// 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"
	"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"
)

type (
	ComplianceFramework struct {
		ID                 gid.GID   `db:"id"`
		OrganizationID     gid.GID   `db:"organization_id"`
		CompliancePortalID gid.GID   `db:"trust_center_id"`
		FrameworkID        gid.GID   `db:"framework_id"`
		Rank               int       `db:"rank"`
		CreatedAt          time.Time `db:"created_at"`
		UpdatedAt          time.Time `db:"updated_at"`

		// Visibility is a non-db field used to return all frameworks for a compliance portal, including hidden ones.
		Visibility ComplianceFrameworkVisibility `db:"visibility"`
	}

	ComplianceFrameworks []*ComplianceFramework
)

func (c ComplianceFramework) CursorKey(orderBy ComplianceFrameworkOrderField) page.CursorKey {
	switch orderBy {
	case ComplianceFrameworkOrderFieldCreatedAt:
		return page.NewCursorKey(c.ID, c.CreatedAt)
	case ComplianceFrameworkOrderFieldRank:
		return page.NewCursorKey(c.ID, c.Rank)
	}

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

func (c *ComplianceFramework) AuthorizationAttributes(
	ctx context.Context,
	conn pg.Querier,
	resourceIDs []gid.GID,
) (policy.AttributesByID, error) {
	q := `SELECT id, organization_id FROM compliance_frameworks 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 (c *ComplianceFramework) LoadByID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	complianceFrameworkID gid.GID,
) error {
	q := `
SELECT
    id,
    organization_id,
    trust_center_id,
    framework_id,
    rank,
    'PUBLIC' AS visibility,
    created_at,
    updated_at
FROM
    compliance_frameworks
WHERE
    %s
    AND id = @compliance_framework_id
LIMIT 1;
`
	q = fmt.Sprintf(q, scope.SQLFragment())

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

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

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

		return fmt.Errorf("cannot collect compliance framework: %w", err)
	}

	*c = cf

	return nil
}

func (c *ComplianceFramework) LoadByCompliancePortalIDAndFrameworkID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	compliancePortalID gid.GID,
	frameworkID gid.GID,
) error {
	q := `
SELECT
    id,
    organization_id,
    trust_center_id,
    framework_id,
    rank,
    'PUBLIC' AS visibility,
    created_at,
    updated_at
FROM
    compliance_frameworks
WHERE
    %s
    AND trust_center_id = @trust_center_id
    AND framework_id = @framework_id
LIMIT 1;
`
	q = fmt.Sprintf(q, scope.SQLFragment())

	args := pgx.StrictNamedArgs{
		"trust_center_id": compliancePortalID,
		"framework_id":    frameworkID,
	}
	maps.Copy(args, scope.SQLArguments())

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

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

		return fmt.Errorf("cannot collect compliance framework: %w", err)
	}

	*c = cf

	return nil
}

func (c *ComplianceFramework) Insert(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
INSERT INTO
    compliance_frameworks (
        id,
        tenant_id,
        organization_id,
        trust_center_id,
        framework_id,
        rank,
        created_at,
        updated_at
    )
VALUES (
    @id,
    @tenant_id,
    @organization_id,
    @trust_center_id,
    @framework_id,
    (SELECT COALESCE(MAX(rank), 0) + 1 FROM compliance_frameworks WHERE trust_center_id = @trust_center_id),
    @created_at,
    @updated_at
)
RETURNING rank;
`

	args := pgx.StrictNamedArgs{
		"id":              c.ID,
		"tenant_id":       scope.GetTenantID(),
		"organization_id": c.OrganizationID,
		"trust_center_id": c.CompliancePortalID,
		"framework_id":    c.FrameworkID,
		"created_at":      c.CreatedAt,
		"updated_at":      c.UpdatedAt,
	}

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

		return fmt.Errorf("cannot insert compliance framework: %w", err)
	}

	return nil
}

func (c *ComplianceFramework) UpdateRank(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
WITH old AS (
  SELECT
    rank AS old_rank
  FROM compliance_frameworks
  WHERE %s AND id = @id AND trust_center_id = @trust_center_id
)

UPDATE compliance_frameworks
SET
    rank = CASE
        WHEN id = @id THEN @new_rank
        ELSE rank + CASE
            WHEN @new_rank < old.old_rank THEN 1
            WHEN @new_rank > old.old_rank THEN -1
        END
    END,
    updated_at = @updated_at
FROM old
WHERE %s
  AND (
    id = @id
    OR (rank BETWEEN LEAST(old.old_rank, @new_rank) AND GREATEST(old.old_rank, @new_rank))
  );
`

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

	args := pgx.StrictNamedArgs{
		"id":              c.ID,
		"new_rank":        c.Rank,
		"trust_center_id": c.CompliancePortalID,
		"updated_at":      c.UpdatedAt,
	}
	maps.Copy(args, scope.SQLArguments())

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

	return nil
}

func (c *ComplianceFramework) Delete(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
DELETE FROM
    compliance_frameworks
WHERE
    %s
    AND id = @id;
`
	q = fmt.Sprintf(q, scope.SQLFragment())

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

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

	return nil
}

func (c *ComplianceFrameworks) LoadByCompliancePortalID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	compliancePortalID gid.GID,
	cursor *page.Cursor[ComplianceFrameworkOrderField],
) error {
	q := `
SELECT
    id,
    organization_id,
    trust_center_id,
    framework_id,
    rank,
    'PUBLIC' AS visibility,
    created_at,
    updated_at
FROM
    compliance_frameworks
WHERE
    %s
    AND trust_center_id = @trust_center_id
    AND %s
`
	q = fmt.Sprintf(q, scope.SQLFragment(), cursor.SQLFragment())

	args := pgx.NamedArgs{"trust_center_id": compliancePortalID}
	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 compliance_frameworks: %w", err)
	}

	results, err := pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[ComplianceFramework])
	if err != nil {
		return fmt.Errorf("cannot collect compliance frameworks: %w", err)
	}

	*c = results

	return nil
}

func (c *ComplianceFrameworks) LoadWithHiddenByCompliancePortalID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	compliancePortalID gid.GID,
	cursor *page.Cursor[ComplianceFrameworkOrderField],
) error {
	q := `
WITH combined AS (
    SELECT
        COALESCE(cf.id, f.id) AS id,
        COALESCE(cf.organization_id, tc.organization_id) AS organization_id,
        COALESCE(cf.trust_center_id, tc.id) AS trust_center_id,
        f.id AS framework_id,
        CASE
            WHEN cf.id IS NOT NULL THEN cf.rank
            ELSE ROW_NUMBER() OVER (ORDER BY f.created_at, f.id)
        END AS rank,
        CASE WHEN cf.id IS NULL THEN 'NONE' ELSE 'PUBLIC' END AS visibility,
        COALESCE(cf.created_at, f.created_at) AS created_at,
        COALESCE(cf.updated_at, f.updated_at) AS updated_at
    FROM trust_centers tc
    JOIN frameworks f
        ON f.organization_id = tc.organization_id
        AND f.tenant_id = @tenant_id
    LEFT JOIN compliance_frameworks cf
        ON cf.framework_id = f.id
        AND cf.trust_center_id = tc.id
        AND cf.tenant_id = @tenant_id
    WHERE tc.id = @trust_center_id
        AND tc.tenant_id = @tenant_id
)
SELECT id, organization_id, trust_center_id, framework_id, rank, visibility, created_at, updated_at
FROM combined
WHERE %s
`
	q = fmt.Sprintf(q, cursor.SQLFragment())

	args := pgx.NamedArgs{"trust_center_id": compliancePortalID}
	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 compliance frameworks with hidden: %w", err)
	}

	results, err := pgx.CollectRows(rows, pgx.RowToAddrOfStructByName[ComplianceFramework])
	if err != nil {
		return fmt.Errorf("cannot collect compliance frameworks with hidden: %w", err)
	}

	*c = results

	return nil
}