package db

import (
	"context"
	"database/sql"
	"fmt"

	_ "modernc.org/sqlite"
)

func Open(path string) (*sql.DB, error) {
	db, err := sql.Open("sqlite", path+"?_journal=WAL&_timeout=5000&_fk=true")
	if err != nil {
		return nil, err
	}
	db.SetMaxOpenConns(1) // SQLite is single-writer
	if err := migrate(db); err != nil {
		db.Close()
		return nil, fmt.Errorf("migrate: %w", err)
	}
	return db, nil
}

func migrate(db *sql.DB) error {
	ctx := context.Background()
	if _, err := db.ExecContext(ctx, `CREATE TABLE IF NOT EXISTS schema_version (version INTEGER NOT NULL)`); err != nil {
		return err
	}
	var version int
	db.QueryRowContext(ctx, `SELECT COALESCE(MAX(version),0) FROM schema_version`).Scan(&version) //nolint

	migrations := []string{
		// v1: core schema
		`CREATE TABLE IF NOT EXISTS tickets (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			ticket_number INTEGER NOT NULL,
			user_id TEXT NOT NULL,
			panel TEXT NOT NULL,
			type TEXT NOT NULL,
			channel_id TEXT NOT NULL UNIQUE,
			opened_at DATETIME NOT NULL,
			claimed_by TEXT,
			claimed_at DATETIME,
			closed_at DATETIME,
			closed_by TEXT,
			reason TEXT,
			transcript_path TEXT,
			status TEXT NOT NULL DEFAULT 'open'
		);
		CREATE INDEX IF NOT EXISTS idx_tickets_user ON tickets(user_id);
		CREATE INDEX IF NOT EXISTS idx_tickets_status ON tickets(status);
		CREATE INDEX IF NOT EXISTS idx_tickets_type ON tickets(type);
		CREATE TABLE IF NOT EXISTS claim_messages (
			ticket_id INTEGER PRIMARY KEY,
			message_id TEXT NOT NULL,
			last_reup_at DATETIME NOT NULL
		);
		CREATE TABLE IF NOT EXISTS convocation_counter (
			id INTEGER PRIMARY KEY CHECK(id=1),
			count INTEGER NOT NULL DEFAULT 0
		);
		INSERT OR IGNORE INTO convocation_counter(id,count) VALUES(1,0);`,
		// v2: user-supplied ticket title and description (from modal)
		`ALTER TABLE tickets ADD COLUMN ticket_title TEXT;
		ALTER TABLE tickets ADD COLUMN ticket_description TEXT;`,
		// v3: panel web admin tables
		`CREATE TABLE IF NOT EXISTS panel_admins (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			discord_id TEXT NOT NULL UNIQUE,
			discord_username TEXT NOT NULL DEFAULT '',
			discord_avatar TEXT NOT NULL DEFAULT '',
			password_hash TEXT NOT NULL,
			totp_secret TEXT,
			totp_enabled INTEGER NOT NULL DEFAULT 0,
			is_superadmin INTEGER NOT NULL DEFAULT 0,
			created_at DATETIME NOT NULL,
			updated_at DATETIME NOT NULL
		);
		CREATE TABLE IF NOT EXISTS panel_sessions (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			token TEXT NOT NULL UNIQUE,
			csrf_token TEXT NOT NULL,
			admin_id INTEGER NOT NULL REFERENCES panel_admins(id) ON DELETE CASCADE,
			ip_address TEXT NOT NULL DEFAULT '',
			user_agent TEXT NOT NULL DEFAULT '',
			last_activity DATETIME NOT NULL,
			created_at DATETIME NOT NULL
		);
		CREATE INDEX IF NOT EXISTS idx_sessions_token ON panel_sessions(token);
		CREATE TABLE IF NOT EXISTS panel_configs (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			name TEXT NOT NULL UNIQUE,
			embed_title TEXT NOT NULL DEFAULT '',
			embed_description TEXT,
			embed_color TEXT NOT NULL DEFAULT '#5865f2',
			guild_id TEXT NOT NULL DEFAULT '',
			channel_id TEXT,
			message_id TEXT,
			sort_order INTEGER NOT NULL DEFAULT 0,
			created_at DATETIME NOT NULL,
			updated_at DATETIME NOT NULL
		);
		CREATE TABLE IF NOT EXISTS panel_types (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			panel_id INTEGER NOT NULL REFERENCES panel_configs(id) ON DELETE CASCADE,
			name TEXT NOT NULL,
			button_label TEXT NOT NULL DEFAULT '',
			button_color TEXT NOT NULL DEFAULT 'primary',
			button_emoji TEXT NOT NULL DEFAULT '',
			embed_color TEXT NOT NULL DEFAULT '#5865f2',
			embed_title TEXT NOT NULL DEFAULT '',
			embed_text TEXT NOT NULL DEFAULT '',
			staff_role_id TEXT NOT NULL DEFAULT '',
			category_id TEXT NOT NULL DEFAULT '',
			claim_channel_id TEXT NOT NULL DEFAULT '',
			log_channel_id TEXT NOT NULL DEFAULT '',
			max_per_user INTEGER NOT NULL DEFAULT 1,
			claim_mode INTEGER NOT NULL DEFAULT 1,
			close_rule TEXT NOT NULL DEFAULT 'staff_only',
			modal_enabled INTEGER NOT NULL DEFAULT 1,
			sort_order INTEGER NOT NULL DEFAULT 0,
			created_at DATETIME NOT NULL,
			updated_at DATETIME NOT NULL,
			UNIQUE(panel_id, name)
		);
		CREATE TABLE IF NOT EXISTS convocation_config (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			guild_id TEXT NOT NULL UNIQUE,
			category_id TEXT NOT NULL DEFAULT '',
			log_channel_id TEXT NOT NULL DEFAULT '',
			modal_enabled INTEGER NOT NULL DEFAULT 1,
			updated_at DATETIME NOT NULL
		);
		CREATE TABLE IF NOT EXISTS audit_log (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			admin_id INTEGER NOT NULL REFERENCES panel_admins(id),
			action TEXT NOT NULL,
			entity_type TEXT NOT NULL,
			entity_id INTEGER,
			old_value TEXT,
			new_value TEXT,
			ip_address TEXT NOT NULL DEFAULT '',
			created_at DATETIME NOT NULL
		);
		CREATE INDEX IF NOT EXISTS idx_audit_admin ON audit_log(admin_id);
		CREATE INDEX IF NOT EXISTS idx_audit_entity ON audit_log(entity_type, entity_id);
		CREATE TABLE IF NOT EXISTS user_blacklist (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			discord_id TEXT NOT NULL UNIQUE,
			reason TEXT,
			blacklisted_by TEXT NOT NULL DEFAULT '',
			created_at DATETIME NOT NULL
		);`,
	}

	migrations = append(migrations,
		// v4: embed image fields on panel_types
		`ALTER TABLE panel_types ADD COLUMN thumbnail_url TEXT NOT NULL DEFAULT '';
		 ALTER TABLE panel_types ADD COLUMN image_url TEXT NOT NULL DEFAULT '';`,
		// v5: embed image/thumbnail on panel_configs (panel-level)
		`ALTER TABLE panel_configs ADD COLUMN embed_image TEXT NOT NULL DEFAULT '';
		 ALTER TABLE panel_configs ADD COLUMN embed_thumbnail TEXT NOT NULL DEFAULT '';`,
		// v6: per-ticket guild + channel routing + convoc panel config
		`ALTER TABLE tickets ADD COLUMN guild_id TEXT NOT NULL DEFAULT '';
		 ALTER TABLE tickets ADD COLUMN claim_channel_id TEXT NOT NULL DEFAULT '';
		 ALTER TABLE tickets ADD COLUMN log_channel_id TEXT NOT NULL DEFAULT '';
		 ALTER TABLE convocation_config ADD COLUMN panel_channel_id TEXT NOT NULL DEFAULT '';
		 ALTER TABLE convocation_config ADD COLUMN panel_message_id TEXT NOT NULL DEFAULT '';
		 ALTER TABLE convocation_config ADD COLUMN panel_embed_title TEXT NOT NULL DEFAULT 'Créer une convocation';
		 ALTER TABLE convocation_config ADD COLUMN panel_embed_description TEXT NOT NULL DEFAULT '';
		 ALTER TABLE convocation_config ADD COLUMN panel_embed_color TEXT NOT NULL DEFAULT '#5865f2';`,
		// v7: per-ticket staff role + reup time, per-type reup time, convocation panels table
		`ALTER TABLE tickets ADD COLUMN staff_role_id TEXT NOT NULL DEFAULT '';
		 ALTER TABLE tickets ADD COLUMN claim_reup_minutes INTEGER NOT NULL DEFAULT 0;
		 ALTER TABLE panel_types ADD COLUMN claim_reup_minutes INTEGER NOT NULL DEFAULT 0;
		 CREATE TABLE IF NOT EXISTS convocation_panels (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			guild_id TEXT NOT NULL,
			embed_title TEXT NOT NULL DEFAULT 'Créer une convocation',
			embed_description TEXT NOT NULL DEFAULT '',
			embed_color TEXT NOT NULL DEFAULT '#5865f2',
			channel_id TEXT NOT NULL DEFAULT '',
			message_id TEXT NOT NULL DEFAULT '',
			created_at DATETIME NOT NULL,
			updated_at DATETIME NOT NULL
		 );
		 CREATE INDEX IF NOT EXISTS idx_convoc_panels_guild ON convocation_panels(guild_id);`,
	)

	for i, m := range migrations {
		v := i + 1
		if v <= version {
			continue
		}
		if _, err := db.ExecContext(ctx, m); err != nil {
			return fmt.Errorf("migration v%d: %w", v, err)
		}
		if _, err := db.ExecContext(ctx, `INSERT INTO schema_version(version) VALUES(?)`, v); err != nil {
			return fmt.Errorf("record migration v%d: %w", v, err)
		}
	}
	return nil
}