// 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"
	"go.probo.inc/probo/pkg/page"
)

type (
	AccessReviewEntry struct {
		ID                           gid.GID                         `db:"id"`
		OrganizationID               gid.GID                         `db:"organization_id"`
		AccessReviewCampaignID       gid.GID                         `db:"access_review_campaign_id"`
		AccessReviewCampaignSourceID gid.GID                         `db:"access_review_campaign_source_id"`
		IdentityID                   *gid.GID                        `db:"identity_id"`
		Email                        string                          `db:"email"`
		FullName                     string                          `db:"full_name"`
		Roles                        []string                        `db:"roles"`
		JobTitle                     string                          `db:"job_title"`
		IsAdmin                      bool                            `db:"is_admin"`
		MFAStatus                    MFAStatus                       `db:"mfa_status"`
		AuthMethod                   AccessReviewEntryAuthMethod     `db:"auth_method"`
		AccountType                  AccessReviewEntryAccountType    `db:"account_type"`
		Active                       *bool                           `db:"active"`
		LastLogin                    *time.Time                      `db:"last_login"`
		AccountCreatedAt             *time.Time                      `db:"account_created_at"`
		ExternalID                   string                          `db:"external_id"`
		AccountKey                   string                          `db:"account_key"`
		IncrementalTag               AccessReviewEntryIncrementalTag `db:"incremental_tag"`
		Flags                        []AccessReviewEntryFlag         `db:"flags"`
		FlagReasons                  []string                        `db:"flag_reasons"`
		Decision                     AccessReviewEntryDecision       `db:"decision"`
		DecisionNote                 *string                         `db:"decision_note"`
		DecidedBy                    *gid.GID                        `db:"decided_by"`
		DecidedAt                    *time.Time                      `db:"decided_at"`
		CreatedAt                    time.Time                       `db:"created_at"`
		UpdatedAt                    time.Time                       `db:"updated_at"`
	}

	AccessReviewEntries []*AccessReviewEntry
)

func (e AccessReviewEntry) CursorKey(orderBy AccessReviewEntryOrderField) page.CursorKey {
	switch orderBy {
	case AccessReviewEntryOrderFieldCreatedAt:
		return page.NewCursorKey(e.ID, e.CreatedAt)
	}

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

func (e *AccessReviewEntry) AuthorizationAttributes(
	ctx context.Context,
	conn pg.Querier,
	resourceIDs []gid.GID,
) (policy.AttributesByID, error) {
	q := `SELECT id, organization_id FROM access_review_entries 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 (e *AccessReviewEntry) LoadByID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	id gid.GID,
) error {
	q := `
SELECT
    id,
    organization_id,
    access_review_campaign_id,
    access_review_campaign_source_id,
    identity_id,
    email,
    full_name,
    roles,
    job_title,
    is_admin,
    mfa_status,
    auth_method,
    account_type,
    active,
    last_login,
    account_created_at,
    external_id,
    account_key,
    incremental_tag,
    flags,
    flag_reasons,
    decision,
    decision_note,
    decided_by,
    decided_at,
    created_at,
    updated_at
FROM
    access_review_entries
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 access_review_entries: %w", err)
	}

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

		return fmt.Errorf("cannot collect access entry: %w", err)
	}

	*e = entry

	return nil
}

func (e *AccessReviewEntry) Insert(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
INSERT INTO
    access_review_entries (
        id,
        tenant_id,
        organization_id,
        access_review_campaign_id,
        access_review_campaign_source_id,
        identity_id,
        email,
        full_name,
        roles,
        job_title,
        is_admin,
        mfa_status,
        auth_method,
        account_type,
        active,
        last_login,
        account_created_at,
        external_id,
        account_key,
        incremental_tag,
        flags,
        flag_reasons,
        decision,
        decision_note,
        decided_by,
        decided_at,
        created_at,
        updated_at
    )
VALUES (
    @id,
    @tenant_id,
    @organization_id,
    @access_review_campaign_id,
    @access_review_campaign_source_id,
    @identity_id,
    @email,
    @full_name,
    COALESCE(@roles, '{}'::TEXT[]),
    @job_title,
    @is_admin,
    @mfa_status,
    @auth_method,
    @account_type,
    COALESCE(@active, TRUE),
    @last_login,
    @account_created_at,
    @external_id,
    @account_key,
    @incremental_tag,
    @flags,
    @flag_reasons,
    @decision,
    @decision_note,
    @decided_by,
    @decided_at,
    @created_at,
    @updated_at
);
`

	args := pgx.StrictNamedArgs{
		"id":                               e.ID,
		"tenant_id":                        scope.GetTenantID(),
		"organization_id":                  e.OrganizationID,
		"access_review_campaign_id":        e.AccessReviewCampaignID,
		"access_review_campaign_source_id": e.AccessReviewCampaignSourceID,
		"identity_id":                      e.IdentityID,
		"email":                            e.Email,
		"full_name":                        e.FullName,
		"roles":                            e.Roles,
		"job_title":                        e.JobTitle,
		"is_admin":                         e.IsAdmin,
		"mfa_status":                       e.MFAStatus,
		"auth_method":                      e.AuthMethod,
		"account_type":                     e.AccountType,
		"active":                           e.Active,
		"last_login":                       e.LastLogin,
		"account_created_at":               e.AccountCreatedAt,
		"external_id":                      e.ExternalID,
		"account_key":                      e.AccountKey,
		"incremental_tag":                  e.IncrementalTag,
		"flags":                            e.Flags,
		"flag_reasons":                     e.FlagReasons,
		"decision":                         e.Decision,
		"decision_note":                    e.DecisionNote,
		"decided_by":                       e.DecidedBy,
		"decided_at":                       e.DecidedAt,
		"created_at":                       e.CreatedAt,
		"updated_at":                       e.UpdatedAt,
	}

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

	return nil
}

func (e *AccessReviewEntry) Update(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
UPDATE access_review_entries
SET
    flags = @flags,
    flag_reasons = @flag_reasons,
    decision = @decision,
    decision_note = @decision_note,
    decided_by = @decided_by,
    decided_at = @decided_at,
    updated_at = @updated_at
WHERE
    %s
    AND id = @id
`
	q = fmt.Sprintf(q, scope.SQLFragment())

	args := pgx.StrictNamedArgs{
		"id":            e.ID,
		"flags":         e.Flags,
		"flag_reasons":  e.FlagReasons,
		"decision":      e.Decision,
		"decision_note": e.DecisionNote,
		"decided_by":    e.DecidedBy,
		"decided_at":    e.DecidedAt,
		"updated_at":    e.UpdatedAt,
	}
	maps.Copy(args, scope.SQLArguments())

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

	if result.RowsAffected() == 0 {
		return ErrResourceNotFound
	}

	return nil
}

func (entries *AccessReviewEntries) LoadByCampaignID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	campaignID gid.GID,
	cursor *page.Cursor[AccessReviewEntryOrderField],
	filter *AccessReviewEntryFilter,
) error {
	q := `
SELECT
    id,
    organization_id,
    access_review_campaign_id,
    access_review_campaign_source_id,
    identity_id,
    email,
    full_name,
    roles,
    job_title,
    is_admin,
    mfa_status,
    auth_method,
    account_type,
    active,
    last_login,
    account_created_at,
    external_id,
    account_key,
    incremental_tag,
    flags,
    flag_reasons,
    decision,
    decision_note,
    decided_by,
    decided_at,
    created_at,
    updated_at
FROM
    access_review_entries
WHERE
    %s
    AND access_review_campaign_id = @campaign_id
    AND %s
    AND %s
`
	q = fmt.Sprintf(q, scope.SQLFragment(), filter.SQLFragment(), cursor.SQLFragment())

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

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

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

	*entries = result

	return nil
}

func (entries *AccessReviewEntries) LoadByCampaignIDAndSourceID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	campaignID gid.GID,
	sourceID gid.GID,
	cursor *page.Cursor[AccessReviewEntryOrderField],
	filter *AccessReviewEntryFilter,
) error {
	q := `
SELECT
    id,
    organization_id,
    access_review_campaign_id,
    access_review_campaign_source_id,
    identity_id,
    email,
    full_name,
    roles,
    job_title,
    is_admin,
    mfa_status,
    auth_method,
    account_type,
    active,
    last_login,
    account_created_at,
    external_id,
    account_key,
    incremental_tag,
    flags,
    flag_reasons,
    decision,
    decision_note,
    decided_by,
    decided_at,
    created_at,
    updated_at
FROM
    access_review_entries
WHERE
    %s
    AND access_review_campaign_id = @campaign_id
    AND access_review_campaign_source_id = @source_id
    AND %s
    AND %s
`
	q = fmt.Sprintf(q, scope.SQLFragment(), filter.SQLFragment(), cursor.SQLFragment())

	args := pgx.StrictNamedArgs{"campaign_id": campaignID, "source_id": sourceID}
	maps.Copy(args, scope.SQLArguments())
	maps.Copy(args, filter.SQLArguments())
	maps.Copy(args, cursor.SQLArguments())

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

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

	*entries = result

	return nil
}

func (entries *AccessReviewEntries) CountByCampaignID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	campaignID gid.GID,
	filter *AccessReviewEntryFilter,
) (int, error) {
	q := `
SELECT COUNT(id)
FROM access_review_entries
WHERE
    %s
    AND access_review_campaign_id = @campaign_id
    AND %s;
`
	q = fmt.Sprintf(q, scope.SQLFragment(), filter.SQLFragment())

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

	var count int
	if err := conn.QueryRow(ctx, q, args).Scan(&count); err != nil {
		return 0, fmt.Errorf("cannot count access_review_entries: %w", err)
	}

	return count, nil
}

func (entries *AccessReviewEntries) CountByCampaignIDAndSourceID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	campaignID gid.GID,
	sourceID gid.GID,
	filter *AccessReviewEntryFilter,
) (int, error) {
	q := `
SELECT COUNT(id)
FROM access_review_entries
WHERE
    %s
    AND access_review_campaign_id = @campaign_id
    AND access_review_campaign_source_id = @source_id
    AND %s;
`
	q = fmt.Sprintf(q, scope.SQLFragment(), filter.SQLFragment())

	args := pgx.StrictNamedArgs{"campaign_id": campaignID, "source_id": sourceID}
	maps.Copy(args, scope.SQLArguments())
	maps.Copy(args, filter.SQLArguments())

	var count int
	if err := conn.QueryRow(ctx, q, args).Scan(&count); err != nil {
		return 0, fmt.Errorf("cannot count access_review_entries: %w", err)
	}

	return count, nil
}

func (e *AccessReviewEntry) LoadOrganizationID(
	ctx context.Context,
	conn pg.Querier,
	entryID gid.GID,
) (gid.GID, error) {
	q := `SELECT organization_id FROM access_review_entries WHERE id = $1 LIMIT 1;`

	var organizationID gid.GID
	if err := conn.QueryRow(ctx, q, entryID).Scan(&organizationID); err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return gid.GID{}, ErrResourceNotFound
		}

		return gid.GID{}, fmt.Errorf("cannot load organization id for access entry: %w", err)
	}

	return organizationID, nil
}

func (e *AccessReviewEntry) UpdateFlags(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
UPDATE access_review_entries
SET
    flags = @flags,
    flag_reasons = @flag_reasons,
    updated_at = @updated_at
WHERE
    %s
    AND id = @id
`
	q = fmt.Sprintf(q, scope.SQLFragment())

	args := pgx.StrictNamedArgs{
		"id":           e.ID,
		"flags":        e.Flags,
		"flag_reasons": e.FlagReasons,
		"updated_at":   e.UpdatedAt,
	}
	maps.Copy(args, scope.SQLArguments())

	result, err := conn.Exec(ctx, q, args)
	if err != nil {
		return fmt.Errorf("cannot update access entry flags: %w", err)
	}

	if result.RowsAffected() == 0 {
		return ErrResourceNotFound
	}

	return nil
}

// Upsert inserts the entry or refreshes the source-tracking fields from the
// caller. Columns that capture a reviewer's or an agent's verdict -- flags,
// flag_reasons, decision, decision_note, decided_by, decided_at -- are
// intentionally absent from the ON CONFLICT DO UPDATE SET clause, so an
// existing row's verdict survives every subsequent source poll untouched.
// Those columns are written on the initial INSERT (new row) and can only be
// changed afterwards through AccessReviewEntry.Update.
func (e *AccessReviewEntry) Upsert(
	ctx context.Context,
	conn pg.Tx,
	scope Scoper,
) error {
	q := `
INSERT INTO access_review_entries (
    id,
    tenant_id,
    organization_id,
    access_review_campaign_id,
    access_review_campaign_source_id,
    identity_id,
    email,
    full_name,
    roles,
    job_title,
    is_admin,
    mfa_status,
    auth_method,
    account_type,
    active,
    last_login,
    account_created_at,
    external_id,
    account_key,
    incremental_tag,
    flags,
    flag_reasons,
    decision,
    decision_note,
    decided_by,
    decided_at,
    created_at,
    updated_at
) VALUES (
    @id,
    @tenant_id,
    @organization_id,
    @access_review_campaign_id,
    @access_review_campaign_source_id,
    @identity_id,
    @email,
    @full_name,
    COALESCE(@roles, '{}'::TEXT[]),
    @job_title,
    @is_admin,
    @mfa_status,
    @auth_method,
    @account_type,
    COALESCE(@active, TRUE),
    @last_login,
    @account_created_at,
    @external_id,
    @account_key,
    @incremental_tag,
    @flags,
    @flag_reasons,
    @decision,
    @decision_note,
    @decided_by,
    @decided_at,
    @created_at,
    @updated_at
)
ON CONFLICT (access_review_campaign_source_id, account_key) DO UPDATE SET
    email              = EXCLUDED.email,
    full_name          = EXCLUDED.full_name,
    roles               = EXCLUDED.roles,
    job_title          = EXCLUDED.job_title,
    is_admin           = EXCLUDED.is_admin,
    mfa_status         = EXCLUDED.mfa_status,
    auth_method        = EXCLUDED.auth_method,
    account_type       = EXCLUDED.account_type,
    active             = EXCLUDED.active,
    last_login         = EXCLUDED.last_login,
    account_created_at = EXCLUDED.account_created_at,
    external_id        = EXCLUDED.external_id,
    incremental_tag    = EXCLUDED.incremental_tag,
    updated_at         = EXCLUDED.updated_at
`

	args := pgx.StrictNamedArgs{
		"id":                               e.ID,
		"tenant_id":                        scope.GetTenantID(),
		"organization_id":                  e.OrganizationID,
		"access_review_campaign_id":        e.AccessReviewCampaignID,
		"access_review_campaign_source_id": e.AccessReviewCampaignSourceID,
		"identity_id":                      e.IdentityID,
		"email":                            e.Email,
		"full_name":                        e.FullName,
		"roles":                            e.Roles,
		"job_title":                        e.JobTitle,
		"is_admin":                         e.IsAdmin,
		"mfa_status":                       e.MFAStatus,
		"auth_method":                      e.AuthMethod,
		"account_type":                     e.AccountType,
		"active":                           e.Active,
		"last_login":                       e.LastLogin,
		"account_created_at":               e.AccountCreatedAt,
		"external_id":                      e.ExternalID,
		"account_key":                      e.AccountKey,
		"incremental_tag":                  e.IncrementalTag,
		"flags":                            e.Flags,
		"flag_reasons":                     e.FlagReasons,
		"decision":                         e.Decision,
		"decision_note":                    e.DecisionNote,
		"decided_by":                       e.DecidedBy,
		"decided_at":                       e.DecidedAt,
		"created_at":                       e.CreatedAt,
		"updated_at":                       e.UpdatedAt,
	}

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

	return nil
}

// BaselineAccountEntry holds minimal data from a previous campaign's entries
// for incremental diffing.
type BaselineAccountEntry struct {
	AccountKey string
	Email      string
	FullName   string
}

func (entries *AccessReviewEntries) LoadBaselineBySourceID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	campaignID gid.GID,
	sourceID gid.GID,
) ([]BaselineAccountEntry, error) {
	q := fmt.Sprintf(`
SELECT account_key, email, full_name
FROM access_review_entries
WHERE %s
  AND access_review_campaign_source_id IN (
    SELECT id
    FROM access_review_campaign_sources
    WHERE access_review_campaign_id = @campaign_id
      AND access_review_source_id = @source_id
  )
`, scope.SQLFragment())

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

	rows, err := conn.Query(ctx, q, args)
	if err != nil {
		return nil, fmt.Errorf("cannot load baseline entries: %w", err)
	}
	defer rows.Close()

	var result []BaselineAccountEntry

	for rows.Next() {
		var entry BaselineAccountEntry
		if err := rows.Scan(&entry.AccountKey, &entry.Email, &entry.FullName); err != nil {
			return nil, fmt.Errorf("cannot scan baseline entry: %w", err)
		}

		result = append(result, entry)
	}

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

	return result, nil
}

// LoadMembershipAccountsByOrganizationID loads IAM membership accounts for the
// given organization.
type MembershipAccount struct {
	ID        gid.GID
	Email     string
	FullName  string
	State     string
	Role      string
	CreatedAt time.Time
}

func LoadMembershipAccountsByOrganizationID(
	ctx context.Context,
	conn pg.Querier,
	scope Scoper,
	organizationID gid.GID,
) ([]MembershipAccount, error) {
	q := `
SELECT
    m.id,
    i.email_address,
    i.full_name,
    m.state,
    m.role,
    m.created_at
FROM
    iam_memberships m
JOIN
    identities i ON i.id = m.identity_id
WHERE
    m.%s
    AND m.organization_id = @organization_id
    AND m.state = 'ACTIVE'
ORDER BY
    i.email_address ASC
`
	q = fmt.Sprintf(q, scope.SQLFragment())

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

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

	var result []MembershipAccount

	for rows.Next() {
		var account MembershipAccount
		if err := rows.Scan(&account.ID, &account.Email, &account.FullName, &account.State, &account.Role, &account.CreatedAt); err != nil {
			return nil, fmt.Errorf("cannot scan membership account: %w", err)
		}

		result = append(result, account)
	}

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

	return result, nil
}