// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package coredata

import (
	"context"
	"fmt"
	"maps"
	"time"

	"github.com/jackc/pgx/v5"
	"go.gearno.de/kit/pg"
	"go.probo.inc/probo/pkg/gid"
)

type (
	ControlObligation struct {
		ControlID    gid.GID   `db:"control_id"`
		ObligationID gid.GID   `db:"obligation_id"`
		CreatedAt    time.Time `db:"created_at"`
	}

	ControlObligations []*ControlObligation

	ControlObligationType struct {
		ControlID      gid.GID        `db:"control_id"`
		ObligationType ObligationType `db:"obligation_type"`
	}
)

func (co ControlObligation) Upsert(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
) error {
	q := `
INSERT INTO
    controls_obligations (
        control_id,
        obligation_id,
        tenant_id,
        created_at
    )
VALUES (
    @control_id,
    @obligation_id,
    @tenant_id,
    @created_at
)
ON CONFLICT (control_id, obligation_id) DO NOTHING;
`

	args := pgx.StrictNamedArgs{
		"control_id":    co.ControlID,
		"obligation_id": co.ObligationID,
		"tenant_id":     scope.GetTenantID(),
		"created_at":    co.CreatedAt,
	}
	_, err := conn.Exec(ctx, q, args)

	return err
}

func (co ControlObligation) Delete(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
	controlID gid.GID,
	obligationID gid.GID,
) error {
	q := `
DELETE
FROM
    controls_obligations
WHERE
    %s
    AND control_id = @control_id
    AND obligation_id = @obligation_id;
`

	args := pgx.StrictNamedArgs{
		"control_id":    controlID,
		"obligation_id": obligationID,
	}
	maps.Copy(args, scope.SQLArguments())
	q = fmt.Sprintf(q, scope.SQLFragment())

	_, err := conn.Exec(ctx, q, args)

	return err
}

func (cos *ControlObligations) CountByControlID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	controlID gid.GID,
	filter *ControlObligationFilter,
) (int, error) {
	q := `
WITH control_obls AS (
	SELECT
		co.control_id,
		o.type,
		o.tenant_id
	FROM
		controls_obligations co
	INNER JOIN
		obligations o ON co.obligation_id = o.id
	WHERE
		co.control_id = @control_id
)
SELECT
	COUNT(*)
FROM
	control_obls
WHERE %s
	AND %s
`
	q = fmt.Sprintf(q, scope.SQLFragment(), filter.SQLFragment())

	args := pgx.StrictNamedArgs{"control_id": controlID}
	maps.Copy(args, scope.SQLArguments())
	maps.Copy(args, filter.SQLArguments())

	row := conn.QueryRow(ctx, q, args)

	var count int
	if err := row.Scan(&count); err != nil {
		return 0, fmt.Errorf("cannot count control obligations: %w", err)
	}

	return count, nil
}

func LoadObligationTypesByControlIDs(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	controlIDs []gid.GID,
) ([]ControlObligationType, error) {
	q := `
WITH control_obls AS (
    SELECT DISTINCT
        co.control_id,
        o.type AS obligation_type,
        o.tenant_id
    FROM
        controls_obligations co
    INNER JOIN
        obligations o ON co.obligation_id = o.id
    WHERE
        co.control_id = ANY(@control_ids)
)
SELECT
    control_id,
    obligation_type
FROM
    control_obls
WHERE
    %s;
`
	q = fmt.Sprintf(q, scope.SQLFragment())

	args := pgx.StrictNamedArgs{"control_ids": controlIDs}
	maps.Copy(args, scope.SQLArguments())

	rows, err := conn.Query(ctx, q, args)
	if err != nil {
		return nil, fmt.Errorf("cannot load obligation types by control IDs: %w", err)
	}

	result, err := pgx.CollectRows(rows, pgx.RowToStructByName[ControlObligationType])
	if err != nil {
		return nil, fmt.Errorf("cannot collect control obligation types: %w", err)
	}

	return result, nil
}