package repository

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

	"github.com/google/uuid"
	"github.com/muyuqingfeng/iloom/purchaser-service/internal/model"
	"github.com/muyuqingfeng/iloom/shared/pkg/types"
)

type PlanRepo struct {
	db *sql.DB
}

func NewPlanRepo(db *sql.DB) *PlanRepo {
	return &PlanRepo{db: db}
}

func (r *PlanRepo) List(ctx context.Context, companyID string, p types.Pagination, status string) ([]model.ProductionPlan, int, error) {
	countQuery := `SELECT COUNT(*) FROM ilm_production_plan WHERE purchaser_id = ?`
	args := []interface{}{companyID}

	if status != "" {
		countQuery += " AND status = ?"
		args = append(args, status)
	}

	var total int
	if err := r.db.QueryRowContext(ctx, countQuery, args...).Scan(&total); err != nil {
		return nil, 0, fmt.Errorf("count plans: %w", err)
	}

	query := `SELECT id, plan_code, purchaser_id, product_name, fabric_code, color, color_code,
		target_quantity, completed_quantity, production_price, yarn_usage_per_meter,
		status, remark, start_time, created_by, created_at, updated_at
		FROM ilm_production_plan WHERE purchaser_id = ?`

	queryArgs := []interface{}{companyID}

	if status != "" {
		query += " AND status = ?"
		queryArgs = append(queryArgs, status)
	}

	query += " ORDER BY created_at DESC"
	query += " LIMIT ? OFFSET ?"
	queryArgs = append(queryArgs, p.PageSize, p.Offset())

	rows, err := r.db.QueryContext(ctx, query, queryArgs...)
	if err != nil {
		return nil, 0, fmt.Errorf("list plans: %w", err)
	}
	defer rows.Close()

	var plans []model.ProductionPlan
	for rows.Next() {
		var plan model.ProductionPlan
		if err := rows.Scan(
			&plan.ID, &plan.PlanCode, &plan.PurchaserID, &plan.ProductName,
			&plan.FabricCode, &plan.Color, &plan.ColorCode,
			&plan.TargetQuantity, &plan.CompletedQuantity,
			&plan.ProductionPrice, &plan.YarnUsagePerMeter,
			&plan.Status, &plan.Remark, &plan.StartTime,
			&plan.CreatedBy, &plan.CreatedAt, &plan.UpdatedAt,
		); err != nil {
			return nil, 0, fmt.Errorf("scan plan: %w", err)
		}
		plans = append(plans, plan)
	}
	return plans, total, nil
}

func (r *PlanRepo) Create(ctx context.Context, tx *sql.Tx, plan *model.ProductionPlan) error {
	query := `INSERT INTO ilm_production_plan
		(id, plan_code, purchaser_id, product_name, fabric_code, color, color_code,
		 target_quantity, completed_quantity, production_price, yarn_usage_per_meter,
		 status, remark, start_time, created_by, created_at, updated_at)
		VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)`
	_, err := tx.ExecContext(ctx, query,
		plan.ID, plan.PlanCode, plan.PurchaserID, plan.ProductName,
		plan.FabricCode, plan.Color, plan.ColorCode,
		plan.TargetQuantity, plan.CompletedQuantity,
		plan.ProductionPrice, plan.YarnUsagePerMeter,
		plan.Status, plan.Remark, plan.StartTime,
		plan.CreatedBy, plan.CreatedAt, plan.UpdatedAt,
	)
	if err != nil {
		return fmt.Errorf("insert plan: %w", err)
	}
	return nil
}

func (r *PlanRepo) CreateYarnRatios(ctx context.Context, tx *sql.Tx, ratios []model.YarnRatio) error {
	for _, ratio := range ratios {
		query := `INSERT INTO ilm_yarn_ratio
			(id, plan_id, yarn_name, yarn_type, ratio, amount_per_meter, total_amount, company_id, created_at)
			VALUES (?,?,?,?,?,?,?,?,?)`
		_, err := tx.ExecContext(ctx, query,
			ratio.ID, ratio.PlanID, ratio.YarnName, ratio.YarnType,
			ratio.Ratio, ratio.AmountPerMeter, ratio.TotalAmount,
			ratio.CompanyID, ratio.CreatedAt,
		)
		if err != nil {
			return fmt.Errorf("insert yarn ratio: %w", err)
		}
	}
	return nil
}

func (r *PlanRepo) GetByID(ctx context.Context, id string) (*model.ProductionPlan, error) {
	query := `SELECT id, plan_code, purchaser_id, product_name, fabric_code, color, color_code,
		target_quantity, completed_quantity, production_price, yarn_usage_per_meter,
		status, remark, start_time, created_by, created_at, updated_at
		FROM ilm_production_plan WHERE id = ?`

	plan := &model.ProductionPlan{}
	err := r.db.QueryRowContext(ctx, query, id).Scan(
		&plan.ID, &plan.PlanCode, &plan.PurchaserID, &plan.ProductName,
		&plan.FabricCode, &plan.Color, &plan.ColorCode,
		&plan.TargetQuantity, &plan.CompletedQuantity,
		&plan.ProductionPrice, &plan.YarnUsagePerMeter,
		&plan.Status, &plan.Remark, &plan.StartTime,
		&plan.CreatedBy, &plan.CreatedAt, &plan.UpdatedAt,
	)
	if err != nil {
		if err == sql.ErrNoRows {
			return nil, nil
		}
		return nil, fmt.Errorf("get plan by id: %w", err)
	}

	// Load yarn ratios
	yarnRows, err := r.db.QueryContext(ctx,
		`SELECT id, plan_id, yarn_name, yarn_type, ratio, amount_per_meter, total_amount, company_id, created_at
		 FROM ilm_yarn_ratio WHERE plan_id = ? ORDER BY created_at`, id)
	if err != nil {
		return nil, fmt.Errorf("get yarn ratios: %w", err)
	}
	defer yarnRows.Close()

	for yarnRows.Next() {
		var yr model.YarnRatio
		if err := yarnRows.Scan(
			&yr.ID, &yr.PlanID, &yr.YarnName, &yr.YarnType,
			&yr.Ratio, &yr.AmountPerMeter, &yr.TotalAmount,
			&yr.CompanyID, &yr.CreatedAt,
		); err != nil {
			return nil, fmt.Errorf("scan yarn ratio: %w", err)
		}
		plan.YarnRatios = append(plan.YarnRatios, yr)
	}

	// Load factories
	factoryRows, err := r.db.QueryContext(ctx,
		`SELECT pf.id, pf.plan_id, pf.factory_id, pf.factory_type, pf.created_at,
		        COALESCE(c.name, '') as factory_name
		 FROM ilm_plan_factory pf
		 LEFT JOIN ilm_company c ON c.id = pf.factory_id
		 WHERE pf.plan_id = ? ORDER BY pf.created_at`, id)
	if err != nil {
		return nil, fmt.Errorf("get plan factories: %w", err)
	}
	defer factoryRows.Close()

	for factoryRows.Next() {
		var pf model.PlanFactory
		if err := factoryRows.Scan(
			&pf.ID, &pf.PlanID, &pf.FactoryID, &pf.FactoryType,
			&pf.CreatedAt, &pf.FactoryName,
		); err != nil {
			return nil, fmt.Errorf("scan plan factory: %w", err)
		}
		plan.Factories = append(plan.Factories, pf)
	}

	return plan, nil
}

func (r *PlanRepo) Update(ctx context.Context, plan *model.ProductionPlan) error {
	query := `UPDATE ilm_production_plan SET
		product_name = ?, fabric_code = ?, color = ?, color_code = ?,
		target_quantity = ?, production_price = ?, yarn_usage_per_meter = ?,
		status = ?, remark = ?, updated_at = ?
		WHERE id = ?`
	_, err := r.db.ExecContext(ctx, query,
		plan.ProductName, plan.FabricCode, plan.Color, plan.ColorCode,
		plan.TargetQuantity, plan.ProductionPrice, plan.YarnUsagePerMeter,
		plan.Status, plan.Remark, time.Now(),
		plan.ID,
	)
	if err != nil {
		return fmt.Errorf("update plan: %w", err)
	}
	return nil
}

func (r *PlanRepo) Delete(ctx context.Context, id, companyID string) error {
	_, err := r.db.ExecContext(ctx,
		`DELETE FROM ilm_production_plan WHERE id = ? AND purchaser_id = ?`,
		id, companyID,
	)
	if err != nil {
		return fmt.Errorf("delete plan: %w", err)
	}
	return nil
}

func (r *PlanRepo) AssignFactory(ctx context.Context, planID, factoryID, factoryType string) error {
	id := uuid.New().String()
	_, err := r.db.ExecContext(ctx,
		`INSERT INTO ilm_plan_factory (id, plan_id, factory_id, factory_type, created_at)
		 VALUES (?, ?, ?, ?, ?)`,
		id, planID, factoryID, factoryType, time.Now(),
	)
	if err != nil {
		return fmt.Errorf("assign factory: %w", err)
	}
	return nil
}

func (r *PlanRepo) GetSteps(ctx context.Context, planID string) ([]model.ProcessStep, error) {
	rows, err := r.db.QueryContext(ctx,
		`SELECT ps.id, ps.plan_id, ps.step_type, ps.status, ps.notes,
		        ps.operator_id, ps.company_id, ps.timestamp, ps.created_at,
		        COALESCE(su.real_name, '') as operator_name
		 FROM ilm_process_step ps
		 LEFT JOIN sys_user su ON su.user_id = ps.operator_id
		 WHERE ps.plan_id = ? ORDER BY ps.created_at`, planID)
	if err != nil {
		return nil, fmt.Errorf("get steps: %w", err)
	}
	defer rows.Close()

	var steps []model.ProcessStep
	for rows.Next() {
		var s model.ProcessStep
		if err := rows.Scan(
			&s.ID, &s.PlanID, &s.StepType, &s.Status, &s.Notes,
			&s.OperatorID, &s.CompanyID, &s.Timestamp, &s.CreatedAt,
			&s.OperatorName,
		); err != nil {
			return nil, fmt.Errorf("scan step: %w", err)
		}
		steps = append(steps, s)
	}
	return steps, nil
}

func (r *PlanRepo) GetInventory(ctx context.Context, planID string) ([]model.InventoryRecord, error) {
	rows, err := r.db.QueryContext(ctx,
		`SELECT ir.id, ir.plan_id, ir.warehouse_id, ir.quantity, ir.rolls,
		        ir.price_per_meter, ir.price_note, ir.warehouse_location,
		        ir.operator_id, ir.company_id, ir.created_at,
		        COALESCE(su.real_name, '') as operator_name
		 FROM ilm_inventory_record ir
		 LEFT JOIN sys_user su ON su.user_id = ir.operator_id
		 WHERE ir.plan_id = ? ORDER BY ir.created_at DESC`, planID)
	if err != nil {
		return nil, fmt.Errorf("get inventory: %w", err)
	}
	defer rows.Close()

	var records []model.InventoryRecord
	for rows.Next() {
		var rec model.InventoryRecord
		if err := rows.Scan(
			&rec.ID, &rec.PlanID, &rec.WarehouseID, &rec.Quantity, &rec.Rolls,
			&rec.PricePerMeter, &rec.PriceNote, &rec.WarehouseLocation,
			&rec.OperatorID, &rec.CompanyID, &rec.CreatedAt,
			&rec.OperatorName,
		); err != nil {
			return nil, fmt.Errorf("scan inventory record: %w", err)
		}
		records = append(records, rec)
	}
	return records, nil
}

func (r *PlanRepo) CountByStatus(ctx context.Context, companyID string) (total, producing, completed int, err error) {
	query := `SELECT
		COUNT(*),
		COALESCE(SUM(CASE WHEN status = 'producing' THEN 1 ELSE 0 END), 0),
		COALESCE(SUM(CASE WHEN status = 'completed' THEN 1 ELSE 0 END), 0)
		FROM ilm_production_plan WHERE purchaser_id = ?`
	err = r.db.QueryRowContext(ctx, query, companyID).Scan(&total, &producing, &completed)
	if err != nil {
		return 0, 0, 0, fmt.Errorf("count by status: %w", err)
	}
	return
}

func (r *PlanRepo) Recent(ctx context.Context, companyID string, limit int) ([]model.ProductionPlan, error) {
	query := `SELECT id, plan_code, purchaser_id, product_name, fabric_code, color, color_code,
		target_quantity, completed_quantity, production_price, yarn_usage_per_meter,
		status, remark, start_time, created_by, created_at, updated_at
		FROM ilm_production_plan WHERE purchaser_id = ?
		ORDER BY created_at DESC LIMIT ?`

	rows, err := r.db.QueryContext(ctx, query, companyID, limit)
	if err != nil {
		return nil, fmt.Errorf("recent plans: %w", err)
	}
	defer rows.Close()

	var plans []model.ProductionPlan
	for rows.Next() {
		var plan model.ProductionPlan
		if err := rows.Scan(
			&plan.ID, &plan.PlanCode, &plan.PurchaserID, &plan.ProductName,
			&plan.FabricCode, &plan.Color, &plan.ColorCode,
			&plan.TargetQuantity, &plan.CompletedQuantity,
			&plan.ProductionPrice, &plan.YarnUsagePerMeter,
			&plan.Status, &plan.Remark, &plan.StartTime,
			&plan.CreatedBy, &plan.CreatedAt, &plan.UpdatedAt,
		); err != nil {
			return nil, fmt.Errorf("scan recent plan: %w", err)
		}
		plans = append(plans, plan)
	}
	return plans, nil
}