package repository

import (
	"context"
	"errors"
	"fmt"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"

	"github.com/geo-platform/tenant-api/internal/ops/domain"
)

var ErrDesktopClientReleaseNotFound = errors.New("desktop client release not found")

type DesktopClientReleaseRepository struct {
	pool *pgxpool.Pool
}

func NewDesktopClientReleaseRepository(pool *pgxpool.Pool) *DesktopClientReleaseRepository {
	return &DesktopClientReleaseRepository{pool: pool}
}

const desktopClientReleaseColumns = `
	id, platform, arch, channel, version, min_supported_version, download_source,
	oss_object_key, custom_download_url, file_name, file_size_bytes, sha256,
	updater_download_source, updater_oss_object_key, updater_custom_download_url,
	updater_file_name, updater_file_size_bytes, updater_sha256,
	release_notes, force_update, enabled, published_at, created_by, updated_by,
	created_at, updated_at`

type DesktopClientReleaseFilter struct {
	Keyword  string
	Platform string
	Channel  string
	Enabled  *bool
	Limit    int
	Offset   int
}

type DesktopClientReleaseTarget struct {
	Platform string
	Arch     string
	Channel  string
}

type UpsertDesktopClientReleaseInput struct {
	Platform                 string
	Arch                     string
	Channel                  string
	Version                  string
	MinSupportedVersion      *string
	DownloadSource           string
	OSSObjectKey             *string
	CustomDownloadURL        *string
	FileName                 *string
	FileSizeBytes            *int64
	SHA256                   *string
	UpdaterDownloadSource    *string
	UpdaterOSSObjectKey      *string
	UpdaterCustomDownloadURL *string
	UpdaterFileName          *string
	UpdaterFileSizeBytes     *int64
	UpdaterSHA256            *string
	ReleaseNotes             *string
	ForceUpdate              bool
	Enabled                  bool
	PublishedAtNow           bool
	ActorID                  *int64
}

func scanDesktopClientRelease(row pgx.Row) (*domain.DesktopClientRelease, error) {
	var item domain.DesktopClientRelease
	err := row.Scan(
		&item.ID,
		&item.Platform,
		&item.Arch,
		&item.Channel,
		&item.Version,
		&item.MinSupportedVersion,
		&item.DownloadSource,
		&item.OSSObjectKey,
		&item.CustomDownloadURL,
		&item.FileName,
		&item.FileSizeBytes,
		&item.SHA256,
		&item.UpdaterDownloadSource,
		&item.UpdaterOSSObjectKey,
		&item.UpdaterCustomDownloadURL,
		&item.UpdaterFileName,
		&item.UpdaterFileSizeBytes,
		&item.UpdaterSHA256,
		&item.ReleaseNotes,
		&item.ForceUpdate,
		&item.Enabled,
		&item.PublishedAt,
		&item.CreatedBy,
		&item.UpdatedBy,
		&item.CreatedAt,
		&item.UpdatedAt,
	)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, ErrDesktopClientReleaseNotFound
		}
		return nil, err
	}
	return &item, nil
}

func (r *DesktopClientReleaseRepository) List(ctx context.Context, f DesktopClientReleaseFilter) ([]domain.DesktopClientRelease, int64, error) {
	args := []any{}
	where := "1=1"

	if f.Keyword != "" {
		args = append(args, "%"+f.Keyword+"%")
		where += fmt.Sprintf(
			" AND (version ILIKE $%d OR platform ILIKE $%d OR arch ILIKE $%d OR channel ILIKE $%d OR COALESCE(file_name, '') ILIKE $%d OR COALESCE(oss_object_key, '') ILIKE $%d OR COALESCE(custom_download_url, '') ILIKE $%d OR COALESCE(updater_file_name, '') ILIKE $%d OR COALESCE(updater_oss_object_key, '') ILIKE $%d OR COALESCE(updater_custom_download_url, '') ILIKE $%d)",
			len(args), len(args), len(args), len(args), len(args), len(args), len(args), len(args), len(args), len(args),
		)
	}
	if f.Platform != "" {
		args = append(args, f.Platform)
		where += fmt.Sprintf(" AND platform = $%d", len(args))
	}
	if f.Channel != "" {
		args = append(args, f.Channel)
		where += fmt.Sprintf(" AND channel = $%d", len(args))
	}
	if f.Enabled != nil {
		args = append(args, *f.Enabled)
		where += fmt.Sprintf(" AND enabled = $%d", len(args))
	}

	var total int64
	if err := r.pool.QueryRow(ctx, "SELECT COUNT(*) FROM ops.desktop_client_releases WHERE "+where, args...).Scan(&total); err != nil {
		return nil, 0, err
	}

	limit := f.Limit
	if limit <= 0 || limit > 200 {
		limit = 20
	}
	offset := f.Offset
	if offset < 0 {
		offset = 0
	}
	args = append(args, limit, offset)
	limitArg := len(args) - 1
	offsetArg := len(args)

	rows, err := r.pool.Query(ctx, fmt.Sprintf(`
		SELECT %s
		FROM ops.desktop_client_releases
		WHERE %s
		ORDER BY enabled DESC, channel ASC, platform ASC, arch ASC, updated_at DESC, id DESC
		LIMIT $%d OFFSET $%d`, desktopClientReleaseColumns, where, limitArg, offsetArg), args...)
	if err != nil {
		return nil, 0, err
	}
	defer rows.Close()

	items := make([]domain.DesktopClientRelease, 0, limit)
	for rows.Next() {
		item, scanErr := scanDesktopClientRelease(rows)
		if scanErr != nil {
			return nil, 0, scanErr
		}
		items = append(items, *item)
	}
	return items, total, rows.Err()
}

func (r *DesktopClientReleaseRepository) GetByID(ctx context.Context, id int64) (*domain.DesktopClientRelease, error) {
	return scanDesktopClientRelease(r.pool.QueryRow(ctx, `
		SELECT `+desktopClientReleaseColumns+`
		FROM ops.desktop_client_releases
		WHERE id = $1`, id))
}

func (r *DesktopClientReleaseRepository) GetByTarget(ctx context.Context, target DesktopClientReleaseTarget) (*domain.DesktopClientRelease, error) {
	return scanDesktopClientRelease(r.pool.QueryRow(ctx, `
		SELECT `+desktopClientReleaseColumns+`
		FROM ops.desktop_client_releases
		WHERE platform = $1 AND arch = $2 AND channel = $3`,
		target.Platform, target.Arch, target.Channel))
}

func (r *DesktopClientReleaseRepository) FindEnabled(ctx context.Context, target DesktopClientReleaseTarget) (*domain.DesktopClientRelease, error) {
	return scanDesktopClientRelease(r.pool.QueryRow(ctx, `
		SELECT `+desktopClientReleaseColumns+`
		FROM ops.desktop_client_releases
		WHERE platform = $1
		  AND channel = $2
		  AND enabled = TRUE
		  AND (arch = $3 OR arch = 'universal')
		ORDER BY CASE WHEN arch = $3 THEN 0 ELSE 1 END, updated_at DESC, id DESC
		LIMIT 1`,
		target.Platform, target.Channel, target.Arch))
}

func (r *DesktopClientReleaseRepository) ListEnabledByTarget(ctx context.Context, target DesktopClientReleaseTarget) ([]domain.DesktopClientRelease, error) {
	rows, err := r.pool.Query(ctx, `
		SELECT `+desktopClientReleaseColumns+`
		FROM ops.desktop_client_releases
		WHERE platform = $1
		  AND channel = $2
		  AND enabled = TRUE
		  AND (arch = $3 OR arch = 'universal')
		ORDER BY CASE WHEN arch = $3 THEN 0 ELSE 1 END, updated_at DESC, id DESC`,
		target.Platform, target.Channel, target.Arch)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	items := []domain.DesktopClientRelease{}
	for rows.Next() {
		item, scanErr := scanDesktopClientRelease(rows)
		if scanErr != nil {
			return nil, scanErr
		}
		items = append(items, *item)
	}
	return items, rows.Err()
}

func (r *DesktopClientReleaseRepository) ListEnabledByChannel(ctx context.Context, channel string) ([]domain.DesktopClientRelease, error) {
	rows, err := r.pool.Query(ctx, `
		SELECT `+desktopClientReleaseColumns+`
		FROM ops.desktop_client_releases
		WHERE channel = $1
		  AND enabled = TRUE
		ORDER BY channel ASC, platform ASC, arch ASC, updated_at DESC, id DESC`,
		channel)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	items := []domain.DesktopClientRelease{}
	for rows.Next() {
		item, scanErr := scanDesktopClientRelease(rows)
		if scanErr != nil {
			return nil, scanErr
		}
		items = append(items, *item)
	}
	return items, rows.Err()
}

func (r *DesktopClientReleaseRepository) Create(ctx context.Context, in UpsertDesktopClientReleaseInput) (*domain.DesktopClientRelease, error) {
	return scanDesktopClientRelease(r.pool.QueryRow(ctx, `
		INSERT INTO ops.desktop_client_releases (
			platform, arch, channel, version, min_supported_version, download_source,
			oss_object_key, custom_download_url, file_name, file_size_bytes, sha256,
			updater_download_source, updater_oss_object_key, updater_custom_download_url,
			updater_file_name, updater_file_size_bytes, updater_sha256,
			release_notes, force_update, enabled, published_at, created_by, updated_by
		)
		VALUES (
			$1, $2, $3, $4, $5, $6,
			$7, $8, $9, $10, $11,
			$12, $13, $14, $15, $16, $17,
			$18, $19, $20,
			CASE WHEN $21 THEN NOW() ELSE NULL END,
			$22, $22
		)
		RETURNING `+desktopClientReleaseColumns,
		in.Platform, in.Arch, in.Channel, in.Version, in.MinSupportedVersion, in.DownloadSource,
		in.OSSObjectKey, in.CustomDownloadURL, in.FileName, in.FileSizeBytes, in.SHA256,
		in.UpdaterDownloadSource, in.UpdaterOSSObjectKey, in.UpdaterCustomDownloadURL,
		in.UpdaterFileName, in.UpdaterFileSizeBytes, in.UpdaterSHA256,
		in.ReleaseNotes, in.ForceUpdate, in.Enabled, in.PublishedAtNow, in.ActorID))
}

func (r *DesktopClientReleaseRepository) Update(ctx context.Context, id int64, in UpsertDesktopClientReleaseInput) (*domain.DesktopClientRelease, error) {
	return scanDesktopClientRelease(r.pool.QueryRow(ctx, `
		UPDATE ops.desktop_client_releases
		SET platform = $1,
		    arch = $2,
		    channel = $3,
		    version = $4,
		    min_supported_version = $5,
		    download_source = $6,
		    oss_object_key = $7,
		    custom_download_url = $8,
		    file_name = $9,
		    file_size_bytes = $10,
		    sha256 = $11,
		    updater_download_source = $12,
		    updater_oss_object_key = $13,
		    updater_custom_download_url = $14,
		    updater_file_name = $15,
		    updater_file_size_bytes = $16,
		    updater_sha256 = $17,
		    release_notes = $18,
		    force_update = $19,
		    enabled = $20,
		    published_at = CASE
		        WHEN $20 = TRUE AND published_at IS NULL THEN NOW()
		        WHEN $20 = FALSE THEN NULL
		        ELSE published_at
		    END,
		    updated_by = $21,
		    updated_at = NOW()
		WHERE id = $22
		RETURNING `+desktopClientReleaseColumns,
		in.Platform, in.Arch, in.Channel, in.Version, in.MinSupportedVersion, in.DownloadSource,
		in.OSSObjectKey, in.CustomDownloadURL, in.FileName, in.FileSizeBytes, in.SHA256,
		in.UpdaterDownloadSource, in.UpdaterOSSObjectKey, in.UpdaterCustomDownloadURL,
		in.UpdaterFileName, in.UpdaterFileSizeBytes, in.UpdaterSHA256,
		in.ReleaseNotes, in.ForceUpdate, in.Enabled, in.ActorID, id))
}

func (r *DesktopClientReleaseRepository) SetEnabled(ctx context.Context, id int64, enabled bool, actorID *int64) (*domain.DesktopClientRelease, error) {
	return scanDesktopClientRelease(r.pool.QueryRow(ctx, `
		UPDATE ops.desktop_client_releases
		SET enabled = $1,
		    published_at = CASE
		        WHEN $1 = TRUE AND published_at IS NULL THEN NOW()
		        WHEN $1 = FALSE THEN NULL
		        ELSE published_at
		    END,
		    updated_by = $2,
		    updated_at = NOW()
		WHERE id = $3
		RETURNING `+desktopClientReleaseColumns, enabled, actorID, id))
}

func (r *DesktopClientReleaseRepository) Delete(ctx context.Context, id int64) error {
	cmd, err := r.pool.Exec(ctx, `DELETE FROM ops.desktop_client_releases WHERE id = $1`, id)
	if err != nil {
		return err
	}
	if cmd.RowsAffected() == 0 {
		return ErrDesktopClientReleaseNotFound
	}
	return nil
}