package docs

import (
	"encoding/json"

	"bookhoard/internal/database"
	"bookhoard/internal/handlers"
	"bookhoard/internal/services"
)

// Schema pins the machine-checkable contract for one route. The drift gate
// (drift_test.go) validates every frontmatter'd doc against the entry for its
// "METHOD path" key.
//
// MAINTENANCE CONTRACT: every doc with frontmatter MUST have a registry
// entry, and every new/changed route that ships a frontmatter'd doc updates
// its entry in the same commit. The gate fails loudly on a missing entry —
// that is the discipline, not an inconvenience.
//
// Request: the struct the handler Binds into (nil for bodyless routes).
//   - example-request is decoded with unknown fields DISALLOWED (typo guard)
//   - fields whose validate tag contains "required" must appear in the
//     example (staleness guard)
//
// Response: what the handler passes to c.JSON.
//   - struct / slice of struct: marshaled and its TOP-LEVEL key set compared
//     against example-response in both directions
//   - json.RawMessage: hand-built map responses pin their key set as a
//     sample; promote to a struct when the endpoint is next touched
//   - zero value (Schema{}): no JSON body expected (e.g. 204) — the doc must
//     not carry an example-response block
type Schema struct {
	Request  any
	Response any
}

// Schemas is keyed by "METHOD path" in Echo syntax. Sample values inside
// RawMessage pins use empty strings / zero values — only the KEY SET is
// checked, never the values.
var Schemas = map[string]Schema{
	// --- collections (pilot area) ---
	"POST /api/collections": {
		Request: handlers.CreateCollectionRequest{},
		Response: json.RawMessage(`{
			"id": "", "user_id": "", "name": "", "description": "",
			"color": "", "icon": "", "collection_type": "",
			"auto_assign_rules": null, "view_settings": {},
			"book_count": 0, "created_at": ""
		}`),
	},
	"GET /api/collections": {
		Response: struct {
			Collections []handlers.CollectionSummary `json:"collections"`
			Total       int                          `json:"total"`
		}{},
	},
	"GET /api/collections/:id": {
		Response: json.RawMessage(`{
			"id": "", "user_id": "", "name": "", "description": "",
			"color": "", "icon": "", "auto_assign_rules": null,
			"view_settings": {}, "books": [], "book_count": 0,
			"is_smart": false, "up_next": [], "created_at": ""
		}`),
	},
	"PUT /api/collections/:id": {
		Request: handlers.UpdateCollectionRequest{},
		Response: json.RawMessage(`{
			"id": "", "user_id": "", "name": "", "description": "",
			"color": "", "icon": "", "auto_assign_rules": null,
			"view_settings": {}, "created_at": ""
		}`),
	},
	"DELETE /api/collections/:id": {},
	// --- devices (batch 1) ---
	"GET /api/devices/:id": {
		Response: handlers.DeviceInfo{},
	},
	"PUT /api/devices/:id/regenerate-token": {
		Response: json.RawMessage(`{
			"message": "", "auth_token": "",
			"device": {
				"id": "", "device_name": "", "device_type": "",
				"last_sync": null, "last_seen": null,
				"sync_enabled": false, "auto_sync": false,
				"sync_frequency_minutes": 0, "created_at": "",
				"device_metadata": null, "auth_token": ""
			},
			"sync_urls": {}
		}`),
	},
	"GET /api/devices/:id/collections": {
		Response: struct {
			DeviceID string                          `json:"device_id"`
			Mappings []handlers.DeviceMappingSummary `json:"mappings"`
			Total    int                             `json:"total"`
		}{},
	},
	"PUT /api/devices/:id/collections/:collectionId": {
		Request: handlers.UpdateDeviceMappingRequest{},
		Response: json.RawMessage(`{
			"id": "", "collection_id": "", "device_id": "",
			"device_shelf_name": "", "sync_direction": "", "created_at": ""
		}`),
	},
	"GET /api/devices/:id/sidecar/download": {
		Response: json.RawMessage(`{
			"version": "", "bookhoard": {}, "books": {},
			"collections": [], "opds_enabled": false,
			"sidecar_enabled": false, "last_updated": ""
		}`),
	},
	"POST /api/devices/:deviceId/sync/link-book": {
		Request: services.LinkBookRequest{},
		Response: json.RawMessage(`{
			"status": "",
			"device_file_alias": {
				"id": "", "media_item_id": "", "device_id": "",
				"file_path": "", "file_sha256": "",
				"confidence_score": 0.0
			}
		}`),
	},

	// --- libraries (batch 2) ---
	"GET /api/libraries/types": {
		Response: []database.LibraryTypes{},
	},
	"GET /api/libraries": {
		Response: struct {
			Data []database.ListLibrariesRow `json:"data"`
		}{},
	},
	"GET /api/libraries/:id/folders": {
		Response: []database.LibraryFolders{},
	},
	"GET /api/libraries/:id/issues/list": {
		Response: []handlers.ProcessingIssueResponse{},
	},
	"GET /api/libraries/:id/issues/stats": {
		Response: handlers.ProcessingIssueStats{},
	},
	"POST /api/libraries/:id/issues/:issueId/:mediaItemId/resolve": {
		Response: json.RawMessage(`{"success": false, "message": ""}`),
	},
	"DELETE /api/libraries/:id/issues/:issueId": {
		Response: json.RawMessage(`{"success": false, "message": ""}`),
	},
	"POST /api/libraries/:id/scan": {
		Request:  nil, // library_id injected from the path; no body used
		Response: json.RawMessage(`{"message": "", "job_id": "", "status": ""}`),
	},
	"GET /api/libraries/scan-settings": {
		Response: handlers.ScanSettingsResponse{},
	},
	"PUT /api/libraries/scan-settings": {
		Request: handlers.UpdateScanSettingsRequest{},
		// RawMessage pin (not the struct): the update handler ALWAYS sets
		// Message, but the struct's omitempty would drop it from a
		// zero-value marshal and the gate would reject correct docs.
		Response: json.RawMessage(`{
			"scan_poll_interval_seconds": 0,
			"auto_scan_enabled": false,
			"message": ""
		}`),
	},

	// --- media-items batch 3a: reader-adjacent CRUD ---
	"GET /api/media-items/:id/bookmarks": {
		Response: []database.MediaBookmarks{},
	},
	"POST /api/media-items/:id/bookmarks": {
		Request:  handlers.CreateMediaBookmarkRequest{},
		Response: database.MediaBookmarks{},
	},
	"PUT /api/media-items/:id/bookmarks/:bookmarkId": {
		Request:  handlers.UpdateMediaBookmarkRequest{},
		Response: database.MediaBookmarks{},
	},
	"DELETE /api/media-items/:id/bookmarks/:bookmarkId": {},
	// Review: the upsert binds an inline anonymous struct {review}; pinned
	// by RawMessage. Empty review string = delete, returns {"review": null}.
	"POST /api/media-items/:id/review": {
		Request:  json.RawMessage(`{"review": ""}`),
		Response: database.MediaReviews{},
	},
	"PUT /api/media-items/:id/review": {
		Request:  json.RawMessage(`{"review": ""}`),
		Response: database.MediaReviews{},
	},
	"GET /api/media-items/:id/review": {
		Response: database.MediaReviews{},
	},
	"DELETE /api/media-items/:id/review": {
		Response: json.RawMessage(`{"message": ""}`),
	},
	"GET /api/media-items/:id/notes/:noteId": {
		Response: database.MediaNotes{},
	},
	"GET /api/media-items/:id/highlights/:highlightId": {
		Response: database.MediaHighlights{},
	},
	"POST /api/media-items/:id/annotations/:annotationId/restore": {
		Request:  nil, // kind via ?annotation_type= or optional body
		Response: json.RawMessage(`{"restored": false}`),
	},
	"DELETE /api/media-items/:id/annotations/:annotationId": {
		Request:  nil, // kind via required ?annotation_type=
		Response: json.RawMessage(`{"purged": false}`),
	},
}