package context

import (
	"github.com/jesseduffield/lazygit/pkg/gocui"
	"github.com/jesseduffield/lazygit/pkg/gui/types"
)

type BaseContext struct {
	kind            types.ContextKind
	key             types.ContextKey
	view            *gocui.View
	viewTrait       types.IViewTrait
	windowName      string
	onGetOptionsMap func() map[string]string

	keybindingsFns           []types.KeybindingsFn
	mouseKeybindingsFns      []types.MouseKeybindingsFn
	onDoubleClickFn          func() error
	onClickFn                func(opts gocui.ViewMouseBindingOpts) error
	onClickFocusedMainViewFn onClickFocusedMainViewFn
	onRenderToMainFn         func()
	onFocusFns               []onFocusFn
	onFocusLostFns           []onFocusLostFn
	onQuitFns                []func()

	focusable                   bool
	transient                   bool
	hasControlledBounds         bool
	needsRerenderOnWidthChange  types.NeedsRerenderOnWidthChangeLevel
	needsRerenderOnHeightChange bool
	highlightOnFocus            bool

	*ParentContextMgr
}

type (
	onFocusFn                = func(types.OnFocusOpts)
	onFocusLostFn            = func(types.OnFocusLostOpts)
	onClickFocusedMainViewFn = func(mainViewName string, clickedLineIdx int) error
)

var _ types.IBaseContext = &BaseContext{}

type NewBaseContextOpts struct {
	Kind                        types.ContextKind
	Key                         types.ContextKey
	View                        *gocui.View
	WindowName                  string
	Focusable                   bool
	Transient                   bool
	HasUncontrolledBounds       bool // negating for the sake of making false the default
	HighlightOnFocus            bool
	NeedsRerenderOnWidthChange  types.NeedsRerenderOnWidthChangeLevel
	NeedsRerenderOnHeightChange bool

	OnGetOptionsMap func() map[string]string
}

func NewBaseContext(opts NewBaseContextOpts) *BaseContext {
	viewTrait := NewViewTrait(opts.View)

	hasControlledBounds := !opts.HasUncontrolledBounds

	return &BaseContext{
		kind:                        opts.Kind,
		key:                         opts.Key,
		view:                        opts.View,
		windowName:                  opts.WindowName,
		onGetOptionsMap:             opts.OnGetOptionsMap,
		focusable:                   opts.Focusable,
		transient:                   opts.Transient,
		hasControlledBounds:         hasControlledBounds,
		highlightOnFocus:            opts.HighlightOnFocus,
		needsRerenderOnWidthChange:  opts.NeedsRerenderOnWidthChange,
		needsRerenderOnHeightChange: opts.NeedsRerenderOnHeightChange,
		ParentContextMgr:            &ParentContextMgr{},
		viewTrait:                   viewTrait,
	}
}

func (self *BaseContext) GetOptionsMap() map[string]string {
	if self.onGetOptionsMap != nil {
		return self.onGetOptionsMap()
	}
	return nil
}

func (self *BaseContext) SetWindowName(windowName string) {
	self.windowName = windowName
}

func (self *BaseContext) GetWindowName() string {
	return self.windowName
}

func (self *BaseContext) GetViewName() string {
	// for the sake of the global context which has no view
	if self.view == nil {
		return ""
	}

	return self.view.Name()
}

func (self *BaseContext) GetView() *gocui.View {
	return self.view
}

func (self *BaseContext) GetViewTrait() types.IViewTrait {
	return self.viewTrait
}

func (self *BaseContext) GetKind() types.ContextKind {
	return self.kind
}

func (self *BaseContext) GetKey() types.ContextKey {
	return self.key
}

func (self *BaseContext) GetKeybindings(opts types.KeybindingsOpts) []*types.Binding {
	bindings := []*types.Binding{}
	for i := range self.keybindingsFns {
		// the first binding in the bindings array takes precedence but we want the
		// last keybindingsFn to take precedence to we add them in reverse
		bindings = append(bindings, self.keybindingsFns[len(self.keybindingsFns)-1-i](opts)...)
	}

	return bindings
}

func (self *BaseContext) AddKeybindingsFn(fn types.KeybindingsFn) {
	self.keybindingsFns = append(self.keybindingsFns, fn)
}

func (self *BaseContext) AddMouseKeybindingsFn(fn types.MouseKeybindingsFn) {
	self.mouseKeybindingsFns = append(self.mouseKeybindingsFns, fn)
}

func (self *BaseContext) ClearAllAttachedControllerFunctions() {
	self.keybindingsFns = nil
	self.mouseKeybindingsFns = nil
	self.onFocusFns = nil
	self.onFocusLostFns = nil
	self.onQuitFns = nil
	self.onDoubleClickFn = nil
	self.onClickFn = nil
	self.onClickFocusedMainViewFn = nil
	self.onRenderToMainFn = nil
}

func (self *BaseContext) AddOnDoubleClickFn(fn func() error) {
	if fn != nil {
		if self.onDoubleClickFn != nil {
			panic("only one controller is allowed to set an onDoubleClickFn")
		}
		self.onDoubleClickFn = fn
	}
}

func (self *BaseContext) AddOnClickFn(fn func(opts gocui.ViewMouseBindingOpts) error) {
	if fn != nil {
		if self.onClickFn != nil {
			panic("only one controller is allowed to set an onClickFn")
		}
		self.onClickFn = fn
	}
}

func (self *BaseContext) AddOnClickFocusedMainViewFn(fn onClickFocusedMainViewFn) {
	if fn != nil {
		if self.onClickFocusedMainViewFn != nil {
			panic("only one controller is allowed to set an onClickFocusedMainViewFn")
		}
		self.onClickFocusedMainViewFn = fn
	}
}

func (self *BaseContext) GetOnDoubleClick() func() error {
	return self.onDoubleClickFn
}

func (self *BaseContext) GetOnClick() func(opts gocui.ViewMouseBindingOpts) error {
	return self.onClickFn
}

func (self *BaseContext) GetOnClickFocusedMainView() onClickFocusedMainViewFn {
	return self.onClickFocusedMainViewFn
}

func (self *BaseContext) AddOnRenderToMainFn(fn func()) {
	if fn != nil {
		if self.onRenderToMainFn != nil {
			panic("only one controller is allowed to set an onRenderToMainFn")
		}
		self.onRenderToMainFn = fn
	}
}

func (self *BaseContext) AddOnFocusFn(fn onFocusFn) {
	if fn != nil {
		self.onFocusFns = append(self.onFocusFns, fn)
	}
}

func (self *BaseContext) AddOnFocusLostFn(fn onFocusLostFn) {
	if fn != nil {
		self.onFocusLostFns = append(self.onFocusLostFns, fn)
	}
}

func (self *BaseContext) AddOnQuitFn(fn func()) {
	if fn != nil {
		self.onQuitFns = append(self.onQuitFns, fn)
	}
}

func (self *BaseContext) GetMouseKeybindings(opts types.KeybindingsOpts) []*gocui.ViewMouseBinding {
	bindings := []*gocui.ViewMouseBinding{}
	for i := range self.mouseKeybindingsFns {
		// the first binding in the bindings array takes precedence but we want the
		// last keybindingsFn to take precedence to we add them in reverse
		bindings = append(bindings, self.mouseKeybindingsFns[len(self.mouseKeybindingsFns)-1-i](opts)...)
	}

	return bindings
}

func (self *BaseContext) IsFocusable() bool {
	return self.focusable
}

func (self *BaseContext) IsTransient() bool {
	return self.transient
}

func (self *BaseContext) HasControlledBounds() bool {
	return self.hasControlledBounds
}

func (self *BaseContext) NeedsRerenderOnWidthChange() types.NeedsRerenderOnWidthChangeLevel {
	return self.needsRerenderOnWidthChange
}

func (self *BaseContext) NeedsRerenderOnHeightChange() bool {
	return self.needsRerenderOnHeightChange
}

func (self *BaseContext) Title() string {
	return ""
}

func (self *BaseContext) TotalContentHeight() int {
	return self.view.ViewLinesHeight()
}
