package db

import "time"

// User is an account. With auth deferred, the app runs as a single hardcoded
// `local` user (see LocalUserID); the user_id columns and this type exist so
// real auth can drop in later without a schema migration.
type User struct {
	ID          string    `json:"id"`
	Email       string    `json:"email"`
	DisplayName string    `json:"display_name"`
	CreatedAt   time.Time `json:"created_at"`
}

// Document is a single piece of writing. `Content` is the Tiptap JSON document
// (source of truth for the editor); `ContentText` is the flattened plain text
// kept in sync on every save and fed to the LLM.
type Document struct {
	ID          string    `json:"id"`
	UserID      string    `json:"user_id"`
	Title       string    `json:"title"`
	Content     string    `json:"content"`      // Tiptap JSON
	ContentText string    `json:"content_text"` // plain text for the LLM
	Tone        string    `json:"tone"`         // target writing tone; steers LLM advice
	WordCount   int       `json:"word_count"`
	CreatedAt   time.Time `json:"created_at"`
	UpdatedAt   time.Time `json:"updated_at"`
}

// DocumentVersion is a point-in-time snapshot of a document's body, captured so
// a writer can recover from a bad edit or an unwanted change. `Content` mirrors
// the document's Tiptap JSON at snapshot time; `Kind` records why it was taken
// (see the kind constants). List responses omit the heavy Content/ContentText
// fields (the `omitempty`-friendly zero strings) and load them only on preview
// or restore.
type DocumentVersion struct {
	ID          string    `json:"id"`
	DocID       string    `json:"doc_id"`
	Title       string    `json:"title"`
	Content     string    `json:"content,omitempty"`      // Tiptap JSON; omitted in list view
	ContentText string    `json:"content_text,omitempty"` // plain text; omitted in list view
	WordCount   int       `json:"word_count"`
	Kind        string    `json:"kind"` // auto | manual | pre_restore
	CreatedAt   time.Time `json:"created_at"`
}

// Document version kinds, mirrored from the schema CHECK constraint.
const (
	VersionKindAuto       = "auto"        // throttled background snapshot on save
	VersionKindManual     = "manual"      // explicit "save a restore point"
	VersionKindPreRestore = "pre_restore" // safety copy taken just before a restore
)

// Tag is a user-scoped label for organizing documents. `Color` is a palette key
// (rose, mint, peach, lavender, sky, honey) the frontend maps to a CSS color;
// storing the key (not a hex value) keeps tags in step with the design tokens.
// `DocCount` is populated only by the tag-list endpoint (how many documents wear
// the tag); it's omitted from per-document tag lists.
type Tag struct {
	ID       string `json:"id"`
	Name     string `json:"name"`
	Color    string `json:"color"`
	DocCount int    `json:"doc_count,omitempty"`
}

// Tag color palette keys, mirrored on the frontend. Kept small and aligned with
// the existing design tokens; unknown values fall back to rose client-side.
const (
	TagColorRose     = "rose"
	TagColorMint     = "mint"
	TagColorPeach    = "peach"
	TagColorLavender = "lavender"
	TagColorSky      = "sky"
	TagColorHoney    = "honey"
)

// Suggestion is a single LLM-proposed edit anchored to a span of the document.
//
// FromPos/ToPos are plaintext offsets into ContentText for server-side use only;
// the frontend re-anchors by matching the `Original` string in ProseMirror
// coordinates at render time (spec Note #6). `Replacement` is empty for `voice`
// flags — those are awareness-only, with no correction to apply.
type Suggestion struct {
	ID          string    `json:"id"`
	DocID       string    `json:"doc_id"`
	FromPos     int       `json:"from_pos"`
	ToPos       int       `json:"to_pos"`
	Original    string    `json:"original"`
	Replacement string    `json:"replacement"`
	Explanation string    `json:"explanation"`
	Type        string    `json:"type"`   // grammar | phrasing | idiom | clarity | voice | collocation
	Status      string    `json:"status"` // pending | accepted | rejected
	CreatedAt   time.Time `json:"created_at"`
}

// Suggestion type and status values, mirrored from the schema CHECK constraints.
const (
	SuggestionTypeGrammar     = "grammar"
	SuggestionTypePhrasing    = "phrasing"
	SuggestionTypeIdiom       = "idiom"
	SuggestionTypeClarity     = "clarity"
	SuggestionTypeVoice       = "voice"
	SuggestionTypeCollocation = "collocation"

	SuggestionStatusPending  = "pending"
	SuggestionStatusAccepted = "accepted"
	SuggestionStatusRejected = "rejected"
)