// Copyright (c) 2025-2026 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"
	"errors"
	"fmt"
	"maps"
	"time"

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

func (t TransferImpactAssessment) GetGeneratedDocumentID(
	ctx context.Context,
	conn pg.Querier,
	organizationID gid.GID,
) (*gid.GID, error) {
	var documentID *gid.GID

	err := conn.QueryRow(
		ctx,
		`
SELECT
	transfer_impact_assessments_document_id
FROM
	generated_documents
WHERE
	organization_id = @organization_id
`,
		pgx.NamedArgs{"organization_id": organizationID},
	).Scan(&documentID)
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, nil
	}

	if err != nil {
		return nil, fmt.Errorf("cannot get TIA list document ID: %w", err)
	}

	return documentID, nil
}

func (t TransferImpactAssessment) UpsertGeneratedDocumentID(
	ctx context.Context,
	conn pg.Tx,
	organizationID gid.GID,
	tenantID gid.TenantID,
	documentID gid.GID,
) error {
	now := time.Now()

	_, err := conn.Exec(
		ctx,
		`
INSERT INTO generated_documents (
	organization_id,
	tenant_id,
	transfer_impact_assessments_document_id,
	created_at,
	updated_at
) VALUES (
	@organization_id,
	@tenant_id,
	@transfer_impact_assessments_document_id,
	@created_at,
	@updated_at
)
ON CONFLICT (organization_id) DO UPDATE
SET
	transfer_impact_assessments_document_id = @transfer_impact_assessments_document_id,
	updated_at = @updated_at
`,
		pgx.NamedArgs{
			"organization_id": organizationID,
			"tenant_id":       tenantID,
			"transfer_impact_assessments_document_id": documentID,
			"created_at": now,
			"updated_at": now,
		},
	)
	if err != nil {
		return fmt.Errorf("cannot upsert TIA list document ID: %w", err)
	}

	return nil
}

func (t TransferImpactAssessment) ClearGeneratedDocumentID(
	ctx context.Context,
	conn pg.Tx,
	documentIDs []gid.GID,
) error {
	ids := make([]string, len(documentIDs))
	for i, id := range documentIDs {
		ids[i] = id.String()
	}

	_, err := conn.Exec(
		ctx,
		`
UPDATE
	generated_documents
SET
	transfer_impact_assessments_document_id = NULL,
	updated_at = @now
WHERE
	transfer_impact_assessments_document_id = ANY(@ids)
`,
		pgx.NamedArgs{
			"ids": ids,
			"now": time.Now(),
		},
	)
	if err != nil {
		return fmt.Errorf("cannot clear TIA list document references: %w", err)
	}

	return nil
}

type (
	TransferImpactAssessment struct {
		ID                    gid.GID   `db:"id"`
		OrganizationID        gid.GID   `db:"organization_id"`
		ProcessingActivityID  gid.GID   `db:"processing_activity_id"`
		DataSubjects          *string   `db:"data_subjects"`
		LegalMechanism        *string   `db:"legal_mechanism"`
		Transfer              *string   `db:"transfer"`
		LocalLawRisk          *string   `db:"local_law_risk"`
		SupplementaryMeasures *string   `db:"supplementary_measures"`
		CreatedAt             time.Time `db:"created_at"`
		UpdatedAt             time.Time `db:"updated_at"`
	}

	TransferImpactAssessments []*TransferImpactAssessment
)

func (tia *TransferImpactAssessment) CursorKey(field TransferImpactAssessmentOrderField) page.CursorKey {
	switch field {
	case TransferImpactAssessmentOrderFieldCreatedAt:
		return page.NewCursorKey(tia.ID, tia.CreatedAt)
	}

	panic(fmt.Sprintf("unsupported order by: %s", field))
}

func (tia *TransferImpactAssessment) AuthorizationAttributes(
	ctx context.Context,
	conn pg.Querier,
	resourceIDs []gid.GID,
) (policy.AttributesByID, error) {
	q := `SELECT id, organization_id FROM processing_activity_transfer_impact_assessments WHERE id = ANY(@resource_ids::text[])`

	args := pgx.StrictNamedArgs{
		"resource_ids": resourceIDs,
	}

	rows, err := conn.Query(ctx, q, args)
	if err != nil {
		return nil, fmt.Errorf("cannot query authorization attributes: %w", err)
	}

	defer rows.Close()

	attrsByID := make(policy.AttributesByID)

	for rows.Next() {
		var id, organizationID gid.GID

		if err := rows.Scan(&id, &organizationID); err != nil {
			return nil, fmt.Errorf("cannot scan authorization attributes: %w", err)
		}

		attrsByID[id] = policy.Attributes{
			"organization_id": organizationID.String(),
		}
	}

	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("cannot iterate authorization attributes: %w", err)
	}

	return attrsByID, nil
}

func (tias *TransferImpactAssessments) CountByOrganizationID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	organizationID gid.GID,
) (int, error) {
	q := `
SELECT
	COUNT(id)
FROM
	processing_activity_transfer_impact_assessments
WHERE
	%s
	AND organization_id = @organization_id
`

	q = fmt.Sprintf(q, scope.SQLFragment())

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

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

	var count int

	err := row.Scan(&count)
	if err != nil {
		return 0, fmt.Errorf("cannot count transfer impact assessments: %w", err)
	}

	return count, nil
}

func (tias *TransferImpactAssessments) LoadByOrganizationID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	organizationID gid.GID,
	cursor *page.Cursor[TransferImpactAssessmentOrderField],
) error {
	q := `
SELECT
	id,
	organization_id,
	processing_activity_id,
	data_subjects,
	legal_mechanism,
	transfer,
	local_law_risk,
	supplementary_measures,
	created_at,
	updated_at
FROM
	processing_activity_transfer_impact_assessments
WHERE
	%s
	AND organization_id = @organization_id
	AND %s
`

	q = fmt.Sprintf(q, scope.SQLFragment(), cursor.SQLFragment())

	args := pgx.StrictNamedArgs{"organization_id": organizationID}
	maps.Copy(args, scope.SQLArguments())
	maps.Copy(args, cursor.SQLArguments())

	rows, err := conn.Query(ctx, q, args)
	if err != nil {
		return fmt.Errorf("cannot query transfer impact assessments: %w", err)
	}

	results, err := pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[TransferImpactAssessment])
	if err != nil {
		return fmt.Errorf("cannot collect transfer impact assessments: %w", err)
	}

	*tias = results

	return nil
}

func (tia *TransferImpactAssessment) LoadByID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	tiaID gid.GID,
) error {
	q := `
SELECT
	id,
	organization_id,
	processing_activity_id,
	data_subjects,
	legal_mechanism,
	transfer,
	local_law_risk,
	supplementary_measures,
	created_at,
	updated_at
FROM
	processing_activity_transfer_impact_assessments
WHERE
	%s
	AND id = @tia_id
LIMIT 1;
`

	q = fmt.Sprintf(q, scope.SQLFragment())

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

	rows, err := conn.Query(ctx, q, args)
	if err != nil {
		return fmt.Errorf("cannot query transfer impact assessment: %w", err)
	}

	result, err := pgx.CollectExactlyOneRow(rows, pgx.RowToStructByName[TransferImpactAssessment])
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return ErrResourceNotFound
		}

		return fmt.Errorf("cannot collect transfer impact assessment: %w", err)
	}

	*tia = result

	return nil
}

func (tia *TransferImpactAssessment) LoadByProcessingActivityID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	processingActivityID gid.GID,
) error {
	q := `
SELECT
	id,
	organization_id,
	processing_activity_id,
	data_subjects,
	legal_mechanism,
	transfer,
	local_law_risk,
	supplementary_measures,
	created_at,
	updated_at
FROM
	processing_activity_transfer_impact_assessments
WHERE
	%s
	AND processing_activity_id = @processing_activity_id
LIMIT 1;
`

	q = fmt.Sprintf(q, scope.SQLFragment())

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

	rows, err := conn.Query(ctx, q, args)
	if err != nil {
		return fmt.Errorf("cannot query transfer impact assessment: %w", err)
	}

	result, err := pgx.CollectExactlyOneRow(rows, pgx.RowToStructByName[TransferImpactAssessment])
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return ErrResourceNotFound
		}

		return fmt.Errorf("cannot collect transfer impact assessment: %w", err)
	}

	*tia = result

	return nil
}

func (tia *TransferImpactAssessment) Insert(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
INSERT INTO processing_activity_transfer_impact_assessments (
	id,
	tenant_id,
	organization_id,
	processing_activity_id,
	data_subjects,
	legal_mechanism,
	transfer,
	local_law_risk,
	supplementary_measures,
	created_at,
	updated_at
) VALUES (
	@id,
	@tenant_id,
	@organization_id,
	@processing_activity_id,
	@data_subjects,
	@legal_mechanism,
	@transfer,
	@local_law_risk,
	@supplementary_measures,
	@created_at,
	@updated_at
)
`

	args := pgx.StrictNamedArgs{
		"id":                     tia.ID,
		"tenant_id":              scope.GetTenantID(),
		"organization_id":        tia.OrganizationID,
		"processing_activity_id": tia.ProcessingActivityID,
		"data_subjects":          tia.DataSubjects,
		"legal_mechanism":        tia.LegalMechanism,
		"transfer":               tia.Transfer,
		"local_law_risk":         tia.LocalLawRisk,
		"supplementary_measures": tia.SupplementaryMeasures,
		"created_at":             tia.CreatedAt,
		"updated_at":             tia.UpdatedAt,
	}

	_, err := conn.Exec(ctx, q, args)
	if err != nil {
		if pgErr, ok := errors.AsType[*pgconn.PgError](err); ok {
			if pgErr.Code == "23505" && pgErr.ConstraintName == "processing_activity_tias_processing_activity_id_uniq" {
				return ErrResourceAlreadyExists
			}
		}

		return fmt.Errorf("cannot insert transfer impact assessment: %w", err)
	}

	return nil
}

func (tia *TransferImpactAssessment) Update(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
UPDATE processing_activity_transfer_impact_assessments SET
	data_subjects = @data_subjects,
	legal_mechanism = @legal_mechanism,
	transfer = @transfer,
	local_law_risk = @local_law_risk,
	supplementary_measures = @supplementary_measures,
	updated_at = @updated_at
WHERE
	%s
	AND id = @id
`

	q = fmt.Sprintf(q, scope.SQLFragment())

	args := pgx.StrictNamedArgs{
		"id":                     tia.ID,
		"data_subjects":          tia.DataSubjects,
		"legal_mechanism":        tia.LegalMechanism,
		"transfer":               tia.Transfer,
		"local_law_risk":         tia.LocalLawRisk,
		"supplementary_measures": tia.SupplementaryMeasures,
		"updated_at":             tia.UpdatedAt,
	}
	maps.Copy(args, scope.SQLArguments())

	_, err := conn.Exec(ctx, q, args)
	if err != nil {
		return fmt.Errorf("cannot update transfer impact assessment: %w", err)
	}

	return nil
}

func (tia *TransferImpactAssessment) Delete(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
DELETE FROM processing_activity_transfer_impact_assessments
WHERE
	%s
	AND id = @id
`

	q = fmt.Sprintf(q, scope.SQLFragment())

	args := pgx.StrictNamedArgs{"id": tia.ID}
	maps.Copy(args, scope.SQLArguments())

	_, err := conn.Exec(ctx, q, args)
	if err != nil {
		return fmt.Errorf("cannot delete transfer impact assessment: %w", err)
	}

	return nil
}