package catalog

import (
	"context"
	"fmt"

	"github.com/descrybe/descrybe-v2/apps/api/internal/billing"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgxpool"
)

// EnsureCategoryAttributeLinks removes orphan category_attributes rows (missing
// category or attribute) without wiping taxonomy or valid links. Returns orphans
// removed and remaining link count.
func EnsureCategoryAttributeLinks(ctx context.Context, pool *pgxpool.Pool, companyID uuid.UUID) (orphansRemoved int, links int, err error) {
	if pool == nil {
		return 0, 0, fmt.Errorf("nil pool")
	}
	ct, err := pool.Exec(ctx, `
		DELETE FROM category_attributes ca
		WHERE ca.company_id = $1
		  AND (
		    NOT EXISTS (
		      SELECT 1 FROM categories c
		      WHERE c.company_id = ca.company_id AND c.unique_id = ca.category_unique_id
		    )
		    OR NOT EXISTS (
		      SELECT 1 FROM attributes a
		      WHERE a.id = ca.attribute_id AND a.company_id = ca.company_id
		    )
		  )`, companyID)
	if err != nil {
		return 0, 0, fmt.Errorf("purge orphan category_attributes: %w", err)
	}
	orphansRemoved = int(ct.RowsAffected())
	if err := pool.QueryRow(ctx, `
		SELECT count(*)::int FROM category_attributes WHERE company_id = $1`, companyID).Scan(&links); err != nil {
		return orphansRemoved, 0, err
	}
	return orphansRemoved, links, nil
}

// RepairCompanyCategoryEnhancePrompts is the company-scoped variant of
// RepairA1DemoCategoryEnhancePrompts: loads wp_product_categories.sql when
// available (upload bytes, SEED_A1_WP_CATEGORIES / Downloads), else
// a1-category-prompts.json, splits legacy combined overlays into role sections,
// and force-applies WP dump matches. Falls back to CategoryEnhanceUserTemplate.
// Idempotent when unchanged.
func RepairCompanyCategoryEnhancePrompts(ctx context.Context, pool *pgxpool.Pool, companyID uuid.UUID) (updated, alreadyOK, emptySkipped int, err error) {
	res, err := RepairCompanyCategoryEnhancePromptsWithOptions(ctx, pool, companyID, RepairA1DemoOptions{})
	if err != nil {
		return 0, 0, 0, err
	}
	return res.Updated, res.AlreadyOK, res.EmptySkipped, nil
}

// RepairCompanyCategoryEnhancePromptsWithOptions applies category enhance prompt
// repair for one company. Pass WPCategoriesSQL to force-apply an uploaded dump
// (Admin Sync A1); empty opts keep auto-detect fallback.
func RepairCompanyCategoryEnhancePromptsWithOptions(ctx context.Context, pool *pgxpool.Pool, companyID uuid.UUID, opts RepairA1DemoOptions) (RepairCategoryEnhancePromptsResult, error) {
	out := RepairCategoryEnhancePromptsResult{
		ByCompany: map[string]int{},
	}
	if pool == nil {
		return out, fmt.Errorf("nil pool")
	}
	if len(opts.WPCategoriesSQL) > 0 {
		if _, _, err := LoadWPCategoryPromptOverlaysFromBytes(opts.WPCategoriesSQL); err != nil {
			return out, fmt.Errorf("wp_product_categories upload: %w", err)
		}
	}
	seedByNorm, seedByUID, seedMeta := resolveCategoryPromptOverlays(opts)
	out.SeedPath = seedMeta.Path
	out.WPCategoriesPath = seedMeta.WPPath
	out.SeedEntries = seedMeta.Entries
	forceFromSeed := seedMeta.ForceFromSeed
	if opts.ForceFromSeed != nil {
		forceFromSeed = *opts.ForceFromSeed
	}
	if _, err := repairCompanyCategoryEnhancePrompts(ctx, pool, companyID, companyID.String(), seedByNorm, seedByUID, false, forceFromSeed, &out); err != nil {
		return out, err
	}
	return out, nil
}

// ResolvePlatformDemoCompanyID finds the Platform Demo sandbox (never A1 cohort).
func ResolvePlatformDemoCompanyID(ctx context.Context, pool *pgxpool.Pool) (uuid.UUID, error) {
	var id uuid.UUID
	err := pool.QueryRow(ctx, `
		SELECT c.id
		FROM companies c
		WHERE c.name = $1
		  AND COALESCE(c.legacy_company_id, '') <> $2
		ORDER BY c.created_at ASC
		LIMIT 1`, platformDemoCompanyName, billing.A1LegacyCompanyID).Scan(&id)
	if err != nil {
		return uuid.Nil, fmt.Errorf("platform demo company not found: %w", err)
	}
	return id, nil
}