}
		f.Until = &t
	}
	if s := q.Get("limit"); s != "" {
		n, err := strconv.Atoi(s)
		if err != nil || n < 1 || n > 500 {
			writeError(w, http.StatusBadRequest, "invalid_limit", "must be 1..500")
			return
		}
		f.Limit = n
	}
	if s := q.Get("cursor"); s != "" {
		n, err := strconv.ParseInt(s, 10, 64)
		if err != nil {
			writeError(w, http.StatusBadRequest, "invalid_cursor", "must be an integer")
			return
		}
		f.Cursor = n
	}

	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
	defer cancel()
	items, next, err := s.Store.ListAudit(ctx, f)
	if err != nil {
		writeError(w, http.StatusInternalServerError, "internal", err.Error())
		return
	}
	out := map[string]any{"items": items}
	if next > 0 {
		out["next_cursor"] = next
	}
	writeJSON(w, http.StatusOK, out)
}