package api

import (
	"context"
	"encoding/json"
	"net/http"

	"git.golem15.com/golem15/sm-seo-plugin/classes"
	"git.golem15.com/golem15/sm-seo-plugin/models"
	"gorm.io/gorm"
)

// UpdateSettingsInput is the body of PUT /_seo/api/v1/settings: only the
// fields sent change.
type UpdateSettingsInput struct {
	SiteName           *string                             `json:"site_name,omitempty" jsonschema:"the site name (%site% in templates)"`
	TwitterSite        *string                             `json:"twitter_site,omitempty" jsonschema:"the site's X/Twitter handle"`
	TitleTemplate      *string                             `json:"title_template,omitempty" jsonschema:"the title template: %title%, %description% and %site%"`
	HomeTemplate       *string                             `json:"home_template,omitempty" jsonschema:"the home page title template"`
	DefaultDescription *string                             `json:"default_description,omitempty" jsonschema:"the description of pages without one"`
	DefaultOGImage     *string                             `json:"default_og_image,omitempty" jsonschema:"the social image of pages without one"`
	QueryParams        *[]models.QueryParam                `json:"query_params,omitempty" jsonschema:"the query parameter list: name (a trailing * matches a prefix), kind content, filter or tracking, and an optional path pattern"`
	NoindexPaths       *string                             `json:"noindex_paths,omitempty" jsonschema:"path patterns never indexed, one per line"`
	SearchPaths        *string                             `json:"search_paths,omitempty" jsonschema:"search result path patterns (noindex,follow), one per line"`
	URLHost            *string                             `json:"url_host,omitempty" jsonschema:"keep, www or bare"`
	URLSlash           *string                             `json:"url_slash,omitempty" jsonschema:"keep, add or remove a trailing slash"`
	URLLowercase       *bool                               `json:"url_lowercase,omitempty" jsonschema:"lowercase the ASCII letters of addresses"`
	VerifyGoogle       *string                             `json:"verify_google,omitempty" jsonschema:"the Google Search Console verification code"`
	VerifyBing         *string                             `json:"verify_bing,omitempty" jsonschema:"the Bing verification code"`
	VerifyYandex       *string                             `json:"verify_yandex,omitempty" jsonschema:"the Yandex verification code"`
	VerifyOther        *[]models.VerifyMeta                `json:"verify_other,omitempty" jsonschema:"other verification meta tags (name, content)"`
	VerifyFiles        *[]models.VerifyFile                `json:"verify_files,omitempty" jsonschema:"verification files served from the site root (filename, body)"`
	CSVDelimiter       *string                             `json:"csv_delimiter,omitempty" jsonschema:"the import and export delimiter: , or ;"`
	Types              map[string]classes.TypeSettingWrite `json:"types,omitempty" jsonschema:"per content type key: inject (show the SEO tab), title_template, description_template, robots"`
}

// settingsJSON is the settings in an answer: the values and, per content
// type, its label and settings.
func settingsJSON(ctx context.Context, svc *classes.Service, db *gorm.DB, row models.Settings) (map[string]any, error) {
	stored, err := classes.LoadTypeSettings(db)
	if err != nil {
		return nil, err
	}
	types := map[string]any{}
	if reg := svc.Registry(); reg != nil {
		for _, typ := range reg.ContentTypes() {
			ts, ok := stored[typ.Key]
			if !ok {
				ts = models.DefaultTypeSetting(typ.Key)
			}
			v := classes.TypeSettingValues(ts)
			v["label"] = svc.PhraseCtx(ctx, typ.Label, nil)
			types[typ.Key] = v
		}
	}
	return map[string]any{"settings": classes.SettingsValues(row), "types": types}, nil
}

// ShowSettings serves GET /_seo/api/v1/settings.
func ShowSettings(service func() *classes.Service) http.HandlerFunc {
	return manage(service, func(ctx context.Context, svc *classes.Service, r *http.Request) (int, any, error) {
		db, err := read(ctx, svc)
		if err != nil {
			return 0, nil, err
		}
		row, err := classes.LoadSettings(db)
		if err != nil {
			return 0, nil, err
		}
		body, err := settingsJSON(ctx, svc, db, row)
		if err != nil {
			return 0, nil, err
		}
		return http.StatusOK, map[string]any{"data": body}, nil
	})
}

// UpdateSettings serves PUT /_seo/api/v1/settings: the fields sent change,
// with the checks of the settings screen; 422 validation_failed names the
// refused fields.
func UpdateSettings(service func() *classes.Service) http.HandlerFunc {
	return manage(service, func(ctx context.Context, svc *classes.Service, r *http.Request) (int, any, error) {
		raw := map[string]json.RawMessage{}
		if err := decode(r, maxBody, &raw); err != nil {
			return 0, nil, err
		}
		in := classes.SettingsWrite{Values: map[string]any{}}
		for key, value := range raw {
			if key == "types" {
				if err := json.Unmarshal(value, &in.Types); err != nil {
					return 0, nil, Fail(http.StatusUnprocessableEntity, errInvalidBody)
				}
				continue
			}
			var v any
			if err := json.Unmarshal(value, &v); err != nil {
				return 0, nil, Fail(http.StatusUnprocessableEntity, errInvalidBody)
			}
			in.Values[key] = v
		}
		var row models.Settings
		err := write(ctx, svc, func(ctx context.Context, tx *gorm.DB) error {
			var err error
			row, err = svc.SaveSettings(ctx, tx, in)
			return err
		})
		if err != nil {
			return 0, nil, err
		}
		db, err := read(ctx, svc)
		if err != nil {
			return 0, nil, err
		}
		body, err := settingsJSON(ctx, svc, db, row)
		if err != nil {
			return 0, nil, err
		}
		return http.StatusOK, map[string]any{"data": body}, nil
	})
}