package db

import (
	"context"
	"encoding/json"
	"fmt"

	"cloudipvalidator/internal/config"
)

// BootstrapFromConfig ensures the database's baseline state matches the
// YAML config on a fresh install, then gets out of the way.
//
//   - ip_addresses -> SeedQueue: unchanged, always additive. This is a
//     separate concept from the runtime admin queue API (SubmitIPs) — every
//     control-api startup re-adds any address from cfg.IPAddresses that
//     isn't already in the queue.
//   - validators / sites / target_groups / check_types: applied from YAML
//     only if the corresponding table is currently empty. Once any row
//     exists (via this bootstrap or the admin API), YAML for that section
//     is ignored on every subsequent startup — the database is the source
//     of truth from that point on. This is what makes admin API changes to
//     these four entities survive a restart.
func (d *DB) BootstrapFromConfig(ctx context.Context, cfg *config.ControlAPI) error {
	if err := d.bootstrapValidators(ctx, cfg.Validators); err != nil {
		return fmt.Errorf("bootstrap validators: %w", err)
	}
	if err := d.bootstrapSites(ctx, cfg.Sites); err != nil {
		return fmt.Errorf("bootstrap sites: %w", err)
	}
	if err := d.bootstrapTargetGroups(ctx, cfg.Targets); err != nil {
		return fmt.Errorf("bootstrap target groups: %w", err)
	}
	if err := d.bootstrapCheckTypes(ctx, cfg.CheckTypes); err != nil {
		return fmt.Errorf("bootstrap check types: %w", err)
	}
	if err := d.bootstrapSettings(ctx, cfg.Orchestrator.FIPSettleSeconds); err != nil {
		return fmt.Errorf("bootstrap settings: %w", err)
	}
	if err := d.bootstrapInboundChecks(ctx, cfg.Inbound.Ports, cfg.Inbound.ICMP); err != nil {
		return fmt.Errorf("bootstrap inbound checks: %w", err)
	}
	if err := d.SeedQueue(ctx, cfg.IPAddresses); err != nil {
		return fmt.Errorf("seed ip queue: %w", err)
	}
	return nil
}

func (d *DB) bootstrapValidators(ctx context.Context, validators []config.ValidatorConfig) error {
	var count int
	if err := d.QueryRowContext(ctx, `SELECT COUNT(*) FROM validators`).Scan(&count); err != nil {
		return err
	}
	if count > 0 {
		return nil
	}
	for _, v := range validators {
		if err := d.RegisterValidator(ctx, v.ValidatorID, "", v.OSPortID, ""); err != nil {
			return fmt.Errorf("seed validator %s: %w", v.ValidatorID, err)
		}
	}
	return nil
}

func (d *DB) bootstrapSites(ctx context.Context, sites []config.SiteConfig) error {
	var count int
	if err := d.QueryRowContext(ctx, `SELECT COUNT(*) FROM sites`).Scan(&count); err != nil {
		return err
	}
	if count > 0 {
		return nil
	}
	for _, s := range sites {
		if err := d.UpsertSite(ctx, s.Index, s.SiteID); err != nil {
			return fmt.Errorf("seed site %s: %w", s.SiteID, err)
		}
	}
	return nil
}

func (d *DB) bootstrapTargetGroups(ctx context.Context, targets map[string][]string) error {
	var count int
	if err := d.QueryRowContext(ctx, `SELECT COUNT(*) FROM target_groups`).Scan(&count); err != nil {
		return err
	}
	if count > 0 {
		return nil
	}
	for name, addrs := range targets {
		if err := d.UpsertTargetGroup(ctx, name, addrs); err != nil {
			return fmt.Errorf("seed target group %s: %w", name, err)
		}
	}
	return nil
}

func (d *DB) bootstrapCheckTypes(ctx context.Context, checkTypes []config.CheckTypeConfig) error {
	var count int
	if err := d.QueryRowContext(ctx, `SELECT COUNT(*) FROM check_types`).Scan(&count); err != nil {
		return err
	}
	if count > 0 {
		return nil
	}
	for _, ct := range checkTypes {
		if err := d.UpsertCheckType(ctx, ct.Name, ct.Enabled, ct.Targets); err != nil {
			return fmt.Errorf("seed check type %s: %w", ct.Name, err)
		}
	}
	return nil
}

func (d *DB) bootstrapSettings(ctx context.Context, fipSettleSeconds int) error {
	var count int
	if err := d.QueryRowContext(ctx, `SELECT COUNT(*) FROM settings`).Scan(&count); err != nil {
		return err
	}
	if count > 0 {
		return nil
	}
	now := timeToDB(Now())
	_, err := d.ExecContext(ctx, `
		INSERT INTO settings (id, fip_settle_seconds, created_at, updated_at) VALUES (1, ?, ?, ?)
	`, fipSettleSeconds, now, now)
	return err
}

func (d *DB) bootstrapInboundChecks(ctx context.Context, ports []int, icmp bool) error {
	var count int
	if err := d.QueryRowContext(ctx, `SELECT COUNT(*) FROM inbound_checks_settings`).Scan(&count); err != nil {
		return err
	}
	if count > 0 {
		return nil
	}
	if ports == nil {
		ports = []int{}
	}
	payload, err := json.Marshal(ports)
	if err != nil {
		return err
	}
	now := timeToDB(Now())
	_, err = d.ExecContext(ctx, `
		INSERT INTO inbound_checks_settings (id, ports, icmp, created_at, updated_at) VALUES (1, ?, ?, ?, ?)
	`, string(payload), icmp, now, now)
	return err
}