package postgres

import (
	"context"
	"database/sql"
	"encoding/json"

	"git.gobha.me/xcaliber/chat-switchboard/models"
	"git.gobha.me/xcaliber/chat-switchboard/store"
)

type AuditStore struct{}

func NewAuditStore() *AuditStore { return &AuditStore{} }

func (s *AuditStore) Log(ctx context.Context, entry *models.AuditEntry) error {
	metadataJSON := ToJSON(entry.Metadata)
	return DB.QueryRowContext(ctx, `
		INSERT INTO audit_log (actor_id, action, resource_type, resource_id, metadata, ip_address, user_agent)
		VALUES ($1, $2, $3, $4, $5, $6, $7)
		RETURNING id, created_at`,
		models.NullString(entry.ActorID), entry.Action, entry.ResourceType,
		entry.ResourceID, metadataJSON, entry.IPAddress, entry.UserAgent,
	).Scan(&entry.ID, &entry.CreatedAt)
}

func (s *AuditStore) List(ctx context.Context, opts store.AuditListOptions) ([]models.AuditEntry, int, error) {
	b := NewSelect("id, actor_id, action, resource_type, resource_id, metadata, ip_address, user_agent, created_at", "audit_log")

	if opts.ActorID != "" {
		b.Where("actor_id = ?", opts.ActorID)
	}
	if opts.Action != "" {
		b.Where("action = ?", opts.Action)
	}
	if opts.ResourceType != "" {
		b.Where("resource_type = ?", opts.ResourceType)
	}
	if opts.ResourceID != "" {
		b.Where("resource_id = ?", opts.ResourceID)
	}
	if opts.Since != nil {
		b.Where("created_at >= ?", *opts.Since)
	}
	if opts.Until != nil {
		b.Where("created_at <= ?", *opts.Until)
	}

	// Count
	countQ, countArgs := b.CountBuild()
	var total int
	DB.QueryRowContext(ctx, countQ, countArgs...).Scan(&total)

	// Results
	if opts.Sort == "" {
		b.OrderBy("created_at", "DESC")
	}
	b.Paginate(opts.ListOptions)

	q, args := b.Build()
	rows, err := DB.QueryContext(ctx, q, args...)
	if err != nil {
		return nil, 0, err
	}
	defer rows.Close()

	var result []models.AuditEntry
	for rows.Next() {
		var e models.AuditEntry
		var actorID sql.NullString
		var metadataJSON []byte
		err := rows.Scan(&e.ID, &actorID, &e.Action, &e.ResourceType, &e.ResourceID,
			&metadataJSON, &e.IPAddress, &e.UserAgent, &e.CreatedAt)
		if err != nil {
			return nil, 0, err
		}
		e.ActorID = NullableStringPtr(actorID)
		json.Unmarshal(metadataJSON, &e.Metadata)
		result = append(result, e)
	}
	return result, total, rows.Err()
}