// 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"
	"errors"
	"fmt"
	"maps"
	"time"

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

type (
	// AccessReviewCampaignSource is the per-campaign snapshot of an access
	// source. It captures the source identity (name, connector) at
	// the time the source was scoped into the campaign so that the review's
	// data survives even if the live access source is later deleted. Access
	// entries and fetch attempts reference this snapshot, not the live source.
	AccessReviewCampaignSource struct {
		ID                     gid.GID      `db:"id"`
		OrganizationID         gid.GID      `db:"organization_id"`
		TenantID               gid.TenantID `db:"tenant_id"`
		AccessReviewCampaignID gid.GID      `db:"access_review_campaign_id"`
		AccessReviewSourceID   *gid.GID     `db:"access_review_source_id"`
		Name                   string       `db:"name"`
		ConnectorID            *gid.GID     `db:"connector_id"`
		CreatedAt              time.Time    `db:"created_at"`
		UpdatedAt              time.Time    `db:"updated_at"`
	}

	AccessReviewCampaignSources []*AccessReviewCampaignSource
)

func (s *AccessReviewCampaignSource) AuthorizationAttributes(
	ctx context.Context,
	conn pg.Querier,
	resourceIDs []gid.GID,
) (policy.AttributesByID, error) {
	q := `SELECT id, organization_id FROM access_review_campaign_sources 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
}

// Upsert inserts the snapshot or refreshes its denormalized identity from the
// live source. The generated ID is preserved across upserts because it is not
// part of the conflict target, so entries that already reference the snapshot
// keep pointing at the same row.
func (s *AccessReviewCampaignSource) Upsert(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
INSERT INTO access_review_campaign_sources (
	id,
	organization_id,
	tenant_id,
	access_review_campaign_id,
	access_review_source_id,
	name,
	connector_id,
	created_at,
	updated_at
) VALUES (
	@id,
	@organization_id,
	@tenant_id,
	@access_review_campaign_id,
	@access_review_source_id,
	@name,
	@connector_id,
	@created_at,
	@updated_at
)
ON CONFLICT (access_review_campaign_id, access_review_source_id) DO UPDATE SET
	name         = EXCLUDED.name,
	connector_id = EXCLUDED.connector_id,
	updated_at   = EXCLUDED.updated_at
RETURNING id
`
	args := pgx.StrictNamedArgs{
		"id":                        s.ID,
		"organization_id":           s.OrganizationID,
		"tenant_id":                 scope.GetTenantID(),
		"access_review_campaign_id": s.AccessReviewCampaignID,
		"access_review_source_id":   s.AccessReviewSourceID,
		"name":                      s.Name,
		"connector_id":              s.ConnectorID,
		"created_at":                s.CreatedAt,
		"updated_at":                s.UpdatedAt,
	}

	if err := conn.QueryRow(ctx, q, args).Scan(&s.ID); err != nil {
		return fmt.Errorf("cannot upsert campaign source: %w", err)
	}

	return nil
}

func (sources *AccessReviewCampaignSources) MergeByCampaignID(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
	campaignID gid.GID,
	accessReviewSources AccessReviewSources,
) error {
	ids := make([]string, 0, len(accessReviewSources))
	organizationIDs := make([]string, 0, len(accessReviewSources))
	names := make([]string, 0, len(accessReviewSources))
	connectorIDs := make([]*string, 0, len(accessReviewSources))

	seen := make(map[gid.GID]struct{}, len(accessReviewSources))
	for _, source := range accessReviewSources {
		if _, ok := seen[source.ID]; ok {
			continue
		}

		seen[source.ID] = struct{}{}

		var connectorID *string

		if source.ConnectorID != nil {
			s := source.ConnectorID.String()
			connectorID = &s
		}

		ids = append(ids, source.ID.String())
		organizationIDs = append(organizationIDs, source.OrganizationID.String())
		names = append(names, source.Name)
		connectorIDs = append(connectorIDs, connectorID)
	}

	now := time.Now()

	q := `
WITH desired_sources AS (
	SELECT
		id AS access_review_source_id,
		organization_id,
		name,
		connector_id
	FROM unnest(
		@access_review_source_ids::text[],
		@organization_ids::text[],
		@names::text[],
		@connector_ids::text[]
	) AS t(id, organization_id, name, connector_id)
)
MERGE INTO access_review_campaign_sources AS target
USING desired_sources AS source
ON
	%s
	AND target.access_review_campaign_id = @access_review_campaign_id
	AND target.access_review_source_id = source.access_review_source_id
WHEN MATCHED THEN
	UPDATE SET
		name         = source.name,
		connector_id = source.connector_id,
		updated_at   = @now
WHEN NOT MATCHED THEN
	INSERT (
		id,
		organization_id,
		tenant_id,
		access_review_campaign_id,
		access_review_source_id,
		name,
		connector_id,
		created_at,
		updated_at
	)
	VALUES (
		generate_gid(decode_base64_unpadded(@tenant_id), @access_review_campaign_source_entity_type),
		source.organization_id,
		@tenant_id,
		@access_review_campaign_id,
		source.access_review_source_id,
		source.name,
		source.connector_id,
		@now,
		@now
	)
WHEN NOT MATCHED BY SOURCE
	AND %s
	AND target.access_review_campaign_id = @access_review_campaign_id THEN
	DELETE
`

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

	args := pgx.StrictNamedArgs{
		"access_review_campaign_id": campaignID,
		"access_review_source_ids":  ids,
		"organization_ids":          organizationIDs,
		"names":                     names,
		"connector_ids":             connectorIDs,
		"access_review_campaign_source_entity_type": AccessReviewCampaignSourceEntityType,
		"tenant_id": scope.GetTenantID(),
		"now":       now,
	}
	maps.Copy(args, scope.SQLArguments())

	if _, err := conn.Exec(ctx, q, args); err != nil {
		return fmt.Errorf("cannot merge campaign sources: %w", err)
	}

	return nil
}

func (s *AccessReviewCampaignSource) LoadByID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	id gid.GID,
) error {
	q := `
SELECT
	id,
	organization_id,
	tenant_id,
	access_review_campaign_id,
	access_review_source_id,
	name,
	connector_id,
	created_at,
	updated_at
FROM access_review_campaign_sources
WHERE
	%s
	AND id = @id
LIMIT 1
`
	q = fmt.Sprintf(q, scope.SQLFragment())

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

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

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

		return fmt.Errorf("cannot collect campaign source: %w", err)
	}

	*s = result

	return nil
}

func (s *AccessReviewCampaignSource) DeleteByCampaignIDAndAccessReviewSourceID(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
	campaignID gid.GID,
	accessSourceID gid.GID,
) error {
	q := `
DELETE FROM access_review_campaign_sources
WHERE
	%s
	AND access_review_campaign_id = @access_review_campaign_id
	AND access_review_source_id = @access_review_source_id
`
	q = fmt.Sprintf(q, scope.SQLFragment())

	args := pgx.StrictNamedArgs{
		"access_review_campaign_id": campaignID,
		"access_review_source_id":   accessSourceID,
	}
	maps.Copy(args, scope.SQLArguments())

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

	return nil
}

func (sources *AccessReviewCampaignSources) LoadByCampaignID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	campaignID gid.GID,
) error {
	q := `
SELECT
	id,
	organization_id,
	tenant_id,
	access_review_campaign_id,
	access_review_source_id,
	name,
	connector_id,
	created_at,
	updated_at
FROM access_review_campaign_sources
WHERE
	%s
	AND access_review_campaign_id = @access_review_campaign_id
ORDER BY name ASC
`
	q = fmt.Sprintf(q, scope.SQLFragment())

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

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

	result, err := pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[AccessReviewCampaignSource])
	if err != nil {
		return fmt.Errorf("cannot collect campaign sources: %w", err)
	}

	*sources = result

	return nil
}