package store

import (
	"database/sql"
	"errors"
	"fmt"

	"github.com/google/uuid"
)

// projectCols is the canonical column list for projects queries.
const projectCols = `id, name, registry, image, port, healthcheck, env, volumes,
	npm_access_list_id, webhook_secret, created_at, updated_at`

// CreateProject inserts a new project and returns it. A webhook secret is
// generated automatically if one is not already set on the input.
func (s *Store) CreateProject(p Project) (Project, error) {
	p.ID = uuid.New().String()
	p.CreatedAt = Now()
	p.UpdatedAt = p.CreatedAt
	if p.WebhookSecret == "" {
		p.WebhookSecret = uuid.New().String()
	}

	_, err := s.db.Exec(
		`INSERT INTO projects (`+projectCols+`)
		 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
		p.ID, p.Name, p.Registry, p.Image, p.Port, p.Healthcheck, p.Env, p.Volumes,
		p.NpmAccessListID, p.WebhookSecret, p.CreatedAt, p.UpdatedAt,
	)
	if err != nil {
		return Project{}, fmt.Errorf("insert project: %w", err)
	}
	return p, nil
}

// GetProjectByID returns a single project by its ID.
func (s *Store) GetProjectByID(id string) (Project, error) {
	var p Project
	err := s.db.QueryRow(
		`SELECT `+projectCols+` FROM projects WHERE id = ?`, id,
	).Scan(&p.ID, &p.Name, &p.Registry, &p.Image, &p.Port, &p.Healthcheck, &p.Env, &p.Volumes,
		&p.NpmAccessListID, &p.WebhookSecret, &p.CreatedAt, &p.UpdatedAt)
	if errors.Is(err, sql.ErrNoRows) {
		return Project{}, fmt.Errorf("project %s: %w", id, ErrNotFound)
	}
	if err != nil {
		return Project{}, fmt.Errorf("query project: %w", err)
	}
	return p, nil
}

// GetProjectByWebhookSecret looks up a project by its webhook secret.
// Returns ErrNotFound if no project has this secret (including empty).
func (s *Store) GetProjectByWebhookSecret(secret string) (Project, error) {
	if secret == "" {
		return Project{}, ErrNotFound
	}
	var p Project
	err := s.db.QueryRow(
		`SELECT `+projectCols+` FROM projects WHERE webhook_secret = ?`, secret,
	).Scan(&p.ID, &p.Name, &p.Registry, &p.Image, &p.Port, &p.Healthcheck, &p.Env, &p.Volumes,
		&p.NpmAccessListID, &p.WebhookSecret, &p.CreatedAt, &p.UpdatedAt)
	if errors.Is(err, sql.ErrNoRows) {
		return Project{}, ErrNotFound
	}
	if err != nil {
		return Project{}, fmt.Errorf("query project by webhook secret: %w", err)
	}
	return p, nil
}

// GetAllProjects returns every project ordered by name.
func (s *Store) GetAllProjects() ([]Project, error) {
	rows, err := s.db.Query(
		`SELECT ` + projectCols + ` FROM projects ORDER BY name`,
	)
	if err != nil {
		return nil, fmt.Errorf("query projects: %w", err)
	}
	defer rows.Close()

	projects := []Project{}
	for rows.Next() {
		var p Project
		if err := rows.Scan(&p.ID, &p.Name, &p.Registry, &p.Image, &p.Port, &p.Healthcheck, &p.Env, &p.Volumes,
			&p.NpmAccessListID, &p.WebhookSecret, &p.CreatedAt, &p.UpdatedAt); err != nil {
			return nil, fmt.Errorf("scan project: %w", err)
		}
		projects = append(projects, p)
	}
	return projects, rows.Err()
}

// GetProjectsByImage returns all projects using the given image, newest first.
func (s *Store) GetProjectsByImage(image string) ([]Project, error) {
	rows, err := s.db.Query(
		`SELECT `+projectCols+` FROM projects WHERE image = ? ORDER BY created_at DESC`, image,
	)
	if err != nil {
		return nil, fmt.Errorf("query projects by image: %w", err)
	}
	defer rows.Close()

	projects := []Project{}
	for rows.Next() {
		var p Project
		if err := rows.Scan(&p.ID, &p.Name, &p.Registry, &p.Image, &p.Port, &p.Healthcheck, &p.Env, &p.Volumes,
			&p.NpmAccessListID, &p.WebhookSecret, &p.CreatedAt, &p.UpdatedAt); err != nil {
			return nil, fmt.Errorf("scan project: %w", err)
		}
		projects = append(projects, p)
	}
	return projects, rows.Err()
}

// UpdateProject updates an existing project's mutable fields. Webhook secret
// is intentionally not updated here — use SetProjectWebhookSecret instead.
func (s *Store) UpdateProject(p Project) error {
	p.UpdatedAt = Now()
	result, err := s.db.Exec(
		`UPDATE projects SET name=?, registry=?, image=?, port=?, healthcheck=?, env=?, volumes=?,
		   npm_access_list_id=?, updated_at=?
		 WHERE id=?`,
		p.Name, p.Registry, p.Image, p.Port, p.Healthcheck, p.Env, p.Volumes,
		p.NpmAccessListID, p.UpdatedAt, p.ID,
	)
	if err != nil {
		return fmt.Errorf("update project: %w", err)
	}
	n, _ := result.RowsAffected()
	if n == 0 {
		return fmt.Errorf("project %s: %w", p.ID, ErrNotFound)
	}
	return nil
}

// SetProjectWebhookSecret assigns a webhook secret to a project.
// Pass an empty string to disable webhook access for the project.
func (s *Store) SetProjectWebhookSecret(id, secret string) error {
	result, err := s.db.Exec(
		`UPDATE projects SET webhook_secret=?, updated_at=? WHERE id=?`,
		secret, Now(), id,
	)
	if err != nil {
		return fmt.Errorf("set project webhook secret: %w", err)
	}
	n, _ := result.RowsAffected()
	if n == 0 {
		return fmt.Errorf("project %s: %w", id, ErrNotFound)
	}
	return nil
}

// EnsureProjectWebhookSecret returns the current webhook secret for a project,
// generating one on the fly if the stored value is empty (lazy backfill for
// projects created before the per-project webhook migration).
func (s *Store) EnsureProjectWebhookSecret(id string) (string, error) {
	project, err := s.GetProjectByID(id)
	if err != nil {
		return "", err
	}
	if project.WebhookSecret != "" {
		return project.WebhookSecret, nil
	}
	secret := uuid.New().String()
	if err := s.SetProjectWebhookSecret(id, secret); err != nil {
		return "", err
	}
	return secret, nil
}

// DeleteProject removes a project by ID. Cascading deletes handle stages, instances, and deploys.
func (s *Store) DeleteProject(id string) error {
	result, err := s.db.Exec(`DELETE FROM projects WHERE id = ?`, id)
	if err != nil {
		return fmt.Errorf("delete project: %w", err)
	}
	n, _ := result.RowsAffected()
	if n == 0 {
		return fmt.Errorf("project %s: %w", id, ErrNotFound)
	}
	return nil
}