package main

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"time"

	_ "github.com/mattn/go-sqlite3"
)

// DeployTarget represents a deploy configuration stored in operations.db.
type DeployTarget struct {
	App          string            `json:"app"`
	Host         string            `json:"host"` // SSH alias from ~/.ssh/config
	RemoteDir    string            `json:"remote_dir"`
	BinaryName   string            `json:"binary_name"`
	BuildCmd     string            `json:"build_cmd"`
	ServiceUser  string            `json:"service_user"`
	Port         int               `json:"port"`
	HealthPath   string            `json:"health_path"`
	Env          map[string]string `json:"env"`
	Strategy     string            `json:"strategy"`      // "systemd" (default), "systemd-remote", "docker-compose"
	SourceDir    string            `json:"source_dir"`    // override for appDir(); empty = use default apps/<app>
	Branch       string            `json:"branch"`        // git branch for remote deploys; default "main"
	ComposeFiles string            `json:"compose_files"` // comma-separated extra compose files
	CreatedAt    time.Time         `json:"created_at"`
}

// DeployLog records a deploy execution.
type DeployLog struct {
	ID        int64     `json:"id"`
	App       string    `json:"app"`
	Host      string    `json:"host"`
	Status    string    `json:"status"` // "success", "failure"
	Trigger   string    `json:"trigger"` // "manual", "webhook"
	Error     string    `json:"error"`
	Duration  int64     `json:"duration_ms"`
	StartedAt time.Time `json:"started_at"`
}

// Store manages the deploy_server's SQLite database.
type Store struct {
	db *sql.DB
}

func OpenStore(path string) (*Store, error) {
	db, err := sql.Open("sqlite3", path+"?_journal_mode=WAL&_busy_timeout=5000")
	if err != nil {
		return nil, err
	}
	s := &Store{db: db}
	if err := s.migrate(); err != nil {
		db.Close()
		return nil, err
	}
	return s, nil
}

func (s *Store) Close() error {
	return s.db.Close()
}

func (s *Store) migrate() error {
	_, err := s.db.Exec(`
		CREATE TABLE IF NOT EXISTS deploy_targets (
			app           TEXT NOT NULL,
			host          TEXT NOT NULL,
			remote_dir    TEXT NOT NULL DEFAULT '',
			binary_name   TEXT NOT NULL DEFAULT '',
			build_cmd     TEXT NOT NULL DEFAULT '',
			service_user  TEXT NOT NULL DEFAULT '',
			port          INTEGER NOT NULL DEFAULT 0,
			health_path   TEXT NOT NULL DEFAULT '',
			env           TEXT NOT NULL DEFAULT '{}',
			strategy      TEXT NOT NULL DEFAULT 'systemd',
			source_dir    TEXT NOT NULL DEFAULT '',
			branch        TEXT NOT NULL DEFAULT 'main',
			compose_files TEXT NOT NULL DEFAULT '',
			created_at    TEXT NOT NULL,
			PRIMARY KEY (app, host)
		);
		CREATE TABLE IF NOT EXISTS deploy_logs (
			id         INTEGER PRIMARY KEY AUTOINCREMENT,
			app        TEXT NOT NULL,
			host       TEXT NOT NULL,
			status     TEXT NOT NULL,
			trigger    TEXT NOT NULL DEFAULT 'manual',
			error      TEXT NOT NULL DEFAULT '',
			duration_ms INTEGER NOT NULL DEFAULT 0,
			started_at TEXT NOT NULL
		);
	`)
	if err != nil {
		return err
	}
	// Idempotent column additions for existing databases
	for _, col := range []string{
		"ALTER TABLE deploy_targets ADD COLUMN strategy TEXT NOT NULL DEFAULT 'systemd'",
		"ALTER TABLE deploy_targets ADD COLUMN source_dir TEXT NOT NULL DEFAULT ''",
		"ALTER TABLE deploy_targets ADD COLUMN branch TEXT NOT NULL DEFAULT 'main'",
		"ALTER TABLE deploy_targets ADD COLUMN compose_files TEXT NOT NULL DEFAULT ''",
	} {
		s.db.Exec(col) // ignore "duplicate column" errors
	}
	return nil
}

func (s *Store) AddTarget(t DeployTarget) error {
	envJSON, _ := json.Marshal(t.Env)
	if t.Strategy == "" {
		t.Strategy = "systemd"
	}
	if t.Branch == "" {
		t.Branch = "main"
	}
	_, err := s.db.Exec(`
		INSERT OR REPLACE INTO deploy_targets (app, host, remote_dir, binary_name, build_cmd, service_user, port, health_path, env, strategy, source_dir, branch, compose_files, created_at)
		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
		t.App, t.Host, t.RemoteDir, t.BinaryName, t.BuildCmd, t.ServiceUser, t.Port, t.HealthPath,
		string(envJSON), t.Strategy, t.SourceDir, t.Branch, t.ComposeFiles,
		time.Now().UTC().Format(time.RFC3339))
	return err
}

func (s *Store) RemoveTarget(app string) error {
	res, err := s.db.Exec("DELETE FROM deploy_targets WHERE app = ?", app)
	if err != nil {
		return err
	}
	n, _ := res.RowsAffected()
	if n == 0 {
		return fmt.Errorf("target %q not found", app)
	}
	return nil
}

const selectTargetCols = "app, host, remote_dir, binary_name, build_cmd, service_user, port, health_path, env, strategy, source_dir, branch, compose_files, created_at"

func (s *Store) GetTargets(app string) ([]DeployTarget, error) {
	rows, err := s.db.Query("SELECT "+selectTargetCols+" FROM deploy_targets WHERE app = ?", app)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	return scanTargets(rows)
}

func (s *Store) ListTargets() ([]DeployTarget, error) {
	rows, err := s.db.Query("SELECT "+selectTargetCols+" FROM deploy_targets ORDER BY app, host")
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	return scanTargets(rows)
}

func scanTargets(rows *sql.Rows) ([]DeployTarget, error) {
	var targets []DeployTarget
	for rows.Next() {
		var t DeployTarget
		var envStr, createdStr string
		if err := rows.Scan(&t.App, &t.Host, &t.RemoteDir, &t.BinaryName, &t.BuildCmd, &t.ServiceUser, &t.Port, &t.HealthPath, &envStr, &t.Strategy, &t.SourceDir, &t.Branch, &t.ComposeFiles, &createdStr); err != nil {
			return nil, err
		}
		json.Unmarshal([]byte(envStr), &t.Env)
		t.CreatedAt, _ = time.Parse(time.RFC3339, createdStr)
		targets = append(targets, t)
	}
	return targets, rows.Err()
}

func (s *Store) LogDeploy(l DeployLog) error {
	_, err := s.db.Exec(`
		INSERT INTO deploy_logs (app, host, status, trigger, error, duration_ms, started_at)
		VALUES (?, ?, ?, ?, ?, ?, ?)`,
		l.App, l.Host, l.Status, l.Trigger, l.Error, l.Duration, l.StartedAt.UTC().Format(time.RFC3339))
	return err
}

func (s *Store) RecentLogs(app string, limit int) ([]DeployLog, error) {
	query := "SELECT id, app, host, status, trigger, error, duration_ms, started_at FROM deploy_logs"
	var args []any
	if app != "" {
		query += " WHERE app = ?"
		args = append(args, app)
	}
	query += " ORDER BY started_at DESC LIMIT ?"
	args = append(args, limit)

	rows, err := s.db.Query(query, args...)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var logs []DeployLog
	for rows.Next() {
		var l DeployLog
		var startedStr string
		if err := rows.Scan(&l.ID, &l.App, &l.Host, &l.Status, &l.Trigger, &l.Error, &l.Duration, &startedStr); err != nil {
			return nil, err
		}
		l.StartedAt, _ = time.Parse(time.RFC3339, startedStr)
		logs = append(logs, l)
	}
	return logs, rows.Err()
}