package app

import (
	"github.com/datarhei/core/v16/process"
)

type ConfigIOCleanup struct {
	Pattern       string `json:"pattern"`
	MaxFiles      uint   `json:"max_files"`
	MaxFileAge    uint   `json:"max_file_age_seconds"`
	PurgeOnDelete bool   `json:"purge_on_delete"`
}

type ConfigIO struct {
	ID      string            `json:"id"`
	Address string            `json:"address"`
	Options []string          `json:"options"`
	Cleanup []ConfigIOCleanup `json:"cleanup"`
}

// ConfigWebRTC carries per-process WebRTC egress settings.
//
// When Enabled is true the restream manager will (via the app/webrtc
// subsystem) append an additional FFmpeg output leg that emits H.264/Opus
// RTP to a loopback UDP port the subsystem allocates. The subsystem reads
// that RTP and fans it out to WHEP subscribers.
type ConfigWebRTC struct {
	Enabled        bool   `json:"enabled"`
	VideoPT        uint8  `json:"video_pt"`
	AudioPT        uint8  `json:"audio_pt"`
	ForceTranscode bool   `json:"force_transcode"`

	// VideoMap / AudioMap select which input stream the WebRTC RTP
	// legs draw from. Defaults are "0:v:0" and "0:a:0" — correct for
	// any RTMP / SRT publisher (single input, both A and V on input
	// 0). For multi-input pipelines (lavfi test sources, SDI capture
	// fed alongside file audio, etc.) the operator can override.
	VideoMap string `json:"video_map,omitempty"`
	AudioMap string `json:"audio_map,omitempty"`
}

// Clone returns a deep copy of the WebRTC config (currently a value copy;
// provided for symmetry with other Clone methods and future-proofing).
func (w ConfigWebRTC) Clone() ConfigWebRTC { return w }

// ConfigWHIPIngest carries per-process WHIP ingest settings.
//
// When Enabled is true the app/webrtc subsystem will, at process start,
// allocate two adjacent loopback UDP ports and prepend them as RTP input
// legs to the FFmpeg command. A browser or OBS publisher then connects
// to POST /api/v3/whip/{id} and the received WebRTC tracks are forwarded
// to those ports, giving FFmpeg its video+audio input via WebRTC.
//
// Flow (symmetric to WHEP egress):
//   browser → WHIP → Pion → UDP → FFmpeg input → FFmpeg outputs (RTMP/SRT/HLS…)
//
// VideoPT / AudioPT are the RTP payload types Pion will stamp on forwarded
// packets. Defaults match the WHEP egress defaults (102/111).
type ConfigWHIPIngest struct {
	Enabled bool  `json:"enabled"`
	VideoPT uint8 `json:"video_pt"`
	AudioPT uint8 `json:"audio_pt"`
}

// Clone returns a value copy of the WHIP ingest config.
func (w ConfigWHIPIngest) Clone() ConfigWHIPIngest { return w }

func (io ConfigIO) Clone() ConfigIO {
	clone := ConfigIO{
		ID:      io.ID,
		Address: io.Address,
	}

	clone.Options = make([]string, len(io.Options))
	copy(clone.Options, io.Options)

	clone.Cleanup = make([]ConfigIOCleanup, len(io.Cleanup))
	copy(clone.Cleanup, io.Cleanup)

	return clone
}

type Config struct {
	ID             string          `json:"id"`
	Reference      string          `json:"reference"`
	FFVersion      string          `json:"ffversion"`
	Input          []ConfigIO      `json:"input"`
	Output         []ConfigIO      `json:"output"`
	Options        []string        `json:"options"`
	Reconnect      bool            `json:"reconnect"`
	ReconnectDelay uint64          `json:"reconnect_delay_seconds"` // seconds
	Autostart      bool            `json:"autostart"`
	StaleTimeout   uint64          `json:"stale_timeout_seconds"` // seconds
	LimitCPU       float64         `json:"limit_cpu_usage"`       // percent
	LimitMemory    uint64          `json:"limit_memory_bytes"`    // bytes
	LimitWaitFor   uint64          `json:"limit_waitfor_seconds"` // seconds
	WebRTC         ConfigWebRTC    `json:"webrtc"`
	WHIPIngest     ConfigWHIPIngest `json:"whip_ingest,omitempty"`
}

func (config *Config) Clone() *Config {
	clone := &Config{
		ID:             config.ID,
		Reference:      config.Reference,
		FFVersion:      config.FFVersion,
		Reconnect:      config.Reconnect,
		ReconnectDelay: config.ReconnectDelay,
		Autostart:      config.Autostart,
		StaleTimeout:   config.StaleTimeout,
		LimitCPU:       config.LimitCPU,
		LimitMemory:    config.LimitMemory,
		LimitWaitFor:   config.LimitWaitFor,
		WebRTC:         config.WebRTC.Clone(),
		WHIPIngest:     config.WHIPIngest.Clone(),
	}

	clone.Input = make([]ConfigIO, len(config.Input))
	for i, io := range config.Input {
		clone.Input[i] = io.Clone()
	}

	clone.Output = make([]ConfigIO, len(config.Output))
	for i, io := range config.Output {
		clone.Output[i] = io.Clone()
	}

	clone.Options = make([]string, len(config.Options))
	copy(clone.Options, config.Options)

	return clone
}

// CreateCommand created the FFmpeg command from this config.
func (config *Config) CreateCommand() []string {
	var command []string

	// Copy global options
	command = append(command, config.Options...)

	for _, input := range config.Input {
		// Add the resolved input to the process command
		command = append(command, input.Options...)
		command = append(command, "-i", input.Address)
	}

	for _, output := range config.Output {
		// Add the resolved output to the process command
		command = append(command, output.Options...)
		command = append(command, output.Address)
	}

	return command
}

type Process struct {
	ID        string  `json:"id"`
	Reference string  `json:"reference"`
	Config    *Config `json:"config"`
	CreatedAt int64   `json:"created_at"`
	UpdatedAt int64   `json:"updated_at"`
	Order     string  `json:"order"`
}

func (process *Process) Clone() *Process {
	clone := &Process{
		ID:        process.ID,
		Reference: process.Reference,
		Config:    process.Config.Clone(),
		CreatedAt: process.CreatedAt,
		UpdatedAt: process.UpdatedAt,
		Order:     process.Order,
	}

	return clone
}

type ProcessStates struct {
	Finished  uint64
	Starting  uint64
	Running   uint64
	Finishing uint64
	Failed    uint64
	Killed    uint64
}

func (p *ProcessStates) Marshal(s process.States) {
	p.Finished = s.Finished
	p.Starting = s.Starting
	p.Running = s.Running
	p.Finishing = s.Finishing
	p.Failed = s.Failed
	p.Killed = s.Killed
}

type State struct {
	Order     string        // Current order, e.g. "start", "stop"
	State     string        // Current state, e.g. "running"
	States    ProcessStates // Cumulated process states
	Time      int64         // Unix timestamp of last status change
	Duration  float64       // Runtime in seconds since last status change
	Reconnect float64       // Seconds until next reconnect, negative if not reconnecting
	LastLog   string        // Last recorded line from the process
	Progress  Progress      // Progress data of the process
	Memory    uint64        // Current memory consumption in bytes
	CPU       float64       // Current CPU consumption in percent
	Command   []string      // ffmpeg command line parameters
}