package web

import (
	"time"

	"gardomatic.kleiax.de/lib/client"
)

// templateData is the internal builder used by handlers. pageView projects it
// to the feature sets explicitly available to a particular page template.
type templateData struct {
	commonTemplateData
	accountTemplateData
	adminTemplateData
	gardenTemplateData
	plantTemplateData
	speciesTemplateData
	locationTemplateData
	taskTemplateData
	journalTemplateData
	mediaTemplateData
	searchTemplateData
}

// CommonTemplateData contains values available to every rendered page.
type CommonTemplateData struct {
	CurrentYear      int
	ErrorStatus      int
	ErrorTitle       string
	ErrorMessage     string
	ContentKind      string
	Form             any
	Flash            string
	IsAuthenticated  bool
	IsActivated      bool
	CSRFToken        string
	CurrentUser      *client.User
	Garden           *client.Garden
	Filters          map[string]string
	Pagination       *paginationData
	TagSuggestions   []string
	UseJournalEditor bool
	Health           *client.Health
	HealthError      string
	SystemTime       time.Time
	WebVersion       string
}

// AccountTemplateData contains account-management page data.
type AccountTemplateData struct {
	AccountSessions  []client.AccountSession
	AccountProtected bool
}

// AdminTemplateData contains application-administration page data.
type AdminTemplateData struct {
	AdminUsers             []client.User
	ApplicationRoles       []client.Role
	GardenRoles            []client.Role
	GardenRoleSettings     []client.GardenRoleSetting
	ApplicationPermissions []permissionOption
	GardenPermissions      []permissionOption
	RoleEditors            []roleEditorData
	ApplicationSettings    *client.ApplicationSettings
	SpeciesCategories      []client.SpeciesCategory
	TaskPriorities         []client.TaskPriority
	EnvironmentVariables   []client.EnvironmentVariable
}

// GardenTemplateData contains garden membership and invitation page data.
type GardenTemplateData struct {
	Gardens []client.Garden
	Members []client.GardenMember
	Invites []client.GardenInvite
}

// PlantTemplateData contains plant, placement, and plant-task page data.
type PlantTemplateData struct {
	Plants           []client.Plant
	PlantTasks       []plantTaskForm
	TaskDialogNew    bool
	PlantID          int
	PlantCreatedBy   int
	PlantLocations   map[int][]client.PlantLocation
	PendingPlantName string
}

// SpeciesTemplateData contains species, care, and task-template page data.
type SpeciesTemplateData struct {
	Species           []client.Species
	TaskTemplates     map[int][]client.SpeciesTaskTemplate
	TemplateOptOuts   map[int]bool
	TemplateID        int
	SpeciesID         int
	SpeciesGlobal     bool
	TemplateSpeciesID int
	CareInstructions  []client.CareInstruction
	WizardStep        string
}

// LocationTemplateData contains location hierarchy and occupancy page data.
type LocationTemplateData struct {
	Locations         []client.Location
	LocationID        int
	LocationCreatedBy int
	LocationPlants    []locationPlant
	LocationHistory   []locationPlantHistory
	LocationTree      []locationNode
	LocationNames     map[int]string
}

// TaskTemplateData contains task-list and calendar page data.
type TaskTemplateData struct {
	TaskYears     []int
	Tasks         []client.Task
	TaskID        int
	TaskCreatedBy int
	CalendarDays  []calendarDay
	CalendarStart time.Time
	CalendarEnd   time.Time
	CalendarView  string
	PreviousDate  string
	NextDate      string
}

// JournalTemplateData contains journal and pinboard page data.
type JournalTemplateData struct {
	JournalEntries  []client.JournalEntry
	PinboardEntries []client.JournalEntry
	JournalEntry    *client.JournalEntry
	EntryID         int
}

// MediaTemplateData contains reusable garden image-library page data.
type MediaTemplateData struct {
	Images     []client.Image
	PhotoCount int
}

// SearchTemplateData contains cross-resource search results.
type SearchTemplateData struct{ Search searchResults }

// Private aliases keep handler construction concise while the actual embedded
// projection types remain visible to html/template's reflection logic.
type commonTemplateData = CommonTemplateData
type accountTemplateData = AccountTemplateData
type adminTemplateData = AdminTemplateData
type gardenTemplateData = GardenTemplateData
type plantTemplateData = PlantTemplateData
type speciesTemplateData = SpeciesTemplateData
type locationTemplateData = LocationTemplateData
type taskTemplateData = TaskTemplateData
type journalTemplateData = JournalTemplateData
type mediaTemplateData = MediaTemplateData
type searchTemplateData = SearchTemplateData

type calendarDay struct {
	Date  time.Time
	Tasks []client.Task
}

type searchResults struct {
	Query     string
	Mode      string
	Month     int
	MonthName string
	Year      int
	Years     []int
	All       []searchCard
	Tasks     []searchCard
	Plants    []searchCard
	Tags      []searchCard
	Species   []searchCard
	Journal   []searchCard
	Pinboard  []searchCard
}

type searchCard struct {
	Title  string
	Detail string
	Meta   string
	Type   string
	URL    string
}

type locationPlant struct {
	Plant      client.Plant
	Assignment client.PlantLocation
}

type locationPlantHistory struct {
	Year   int
	Plants []locationPlant
}

type permissionOption struct {
	Name  string
	Label string
}

func (data *templateData) pageView(page string) any {
	switch page {
	case "activate.tmpl", "email_confirm.tmpl", "error.tmpl", "healthcheck.tmpl", "home.tmpl", "invite.tmpl", "privacy.tmpl", "settings.tmpl", "signin.tmpl":
		return struct{ CommonTemplateData }{data.commonTemplateData}
	case "account.tmpl":
		return struct {
			CommonTemplateData
			AccountTemplateData
		}{data.commonTemplateData, data.accountTemplateData}
	case "admin.tmpl":
		return struct {
			CommonTemplateData
			AdminTemplateData
		}{data.commonTemplateData, data.adminTemplateData}
	case "garden_form.tmpl":
		return struct {
			CommonTemplateData
			AdminTemplateData
			GardenTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.adminTemplateData, data.gardenTemplateData, data.mediaTemplateData}
	case "garden_new.tmpl":
		return struct {
			CommonTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.mediaTemplateData}
	case "gardens.tmpl":
		return struct {
			CommonTemplateData
			GardenTemplateData
		}{data.commonTemplateData, data.gardenTemplateData}
	case "dashboard.tmpl":
		return struct {
			CommonTemplateData
			PlantTemplateData
			LocationTemplateData
			TaskTemplateData
			JournalTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.plantTemplateData, data.locationTemplateData, data.taskTemplateData, data.journalTemplateData, data.mediaTemplateData}
	case "images.tmpl":
		return struct {
			CommonTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.mediaTemplateData}
	case "journal.tmpl":
		return struct {
			CommonTemplateData
			JournalTemplateData
		}{data.commonTemplateData, data.journalTemplateData}
	case "journal_form.tmpl":
		return struct {
			CommonTemplateData
			JournalTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.journalTemplateData, data.mediaTemplateData}
	case "location_form.tmpl":
		return struct {
			CommonTemplateData
			LocationTemplateData
			PlantTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.locationTemplateData, data.plantTemplateData, data.mediaTemplateData}
	case "locations.tmpl":
		return struct {
			CommonTemplateData
			LocationTemplateData
		}{data.commonTemplateData, data.locationTemplateData}
	case "plant.tmpl":
		return struct {
			CommonTemplateData
			PlantTemplateData
			SpeciesTemplateData
			LocationTemplateData
		}{data.commonTemplateData, data.plantTemplateData, data.speciesTemplateData, data.locationTemplateData}
	case "plant_form.tmpl":
		return struct {
			CommonTemplateData
			AdminTemplateData
			PlantTemplateData
			SpeciesTemplateData
			LocationTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.adminTemplateData, data.plantTemplateData, data.speciesTemplateData, data.locationTemplateData, data.mediaTemplateData}
	case "plant_location_form.tmpl":
		return struct {
			CommonTemplateData
			PlantTemplateData
			LocationTemplateData
		}{data.commonTemplateData, data.plantTemplateData, data.locationTemplateData}
	case "search.tmpl":
		return struct {
			CommonTemplateData
			SearchTemplateData
		}{data.commonTemplateData, data.searchTemplateData}
	case "species.tmpl":
		return struct {
			CommonTemplateData
			SpeciesTemplateData
		}{data.commonTemplateData, data.speciesTemplateData}
	case "species_form.tmpl":
		return struct {
			CommonTemplateData
			AdminTemplateData
			SpeciesTemplateData
			MediaTemplateData
		}{data.commonTemplateData, data.adminTemplateData, data.speciesTemplateData, data.mediaTemplateData}
	case "task_calendar.tmpl":
		return struct {
			CommonTemplateData
			TaskTemplateData
		}{data.commonTemplateData, data.taskTemplateData}
	case "task_form.tmpl", "tasks.tmpl":
		return struct {
			CommonTemplateData
			AdminTemplateData
			PlantTemplateData
			LocationTemplateData
			TaskTemplateData
		}{data.commonTemplateData, data.adminTemplateData, data.plantTemplateData, data.locationTemplateData, data.taskTemplateData}
	case "task_template_form.tmpl":
		return struct {
			CommonTemplateData
			AdminTemplateData
			SpeciesTemplateData
		}{data.commonTemplateData, data.adminTemplateData, data.speciesTemplateData}
	default:
		panic("missing page data projection for " + page)
	}
}