package store

import (
	"context"
	"fmt"

	"git.kundeng.us/phoenix/textsender-models/tx0/message"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
)

type MessageStore interface {
	GetMessageByID(ctx context.Context, id uuid.UUID) (*message.Message, error)
	CreateMessage(ctx context.Context, msg *message.Message) error
	GetAllMessages(ctx context.Context) ([]*message.Message, error)
	MessageExists(ctx context.Context, msg *message.Message) (bool, error)
}

type PGMessageStore struct {
	db *pgxpool.Pool
}

func NewMessageStore(db *pgxpool.Pool) *PGMessageStore {
	return &PGMessageStore{db: db}
}

func (m *PGMessageStore) CreateMessage(ctx context.Context, msg *message.Message) error {
	query := `
	INSERT INTO messages (content, user_id)
	VALUES ($1, $2)
	RETURNING id
	`

	return m.db.QueryRow(ctx, query, msg.Content, msg.UserId).Scan(
		&msg.Id,
	)
}

func (m *PGMessageStore) MessageExists(ctx context.Context, msg *message.Message) (bool, error) {
	query := `SELECT EXISTS(SELECT 1 FROM messages WHERE content = $1 AND user_id = $2)`

	var exists bool
	err := m.db.QueryRow(ctx, query, msg.Content, msg.UserId).Scan(&exists)
	if err != nil {
		return false, fmt.Errorf("checking if message exists: %w", err)
	} else {
		return exists, nil
	}
}

func (m *PGMessageStore) GetAllMessages(ctx context.Context) ([]*message.Message, error) {
	query := `SELECT id, content, user_id FROM messages`

	rows, err := m.db.Query(ctx, query)
	if err != nil {
		return nil, fmt.Errorf("querying all messages: %w", err)
	}
	defer rows.Close()

	var messages []*message.Message
	for rows.Next() {
		var msg message.Message
		if err := rows.Scan(
			&msg.Id, &msg.Content, &msg.UserId,
		); err != nil {
			return nil, fmt.Errorf("scanning message row: %w", err)
		}
		messages = append(messages, &msg)
	}

	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("iterating message rows: %w", err)
	}

	return messages, nil
}

func (m *PGMessageStore) GetMessageByID(ctx context.Context, id uuid.UUID) (*message.Message, error) {
	query := `SELECT id, content, user_id FROM messages WHERE id = $1`

	var msg message.Message
	err := m.db.QueryRow(ctx, query, id).Scan(
		&msg.Id, &msg.Content, &msg.UserId,
	)

	if err == pgx.ErrNoRows {
		return nil, nil
	}
	if err != nil {
		return nil, fmt.Errorf("getting message by ID: %w", err)
	}

	return &msg, nil
}